GMAB 6-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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​ FORM 6-K

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REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE MONTH OF APRIL 2025

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COMMISSION FILE NUMBER 001-38976

Genmab A/S
(Exact name of Registrant as specified in its charter)

Carl Jacobsens Vej 30

2500 Valby

Denmark

+45 70 20 27 28
(Address of principal executive offices)

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Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ⌧ Form 40-F ◻

This report on Form 6-K shall be deemed to be incorporated by reference in Genmab A/S’s registration statements on Form S-8 (File No. 333-232693, 333-253519, 333-262970, 333-277273 and 333-284876) and to be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

nthony	​	​
​	GENMAB A/S
​	​	​
​	BY:	/s/ Anthony Pagano
​	​	Name: Anthony Pagano
​	​	Title: Executive Vice President & Chief Financial Officer

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DATE: APRIL 7, 2025

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EXHIBIT INDEX

O
Exhibit	Description of Exhibit
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99.1	Company Announcement Dated April 7, 2025: Transactions in Connection with Share Buy-back Program
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99.1(a)	Appendix Share buyback program – Specification for March 31 – April 2, 2024
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99.1(b)	Appendix Share buyback program – Specification for April 3 – April 4, 2024

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Exhibit 99.1

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Transactions In Connection with Share Buy-back Program

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Company Announcement

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COPENHAGEN, Denmark; April 7, 2025 – Genmab A/S (Nasdaq: GMAB). On March 25, 2025, Genmab announced the initiation of a share buy-back program to repurchase up to 2.2 million shares to reduce capital and to honor our commitments under the Restricted Stock Unit program. The share buy-back program is expected to be completed no later than July 10, 2025.

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The following transactions were executed under the program from March 31 to April 4, 2025:

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	Trading Platform		No. of shares	Average price (DKK)	Total value (DKK)
Accumulated through last announcement		​	233,556	​	319,971,942.97
March 31, 2025		XCSE	49,478	1,342.63	​
​		BCXE	25,000	1,342.85	​
​		AQEU	3,596	1,342.79	​
​		TQEX	5,000	1,342.87	​
​		Total	83,074	​	111,544,914.00
April 1, 2025		XCSE	50,906	1,308.77	​
		BCXE	25,500	1,308.62	​
​		AQEU	2,911	1,307.66	​
​		TQEX	4,755	1,307.89	​
​		Total	84,072	​	110,019,427.00
April 2, 2025		XCSE	51,447	1,278.28	​
​		BCXE	25,320	1,277.95	​
​		AQEU	4,674	1,277.41	​
​		TQEX	4,965	1,278.17	​
​		Total	86,406	​	110,438,006.00
April 3, 2025		XCSE	51,162	1,283.49	​
​		BCXE	26,200	1,283.62	​
​		AQEU	4,600	1,283.38	​
​		TQEX	5,069	1,283.57	​
​		Total	87,031	​	111,706,673.00
April 4, 2025		XCSE	36,698	1,277.18	​
​		BCXE	18,346	1,276.76	​
​		AQEU	1,606	1,277.99	​
​		TQEX	5,300	1,270.68	​
​		Total	61,950	​	79,080,513.00
Total		​	402,533	​	522,789,533.00
Accumulated under the program		​	636,089	​	842,761,476.00

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Details of each transaction are included as an appendix to this announcement.

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​	​	​
Genmab A/S	Tel: +45 7020 2728	Company Announcement no. 17
Carl Jacobsens Vej 30	Fax: +45 7020 2729	Page 1/2
2500 Valby, Denmark	www.genmab.com	CVR no. 2102 3884
​	​	LEI Code 529900MTJPDPE4MHJ122

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Transactions In Connection with Share Buy-back Program
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Following these transactions, Genmab holds 3,165,695 shares as treasury shares, corresponding to 4.78% of the total share capital and voting rights.

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The share buy-back program is undertaken in accordance with Regulation (EU) No. 596/2014 (‘MAR’) and the Commission Delegated Regulation (EU) 2016/1052, also referred to as the “Safe Harbour Regulation.” Further details on the terms of the share buy-back program can be found in our company announcement no. 14 dated March 25, 2025.

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About Genmab

Genmab is an international biotechnology company with a core purpose of guiding its unstoppable team to strive toward improving the lives of patients with innovative and differentiated antibody therapeutics. For more than 25 years, its passionate, innovative and collaborative team has invented next-generation antibody technology platforms and leveraged translational, quantitative and data sciences, resulting in a proprietary pipeline including bispecific T-cell engagers, antibody-drug conjugates, next-generation immune checkpoint modulators and effector function-enhanced antibodies. By 2030, Genmab’s vision is to transform the lives of people with cancer and other serious diseases with knock-your-socks-off (KYSO) antibody medicines^®^.

Established in 1999, Genmab is headquartered in Copenhagen, Denmark, with international presence across North America, Europe and Asia Pacific. For more information, please visit Genmab.com and follow us on LinkedIn and X.

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Contact:
Marisol Peron, Senior Vice President, Global Communications & Corporate Affairs

T: +1 609 524 0065; E: [email protected]

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Andrew Carlsen, Vice President, Head of Investor Relations

T: +45 3377 9558; E: [email protected]

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This Company Announcement contains forward looking statements. The words “believe,” “expect,” “anticipate,” “intend” and “plan” and similar expressions identify forward looking statements. Actual results or performance may differ materially from any future results or performance expressed or implied by such statements. The important factors that could cause our actual results or performance to differ materially include, among others, risks associated with pre-clinical and clinical development of products, uncertainties related to the outcome and conduct of clinical trials including unforeseen safety issues, uncertainties related to product manufacturing, the lack of market acceptance of our products, our inability to manage growth, the competitive environment in relation to our business area and markets, our inability to attract and retain suitably qualified personnel, the unenforceability or lack of protection of our patents and proprietary rights, our relationships with affiliated entities, changes and developments in technology which may render our products or technologies obsolete, and other factors. For a further discussion of these risks, please refer to the risk management sections in Genmab’s most recent financial reports, which are available on www.genmab.com and the risk factors included in Genmab’s most recent Annual Report on Form 20-F and other filings with the U.S. Securities and Exchange Commission (SEC), which are available at www.sec.gov. Genmab does not undertake any obligation to update or revise forward looking statements in this Company Announcement nor to confirm such statements to reflect subsequent events or circumstances after the date made or in relation to actual results, unless required by law.

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Genmab A/S and/or its subsidiaries own the following trademarks: Genmab^®^; the Y-shaped Genmab logo^®^; Genmab in combination with the Y-shaped Genmab logo^®^; HuMax^®^; DuoBody^®^; HexaBody^®^; DuoHexaBody^®^, HexElect^®^ and KYSO^®^.

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Genmab A/S	Tel: +45 7020 2728	Company Announcement no. 17
Carl Jacobsens Vej 30	Fax: +45 7020 2729	Page 2/2
2500 Valby, Denmark	www.genmab.com	CVR no. 2102 3884
​	​	LEI Code 529900MTJPDPE4MHJ122

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Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

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Issuer	Date	Time CET	Quantity	Price (DKK)	Venue
GENMAB A/S	31-Mar-2025	09:42:24 AM	61	1345.50	TQEX
GENMAB A/S	31-Mar-2025	09:42:24 AM	73	1345.50	CEUX
GENMAB A/S	31-Mar-2025	09:42:25 AM	68	1345.50	XCSE
GENMAB A/S	31-Mar-2025	09:42:25 AM	72	1345.00	AQEU
GENMAB A/S	31-Mar-2025	09:42:44 AM	64	1344.50	XCSE
GENMAB A/S	31-Mar-2025	09:42:44 AM	71	1344.50	TQEX
GENMAB A/S	31-Mar-2025	09:42:44 AM	68	1344.50	CEUX
GENMAB A/S	31-Mar-2025	09:42:46 AM	72	1343.50	XCSE
GENMAB A/S	31-Mar-2025	09:42:46 AM	11	1343.50	TQEX
GENMAB A/S	31-Mar-2025	09:42:46 AM	67	1343.50	CEUX
GENMAB A/S	31-Mar-2025	09:42:51 AM	63	1343.50	TQEX
GENMAB A/S	31-Mar-2025	09:44:45 AM	43	1348.00	XCSE
GENMAB A/S	31-Mar-2025	09:45:27 AM	14	1347.50	CEUX
GENMAB A/S	31-Mar-2025	09:45:27 AM	41	1347.50	CEUX
GENMAB A/S	31-Mar-2025	09:45:38 AM	39	1347.00	XCSE
GENMAB A/S	31-Mar-2025	09:45:47 AM	36	1346.50	CEUX
GENMAB A/S	31-Mar-2025	09:45:47 AM	42	1346.50	AQEU
GENMAB A/S	31-Mar-2025	09:46:23 AM	34	1346.00	XCSE
GENMAB A/S	31-Mar-2025	09:46:45 AM	11	1345.50	CEUX
GENMAB A/S	31-Mar-2025	09:46:45 AM	24	1345.50	CEUX
GENMAB A/S	31-Mar-2025	09:46:45 AM	22	1345.50	AQEU
GENMAB A/S	31-Mar-2025	09:49:19 AM	76	1346.50	XCSE
GENMAB A/S	31-Mar-2025	09:49:19 AM	25	1346.50	AQEU
GENMAB A/S	31-Mar-2025	09:49:36 AM	61	1346.00	CEUX
GENMAB A/S	31-Mar-2025	09:50:25 AM	79	1345.50	XCSE
GENMAB A/S	31-Mar-2025	09:50:25 AM	54	1346.00	CEUX
GENMAB A/S	31-Mar-2025	09:51:29 AM	83	1346.00	XCSE
GENMAB A/S	31-Mar-2025	09:51:29 AM	25	1346.00	CEUX
GENMAB A/S	31-Mar-2025	09:51:29 AM	31	1346.00	CEUX
GENMAB A/S	31-Mar-2025	09:53:50 AM	23	1346.50	AQEU
GENMAB A/S	31-Mar-2025	09:54:10 AM	36	1347.00	CEUX
GENMAB A/S	31-Mar-2025	09:54:10 AM	36	1347.00	CEUX
GENMAB A/S	31-Mar-2025	09:54:11 AM	23	1346.50	AQEU
GENMAB A/S	31-Mar-2025	09:55:37 AM	76	1345.50	XCSE
GENMAB A/S	31-Mar-2025	09:55:37 AM	25	1346.00	CEUX
GENMAB A/S	31-Mar-2025	09:55:37 AM	13	1346.00	CEUX
GENMAB A/S	31-Mar-2025	09:55:45 AM	53	1345.00	CEUX
GENMAB A/S	31-Mar-2025	09:55:48 AM	65	1344.50	XCSE
GENMAB A/S	31-Mar-2025	09:55:48 AM	8	1344.50	XCSE
GENMAB A/S	31-Mar-2025	09:58:21 AM	2	1345.00	XCSE
GENMAB A/S	31-Mar-2025	09:58:27 AM	62	1345.50	CEUX
GENMAB A/S	31-Mar-2025	09:58:46 AM	75	1345.00	XCSE
GENMAB A/S	31-Mar-2025	09:58:46 AM	22	1345.00	TQEX

1

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​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

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GENMAB A/S	31-Mar-2025	09:58:48 AM	3	1344.50	CEUX
GENMAB A/S	31-Mar-2025	09:58:48 AM	54	1344.50	CEUX
GENMAB A/S	31-Mar-2025	10:00:47 AM	30	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:00:47 AM	37	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:01:35 AM	1	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:01:35 AM	21	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:01:35 AM	79	1345.00	XCSE
GENMAB A/S	31-Mar-2025	10:02:43 AM	64	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:03:16 AM	80	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:03:42 AM	46	1343.50	CEUX
GENMAB A/S	31-Mar-2025	10:03:49 AM	83	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:03:49 AM	33	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:03:49 AM	29	1343.00	TQEX
GENMAB A/S	31-Mar-2025	10:04:12 AM	50	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:04:12 AM	22	1343.00	TQEX
GENMAB A/S	31-Mar-2025	10:04:12 AM	50	1343.00	CEUX
GENMAB A/S	31-Mar-2025	10:04:12 AM	19	1343.00	CEUX
GENMAB A/S	31-Mar-2025	10:04:44 AM	81	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:05:10 AM	10	1342.00	CEUX
GENMAB A/S	31-Mar-2025	10:05:39 AM	51	1342.00	CEUX
GENMAB A/S	31-Mar-2025	10:06:25 AM	20	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:06:26 AM	15	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:07:14 AM	6	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:07:14 AM	74	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:07:20 AM	8	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:07:20 AM	5	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:07:20 AM	8	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:07:28 AM	53	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:07:31 AM	25	1342.50	XCSE
GENMAB A/S	31-Mar-2025	10:07:41 AM	43	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:07:41 AM	31	1342.00	TQEX
GENMAB A/S	31-Mar-2025	10:08:07 AM	58	1341.50	CEUX
GENMAB A/S	31-Mar-2025	10:08:13 AM	7	1341.50	CEUX
GENMAB A/S	31-Mar-2025	10:10:40 AM	24	1341.00	XCSE
GENMAB A/S	31-Mar-2025	10:10:40 AM	54	1341.00	XCSE
GENMAB A/S	31-Mar-2025	10:10:49 AM	57	1340.50	CEUX
GENMAB A/S	31-Mar-2025	10:15:26 AM	22	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:15:33 AM	6	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:15:33 AM	52	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:17:26 AM	16	1343.50	CEUX
GENMAB A/S	31-Mar-2025	10:17:55 AM	10	1343.50	CEUX
GENMAB A/S	31-Mar-2025	10:19:29 AM	40	1343.50	TQEX
GENMAB A/S	31-Mar-2025	10:19:29 AM	57	1343.50	CEUX
GENMAB A/S	31-Mar-2025	10:20:12 AM	62	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:20:12 AM	20	1343.00	XCSE

2

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Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

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GENMAB A/S	31-Mar-2025	10:20:12 AM	44	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:12 AM	37	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:12 AM	17	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:12 AM	6	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:19 AM	82	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:20:19 AM	81	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:20:19 AM	37	1342.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:19 AM	30	1342.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:19 AM	15	1342.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:19 AM	22	1342.50	XCSE
GENMAB A/S	31-Mar-2025	10:20:19 AM	62	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:20:42 AM	27	1342.50	TQEX
GENMAB A/S	31-Mar-2025	10:20:42 AM	83	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:21:51 AM	31	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:21:51 AM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:21:51 AM	30	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:21:51 AM	5	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:21:59 AM	1	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:31 AM	79	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:23:31 AM	30	1343.50	TQEX
GENMAB A/S	31-Mar-2025	10:23:31 AM	81	1344.00	CEUX
GENMAB A/S	31-Mar-2025	10:23:34 AM	77	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	16	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	56	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	8	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	44	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	20	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:34 AM	40	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:23:55 AM	81	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:24:02 AM	78	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:24:16 AM	26	1342.50	TQEX
GENMAB A/S	31-Mar-2025	10:24:43 AM	10	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:24:48 AM	3	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:25:11 AM	65	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:26:29 AM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	10:26:29 AM	24	1344.50	CEUX
GENMAB A/S	31-Mar-2025	10:28:00 AM	69	1345.00	XCSE
GENMAB A/S	31-Mar-2025	10:28:00 AM	7	1345.00	XCSE
GENMAB A/S	31-Mar-2025	10:28:00 AM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	10:28:00 AM	2	1345.00	XCSE
GENMAB A/S	31-Mar-2025	10:28:55 AM	26	1345.50	XCSE
GENMAB A/S	31-Mar-2025	10:28:55 AM	7	1345.50	CEUX
GENMAB A/S	31-Mar-2025	10:30:57 AM	22	1347.50	TQEX

3

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	10:30:57 AM	80	1347.50	CEUX
GENMAB A/S	31-Mar-2025	10:32:24 AM	51	1347.00	XCSE
GENMAB A/S	31-Mar-2025	10:32:24 AM	26	1347.00	XCSE
GENMAB A/S	31-Mar-2025	10:32:51 AM	76	1346.50	CEUX
GENMAB A/S	31-Mar-2025	10:32:51 AM	36	1346.50	CEUX
GENMAB A/S	31-Mar-2025	10:33:08 AM	1	1347.00	XCSE
GENMAB A/S	31-Mar-2025	10:33:14 AM	43	1347.00	XCSE
GENMAB A/S	31-Mar-2025	10:33:30 AM	35	1347.00	XCSE
GENMAB A/S	31-Mar-2025	10:34:35 AM	79	1346.50	CEUX
GENMAB A/S	31-Mar-2025	10:35:17 AM	83	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:35:17 AM	26	1346.00	TQEX
GENMAB A/S	31-Mar-2025	10:35:17 AM	36	1346.00	CEUX
GENMAB A/S	31-Mar-2025	10:35:17 AM	5	1346.00	CEUX
GENMAB A/S	31-Mar-2025	10:36:15 AM	82	1345.00	XCSE
GENMAB A/S	31-Mar-2025	10:36:15 AM	30	1345.00	TQEX
GENMAB A/S	31-Mar-2025	10:36:15 AM	83	1345.50	CEUX
GENMAB A/S	31-Mar-2025	10:37:30 AM	35	1344.00	CEUX
GENMAB A/S	31-Mar-2025	10:37:47 AM	42	1344.00	CEUX
GENMAB A/S	31-Mar-2025	10:37:52 AM	45	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:37:52 AM	32	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:43:19 AM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:43:19 AM	17	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:43:19 AM	22	1343.00	TQEX
GENMAB A/S	31-Mar-2025	10:43:19 AM	76	1343.00	CEUX
GENMAB A/S	31-Mar-2025	10:43:23 AM	22	1343.00	AQEU
GENMAB A/S	31-Mar-2025	10:43:36 AM	30	1342.50	XCSE
GENMAB A/S	31-Mar-2025	10:43:52 AM	46	1342.50	XCSE
GENMAB A/S	31-Mar-2025	10:45:15 AM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:45:15 AM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	10:47:02 AM	22	1342.00	TQEX
GENMAB A/S	31-Mar-2025	10:47:02 AM	16	1342.00	CEUX
GENMAB A/S	31-Mar-2025	10:47:02 AM	66	1342.00	CEUX
GENMAB A/S	31-Mar-2025	10:47:28 AM	26	1342.00	AQEU
GENMAB A/S	31-Mar-2025	10:47:33 AM	44	1342.00	XCSE
GENMAB A/S	31-Mar-2025	10:47:56 AM	28	1343.00	XCSE
GENMAB A/S	31-Mar-2025	10:47:58 AM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	10:47:58 AM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	10:48:28 AM	14	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:48:28 AM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	10:50:31 AM	4	1344.50	XCSE
GENMAB A/S	31-Mar-2025	10:50:46 AM	3	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:51:38 AM	1	1345.50	XCSE
GENMAB A/S	31-Mar-2025	10:52:46 AM	11	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:52:46 AM	13	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:52:46 AM	22	1346.00	XCSE

4

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	10:52:46 AM	4	1346.00	CEUX
GENMAB A/S	31-Mar-2025	10:52:46 AM	5	1346.00	CEUX
GENMAB A/S	31-Mar-2025	10:52:46 AM	5	1346.00	CEUX
GENMAB A/S	31-Mar-2025	10:53:16 AM	23	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:53:18 AM	13	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:53:18 AM	11	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:53:18 AM	1	1346.00	XCSE
GENMAB A/S	31-Mar-2025	10:53:18 AM	36	1346.00	CEUX
GENMAB A/S	31-Mar-2025	10:55:05 AM	29	1345.50	TQEX
GENMAB A/S	31-Mar-2025	10:55:05 AM	35	1345.50	CEUX
GENMAB A/S	31-Mar-2025	10:55:05 AM	45	1345.50	CEUX
GENMAB A/S	31-Mar-2025	10:55:51 AM	78	1345.00	XCSE
GENMAB A/S	31-Mar-2025	10:55:55 AM	36	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:30 AM	13	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:32 AM	9	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:32 AM	5	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:33 AM	10	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:56 AM	6	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:57 AM	6	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:57 AM	5	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:56:57 AM	6	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:59:49 AM	23	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:59:49 AM	36	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:59:49 AM	22	1345.00	CEUX
GENMAB A/S	31-Mar-2025	10:59:55 AM	55	1344.00	XCSE
GENMAB A/S	31-Mar-2025	10:59:55 AM	23	1344.50	TQEX
GENMAB A/S	31-Mar-2025	10:59:55 AM	77	1344.50	CEUX
GENMAB A/S	31-Mar-2025	10:59:55 AM	27	1344.50	AQEU
GENMAB A/S	31-Mar-2025	11:03:08 AM	22	1343.50	AQEU
GENMAB A/S	31-Mar-2025	11:03:08 AM	26	1343.50	TQEX
GENMAB A/S	31-Mar-2025	11:03:08 AM	26	1343.50	CEUX
GENMAB A/S	31-Mar-2025	11:03:08 AM	52	1343.50	CEUX
GENMAB A/S	31-Mar-2025	11:03:55 AM	53	1343.00	XCSE
GENMAB A/S	31-Mar-2025	11:03:56 AM	17	1343.00	XCSE
GENMAB A/S	31-Mar-2025	11:03:56 AM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	11:03:56 AM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	11:03:56 AM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	11:03:58 AM	6	1343.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:16 AM	5	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:16 AM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:16 AM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:16 AM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:16 AM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:17 AM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:24 AM	12	1344.00	XCSE

5

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	11:06:40 AM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:06:53 AM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	11:07:01 AM	43	1344.50	XCSE
GENMAB A/S	31-Mar-2025	11:07:01 AM	7	1344.50	XCSE
GENMAB A/S	31-Mar-2025	11:07:01 AM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	11:07:01 AM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	11:07:01 AM	1	1344.50	XCSE
GENMAB A/S	31-Mar-2025	11:09:28 AM	7	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:09:28 AM	38	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:09:28 AM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:09:29 AM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:09:29 AM	38	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:09:29 AM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	81	1344.50	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	6	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	38	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	26	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	13	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:11:12 AM	36	1345.00	CEUX
GENMAB A/S	31-Mar-2025	11:11:12 AM	5	1345.00	CEUX
GENMAB A/S	31-Mar-2025	11:11:12 AM	81	1344.50	CEUX
GENMAB A/S	31-Mar-2025	11:12:20 AM	78	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:12:20 AM	77	1346.00	CEUX
GENMAB A/S	31-Mar-2025	11:12:21 AM	13	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:12:21 AM	11	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:12:21 AM	11	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:12:21 AM	36	1346.00	CEUX
GENMAB A/S	31-Mar-2025	11:12:21 AM	6	1346.00	CEUX
GENMAB A/S	31-Mar-2025	11:12:21 AM	6	1346.00	CEUX
GENMAB A/S	31-Mar-2025	11:13:09 AM	1	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:09 AM	32	1345.50	AQEU
GENMAB A/S	31-Mar-2025	11:13:09 AM	32	1346.00	CEUX
GENMAB A/S	31-Mar-2025	11:13:10 AM	11	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	14	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	30	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	12	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	37	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	1	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	48	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	30	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	12	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	12	1346.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	1	1346.00	XCSE

6

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	11:13:10 AM	77	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	38	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	31	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:10 AM	29	1345.00	TQEX
GENMAB A/S	31-Mar-2025	11:13:10 AM	24	1345.00	CEUX
GENMAB A/S	31-Mar-2025	11:13:10 AM	55	1345.00	CEUX
GENMAB A/S	31-Mar-2025	11:13:11 AM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:11 AM	13	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:11 AM	21	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:12 AM	96	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:13:27 AM	6	1344.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:13 AM	1	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:13 AM	12	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:13 AM	38	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:13 AM	11	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:13 AM	27	1345.00	CEUX
GENMAB A/S	31-Mar-2025	11:14:14 AM	62	1345.00	XCSE
GENMAB A/S	31-Mar-2025	11:14:14 AM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:14 AM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:14 AM	16	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:14 AM	34	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:14 AM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:14 AM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	11:14:14 AM	11	1345.50	CEUX
GENMAB A/S	31-Mar-2025	11:22:27 AM	76	1347.00	XCSE
GENMAB A/S	31-Mar-2025	11:22:27 AM	20	1347.00	XCSE
GENMAB A/S	31-Mar-2025	11:22:27 AM	36	1347.00	AQEU
GENMAB A/S	31-Mar-2025	11:22:27 AM	25	1347.00	CEUX
GENMAB A/S	31-Mar-2025	11:23:02 AM	28	1347.00	XCSE
GENMAB A/S	31-Mar-2025	11:23:02 AM	44	1346.50	TQEX
GENMAB A/S	31-Mar-2025	11:23:02 AM	1	1346.50	CEUX
GENMAB A/S	31-Mar-2025	11:23:02 AM	76	1346.50	CEUX
GENMAB A/S	31-Mar-2025	11:23:02 AM	5	1346.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:35 AM	52	1347.00	XCSE
GENMAB A/S	31-Mar-2025	11:25:38 AM	31	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:38 AM	5	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:38 AM	5	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:38 AM	6	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:39 AM	12	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:39 AM	24	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:39 AM	5	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:39 AM	6	1347.50	CEUX

7

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	11:25:39 AM	8	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:40 AM	36	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:40 AM	5	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:25:59 AM	29	1347.00	XCSE
GENMAB A/S	31-Mar-2025	11:26:00 AM	11	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:26:12 AM	13	1347.50	XCSE
GENMAB A/S	31-Mar-2025	11:26:12 AM	14	1347.50	XCSE
GENMAB A/S	31-Mar-2025	11:26:12 AM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	11:26:12 AM	35	1347.50	XCSE
GENMAB A/S	31-Mar-2025	11:26:12 AM	31	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:26:12 AM	37	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:26:12 AM	26	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:26:12 AM	6	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:26:12 AM	5	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:27:14 AM	13	1347.00	XCSE
GENMAB A/S	31-Mar-2025	11:27:14 AM	11	1347.00	XCSE
GENMAB A/S	31-Mar-2025	11:27:14 AM	42	1347.00	TQEX
GENMAB A/S	31-Mar-2025	11:27:14 AM	79	1347.00	CEUX
GENMAB A/S	31-Mar-2025	11:27:14 AM	30	1347.00	CEUX
GENMAB A/S	31-Mar-2025	11:27:14 AM	6	1347.00	CEUX
GENMAB A/S	31-Mar-2025	11:27:14 AM	5	1347.00	CEUX
GENMAB A/S	31-Mar-2025	11:28:44 AM	50	1348.00	XCSE
GENMAB A/S	31-Mar-2025	11:29:04 AM	2	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:04 AM	9	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:04 AM	9	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:04 AM	5	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:05 AM	15	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:05 AM	5	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:05 AM	6	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:06 AM	5	1349.00	CEUX
GENMAB A/S	31-Mar-2025	11:29:11 AM	15	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:29:11 AM	23	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:30:34 AM	18	1350.50	CEUX
GENMAB A/S	31-Mar-2025	11:30:34 AM	25	1350.50	CEUX
GENMAB A/S	31-Mar-2025	11:31:03 AM	40	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:31:03 AM	1	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:31:03 AM	1	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:31:08 AM	14	1351.50	CEUX
GENMAB A/S	31-Mar-2025	11:31:24 AM	12	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:31:24 AM	24	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:31:24 AM	77	1351.00	CEUX
GENMAB A/S	31-Mar-2025	11:31:58 AM	6	1351.50	CEUX
GENMAB A/S	31-Mar-2025	11:32:37 AM	29	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:32:37 AM	38	1352.50	XCSE
GENMAB A/S	31-Mar-2025	11:32:37 AM	29	1352.50	XCSE

8

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	11:32:37 AM	8	1352.50	XCSE
GENMAB A/S	31-Mar-2025	11:32:37 AM	7	1352.00	CEUX
GENMAB A/S	31-Mar-2025	11:32:37 AM	71	1352.00	CEUX
GENMAB A/S	31-Mar-2025	11:32:37 AM	22	1352.00	CEUX
GENMAB A/S	31-Mar-2025	11:32:38 AM	2	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:32:38 AM	41	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:32:38 AM	9	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	2	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	74	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	45	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	38	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	21	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	36	1350.50	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	12	1350.50	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	29	1350.50	XCSE
GENMAB A/S	31-Mar-2025	11:34:02 AM	42	1351.50	TQEX
GENMAB A/S	31-Mar-2025	11:34:02 AM	79	1352.00	CEUX
GENMAB A/S	31-Mar-2025	11:34:02 AM	78	1351.00	CEUX
GENMAB A/S	31-Mar-2025	11:34:10 AM	31	1350.50	TQEX
GENMAB A/S	31-Mar-2025	11:34:11 AM	9	1350.50	TQEX
GENMAB A/S	31-Mar-2025	11:35:49 AM	30	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	38	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	11	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	25	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	11	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	1	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	13	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	38	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	35	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	11	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	13	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	38	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:49 AM	10	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:50 AM	13	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:50 AM	59	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:35:50 AM	11	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:36:04 AM	55	1351.50	TQEX
GENMAB A/S	31-Mar-2025	11:37:45 AM	35	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:37:45 AM	18	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:37:45 AM	26	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:37:45 AM	1	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:37:45 AM	1	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:39:19 AM	80	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:19 AM	18	1351.00	AQEU
GENMAB A/S	31-Mar-2025	11:39:19 AM	2	1351.00	AQEU

9

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	11:39:19 AM	79	1351.00	CEUX
GENMAB A/S	31-Mar-2025	11:39:53 AM	43	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	38	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	12	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	11	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	22	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	1	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	8	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	22	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	3	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	12	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:53 AM	8	1351.00	AQEU
GENMAB A/S	31-Mar-2025	11:39:54 AM	22	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:39:54 AM	1	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:40:17 AM	43	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:40:17 AM	26	1351.50	XCSE
GENMAB A/S	31-Mar-2025	11:41:01 AM	31	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:41:01 AM	12	1352.00	XCSE
GENMAB A/S	31-Mar-2025	11:41:06 AM	67	1351.50	TQEX
GENMAB A/S	31-Mar-2025	11:42:21 AM	81	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:21 AM	8	1351.00	CEUX
GENMAB A/S	31-Mar-2025	11:42:42 AM	44	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:42 AM	34	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:42 AM	24	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:42 AM	1	1351.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:42 AM	33	1351.00	AQEU
GENMAB A/S	31-Mar-2025	11:42:42 AM	70	1351.00	CEUX
GENMAB A/S	31-Mar-2025	11:42:42 AM	32	1351.00	CEUX
GENMAB A/S	31-Mar-2025	11:42:44 AM	80	1350.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:44 AM	104	1350.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:44 AM	44	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:44 AM	60	1350.50	TQEX
GENMAB A/S	31-Mar-2025	11:42:44 AM	44	1349.50	TQEX
GENMAB A/S	31-Mar-2025	11:42:44 AM	29	1350.00	AQEU
GENMAB A/S	31-Mar-2025	11:42:44 AM	80	1350.00	CEUX
GENMAB A/S	31-Mar-2025	11:42:45 AM	38	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:45 AM	4	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:45 AM	23	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:45 AM	38	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:45 AM	11	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:45 AM	13	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:45 AM	15	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:45 AM	23	1349.00	AQEU
GENMAB A/S	31-Mar-2025	11:42:45 AM	4	1349.00	AQEU
GENMAB A/S	31-Mar-2025	11:42:46 AM	12	1349.00	XCSE

10

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	11:42:46 AM	23	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:46 AM	38	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:46 AM	31	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:46 AM	15	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:46 AM	23	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:46 AM	19	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:46 AM	13	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:42:46 AM	21	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:42:46 AM	9	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:43:00 AM	1	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:43:00 AM	1	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	41	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	13	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	1	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	5	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	12	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	10	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	5	1349.00	XCSE
GENMAB A/S	31-Mar-2025	11:45:04 AM	34	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:45:04 AM	17	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:47:10 AM	6	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:48:27 AM	82	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:49:44 AM	34	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:49:44 AM	38	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:51:47 AM	3	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:51:47 AM	1	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:51:47 AM	20	1348.00	TQEX
GENMAB A/S	31-Mar-2025	11:51:47 AM	11	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:51:48 AM	1	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:52:01 AM	11	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:52:01 AM	11	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:52:58 AM	4	1348.00	TQEX
GENMAB A/S	31-Mar-2025	11:52:58 AM	23	1348.00	AQEU
GENMAB A/S	31-Mar-2025	11:54:49 AM	79	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:54:49 AM	78	1348.50	CEUX
GENMAB A/S	31-Mar-2025	11:54:51 AM	38	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:54:51 AM	12	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:54:51 AM	14	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:54:51 AM	12	1348.50	XCSE
GENMAB A/S	31-Mar-2025	11:54:53 AM	28	1348.00	AQEU
GENMAB A/S	31-Mar-2025	11:55:38 AM	80	1347.50	XCSE
GENMAB A/S	31-Mar-2025	11:55:38 AM	46	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:55:38 AM	31	1347.50	CEUX
GENMAB A/S	31-Mar-2025	11:55:54 AM	30	1347.00	TQEX
GENMAB A/S	31-Mar-2025	11:56:30 AM	77	1346.50	XCSE

11

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	11:56:30 AM	81	1346.50	CEUX
GENMAB A/S	31-Mar-2025	11:56:36 AM	26	1346.50	AQEU
GENMAB A/S	31-Mar-2025	11:57:29 AM	22	1347.00	TQEX
GENMAB A/S	31-Mar-2025	11:58:03 AM	53	1346.50	XCSE
GENMAB A/S	31-Mar-2025	11:58:03 AM	28	1346.50	XCSE
GENMAB A/S	31-Mar-2025	11:58:03 AM	29	1346.50	AQEU
GENMAB A/S	31-Mar-2025	11:58:03 AM	69	1346.50	CEUX
GENMAB A/S	31-Mar-2025	11:58:23 AM	25	1346.00	TQEX
GENMAB A/S	31-Mar-2025	12:00:01 PM	79	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:00:01 PM	29	1346.00	AQEU
GENMAB A/S	31-Mar-2025	12:00:12 PM	12	1347.00	XCSE
GENMAB A/S	31-Mar-2025	12:00:12 PM	22	1347.00	XCSE
GENMAB A/S	31-Mar-2025	12:00:12 PM	12	1347.00	XCSE
GENMAB A/S	31-Mar-2025	12:01:41 PM	78	1346.50	CEUX
GENMAB A/S	31-Mar-2025	12:02:36 PM	44	1347.00	XCSE
GENMAB A/S	31-Mar-2025	12:02:36 PM	11	1347.00	XCSE
GENMAB A/S	31-Mar-2025	12:03:49 PM	80	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:03:49 PM	22	1346.00	AQEU
GENMAB A/S	31-Mar-2025	12:04:06 PM	82	1346.00	CEUX
GENMAB A/S	31-Mar-2025	12:04:16 PM	12	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:04:16 PM	6	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:04:16 PM	4	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:04:16 PM	38	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:05:36 PM	32	1346.50	XCSE
GENMAB A/S	31-Mar-2025	12:05:36 PM	13	1346.50	XCSE
GENMAB A/S	31-Mar-2025	12:05:36 PM	1	1346.50	XCSE
GENMAB A/S	31-Mar-2025	12:05:56 PM	1	1346.50	XCSE
GENMAB A/S	31-Mar-2025	12:06:22 PM	11	1346.50	XCSE
GENMAB A/S	31-Mar-2025	12:06:23 PM	83	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:07:37 PM	64	1345.00	XCSE
GENMAB A/S	31-Mar-2025	12:07:37 PM	32	1345.50	TQEX
GENMAB A/S	31-Mar-2025	12:08:37 PM	1	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:08:37 PM	19	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:08:37 PM	1	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:08:37 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	12:09:19 PM	83	1345.00	CEUX
GENMAB A/S	31-Mar-2025	12:09:31 PM	82	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:09:31 PM	27	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:09:31 PM	15	1343.50	XCSE
GENMAB A/S	31-Mar-2025	12:09:31 PM	30	1343.50	XCSE
GENMAB A/S	31-Mar-2025	12:09:31 PM	34	1343.50	XCSE
GENMAB A/S	31-Mar-2025	12:09:31 PM	29	1344.50	TQEX
GENMAB A/S	31-Mar-2025	12:09:31 PM	8	1345.00	AQEU
GENMAB A/S	31-Mar-2025	12:09:31 PM	15	1345.00	AQEU
GENMAB A/S	31-Mar-2025	12:09:31 PM	24	1343.50	AQEU

12

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	12:09:31 PM	76	1344.00	CEUX
GENMAB A/S	31-Mar-2025	12:09:31 PM	7	1342.50	CEUX
GENMAB A/S	31-Mar-2025	12:09:31 PM	10	1342.50	CEUX
GENMAB A/S	31-Mar-2025	12:10:18 PM	75	1343.50	CEUX
GENMAB A/S	31-Mar-2025	12:11:35 PM	37	1343.00	AQEU
GENMAB A/S	31-Mar-2025	12:12:07 PM	44	1343.00	XCSE
GENMAB A/S	31-Mar-2025	12:12:07 PM	38	1343.00	XCSE
GENMAB A/S	31-Mar-2025	12:12:08 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:03 PM	30	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:03 PM	38	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:03 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:03 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:03 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:37 PM	44	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:37 PM	30	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:37 PM	18	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:15:37 PM	7	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:16:23 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:16:26 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:19:30 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	12:20:29 PM	78	1344.50	XCSE
GENMAB A/S	31-Mar-2025	12:20:29 PM	20	1344.50	CEUX
GENMAB A/S	31-Mar-2025	12:27:37 PM	1	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:27:37 PM	3	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:27:37 PM	2	1345.00	CEUX
GENMAB A/S	31-Mar-2025	12:27:37 PM	77	1345.00	CEUX
GENMAB A/S	31-Mar-2025	12:27:37 PM	28	1345.50	CEUX
GENMAB A/S	31-Mar-2025	12:27:38 PM	13	1345.50	CEUX
GENMAB A/S	31-Mar-2025	12:28:09 PM	56	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:30:15 PM	1	1346.00	XCSE
GENMAB A/S	31-Mar-2025	12:30:15 PM	36	1346.00	CEUX
GENMAB A/S	31-Mar-2025	12:30:47 PM	21	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:30:47 PM	33	1345.50	CEUX
GENMAB A/S	31-Mar-2025	12:30:47 PM	48	1345.50	CEUX
GENMAB A/S	31-Mar-2025	12:30:59 PM	33	1345.50	XCSE
GENMAB A/S	31-Mar-2025	12:30:59 PM	17	1345.00	AQEU
GENMAB A/S	31-Mar-2025	12:31:21 PM	11	1345.50	CEUX
GENMAB A/S	31-Mar-2025	12:31:21 PM	1	1345.50	CEUX
GENMAB A/S	31-Mar-2025	12:31:21 PM	15	1345.50	CEUX
GENMAB A/S	31-Mar-2025	12:32:10 PM	15	1345.00	TQEX
GENMAB A/S	31-Mar-2025	12:32:10 PM	13	1345.00	TQEX
GENMAB A/S	31-Mar-2025	12:32:10 PM	16	1345.00	AQEU
GENMAB A/S	31-Mar-2025	12:32:12 PM	82	1344.50	XCSE
GENMAB A/S	31-Mar-2025	12:32:24 PM	31	1344.00	AQEU
GENMAB A/S	31-Mar-2025	12:32:24 PM	5	1344.00	CEUX

13

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	12:32:59 PM	28	1344.00	TQEX
GENMAB A/S	31-Mar-2025	12:32:59 PM	73	1344.00	CEUX
GENMAB A/S	31-Mar-2025	12:33:27 PM	78	1343.50	XCSE
GENMAB A/S	31-Mar-2025	12:34:09 PM	23	1343.00	TQEX
GENMAB A/S	31-Mar-2025	12:34:14 PM	24	1343.00	AQEU
GENMAB A/S	31-Mar-2025	12:34:14 PM	1	1342.50	CEUX
GENMAB A/S	31-Mar-2025	12:36:46 PM	79	1342.00	XCSE
GENMAB A/S	31-Mar-2025	12:36:46 PM	54	1342.50	CEUX
GENMAB A/S	31-Mar-2025	12:36:56 PM	43	1341.50	XCSE
GENMAB A/S	31-Mar-2025	12:36:56 PM	1	1341.50	XCSE
GENMAB A/S	31-Mar-2025	12:36:56 PM	30	1341.50	XCSE
GENMAB A/S	31-Mar-2025	12:36:56 PM	3	1341.50	XCSE
GENMAB A/S	31-Mar-2025	12:36:56 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	12:36:56 PM	28	1341.50	TQEX
GENMAB A/S	31-Mar-2025	12:37:03 PM	14	1342.50	XCSE
GENMAB A/S	31-Mar-2025	12:37:18 PM	21	1342.50	XCSE
GENMAB A/S	31-Mar-2025	12:37:18 PM	42	1342.50	XCSE
GENMAB A/S	31-Mar-2025	12:37:23 PM	11	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	12:37:34 PM	33	1,342.00	XCSE
GENMAB A/S	31-Mar-2025	12:37:34 PM	30	1,342.00	TQEX
GENMAB A/S	31-Mar-2025	12:37:34 PM	24	1,342.00	AQEU
GENMAB A/S	31-Mar-2025	12:37:34 PM	1	1,342.00	AQEU
GENMAB A/S	31-Mar-2025	12:37:34 PM	77	1,342.00	CEUX
GENMAB A/S	31-Mar-2025	12:39:16 PM	80	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	12:39:16 PM	79	1,341.00	CEUX
GENMAB A/S	31-Mar-2025	12:39:18 PM	77	1,340.00	XCSE
GENMAB A/S	31-Mar-2025	12:40:35 PM	3	1,339.50	CEUX
GENMAB A/S	31-Mar-2025	12:40:35 PM	78	1,339.50	CEUX
GENMAB A/S	31-Mar-2025	12:41:28 PM	5	1,339.00	XCSE
GENMAB A/S	31-Mar-2025	12:41:28 PM	73	1,339.00	XCSE
GENMAB A/S	31-Mar-2025	12:41:28 PM	83	1,338.50	CEUX
GENMAB A/S	31-Mar-2025	12:41:57 PM	76	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	12:41:57 PM	76	1,337.50	CEUX
GENMAB A/S	31-Mar-2025	12:44:03 PM	44	1,338.00	XCSE
GENMAB A/S	31-Mar-2025	12:44:03 PM	1	1,338.00	XCSE
GENMAB A/S	31-Mar-2025	12:44:03 PM	1	1,338.00	XCSE
GENMAB A/S	31-Mar-2025	12:48:34 PM	10	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	50	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	12	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	44	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	11	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	12	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	12	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	25	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	11	1,340.50	XCSE

14

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	12:48:56 PM	12	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:56 PM	72	1,340.50	CEUX
GENMAB A/S	31-Mar-2025	12:48:57 PM	41	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:57 PM	37	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:57 PM	12	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:57 PM	11	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:57 PM	26	1,340.00	TQEX
GENMAB A/S	31-Mar-2025	12:48:58 PM	81	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:58 PM	27	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	12:48:58 PM	81	1,339.50	CEUX
GENMAB A/S	31-Mar-2025	12:49:00 PM	29	1,339.00	TQEX
GENMAB A/S	31-Mar-2025	12:49:00 PM	26	1,339.00	AQEU
GENMAB A/S	31-Mar-2025	12:49:13 PM	79	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	12:49:13 PM	2	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	12:49:13 PM	64	1,338.50	CEUX
GENMAB A/S	31-Mar-2025	12:52:48 PM	27	1,338.00	AQEU
GENMAB A/S	31-Mar-2025	12:52:49 PM	69	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	12:52:49 PM	10	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	12:52:53 PM	38	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	12:52:59 PM	80	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	12:54:27 PM	34	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	12:54:27 PM	44	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	12:54:27 PM	22	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	12:54:27 PM	2	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	12:54:27 PM	20	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	12:56:17 PM	35	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	12:56:19 PM	22	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	12:56:19 PM	18	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	12:56:23 PM	65	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	12:59:55 PM	37	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	12:59:55 PM	5	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	12:59:55 PM	13	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	12:59:55 PM	29	1,336.00	CEUX
GENMAB A/S	31-Mar-2025	12:59:58 PM	13	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:00:01 PM	34	1,336.00	CEUX
GENMAB A/S	31-Mar-2025	13:00:33 PM	13	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:00:33 PM	11	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:00:33 PM	37	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:00:33 PM	12	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:01:01 PM	44	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:01:09 PM	80	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:01:09 PM	24	1,336.00	TQEX
GENMAB A/S	31-Mar-2025	13:01:09 PM	5	1,336.00	CEUX
GENMAB A/S	31-Mar-2025	13:01:53 PM	42	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:01:53 PM	11	1,336.00	XCSE

15

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	13:01:53 PM	13	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:01:53 PM	22	1,336.00	AQEU
GENMAB A/S	31-Mar-2025	13:02:14 PM	83	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:02:21 PM	6	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	13:02:21 PM	11	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	13:03:26 PM	1	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:04:24 PM	2	1,340.50	TQEX
GENMAB A/S	31-Mar-2025	13:04:25 PM	22	1,340.50	TQEX
GENMAB A/S	31-Mar-2025	13:05:40 PM	62	1,341.00	CEUX
GENMAB A/S	31-Mar-2025	13:06:01 PM	83	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:06:01 PM	1	1,340.50	AQEU
GENMAB A/S	31-Mar-2025	13:06:01 PM	24	1,340.50	AQEU
GENMAB A/S	31-Mar-2025	13:06:16 PM	13	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:06:23 PM	11	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:06:39 PM	12	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:06:39 PM	12	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:06:39 PM	35	1,340.00	CEUX
GENMAB A/S	31-Mar-2025	13:06:39 PM	24	1,340.00	CEUX
GENMAB A/S	31-Mar-2025	13:09:36 PM	2	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	13:09:36 PM	1	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	13:10:03 PM	26	1,341.00	TQEX
GENMAB A/S	31-Mar-2025	13:12:06 PM	25	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:12:06 PM	51	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:12:06 PM	22	1,340.50	CEUX
GENMAB A/S	31-Mar-2025	13:15:07 PM	37	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	9	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	13	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	1	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	13	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	13	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	37	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	2	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:07 PM	13	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:08 PM	37	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:08 PM	11	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:08 PM	13	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:09 PM	1	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:09 PM	74	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:09 PM	3	1,340.50	XCSE
GENMAB A/S	31-Mar-2025	13:15:09 PM	23	1,340.50	TQEX
GENMAB A/S	31-Mar-2025	13:15:09 PM	54	1,340.50	CEUX
GENMAB A/S	31-Mar-2025	13:15:09 PM	13	1,340.50	CEUX
GENMAB A/S	31-Mar-2025	13:16:16 PM	12	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:16:16 PM	12	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:16:16 PM	11	1,341.50	XCSE

16

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	13:17:00 PM	12	1,343.50	XCSE
GENMAB A/S	31-Mar-2025	13:17:21 PM	10	1,343.50	XCSE
GENMAB A/S	31-Mar-2025	13:17:21 PM	60	1,343.50	XCSE
GENMAB A/S	31-Mar-2025	13:17:21 PM	37	1,343.50	XCSE
GENMAB A/S	31-Mar-2025	13:17:21 PM	66	1,343.50	CEUX
GENMAB A/S	31-Mar-2025	13:19:19 PM	79	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:19:20 PM	44	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:19:20 PM	13	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:19:20 PM	12	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:19:20 PM	57	1,342.50	CEUX
GENMAB A/S	31-Mar-2025	13:19:20 PM	2	1,342.50	CEUX
GENMAB A/S	31-Mar-2025	13:19:20 PM	6	1,342.50	CEUX
GENMAB A/S	31-Mar-2025	13:20:00 PM	1	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	80	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	28	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	76	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	80	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	25	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	37	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	13	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	7	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	22	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:34 PM	23	1,342.00	TQEX
GENMAB A/S	31-Mar-2025	13:20:34 PM	43	1,342.50	CEUX
GENMAB A/S	31-Mar-2025	13:20:36 PM	83	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:36 PM	45	1,341.50	CEUX
GENMAB A/S	31-Mar-2025	13:20:41 PM	12	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:41 PM	12	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:20:45 PM	15	1,342.00	AQEU
GENMAB A/S	31-Mar-2025	13:21:25 PM	1	1,343.00	XCSE
GENMAB A/S	31-Mar-2025	13:22:25 PM	1	1,343.00	XCSE
GENMAB A/S	31-Mar-2025	13:22:41 PM	81	1,342.50	XCSE
GENMAB A/S	31-Mar-2025	13:22:41 PM	79	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:22:41 PM	45	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	13:22:41 PM	37	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:22:41 PM	22	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:22:41 PM	18	1,342.00	AQEU
GENMAB A/S	31-Mar-2025	13:22:41 PM	24	1,342.50	CEUX
GENMAB A/S	31-Mar-2025	13:22:41 PM	27	1,341.00	CEUX
GENMAB A/S	31-Mar-2025	13:22:51 PM	30	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	13:22:51 PM	8	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	13:22:51 PM	37	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	13:22:51 PM	12	1,341.00	XCSE
GENMAB A/S	31-Mar-2025	13:22:51 PM	17	1,341.50	XCSE
GENMAB A/S	31-Mar-2025	13:22:51 PM	79	1,340.50	XCSE

17

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	13:22:51 PM	25	1,340.50	AQEU
GENMAB A/S	31-Mar-2025	13:23:00 PM	7	1,339.00	XCSE
GENMAB A/S	31-Mar-2025	13:23:00 PM	72	1,339.00	XCSE
GENMAB A/S	31-Mar-2025	13:23:00 PM	23	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:23:00 PM	30	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:23:00 PM	11	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:23:00 PM	37	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:23:00 PM	3	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:24:05 PM	41	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:24:05 PM	30	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:24:05 PM	1	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:24:05 PM	1	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:24:05 PM	31	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:25:13 PM	23	1,339.00	CEUX
GENMAB A/S	31-Mar-2025	13:26:25 PM	1	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:26:25 PM	1	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:26:25 PM	1	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:26:25 PM	2	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:26:25 PM	2	1,339.50	XCSE
GENMAB A/S	31-Mar-2025	13:26:38 PM	10	1,339.00	CEUX
GENMAB A/S	31-Mar-2025	13:26:38 PM	6	1,339.00	CEUX
GENMAB A/S	31-Mar-2025	13:26:38 PM	8	1,339.00	CEUX
GENMAB A/S	31-Mar-2025	13:27:19 PM	82	1,339.00	XCSE
GENMAB A/S	31-Mar-2025	13:27:19 PM	22	1,339.00	TQEX
GENMAB A/S	31-Mar-2025	13:28:57 PM	12	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:28:57 PM	21	1,339.00	XCSE
GENMAB A/S	31-Mar-2025	13:28:57 PM	11	1,338.50	AQEU
GENMAB A/S	31-Mar-2025	13:28:57 PM	5	1,338.50	AQEU
GENMAB A/S	31-Mar-2025	13:28:57 PM	19	1,338.50	AQEU
GENMAB A/S	31-Mar-2025	13:28:57 PM	30	1,339.00	CEUX
GENMAB A/S	31-Mar-2025	13:30:26 PM	1	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:30:26 PM	1	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	79	1,338.00	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	1	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	12	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	30	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	37	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	10	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	14	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:31:24 PM	29	1,338.00	CEUX
GENMAB A/S	31-Mar-2025	13:32:26 PM	81	1,338.50	XCSE
GENMAB A/S	31-Mar-2025	13:33:05 PM	25	1,338.00	AQEU
GENMAB A/S	31-Mar-2025	13:33:05 PM	3	1,338.00	AQEU
GENMAB A/S	31-Mar-2025	13:33:05 PM	32	1,338.00	CEUX
GENMAB A/S	31-Mar-2025	13:33:26 PM	22	1,337.50	TQEX

18

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	13:35:08 PM	82	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	13:35:48 PM	22	1,336.50	AQEU
GENMAB A/S	31-Mar-2025	13:35:48 PM	23	1,336.50	CEUX
GENMAB A/S	31-Mar-2025	13:37:26 PM	80	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:37:57 PM	22	1,337.50	TQEX
GENMAB A/S	31-Mar-2025	13:38:01 PM	43	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	13:38:32 PM	26	1,337.00	AQEU
GENMAB A/S	31-Mar-2025	13:40:49 PM	82	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	13:40:49 PM	22	1,338.00	XCSE
GENMAB A/S	31-Mar-2025	13:40:49 PM	54	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	13:41:56 PM	40	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	13:43:02 PM	17	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:43:02 PM	62	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:43:02 PM	50	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:43:02 PM	8	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	13:43:26 PM	12	1,336.00	CEUX
GENMAB A/S	31-Mar-2025	13:45:37 PM	82	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:45:37 PM	40	1,336.50	TQEX
GENMAB A/S	31-Mar-2025	13:47:15 PM	1	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	13:49:30 PM	82	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	13:49:30 PM	51	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	13:49:53 PM	12	1,338.00	XCSE
GENMAB A/S	31-Mar-2025	13:49:53 PM	10	1,338.00	XCSE
GENMAB A/S	31-Mar-2025	13:50:26 PM	1	1,337.50	XCSE
GENMAB A/S	31-Mar-2025	13:52:04 PM	82	1,337.00	CEUX
GENMAB A/S	31-Mar-2025	13:52:25 PM	1	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	13:52:25 PM	13	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	13:52:26 PM	3	1,337.00	XCSE
GENMAB A/S	31-Mar-2025	13:53:22 PM	80	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:53:24 PM	17	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:53:24 PM	11	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:53:24 PM	11	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:53:26 PM	2	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:53:26 PM	3	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:53:34 PM	40	1,336.00	CEUX
GENMAB A/S	31-Mar-2025	13:54:28 PM	13	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:28 PM	12	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:35 PM	13	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:35 PM	11	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:35 PM	12	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:35 PM	13	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:36 PM	11	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:36 PM	11	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:54:36 PM	82	1,336.00	CEUX
GENMAB A/S	31-Mar-2025	13:54:55 PM	12	1,336.50	XCSE

19

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	13:54:55 PM	10	1,336.50	XCSE
GENMAB A/S	31-Mar-2025	13:55:25 PM	11	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:55:25 PM	11	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:57:25 PM	1	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:57:26 PM	12	1,336.00	XCSE
GENMAB A/S	31-Mar-2025	13:59:45 PM	6	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	13:59:52 PM	73	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	13:59:52 PM	22	1,335.50	TQEX
GENMAB A/S	31-Mar-2025	13:59:53 PM	42	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	13:59:53 PM	14	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	13:59:53 PM	12	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	13:59:53 PM	10	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	14:00:00 PM	1	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:00:00 PM	11	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:00:00 PM	35	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:00:00 PM	8	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:00:25 PM	30	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:00:25 PM	12	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:00:25 PM	11	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:00:25 PM	36	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:00:25 PM	1	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:00:25 PM	9	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:01:01 PM	11	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:01:01 PM	11	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:01:15 PM	2	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:01:15 PM	11	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:03:17 PM	80	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:03:17 PM	32	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	14:03:19 PM	22	1,334.50	CEUX
GENMAB A/S	31-Mar-2025	14:03:19 PM	56	1,334.50	CEUX
GENMAB A/S	31-Mar-2025	14:05:19 PM	69	1,334.00	XCSE
GENMAB A/S	31-Mar-2025	14:06:00 PM	22	1,334.50	TQEX
GENMAB A/S	31-Mar-2025	14:09:26 PM	3	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:09:26 PM	1	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:10:25 PM	1	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:10:25 PM	1	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:10:25 PM	2	1,335.50	XCSE
GENMAB A/S	31-Mar-2025	14:10:25 PM	11	1,335.50	CEUX
GENMAB A/S	31-Mar-2025	14:10:26 PM	7	1,335.50	CEUX
GENMAB A/S	31-Mar-2025	14:10:34 PM	83	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:02 PM	64	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	14:11:11 PM	26	1,335.00	TQEX
GENMAB A/S	31-Mar-2025	14:11:11 PM	26	1,335.00	AQEU
GENMAB A/S	31-Mar-2025	14:11:11 PM	13	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	14:11:11 PM	15	1,335.00	CEUX

20

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	14:11:21 PM	11	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:21 PM	36	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	14:11:21 PM	5	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	14:11:22 PM	12	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:22 PM	11	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:22 PM	14	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:22 PM	28	1,335.00	CEUX
GENMAB A/S	31-Mar-2025	14:11:23 PM	11	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:23 PM	1	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:23 PM	14	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:23 PM	12	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:23 PM	13	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:23 PM	11	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:24 PM	13	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:25 PM	12	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:26 PM	11	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:26 PM	12	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:26 PM	42	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	12	1,334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	1	1,334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	28	1,334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	13	1,334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	41	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	9	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	12	1,334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	11	1,334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	28	1,334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	4	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	11	1,335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	38	1335.00	XCSE
GENMAB A/S	31-Mar-2025	14:11:27 PM	27	1334.50	AQEU
GENMAB A/S	31-Mar-2025	14:11:27 PM	79	1334.50	CEUX
GENMAB A/S	31-Mar-2025	14:11:28 PM	11	1334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:28 PM	11	1334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:35 PM	17	1334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:35 PM	12	1334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:35 PM	42	1334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:35 PM	4	1334.50	XCSE
GENMAB A/S	31-Mar-2025	14:11:35 PM	7	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:12:21 PM	22	1333.50	TQEX
GENMAB A/S	31-Mar-2025	14:12:21 PM	78	1333.50	CEUX
GENMAB A/S	31-Mar-2025	14:12:36 PM	3	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:12:40 PM	5	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:13:05 PM	1	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:13:05 PM	12	1333.50	XCSE

21

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	14:13:05 PM	12	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:13:05 PM	19	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:13:26 PM	13	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:14:25 PM	2	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:14:25 PM	75	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:14:25 PM	28	1332.50	TQEX
GENMAB A/S	31-Mar-2025	14:14:25 PM	81	1332.50	CEUX
GENMAB A/S	31-Mar-2025	14:17:24 PM	23	1331.50	AQEU
GENMAB A/S	31-Mar-2025	14:17:24 PM	82	1331.50	CEUX
GENMAB A/S	31-Mar-2025	14:17:28 PM	3	1331.50	XCSE
GENMAB A/S	31-Mar-2025	14:17:28 PM	48	1331.00	XCSE
GENMAB A/S	31-Mar-2025	14:18:18 PM	83	1332.00	XCSE
GENMAB A/S	31-Mar-2025	14:18:18 PM	31	1332.00	TQEX
GENMAB A/S	31-Mar-2025	14:18:18 PM	76	1332.00	CEUX
GENMAB A/S	31-Mar-2025	14:18:28 PM	70	1332.00	XCSE
GENMAB A/S	31-Mar-2025	14:18:28 PM	8	1332.00	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	11	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	11	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	1	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	1	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	12	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	13	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	42	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	12	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	6	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:02 PM	9	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:03 PM	12	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:03 PM	13	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:03 PM	17	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:03 PM	11	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:03 PM	11	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:03 PM	12	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:09 PM	12	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:19:15 PM	12	1332.50	XCSE
GENMAB A/S	31-Mar-2025	14:20:09 PM	29	1332.50	TQEX
GENMAB A/S	31-Mar-2025	14:20:19 PM	15	1332.00	XCSE
GENMAB A/S	31-Mar-2025	14:20:46 PM	27	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:21:14 PM	27	1333.50	TQEX
GENMAB A/S	31-Mar-2025	14:21:25 PM	1	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:21:26 PM	14	1333.50	CEUX
GENMAB A/S	31-Mar-2025	14:23:09 PM	23	1333.50	TQEX
GENMAB A/S	31-Mar-2025	14:23:26 PM	1	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:23:26 PM	1	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:23:56 PM	23	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:23:56 PM	77	1335.50	XCSE

22

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	14:23:56 PM	24	1335.50	TQEX
GENMAB A/S	31-Mar-2025	14:23:56 PM	82	1335.00	CEUX
GENMAB A/S	31-Mar-2025	14:25:00 PM	1	1335.50	XCSE
GENMAB A/S	31-Mar-2025	14:25:00 PM	6	1335.50	XCSE
GENMAB A/S	31-Mar-2025	14:25:44 PM	1	1335.50	XCSE
GENMAB A/S	31-Mar-2025	14:25:46 PM	21	1335.50	CEUX
GENMAB A/S	31-Mar-2025	14:27:00 PM	1	1336.50	XCSE
GENMAB A/S	31-Mar-2025	14:27:19 PM	9	1337.50	XCSE
GENMAB A/S	31-Mar-2025	14:28:26 PM	82	1337.00	XCSE
GENMAB A/S	31-Mar-2025	14:28:26 PM	78	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:28:26 PM	78	1335.00	XCSE
GENMAB A/S	31-Mar-2025	14:28:26 PM	76	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:28:26 PM	104	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:28:26 PM	23	1337.00	TQEX
GENMAB A/S	31-Mar-2025	14:28:26 PM	1	1335.50	TQEX
GENMAB A/S	31-Mar-2025	14:28:26 PM	21	1335.50	TQEX
GENMAB A/S	31-Mar-2025	14:28:26 PM	22	1337.00	AQEU
GENMAB A/S	31-Mar-2025	14:28:26 PM	36	1336.00	AQEU
GENMAB A/S	31-Mar-2025	14:28:26 PM	26	1335.50	AQEU
GENMAB A/S	31-Mar-2025	14:28:26 PM	24	1334.00	AQEU
GENMAB A/S	31-Mar-2025	14:28:26 PM	81	1337.00	CEUX
GENMAB A/S	31-Mar-2025	14:28:26 PM	81	1335.50	CEUX
GENMAB A/S	31-Mar-2025	14:28:26 PM	65	1334.00	CEUX
GENMAB A/S	31-Mar-2025	14:28:26 PM	16	1334.00	CEUX
GENMAB A/S	31-Mar-2025	14:28:26 PM	32	1334.50	CEUX
GENMAB A/S	31-Mar-2025	14:28:30 PM	104	1333.50	XCSE
GENMAB A/S	31-Mar-2025	14:28:30 PM	23	1333.50	AQEU
GENMAB A/S	31-Mar-2025	14:30:00 PM	76	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:30:00 PM	22	1334.00	AQEU
GENMAB A/S	31-Mar-2025	14:30:01 PM	43	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:30:01 PM	29	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:30:01 PM	25	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:30:01 PM	7	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:30:08 PM	76	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:30:13 PM	22	1334.00	AQEU
GENMAB A/S	31-Mar-2025	14:30:13 PM	76	1333.50	CEUX
GENMAB A/S	31-Mar-2025	14:30:45 PM	83	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:30:45 PM	22	1333.00	AQEU
GENMAB A/S	31-Mar-2025	14:33:05 PM	36	1335.00	XCSE
GENMAB A/S	31-Mar-2025	14:33:05 PM	46	1335.00	XCSE
GENMAB A/S	31-Mar-2025	14:33:33 PM	78	1334.00	XCSE
GENMAB A/S	31-Mar-2025	14:33:33 PM	23	1334.00	AQEU
GENMAB A/S	31-Mar-2025	14:33:33 PM	32	1334.00	CEUX
GENMAB A/S	31-Mar-2025	14:33:42 PM	41	1333.50	CEUX
GENMAB A/S	31-Mar-2025	14:33:42 PM	39	1333.50	CEUX

23

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	14:33:54 PM	81	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:34:07 PM	26	1333.00	AQEU
GENMAB A/S	31-Mar-2025	14:34:12 PM	10	1332.50	CEUX
GENMAB A/S	31-Mar-2025	14:34:12 PM	66	1332.50	CEUX
GENMAB A/S	31-Mar-2025	14:34:17 PM	79	1332.00	XCSE
GENMAB A/S	31-Mar-2025	14:34:31 PM	58	1331.50	CEUX
GENMAB A/S	31-Mar-2025	14:34:31 PM	10	1331.50	CEUX
GENMAB A/S	31-Mar-2025	14:34:31 PM	12	1331.50	CEUX
GENMAB A/S	31-Mar-2025	14:37:17 PM	30	1332.50	TQEX
GENMAB A/S	31-Mar-2025	14:37:17 PM	70	1332.50	CEUX
GENMAB A/S	31-Mar-2025	14:38:26 PM	3	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:38:26 PM	11	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:38:26 PM	11	1333.00	XCSE
GENMAB A/S	31-Mar-2025	14:39:26 PM	36	1333.50	CEUX
GENMAB A/S	31-Mar-2025	14:41:36 PM	1	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:36 PM	12	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:36 PM	11	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:36 PM	11	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:36 PM	1	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	22	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	12	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	11	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	4	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	42	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	25	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	11	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	11	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	12	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	12	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:37 PM	30	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:38 PM	11	1336.00	XCSE
GENMAB A/S	31-Mar-2025	14:41:41 PM	80	1335.50	XCSE
GENMAB A/S	31-Mar-2025	14:42:55 PM	11	1335.50	XCSE
GENMAB A/S	31-Mar-2025	14:42:55 PM	23	1336.00	TQEX
GENMAB A/S	31-Mar-2025	14:43:25 PM	20	1337.00	XCSE
GENMAB A/S	31-Mar-2025	14:43:31 PM	15	1337.50	CEUX
GENMAB A/S	31-Mar-2025	14:43:45 PM	12	1338.00	XCSE
GENMAB A/S	31-Mar-2025	14:43:45 PM	10	1338.00	XCSE
GENMAB A/S	31-Mar-2025	14:43:57 PM	77	1337.50	XCSE
GENMAB A/S	31-Mar-2025	14:43:57 PM	62	1337.50	CEUX
GENMAB A/S	31-Mar-2025	14:44:01 PM	33	1337.50	AQEU
GENMAB A/S	31-Mar-2025	14:45:26 PM	2	1337.50	XCSE
GENMAB A/S	31-Mar-2025	14:45:26 PM	1	1337.50	XCSE
GENMAB A/S	31-Mar-2025	14:45:26 PM	1	1337.50	XCSE
GENMAB A/S	31-Mar-2025	14:47:08 PM	76	1338.50	CEUX

24

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	14:47:09 PM	22	1338.00	TQEX
GENMAB A/S	31-Mar-2025	14:47:09 PM	33	1338.00	AQEU
GENMAB A/S	31-Mar-2025	14:47:10 PM	81	1337.50	XCSE
GENMAB A/S	31-Mar-2025	14:47:10 PM	77	1337.50	CEUX
GENMAB A/S	31-Mar-2025	14:48:12 PM	11	1338.50	CEUX
GENMAB A/S	31-Mar-2025	14:48:25 PM	14	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:48:25 PM	42	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:48:25 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:48:25 PM	9	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:48:26 PM	9	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:00 PM	29	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:00 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:15 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:15 PM	10	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:45 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:45 PM	20	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:45 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:49:45 PM	28	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:50:25 PM	41	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:50:25 PM	4	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:50:25 PM	19	1338.50	AQEU
GENMAB A/S	31-Mar-2025	14:50:25 PM	66	1338.50	CEUX
GENMAB A/S	31-Mar-2025	14:50:32 PM	4	1338.50	AQEU
GENMAB A/S	31-Mar-2025	14:51:51 PM	76	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:51:51 PM	65	1338.50	CEUX
GENMAB A/S	31-Mar-2025	14:51:51 PM	15	1338.50	CEUX
GENMAB A/S	31-Mar-2025	14:52:02 PM	5	1338.00	TQEX
GENMAB A/S	31-Mar-2025	14:52:02 PM	17	1338.00	TQEX
GENMAB A/S	31-Mar-2025	14:52:31 PM	1	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:52:32 PM	102	1338.00	XCSE
GENMAB A/S	31-Mar-2025	14:52:32 PM	33	1338.00	AQEU
GENMAB A/S	31-Mar-2025	14:53:03 PM	19	1338.50	CEUX
GENMAB A/S	31-Mar-2025	14:53:03 PM	57	1338.50	CEUX
GENMAB A/S	31-Mar-2025	14:53:19 PM	22	1338.00	TQEX
GENMAB A/S	31-Mar-2025	14:54:25 PM	13	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:54:25 PM	14	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:54:25 PM	1	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:54:26 PM	1	1338.50	XCSE
GENMAB A/S	31-Mar-2025	14:56:26 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:56:26 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:57:31 PM	80	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:57:31 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:04 PM	41	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:04 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:04 PM	13	1339.00	XCSE

25

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	14:59:04 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:26 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:26 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:27 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:27 PM	2	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:27 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:27 PM	16	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:49 PM	41	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:49 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:49 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:49 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:55 PM	4	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:55 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	14:59:55 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:00:14 PM	12	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:00:23 PM	6	1340.50	CEUX
GENMAB A/S	31-Mar-2025	15:00:23 PM	6	1340.50	CEUX
GENMAB A/S	31-Mar-2025	15:00:32 PM	3	1340.00	XCSE
GENMAB A/S	31-Mar-2025	15:00:32 PM	79	1340.00	XCSE
GENMAB A/S	31-Mar-2025	15:00:32 PM	31	1340.00	TQEX
GENMAB A/S	31-Mar-2025	15:00:32 PM	82	1340.00	CEUX
GENMAB A/S	31-Mar-2025	15:03:25 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:04:06 PM	82	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:05:25 PM	32	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:05:41 PM	41	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:05:41 PM	2	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:05:41 PM	1	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:05:41 PM	22	1344.50	TQEX
GENMAB A/S	31-Mar-2025	15:05:41 PM	83	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:06:25 PM	44	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	3	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	37	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	8	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	28	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	37	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	3	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	1	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	37	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	36	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:25 PM	1	1344.50	XCSE

26

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:06:26 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:26 PM	37	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:26 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:26 PM	36	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:06:26 PM	6	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:07:26 PM	42	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:07:26 PM	1	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:07:26 PM	37	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:08:09 PM	79	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:08:25 PM	17	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:26 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:37 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:47 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:47 PM	34	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:51 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:51 PM	34	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:57 PM	16	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:08:57 PM	6	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:09:00 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:09:00 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:09:00 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:09:00 PM	8	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:09:05 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:09:05 PM	16	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:09:08 PM	83	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:09:08 PM	26	1343.50	TQEX
GENMAB A/S	31-Mar-2025	15:09:08 PM	23	1343.50	AQEU
GENMAB A/S	31-Mar-2025	15:09:08 PM	7	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:09:08 PM	31	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:09:10 PM	82	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:09:10 PM	24	1342.50	TQEX
GENMAB A/S	31-Mar-2025	15:09:10 PM	56	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:09:10 PM	21	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:09:10 PM	82	1342.00	CEUX
GENMAB A/S	31-Mar-2025	15:09:32 PM	70	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:10:48 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:10:48 PM	23	1342.50	AQEU
GENMAB A/S	31-Mar-2025	15:11:03 PM	1	1342.50	AQEU
GENMAB A/S	31-Mar-2025	15:11:56 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:11:57 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:12:03 PM	3	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:12:17 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:12:17 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:12:17 PM	14	1342.00	CEUX
GENMAB A/S	31-Mar-2025	15:14:00 PM	2	1343.00	XCSE

27

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:14:00 PM	30	1343.00	TQEX
GENMAB A/S	31-Mar-2025	15:14:00 PM	34	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:14:00 PM	45	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:14:03 PM	78	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:14:03 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:14:03 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:14:03 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:14:03 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:14:03 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:14:03 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:14:03 PM	24	1342.50	AQEU
GENMAB A/S	31-Mar-2025	15:14:25 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:14:26 PM	2	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:15:19 PM	81	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:15:19 PM	32	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:18:26 PM	31	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:18:27 PM	11	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	47	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:21:02 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:21:02 PM	28	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:21:02 PM	29	1343.00	TQEX
GENMAB A/S	31-Mar-2025	15:21:02 PM	36	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	27	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	9	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	18	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	30	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	20	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:02 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:21:26 PM	8	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:22:12 PM	12	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:22:25 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:22:25 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:22:25 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:22:25 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:22:25 PM	36	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:22:39 PM	26	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:22:39 PM	37	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:22:39 PM	36	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:22:39 PM	5	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:22:39 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:22:40 PM	20	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:22:40 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:22:40 PM	5	1343.50	CEUX

28

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:22:40 PM	26	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:22:40 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:22:44 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:22:49 PM	4	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:22:51 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:23:27 PM	1	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:23:34 PM	77	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:23:58 PM	9	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:24:26 PM	52	1343.00	TQEX
GENMAB A/S	31-Mar-2025	15:24:26 PM	74	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:24:27 PM	14	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:24:27 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:24:27 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:24:59 PM	76	1342.50	XCSE
GENMAB A/S	31-Mar-2025	15:25:27 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:25:27 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:25:27 PM	13	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:25:27 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:25:27 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:25:34 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	15:25:51 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:51 PM	30	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:51 PM	17	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:51 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:51 PM	9	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:51 PM	24	1342.50	AQEU
GENMAB A/S	31-Mar-2025	15:25:52 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	3	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	30	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	9	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	19	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	24	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:52 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:53 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:53 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:53 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:53 PM	13	1343.00	XCSE

29

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:25:53 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:53 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	18	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	29	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	16	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:54 PM	5	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:55 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:55 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:55 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:55 PM	16	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:55 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:55 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:55 PM	31	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	7	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	16	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	37	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:25:56 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:26:26 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:26:30 PM	41	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:26:30 PM	9	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:26:30 PM	18	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:26:30 PM	23	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:26:30 PM	4	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:26:30 PM	15	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:26:30 PM	16	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:26:30 PM	12	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:26:30 PM	1	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:26:30 PM	36	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:26:30 PM	4	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:00 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:27:00 PM	1	1345.00	XCSE

30

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:27:00 PM	3	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:27:00 PM	12	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:03 PM	15	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:03 PM	15	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:21 PM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:27:21 PM	10	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:22 PM	6	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:27:36 PM	27	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:37 PM	3	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:27:37 PM	11	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:38 PM	16	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:27:39 PM	6	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:27:54 PM	1	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:28:00 PM	3	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:28:00 PM	30	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:28:00 PM	15	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:28:49 PM	51	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:29:03 PM	29	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:29:03 PM	7	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:29:14 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:29:14 PM	63	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:29:14 PM	22	1345.50	AQEU
GENMAB A/S	31-Mar-2025	15:29:15 PM	36	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:29:15 PM	13	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:29:20 PM	42	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:29:21 PM	7	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:29:22 PM	25	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:29:23 PM	16	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:29:27 PM	2	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:29:39 PM	28	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:29:49 PM	12	1346.50	XCSE
GENMAB A/S	31-Mar-2025	15:29:49 PM	98	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:30:07 PM	34	1347.50	TQEX
GENMAB A/S	31-Mar-2025	15:30:10 PM	36	1347.50	TQEX
GENMAB A/S	31-Mar-2025	15:30:10 PM	36	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:30:10 PM	5	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:30:10 PM	6	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:30:11 PM	27	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:30:14 PM	17	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	14	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	37	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	14	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	37	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	2	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	79	1346.00	XCSE

31

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:30:17 PM	37	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	13	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	12	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	30	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:30:17 PM	66	1346.00	TQEX
GENMAB A/S	31-Mar-2025	15:30:17 PM	64	1345.00	TQEX
GENMAB A/S	31-Mar-2025	15:30:17 PM	22	1346.00	AQEU
GENMAB A/S	31-Mar-2025	15:30:17 PM	22	1345.00	AQEU
GENMAB A/S	31-Mar-2025	15:30:17 PM	10	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:30:17 PM	80	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:30:17 PM	82	1345.00	CEUX
GENMAB A/S	31-Mar-2025	15:31:05 PM	79	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:31:05 PM	25	1347.00	TQEX
GENMAB A/S	31-Mar-2025	15:31:05 PM	31	1347.50	AQEU
GENMAB A/S	31-Mar-2025	15:31:05 PM	23	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:31:22 PM	53	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:31:22 PM	36	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:31:22 PM	30	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:31:28 PM	22	1347.00	TQEX
GENMAB A/S	31-Mar-2025	15:31:28 PM	25	1347.00	AQEU
GENMAB A/S	31-Mar-2025	15:31:28 PM	79	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:31:29 PM	41	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:31:29 PM	13	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:31:32 PM	19	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:31:32 PM	12	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:03 PM	27	1348.50	TQEX
GENMAB A/S	31-Mar-2025	15:32:19 PM	78	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:19 PM	81	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:32:19 PM	10	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:32:19 PM	12	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:32:26 PM	21	1348.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:26 PM	13	1348.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:26 PM	12	1348.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:26 PM	76	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:32:29 PM	16	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	60	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	30	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	37	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	44	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	37	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:29 PM	62	1347.00	CEUX

32

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:32:29 PM	20	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:32:30 PM	30	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:30 PM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:30 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:30 PM	13	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:30 PM	37	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:30 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:46 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:46 PM	37	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:49 PM	43	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:49 PM	10	1346.50	AQEU
GENMAB A/S	31-Mar-2025	15:32:49 PM	71	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:32:51 PM	13	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:51 PM	83	1346.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	30	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	37	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	11	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	13	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	13	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	30	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	13	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	12	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	11	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:52 PM	30	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:55 PM	5	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:32:55 PM	28	1346.00	TQEX
GENMAB A/S	31-Mar-2025	15:32:55 PM	7	1346.50	AQEU
GENMAB A/S	31-Mar-2025	15:32:55 PM	6	1346.50	AQEU
GENMAB A/S	31-Mar-2025	15:32:55 PM	83	1346.00	CEUX
GENMAB A/S	31-Mar-2025	15:32:56 PM	5	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:32:56 PM	74	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:33:15 PM	44	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:33:15 PM	37	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:33:15 PM	23	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:33:28 PM	2	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:33:50 PM	81	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:33:50 PM	23	1346.00	TQEX
GENMAB A/S	31-Mar-2025	15:34:04 PM	50	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:34:04 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:34:04 PM	22	1345.50	XCSE
GENMAB A/S	31-Mar-2025	15:34:04 PM	19	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:04 PM	41	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:04 PM	12	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:04 PM	14	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:04 PM	37	1346.00	XCSE

33

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:34:04 PM	77	1345.50	CEUX
GENMAB A/S	31-Mar-2025	15:34:04 PM	2	1345.50	CEUX
GENMAB A/S	31-Mar-2025	15:34:15 PM	11	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:15 PM	11	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:15 PM	37	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:15 PM	31	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:15 PM	13	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:15 PM	1	1346.00	XCSE
GENMAB A/S	31-Mar-2025	15:34:16 PM	80	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:34:16 PM	26	1344.50	TQEX
GENMAB A/S	31-Mar-2025	15:34:16 PM	82	1344.50	CEUX
GENMAB A/S	31-Mar-2025	15:34:19 PM	41	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:34:39 PM	82	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:11 PM	82	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:35:11 PM	37	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:35:11 PM	24	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:35:11 PM	23	1344.50	TQEX
GENMAB A/S	31-Mar-2025	15:35:11 PM	74	1344.50	CEUX
GENMAB A/S	31-Mar-2025	15:35:11 PM	3	1344.50	CEUX
GENMAB A/S	31-Mar-2025	15:35:12 PM	79	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:13 PM	23	1344.00	AQEU
GENMAB A/S	31-Mar-2025	15:35:42 PM	6	1344.00	AQEU
GENMAB A/S	31-Mar-2025	15:35:55 PM	16	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:55 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:55 PM	19	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:55 PM	14	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:55 PM	27	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:55 PM	9	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:35:55 PM	18	1345.00	XCSE
GENMAB A/S	31-Mar-2025	15:36:03 PM	82	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:36:03 PM	22	1344.00	TQEX
GENMAB A/S	31-Mar-2025	15:36:03 PM	18	1344.00	AQEU
GENMAB A/S	31-Mar-2025	15:36:03 PM	81	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:36:05 PM	79	1343.00	XCSE
GENMAB A/S	31-Mar-2025	15:36:07 PM	76	1342.00	CEUX
GENMAB A/S	31-Mar-2025	15:36:15 PM	50	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:36:15 PM	29	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:36:21 PM	83	1340.50	XCSE
GENMAB A/S	31-Mar-2025	15:36:21 PM	80	1340.50	CEUX
GENMAB A/S	31-Mar-2025	15:36:29 PM	83	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:36:59 PM	83	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:37:18 PM	23	1338.50	TQEX
GENMAB A/S	31-Mar-2025	15:37:39 PM	45	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:39:05 PM	1	1340.50	XCSE
GENMAB A/S	31-Mar-2025	15:39:05 PM	25	1340.50	TQEX

34

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:39:05 PM	82	1340.50	CEUX
GENMAB A/S	31-Mar-2025	15:39:25 PM	78	1340.50	XCSE
GENMAB A/S	31-Mar-2025	15:39:25 PM	43	1341.00	XCSE
GENMAB A/S	31-Mar-2025	15:39:25 PM	61	1341.00	XCSE
GENMAB A/S	31-Mar-2025	15:39:25 PM	35	1340.50	AQEU
GENMAB A/S	31-Mar-2025	15:39:25 PM	5	1340.50	AQEU
GENMAB A/S	31-Mar-2025	15:39:25 PM	76	1340.50	CEUX
GENMAB A/S	31-Mar-2025	15:39:26 PM	37	1340.50	XCSE
GENMAB A/S	31-Mar-2025	15:39:26 PM	11	1340.50	XCSE
GENMAB A/S	31-Mar-2025	15:39:26 PM	12	1340.50	XCSE
GENMAB A/S	31-Mar-2025	15:39:26 PM	44	1340.50	XCSE
GENMAB A/S	31-Mar-2025	15:39:31 PM	26	1339.50	TQEX
GENMAB A/S	31-Mar-2025	15:39:31 PM	26	1339.50	AQEU
GENMAB A/S	31-Mar-2025	15:39:31 PM	79	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:39:37 PM	77	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:39:37 PM	82	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:39:49 PM	17	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:40:09 PM	7	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:40:15 PM	4	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:40:15 PM	2	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:40:15 PM	3	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:40:24 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:40:24 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:40:39 PM	36	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:41:11 PM	42	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:41:11 PM	50	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:41:11 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:41:11 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:41:11 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:41:19 PM	71	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:42:04 PM	46	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:06 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:06 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:06 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:06 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:26 PM	41	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:26 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:26 PM	14	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:26 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:26 PM	4	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:42:27 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:19 PM	104	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:19 PM	5	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:43:19 PM	80	1338.00	CEUX
GENMAB A/S	31-Mar-2025	15:43:20 PM	41	1338.50	XCSE

35

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:43:20 PM	63	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:20 PM	24	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:20 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:20 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:20 PM	36	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:20 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:20 PM	21	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:21 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:21 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:23 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:24 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:24 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:25 PM	29	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:25 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:25 PM	41	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:25 PM	11	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:25 PM	69	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:27 PM	8	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:41 PM	5	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:43:41 PM	6	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:43:41 PM	22	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:43:55 PM	79	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:43:55 PM	30	1337.00	TQEX
GENMAB A/S	31-Mar-2025	15:43:55 PM	79	1337.00	CEUX
GENMAB A/S	31-Mar-2025	15:44:01 PM	78	1336.00	XCSE
GENMAB A/S	31-Mar-2025	15:44:01 PM	24	1336.00	TQEX
GENMAB A/S	31-Mar-2025	15:44:01 PM	11	1336.00	CEUX
GENMAB A/S	31-Mar-2025	15:44:01 PM	31	1336.00	CEUX
GENMAB A/S	31-Mar-2025	15:45:17 PM	16	1336.00	XCSE
GENMAB A/S	31-Mar-2025	15:45:31 PM	31	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:43 PM	41	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:43 PM	13	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:43 PM	13	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:44 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:44 PM	30	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:44 PM	13	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:44 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:44 PM	12	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:45 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:45 PM	16	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:51 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	15	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	13	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	49	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	12	1338.50	XCSE

36

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:45:52 PM	15	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	13	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	12	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	49	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	30	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:45:52 PM	37	1337.50	TQEX
GENMAB A/S	31-Mar-2025	15:45:52 PM	9	1337.50	CEUX
GENMAB A/S	31-Mar-2025	15:46:03 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:46:03 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:46:05 PM	13	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:46:06 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:46:14 PM	2	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:46:14 PM	2	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:46:14 PM	1	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:46:15 PM	2	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:46:15 PM	2	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:47:00 PM	83	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:47:00 PM	41	1338.50	TQEX
GENMAB A/S	31-Mar-2025	15:47:00 PM	11	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:47:00 PM	37	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:47:00 PM	43	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:47:04 PM	11	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:47:04 PM	39	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:47:04 PM	12	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:47:04 PM	42	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:47:04 PM	52	1337.50	CEUX
GENMAB A/S	31-Mar-2025	15:47:28 PM	7	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:47:58 PM	21	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:47:58 PM	16	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:47:58 PM	18	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:00 PM	38	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:48:00 PM	22	1339.00	AQEU
GENMAB A/S	31-Mar-2025	15:48:00 PM	21	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:00 PM	14	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:00 PM	11	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:00 PM	6	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:00 PM	6	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:00 PM	1	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:05 PM	39	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:48:05 PM	8	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:48:05 PM	12	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:48:05 PM	11	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:48:05 PM	18	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:48:05 PM	34	1339.00	TQEX
GENMAB A/S	31-Mar-2025	15:48:05 PM	36	1339.00	AQEU

37

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:48:05 PM	3	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:05 PM	80	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:05 PM	13	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:48:13 PM	76	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:22 PM	7	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:27 PM	16	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:28 PM	22	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:29 PM	25	1339.00	TQEX
GENMAB A/S	31-Mar-2025	15:48:29 PM	2	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:29 PM	77	1339.00	CEUX
GENMAB A/S	31-Mar-2025	15:48:32 PM	44	1338.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:09 PM	7	1338.00	TQEX
GENMAB A/S	31-Mar-2025	15:49:09 PM	27	1338.00	TQEX
GENMAB A/S	31-Mar-2025	15:49:09 PM	36	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:49:09 PM	5	1338.50	CEUX
GENMAB A/S	31-Mar-2025	15:49:19 PM	1	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:19 PM	1	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:19 PM	1	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:19 PM	9	1338.00	CEUX
GENMAB A/S	31-Mar-2025	15:49:19 PM	13	1338.00	CEUX
GENMAB A/S	31-Mar-2025	15:49:20 PM	1	1338.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:26 PM	6	1338.00	CEUX
GENMAB A/S	31-Mar-2025	15:49:38 PM	77	1337.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	19	1337.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	12	1337.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	82	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	11	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	12	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	39	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	8	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:38 PM	37	1337.00	TQEX
GENMAB A/S	31-Mar-2025	15:49:38 PM	22	1336.50	AQEU
GENMAB A/S	31-Mar-2025	15:49:38 PM	20	1337.50	CEUX
GENMAB A/S	31-Mar-2025	15:49:38 PM	32	1337.50	CEUX
GENMAB A/S	31-Mar-2025	15:49:38 PM	80	1336.50	CEUX
GENMAB A/S	31-Mar-2025	15:49:39 PM	12	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:39 PM	12	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:39 PM	39	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:39 PM	11	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:39 PM	12	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:39 PM	18	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:39 PM	11	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:39 PM	11	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:40 PM	13	1336.50	XCSE
GENMAB A/S	31-Mar-2025	15:49:49 PM	32	1337.00	XCSE

38

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:49:49 PM	11	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:49 PM	9	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:49 PM	13	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:49 PM	12	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:49 PM	27	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:49 PM	61	1336.50	CEUX
GENMAB A/S	31-Mar-2025	15:49:53 PM	39	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:53 PM	13	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:53 PM	12	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:53 PM	20	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:53 PM	44	1337.00	XCSE
GENMAB A/S	31-Mar-2025	15:49:53 PM	9	1336.50	CEUX
GENMAB A/S	31-Mar-2025	15:49:53 PM	6	1336.50	CEUX
GENMAB A/S	31-Mar-2025	15:50:04 PM	1	1337.50	XCSE
GENMAB A/S	31-Mar-2025	15:50:04 PM	3	1337.50	XCSE
GENMAB A/S	31-Mar-2025	15:50:41 PM	79	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:50:41 PM	3	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:50:41 PM	61	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:50:41 PM	11	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:50:41 PM	23	1339.50	TQEX
GENMAB A/S	31-Mar-2025	15:50:41 PM	24	1339.50	AQEU
GENMAB A/S	31-Mar-2025	15:50:41 PM	80	1339.50	CEUX
GENMAB A/S	31-Mar-2025	15:51:00 PM	50	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:00 PM	39	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:51:00 PM	15	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:51:00 PM	2	1338.50	TQEX
GENMAB A/S	31-Mar-2025	15:51:01 PM	4	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:01 PM	13	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:07 PM	12	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:07 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:08 PM	1	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:16 PM	5	1339.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:18 PM	11	1339.50	XCSE
GENMAB A/S	31-Mar-2025	15:51:27 PM	14	1340.00	XCSE
GENMAB A/S	31-Mar-2025	15:51:31 PM	12	1340.00	CEUX
GENMAB A/S	31-Mar-2025	15:51:56 PM	2	1342.00	CEUX
GENMAB A/S	31-Mar-2025	15:51:56 PM	20	1342.00	CEUX
GENMAB A/S	31-Mar-2025	15:51:56 PM	36	1342.00	CEUX
GENMAB A/S	31-Mar-2025	15:51:58 PM	32	1342.00	CEUX
GENMAB A/S	31-Mar-2025	15:52:00 PM	15	1342.00	TQEX
GENMAB A/S	31-Mar-2025	15:52:00 PM	7	1342.00	TQEX
GENMAB A/S	31-Mar-2025	15:52:03 PM	83	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	29	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	41	1341.50	XCSE

39

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:52:03 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	10	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	28	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	39	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:03 PM	23	1341.00	TQEX
GENMAB A/S	31-Mar-2025	15:52:03 PM	72	1341.00	CEUX
GENMAB A/S	31-Mar-2025	15:52:03 PM	6	1341.00	CEUX
GENMAB A/S	31-Mar-2025	15:52:05 PM	18	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:05 PM	2	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:05 PM	28	1341.00	CEUX
GENMAB A/S	31-Mar-2025	15:52:06 PM	20	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:06 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:06 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:08 PM	1	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:08 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:52:22 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	15:53:26 PM	3	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:53:36 PM	12	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:53:36 PM	13	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:53:49 PM	78	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:53:49 PM	43	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:53:49 PM	43	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:53:49 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	15:54:01 PM	83	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:01 PM	42	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:01 PM	22	1343.50	TQEX
GENMAB A/S	31-Mar-2025	15:54:01 PM	23	1343.50	AQEU
GENMAB A/S	31-Mar-2025	15:54:01 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:54:01 PM	5	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:54:01 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:54:01 PM	83	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:54:03 PM	83	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:03 PM	18	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:54:03 PM	63	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:54:05 PM	1	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:08 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:09 PM	42	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:09 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:09 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:09 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:09 PM	24	1343.50	TQEX
GENMAB A/S	31-Mar-2025	15:54:09 PM	25	1343.50	AQEU
GENMAB A/S	31-Mar-2025	15:54:10 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:10 PM	11	1344.00	XCSE

40

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:54:10 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:25 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	39	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	30	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	9	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	3	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	22	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:37 PM	30	1344.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:47 PM	78	1343.50	XCSE
GENMAB A/S	31-Mar-2025	15:54:47 PM	18	1343.50	TQEX
GENMAB A/S	31-Mar-2025	15:54:47 PM	4	1343.50	TQEX
GENMAB A/S	31-Mar-2025	15:54:47 PM	77	1343.50	CEUX
GENMAB A/S	31-Mar-2025	15:55:02 PM	23	1344.50	AQEU
GENMAB A/S	31-Mar-2025	15:55:13 PM	18	1344.00	CEUX
GENMAB A/S	31-Mar-2025	15:56:02 PM	2	1346.50	XCSE
GENMAB A/S	31-Mar-2025	15:56:02 PM	3	1346.50	XCSE
GENMAB A/S	31-Mar-2025	15:56:02 PM	1	1346.50	XCSE
GENMAB A/S	31-Mar-2025	15:56:49 PM	1	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:56:49 PM	25	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:56:49 PM	9	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:56:49 PM	28	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:56:50 PM	36	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:56:50 PM	6	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:56:50 PM	5	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:56:50 PM	20	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:56:51 PM	10	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:56:54 PM	36	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:56:56 PM	36	1348.50	CEUX
GENMAB A/S	31-Mar-2025	15:57:00 PM	79	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:00 PM	41	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:00 PM	39	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:00 PM	19	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:00 PM	5	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:00 PM	29	1347.50	TQEX
GENMAB A/S	31-Mar-2025	15:57:00 PM	28	1347.50	AQEU
GENMAB A/S	31-Mar-2025	15:57:00 PM	35	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:57:00 PM	47	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:57:00 PM	34	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:57:02 PM	39	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:02 PM	31	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:03 PM	13	1347.50	XCSE

41

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:57:03 PM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:03 PM	39	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:03 PM	35	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:03 PM	81	1346.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:03 PM	23	1346.50	TQEX
GENMAB A/S	31-Mar-2025	15:57:03 PM	83	1346.50	CEUX
GENMAB A/S	31-Mar-2025	15:57:04 PM	21	1346.50	AQEU
GENMAB A/S	31-Mar-2025	15:57:05 PM	11	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:57:05 PM	4	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:57:05 PM	11	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:57:11 PM	44	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:57:11 PM	13	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:57:11 PM	39	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:57:11 PM	8	1347.00	XCSE
GENMAB A/S	31-Mar-2025	15:57:26 PM	30	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:26 PM	39	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:26 PM	35	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:57:26 PM	82	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:57:27 PM	8	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:04 PM	77	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:04 PM	31	1347.50	TQEX
GENMAB A/S	31-Mar-2025	15:58:04 PM	34	1347.50	AQEU
GENMAB A/S	31-Mar-2025	15:58:05 PM	41	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:05 PM	39	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:05 PM	24	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:05 PM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:05 PM	13	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:07 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:07 PM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:07 PM	18	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:58:37 PM	82	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:37 PM	43	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:37 PM	12	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:37 PM	24	1347.50	TQEX
GENMAB A/S	31-Mar-2025	15:58:37 PM	34	1347.50	AQEU
GENMAB A/S	31-Mar-2025	15:58:38 PM	30	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:38 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:38 PM	11	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:38 PM	30	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:46 PM	30	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:46 PM	13	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:46 PM	13	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:46 PM	30	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:46 PM	79	1346.50	XCSE
GENMAB A/S	31-Mar-2025	15:58:46 PM	18	1347.00	XCSE

42

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	15:58:46 PM	34	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:58:46 PM	22	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:58:46 PM	8	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:59:15 PM	30	1346.50	TQEX
GENMAB A/S	31-Mar-2025	15:59:23 PM	2	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:59:23 PM	6	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:59:23 PM	6	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:59:23 PM	32	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:59:24 PM	46	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:59:29 PM	42	1347.50	AQEU
GENMAB A/S	31-Mar-2025	15:59:30 PM	39	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:30 PM	30	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:30 PM	11	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:30 PM	10	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:30 PM	12	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:30 PM	2	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:34 PM	20	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:59:34 PM	2	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:59:38 PM	22	1347.00	TQEX
GENMAB A/S	31-Mar-2025	15:59:38 PM	43	1347.50	AQEU
GENMAB A/S	31-Mar-2025	15:59:41 PM	6	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:59:41 PM	6	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:59:41 PM	20	1348.00	CEUX
GENMAB A/S	31-Mar-2025	15:59:41 PM	81	1347.00	CEUX
GENMAB A/S	31-Mar-2025	15:59:41 PM	52	1347.50	AQEU
GENMAB A/S	31-Mar-2025	15:59:43 PM	79	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:59:48 PM	5	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:48 PM	12	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:48 PM	12	1348.00	XCSE
GENMAB A/S	31-Mar-2025	15:59:55 PM	80	1347.50	XCSE
GENMAB A/S	31-Mar-2025	15:59:55 PM	73	1347.50	CEUX
GENMAB A/S	31-Mar-2025	15:59:55 PM	53	1347.50	AQEU
GENMAB A/S	31-Mar-2025	16:00:00 PM	79	1346.50	XCSE
GENMAB A/S	31-Mar-2025	16:00:00 PM	35	1346.50	CEUX
GENMAB A/S	31-Mar-2025	16:00:00 PM	46	1346.50	CEUX
GENMAB A/S	31-Mar-2025	16:00:00 PM	2	1346.50	AQEU
GENMAB A/S	31-Mar-2025	16:00:04 PM	82	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:00:04 PM	13	1345.00	TQEX
GENMAB A/S	31-Mar-2025	16:00:04 PM	11	1345.00	TQEX
GENMAB A/S	31-Mar-2025	16:00:04 PM	81	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:00:04 PM	24	1345.50	AQEU
GENMAB A/S	31-Mar-2025	16:00:06 PM	10	1344.00	AQEU
GENMAB A/S	31-Mar-2025	16:00:25 PM	54	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:00:25 PM	22	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:00:25 PM	38	1344.00	CEUX

43

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:00:25 PM	19	1344.00	AQEU
GENMAB A/S	31-Mar-2025	16:00:26 PM	14	1344.00	AQEU
GENMAB A/S	31-Mar-2025	16:00:29 PM	20	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:00:29 PM	2	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:00:29 PM	43	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:01:09 PM	57	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:01:36 PM	38	1344.50	AQEU
GENMAB A/S	31-Mar-2025	16:01:49 PM	24	1344.00	TQEX
GENMAB A/S	31-Mar-2025	16:01:49 PM	51	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:01:49 PM	3	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:01:51 PM	62	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:01:51 PM	16	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:01:51 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:01:51 PM	47	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:01:51 PM	4	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:01:51 PM	41	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:02:17 PM	20	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:02:19 PM	43	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:19 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:19 PM	23	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:02:19 PM	30	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:02:21 PM	42	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:21 PM	30	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:21 PM	8	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:23 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:27 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:28 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:02:54 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:03:08 PM	6	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:03:11 PM	8	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:03:35 PM	78	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:35 PM	8	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:35 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:35 PM	14	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:03:35 PM	11	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:03:35 PM	80	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:03:35 PM	28	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:03:36 PM	30	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	39	1343.50	XCSE

44

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:03:36 PM	37	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:36 PM	4	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:37 PM	6	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:37 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:38 PM	19	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:38 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:38 PM	41	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:03:39 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:39 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:40 PM	30	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:41 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:41 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:41 PM	33	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:41 PM	8	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:03:42 PM	17	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:03:55 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:55 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:55 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:55 PM	14	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:55 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:03:55 PM	15	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:04:09 PM	66	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:04:09 PM	15	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:04:09 PM	26	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:04:43 PM	4	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:04:47 PM	22	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:04:47 PM	56	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:04:47 PM	23	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:04:47 PM	45	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:04:47 PM	35	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:04:51 PM	7	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:05:09 PM	78	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:05:09 PM	54	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:05:09 PM	29	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:05:09 PM	12	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:05:21 PM	23	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:06:00 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:06:04 PM	22	1344.00	TQEX
GENMAB A/S	31-Mar-2025	16:06:04 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:06:04 PM	36	1344.00	AQEU
GENMAB A/S	31-Mar-2025	16:06:25 PM	53	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:06:25 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:06:25 PM	23	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:06:25 PM	12	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:06:26 PM	13	1344.00	CEUX

45

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:06:39 PM	29	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:06:42 PM	67	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:06:42 PM	11	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:06:42 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:06:42 PM	20	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:06:43 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:06:43 PM	14	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:06:43 PM	28	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:06:44 PM	1	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:00 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:07:00 PM	22	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:07:05 PM	76	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:05 PM	22	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:07:05 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:07:05 PM	29	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:07:05 PM	22	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:07:05 PM	76	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:07:07 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:07 PM	22	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:07 PM	40	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:07:26 PM	2	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:32 PM	29	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:32 PM	21	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:54 PM	32	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:07:56 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:07:56 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:07:56 PM	39	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:07:56 PM	36	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:07:56 PM	5	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:07:56 PM	62	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:56 PM	19	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:56 PM	22	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:07:56 PM	80	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:07:57 PM	44	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:57 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:57 PM	15	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:07:57 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:08:00 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:08:00 PM	34	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:08:00 PM	31	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:08:01 PM	42	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:08:05 PM	27	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:08:05 PM	28	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:08:05 PM	24	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:08:05 PM	32	1342.00	XCSE

46

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:08:05 PM	6	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:08:26 PM	1	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:08:26 PM	3	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:08:55 PM	3	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:08:55 PM	10	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:09:03 PM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:09:05 PM	3	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:09:29 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:09:29 PM	36	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:09:48 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:09:48 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:09:49 PM	93	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:09:53 PM	47	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:09:53 PM	29	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:09:59 PM	33	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:10:01 PM	32	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:10:08 PM	41	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:08 PM	39	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:08 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:08 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:08 PM	20	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:10:25 PM	3	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:25 PM	14	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:25 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:25 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:10:49 PM	47	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:10:49 PM	31	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:10:49 PM	59	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:10:51 PM	25	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:11:13 PM	22	1342.50	AQEU
GENMAB A/S	31-Mar-2025	16:11:23 PM	14	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:11:24 PM	24	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:11:24 PM	18	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:11:25 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:11:25 PM	27	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:11:25 PM	36	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:11:25 PM	10	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:11:49 PM	31	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:12:08 PM	45	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:08 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:08 PM	7	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:08 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:08 PM	20	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:08 PM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:09 PM	1	1342.50	XCSE

47

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:12:09 PM	28	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:15 PM	76	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	36	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	5	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	40	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	3	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	2	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	17	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:12:15 PM	1	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:15 PM	6	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:15 PM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:15 PM	5	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:15 PM	6	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:18 PM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:12:39 PM	83	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:13:00 PM	21	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:19 PM	68	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:19 PM	8	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:19 PM	35	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:19 PM	2	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:19 PM	10	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:19 PM	47	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:13:19 PM	79	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:19 PM	23	1342.50	AQEU
GENMAB A/S	31-Mar-2025	16:13:21 PM	35	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:25 PM	3	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:25 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:25 PM	35	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:25 PM	3	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:25 PM	35	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:25 PM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:25 PM	30	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:26 PM	72	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:26 PM	72	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:26 PM	11	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:26 PM	10	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:27 PM	35	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	14	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	35	1342.50	XCSE

48

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:13:27 PM	31	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	35	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:27 PM	11	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:28 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:28 PM	21	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:33 PM	80	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:13:33 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:33 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:33 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:33 PM	36	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	36	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	4	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	68	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:34 PM	40	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:35 PM	32	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:35 PM	36	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:35 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:35 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:35 PM	14	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:44 PM	24	1341.50	TQEX
GENMAB A/S	31-Mar-2025	16:13:44 PM	50	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:44 PM	32	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:45 PM	36	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:45 PM	11	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:45 PM	21	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:13:49 PM	3	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:13:49 PM	80	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:05 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:14:05 PM	36	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:14:05 PM	29	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:14:11 PM	26	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:14:11 PM	57	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:14:42 PM	11	1344.00	XCSE

49

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:14:42 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	7	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:58 PM	16	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:14:58 PM	6	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:14:58 PM	3	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:14:59 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:59 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:14:59 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	15	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	2	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:05 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:07 PM	20	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:15:10 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:15:10 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:15:16 PM	11	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:15:39 PM	63	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:15:39 PM	22	1344.00	AQEU
GENMAB A/S	31-Mar-2025	16:15:53 PM	44	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:15:53 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:15:54 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:15:54 PM	15	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:15:55 PM	28	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:16:00 PM	1	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:16:00 PM	7	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:16:07 PM	77	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:16:25 PM	2	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:16:25 PM	11	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:16:26 PM	16	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:16:26 PM	2	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:16:48 PM	19	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:16:48 PM	3	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:16:59 PM	76	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:16:59 PM	82	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:17:26 PM	1	1343.00	XCSE

50

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:17:30 PM	30	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:17:39 PM	2	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:00 PM	31	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:18:10 PM	75	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	39	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	25	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	40	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	3	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	13	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	11	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	24	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	39	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	13	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	1	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:10 PM	20	1341.50	TQEX
GENMAB A/S	31-Mar-2025	16:18:10 PM	19	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:10 PM	56	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:10 PM	2	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:10 PM	20	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:11 PM	21	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:11 PM	14	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:13 PM	19	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:14 PM	3	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:18:14 PM	11	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:18:53 PM	78	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:19:00 PM	11	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:00 PM	21	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:00 PM	9	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:00 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:00 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:04 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:04 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:04 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:04 PM	7	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:04 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:04 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:04 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:04 PM	79	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:19:05 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	36	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	5	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	13	1343.50	XCSE

51

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:19:05 PM	26	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:05 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	30	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	25	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	26	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	1	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	38	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	36	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	30	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	26	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	5	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	26	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:06 PM	23	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:07 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:07 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:07 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:07 PM	29	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:25 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:25 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:25 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:25 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:25 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:25 PM	14	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:45 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:45 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:45 PM	17	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:45 PM	36	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:19:48 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:48 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:48 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:49 PM	23	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:19:51 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:20:08 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:20:08 PM	19	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:08 PM	58	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:22 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:20:22 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:20:22 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:20:22 PM	50	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:20:22 PM	6	1343.00	CEUX

52

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:20:22 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:22 PM	27	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:22 PM	22	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:22 PM	22	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:22 PM	22	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:22 PM	1	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:23 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:23 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:24 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:33 PM	27	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:20:33 PM	43	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:20:33 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:49 PM	2	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:20:51 PM	14	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:21:09 PM	80	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:09 PM	2	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:21:38 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:21:38 PM	5	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:21:38 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:21:38 PM	35	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:21:49 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:21:52 PM	44	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	20	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	28	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	20	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	49	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	2	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:52 PM	49	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:21:52 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:21:53 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	20	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	22	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:53 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:54 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:54 PM	15	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:54 PM	10	1344.00	XCSE

53

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:21:54 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:54 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:54 PM	10	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:56 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:56 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:21:57 PM	14	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:22:03 PM	82	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:22:03 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:22:03 PM	83	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:22:03 PM	22	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:22:13 PM	10	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:22:13 PM	73	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:22:13 PM	22	1344.00	AQEU
GENMAB A/S	31-Mar-2025	16:22:14 PM	19	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:22:14 PM	63	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:22:23 PM	37	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:22:24 PM	23	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:22:24 PM	2	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:22:24 PM	37	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:22:24 PM	43	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:22:24 PM	39	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:23:04 PM	27	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:23:09 PM	44	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:23:10 PM	5	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:23:10 PM	27	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:23:26 PM	2	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:23:26 PM	15	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:23:29 PM	27	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:23:30 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:30 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:30 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:30 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:30 PM	24	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:23:31 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:31 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:31 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:31 PM	10	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:31 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:31 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:31 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:31 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:32 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:32 PM	10	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:32 PM	2	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:23:32 PM	11	1344.00	XCSE

54

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:23:38 PM	49	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:23:38 PM	9	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:23:39 PM	59	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:23:39 PM	18	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:23:39 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:23:59 PM	79	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:23:59 PM	1	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:24:12 PM	30	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:24:12 PM	53	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:24:25 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:24:25 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:24:33 PM	50	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:24:39 PM	80	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:24:39 PM	36	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:24:45 PM	32	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:24:46 PM	44	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:24:46 PM	12	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:24:51 PM	24	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:51 PM	56	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:51 PM	10	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:24:51 PM	23	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:24:51 PM	22	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:24:52 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:52 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:52 PM	10	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:52 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:52 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:53 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:53 PM	10	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:24:59 PM	26	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:24:59 PM	35	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:24:59 PM	16	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:25:03 PM	48	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:03 PM	12	1341.50	TQEX
GENMAB A/S	31-Mar-2025	16:25:06 PM	22	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:06 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:11 PM	24	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:25:16 PM	34	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:25:16 PM	18	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:25:25 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:25 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:25 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:25 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:25 PM	24	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:25 PM	1	1342.50	XCSE

55

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:25:33 PM	18	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:25:35 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:35 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:48 PM	32	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:48 PM	24	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:25:49 PM	9	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:25:49 PM	71	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:26:14 PM	20	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:26:19 PM	46	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:19 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:19 PM	3	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:26:19 PM	9	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:26:26 PM	43	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:26 PM	29	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:26 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:26 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:27 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:27 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:28 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:28 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:30 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:30 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:30 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:30 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:30 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:30 PM	19	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:31 PM	26	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:26:32 PM	32	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:26:33 PM	10	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:34 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:34 PM	9	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:42 PM	31	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:26:43 PM	5	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:26:51 PM	5	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:26:51 PM	15	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:26:51 PM	22	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:26:51 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:26:51 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:26:51 PM	30	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:26:51 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:26:58 PM	22	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:26:58 PM	32	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:26:58 PM	40	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:27:03 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:27:03 PM	3	1343.00	XCSE

56

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:27:05 PM	1	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:27:06 PM	16	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:27:15 PM	4	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:19 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:28 PM	25	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:31 PM	8	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:34 PM	8	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:38 PM	8	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:40 PM	8	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:47 PM	8	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:47 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:47 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:48 PM	16	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:27:51 PM	26	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:27:51 PM	32	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:27:56 PM	78	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:28:02 PM	60	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:02 PM	22	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:28:02 PM	75	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:28:02 PM	22	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:28:05 PM	14	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:07 PM	57	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:07 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:07 PM	20	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:07 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:07 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:07 PM	19	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:07 PM	24	1342.00	TQEX
GENMAB A/S	31-Mar-2025	16:28:07 PM	59	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:28:07 PM	22	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:28:08 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:08 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:08 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:08 PM	20	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:08 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:08 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:08 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:08 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:13 PM	77	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:13 PM	40	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:28:15 PM	35	1342.00	TQEX
GENMAB A/S	31-Mar-2025	16:28:15 PM	7	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:28:15 PM	29	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:28:25 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:25 PM	30	1342.50	XCSE

57

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:28:25 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:25 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:26 PM	39	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:28:49 PM	78	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:50 PM	39	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:50 PM	19	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:50 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:28:50 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:04 PM	79	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:29:07 PM	13	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:29:14 PM	38	1341.50	TQEX
GENMAB A/S	31-Mar-2025	16:29:14 PM	19	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:29:14 PM	27	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:29:15 PM	36	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:25 PM	5	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:25 PM	1	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:25 PM	1	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:25 PM	2	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:25 PM	30	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:25 PM	35	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:49 PM	60	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:29:59 PM	83	1340.50	XCSE
GENMAB A/S	31-Mar-2025	16:29:59 PM	42	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:30:06 PM	18	1341.00	TQEX
GENMAB A/S	31-Mar-2025	16:30:06 PM	18	1341.00	TQEX
GENMAB A/S	31-Mar-2025	16:30:14 PM	41	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:30:14 PM	5	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:30:18 PM	11	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:30:25 PM	9	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:30:35 PM	15	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:30:39 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:30:40 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:30:40 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:30:40 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:30:55 PM	12	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:31:22 PM	77	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:31:25 PM	39	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:31:25 PM	8	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:31:25 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:31:25 PM	24	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:31:25 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:31:31 PM	36	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:31:31 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:31:31 PM	6	1343.00	CEUX
GENMAB A/S	31-Mar-2025	16:31:31 PM	7	1343.00	CEUX

58

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:31:32 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:31:32 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:31:56 PM	1	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:31:56 PM	31	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:31:57 PM	17	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:31:58 PM	5	1343.00	AQEU
GENMAB A/S	31-Mar-2025	16:32:03 PM	39	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:03 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:03 PM	39	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:03 PM	25	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:03 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:03 PM	36	1342.50	TQEX
GENMAB A/S	31-Mar-2025	16:32:03 PM	80	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:32:03 PM	1	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:32:06 PM	58	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:06 PM	25	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:50 PM	83	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:32:59 PM	83	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:33:07 PM	26	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:33:07 PM	4	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:33:07 PM	13	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:33:09 PM	18	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:33:27 PM	14	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:33:27 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:33:28 PM	18	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:33:28 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:33:28 PM	21	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:33:28 PM	22	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:33:28 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:33:42 PM	6	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:33:47 PM	26	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:34:03 PM	18	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:34:04 PM	57	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:34:15 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:34:15 PM	10	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:34:15 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:34:15 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:34:15 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:34:35 PM	40	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:34:35 PM	6	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:34:35 PM	24	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:34:35 PM	1	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:34:45 PM	77	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:34:45 PM	42	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:34:45 PM	2	1344.00	CEUX

59

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:34:45 PM	22	1344.00	AQEU
GENMAB A/S	31-Mar-2025	16:34:55 PM	25	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:35:03 PM	19	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:35:04 PM	3	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:35:23 PM	18	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:23 PM	24	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:23 PM	39	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:23 PM	12	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:23 PM	68	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:35:25 PM	22	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:35 PM	2	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:36 PM	13	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:42 PM	24	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:35:59 PM	23	1342.50	AQEU
GENMAB A/S	31-Mar-2025	16:36:00 PM	41	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:00 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:00 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:00 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:00 PM	36	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:36:00 PM	5	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:36:07 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:07 PM	63	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:36:07 PM	27	1342.00	TQEX
GENMAB A/S	31-Mar-2025	16:36:07 PM	55	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:36:12 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:12 PM	9	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:12 PM	2	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:12 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:14 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:31 PM	11	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:36:37 PM	47	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:45 PM	23	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:45 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:36:45 PM	25	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:37:11 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:37:19 PM	66	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:37:19 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:37:37 PM	16	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:37:37 PM	55	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:37:38 PM	36	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:37:40 PM	19	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:37:46 PM	31	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:37:46 PM	73	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:37:46 PM	13	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:37:46 PM	32	1344.50	CEUX

60

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:38:01 PM	12	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:38:01 PM	26	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:38:01 PM	14	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:38:01 PM	32	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:38:06 PM	98	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:38:06 PM	6	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:38:07 PM	35	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:38:11 PM	32	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:38:37 PM	79	1346.00	CEUX
GENMAB A/S	31-Mar-2025	16:39:09 PM	61	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:39:09 PM	36	1346.00	CEUX
GENMAB A/S	31-Mar-2025	16:39:26 PM	15	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:39:26 PM	41	1345.50	TQEX
GENMAB A/S	31-Mar-2025	16:39:26 PM	36	1346.00	CEUX
GENMAB A/S	31-Mar-2025	16:39:27 PM	30	1345.50	AQEU
GENMAB A/S	31-Mar-2025	16:39:59 PM	76	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	60	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	39	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	39	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	18	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:39:59 PM	34	1344.50	TQEX
GENMAB A/S	31-Mar-2025	16:39:59 PM	68	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:39:59 PM	23	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:39:59 PM	31	1344.50	AQEU
GENMAB A/S	31-Mar-2025	16:40:00 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:40:00 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:40:01 PM	31	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:40:01 PM	61	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:09 PM	16	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:10 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:40:23 PM	42	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:23 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:40:23 PM	29	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:40:23 PM	23	1344.50	AQEU
GENMAB A/S	31-Mar-2025	16:40:26 PM	76	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:40:29 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:29 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:31 PM	23	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:40:31 PM	16	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:40:33 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:40:34 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:34 PM	39	1344.50	XCSE

61

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:40:34 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:44 PM	20	1344.50	AQEU
GENMAB A/S	31-Mar-2025	16:40:45 PM	9	1344.50	AQEU
GENMAB A/S	31-Mar-2025	16:40:46 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:40:56 PM	30	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:06 PM	21	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:06 PM	29	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:06 PM	38	1344.50	TQEX
GENMAB A/S	31-Mar-2025	16:41:06 PM	30	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:19 PM	59	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:20 PM	8	1344.50	TQEX
GENMAB A/S	31-Mar-2025	16:41:34 PM	17	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:34 PM	5	1344.50	TQEX
GENMAB A/S	31-Mar-2025	16:41:34 PM	25	1344.50	TQEX
GENMAB A/S	31-Mar-2025	16:41:35 PM	2	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:35 PM	2	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:35 PM	14	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:35 PM	20	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:35 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:35 PM	23	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:35 PM	23	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:35 PM	23	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:35 PM	10	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:41:46 PM	43	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	30	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	31	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	5	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	37	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	77	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:46 PM	36	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:41:46 PM	47	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:41:47 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:47 PM	45	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:47 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:47 PM	8	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:47 PM	10	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:48 PM	10	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:52 PM	39	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:52 PM	12	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:41:52 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:42:01 PM	12	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:42:01 PM	11	1344.00	CEUX

62

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:42:05 PM	25	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:42:19 PM	78	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:42:19 PM	32	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:42:19 PM	30	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:42:31 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:42:31 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:42:31 PM	16	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:42:49 PM	25	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:42:49 PM	10	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:42:49 PM	32	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:42:49 PM	45	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:42:59 PM	77	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:42:59 PM	50	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:42:59 PM	50	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:43:03 PM	82	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:43:03 PM	34	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:43:03 PM	42	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:43:04 PM	11	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:43:04 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:43:04 PM	6	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:43:05 PM	13	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:43:06 PM	3	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:43:12 PM	22	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:12 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:12 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:27 PM	8	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:43:29 PM	82	1343.50	XCSE
GENMAB A/S	31-Mar-2025	16:43:31 PM	32	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:43:36 PM	30	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:36 PM	14	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:36 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:36 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:36 PM	9	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:37 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:37 PM	4	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:40 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:43:41 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:43:41 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:43:56 PM	27	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:43:59 PM	25	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:01 PM	2	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:44:14 PM	32	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:44:14 PM	18	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:44:16 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:44:17 PM	14	1343.50	AQEU

63

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:44:25 PM	22	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:25 PM	2	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:25 PM	23	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:31 PM	1	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:31 PM	11	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:31 PM	37	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:31 PM	9	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:44:55 PM	23	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:44:56 PM	30	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:44:59 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:44:59 PM	22	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:44:59 PM	49	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:45:11 PM	32	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:11 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:11 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:11 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:11 PM	4	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:11 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:11 PM	3	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:11 PM	18	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:45:11 PM	1	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:45:12 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:12 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:13 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:13 PM	39	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:13 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:13 PM	14	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:20 PM	48	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:20 PM	10	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:45:20 PM	5	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:45:25 PM	32	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:45:26 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:26 PM	18	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:31 PM	32	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:45:31 PM	11	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:45:33 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:58 PM	39	1344.00	XCSE

64

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:45:58 PM	50	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:58 PM	15	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:45:59 PM	24	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:45:59 PM	50	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:45:59 PM	20	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:46:19 PM	11	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:46:19 PM	35	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:46:24 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:46:28 PM	19	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:28 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:28 PM	12	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:28 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	39	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	38	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	3	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	42	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	13	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	18	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	12	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	15	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	4	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:29 PM	32	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:46:30 PM	19	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	38	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	23	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	16	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:30 PM	38	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:31 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:31 PM	39	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:31 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:31 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:31 PM	11	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:32 PM	22	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:36 PM	20	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:46:36 PM	7	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:46:59 PM	59	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:46:59 PM	36	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:46:59 PM	36	1344.50	CEUX
GENMAB A/S	31-Mar-2025	16:46:59 PM	15	1344.50	CEUX

65

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:47:13 PM	15	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:13 PM	29	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:13 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:13 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:13 PM	2	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:13 PM	14	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:13 PM	12	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:47:13 PM	9	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:47:13 PM	36	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:47:14 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:18 PM	37	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:18 PM	40	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:18 PM	27	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:18 PM	23	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:47:18 PM	28	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:47:18 PM	19	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:47:18 PM	3	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:47:19 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:19 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:20 PM	11	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:20 PM	11	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:20 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:21 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:21 PM	11	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:21 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:23 PM	13	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:23 PM	12	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:23 PM	39	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:24 PM	12	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:24 PM	12	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:24 PM	80	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:25 PM	11	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:28 PM	36	1345.50	TQEX
GENMAB A/S	31-Mar-2025	16:47:31 PM	34	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:32 PM	7	1345.50	XCSE
GENMAB A/S	31-Mar-2025	16:47:33 PM	18	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:47:33 PM	5	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:47:33 PM	16	1345.50	CEUX
GENMAB A/S	31-Mar-2025	16:47:47 PM	78	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:47 PM	43	1345.00	TQEX
GENMAB A/S	31-Mar-2025	16:47:47 PM	49	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:47:48 PM	41	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:49 PM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:49 PM	14	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:50 PM	11	1345.00	XCSE

66

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:47:50 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:50 PM	39	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:50 PM	13	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:51 PM	13	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:53 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	39	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	31	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	8	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:54 PM	11	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:55 PM	12	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:55 PM	39	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:55 PM	5	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:55 PM	39	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:47:58 PM	25	1345.00	CEUX
GENMAB A/S	31-Mar-2025	16:47:59 PM	46	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:48:00 PM	1	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:48:00 PM	3	1345.00	XCSE
GENMAB A/S	31-Mar-2025	16:48:03 PM	22	1344.50	AQEU
GENMAB A/S	31-Mar-2025	16:48:13 PM	40	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:48:13 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:48:13 PM	13	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:48:24 PM	4	1344.50	XCSE
GENMAB A/S	31-Mar-2025	16:48:24 PM	20	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:48:52 PM	32	1344.00	TQEX
GENMAB A/S	31-Mar-2025	16:48:52 PM	26	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:48:52 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:48:52 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:48:52 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:48:52 PM	28	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:48:52 PM	20	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:48:52 PM	17	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:48:58 PM	31	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:49:00 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:49:00 PM	3	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:49:00 PM	13	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:49:01 PM	29	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:49:10 PM	1	1344.00	XCSE
GENMAB A/S	31-Mar-2025	16:49:32 PM	36	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:49:32 PM	24	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:49:32 PM	10	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:49:33 PM	6	1344.00	CEUX

67

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:49:33 PM	5	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:49:33 PM	6	1344.00	CEUX
GENMAB A/S	31-Mar-2025	16:50:01 PM	35	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:01 PM	2	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:50:01 PM	2	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:50:01 PM	18	1343.50	TQEX
GENMAB A/S	31-Mar-2025	16:50:01 PM	37	1343.50	AQEU
GENMAB A/S	31-Mar-2025	16:50:03 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:03 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:03 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:03 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:04 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:05 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:05 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:06 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:06 PM	5	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:06 PM	50	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:06 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:06 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:07 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:07 PM	6	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:07 PM	27	1343.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:09 PM	30	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:09 PM	20	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:09 PM	39	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:09 PM	11	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:09 PM	4	1343.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:09 PM	22	1343.00	TQEX
GENMAB A/S	31-Mar-2025	16:50:09 PM	29	1342.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:11 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:11 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:12 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:12 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:12 PM	15	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:14 PM	29	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:14 PM	14	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:14 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:14 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:15 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:15 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:15 PM	10	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:15 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:15 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:15 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:15 PM	13	1342.50	XCSE

68

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:50:15 PM	24	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:50:16 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:16 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:16 PM	1	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:16 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:16 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:16 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:16 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:16 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:17 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:17 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:17 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:18 PM	13	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:18 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:18 PM	39	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:18 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:19 PM	14	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:19 PM	12	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:19 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:19 PM	6	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:19 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:19 PM	11	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:20 PM	1	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:20 PM	1	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:22 PM	80	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:22 PM	29	1342.00	TQEX
GENMAB A/S	31-Mar-2025	16:50:33 PM	26	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:34 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:34 PM	22	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:34 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:50:34 PM	23	1341.00	TQEX
GENMAB A/S	31-Mar-2025	16:50:40 PM	81	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:50:42 PM	9	1341.00	AQEU
GENMAB A/S	31-Mar-2025	16:50:43 PM	18	1341.00	AQEU
GENMAB A/S	31-Mar-2025	16:50:52 PM	8	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:52 PM	37	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:52 PM	35	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:53 PM	4	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:55 PM	5	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:58 PM	36	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:59 PM	22	1341.00	TQEX
GENMAB A/S	31-Mar-2025	16:50:59 PM	14	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:50:59 PM	2	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:51:13 PM	31	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:51:21 PM	11	1341.00	XCSE

69

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:51:21 PM	39	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:51:22 PM	65	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:51:28 PM	19	1341.00	AQEU
GENMAB A/S	31-Mar-2025	16:51:31 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:34 PM	50	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:36 PM	50	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:40 PM	50	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:41 PM	22	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:41 PM	50	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:41 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:43 PM	17	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:44 PM	50	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:45 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:45 PM	15	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:45 PM	1	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:51:45 PM	25	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:51:47 PM	25	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:47 PM	50	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:47 PM	16	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:48 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:48 PM	25	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:48 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:49 PM	82	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:51:49 PM	14	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:49 PM	39	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:49 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:49 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:49 PM	27	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:49 PM	29	1341.00	TQEX
GENMAB A/S	31-Mar-2025	16:51:49 PM	22	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:51:49 PM	10	1341.00	AQEU
GENMAB A/S	31-Mar-2025	16:51:50 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	12	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	39	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	36	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	39	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:50 PM	11	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:51 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:51 PM	39	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:51 PM	13	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:51 PM	36	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:51 PM	11	1341.50	XCSE

70

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:51:51 PM	39	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:51 PM	2	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:51:51 PM	25	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:51:51 PM	36	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:51:51 PM	6	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:51:51 PM	5	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:51:51 PM	22	1341.00	AQEU
GENMAB A/S	31-Mar-2025	16:51:55 PM	22	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:51:55 PM	18	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:01 PM	36	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:52:01 PM	26	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:52:05 PM	32	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:05 PM	38	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:05 PM	1	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:05 PM	3	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:19 PM	24	1341.00	TQEX
GENMAB A/S	31-Mar-2025	16:52:25 PM	36	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:52:25 PM	29	1341.00	AQEU
GENMAB A/S	31-Mar-2025	16:52:27 PM	25	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:27 PM	39	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:27 PM	11	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:27 PM	12	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:27 PM	13	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:27 PM	4	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:28 PM	7	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:28 PM	39	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:28 PM	13	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:28 PM	12	1341.00	XCSE
GENMAB A/S	31-Mar-2025	16:52:31 PM	50	1340.50	XCSE
GENMAB A/S	31-Mar-2025	16:52:31 PM	36	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:52:39 PM	41	1340.50	TQEX
GENMAB A/S	31-Mar-2025	16:52:39 PM	30	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:52:39 PM	32	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:52:47 PM	26	1340.50	XCSE
GENMAB A/S	31-Mar-2025	16:52:47 PM	32	1341.00	CEUX
GENMAB A/S	31-Mar-2025	16:53:05 PM	15	1340.50	XCSE
GENMAB A/S	31-Mar-2025	16:53:05 PM	30	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:53:19 PM	36	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:53:19 PM	23	1340.00	CEUX
GENMAB A/S	31-Mar-2025	16:53:28 PM	28	1340.50	AQEU
GENMAB A/S	31-Mar-2025	16:53:29 PM	35	1340.00	CEUX
GENMAB A/S	31-Mar-2025	16:53:44 PM	10	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:53:44 PM	18	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:53:44 PM	35	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:53:44 PM	8	1340.50	CEUX

71

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	31-Mar-2025	16:53:44 PM	18	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:53:44 PM	15	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:53:45 PM	18	1340.50	CEUX
GENMAB A/S	31-Mar-2025	16:54:10 PM	83	1341.50	CEUX
GENMAB A/S	31-Mar-2025	16:54:20 PM	40	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:54:20 PM	24	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:54:20 PM	45	1342.00	TQEX
GENMAB A/S	31-Mar-2025	16:54:20 PM	41	1342.00	CEUX
GENMAB A/S	31-Mar-2025	16:54:20 PM	22	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:54:20 PM	14	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:54:29 PM	22	1342.00	TQEX
GENMAB A/S	31-Mar-2025	16:54:29 PM	26	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:54:43 PM	30	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:54:43 PM	12	1342.00	XCSE
GENMAB A/S	31-Mar-2025	16:54:43 PM	27	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:54:43 PM	35	1342.50	XCSE
GENMAB A/S	31-Mar-2025	16:54:46 PM	55	1341.50	XCSE
GENMAB A/S	31-Mar-2025	16:54:46 PM	17	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:54:46 PM	5	1342.00	AQEU
GENMAB A/S	31-Mar-2025	16:54:46 PM	10	1342.50	AQEU
GENMAB A/S	31-Mar-2025	16:54:46 PM	13	1342.50	AQEU
GENMAB A/S	31-Mar-2025	16:54:46 PM	21	1342.50	AQEU
GENMAB A/S	01-Apr-2025	09:12:57 AM	74	1271.50	XCSE
GENMAB A/S	01-Apr-2025	09:13:14 AM	47	1272.00	XCSE
GENMAB A/S	01-Apr-2025	09:13:14 AM	72	1272.00	CEUX
GENMAB A/S	01-Apr-2025	09:13:29 AM	27	1276.00	CEUX
GENMAB A/S	01-Apr-2025	09:13:38 AM	74	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:13:50 AM	54	1277.50	XCSE
GENMAB A/S	01-Apr-2025	09:13:50 AM	1	1277.50	AQEU
GENMAB A/S	01-Apr-2025	09:13:50 AM	1	1277.50	AQEU
GENMAB A/S	01-Apr-2025	09:14:05 AM	54	1280.00	XCSE
GENMAB A/S	01-Apr-2025	09:14:05 AM	68	1280.50	AQEU
GENMAB A/S	01-Apr-2025	09:14:20 AM	60	1285.00	XCSE
GENMAB A/S	01-Apr-2025	09:14:23 AM	51	1284.00	XCSE
GENMAB A/S	01-Apr-2025	09:14:23 AM	55	1283.00	XCSE
GENMAB A/S	01-Apr-2025	09:14:23 AM	67	1283.50	TQEX
GENMAB A/S	01-Apr-2025	09:14:23 AM	48	1284.00	AQEU
GENMAB A/S	01-Apr-2025	09:14:23 AM	46	1283.00	AQEU
GENMAB A/S	01-Apr-2025	09:14:23 AM	40	1284.00	CEUX
GENMAB A/S	01-Apr-2025	09:14:23 AM	39	1283.00	CEUX
GENMAB A/S	01-Apr-2025	09:14:29 AM	26	1281.50	XCSE
GENMAB A/S	01-Apr-2025	09:14:29 AM	75	1282.00	TQEX
GENMAB A/S	01-Apr-2025	09:14:29 AM	34	1282.00	AQEU
GENMAB A/S	01-Apr-2025	09:14:29 AM	41	1282.00	CEUX
GENMAB A/S	01-Apr-2025	09:14:29 AM	28	1281.00	CEUX

72

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	09:14:34 AM	36	1280.50	TQEX
GENMAB A/S	01-Apr-2025	09:14:34 AM	37	1280.50	TQEX
GENMAB A/S	01-Apr-2025	09:14:42 AM	25	1282.00	XCSE
GENMAB A/S	01-Apr-2025	09:15:05 AM	23	1281.00	XCSE
GENMAB A/S	01-Apr-2025	09:15:05 AM	38	1281.00	CEUX
GENMAB A/S	01-Apr-2025	09:15:40 AM	3	1281.00	XCSE
GENMAB A/S	01-Apr-2025	09:15:40 AM	39	1281.00	XCSE
GENMAB A/S	01-Apr-2025	09:15:40 AM	38	1281.00	CEUX
GENMAB A/S	01-Apr-2025	09:15:52 AM	23	1280.00	XCSE
GENMAB A/S	01-Apr-2025	09:15:52 AM	25	1280.00	CEUX
GENMAB A/S	01-Apr-2025	09:17:26 AM	79	1281.00	XCSE
GENMAB A/S	01-Apr-2025	09:17:26 AM	53	1280.50	CEUX
GENMAB A/S	01-Apr-2025	09:18:09 AM	24	1280.00	XCSE
GENMAB A/S	01-Apr-2025	09:18:15 AM	43	1280.00	XCSE
GENMAB A/S	01-Apr-2025	09:18:23 AM	23	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:18:25 AM	18	1278.50	XCSE
GENMAB A/S	01-Apr-2025	09:18:31 AM	5	1278.50	XCSE
GENMAB A/S	01-Apr-2025	09:19:06 AM	10	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:19:06 AM	11	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:19:06 AM	61	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:19:20 AM	81	1280.00	XCSE
GENMAB A/S	01-Apr-2025	09:19:48 AM	9	1281.50	XCSE
GENMAB A/S	01-Apr-2025	09:19:48 AM	12	1281.50	XCSE
GENMAB A/S	01-Apr-2025	09:20:04 AM	48	1283.50	XCSE
GENMAB A/S	01-Apr-2025	09:20:04 AM	12	1283.50	XCSE
GENMAB A/S	01-Apr-2025	09:20:04 AM	11	1283.50	XCSE
GENMAB A/S	01-Apr-2025	09:20:04 AM	10	1283.50	XCSE
GENMAB A/S	01-Apr-2025	09:20:15 AM	15	1283.50	XCSE
GENMAB A/S	01-Apr-2025	09:20:21 AM	86	1284.00	XCSE
GENMAB A/S	01-Apr-2025	09:20:29 AM	13	1283.00	XCSE
GENMAB A/S	01-Apr-2025	09:20:29 AM	67	1283.00	XCSE
GENMAB A/S	01-Apr-2025	09:20:29 AM	64	1283.00	CEUX
GENMAB A/S	01-Apr-2025	09:20:29 AM	13	1283.00	CEUX
GENMAB A/S	01-Apr-2025	09:20:48 AM	80	1282.00	XCSE
GENMAB A/S	01-Apr-2025	09:20:48 AM	49	1282.50	CEUX
GENMAB A/S	01-Apr-2025	09:21:03 AM	73	1281.50	CEUX
GENMAB A/S	01-Apr-2025	09:21:28 AM	5	1282.00	XCSE
GENMAB A/S	01-Apr-2025	09:21:28 AM	80	1282.00	XCSE
GENMAB A/S	01-Apr-2025	09:21:28 AM	39	1282.00	CEUX
GENMAB A/S	01-Apr-2025	09:21:52 AM	81	1282.00	XCSE
GENMAB A/S	01-Apr-2025	09:21:52 AM	85	1281.00	XCSE
GENMAB A/S	01-Apr-2025	09:21:52 AM	29	1281.50	CEUX
GENMAB A/S	01-Apr-2025	09:22:06 AM	8	1280.50	CEUX
GENMAB A/S	01-Apr-2025	09:22:06 AM	57	1280.50	CEUX
GENMAB A/S	01-Apr-2025	09:22:31 AM	64	1281.00	XCSE

73

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	09:22:34 AM	14	1281.00	XCSE
GENMAB A/S	01-Apr-2025	09:22:44 AM	28	1280.50	CEUX
GENMAB A/S	01-Apr-2025	09:23:23 AM	79	1280.50	XCSE
GENMAB A/S	01-Apr-2025	09:23:35 AM	81	1279.50	XCSE
GENMAB A/S	01-Apr-2025	09:23:36 AM	35	1279.50	CEUX
GENMAB A/S	01-Apr-2025	09:24:57 AM	85	1281.00	XCSE
GENMAB A/S	01-Apr-2025	09:24:59 AM	24	1280.50	CEUX
GENMAB A/S	01-Apr-2025	09:24:59 AM	29	1280.50	CEUX
GENMAB A/S	01-Apr-2025	09:26:25 AM	7	1280.50	XCSE
GENMAB A/S	01-Apr-2025	09:26:28 AM	72	1280.00	XCSE
GENMAB A/S	01-Apr-2025	09:26:28 AM	46	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:26:28 AM	27	1280.00	TQEX
GENMAB A/S	01-Apr-2025	09:26:28 AM	17	1279.50	CEUX
GENMAB A/S	01-Apr-2025	09:26:28 AM	41	1279.50	CEUX
GENMAB A/S	01-Apr-2025	09:26:29 AM	34	1279.50	CEUX
GENMAB A/S	01-Apr-2025	09:26:29 AM	16	1279.50	CEUX
GENMAB A/S	01-Apr-2025	09:26:32 AM	78	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:26:32 AM	1	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:26:55 AM	37	1278.50	TQEX
GENMAB A/S	01-Apr-2025	09:26:55 AM	32	1278.50	CEUX
GENMAB A/S	01-Apr-2025	09:27:18 AM	81	1278.00	XCSE
GENMAB A/S	01-Apr-2025	09:27:18 AM	33	1278.00	TQEX
GENMAB A/S	01-Apr-2025	09:27:18 AM	48	1278.50	CEUX
GENMAB A/S	01-Apr-2025	09:27:18 AM	14	1277.00	CEUX
GENMAB A/S	01-Apr-2025	09:27:18 AM	10	1277.00	CEUX
GENMAB A/S	01-Apr-2025	09:27:52 AM	54	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:27:52 AM	29	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:27:52 AM	62	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:28:56 AM	85	1279.50	XCSE
GENMAB A/S	01-Apr-2025	09:28:56 AM	34	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:28:56 AM	25	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:28:59 AM	16	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:28:59 AM	69	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:30:07 AM	81	1280.50	XCSE
GENMAB A/S	01-Apr-2025	09:30:07 AM	84	1279.50	XCSE
GENMAB A/S	01-Apr-2025	09:30:07 AM	38	1279.50	TQEX
GENMAB A/S	01-Apr-2025	09:30:07 AM	75	1280.50	CEUX
GENMAB A/S	01-Apr-2025	09:30:07 AM	8	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:30:07 AM	15	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:30:07 AM	53	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:30:10 AM	31	1279.00	TQEX
GENMAB A/S	01-Apr-2025	09:30:28 AM	77	1281.50	XCSE
GENMAB A/S	01-Apr-2025	09:30:28 AM	8	1280.50	XCSE
GENMAB A/S	01-Apr-2025	09:30:28 AM	19	1281.00	CEUX
GENMAB A/S	01-Apr-2025	09:30:28 AM	23	1281.00	CEUX

74

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	09:30:34 AM	55	1280.50	XCSE
GENMAB A/S	01-Apr-2025	09:30:34 AM	23	1280.00	CEUX
GENMAB A/S	01-Apr-2025	09:30:46 AM	35	1280.00	XCSE
GENMAB A/S	01-Apr-2025	09:30:56 AM	42	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:30:56 AM	8	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:31:17 AM	17	1279.50	TQEX
GENMAB A/S	01-Apr-2025	09:31:24 AM	32	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:31:24 AM	1	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:31:24 AM	30	1279.00	CEUX
GENMAB A/S	01-Apr-2025	09:31:44 AM	5	1279.50	CEUX
GENMAB A/S	01-Apr-2025	09:31:44 AM	21	1279.50	CEUX
GENMAB A/S	01-Apr-2025	09:31:53 AM	23	1279.00	XCSE
GENMAB A/S	01-Apr-2025	09:32:04 AM	26	1278.50	CEUX
GENMAB A/S	01-Apr-2025	09:33:33 AM	29	1278.50	CEUX
GENMAB A/S	01-Apr-2025	09:33:40 AM	18	1278.50	CEUX
GENMAB A/S	01-Apr-2025	09:33:58 AM	25	1278.00	XCSE
GENMAB A/S	01-Apr-2025	09:33:58 AM	27	1278.50	CEUX
GENMAB A/S	01-Apr-2025	09:33:58 AM	4	1278.50	CEUX
GENMAB A/S	01-Apr-2025	09:33:58 AM	3	1277.50	CEUX
GENMAB A/S	01-Apr-2025	09:33:58 AM	24	1277.50	CEUX
GENMAB A/S	01-Apr-2025	09:34:36 AM	27	1277.50	XCSE
GENMAB A/S	01-Apr-2025	09:34:36 AM	54	1277.50	XCSE
GENMAB A/S	01-Apr-2025	09:34:40 AM	9	1277.00	CEUX
GENMAB A/S	01-Apr-2025	09:34:40 AM	20	1277.00	CEUX
GENMAB A/S	01-Apr-2025	09:34:54 AM	41	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:34:54 AM	27	1276.00	CEUX
GENMAB A/S	01-Apr-2025	09:34:55 AM	37	1275.50	XCSE
GENMAB A/S	01-Apr-2025	09:34:58 AM	2	1275.50	XCSE
GENMAB A/S	01-Apr-2025	09:34:58 AM	17	1275.50	XCSE
GENMAB A/S	01-Apr-2025	09:35:14 AM	86	1275.00	XCSE
GENMAB A/S	01-Apr-2025	09:35:18 AM	79	1274.00	XCSE
GENMAB A/S	01-Apr-2025	09:35:18 AM	35	1274.50	TQEX
GENMAB A/S	01-Apr-2025	09:35:18 AM	30	1274.50	CEUX
GENMAB A/S	01-Apr-2025	09:35:35 AM	34	1275.50	TQEX
GENMAB A/S	01-Apr-2025	09:35:37 AM	39	1275.00	XCSE
GENMAB A/S	01-Apr-2025	09:35:54 AM	23	1275.00	CEUX
GENMAB A/S	01-Apr-2025	09:36:58 AM	86	1277.50	XCSE
GENMAB A/S	01-Apr-2025	09:36:58 AM	18	1277.00	CEUX
GENMAB A/S	01-Apr-2025	09:36:58 AM	15	1277.00	CEUX
GENMAB A/S	01-Apr-2025	09:36:58 AM	29	1277.00	AQEU
GENMAB A/S	01-Apr-2025	09:37:00 AM	66	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:37:00 AM	3	1276.00	CEUX
GENMAB A/S	01-Apr-2025	09:37:00 AM	29	1276.00	CEUX
GENMAB A/S	01-Apr-2025	09:37:00 AM	32	1276.00	AQEU
GENMAB A/S	01-Apr-2025	09:38:03 AM	55	1276.00	XCSE

75

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	09:38:03 AM	27	1276.00	CEUX
GENMAB A/S	01-Apr-2025	09:38:03 AM	28	1276.00	AQEU
GENMAB A/S	01-Apr-2025	09:38:15 AM	64	1275.00	XCSE
GENMAB A/S	01-Apr-2025	09:38:15 AM	31	1275.00	CEUX
GENMAB A/S	01-Apr-2025	09:38:40 AM	50	1274.00	XCSE
GENMAB A/S	01-Apr-2025	09:38:40 AM	23	1274.00	CEUX
GENMAB A/S	01-Apr-2025	09:39:05 AM	43	1275.00	XCSE
GENMAB A/S	01-Apr-2025	09:39:05 AM	28	1275.00	CEUX
GENMAB A/S	01-Apr-2025	09:39:40 AM	11	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:39:40 AM	23	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:39:40 AM	9	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:39:40 AM	7	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:39:49 AM	1	1277.50	CEUX
GENMAB A/S	01-Apr-2025	09:39:53 AM	34	1277.50	CEUX
GENMAB A/S	01-Apr-2025	09:39:55 AM	26	1276.50	XCSE
GENMAB A/S	01-Apr-2025	09:40:18 AM	26	1280.50	XCSE
GENMAB A/S	01-Apr-2025	09:40:18 AM	20	1280.50	XCSE
GENMAB A/S	01-Apr-2025	09:40:18 AM	30	1280.50	AQEU
GENMAB A/S	01-Apr-2025	09:40:18 AM	3	1280.50	AQEU
GENMAB A/S	01-Apr-2025	09:41:48 AM	83	1284.00	XCSE
GENMAB A/S	01-Apr-2025	09:41:48 AM	28	1285.50	XCSE
GENMAB A/S	01-Apr-2025	09:41:48 AM	25	1286.00	XCSE
GENMAB A/S	01-Apr-2025	09:41:54 AM	33	1285.00	XCSE
GENMAB A/S	01-Apr-2025	09:41:54 AM	29	1284.50	TQEX
GENMAB A/S	01-Apr-2025	09:41:55 AM	56	1284.00	XCSE
GENMAB A/S	01-Apr-2025	09:41:55 AM	50	1284.00	CEUX
GENMAB A/S	01-Apr-2025	09:41:58 AM	23	1283.00	XCSE
GENMAB A/S	01-Apr-2025	09:41:58 AM	26	1283.50	TQEX
GENMAB A/S	01-Apr-2025	09:41:58 AM	56	1283.00	CEUX
GENMAB A/S	01-Apr-2025	09:42:21 AM	31	1282.50	AQEU
GENMAB A/S	01-Apr-2025	09:42:21 AM	11	1282.50	AQEU
GENMAB A/S	01-Apr-2025	09:43:03 AM	29	1284.50	XCSE
GENMAB A/S	01-Apr-2025	09:43:31 AM	18	1285.00	TQEX
GENMAB A/S	01-Apr-2025	09:43:31 AM	9	1285.00	TQEX
GENMAB A/S	01-Apr-2025	09:43:31 AM	32	1285.00	CEUX
GENMAB A/S	01-Apr-2025	09:43:59 AM	30	1284.50	XCSE
GENMAB A/S	01-Apr-2025	09:43:59 AM	26	1284.50	AQEU
GENMAB A/S	01-Apr-2025	09:44:01 AM	25	1284.00	CEUX
GENMAB A/S	01-Apr-2025	09:44:08 AM	29	1283.50	XCSE
GENMAB A/S	01-Apr-2025	09:44:08 AM	23	1283.00	CEUX
GENMAB A/S	01-Apr-2025	09:44:08 AM	25	1283.00	AQEU
GENMAB A/S	01-Apr-2025	09:44:11 AM	26	1282.00	XCSE
GENMAB A/S	01-Apr-2025	09:44:11 AM	28	1282.00	CEUX
GENMAB A/S	01-Apr-2025	09:44:33 AM	29	1282.50	CEUX
GENMAB A/S	01-Apr-2025	09:46:24 AM	27	1282.50	TQEX

76

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	09:46:55 AM	81	1283.00	XCSE
GENMAB A/S	01-Apr-2025	09:46:55 AM	30	1282.00	XCSE
GENMAB A/S	01-Apr-2025	09:46:56 AM	77	1282.50	XCSE
GENMAB A/S	01-Apr-2025	09:46:56 AM	16	1282.50	CEUX
GENMAB A/S	01-Apr-2025	09:46:56 AM	33	1282.50	CEUX
GENMAB A/S	01-Apr-2025	09:48:05 AM	86	1285.00	XCSE
GENMAB A/S	01-Apr-2025	09:48:31 AM	60	1286.50	XCSE
GENMAB A/S	01-Apr-2025	09:48:31 AM	23	1286.50	TQEX
GENMAB A/S	01-Apr-2025	09:48:31 AM	19	1286.50	CEUX
GENMAB A/S	01-Apr-2025	09:48:31 AM	15	1286.50	CEUX
GENMAB A/S	01-Apr-2025	09:48:31 AM	15	1286.50	CEUX
GENMAB A/S	01-Apr-2025	09:48:33 AM	40	1287.00	XCSE
GENMAB A/S	01-Apr-2025	09:49:33 AM	23	1286.50	CEUX
GENMAB A/S	01-Apr-2025	09:49:52 AM	13	1285.50	XCSE
GENMAB A/S	01-Apr-2025	09:49:52 AM	54	1285.50	XCSE
GENMAB A/S	01-Apr-2025	09:49:52 AM	45	1285.50	CEUX
GENMAB A/S	01-Apr-2025	09:50:26 AM	43	1288.50	CEUX
GENMAB A/S	01-Apr-2025	09:51:11 AM	81	1288.50	XCSE
GENMAB A/S	01-Apr-2025	09:53:12 AM	9	1287.50	XCSE
GENMAB A/S	01-Apr-2025	09:53:12 AM	23	1288.00	TQEX
GENMAB A/S	01-Apr-2025	09:53:12 AM	37	1288.00	CEUX
GENMAB A/S	01-Apr-2025	09:53:18 AM	54	1287.50	XCSE
GENMAB A/S	01-Apr-2025	09:53:18 AM	3	1287.50	XCSE
GENMAB A/S	01-Apr-2025	09:53:27 AM	46	1287.00	CEUX
GENMAB A/S	01-Apr-2025	09:53:27 AM	32	1287.00	AQEU
GENMAB A/S	01-Apr-2025	09:55:13 AM	5	1287.50	XCSE
GENMAB A/S	01-Apr-2025	09:55:14 AM	2	1287.50	XCSE
GENMAB A/S	01-Apr-2025	09:55:23 AM	23	1288.00	XCSE
GENMAB A/S	01-Apr-2025	09:56:01 AM	4	1288.00	XCSE
GENMAB A/S	01-Apr-2025	09:56:55 AM	5	1287.50	AQEU
GENMAB A/S	01-Apr-2025	09:57:02 AM	23	1289.50	XCSE
GENMAB A/S	01-Apr-2025	09:57:02 AM	26	1289.50	XCSE
GENMAB A/S	01-Apr-2025	09:57:02 AM	38	1289.50	XCSE
GENMAB A/S	01-Apr-2025	09:57:05 AM	80	1290.50	XCSE
GENMAB A/S	01-Apr-2025	09:57:05 AM	23	1290.00	TQEX
GENMAB A/S	01-Apr-2025	09:57:05 AM	86	1290.00	CEUX
GENMAB A/S	01-Apr-2025	09:57:10 AM	65	1291.00	CEUX
GENMAB A/S	01-Apr-2025	09:57:33 AM	82	1290.50	XCSE
GENMAB A/S	01-Apr-2025	09:57:33 AM	17	1290.50	AQEU
GENMAB A/S	01-Apr-2025	09:57:44 AM	23	1290.50	TQEX
GENMAB A/S	01-Apr-2025	09:57:44 AM	15	1290.50	AQEU
GENMAB A/S	01-Apr-2025	09:58:30 AM	40	1290.00	CEUX
GENMAB A/S	01-Apr-2025	09:58:31 AM	7	1290.50	XCSE
GENMAB A/S	01-Apr-2025	09:59:30 AM	80	1289.50	XCSE
GENMAB A/S	01-Apr-2025	09:59:30 AM	27	1289.50	AQEU

77

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	09:59:31 AM	34	1290.00	XCSE
GENMAB A/S	01-Apr-2025	09:59:33 AM	8	1289.50	TQEX
GENMAB A/S	01-Apr-2025	10:00:23 AM	20	1289.50	AQEU
GENMAB A/S	01-Apr-2025	10:00:31 AM	3	1289.50	AQEU
GENMAB A/S	01-Apr-2025	10:00:34 AM	28	1289.50	XCSE
GENMAB A/S	01-Apr-2025	10:00:34 AM	30	1289.50	XCSE
GENMAB A/S	01-Apr-2025	10:00:34 AM	26	1289.50	XCSE
GENMAB A/S	01-Apr-2025	10:00:34 AM	10	1289.50	XCSE
GENMAB A/S	01-Apr-2025	10:00:34 AM	14	1289.50	XCSE
GENMAB A/S	01-Apr-2025	10:00:34 AM	81	1288.00	XCSE
GENMAB A/S	01-Apr-2025	10:00:34 AM	84	1289.00	CEUX
GENMAB A/S	01-Apr-2025	10:00:35 AM	52	1288.00	CEUX
GENMAB A/S	01-Apr-2025	10:01:00 AM	60	1287.50	XCSE
GENMAB A/S	01-Apr-2025	10:01:16 AM	85	1288.50	XCSE
GENMAB A/S	01-Apr-2025	10:01:33 AM	49	1288.00	CEUX
GENMAB A/S	01-Apr-2025	10:02:01 AM	21	1288.00	CEUX
GENMAB A/S	01-Apr-2025	10:02:02 AM	30	1287.50	TQEX
GENMAB A/S	01-Apr-2025	10:02:02 AM	12	1288.00	CEUX
GENMAB A/S	01-Apr-2025	10:02:02 AM	9	1288.00	CEUX
GENMAB A/S	01-Apr-2025	10:02:40 AM	19	1287.50	XCSE
GENMAB A/S	01-Apr-2025	10:02:40 AM	5	1287.50	XCSE
GENMAB A/S	01-Apr-2025	10:02:41 AM	23	1287.00	CEUX
GENMAB A/S	01-Apr-2025	10:02:44 AM	84	1286.50	XCSE
GENMAB A/S	01-Apr-2025	10:04:45 AM	68	1288.50	XCSE
GENMAB A/S	01-Apr-2025	10:04:45 AM	32	1289.00	XCSE
GENMAB A/S	01-Apr-2025	10:04:45 AM	8	1289.00	XCSE
GENMAB A/S	01-Apr-2025	10:05:01 AM	80	1288.00	XCSE
GENMAB A/S	01-Apr-2025	10:05:01 AM	4	1288.00	CEUX
GENMAB A/S	01-Apr-2025	10:05:01 AM	56	1288.00	CEUX
GENMAB A/S	01-Apr-2025	10:09:15 AM	8	1294.50	AQEU
GENMAB A/S	01-Apr-2025	10:09:27 AM	38	1295.50	XCSE
GENMAB A/S	01-Apr-2025	10:09:42 AM	38	1295.50	XCSE
GENMAB A/S	01-Apr-2025	10:09:42 AM	19	1295.50	XCSE
GENMAB A/S	01-Apr-2025	10:09:42 AM	15	1295.50	XCSE
GENMAB A/S	01-Apr-2025	10:09:42 AM	83	1295.00	CEUX
GENMAB A/S	01-Apr-2025	10:09:43 AM	3	1295.50	XCSE
GENMAB A/S	01-Apr-2025	10:10:03 AM	94	1296.00	XCSE
GENMAB A/S	01-Apr-2025	10:10:03 AM	14	1296.00	XCSE
GENMAB A/S	01-Apr-2025	10:10:14 AM	86	1296.00	CEUX
GENMAB A/S	01-Apr-2025	10:10:47 AM	86	1295.50	XCSE
GENMAB A/S	01-Apr-2025	10:10:47 AM	31	1295.50	TQEX
GENMAB A/S	01-Apr-2025	10:10:47 AM	27	1295.50	AQEU
GENMAB A/S	01-Apr-2025	10:11:05 AM	34	1299.00	XCSE
GENMAB A/S	01-Apr-2025	10:11:05 AM	74	1299.00	XCSE
GENMAB A/S	01-Apr-2025	10:11:20 AM	10	1299.00	XCSE

78

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	10:11:43 AM	62	1298.50	XCSE
GENMAB A/S	01-Apr-2025	10:11:46 AM	31	1300.00	XCSE
GENMAB A/S	01-Apr-2025	10:11:46 AM	16	1300.00	XCSE
GENMAB A/S	01-Apr-2025	10:12:06 AM	28	1303.00	TQEX
GENMAB A/S	01-Apr-2025	10:12:16 AM	81	1302.00	XCSE
GENMAB A/S	01-Apr-2025	10:12:16 AM	23	1302.00	TQEX
GENMAB A/S	01-Apr-2025	10:12:16 AM	80	1301.50	CEUX
GENMAB A/S	01-Apr-2025	10:12:16 AM	24	1302.50	AQEU
GENMAB A/S	01-Apr-2025	10:12:18 AM	28	1301.00	XCSE
GENMAB A/S	01-Apr-2025	10:12:18 AM	54	1301.00	XCSE
GENMAB A/S	01-Apr-2025	10:12:25 AM	25	1300.00	CEUX
GENMAB A/S	01-Apr-2025	10:13:06 AM	18	1300.50	XCSE
GENMAB A/S	01-Apr-2025	10:14:05 AM	83	1302.50	XCSE
GENMAB A/S	01-Apr-2025	10:14:27 AM	29	1304.00	XCSE
GENMAB A/S	01-Apr-2025	10:14:27 AM	52	1304.00	XCSE
GENMAB A/S	01-Apr-2025	10:14:30 AM	15	1303.50	AQEU
GENMAB A/S	01-Apr-2025	10:14:30 AM	26	1303.50	AQEU
GENMAB A/S	01-Apr-2025	10:15:38 AM	5	1305.00	XCSE
GENMAB A/S	01-Apr-2025	10:15:38 AM	80	1305.00	XCSE
GENMAB A/S	01-Apr-2025	10:15:38 AM	41	1305.00	CEUX
GENMAB A/S	01-Apr-2025	10:15:38 AM	44	1305.00	CEUX
GENMAB A/S	01-Apr-2025	10:16:00 AM	35	1306.00	CEUX
GENMAB A/S	01-Apr-2025	10:16:00 AM	50	1306.00	CEUX
GENMAB A/S	01-Apr-2025	10:16:04 AM	33	1305.50	TQEX
GENMAB A/S	01-Apr-2025	10:16:11 AM	84	1305.00	XCSE
GENMAB A/S	01-Apr-2025	10:16:11 AM	79	1304.00	XCSE
GENMAB A/S	01-Apr-2025	10:16:11 AM	81	1305.00	CEUX
GENMAB A/S	01-Apr-2025	10:16:11 AM	85	1304.00	CEUX
GENMAB A/S	01-Apr-2025	10:19:04 AM	13	1309.50	XCSE
GENMAB A/S	01-Apr-2025	10:19:18 AM	80	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:19:26 AM	33	1310.50	AQEU
GENMAB A/S	01-Apr-2025	10:19:47 AM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:19:47 AM	72	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:19:47 AM	23	1311.00	TQEX
GENMAB A/S	01-Apr-2025	10:19:47 AM	58	1311.00	CEUX
GENMAB A/S	01-Apr-2025	10:20:19 AM	23	1311.50	TQEX
GENMAB A/S	01-Apr-2025	10:20:19 AM	41	1312.00	CEUX
GENMAB A/S	01-Apr-2025	10:20:19 AM	24	1312.00	CEUX
GENMAB A/S	01-Apr-2025	10:20:19 AM	32	1311.50	AQEU
GENMAB A/S	01-Apr-2025	10:20:21 AM	80	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:20:21 AM	25	1311.00	CEUX
GENMAB A/S	01-Apr-2025	10:20:22 AM	23	1310.50	AQEU
GENMAB A/S	01-Apr-2025	10:20:47 AM	81	1310.00	XCSE
GENMAB A/S	01-Apr-2025	10:20:47 AM	18	1310.00	CEUX
GENMAB A/S	01-Apr-2025	10:20:47 AM	49	1310.00	CEUX

79

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	10:20:49 AM	86	1309.00	XCSE
GENMAB A/S	01-Apr-2025	10:20:49 AM	3	1308.00	XCSE
GENMAB A/S	01-Apr-2025	10:20:49 AM	82	1308.00	XCSE
GENMAB A/S	01-Apr-2025	10:20:49 AM	31	1308.50	AQEU
GENMAB A/S	01-Apr-2025	10:20:56 AM	2	1309.00	CEUX
GENMAB A/S	01-Apr-2025	10:20:56 AM	21	1309.00	CEUX
GENMAB A/S	01-Apr-2025	10:23:11 AM	84	1313.00	XCSE
GENMAB A/S	01-Apr-2025	10:23:12 AM	44	1313.00	TQEX
GENMAB A/S	01-Apr-2025	10:24:06 AM	47	1313.50	CEUX
GENMAB A/S	01-Apr-2025	10:24:07 AM	60	1313.00	XCSE
GENMAB A/S	01-Apr-2025	10:25:02 AM	82	1312.00	XCSE
GENMAB A/S	01-Apr-2025	10:25:02 AM	35	1312.00	CEUX
GENMAB A/S	01-Apr-2025	10:27:04 AM	79	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:27:04 AM	34	1311.00	CEUX
GENMAB A/S	01-Apr-2025	10:27:42 AM	83	1310.50	XCSE
GENMAB A/S	01-Apr-2025	10:29:19 AM	3	1310.50	XCSE
GENMAB A/S	01-Apr-2025	10:30:08 AM	20	1311.00	AQEU
GENMAB A/S	01-Apr-2025	10:31:04 AM	3	1311.00	AQEU
GENMAB A/S	01-Apr-2025	10:31:57 AM	7	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:31:57 AM	29	1310.50	XCSE
GENMAB A/S	01-Apr-2025	10:31:57 AM	11	1310.50	TQEX
GENMAB A/S	01-Apr-2025	10:32:19 AM	54	1310.50	XCSE
GENMAB A/S	01-Apr-2025	10:32:19 AM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	10:32:19 AM	11	1310.50	XCSE
GENMAB A/S	01-Apr-2025	10:32:30 AM	19	1310.50	TQEX
GENMAB A/S	01-Apr-2025	10:32:30 AM	8	1310.50	TQEX
GENMAB A/S	01-Apr-2025	10:32:52 AM	33	1310.00	XCSE
GENMAB A/S	01-Apr-2025	10:32:52 AM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	10:32:52 AM	20	1310.00	XCSE
GENMAB A/S	01-Apr-2025	10:32:52 AM	40	1310.00	XCSE
GENMAB A/S	01-Apr-2025	10:32:52 AM	34	1310.00	CEUX
GENMAB A/S	01-Apr-2025	10:32:52 AM	19	1310.00	AQEU
GENMAB A/S	01-Apr-2025	10:32:52 AM	12	1310.00	AQEU
GENMAB A/S	01-Apr-2025	10:33:10 AM	77	1309.50	XCSE
GENMAB A/S	01-Apr-2025	10:33:48 AM	58	1308.50	XCSE
GENMAB A/S	01-Apr-2025	10:33:48 AM	25	1308.50	CEUX
GENMAB A/S	01-Apr-2025	10:34:23 AM	65	1307.50	CEUX
GENMAB A/S	01-Apr-2025	10:36:04 AM	72	1311.00	CEUX
GENMAB A/S	01-Apr-2025	10:36:11 AM	15	1311.50	XCSE
GENMAB A/S	01-Apr-2025	10:36:11 AM	4	1311.50	XCSE
GENMAB A/S	01-Apr-2025	10:36:11 AM	29	1311.50	XCSE
GENMAB A/S	01-Apr-2025	10:36:11 AM	20	1311.50	XCSE
GENMAB A/S	01-Apr-2025	10:36:11 AM	31	1311.50	XCSE
GENMAB A/S	01-Apr-2025	10:36:11 AM	14	1311.00	CEUX
GENMAB A/S	01-Apr-2025	10:36:24 AM	18	1311.00	CEUX

80

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	10:36:47 AM	85	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:37:17 AM	64	1311.00	CEUX
GENMAB A/S	01-Apr-2025	10:38:18 AM	84	1312.00	XCSE
GENMAB A/S	01-Apr-2025	10:38:59 AM	86	1312.00	XCSE
GENMAB A/S	01-Apr-2025	10:38:59 AM	80	1311.00	XCSE
GENMAB A/S	01-Apr-2025	10:38:59 AM	80	1310.00	XCSE
GENMAB A/S	01-Apr-2025	10:38:59 AM	79	1312.00	CEUX
GENMAB A/S	01-Apr-2025	10:39:00 AM	26	1312.50	AQEU
GENMAB A/S	01-Apr-2025	10:39:01 AM	23	1313.50	TQEX
GENMAB A/S	01-Apr-2025	10:39:47 AM	57	1312.50	XCSE
GENMAB A/S	01-Apr-2025	10:39:47 AM	23	1312.50	TQEX
GENMAB A/S	01-Apr-2025	10:39:47 AM	51	1313.00	CEUX
GENMAB A/S	01-Apr-2025	10:39:47 AM	62	1312.00	CEUX
GENMAB A/S	01-Apr-2025	10:40:35 AM	23	1312.00	CEUX
GENMAB A/S	01-Apr-2025	10:42:09 AM	27	1316.00	AQEU
GENMAB A/S	01-Apr-2025	10:42:14 AM	80	1317.00	XCSE
GENMAB A/S	01-Apr-2025	10:42:14 AM	33	1316.50	CEUX
GENMAB A/S	01-Apr-2025	10:42:14 AM	10	1316.50	CEUX
GENMAB A/S	01-Apr-2025	10:42:14 AM	8	1316.50	CEUX
GENMAB A/S	01-Apr-2025	10:42:14 AM	24	1317.00	AQEU
GENMAB A/S	01-Apr-2025	10:42:20 AM	79	1317.00	XCSE
GENMAB A/S	01-Apr-2025	10:42:20 AM	23	1316.50	CEUX
GENMAB A/S	01-Apr-2025	10:42:20 AM	34	1317.00	CEUX
GENMAB A/S	01-Apr-2025	10:42:35 AM	80	1316.00	XCSE
GENMAB A/S	01-Apr-2025	10:42:35 AM	26	1317.00	TQEX
GENMAB A/S	01-Apr-2025	10:42:35 AM	26	1316.50	AQEU
GENMAB A/S	01-Apr-2025	10:43:03 AM	23	1316.00	XCSE
GENMAB A/S	01-Apr-2025	10:43:27 AM	19	1315.50	CEUX
GENMAB A/S	01-Apr-2025	10:43:43 AM	32	1315.50	CEUX
GENMAB A/S	01-Apr-2025	10:43:43 AM	23	1315.50	AQEU
GENMAB A/S	01-Apr-2025	10:44:39 AM	24	1315.50	CEUX
GENMAB A/S	01-Apr-2025	10:44:44 AM	81	1315.00	XCSE
GENMAB A/S	01-Apr-2025	10:49:06 AM	18	1317.00	CEUX
GENMAB A/S	01-Apr-2025	10:49:06 AM	39	1317.00	CEUX
GENMAB A/S	01-Apr-2025	10:50:26 AM	18	1319.00	TQEX
GENMAB A/S	01-Apr-2025	10:51:06 AM	6	1319.00	TQEX
GENMAB A/S	01-Apr-2025	10:51:55 AM	50	1319.50	XCSE
GENMAB A/S	01-Apr-2025	10:51:55 AM	33	1319.50	XCSE
GENMAB A/S	01-Apr-2025	10:51:55 AM	42	1319.50	TQEX
GENMAB A/S	01-Apr-2025	10:51:55 AM	80	1319.50	CEUX
GENMAB A/S	01-Apr-2025	10:51:55 AM	24	1319.50	AQEU
GENMAB A/S	01-Apr-2025	10:53:02 AM	85	1318.00	XCSE
GENMAB A/S	01-Apr-2025	10:53:02 AM	23	1318.50	XCSE
GENMAB A/S	01-Apr-2025	10:53:02 AM	15	1318.50	XCSE
GENMAB A/S	01-Apr-2025	10:53:02 AM	10	1318.50	XCSE

81

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	10:53:02 AM	68	1318.50	CEUX
GENMAB A/S	01-Apr-2025	10:55:01 AM	81	1318.00	XCSE
GENMAB A/S	01-Apr-2025	10:55:01 AM	30	1318.00	XCSE
GENMAB A/S	01-Apr-2025	10:55:01 AM	26	1318.00	XCSE
GENMAB A/S	01-Apr-2025	10:55:47 AM	18	1317.50	CEUX
GENMAB A/S	01-Apr-2025	10:55:47 AM	48	1317.50	CEUX
GENMAB A/S	01-Apr-2025	10:56:16 AM	50	1319.00	XCSE
GENMAB A/S	01-Apr-2025	10:56:16 AM	13	1319.00	XCSE
GENMAB A/S	01-Apr-2025	10:56:16 AM	27	1319.00	XCSE
GENMAB A/S	01-Apr-2025	10:56:16 AM	12	1319.00	XCSE
GENMAB A/S	01-Apr-2025	10:56:16 AM	6	1319.00	XCSE
GENMAB A/S	01-Apr-2025	10:56:44 AM	80	1319.00	XCSE
GENMAB A/S	01-Apr-2025	10:56:44 AM	62	1319.00	CEUX
GENMAB A/S	01-Apr-2025	10:57:00 AM	9	1319.50	XCSE
GENMAB A/S	01-Apr-2025	10:57:00 AM	9	1319.50	XCSE
GENMAB A/S	01-Apr-2025	10:57:00 AM	12	1319.50	XCSE
GENMAB A/S	01-Apr-2025	10:57:15 AM	86	1319.50	XCSE
GENMAB A/S	01-Apr-2025	10:57:17 AM	23	1318.50	TQEX
GENMAB A/S	01-Apr-2025	10:59:04 AM	79	1318.00	XCSE
GENMAB A/S	01-Apr-2025	10:59:04 AM	18	1318.00	CEUX
GENMAB A/S	01-Apr-2025	10:59:04 AM	39	1318.00	CEUX
GENMAB A/S	01-Apr-2025	11:01:02 AM	32	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:02 AM	12	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:02 AM	10	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:02 AM	12	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:02 AM	2	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:02 AM	10	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:02 AM	9	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:05 AM	10	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:05 AM	9	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:05 AM	11	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:25 AM	7	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:01:40 AM	18	1317.50	AQEU
GENMAB A/S	01-Apr-2025	11:03:01 AM	50	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:03:01 AM	12	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:03:01 AM	12	1318.50	XCSE
GENMAB A/S	01-Apr-2025	11:03:01 AM	80	1318.00	XCSE
GENMAB A/S	01-Apr-2025	11:03:01 AM	24	1318.00	TQEX
GENMAB A/S	01-Apr-2025	11:03:01 AM	10	1318.00	CEUX
GENMAB A/S	01-Apr-2025	11:03:01 AM	13	1318.00	CEUX
GENMAB A/S	01-Apr-2025	11:03:01 AM	62	1318.00	CEUX
GENMAB A/S	01-Apr-2025	11:03:02 AM	13	1318.00	CEUX
GENMAB A/S	01-Apr-2025	11:03:18 AM	23	1319.00	XCSE
GENMAB A/S	01-Apr-2025	11:03:37 AM	48	1320.50	XCSE
GENMAB A/S	01-Apr-2025	11:03:38 AM	35	1320.50	XCSE

82

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	11:03:38 AM	23	1320.50	AQEU
GENMAB A/S	01-Apr-2025	11:03:54 AM	45	1320.00	TQEX
GENMAB A/S	01-Apr-2025	11:03:54 AM	67	1320.00	CEUX
GENMAB A/S	01-Apr-2025	11:04:04 AM	84	1319.50	XCSE
GENMAB A/S	01-Apr-2025	11:04:04 AM	10	1319.50	AQEU
GENMAB A/S	01-Apr-2025	11:04:04 AM	3	1319.50	AQEU
GENMAB A/S	01-Apr-2025	11:04:04 AM	3	1319.50	AQEU
GENMAB A/S	01-Apr-2025	11:05:09 AM	14	1320.00	XCSE
GENMAB A/S	01-Apr-2025	11:05:09 AM	66	1320.00	XCSE
GENMAB A/S	01-Apr-2025	11:07:00 AM	34	1323.00	XCSE
GENMAB A/S	01-Apr-2025	11:07:00 AM	49	1323.00	XCSE
GENMAB A/S	01-Apr-2025	11:07:00 AM	81	1322.50	CEUX
GENMAB A/S	01-Apr-2025	11:07:00 AM	23	1322.50	AQEU
GENMAB A/S	01-Apr-2025	11:08:01 AM	83	1322.00	XCSE
GENMAB A/S	01-Apr-2025	11:08:02 AM	19	1321.50	CEUX
GENMAB A/S	01-Apr-2025	11:08:02 AM	57	1321.50	CEUX
GENMAB A/S	01-Apr-2025	11:08:23 AM	15	1320.50	XCSE
GENMAB A/S	01-Apr-2025	11:08:23 AM	69	1320.50	XCSE
GENMAB A/S	01-Apr-2025	11:08:23 AM	82	1320.50	CEUX
GENMAB A/S	01-Apr-2025	11:08:26 AM	83	1319.00	XCSE
GENMAB A/S	01-Apr-2025	11:08:26 AM	86	1318.00	XCSE
GENMAB A/S	01-Apr-2025	11:08:26 AM	46	1319.00	CEUX
GENMAB A/S	01-Apr-2025	11:08:26 AM	10	1318.00	CEUX
GENMAB A/S	01-Apr-2025	11:08:40 AM	82	1317.00	XCSE
GENMAB A/S	01-Apr-2025	11:10:11 AM	28	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:10:11 AM	10	1314.00	CEUX
GENMAB A/S	01-Apr-2025	11:10:12 AM	17	1314.00	CEUX
GENMAB A/S	01-Apr-2025	11:11:20 AM	24	1313.50	XCSE
GENMAB A/S	01-Apr-2025	11:11:20 AM	25	1313.00	CEUX
GENMAB A/S	01-Apr-2025	11:11:21 AM	26	1312.50	XCSE
GENMAB A/S	01-Apr-2025	11:11:37 AM	19	1312.00	CEUX
GENMAB A/S	01-Apr-2025	11:11:37 AM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	11:11:42 AM	1	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:11:42 AM	39	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:11:42 AM	36	1311.50	AQEU
GENMAB A/S	01-Apr-2025	11:13:37 AM	27	1312.00	TQEX
GENMAB A/S	01-Apr-2025	11:13:38 AM	12	1311.50	CEUX
GENMAB A/S	01-Apr-2025	11:13:42 AM	86	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:13:42 AM	23	1311.50	CEUX
GENMAB A/S	01-Apr-2025	11:13:42 AM	9	1311.50	CEUX
GENMAB A/S	01-Apr-2025	11:16:57 AM	10	1313.00	XCSE
GENMAB A/S	01-Apr-2025	11:16:59 AM	70	1313.00	XCSE
GENMAB A/S	01-Apr-2025	11:16:59 AM	53	1313.00	CEUX
GENMAB A/S	01-Apr-2025	11:17:32 AM	6	1312.50	TQEX
GENMAB A/S	01-Apr-2025	11:17:32 AM	19	1312.50	TQEX

83

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	11:17:32 AM	48	1312.50	CEUX
GENMAB A/S	01-Apr-2025	11:18:57 AM	30	1315.00	XCSE
GENMAB A/S	01-Apr-2025	11:18:57 AM	30	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:18:57 AM	19	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:18:57 AM	15	1316.00	AQEU
GENMAB A/S	01-Apr-2025	11:18:57 AM	7	1316.00	AQEU
GENMAB A/S	01-Apr-2025	11:18:57 AM	34	1316.00	CEUX
GENMAB A/S	01-Apr-2025	11:18:57 AM	20	1316.00	CEUX
GENMAB A/S	01-Apr-2025	11:18:58 AM	1	1316.00	AQEU
GENMAB A/S	01-Apr-2025	11:19:01 AM	54	1315.00	CEUX
GENMAB A/S	01-Apr-2025	11:19:04 AM	79	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:19:04 AM	35	1314.50	AQEU
GENMAB A/S	01-Apr-2025	11:19:06 AM	26	1314.00	CEUX
GENMAB A/S	01-Apr-2025	11:19:06 AM	14	1314.00	CEUX
GENMAB A/S	01-Apr-2025	11:19:55 AM	80	1313.50	XCSE
GENMAB A/S	01-Apr-2025	11:21:12 AM	3	1316.00	TQEX
GENMAB A/S	01-Apr-2025	11:21:12 AM	24	1316.00	TQEX
GENMAB A/S	01-Apr-2025	11:21:23 AM	20	1316.00	AQEU
GENMAB A/S	01-Apr-2025	11:22:45 AM	81	1316.00	XCSE
GENMAB A/S	01-Apr-2025	11:22:45 AM	26	1315.50	CEUX
GENMAB A/S	01-Apr-2025	11:23:27 AM	7	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:23:28 AM	23	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:23:28 AM	50	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:23:28 AM	43	1315.50	CEUX
GENMAB A/S	01-Apr-2025	11:23:36 AM	79	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:23:36 AM	25	1314.50	CEUX
GENMAB A/S	01-Apr-2025	11:24:02 AM	78	1313.50	XCSE
GENMAB A/S	01-Apr-2025	11:24:02 AM	24	1313.50	CEUX
GENMAB A/S	01-Apr-2025	11:24:09 AM	29	1312.50	AQEU
GENMAB A/S	01-Apr-2025	11:24:09 AM	21	1312.00	CEUX
GENMAB A/S	01-Apr-2025	11:24:10 AM	80	1312.00	XCSE
GENMAB A/S	01-Apr-2025	11:24:14 AM	36	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:24:23 AM	23	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:24:37 AM	31	1312.50	XCSE
GENMAB A/S	01-Apr-2025	11:24:58 AM	28	1312.00	TQEX
GENMAB A/S	01-Apr-2025	11:25:08 AM	9	1312.50	XCSE
GENMAB A/S	01-Apr-2025	11:25:17 AM	18	1313.00	CEUX
GENMAB A/S	01-Apr-2025	11:25:28 AM	20	1312.50	XCSE
GENMAB A/S	01-Apr-2025	11:25:28 AM	29	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:25:28 AM	23	1310.50	XCSE
GENMAB A/S	01-Apr-2025	11:25:28 AM	29	1311.50	AQEU
GENMAB A/S	01-Apr-2025	11:25:28 AM	29	1312.00	CEUX
GENMAB A/S	01-Apr-2025	11:25:31 AM	32	1309.50	XCSE
GENMAB A/S	01-Apr-2025	11:27:05 AM	18	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:27:32 AM	24	1311.50	XCSE

84

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	11:27:32 AM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:27:32 AM	14	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:28:54 AM	7	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:28:54 AM	42	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:29:10 AM	20	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:30:16 AM	7	1311.00	AQEU
GENMAB A/S	01-Apr-2025	11:30:16 AM	23	1311.00	TQEX
GENMAB A/S	01-Apr-2025	11:30:27 AM	22	1311.00	AQEU
GENMAB A/S	01-Apr-2025	11:30:27 AM	3	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:32:08 AM	77	1312.00	XCSE
GENMAB A/S	01-Apr-2025	11:32:08 AM	45	1312.00	CEUX
GENMAB A/S	01-Apr-2025	11:32:54 AM	18	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:33:08 AM	24	1311.50	AQEU
GENMAB A/S	01-Apr-2025	11:33:08 AM	23	1311.50	TQEX
GENMAB A/S	01-Apr-2025	11:33:08 AM	7	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:33:54 AM	1	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:34:54 AM	15	1311.00	CEUX
GENMAB A/S	01-Apr-2025	11:35:10 AM	24	1310.50	XCSE
GENMAB A/S	01-Apr-2025	11:35:17 AM	29	1310.00	CEUX
GENMAB A/S	01-Apr-2025	11:36:03 AM	7	1310.00	CEUX
GENMAB A/S	01-Apr-2025	11:38:33 AM	10	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:38:33 AM	38	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:38:33 AM	10	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:38:33 AM	11	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:38:45 AM	18	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:39:23 AM	14	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:39:23 AM	34	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:39:23 AM	33	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:39:37 AM	22	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:39:37 AM	22	1316.00	XCSE
GENMAB A/S	01-Apr-2025	11:39:37 AM	19	1316.00	XCSE
GENMAB A/S	01-Apr-2025	11:40:19 AM	23	1316.00	AQEU
GENMAB A/S	01-Apr-2025	11:40:19 AM	30	1316.00	CEUX
GENMAB A/S	01-Apr-2025	11:40:19 AM	36	1316.00	CEUX
GENMAB A/S	01-Apr-2025	11:40:19 AM	19	1316.00	CEUX
GENMAB A/S	01-Apr-2025	11:40:45 AM	86	1315.50	XCSE
GENMAB A/S	01-Apr-2025	11:40:45 AM	66	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:40:45 AM	18	1315.50	TQEX
GENMAB A/S	01-Apr-2025	11:40:45 AM	12	1315.50	TQEX
GENMAB A/S	01-Apr-2025	11:40:45 AM	86	1315.00	CEUX
GENMAB A/S	01-Apr-2025	11:41:31 AM	45	1314.00	AQEU
GENMAB A/S	01-Apr-2025	11:41:31 AM	78	1314.00	CEUX
GENMAB A/S	01-Apr-2025	11:43:59 AM	80	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:43:59 AM	15	1314.50	XCSE
GENMAB A/S	01-Apr-2025	11:44:54 AM	18	1314.00	CEUX

85

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	11:44:54 AM	5	1314.00	CEUX
GENMAB A/S	01-Apr-2025	11:44:57 AM	80	1313.50	XCSE
GENMAB A/S	01-Apr-2025	11:44:57 AM	13	1314.00	XCSE
GENMAB A/S	01-Apr-2025	11:44:57 AM	38	1314.00	XCSE
GENMAB A/S	01-Apr-2025	11:45:58 AM	81	1313.00	XCSE
GENMAB A/S	01-Apr-2025	11:45:58 AM	30	1313.00	TQEX
GENMAB A/S	01-Apr-2025	11:45:58 AM	57	1313.00	CEUX
GENMAB A/S	01-Apr-2025	11:47:57 AM	48	1313.00	CEUX
GENMAB A/S	01-Apr-2025	11:48:35 AM	23	1313.00	XCSE
GENMAB A/S	01-Apr-2025	11:48:35 AM	16	1313.00	XCSE
GENMAB A/S	01-Apr-2025	11:48:35 AM	11	1313.50	XCSE
GENMAB A/S	01-Apr-2025	11:48:35 AM	16	1313.50	XCSE
GENMAB A/S	01-Apr-2025	11:48:35 AM	6	1313.50	XCSE
GENMAB A/S	01-Apr-2025	11:49:45 AM	86	1313.00	XCSE
GENMAB A/S	01-Apr-2025	11:50:03 AM	56	1313.00	CEUX
GENMAB A/S	01-Apr-2025	11:51:14 AM	26	1312.50	TQEX
GENMAB A/S	01-Apr-2025	11:51:21 AM	83	1312.00	XCSE
GENMAB A/S	01-Apr-2025	11:51:21 AM	41	1312.00	CEUX
GENMAB A/S	01-Apr-2025	11:56:03 AM	43	1311.50	CEUX
GENMAB A/S	01-Apr-2025	11:59:39 AM	35	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:59:39 AM	38	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:59:59 AM	31	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:59:59 AM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	11:59:59 AM	7	1311.50	XCSE
GENMAB A/S	01-Apr-2025	12:00:00 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	12:00:50 PM	84	1311.00	XCSE
GENMAB A/S	01-Apr-2025	12:00:50 PM	49	1310.50	CEUX
GENMAB A/S	01-Apr-2025	12:01:00 PM	24	1310.00	TQEX
GENMAB A/S	01-Apr-2025	12:01:07 PM	81	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:07 PM	24	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:07 PM	38	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:07 PM	17	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:07 PM	35	1309.50	CEUX
GENMAB A/S	01-Apr-2025	12:01:23 PM	38	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:23 PM	17	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:23 PM	10	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:23 PM	31	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:23 PM	10	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:23 PM	2	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:01:23 PM	23	1309.00	TQEX
GENMAB A/S	01-Apr-2025	12:01:27 PM	80	1308.50	XCSE
GENMAB A/S	01-Apr-2025	12:02:57 PM	84	1309.00	CEUX
GENMAB A/S	01-Apr-2025	12:03:14 PM	20	1309.00	XCSE
GENMAB A/S	01-Apr-2025	12:03:32 PM	61	1309.00	XCSE
GENMAB A/S	01-Apr-2025	12:03:47 PM	82	1308.00	XCSE

86

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	12:03:47 PM	79	1308.00	CEUX
GENMAB A/S	01-Apr-2025	12:04:35 PM	85	1307.00	XCSE
GENMAB A/S	01-Apr-2025	12:09:25 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:09:25 PM	38	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:09:25 PM	20	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:09:25 PM	31	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:09:35 PM	4	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:09:58 PM	86	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:10:08 PM	31	1307.50	TQEX
GENMAB A/S	01-Apr-2025	12:10:08 PM	64	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:10:08 PM	22	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:11:03 PM	83	1307.00	XCSE
GENMAB A/S	01-Apr-2025	12:12:23 PM	12	1308.50	XCSE
GENMAB A/S	01-Apr-2025	12:12:24 PM	4	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:12:24 PM	75	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:14:25 PM	9	1308.50	XCSE
GENMAB A/S	01-Apr-2025	12:14:25 PM	11	1308.50	XCSE
GENMAB A/S	01-Apr-2025	12:14:44 PM	32	1307.00	XCSE
GENMAB A/S	01-Apr-2025	12:14:44 PM	27	1308.00	TQEX
GENMAB A/S	01-Apr-2025	12:14:44 PM	25	1308.00	AQEU
GENMAB A/S	01-Apr-2025	12:14:44 PM	84	1308.00	CEUX
GENMAB A/S	01-Apr-2025	12:14:50 PM	86	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:16:19 PM	84	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:16:19 PM	2	1308.00	AQEU
GENMAB A/S	01-Apr-2025	12:16:19 PM	1	1308.00	AQEU
GENMAB A/S	01-Apr-2025	12:20:48 PM	25	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:20:48 PM	12	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:20:48 PM	17	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:20:48 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:20:48 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:20:48 PM	31	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:20:48 PM	27	1308.00	AQEU
GENMAB A/S	01-Apr-2025	12:20:48 PM	7	1308.00	AQEU
GENMAB A/S	01-Apr-2025	12:20:48 PM	1	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:21:58 PM	108	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:21:58 PM	26	1307.50	TQEX
GENMAB A/S	01-Apr-2025	12:21:58 PM	65	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:23:41 PM	51	1307.00	XCSE
GENMAB A/S	01-Apr-2025	12:24:09 PM	23	1306.50	TQEX
GENMAB A/S	01-Apr-2025	12:24:09 PM	30	1306.50	CEUX
GENMAB A/S	01-Apr-2025	12:24:09 PM	55	1306.50	CEUX
GENMAB A/S	01-Apr-2025	12:24:32 PM	80	1306.00	XCSE
GENMAB A/S	01-Apr-2025	12:24:32 PM	34	1306.50	XCSE
GENMAB A/S	01-Apr-2025	12:24:32 PM	29	1306.50	XCSE
GENMAB A/S	01-Apr-2025	12:24:32 PM	18	1306.50	XCSE

87

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	12:24:32 PM	27	1306.50	XCSE
GENMAB A/S	01-Apr-2025	12:25:14 PM	3	1305.50	CEUX
GENMAB A/S	01-Apr-2025	12:25:14 PM	72	1305.50	CEUX
GENMAB A/S	01-Apr-2025	12:26:06 PM	4	1305.50	XCSE
GENMAB A/S	01-Apr-2025	12:26:06 PM	10	1305.50	XCSE
GENMAB A/S	01-Apr-2025	12:30:07 PM	24	1306.00	TQEX
GENMAB A/S	01-Apr-2025	12:30:07 PM	41	1306.00	AQEU
GENMAB A/S	01-Apr-2025	12:30:07 PM	38	1306.00	CEUX
GENMAB A/S	01-Apr-2025	12:30:07 PM	47	1306.00	CEUX
GENMAB A/S	01-Apr-2025	12:30:08 PM	82	1305.50	XCSE
GENMAB A/S	01-Apr-2025	12:30:08 PM	33	1306.00	XCSE
GENMAB A/S	01-Apr-2025	12:30:08 PM	14	1306.00	XCSE
GENMAB A/S	01-Apr-2025	12:30:08 PM	59	1306.00	XCSE
GENMAB A/S	01-Apr-2025	12:30:08 PM	2	1306.00	XCSE
GENMAB A/S	01-Apr-2025	12:30:08 PM	9	1305.50	XCSE
GENMAB A/S	01-Apr-2025	12:30:14 PM	70	1305.50	XCSE
GENMAB A/S	01-Apr-2025	12:30:29 PM	23	1305.00	TQEX
GENMAB A/S	01-Apr-2025	12:30:29 PM	83	1305.00	CEUX
GENMAB A/S	01-Apr-2025	12:31:33 PM	59	1305.00	CEUX
GENMAB A/S	01-Apr-2025	12:31:35 PM	79	1304.50	XCSE
GENMAB A/S	01-Apr-2025	12:33:08 PM	75	1304.00	CEUX
GENMAB A/S	01-Apr-2025	12:42:48 PM	108	1310.00	XCSE
GENMAB A/S	01-Apr-2025	12:42:49 PM	18	1310.00	XCSE
GENMAB A/S	01-Apr-2025	12:44:00 PM	20	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:44:00 PM	8	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:44:00 PM	12	1309.50	CEUX
GENMAB A/S	01-Apr-2025	12:44:00 PM	69	1309.50	CEUX
GENMAB A/S	01-Apr-2025	12:44:33 PM	82	1309.00	XCSE
GENMAB A/S	01-Apr-2025	12:44:33 PM	35	1309.00	AQEU
GENMAB A/S	01-Apr-2025	12:45:52 PM	24	1308.50	TQEX
GENMAB A/S	01-Apr-2025	12:45:52 PM	79	1308.50	CEUX
GENMAB A/S	01-Apr-2025	12:47:16 PM	22	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:49:17 PM	28	1310.00	TQEX
GENMAB A/S	01-Apr-2025	12:50:11 PM	1	1309.50	AQEU
GENMAB A/S	01-Apr-2025	12:50:56 PM	9	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:50:56 PM	53	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:50:56 PM	26	1309.50	AQEU
GENMAB A/S	01-Apr-2025	12:50:58 PM	11	1309.00	CEUX
GENMAB A/S	01-Apr-2025	12:51:31 PM	39	1309.00	CEUX
GENMAB A/S	01-Apr-2025	12:52:09 PM	30	1309.50	XCSE
GENMAB A/S	01-Apr-2025	12:52:09 PM	16	1309.00	CEUX
GENMAB A/S	01-Apr-2025	12:52:58 PM	15	1309.00	CEUX
GENMAB A/S	01-Apr-2025	12:53:00 PM	79	1308.50	XCSE
GENMAB A/S	01-Apr-2025	12:53:00 PM	38	1308.50	XCSE
GENMAB A/S	01-Apr-2025	12:53:00 PM	14	1308.50	XCSE

88

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	12:53:00 PM	23	1308.50	TQEX
GENMAB A/S	01-Apr-2025	12:56:55 PM	2	1308.00	XCSE
GENMAB A/S	01-Apr-2025	12:56:55 PM	24	1308.00	CEUX
GENMAB A/S	01-Apr-2025	12:59:15 PM	79	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:59:15 PM	7	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:59:15 PM	38	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:59:15 PM	27	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:59:15 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:59:15 PM	29	1307.50	TQEX
GENMAB A/S	01-Apr-2025	12:59:15 PM	79	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:59:15 PM	36	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:59:15 PM	1	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:59:15 PM	33	1307.50	CEUX
GENMAB A/S	01-Apr-2025	12:59:16 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:59:16 PM	2	1307.50	XCSE
GENMAB A/S	01-Apr-2025	12:59:18 PM	3	1307.50	XCSE
GENMAB A/S	01-Apr-2025	13:01:28 PM	4	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:01:28 PM	4	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:01:28 PM	36	1307.50	CEUX
GENMAB A/S	01-Apr-2025	13:01:28 PM	16	1307.50	CEUX
GENMAB A/S	01-Apr-2025	13:02:06 PM	27	1307.50	CEUX
GENMAB A/S	01-Apr-2025	13:02:43 PM	27	1307.50	AQEU
GENMAB A/S	01-Apr-2025	13:02:59 PM	38	1308.00	XCSE
GENMAB A/S	01-Apr-2025	13:02:59 PM	7	1308.00	XCSE
GENMAB A/S	01-Apr-2025	13:02:59 PM	31	1308.00	XCSE
GENMAB A/S	01-Apr-2025	13:02:59 PM	26	1308.00	XCSE
GENMAB A/S	01-Apr-2025	13:02:59 PM	23	1307.50	TQEX
GENMAB A/S	01-Apr-2025	13:02:59 PM	5	1307.50	AQEU
GENMAB A/S	01-Apr-2025	13:02:59 PM	53	1307.50	CEUX
GENMAB A/S	01-Apr-2025	13:04:36 PM	23	1307.50	TQEX
GENMAB A/S	01-Apr-2025	13:04:36 PM	79	1307.50	CEUX
GENMAB A/S	01-Apr-2025	13:04:50 PM	68	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:04:50 PM	9	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:05:10 PM	25	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:05:10 PM	38	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:05:10 PM	84	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:05:10 PM	25	1306.50	TQEX
GENMAB A/S	01-Apr-2025	13:05:10 PM	34	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:05:10 PM	46	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:05:11 PM	38	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:05:11 PM	42	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:05:50 PM	86	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:06:05 PM	38	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:06:05 PM	13	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:06:05 PM	11	1306.00	XCSE

89

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	13:06:05 PM	31	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:06:05 PM	80	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:12:41 PM	10	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:12:48 PM	2	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:13:46 PM	12	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:46 PM	38	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:46 PM	31	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:47 PM	9	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:47 PM	38	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:47 PM	11	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:47 PM	9	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:47 PM	31	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:50 PM	38	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:50 PM	11	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:50 PM	10	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:13:50 PM	1	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:14:00 PM	12	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:14:00 PM	38	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:14:00 PM	31	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:14:00 PM	27	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:14:07 PM	37	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:14:07 PM	38	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:14:07 PM	28	1306.50	TQEX
GENMAB A/S	01-Apr-2025	13:14:07 PM	29	1306.50	AQEU
GENMAB A/S	01-Apr-2025	13:14:48 PM	85	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:14:48 PM	41	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:14:48 PM	72	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:14:50 PM	11	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:14:50 PM	41	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:11 PM	38	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:11 PM	32	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:11 PM	79	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:16:11 PM	4	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:16:12 PM	32	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:12 PM	97	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:12 PM	10	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:12 PM	1	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:12 PM	85	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:16:12 PM	4	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:16:12 PM	1	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:16:12 PM	86	1305.00	CEUX
GENMAB A/S	01-Apr-2025	13:16:12 PM	84	1304.00	CEUX
GENMAB A/S	01-Apr-2025	13:17:16 PM	3	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:20:14 PM	86	1305.50	CEUX
GENMAB A/S	01-Apr-2025	13:20:38 PM	83	1305.00	XCSE

90

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	13:20:38 PM	25	1305.00	TQEX
GENMAB A/S	01-Apr-2025	13:21:17 PM	80	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:17 PM	24	1305.00	CEUX
GENMAB A/S	01-Apr-2025	13:21:18 PM	38	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:18 PM	12	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:18 PM	12	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:18 PM	11	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:18 PM	30	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:18 PM	5	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:19 PM	10	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:19 PM	38	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:19 PM	11	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:21:19 PM	12	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:22:05 PM	11	1305.00	XCSE
GENMAB A/S	01-Apr-2025	13:24:27 PM	16	1305.00	TQEX
GENMAB A/S	01-Apr-2025	13:24:27 PM	52	1305.00	CEUX
GENMAB A/S	01-Apr-2025	13:25:27 PM	20	1304.50	XCSE
GENMAB A/S	01-Apr-2025	13:25:27 PM	64	1304.50	XCSE
GENMAB A/S	01-Apr-2025	13:26:03 PM	4	1304.00	CEUX
GENMAB A/S	01-Apr-2025	13:29:09 PM	18	1304.00	CEUX
GENMAB A/S	01-Apr-2025	13:30:12 PM	18	1304.00	CEUX
GENMAB A/S	01-Apr-2025	13:30:12 PM	42	1304.00	CEUX
GENMAB A/S	01-Apr-2025	13:31:14 PM	1	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:14 PM	77	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:14 PM	34	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:14 PM	38	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:14 PM	8	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:14 PM	26	1303.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:14 PM	81	1302.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:14 PM	30	1303.50	TQEX
GENMAB A/S	01-Apr-2025	13:31:14 PM	86	1302.50	CEUX
GENMAB A/S	01-Apr-2025	13:31:15 PM	26	1302.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:15 PM	38	1302.50	XCSE
GENMAB A/S	01-Apr-2025	13:31:15 PM	26	1302.00	XCSE
GENMAB A/S	01-Apr-2025	13:31:15 PM	34	1302.00	XCSE
GENMAB A/S	01-Apr-2025	13:31:28 PM	85	1302.00	XCSE
GENMAB A/S	01-Apr-2025	13:32:01 PM	80	1303.00	XCSE
GENMAB A/S	01-Apr-2025	13:38:38 PM	10	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:38:38 PM	15	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:39:09 PM	12	1307.50	CEUX
GENMAB A/S	01-Apr-2025	13:39:11 PM	83	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:39:11 PM	25	1307.00	TQEX
GENMAB A/S	01-Apr-2025	13:39:11 PM	67	1307.50	CEUX
GENMAB A/S	01-Apr-2025	13:39:39 PM	82	1306.00	XCSE
GENMAB A/S	01-Apr-2025	13:39:39 PM	38	1306.50	XCSE

91

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	13:39:39 PM	7	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:39:39 PM	27	1306.50	XCSE
GENMAB A/S	01-Apr-2025	13:39:39 PM	36	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:39:39 PM	28	1306.50	AQEU
GENMAB A/S	01-Apr-2025	13:39:39 PM	71	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:39:39 PM	8	1306.00	CEUX
GENMAB A/S	01-Apr-2025	13:40:14 PM	26	1306.50	TQEX
GENMAB A/S	01-Apr-2025	13:42:17 PM	10	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:42:17 PM	75	1307.00	XCSE
GENMAB A/S	01-Apr-2025	13:42:17 PM	84	1307.00	CEUX
GENMAB A/S	01-Apr-2025	13:44:34 PM	27	1309.00	XCSE
GENMAB A/S	01-Apr-2025	13:44:34 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	13:44:34 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	13:44:34 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	13:44:34 PM	9	1309.00	XCSE
GENMAB A/S	01-Apr-2025	13:45:33 PM	32	1309.00	CEUX
GENMAB A/S	01-Apr-2025	13:50:02 PM	28	1311.00	XCSE
GENMAB A/S	01-Apr-2025	13:50:56 PM	13	1310.50	AQEU
GENMAB A/S	01-Apr-2025	13:50:56 PM	7	1310.50	AQEU
GENMAB A/S	01-Apr-2025	13:50:56 PM	16	1310.50	AQEU
GENMAB A/S	01-Apr-2025	13:51:55 PM	43	1311.00	XCSE
GENMAB A/S	01-Apr-2025	13:51:55 PM	30	1311.00	XCSE
GENMAB A/S	01-Apr-2025	13:51:58 PM	13	1311.00	CEUX
GENMAB A/S	01-Apr-2025	13:54:13 PM	36	1311.00	CEUX
GENMAB A/S	01-Apr-2025	13:54:20 PM	82	1310.00	XCSE
GENMAB A/S	01-Apr-2025	13:54:20 PM	32	1310.50	CEUX
GENMAB A/S	01-Apr-2025	13:55:50 PM	81	1310.50	XCSE
GENMAB A/S	01-Apr-2025	13:55:58 PM	18	1310.50	CEUX
GENMAB A/S	01-Apr-2025	13:56:49 PM	38	1311.00	XCSE
GENMAB A/S	01-Apr-2025	13:56:49 PM	20	1311.00	XCSE
GENMAB A/S	01-Apr-2025	13:56:49 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	13:56:49 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	13:56:49 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	14:01:14 PM	51	1316.50	TQEX
GENMAB A/S	01-Apr-2025	14:01:14 PM	66	1317.50	AQEU
GENMAB A/S	01-Apr-2025	14:01:14 PM	57	1314.00	CEUX
GENMAB A/S	01-Apr-2025	14:01:14 PM	31	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:01:14 PM	51	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:01:15 PM	13	1317.00	XCSE
GENMAB A/S	01-Apr-2025	14:01:15 PM	70	1317.00	XCSE
GENMAB A/S	01-Apr-2025	14:01:15 PM	24	1317.00	XCSE
GENMAB A/S	01-Apr-2025	14:01:15 PM	64	1316.50	AQEU
GENMAB A/S	01-Apr-2025	14:01:15 PM	36	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:01:15 PM	63	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:01:16 PM	86	1316.00	XCSE

92

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	14:01:16 PM	37	1316.00	TQEX
GENMAB A/S	01-Apr-2025	14:01:16 PM	10	1315.50	AQEU
GENMAB A/S	01-Apr-2025	14:01:16 PM	79	1315.50	CEUX
GENMAB A/S	01-Apr-2025	14:02:08 PM	84	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:08 PM	84	1315.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:08 PM	50	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:08 PM	18	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:08 PM	40	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:08 PM	25	1316.00	TQEX
GENMAB A/S	01-Apr-2025	14:02:08 PM	23	1315.00	TQEX
GENMAB A/S	01-Apr-2025	14:02:08 PM	39	1315.50	AQEU
GENMAB A/S	01-Apr-2025	14:02:08 PM	85	1316.00	CEUX
GENMAB A/S	01-Apr-2025	14:02:08 PM	84	1315.00	CEUX
GENMAB A/S	01-Apr-2025	14:02:09 PM	79	1315.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	37	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	11	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	24	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	10	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	9	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	10	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	38	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:16 PM	15	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	81	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	23	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	12	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	9	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	12	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	24	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	11	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	17	1316.00	XCSE
GENMAB A/S	01-Apr-2025	14:02:29 PM	10	1315.50	AQEU
GENMAB A/S	01-Apr-2025	14:02:29 PM	15	1315.50	AQEU
GENMAB A/S	01-Apr-2025	14:03:12 PM	1	1315.00	XCSE
GENMAB A/S	01-Apr-2025	14:03:12 PM	44	1315.00	XCSE
GENMAB A/S	01-Apr-2025	14:03:12 PM	34	1315.00	XCSE
GENMAB A/S	01-Apr-2025	14:03:12 PM	22	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:03:12 PM	12	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:03:12 PM	61	1315.00	CEUX
GENMAB A/S	01-Apr-2025	14:03:12 PM	19	1315.00	CEUX
GENMAB A/S	01-Apr-2025	14:04:32 PM	42	1315.00	TQEX
GENMAB A/S	01-Apr-2025	14:05:08 PM	38	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:05:08 PM	22	1315.50	XCSE
GENMAB A/S	01-Apr-2025	14:05:08 PM	34	1315.00	AQEU
GENMAB A/S	01-Apr-2025	14:07:36 PM	38	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:36 PM	30	1321.50	XCSE

93

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	14:07:36 PM	40	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:36 PM	12	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:36 PM	10	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:36 PM	10	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:36 PM	30	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:36 PM	46	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:53 PM	83	1320.50	XCSE
GENMAB A/S	01-Apr-2025	14:07:53 PM	17	1320.50	AQEU
GENMAB A/S	01-Apr-2025	14:07:53 PM	83	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:07:55 PM	13	1320.50	AQEU
GENMAB A/S	01-Apr-2025	14:09:00 PM	82	1319.50	XCSE
GENMAB A/S	01-Apr-2025	14:09:00 PM	26	1319.50	AQEU
GENMAB A/S	01-Apr-2025	14:09:00 PM	82	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:09:10 PM	85	1318.50	XCSE
GENMAB A/S	01-Apr-2025	14:09:10 PM	33	1318.50	AQEU
GENMAB A/S	01-Apr-2025	14:09:10 PM	86	1318.50	CEUX
GENMAB A/S	01-Apr-2025	14:09:32 PM	2	1317.50	TQEX
GENMAB A/S	01-Apr-2025	14:09:32 PM	21	1317.50	TQEX
GENMAB A/S	01-Apr-2025	14:10:55 PM	81	1317.00	XCSE
GENMAB A/S	01-Apr-2025	14:10:55 PM	29	1317.00	AQEU
GENMAB A/S	01-Apr-2025	14:10:55 PM	18	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:10:55 PM	65	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:13:18 PM	83	1317.00	XCSE
GENMAB A/S	01-Apr-2025	14:13:18 PM	64	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:14:45 PM	6	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:15:18 PM	56	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:17:14 PM	25	1319.50	TQEX
GENMAB A/S	01-Apr-2025	14:17:14 PM	26	1319.50	AQEU
GENMAB A/S	01-Apr-2025	14:17:14 PM	80	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:17:15 PM	35	1319.50	XCSE
GENMAB A/S	01-Apr-2025	14:17:15 PM	50	1319.50	XCSE
GENMAB A/S	01-Apr-2025	14:17:15 PM	7	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:17:15 PM	28	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:18:33 PM	17	1321.00	XCSE
GENMAB A/S	01-Apr-2025	14:18:33 PM	38	1321.00	XCSE
GENMAB A/S	01-Apr-2025	14:18:33 PM	82	1320.50	XCSE
GENMAB A/S	01-Apr-2025	14:18:33 PM	35	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:18:46 PM	23	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:20:18 PM	33	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:20:18 PM	48	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:20:18 PM	32	1321.50	TQEX
GENMAB A/S	01-Apr-2025	14:21:05 PM	38	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:05 PM	30	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:05 PM	11	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:05 PM	12	1321.50	XCSE

94

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	14:21:05 PM	12	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:05 PM	38	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:05 PM	9	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:05 PM	36	1321.50	AQEU
GENMAB A/S	01-Apr-2025	14:21:05 PM	25	1321.00	CEUX
GENMAB A/S	01-Apr-2025	14:21:12 PM	38	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	30	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	9	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	31	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	12	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	11	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	38	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	11	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:12 PM	1	1321.00	CEUX
GENMAB A/S	01-Apr-2025	14:21:12 PM	68	1321.00	CEUX
GENMAB A/S	01-Apr-2025	14:21:27 PM	82	1320.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:27 PM	45	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:21:57 PM	6	1319.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:57 PM	75	1319.50	XCSE
GENMAB A/S	01-Apr-2025	14:21:57 PM	54	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:22:27 PM	86	1320.50	XCSE
GENMAB A/S	01-Apr-2025	14:22:27 PM	1	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:22:27 PM	18	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:22:27 PM	9	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:23:30 PM	23	1319.50	TQEX
GENMAB A/S	01-Apr-2025	14:23:30 PM	24	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:23:41 PM	25	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:25:01 PM	83	1319.00	XCSE
GENMAB A/S	01-Apr-2025	14:26:25 PM	23	1319.50	XCSE
GENMAB A/S	01-Apr-2025	14:26:25 PM	14	1319.50	XCSE
GENMAB A/S	01-Apr-2025	14:26:41 PM	86	1318.00	XCSE
GENMAB A/S	01-Apr-2025	14:26:41 PM	32	1318.00	TQEX
GENMAB A/S	01-Apr-2025	14:26:41 PM	31	1318.50	CEUX
GENMAB A/S	01-Apr-2025	14:27:54 PM	68	1317.00	XCSE
GENMAB A/S	01-Apr-2025	14:27:54 PM	30	1317.00	CEUX
GENMAB A/S	01-Apr-2025	14:28:42 PM	59	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:29:40 PM	42	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:29:40 PM	22	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:30:08 PM	44	1320.50	TQEX
GENMAB A/S	01-Apr-2025	14:30:08 PM	19	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:30:08 PM	42	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:30:33 PM	30	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:32:22 PM	56	1320.50	CEUX
GENMAB A/S	01-Apr-2025	14:32:54 PM	52	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:32:54 PM	91	1320.00	XCSE

95

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	14:32:54 PM	15	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:32:54 PM	2	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:32:58 PM	25	1319.50	AQEU
GENMAB A/S	01-Apr-2025	14:32:58 PM	36	1319.50	CEUX
GENMAB A/S	01-Apr-2025	14:33:05 PM	91	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:33:05 PM	10	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:34:06 PM	34	1320.50	XCSE
GENMAB A/S	01-Apr-2025	14:34:25 PM	65	1320.00	XCSE
GENMAB A/S	01-Apr-2025	14:36:57 PM	33	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:36:57 PM	45	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:36:57 PM	19	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:36:57 PM	11	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:36:57 PM	32	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:36:57 PM	50	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:37:17 PM	86	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:37:17 PM	45	1322.00	TQEX
GENMAB A/S	01-Apr-2025	14:38:19 PM	18	1321.50	CEUX
GENMAB A/S	01-Apr-2025	14:38:23 PM	10	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:38:23 PM	38	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:38:23 PM	10	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:38:23 PM	31	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:38:23 PM	19	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:40:44 PM	79	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:40:44 PM	38	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:40:44 PM	2	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:40:44 PM	70	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:41:24 PM	38	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:41:24 PM	50	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:41:24 PM	30	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:41:29 PM	4	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:41:45 PM	3	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:41:46 PM	12	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:41:46 PM	11	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:41:55 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:41:55 PM	38	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:41:55 PM	7	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:43:15 PM	18	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:43:15 PM	65	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:45:36 PM	10	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:45:36 PM	10	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:45:36 PM	38	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:45:36 PM	11	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:46:53 PM	11	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:47:50 PM	31	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:47:50 PM	50	1323.50	XCSE

96

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	14:47:50 PM	12	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:47:50 PM	14	1323.50	TQEX
GENMAB A/S	01-Apr-2025	14:47:50 PM	15	1323.50	TQEX
GENMAB A/S	01-Apr-2025	14:47:50 PM	43	1323.50	AQEU
GENMAB A/S	01-Apr-2025	14:48:15 PM	69	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:48:15 PM	38	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:48:15 PM	19	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:48:15 PM	31	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:48:15 PM	26	1322.50	TQEX
GENMAB A/S	01-Apr-2025	14:48:15 PM	32	1323.00	CEUX
GENMAB A/S	01-Apr-2025	14:48:15 PM	79	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:48:17 PM	27	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:48:17 PM	47	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:48:17 PM	34	1322.50	AQEU
GENMAB A/S	01-Apr-2025	14:48:17 PM	81	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:49:09 PM	79	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:50:27 PM	3	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:52:17 PM	5	1323.50	CEUX
GENMAB A/S	01-Apr-2025	14:52:17 PM	79	1323.50	CEUX
GENMAB A/S	01-Apr-2025	14:52:28 PM	12	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:52:28 PM	12	1323.50	XCSE
GENMAB A/S	01-Apr-2025	14:52:51 PM	66	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:52:51 PM	16	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:52:51 PM	38	1323.00	XCSE
GENMAB A/S	01-Apr-2025	14:52:51 PM	29	1322.50	TQEX
GENMAB A/S	01-Apr-2025	14:52:51 PM	84	1322.50	CEUX
GENMAB A/S	01-Apr-2025	14:53:26 PM	5	1322.50	XCSE
GENMAB A/S	01-Apr-2025	14:54:34 PM	83	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:54:34 PM	10	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:54:34 PM	11	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:54:34 PM	12	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:54:34 PM	23	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:54:34 PM	12	1322.00	XCSE
GENMAB A/S	01-Apr-2025	14:55:15 PM	39	1321.50	CEUX
GENMAB A/S	01-Apr-2025	14:55:16 PM	26	1321.50	CEUX
GENMAB A/S	01-Apr-2025	14:55:17 PM	40	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:55:17 PM	10	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:55:17 PM	7	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:55:17 PM	14	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:55:17 PM	12	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:55:17 PM	11	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:55:22 PM	1	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:56:21 PM	8	1321.50	CEUX
GENMAB A/S	01-Apr-2025	14:56:21 PM	43	1321.50	CEUX
GENMAB A/S	01-Apr-2025	14:57:06 PM	31	1321.50	CEUX

97

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	14:57:25 PM	35	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:57:25 PM	1	1321.50	XCSE
GENMAB A/S	01-Apr-2025	14:58:21 PM	84	1321.00	XCSE
GENMAB A/S	01-Apr-2025	14:58:21 PM	1	1321.00	TQEX
GENMAB A/S	01-Apr-2025	14:58:21 PM	24	1321.00	TQEX
GENMAB A/S	01-Apr-2025	14:58:34 PM	80	1321.00	XCSE
GENMAB A/S	01-Apr-2025	14:58:34 PM	38	1321.00	XCSE
GENMAB A/S	01-Apr-2025	14:58:34 PM	35	1321.00	AQEU
GENMAB A/S	01-Apr-2025	15:00:26 PM	32	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:01:14 PM	8	1322.00	XCSE
GENMAB A/S	01-Apr-2025	15:02:19 PM	6	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:01 PM	75	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:03 PM	27	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:03 PM	9	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:03 PM	12	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:03 PM	53	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:03 PM	33	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:03 PM	35	1321.00	TQEX
GENMAB A/S	01-Apr-2025	15:03:03 PM	5	1321.50	CEUX
GENMAB A/S	01-Apr-2025	15:03:03 PM	6	1321.50	CEUX
GENMAB A/S	01-Apr-2025	15:03:03 PM	5	1321.50	CEUX
GENMAB A/S	01-Apr-2025	15:03:03 PM	69	1321.00	CEUX
GENMAB A/S	01-Apr-2025	15:03:03 PM	4	1321.00	CEUX
GENMAB A/S	01-Apr-2025	15:03:03 PM	11	1321.00	CEUX
GENMAB A/S	01-Apr-2025	15:03:04 PM	38	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	9	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	11	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	50	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	20	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	11	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	29	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	12	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	36	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	9	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	12	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	38	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:04 PM	4	1320.50	XCSE
GENMAB A/S	01-Apr-2025	15:03:11 PM	1	1320.00	TQEX
GENMAB A/S	01-Apr-2025	15:03:11 PM	22	1320.00	TQEX
GENMAB A/S	01-Apr-2025	15:03:11 PM	85	1320.00	CEUX
GENMAB A/S	01-Apr-2025	15:03:15 PM	79	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:05:34 PM	24	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:05:34 PM	8	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:06:50 PM	86	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:06:50 PM	24	1321.50	TQEX

98

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:06:50 PM	2	1321.50	TQEX
GENMAB A/S	01-Apr-2025	15:06:50 PM	23	1321.50	AQEU
GENMAB A/S	01-Apr-2025	15:06:50 PM	81	1321.50	CEUX
GENMAB A/S	01-Apr-2025	15:06:51 PM	42	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:06:51 PM	38	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:06:51 PM	26	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:06:51 PM	2	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:06:51 PM	8	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:07:17 PM	28	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:07:17 PM	26	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:07:17 PM	10	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:07:17 PM	9	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:07:17 PM	11	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:08:33 PM	10	1322.00	XCSE
GENMAB A/S	01-Apr-2025	15:08:57 PM	81	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:08:58 PM	15	1323.50	CEUX
GENMAB A/S	01-Apr-2025	15:08:58 PM	28	1323.50	CEUX
GENMAB A/S	01-Apr-2025	15:09:04 PM	3	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:09:04 PM	22	1323.50	CEUX
GENMAB A/S	01-Apr-2025	15:09:10 PM	10	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:09:16 PM	9	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:10:26 PM	20	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:10:26 PM	10	1323.50	CEUX
GENMAB A/S	01-Apr-2025	15:11:09 PM	25	1324.00	TQEX
GENMAB A/S	01-Apr-2025	15:11:26 PM	10	1324.00	XCSE
GENMAB A/S	01-Apr-2025	15:11:38 PM	25	1324.00	XCSE
GENMAB A/S	01-Apr-2025	15:11:38 PM	28	1324.00	CEUX
GENMAB A/S	01-Apr-2025	15:12:47 PM	14	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:12:47 PM	3	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:12:49 PM	25	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:13:02 PM	23	1324.50	TQEX
GENMAB A/S	01-Apr-2025	15:13:02 PM	31	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:13:02 PM	49	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:13:28 PM	36	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:13:40 PM	36	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:14:04 PM	18	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:14:20 PM	38	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:20 PM	10	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:20 PM	45	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:20 PM	12	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:20 PM	3	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:20 PM	71	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:14:21 PM	6	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	10	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	45	1324.50	XCSE

99

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:14:21 PM	9	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	38	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	12	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	38	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	12	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	12	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	34	1324.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	79	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:21 PM	23	1324.00	TQEX
GENMAB A/S	01-Apr-2025	15:14:21 PM	14	1324.50	AQEU
GENMAB A/S	01-Apr-2025	15:14:21 PM	12	1324.50	AQEU
GENMAB A/S	01-Apr-2025	15:14:21 PM	68	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:14:21 PM	17	1324.50	CEUX
GENMAB A/S	01-Apr-2025	15:14:21 PM	82	1323.50	CEUX
GENMAB A/S	01-Apr-2025	15:14:42 PM	82	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:42 PM	50	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:42 PM	19	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:14:42 PM	38	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:14:42 PM	1	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:14:42 PM	23	1323.00	TQEX
GENMAB A/S	01-Apr-2025	15:14:42 PM	29	1323.00	AQEU
GENMAB A/S	01-Apr-2025	15:15:59 PM	9	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:15:59 PM	10	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:16:29 PM	2	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:17:04 PM	8	1323.00	CEUX
GENMAB A/S	01-Apr-2025	15:18:20 PM	9	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:18:20 PM	10	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:18:20 PM	10	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:18:20 PM	20	1323.50	AQEU
GENMAB A/S	01-Apr-2025	15:18:20 PM	10	1323.50	AQEU
GENMAB A/S	01-Apr-2025	15:18:51 PM	44	1323.50	XCSE
GENMAB A/S	01-Apr-2025	15:18:51 PM	32	1323.50	CEUX
GENMAB A/S	01-Apr-2025	15:19:38 PM	15	1323.50	CEUX
GENMAB A/S	01-Apr-2025	15:19:39 PM	86	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	70	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	29	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	9	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	31	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	10	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	9	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	12	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:39 PM	18	1323.00	CEUX
GENMAB A/S	01-Apr-2025	15:19:39 PM	60	1323.00	CEUX
GENMAB A/S	01-Apr-2025	15:19:39 PM	72	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:19:40 PM	9	1322.50	XCSE

100

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:19:40 PM	10	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:40 PM	10	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:40 PM	29	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:40 PM	11	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:40 PM	9	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:40 PM	38	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:40 PM	11	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:40 PM	29	1322.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:58 PM	71	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:58 PM	11	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:19:58 PM	31	1321.50	TQEX
GENMAB A/S	01-Apr-2025	15:19:58 PM	2	1321.50	TQEX
GENMAB A/S	01-Apr-2025	15:21:25 PM	82	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:21:52 PM	86	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:21:52 PM	59	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:21:52 PM	18	1323.00	CEUX
GENMAB A/S	01-Apr-2025	15:21:52 PM	65	1323.00	CEUX
GENMAB A/S	01-Apr-2025	15:22:26 PM	33	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:26 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:26 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:26 PM	12	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:26 PM	9	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:26 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:27 PM	11	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:27 PM	12	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:27 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:28 PM	11	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:28 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:29 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:29 PM	13	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:35 PM	11	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:35 PM	12	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:35 PM	10	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:35 PM	34	1323.00	XCSE
GENMAB A/S	01-Apr-2025	15:22:39 PM	28	1322.50	TQEX
GENMAB A/S	01-Apr-2025	15:25:17 PM	22	1322.50	TQEX
GENMAB A/S	01-Apr-2025	15:25:17 PM	5	1322.50	TQEX
GENMAB A/S	01-Apr-2025	15:25:17 PM	20	1322.50	CEUX
GENMAB A/S	01-Apr-2025	15:26:04 PM	81	1322.00	XCSE
GENMAB A/S	01-Apr-2025	15:26:04 PM	82	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:26:05 PM	36	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:26:05 PM	26	1322.00	CEUX
GENMAB A/S	01-Apr-2025	15:26:30 PM	86	1321.00	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	38	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	30	1321.50	XCSE

101

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:26:30 PM	3	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	9	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	5	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	5	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	4	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	9	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	5	1321.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	11	1320.00	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	38	1320.00	XCSE
GENMAB A/S	01-Apr-2025	15:26:30 PM	23	1321.50	TQEX
GENMAB A/S	01-Apr-2025	15:26:30 PM	5	1320.50	TQEX
GENMAB A/S	01-Apr-2025	15:26:30 PM	20	1320.50	TQEX
GENMAB A/S	01-Apr-2025	15:26:30 PM	15	1321.50	AQEU
GENMAB A/S	01-Apr-2025	15:26:30 PM	3	1321.50	AQEU
GENMAB A/S	01-Apr-2025	15:26:30 PM	3	1321.50	AQEU
GENMAB A/S	01-Apr-2025	15:26:30 PM	2	1321.50	AQEU
GENMAB A/S	01-Apr-2025	15:26:30 PM	83	1321.00	CEUX
GENMAB A/S	01-Apr-2025	15:26:30 PM	33	1319.50	CEUX
GENMAB A/S	01-Apr-2025	15:26:31 PM	1	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:32 PM	40	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:32 PM	39	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:32 PM	66	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:32 PM	38	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:26:32 PM	52	1319.50	CEUX
GENMAB A/S	01-Apr-2025	15:27:00 PM	2	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:27:00 PM	3	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:27:00 PM	30	1319.50	XCSE
GENMAB A/S	01-Apr-2025	15:27:24 PM	5	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:27:38 PM	9	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	85	1318.50	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	6	1318.50	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	38	1318.50	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	12	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	9	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	38	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	5	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	62	1318.50	XCSE
GENMAB A/S	01-Apr-2025	15:27:41 PM	23	1318.50	AQEU
GENMAB A/S	01-Apr-2025	15:27:41 PM	86	1318.50	CEUX
GENMAB A/S	01-Apr-2025	15:28:00 PM	85	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:28:26 PM	23	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:28:26 PM	43	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:28:34 PM	18	1319.00	CEUX
GENMAB A/S	01-Apr-2025	15:29:30 PM	36	1319.00	CEUX
GENMAB A/S	01-Apr-2025	15:29:31 PM	23	1319.00	CEUX

102

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:29:46 PM	9	1319.50	CEUX
GENMAB A/S	01-Apr-2025	15:29:46 PM	13	1319.50	CEUX
GENMAB A/S	01-Apr-2025	15:29:46 PM	86	1319.50	CEUX
GENMAB A/S	01-Apr-2025	15:30:00 PM	83	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:00 PM	31	1318.50	TQEX
GENMAB A/S	01-Apr-2025	15:30:00 PM	27	1319.50	TQEX
GENMAB A/S	01-Apr-2025	15:30:00 PM	85	1318.50	CEUX
GENMAB A/S	01-Apr-2025	15:30:00 PM	82	1319.50	CEUX
GENMAB A/S	01-Apr-2025	15:30:00 PM	65	1318.50	CEUX
GENMAB A/S	01-Apr-2025	15:30:05 PM	30	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	38	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	10	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	12	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	10	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	8	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	38	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	12	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	12	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	11	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	33	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:05 PM	17	1318.50	CEUX
GENMAB A/S	01-Apr-2025	15:30:15 PM	12	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:15 PM	38	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:15 PM	12	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:15 PM	9	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:15 PM	33	1319.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:25 PM	81	1318.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:32 PM	18	1317.50	CEUX
GENMAB A/S	01-Apr-2025	15:30:32 PM	62	1317.50	CEUX
GENMAB A/S	01-Apr-2025	15:30:36 PM	83	1317.00	XCSE
GENMAB A/S	01-Apr-2025	15:30:36 PM	29	1317.00	TQEX
GENMAB A/S	01-Apr-2025	15:30:36 PM	2	1317.00	TQEX
GENMAB A/S	01-Apr-2025	15:30:51 PM	44	1317.50	XCSE
GENMAB A/S	01-Apr-2025	15:30:51 PM	12	1317.50	XCSE
GENMAB A/S	01-Apr-2025	15:30:51 PM	50	1317.50	XCSE
GENMAB A/S	01-Apr-2025	15:30:51 PM	2	1317.50	XCSE
GENMAB A/S	01-Apr-2025	15:30:51 PM	20	1318.00	TQEX
GENMAB A/S	01-Apr-2025	15:31:02 PM	80	1317.00	XCSE
GENMAB A/S	01-Apr-2025	15:31:02 PM	34	1317.00	CEUX
GENMAB A/S	01-Apr-2025	15:31:02 PM	49	1317.00	CEUX
GENMAB A/S	01-Apr-2025	15:31:05 PM	86	1316.00	XCSE
GENMAB A/S	01-Apr-2025	15:31:05 PM	39	1316.00	CEUX
GENMAB A/S	01-Apr-2025	15:31:05 PM	24	1316.00	CEUX
GENMAB A/S	01-Apr-2025	15:31:17 PM	24	1315.50	XCSE
GENMAB A/S	01-Apr-2025	15:31:18 PM	29	1315.50	XCSE

103

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:31:21 PM	43	1315.00	CEUX
GENMAB A/S	01-Apr-2025	15:31:27 PM	84	1314.50	XCSE
GENMAB A/S	01-Apr-2025	15:31:27 PM	31	1315.00	XCSE
GENMAB A/S	01-Apr-2025	15:31:27 PM	30	1315.00	XCSE
GENMAB A/S	01-Apr-2025	15:31:27 PM	10	1315.00	XCSE
GENMAB A/S	01-Apr-2025	15:31:27 PM	37	1315.00	XCSE
GENMAB A/S	01-Apr-2025	15:31:50 PM	80	1314.50	XCSE
GENMAB A/S	01-Apr-2025	15:31:50 PM	81	1313.50	XCSE
GENMAB A/S	01-Apr-2025	15:31:50 PM	37	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:31:50 PM	46	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:31:50 PM	27	1314.50	TQEX
GENMAB A/S	01-Apr-2025	15:31:50 PM	1	1314.50	TQEX
GENMAB A/S	01-Apr-2025	15:31:50 PM	8	1313.50	TQEX
GENMAB A/S	01-Apr-2025	15:31:50 PM	20	1313.50	TQEX
GENMAB A/S	01-Apr-2025	15:31:50 PM	38	1314.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:50 PM	21	1314.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:50 PM	16	1314.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:50 PM	4	1313.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:50 PM	38	1313.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:50 PM	25	1313.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:50 PM	5	1312.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:50 PM	51	1312.50	CEUX
GENMAB A/S	01-Apr-2025	15:31:54 PM	5	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:32:16 PM	16	1316.00	CEUX
GENMAB A/S	01-Apr-2025	15:32:16 PM	47	1316.00	CEUX
GENMAB A/S	01-Apr-2025	15:32:43 PM	86	1315.50	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	38	1315.50	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	22	1315.50	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	47	1315.50	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	1	1315.50	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	58	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	25	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	2	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:32:43 PM	24	1314.50	TQEX
GENMAB A/S	01-Apr-2025	15:32:43 PM	67	1315.00	CEUX
GENMAB A/S	01-Apr-2025	15:32:43 PM	35	1314.00	CEUX
GENMAB A/S	01-Apr-2025	15:32:43 PM	18	1314.00	CEUX
GENMAB A/S	01-Apr-2025	15:32:44 PM	10	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:32:56 PM	61	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:33:04 PM	27	1312.50	CEUX
GENMAB A/S	01-Apr-2025	15:33:52 PM	17	1312.00	TQEX
GENMAB A/S	01-Apr-2025	15:33:52 PM	6	1312.00	TQEX
GENMAB A/S	01-Apr-2025	15:33:53 PM	79	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:07 PM	55	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:34:07 PM	38	1311.00	XCSE

104

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:34:07 PM	15	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:34:07 PM	22	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:07 PM	57	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:07 PM	24	1311.00	TQEX
GENMAB A/S	01-Apr-2025	15:34:07 PM	50	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:34:16 PM	23	1310.00	TQEX
GENMAB A/S	01-Apr-2025	15:34:29 PM	84	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:29 PM	26	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:29 PM	26	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:29 PM	11	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:29 PM	12	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:34:29 PM	83	1310.50	CEUX
GENMAB A/S	01-Apr-2025	15:36:01 PM	82	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:02 PM	38	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:02 PM	25	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:02 PM	11	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:02 PM	10	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:02 PM	12	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:02 PM	12	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:02 PM	25	1313.50	TQEX
GENMAB A/S	01-Apr-2025	15:36:02 PM	79	1313.50	CEUX
GENMAB A/S	01-Apr-2025	15:36:02 PM	20	1313.50	CEUX
GENMAB A/S	01-Apr-2025	15:36:05 PM	82	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:05 PM	10	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:36:06 PM	24	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:06 PM	44	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:06 PM	12	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:06 PM	25	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:06 PM	4	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:06 PM	23	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:36:06 PM	25	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:36:06 PM	8	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:36:06 PM	14	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:36:37 PM	20	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:37 PM	50	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:37 PM	9	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:37 PM	8	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:37 PM	21	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:48 PM	9	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:48 PM	38	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:48 PM	9	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:49 PM	9	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:49 PM	38	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:49 PM	44	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:49 PM	9	1314.00	XCSE

105

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:36:50 PM	38	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:50 PM	44	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:50 PM	9	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:50 PM	85	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:36:51 PM	25	1312.50	TQEX
GENMAB A/S	01-Apr-2025	15:36:51 PM	19	1312.50	CEUX
GENMAB A/S	01-Apr-2025	15:36:51 PM	63	1312.50	CEUX
GENMAB A/S	01-Apr-2025	15:37:15 PM	84	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:37:15 PM	26	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:37:15 PM	60	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:37:15 PM	9	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:37:15 PM	26	1311.50	TQEX
GENMAB A/S	01-Apr-2025	15:37:15 PM	36	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:37:15 PM	80	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:37:34 PM	24	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:37:34 PM	38	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:37:34 PM	46	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:37:34 PM	81	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:37:39 PM	54	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:37:39 PM	28	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:37:53 PM	12	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:37:53 PM	10	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:37:53 PM	9	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:37:53 PM	26	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	80	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	11	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	12	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	12	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	38	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	10	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	9	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	12	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	38	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:38:28 PM	23	1312.50	TQEX
GENMAB A/S	01-Apr-2025	15:38:28 PM	2	1312.50	TQEX
GENMAB A/S	01-Apr-2025	15:38:28 PM	79	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:39:16 PM	40	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:39:16 PM	35	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:39:16 PM	33	1312.50	XCSE
GENMAB A/S	01-Apr-2025	15:39:46 PM	82	1313.50	XCSE
GENMAB A/S	01-Apr-2025	15:39:46 PM	26	1313.50	TQEX
GENMAB A/S	01-Apr-2025	15:39:54 PM	33	1313.50	XCSE
GENMAB A/S	01-Apr-2025	15:39:54 PM	16	1313.50	CEUX
GENMAB A/S	01-Apr-2025	15:40:02 PM	33	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:40:02 PM	12	1313.00	XCSE

106

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:40:02 PM	38	1313.50	XCSE
GENMAB A/S	01-Apr-2025	15:40:02 PM	25	1313.50	XCSE
GENMAB A/S	01-Apr-2025	15:40:02 PM	24	1312.50	TQEX
GENMAB A/S	01-Apr-2025	15:40:02 PM	84	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:40:03 PM	23	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:40:03 PM	53	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:40:03 PM	9	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:40:03 PM	11	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:40:03 PM	10	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:40:27 PM	11	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:40:27 PM	69	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	24	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	31	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	3	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	10	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	11	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	34	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	31	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	9	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:10 PM	27	1313.50	TQEX
GENMAB A/S	01-Apr-2025	15:41:15 PM	12	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:15 PM	12	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:15 PM	38	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:15 PM	8	1314.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:16 PM	30	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:16 PM	49	1313.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:16 PM	79	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:41:16 PM	10	1313.00	CEUX
GENMAB A/S	01-Apr-2025	15:41:42 PM	82	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:41:42 PM	82	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:41:42 PM	36	1312.50	CEUX
GENMAB A/S	01-Apr-2025	15:41:45 PM	32	1312.50	CEUX
GENMAB A/S	01-Apr-2025	15:42:18 PM	37	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:42:19 PM	80	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:42:19 PM	25	1312.00	TQEX
GENMAB A/S	01-Apr-2025	15:42:19 PM	3	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:42:19 PM	77	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:42:50 PM	27	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:42:50 PM	5	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:43:26 PM	14	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:44:14 PM	60	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:44:14 PM	21	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:44:14 PM	45	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:44:14 PM	83	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:45:21 PM	86	1309.50	XCSE

107

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:45:21 PM	70	1309.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:21 PM	20	1309.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:21 PM	18	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:45:21 PM	80	1309.50	CEUX
GENMAB A/S	01-Apr-2025	15:45:22 PM	41	1309.00	XCSE
GENMAB A/S	01-Apr-2025	15:45:22 PM	83	1309.00	CEUX
GENMAB A/S	01-Apr-2025	15:45:27 PM	2	1309.00	XCSE
GENMAB A/S	01-Apr-2025	15:45:44 PM	83	1308.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:44 PM	83	1308.50	CEUX
GENMAB A/S	01-Apr-2025	15:45:44 PM	2	1308.50	CEUX
GENMAB A/S	01-Apr-2025	15:45:58 PM	41	1308.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:58 PM	10	1308.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:58 PM	12	1308.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:58 PM	10	1308.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:58 PM	35	1308.50	XCSE
GENMAB A/S	01-Apr-2025	15:45:58 PM	23	1308.00	TQEX
GENMAB A/S	01-Apr-2025	15:45:58 PM	31	1307.50	CEUX
GENMAB A/S	01-Apr-2025	15:46:45 PM	13	1309.00	XCSE
GENMAB A/S	01-Apr-2025	15:46:45 PM	72	1309.00	XCSE
GENMAB A/S	01-Apr-2025	15:46:45 PM	71	1309.00	XCSE
GENMAB A/S	01-Apr-2025	15:46:45 PM	21	1309.00	XCSE
GENMAB A/S	01-Apr-2025	15:46:45 PM	16	1309.00	XCSE
GENMAB A/S	01-Apr-2025	15:46:45 PM	83	1309.00	CEUX
GENMAB A/S	01-Apr-2025	15:47:35 PM	80	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:47:35 PM	80	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:47:55 PM	47	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:47:55 PM	12	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:47:55 PM	41	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:47:55 PM	31	1309.50	TQEX
GENMAB A/S	01-Apr-2025	15:48:09 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	41	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	31	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	6	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	74	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:09 PM	1	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	51	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	38	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	8	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	4	1311.50	XCSE

108

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:48:10 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	3	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	38	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	41	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:10 PM	1	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	74	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	16	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	41	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:11 PM	35	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:48:16 PM	30	1311.50	TQEX
GENMAB A/S	01-Apr-2025	15:49:26 PM	82	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:26 PM	42	1311.00	AQEU
GENMAB A/S	01-Apr-2025	15:49:26 PM	10	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:49:26 PM	36	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:49:27 PM	15	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	58	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:49:27 PM	24	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:49:27 PM	4	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:49:27 PM	28	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:49:28 PM	13	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:49:28 PM	6	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:49:28 PM	5	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:49:28 PM	6	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:49:28 PM	18	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:49:28 PM	80	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:49:54 PM	24	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:50:17 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:50:17 PM	74	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:50:17 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:50:17 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:50:17 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:50:17 PM	28	1311.00	TQEX
GENMAB A/S	01-Apr-2025	15:50:17 PM	79	1311.00	CEUX

109

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:50:17 PM	36	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:50:17 PM	5	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:50:17 PM	6	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:50:17 PM	6	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:50:18 PM	35	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:51:26 PM	19	1310.50	AQEU
GENMAB A/S	01-Apr-2025	15:51:26 PM	5	1310.50	AQEU
GENMAB A/S	01-Apr-2025	15:51:27 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:51:27 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:51:27 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:51:27 PM	1	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:51:27 PM	58	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:51:27 PM	15	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:51:27 PM	24	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:51:27 PM	1	1310.50	CEUX
GENMAB A/S	01-Apr-2025	15:51:27 PM	22	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:51:27 PM	13	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:15 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:52:15 PM	51	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:52:15 PM	16	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:52:16 PM	108	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:52:16 PM	25	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:52:26 PM	80	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:52:26 PM	40	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:52:26 PM	9	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:52:26 PM	86	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:26 PM	15	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:26 PM	6	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:26 PM	5	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:26 PM	5	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:26 PM	8	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:26 PM	28	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:52:27 PM	5	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:53:01 PM	10	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:53:01 PM	36	1310.50	CEUX
GENMAB A/S	01-Apr-2025	15:53:06 PM	36	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:53:06 PM	37	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:53:06 PM	35	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:53:06 PM	20	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:53:06 PM	23	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:54:54 PM	7	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:54:54 PM	86	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:55:26 PM	9	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:55:26 PM	3	1311.50	CEUX
GENMAB A/S	01-Apr-2025	15:55:48 PM	41	1311.50	XCSE

110

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:55:48 PM	15	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:48 PM	38	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:48 PM	14	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:48 PM	33	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:48 PM	25	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:55:49 PM	44	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	38	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:49 PM	15	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:55:50 PM	38	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:50 PM	38	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:50 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:50 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:50 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:50 PM	25	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:50 PM	15	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:55:50 PM	24	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:55:50 PM	10	1310.50	CEUX
GENMAB A/S	01-Apr-2025	15:55:50 PM	36	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:55:51 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:55:51 PM	38	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:55:51 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:56:14 PM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:14 PM	6	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:14 PM	36	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:14 PM	6	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:15 PM	69	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:56:27 PM	36	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:29 PM	36	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:34 PM	13	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:40 PM	10	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:56:40 PM	11	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:56:40 PM	10	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:56:40 PM	17	1312.00	XCSE
GENMAB A/S	01-Apr-2025	15:56:40 PM	65	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:40 PM	19	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:40 PM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:40 PM	56	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:40 PM	25	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:41 PM	63	1311.50	XCSE

111

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:56:41 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:41 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:41 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:41 PM	15	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:41 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:41 PM	32	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	44	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	29	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	32	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:42 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:56:46 PM	80	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:56:46 PM	31	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:56:46 PM	84	1311.00	CEUX
GENMAB A/S	01-Apr-2025	15:56:46 PM	20	1310.50	CEUX
GENMAB A/S	01-Apr-2025	15:57:37 PM	30	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:58:30 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:30 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:30 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:30 PM	6	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:30 PM	50	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:30 PM	14	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:31 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:31 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:31 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:31 PM	30	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:31 PM	46	1311.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:31 PM	20	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:58:31 PM	3	1310.50	TQEX
GENMAB A/S	01-Apr-2025	15:58:31 PM	27	1310.50	AQEU
GENMAB A/S	01-Apr-2025	15:58:54 PM	85	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:58:54 PM	11	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:58:54 PM	12	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:58:54 PM	12	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:58:54 PM	37	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:58:54 PM	36	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:54 PM	38	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:58:54 PM	20	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:58:54 PM	27	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:58:54 PM	20	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:58:54 PM	5	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:58:54 PM	6	1310.00	CEUX

112

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	15:58:54 PM	5	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:58:55 PM	11	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:55 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:55 PM	10	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:55 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:55 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:55 PM	10	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:58:55 PM	30	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:59:18 PM	4	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:59:19 PM	86	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:19 PM	27	1310.00	TQEX
GENMAB A/S	01-Apr-2025	15:59:19 PM	81	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:59:26 PM	65	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	12	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	1	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	49	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	30	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	18	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	11	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	1	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:26 PM	5	1310.00	CEUX
GENMAB A/S	01-Apr-2025	15:59:27 PM	9	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:27 PM	12	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:27 PM	11	1310.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	10	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	10	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	50	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	1	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	15:59:59 PM	6	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:00:00 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:00:00 PM	12	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:00:00 PM	10	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:00:00 PM	26	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:00:00 PM	36	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:00:00 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:00:00 PM	3	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:00:01 PM	81	1309.00	XCSE

113

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:00:01 PM	24	1309.00	TQEX
GENMAB A/S	01-Apr-2025	16:00:01 PM	85	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:00:03 PM	86	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:00:03 PM	23	1307.50	TQEX
GENMAB A/S	01-Apr-2025	16:00:03 PM	83	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:00:20 PM	50	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:00:48 PM	41	1308.50	TQEX
GENMAB A/S	01-Apr-2025	16:00:48 PM	25	1308.50	AQEU
GENMAB A/S	01-Apr-2025	16:00:48 PM	75	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:00:48 PM	7	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:01:01 PM	14	1308.50	AQEU
GENMAB A/S	01-Apr-2025	16:01:14 PM	32	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:01:14 PM	10	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:01:14 PM	18	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:01:26 PM	26	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:01:27 PM	23	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:02:04 PM	82	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:02:04 PM	23	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:02:04 PM	36	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:02:25 PM	20	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:02:25 PM	61	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:02:25 PM	30	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:02:25 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:02:25 PM	41	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:02:25 PM	26	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:02:25 PM	36	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:02:25 PM	81	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:02:25 PM	62	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:02:26 PM	1	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:02:26 PM	1	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:03:03 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:03:30 PM	86	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:03:30 PM	36	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:03:30 PM	80	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:03:40 PM	35	1311.00	TQEX
GENMAB A/S	01-Apr-2025	16:03:40 PM	83	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:03:41 PM	5	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:03:41 PM	6	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:03:41 PM	6	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:03:41 PM	28	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:03:42 PM	83	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:04:14 PM	39	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:04:14 PM	45	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:04:14 PM	52	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:04:39 PM	41	1311.50	TQEX

114

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:05:02 PM	36	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:03 PM	27	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:03 PM	9	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:05 PM	36	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:06 PM	36	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:10 PM	36	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:05:10 PM	66	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:05:11 PM	19	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:05:11 PM	61	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:05:11 PM	28	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:05:19 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:05:27 PM	4	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:05:38 PM	41	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:05:38 PM	36	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:05:52 PM	85	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:52 PM	31	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:52 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:52 PM	20	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:52 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:52 PM	6	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:52 PM	86	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:52 PM	27	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:53 PM	3	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	39	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	20	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	37	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	4	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	36	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	39	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	13	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	19	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:53 PM	16	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:05:58 PM	54	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:05:58 PM	4	1310.00	AQEU
GENMAB A/S	01-Apr-2025	16:05:58 PM	25	1310.00	AQEU
GENMAB A/S	01-Apr-2025	16:05:58 PM	64	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:06:13 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:06:13 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:06:13 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:06:13 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:06:13 PM	11	1311.00	XCSE

115

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:06:16 PM	85	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:07:02 PM	3	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:07:02 PM	51	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:07:02 PM	29	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:07:02 PM	15	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:07:26 PM	11	1310.00	AQEU
GENMAB A/S	01-Apr-2025	16:07:26 PM	12	1310.00	AQEU
GENMAB A/S	01-Apr-2025	16:07:26 PM	81	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:07:31 PM	84	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:07:44 PM	14	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:07:44 PM	28	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:08:25 PM	26	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:08:25 PM	36	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:08:25 PM	27	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:09:26 PM	36	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:09:43 PM	36	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:09:43 PM	82	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:09:44 PM	25	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:09:44 PM	9	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:09:44 PM	4	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:09:59 PM	22	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:09:59 PM	18	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:10:36 PM	36	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:10:36 PM	5	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:10:36 PM	6	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:11:26 PM	38	1311.00	TQEX
GENMAB A/S	01-Apr-2025	16:11:26 PM	85	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:11:40 PM	27	1313.50	TQEX
GENMAB A/S	01-Apr-2025	16:11:40 PM	25	1313.50	CEUX
GENMAB A/S	01-Apr-2025	16:11:40 PM	5	1314.00	CEUX
GENMAB A/S	01-Apr-2025	16:11:40 PM	5	1314.00	CEUX
GENMAB A/S	01-Apr-2025	16:11:40 PM	61	1313.50	CEUX
GENMAB A/S	01-Apr-2025	16:12:19 PM	81	1313.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:19 PM	34	1313.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:19 PM	32	1313.00	CEUX
GENMAB A/S	01-Apr-2025	16:12:23 PM	31	1313.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:23 PM	6	1313.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:23 PM	22	1313.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:23 PM	3	1312.50	TQEX
GENMAB A/S	01-Apr-2025	16:12:23 PM	25	1312.50	TQEX
GENMAB A/S	01-Apr-2025	16:12:23 PM	9	1312.50	CEUX
GENMAB A/S	01-Apr-2025	16:12:23 PM	70	1312.50	CEUX
GENMAB A/S	01-Apr-2025	16:12:28 PM	33	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:28 PM	5	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:28 PM	43	1312.00	XCSE

116

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:12:28 PM	41	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:28 PM	22	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:12:44 PM	28	1311.50	TQEX
GENMAB A/S	01-Apr-2025	16:12:44 PM	51	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:12:44 PM	33	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:12:59 PM	80	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:08 PM	108	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:08 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:27 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:27 PM	13	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:27 PM	30	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:27 PM	24	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:28 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:28 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:28 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:28 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:28 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:28 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:13:28 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:07 PM	41	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:07 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:07 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:07 PM	80	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:07 PM	37	1310.50	TQEX
GENMAB A/S	01-Apr-2025	16:14:07 PM	32	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:14:07 PM	86	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:14:08 PM	23	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:08 PM	41	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:08 PM	21	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:08 PM	9	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:08 PM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:08 PM	4	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:09 PM	21	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:09 PM	41	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:09 PM	69	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:14:11 PM	80	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	50	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	22	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	23	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	9	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	12	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	12	1308.50	XCSE

117

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:14:11 PM	19	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	11	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	11	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	1	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	11	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	9	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	12	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	11	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	41	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:11 PM	4	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:14:13 PM	23	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:14:20 PM	33	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:20 PM	1	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:14:20 PM	47	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:15:09 PM	9	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:15:09 PM	9	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:15:09 PM	10	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:15:09 PM	9	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:15:12 PM	12	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:15:12 PM	85	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:15:40 PM	80	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:15:48 PM	79	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:15:48 PM	22	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:15:48 PM	14	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:16:27 PM	2	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:17:10 PM	43	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:17:10 PM	36	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:18:05 PM	18	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:18:05 PM	34	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:18:07 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:18:07 PM	36	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:18:07 PM	41	1307.50	AQEU
GENMAB A/S	01-Apr-2025	16:18:16 PM	17	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:18:29 PM	35	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:18:29 PM	18	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:18:49 PM	39	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:18:49 PM	32	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:19:04 PM	32	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:19:04 PM	41	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:19:28 PM	82	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:19:30 PM	9	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:19:30 PM	17	1307.50	XCSE

118

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:19:40 PM	30	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:19:50 PM	38	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:19:51 PM	4	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:04 PM	6	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:08 PM	39	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	6	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	22	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	33	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:08 PM	37	1307.00	TQEX
GENMAB A/S	01-Apr-2025	16:20:09 PM	5	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:09 PM	6	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:09 PM	21	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:10 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:10 PM	34	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:10 PM	47	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:10 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:10 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:10 PM	5	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:13 PM	8	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:13 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:13 PM	9	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:13 PM	9	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:13 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:13 PM	36	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:13 PM	1	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:24 PM	65	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:20:39 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:39 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:39 PM	9	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:40 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:40 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:44 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	15	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	31	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	21	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	31	1307.50	XCSE

119

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:20:56 PM	13	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	7	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	73	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:20:56 PM	37	1307.00	TQEX
GENMAB A/S	01-Apr-2025	16:20:56 PM	32	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:20:56 PM	73	1306.50	CEUX
GENMAB A/S	01-Apr-2025	16:21:22 PM	79	1305.50	XCSE
GENMAB A/S	01-Apr-2025	16:21:22 PM	53	1305.50	CEUX
GENMAB A/S	01-Apr-2025	16:21:22 PM	7	1305.50	CEUX
GENMAB A/S	01-Apr-2025	16:21:46 PM	85	1305.00	XCSE
GENMAB A/S	01-Apr-2025	16:21:46 PM	52	1305.50	XCSE
GENMAB A/S	01-Apr-2025	16:21:46 PM	41	1305.50	XCSE
GENMAB A/S	01-Apr-2025	16:21:46 PM	15	1305.50	XCSE
GENMAB A/S	01-Apr-2025	16:21:46 PM	32	1305.00	CEUX
GENMAB A/S	01-Apr-2025	16:21:47 PM	81	1305.00	XCSE
GENMAB A/S	01-Apr-2025	16:22:45 PM	9	1305.00	XCSE
GENMAB A/S	01-Apr-2025	16:23:52 PM	86	1306.00	XCSE
GENMAB A/S	01-Apr-2025	16:24:27 PM	83	1306.00	XCSE
GENMAB A/S	01-Apr-2025	16:24:27 PM	80	1306.00	CEUX
GENMAB A/S	01-Apr-2025	16:24:39 PM	3	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:24:39 PM	7	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:24:48 PM	13	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:25:25 PM	18	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:25:25 PM	18	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:25:29 PM	79	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:25:29 PM	83	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:25:30 PM	25	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:25:30 PM	31	1308.00	AQEU
GENMAB A/S	01-Apr-2025	16:26:25 PM	36	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:26:42 PM	1	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:26:42 PM	10	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:26:59 PM	41	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:26:59 PM	14	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:26:59 PM	31	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:26:59 PM	22	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:26:59 PM	29	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:26:59 PM	26	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:27:25 PM	3	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:27:25 PM	76	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:27:25 PM	43	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:27:25 PM	14	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:27:25 PM	58	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:25 PM	21	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:25 PM	6	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:25 PM	36	1307.50	CEUX

120

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:27:25 PM	5	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:25 PM	6	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:25 PM	6	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:25 PM	5	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:25 PM	9	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:27:26 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:27:26 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:10 PM	27	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:10 PM	13	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:10 PM	31	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:10 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:10 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:10 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:10 PM	26	1307.00	TQEX
GENMAB A/S	01-Apr-2025	16:28:10 PM	36	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:28:11 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	9	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	9	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	9	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	35	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:11 PM	2	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:12 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:12 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:12 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:12 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:12 PM	32	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:12 PM	43	1306.50	CEUX
GENMAB A/S	01-Apr-2025	16:28:15 PM	1	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	1	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	83	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	29	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	41	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	12	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	10	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	11	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	5	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:28:15 PM	37	1306.50	CEUX
GENMAB A/S	01-Apr-2025	16:28:23 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:23 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:23 PM	7	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:47 PM	15	1307.50	XCSE

121

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:28:47 PM	65	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:47 PM	39	1307.50	TQEX
GENMAB A/S	01-Apr-2025	16:28:47 PM	25	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:28:55 PM	27	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:55 PM	39	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:28:55 PM	18	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:29:02 PM	16	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:29:33 PM	75	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:29:33 PM	12	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:29:33 PM	26	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:29:33 PM	10	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:29:33 PM	10	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:29:33 PM	41	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:29:33 PM	36	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:29:33 PM	84	1306.50	CEUX
GENMAB A/S	01-Apr-2025	16:29:56 PM	85	1305.50	XCSE
GENMAB A/S	01-Apr-2025	16:30:10 PM	86	1305.00	CEUX
GENMAB A/S	01-Apr-2025	16:30:13 PM	61	1305.00	CEUX
GENMAB A/S	01-Apr-2025	16:30:15 PM	61	1304.50	XCSE
GENMAB A/S	01-Apr-2025	16:30:16 PM	82	1304.00	CEUX
GENMAB A/S	01-Apr-2025	16:31:19 PM	10	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:31:19 PM	11	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:31:21 PM	10	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:31:21 PM	41	1306.50	XCSE
GENMAB A/S	01-Apr-2025	16:31:24 PM	84	1306.00	XCSE
GENMAB A/S	01-Apr-2025	16:31:24 PM	34	1306.00	TQEX
GENMAB A/S	01-Apr-2025	16:31:24 PM	69	1306.00	CEUX
GENMAB A/S	01-Apr-2025	16:31:26 PM	15	1306.00	XCSE
GENMAB A/S	01-Apr-2025	16:32:00 PM	41	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:32:00 PM	38	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:32:00 PM	15	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:32:08 PM	10	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:32:08 PM	41	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:32:09 PM	34	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:32:41 PM	36	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:32:42 PM	13	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:32:52 PM	18	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:32:57 PM	36	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:33:05 PM	46	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:33:07 PM	12	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:33:07 PM	41	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:33:07 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:33:07 PM	33	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:33:10 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:33:10 PM	41	1308.00	XCSE

122

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:33:25 PM	33	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:33:25 PM	11	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:33:25 PM	12	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:33:25 PM	41	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:33:26 PM	6	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:33:48 PM	7	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:33:48 PM	6	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:33:48 PM	6	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:33:48 PM	9	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:33:53 PM	79	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:33:53 PM	23	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:33:53 PM	22	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:34:05 PM	36	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:16 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:16 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:16 PM	21	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:16 PM	41	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:16 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:16 PM	17	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:35 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:35 PM	41	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:35 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:35 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:35 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:35 PM	15	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:45 PM	11	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:34:45 PM	14	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:34:45 PM	81	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:34:55 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:55 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:55 PM	41	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:55 PM	33	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:34:55 PM	15	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:35:26 PM	10	1307.50	XCSE
GENMAB A/S	01-Apr-2025	16:35:26 PM	16	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:36:25 PM	82	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:36:25 PM	19	1307.00	TQEX
GENMAB A/S	01-Apr-2025	16:36:25 PM	83	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:36:26 PM	15	1307.00	TQEX
GENMAB A/S	01-Apr-2025	16:36:26 PM	34	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:36:26 PM	25	1307.00	AQEU
GENMAB A/S	01-Apr-2025	16:36:26 PM	8	1307.00	AQEU
GENMAB A/S	01-Apr-2025	16:37:25 PM	31	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:37:25 PM	36	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:37:26 PM	18	1307.00	XCSE

123

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:37:26 PM	2	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:37:26 PM	34	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:37:27 PM	23	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:37:27 PM	32	1307.00	XCSE
GENMAB A/S	01-Apr-2025	16:37:27 PM	15	1307.00	CEUX
GENMAB A/S	01-Apr-2025	16:38:12 PM	4	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:38:16 PM	18	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:38:28 PM	86	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:38:28 PM	27	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:38:28 PM	84	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:38:28 PM	36	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:38:28 PM	6	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:38:28 PM	32	1308.00	AQEU
GENMAB A/S	01-Apr-2025	16:38:29 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:39:45 PM	56	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:39:45 PM	41	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:39:45 PM	11	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:39:45 PM	36	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:39:45 PM	79	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:39:45 PM	37	1309.00	AQEU
GENMAB A/S	01-Apr-2025	16:39:46 PM	60	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:39:46 PM	26	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:39:46 PM	45	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:40:01 PM	41	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:40:01 PM	31	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:40:01 PM	21	1308.50	TQEX
GENMAB A/S	01-Apr-2025	16:40:01 PM	9	1308.50	TQEX
GENMAB A/S	01-Apr-2025	16:40:01 PM	30	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:40:01 PM	36	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:40:01 PM	5	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:40:01 PM	6	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:40:06 PM	9	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:40:35 PM	18	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:41:26 PM	52	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:41:28 PM	17	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:41:29 PM	23	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:41:31 PM	85	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:41:31 PM	85	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:41:31 PM	36	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:41:31 PM	45	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:41:34 PM	5	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:42:03 PM	57	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:42:03 PM	25	1308.50	TQEX
GENMAB A/S	01-Apr-2025	16:42:21 PM	25	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:42:21 PM	86	1308.00	CEUX

124

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:42:21 PM	20	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:42:25 PM	55	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:42:25 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:42:25 PM	15	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:42:25 PM	5	1308.00	CEUX
GENMAB A/S	01-Apr-2025	16:43:16 PM	37	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:16 PM	52	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:16 PM	19	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:16 PM	18	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:43:17 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	30	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	50	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	30	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	12	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:17 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:19 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:19 PM	18	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:19 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:19 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:19 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:21 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:21 PM	16	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:21 PM	52	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	52	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	52	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	12	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:22 PM	12	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:23 PM	3	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:23 PM	52	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:23 PM	15	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:24 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:24 PM	52	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:24 PM	29	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:25 PM	10	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:25 PM	52	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:25 PM	29	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:43:58 PM	8	1310.50	CEUX

125

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:43:58 PM	36	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:43:59 PM	13	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:44:02 PM	16	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:44:03 PM	80	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:44:05 PM	86	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:44:20 PM	52	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:44:20 PM	30	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:44:20 PM	26	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:44:20 PM	85	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:44:20 PM	17	1310.00	TQEX
GENMAB A/S	01-Apr-2025	16:44:20 PM	31	1310.00	TQEX
GENMAB A/S	01-Apr-2025	16:45:02 PM	40	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:02 PM	18	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:45:02 PM	86	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:45:03 PM	36	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:45:03 PM	14	1309.50	AQEU
GENMAB A/S	01-Apr-2025	16:45:05 PM	9	1309.50	AQEU
GENMAB A/S	01-Apr-2025	16:45:07 PM	81	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:07 PM	32	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:07 PM	34	1309.00	TQEX
GENMAB A/S	01-Apr-2025	16:45:07 PM	20	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:45:07 PM	21	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:45:12 PM	34	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:12 PM	52	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:12 PM	22	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:12 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:12 PM	9	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:12 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:12 PM	8	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:12 PM	41	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:45:12 PM	43	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:45:27 PM	9	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:27 PM	9	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:27 PM	30	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:27 PM	5	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:45:27 PM	6	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:45:27 PM	6	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:45:28 PM	30	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:28 PM	52	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:28 PM	26	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:28 PM	4	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:28 PM	11	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:28 PM	9	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:28 PM	11	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:28 PM	13	1308.50	CEUX

126

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:45:28 PM	7	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:45:28 PM	14	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:45:28 PM	42	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:45:29 PM	30	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	9	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	30	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	11	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:29 PM	29	1308.50	CEUX
GENMAB A/S	01-Apr-2025	16:45:42 PM	84	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:42 PM	14	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:42 PM	11	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:42 PM	9	1308.00	XCSE
GENMAB A/S	01-Apr-2025	16:45:42 PM	29	1308.00	TQEX
GENMAB A/S	01-Apr-2025	16:45:42 PM	2	1307.50	CEUX
GENMAB A/S	01-Apr-2025	16:46:03 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:46:03 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:46:03 PM	11	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:46:04 PM	9	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:46:04 PM	12	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:46:04 PM	10	1309.00	XCSE
GENMAB A/S	01-Apr-2025	16:46:12 PM	1	1309.50	TQEX
GENMAB A/S	01-Apr-2025	16:46:12 PM	22	1309.50	TQEX
GENMAB A/S	01-Apr-2025	16:46:43 PM	44	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:46:43 PM	30	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	9	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	27	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	34	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	78	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	6	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:47:03 PM	25	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:47:14 PM	23	1309.50	TQEX
GENMAB A/S	01-Apr-2025	16:47:14 PM	9	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:47:14 PM	71	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:47:14 PM	35	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:47:22 PM	40	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:47:25 PM	6	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:47:36 PM	9	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:47:44 PM	9	1310.00	XCSE

127

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:47:44 PM	36	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:47:44 PM	2	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:47:44 PM	27	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:48:05 PM	80	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:05 PM	52	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:05 PM	11	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:05 PM	26	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:05 PM	11	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:05 PM	8	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:05 PM	23	1309.50	TQEX
GENMAB A/S	01-Apr-2025	16:48:05 PM	29	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:48:05 PM	50	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:48:08 PM	82	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:08 PM	31	1309.50	TQEX
GENMAB A/S	01-Apr-2025	16:48:08 PM	61	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:48:08 PM	23	1309.50	AQEU
GENMAB A/S	01-Apr-2025	16:48:10 PM	11	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	10	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	9	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	52	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	26	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	61	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	12	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	12	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:10 PM	23	1310.00	XCSE
GENMAB A/S	01-Apr-2025	16:48:11 PM	30	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:11 PM	54	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:14 PM	10	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:14 PM	9	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:14 PM	9	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:14 PM	32	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:48:25 PM	9	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:48:38 PM	10	1308.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:38 PM	4	1309.00	AQEU
GENMAB A/S	01-Apr-2025	16:48:38 PM	1	1309.00	AQEU
GENMAB A/S	01-Apr-2025	16:48:47 PM	11	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:47 PM	11	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:48:47 PM	11	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:49:02 PM	85	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:49:02 PM	31	1309.50	TQEX
GENMAB A/S	01-Apr-2025	16:49:02 PM	12	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:06 PM	79	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:49:06 PM	65	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:09 PM	9	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:24 PM	9	1309.50	CEUX

128

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:49:26 PM	34	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:49:26 PM	52	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:49:43 PM	25	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:49:43 PM	9	1309.00	CEUX
GENMAB A/S	01-Apr-2025	16:49:43 PM	19	1309.00	AQEU
GENMAB A/S	01-Apr-2025	16:49:49 PM	5	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:49 PM	21	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:50 PM	36	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:51 PM	34	1309.50	TQEX
GENMAB A/S	01-Apr-2025	16:49:51 PM	15	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:51 PM	55	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:49:51 PM	31	1309.50	CEUX
GENMAB A/S	01-Apr-2025	16:50:01 PM	52	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:50:01 PM	19	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:50:01 PM	11	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:50:01 PM	11	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:50:01 PM	11	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:50:01 PM	4	1309.50	XCSE
GENMAB A/S	01-Apr-2025	16:50:01 PM	24	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:01 PM	84	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:02 PM	108	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:02 PM	108	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:02 PM	32	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:50:16 PM	85	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:50:16 PM	23	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:16 PM	52	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:16 PM	19	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:16 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:16 PM	5	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:50:16 PM	18	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:50:17 PM	1	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:50:47 PM	38	1311.00	TQEX
GENMAB A/S	01-Apr-2025	16:50:47 PM	5	1311.00	TQEX
GENMAB A/S	01-Apr-2025	16:51:25 PM	78	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:25 PM	8	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:25 PM	35	1311.00	TQEX
GENMAB A/S	01-Apr-2025	16:51:25 PM	10	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:51:25 PM	1	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:51:26 PM	26	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:26 PM	59	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:49 PM	29	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:51:49 PM	5	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:51:49 PM	6	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:51:49 PM	6	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:51:55 PM	5	1312.00	XCSE

129

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:51:55 PM	9	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:55 PM	41	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:55 PM	31	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:55 PM	22	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:51:55 PM	7	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:51:55 PM	16	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:51:55 PM	28	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:51:55 PM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:51:55 PM	79	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:00 PM	27	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:00 PM	6	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:00 PM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:00 PM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:00 PM	6	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:01 PM	3	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	9	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	10	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	52	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	2	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	32	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	46	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	52	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	10	1312.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:01 PM	21	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:01 PM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:01 PM	5	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:01 PM	6	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:02 PM	31	1312.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:02 PM	1	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:02 PM	60	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:02 PM	30	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:04 PM	45	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:06 PM	47	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:06 PM	9	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:06 PM	10	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:06 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:06 PM	30	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:06 PM	86	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:06 PM	1	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:06 PM	2	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:06 PM	30	1310.50	AQEU
GENMAB A/S	01-Apr-2025	16:52:10 PM	82	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:10 PM	24	1310.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:11 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:11 PM	52	1311.00	XCSE

130

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:52:11 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:11 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:11 PM	6	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:11 PM	52	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:11 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:11 PM	12	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:11 PM	1	1310.50	AQEU
GENMAB A/S	01-Apr-2025	16:52:12 PM	10	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:14 PM	15	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:21 PM	11	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:25 PM	23	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:25 PM	34	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	22	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	11	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	12	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	1	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	1	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:26 PM	2	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:26 PM	12	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:26 PM	1	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:26 PM	6	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:26 PM	6	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:26 PM	6	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:52:26 PM	35	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:31 PM	37	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:34 PM	27	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:37 PM	13	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:37 PM	22	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:37 PM	5	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:37 PM	15	1311.50	AQEU
GENMAB A/S	01-Apr-2025	16:52:37 PM	8	1311.50	AQEU
GENMAB A/S	01-Apr-2025	16:52:41 PM	23	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:41 PM	46	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:52:41 PM	29	1311.00	TQEX
GENMAB A/S	01-Apr-2025	16:52:41 PM	23	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:43 PM	28	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:43 PM	24	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:52:46 PM	32	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:52:56 PM	25	1310.50	AQEU
GENMAB A/S	01-Apr-2025	16:53:01 PM	26	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:53:01 PM	30	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:53:01 PM	23	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:04 PM	26	1311.00	XCSE

131

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	01-Apr-2025	16:53:12 PM	1	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:12 PM	38	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:12 PM	25	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:12 PM	23	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:12 PM	5	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:12 PM	6	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:12 PM	6	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:12 PM	17	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:25 PM	4	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:25 PM	21	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:25 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:25 PM	9	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:25 PM	11	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:25 PM	51	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:25 PM	23	1310.50	XCSE
GENMAB A/S	01-Apr-2025	16:53:25 PM	8	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:25 PM	51	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:25 PM	2	1311.00	AQEU
GENMAB A/S	01-Apr-2025	16:53:25 PM	2	1311.00	AQEU
GENMAB A/S	01-Apr-2025	16:53:25 PM	15	1311.00	AQEU
GENMAB A/S	01-Apr-2025	16:53:26 PM	1	1310.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:39 PM	31	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:55 PM	37	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:55 PM	10	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:55 PM	19	1311.00	CEUX
GENMAB A/S	01-Apr-2025	16:53:55 PM	20	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:53:55 PM	9	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:53:59 PM	24	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:53:59 PM	13	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:54:03 PM	5	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:54:04 PM	18	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:54:10 PM	18	1311.50	CEUX
GENMAB A/S	01-Apr-2025	16:54:22 PM	33	1311.00	XCSE
GENMAB A/S	01-Apr-2025	16:54:22 PM	25	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:54:23 PM	19	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:54:23 PM	14	1311.50	XCSE
GENMAB A/S	01-Apr-2025	16:54:26 PM	31	1311.50	AQEU
GENMAB A/S	01-Apr-2025	16:54:47 PM	9	1311.50	AQEU
GENMAB A/S	01-Apr-2025	16:54:48 PM	18	1311.50	AQEU
GENMAB A/S	02-Apr-2025	09:21:59 AM	16	1272.50	CEUX
GENMAB A/S	02-Apr-2025	09:22:15 AM	54	1272.50	CEUX
GENMAB A/S	02-Apr-2025	09:22:16 AM	2	1274.50	XCSE
GENMAB A/S	02-Apr-2025	09:22:16 AM	22	1274.50	CEUX
GENMAB A/S	02-Apr-2025	09:22:16 AM	27	1274.50	CEUX
GENMAB A/S	02-Apr-2025	09:22:53 AM	68	1276.50	XCSE

132

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	09:23:10 AM	69	1277.00	TQEX
GENMAB A/S	02-Apr-2025	09:23:11 AM	78	1277.00	AQEU
GENMAB A/S	02-Apr-2025	09:23:12 AM	50	1276.50	XCSE
GENMAB A/S	02-Apr-2025	09:23:19 AM	74	1276.00	TQEX
GENMAB A/S	02-Apr-2025	09:23:19 AM	66	1276.00	AQEU
GENMAB A/S	02-Apr-2025	09:23:19 AM	38	1276.00	CEUX
GENMAB A/S	02-Apr-2025	09:23:48 AM	26	1278.00	AQEU
GENMAB A/S	02-Apr-2025	09:24:52 AM	1	1278.00	XCSE
GENMAB A/S	02-Apr-2025	09:24:52 AM	82	1278.00	XCSE
GENMAB A/S	02-Apr-2025	09:24:52 AM	23	1278.00	AQEU
GENMAB A/S	02-Apr-2025	09:24:52 AM	69	1278.00	CEUX
GENMAB A/S	02-Apr-2025	09:25:41 AM	86	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:25:42 AM	24	1280.00	TQEX
GENMAB A/S	02-Apr-2025	09:25:43 AM	38	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:25:43 AM	15	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:25:50 AM	76	1280.50	CEUX
GENMAB A/S	02-Apr-2025	09:26:07 AM	80	1280.00	XCSE
GENMAB A/S	02-Apr-2025	09:26:08 AM	14	1279.50	CEUX
GENMAB A/S	02-Apr-2025	09:26:13 AM	68	1279.50	CEUX
GENMAB A/S	02-Apr-2025	09:26:15 AM	82	1279.00	XCSE
GENMAB A/S	02-Apr-2025	09:26:15 AM	26	1279.00	TQEX
GENMAB A/S	02-Apr-2025	09:26:15 AM	82	1278.50	CEUX
GENMAB A/S	02-Apr-2025	09:26:16 AM	81	1278.00	XCSE
GENMAB A/S	02-Apr-2025	09:28:15 AM	16	1281.50	XCSE
GENMAB A/S	02-Apr-2025	09:28:15 AM	39	1281.50	XCSE
GENMAB A/S	02-Apr-2025	09:28:16 AM	39	1281.50	XCSE
GENMAB A/S	02-Apr-2025	09:28:26 AM	19	1282.50	XCSE
GENMAB A/S	02-Apr-2025	09:28:26 AM	19	1282.50	XCSE
GENMAB A/S	02-Apr-2025	09:28:55 AM	1	1281.50	XCSE
GENMAB A/S	02-Apr-2025	09:28:57 AM	84	1283.00	XCSE
GENMAB A/S	02-Apr-2025	09:28:57 AM	80	1282.50	CEUX
GENMAB A/S	02-Apr-2025	09:29:02 AM	84	1281.50	XCSE
GENMAB A/S	02-Apr-2025	09:29:02 AM	58	1281.50	CEUX
GENMAB A/S	02-Apr-2025	09:29:04 AM	20	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:29:04 AM	49	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:29:04 AM	18	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:29:04 AM	45	1280.50	CEUX
GENMAB A/S	02-Apr-2025	09:29:04 AM	17	1280.50	CEUX
GENMAB A/S	02-Apr-2025	09:29:50 AM	13	1280.50	CEUX
GENMAB A/S	02-Apr-2025	09:29:51 AM	84	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:29:51 AM	10	1280.50	CEUX
GENMAB A/S	02-Apr-2025	09:30:03 AM	82	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:30:03 AM	75	1278.00	XCSE
GENMAB A/S	02-Apr-2025	09:30:03 AM	12	1278.00	XCSE
GENMAB A/S	02-Apr-2025	09:30:03 AM	25	1279.00	CEUX

133

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	09:30:03 AM	6	1278.00	CEUX
GENMAB A/S	02-Apr-2025	09:30:38 AM	7	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:30:38 AM	26	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:30:38 AM	23	1279.00	CEUX
GENMAB A/S	02-Apr-2025	09:31:24 AM	26	1280.50	TQEX
GENMAB A/S	02-Apr-2025	09:31:30 AM	17	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:31:34 AM	20	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:32:02 AM	43	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:32:02 AM	40	1281.00	CEUX
GENMAB A/S	02-Apr-2025	09:33:31 AM	25	1281.50	TQEX
GENMAB A/S	02-Apr-2025	09:35:45 AM	87	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:45 AM	40	1286.00	CEUX
GENMAB A/S	02-Apr-2025	09:35:45 AM	47	1286.00	CEUX
GENMAB A/S	02-Apr-2025	09:35:47 AM	65	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:47 AM	24	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:47 AM	20	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:47 AM	30	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:47 AM	24	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:47 AM	39	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:47 AM	16	1286.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:51 AM	86	1285.00	XCSE
GENMAB A/S	02-Apr-2025	09:35:51 AM	41	1285.00	TQEX
GENMAB A/S	02-Apr-2025	09:35:51 AM	27	1285.00	AQEU
GENMAB A/S	02-Apr-2025	09:35:51 AM	84	1285.00	CEUX
GENMAB A/S	02-Apr-2025	09:36:37 AM	84	1283.50	XCSE
GENMAB A/S	02-Apr-2025	09:36:37 AM	25	1283.50	TQEX
GENMAB A/S	02-Apr-2025	09:36:37 AM	29	1284.00	CEUX
GENMAB A/S	02-Apr-2025	09:36:37 AM	58	1284.00	CEUX
GENMAB A/S	02-Apr-2025	09:37:12 AM	31	1283.00	TQEX
GENMAB A/S	02-Apr-2025	09:37:12 AM	6	1283.00	TQEX
GENMAB A/S	02-Apr-2025	09:37:15 AM	81	1282.00	XCSE
GENMAB A/S	02-Apr-2025	09:37:15 AM	55	1282.50	CEUX
GENMAB A/S	02-Apr-2025	09:37:17 AM	1	1281.00	CEUX
GENMAB A/S	02-Apr-2025	09:37:25 AM	43	1281.00	CEUX
GENMAB A/S	02-Apr-2025	09:37:27 AM	84	1280.50	XCSE
GENMAB A/S	02-Apr-2025	09:37:56 AM	86	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:37:56 AM	28	1279.50	CEUX
GENMAB A/S	02-Apr-2025	09:38:22 AM	79	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:38:22 AM	1	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:38:50 AM	23	1278.50	CEUX
GENMAB A/S	02-Apr-2025	09:39:29 AM	85	1278.00	XCSE
GENMAB A/S	02-Apr-2025	09:39:36 AM	29	1279.50	TQEX
GENMAB A/S	02-Apr-2025	09:39:36 AM	35	1279.50	CEUX
GENMAB A/S	02-Apr-2025	09:39:52 AM	85	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:39:52 AM	20	1279.50	TQEX

134

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	09:40:38 AM	80	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:40:38 AM	18	1278.50	CEUX
GENMAB A/S	02-Apr-2025	09:40:38 AM	18	1278.50	CEUX
GENMAB A/S	02-Apr-2025	09:42:05 AM	81	1282.00	XCSE
GENMAB A/S	02-Apr-2025	09:42:05 AM	40	1281.50	CEUX
GENMAB A/S	02-Apr-2025	09:42:06 AM	21	1281.50	TQEX
GENMAB A/S	02-Apr-2025	09:42:06 AM	7	1281.50	CEUX
GENMAB A/S	02-Apr-2025	09:42:26 AM	1	1281.00	XCSE
GENMAB A/S	02-Apr-2025	09:42:26 AM	82	1281.00	XCSE
GENMAB A/S	02-Apr-2025	09:42:26 AM	29	1280.50	CEUX
GENMAB A/S	02-Apr-2025	09:43:00 AM	4	1281.00	XCSE
GENMAB A/S	02-Apr-2025	09:43:56 AM	53	1281.00	XCSE
GENMAB A/S	02-Apr-2025	09:44:05 AM	17	1280.50	CEUX
GENMAB A/S	02-Apr-2025	09:44:27 AM	80	1280.00	XCSE
GENMAB A/S	02-Apr-2025	09:44:27 AM	26	1280.00	TQEX
GENMAB A/S	02-Apr-2025	09:44:27 AM	47	1279.50	CEUX
GENMAB A/S	02-Apr-2025	09:44:39 AM	28	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:46:00 AM	24	1279.50	TQEX
GENMAB A/S	02-Apr-2025	09:46:00 AM	71	1279.50	CEUX
GENMAB A/S	02-Apr-2025	09:48:12 AM	52	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:48:12 AM	80	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:48:12 AM	29	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:48:12 AM	34	1278.50	CEUX
GENMAB A/S	02-Apr-2025	09:48:25 AM	55	1278.00	XCSE
GENMAB A/S	02-Apr-2025	09:49:16 AM	39	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:49:16 AM	30	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:49:16 AM	15	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:49:16 AM	3	1278.50	XCSE
GENMAB A/S	02-Apr-2025	09:50:01 AM	84	1277.00	XCSE
GENMAB A/S	02-Apr-2025	09:50:01 AM	25	1277.00	TQEX
GENMAB A/S	02-Apr-2025	09:50:01 AM	54	1277.00	CEUX
GENMAB A/S	02-Apr-2025	09:51:50 AM	76	1276.50	XCSE
GENMAB A/S	02-Apr-2025	09:51:50 AM	4	1276.50	XCSE
GENMAB A/S	02-Apr-2025	09:51:50 AM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	09:51:50 AM	15	1277.00	XCSE
GENMAB A/S	02-Apr-2025	09:51:50 AM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	09:51:50 AM	17	1277.00	XCSE
GENMAB A/S	02-Apr-2025	09:51:50 AM	83	1277.00	CEUX
GENMAB A/S	02-Apr-2025	09:52:17 AM	85	1275.50	XCSE
GENMAB A/S	02-Apr-2025	09:52:17 AM	30	1275.50	XCSE
GENMAB A/S	02-Apr-2025	09:52:17 AM	25	1275.50	XCSE
GENMAB A/S	02-Apr-2025	09:52:17 AM	25	1276.00	XCSE
GENMAB A/S	02-Apr-2025	09:52:17 AM	23	1276.00	TQEX
GENMAB A/S	02-Apr-2025	09:52:17 AM	57	1276.00	CEUX
GENMAB A/S	02-Apr-2025	09:52:17 AM	24	1275.00	CEUX

135

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	09:52:27 AM	56	1275.00	CEUX
GENMAB A/S	02-Apr-2025	09:54:01 AM	80	1274.00	XCSE
GENMAB A/S	02-Apr-2025	09:54:34 AM	23	1273.50	TQEX
GENMAB A/S	02-Apr-2025	09:54:34 AM	18	1273.50	CEUX
GENMAB A/S	02-Apr-2025	09:54:34 AM	55	1273.50	CEUX
GENMAB A/S	02-Apr-2025	09:54:38 AM	82	1273.00	XCSE
GENMAB A/S	02-Apr-2025	09:55:08 AM	22	1272.50	CEUX
GENMAB A/S	02-Apr-2025	09:56:41 AM	86	1274.00	XCSE
GENMAB A/S	02-Apr-2025	09:57:33 AM	83	1275.00	XCSE
GENMAB A/S	02-Apr-2025	09:57:33 AM	85	1274.00	XCSE
GENMAB A/S	02-Apr-2025	09:57:33 AM	23	1274.50	TQEX
GENMAB A/S	02-Apr-2025	09:57:33 AM	31	1275.50	CEUX
GENMAB A/S	02-Apr-2025	09:57:33 AM	53	1275.50	CEUX
GENMAB A/S	02-Apr-2025	09:57:33 AM	86	1274.50	CEUX
GENMAB A/S	02-Apr-2025	09:57:34 AM	83	1274.00	XCSE
GENMAB A/S	02-Apr-2025	09:58:35 AM	29	1277.50	CEUX
GENMAB A/S	02-Apr-2025	09:58:35 AM	21	1277.50	CEUX
GENMAB A/S	02-Apr-2025	09:59:38 AM	31	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:59:38 AM	20	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:59:38 AM	4	1279.50	XCSE
GENMAB A/S	02-Apr-2025	09:59:47 AM	20	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:00:00 AM	33	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:00:00 AM	81	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:00:00 AM	32	1280.00	TQEX
GENMAB A/S	02-Apr-2025	10:00:00 AM	55	1279.50	CEUX
GENMAB A/S	02-Apr-2025	10:00:05 AM	81	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:00:05 AM	38	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:01:39 AM	83	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:01:39 AM	82	1277.50	XCSE
GENMAB A/S	02-Apr-2025	10:01:39 AM	4	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:01:39 AM	28	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:01:39 AM	37	1277.50	CEUX
GENMAB A/S	02-Apr-2025	10:01:39 AM	43	1276.50	CEUX
GENMAB A/S	02-Apr-2025	10:01:41 AM	18	1276.00	XCSE
GENMAB A/S	02-Apr-2025	10:01:41 AM	69	1276.00	XCSE
GENMAB A/S	02-Apr-2025	10:03:05 AM	23	1276.00	CEUX
GENMAB A/S	02-Apr-2025	10:04:12 AM	27	1276.00	TQEX
GENMAB A/S	02-Apr-2025	10:04:12 AM	32	1276.00	CEUX
GENMAB A/S	02-Apr-2025	10:04:45 AM	50	1276.00	XCSE
GENMAB A/S	02-Apr-2025	10:04:45 AM	15	1276.00	XCSE
GENMAB A/S	02-Apr-2025	10:05:00 AM	34	1275.50	XCSE
GENMAB A/S	02-Apr-2025	10:05:00 AM	24	1275.50	XCSE
GENMAB A/S	02-Apr-2025	10:05:09 AM	23	1275.00	CEUX
GENMAB A/S	02-Apr-2025	10:06:25 AM	47	1277.50	XCSE
GENMAB A/S	02-Apr-2025	10:06:25 AM	17	1277.50	XCSE

136

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	10:06:43 AM	80	1277.50	XCSE
GENMAB A/S	02-Apr-2025	10:06:44 AM	23	1277.00	TQEX
GENMAB A/S	02-Apr-2025	10:06:44 AM	14	1277.00	CEUX
GENMAB A/S	02-Apr-2025	10:06:44 AM	34	1277.00	CEUX
GENMAB A/S	02-Apr-2025	10:06:44 AM	26	1277.00	AQEU
GENMAB A/S	02-Apr-2025	10:07:01 AM	87	1276.00	XCSE
GENMAB A/S	02-Apr-2025	10:07:01 AM	57	1276.00	CEUX
GENMAB A/S	02-Apr-2025	10:07:05 AM	23	1275.50	AQEU
GENMAB A/S	02-Apr-2025	10:07:16 AM	33	1275.00	CEUX
GENMAB A/S	02-Apr-2025	10:07:16 AM	22	1275.00	CEUX
GENMAB A/S	02-Apr-2025	10:07:24 AM	87	1274.50	XCSE
GENMAB A/S	02-Apr-2025	10:09:11 AM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	10:09:11 AM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	10:09:11 AM	15	1276.50	XCSE
GENMAB A/S	02-Apr-2025	10:09:41 AM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	10:10:14 AM	35	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:10:37 AM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:10:37 AM	39	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:10:37 AM	37	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:10:42 AM	84	1276.50	XCSE
GENMAB A/S	02-Apr-2025	10:10:42 AM	26	1276.50	TQEX
GENMAB A/S	02-Apr-2025	10:10:42 AM	66	1276.50	CEUX
GENMAB A/S	02-Apr-2025	10:10:52 AM	82	1275.50	XCSE
GENMAB A/S	02-Apr-2025	10:10:52 AM	25	1275.50	TQEX
GENMAB A/S	02-Apr-2025	10:10:52 AM	49	1275.50	CEUX
GENMAB A/S	02-Apr-2025	10:15:19 AM	80	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:19 AM	25	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:19 AM	19	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:19 AM	13	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:19 AM	30	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:19 AM	22	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:19 AM	87	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:19 AM	45	1277.00	TQEX
GENMAB A/S	02-Apr-2025	10:15:19 AM	72	1277.00	CEUX
GENMAB A/S	02-Apr-2025	10:15:26 AM	85	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:15:53 AM	87	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:15:53 AM	75	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:15:53 AM	5	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:16:44 AM	83	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:16:44 AM	84	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:16:44 AM	52	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:16:44 AM	87	1277.50	CEUX
GENMAB A/S	02-Apr-2025	10:16:44 AM	39	1276.50	CEUX
GENMAB A/S	02-Apr-2025	10:16:44 AM	24	1277.50	AQEU
GENMAB A/S	02-Apr-2025	10:18:51 AM	47	1277.50	CEUX

137

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	10:22:40 AM	22	1277.50	CEUX
GENMAB A/S	02-Apr-2025	10:23:12 AM	25	1278.50	TQEX
GENMAB A/S	02-Apr-2025	10:23:12 AM	83	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:23:12 AM	2	1278.50	CEUX
GENMAB A/S	02-Apr-2025	10:23:13 AM	26	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:23:13 AM	28	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:23:13 AM	30	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:23:13 AM	25	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:23:13 AM	12	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:23:21 AM	77	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:23:21 AM	7	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:23:21 AM	80	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:23:21 AM	23	1277.00	XCSE
GENMAB A/S	02-Apr-2025	10:23:21 AM	32	1277.50	TQEX
GENMAB A/S	02-Apr-2025	10:23:21 AM	60	1277.50	CEUX
GENMAB A/S	02-Apr-2025	10:23:22 AM	83	1276.00	XCSE
GENMAB A/S	02-Apr-2025	10:23:22 AM	30	1275.50	XCSE
GENMAB A/S	02-Apr-2025	10:23:22 AM	32	1276.00	TQEX
GENMAB A/S	02-Apr-2025	10:23:22 AM	46	1276.50	CEUX
GENMAB A/S	02-Apr-2025	10:23:22 AM	72	1275.00	CEUX
GENMAB A/S	02-Apr-2025	10:23:22 AM	23	1276.00	CEUX
GENMAB A/S	02-Apr-2025	10:23:22 AM	23	1276.00	AQEU
GENMAB A/S	02-Apr-2025	10:23:22 AM	27	1275.50	AQEU
GENMAB A/S	02-Apr-2025	10:26:19 AM	37	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:26:20 AM	2	1278.00	XCSE
GENMAB A/S	02-Apr-2025	10:27:17 AM	3	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:27:17 AM	78	1278.50	XCSE
GENMAB A/S	02-Apr-2025	10:27:17 AM	43	1279.00	XCSE
GENMAB A/S	02-Apr-2025	10:27:17 AM	13	1279.00	XCSE
GENMAB A/S	02-Apr-2025	10:27:17 AM	12	1279.00	XCSE
GENMAB A/S	02-Apr-2025	10:27:17 AM	41	1279.00	XCSE
GENMAB A/S	02-Apr-2025	10:27:17 AM	44	1279.00	XCSE
GENMAB A/S	02-Apr-2025	10:27:58 AM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:29:28 AM	22	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:29:28 AM	24	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:29:32 AM	35	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:29:59 AM	29	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:29:59 AM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:29:59 AM	47	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:29:59 AM	14	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:29:59 AM	6	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:29:59 AM	25	1279.50	AQEU
GENMAB A/S	02-Apr-2025	10:30:00 AM	46	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:30:00 AM	14	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:30:00 AM	11	1280.00	XCSE

138

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	10:30:00 AM	24	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:30:00 AM	14	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:30:03 AM	29	1279.00	XCSE
GENMAB A/S	02-Apr-2025	10:30:03 AM	57	1279.00	XCSE
GENMAB A/S	02-Apr-2025	10:30:03 AM	19	1279.00	CEUX
GENMAB A/S	02-Apr-2025	10:30:03 AM	49	1279.00	CEUX
GENMAB A/S	02-Apr-2025	10:32:24 AM	39	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:32:24 AM	30	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:32:24 AM	14	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:32:24 AM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:32:24 AM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:32:24 AM	34	1279.00	TQEX
GENMAB A/S	02-Apr-2025	10:35:02 AM	81	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:35:02 AM	45	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:35:02 AM	39	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:35:02 AM	25	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:35:02 AM	28	1280.00	TQEX
GENMAB A/S	02-Apr-2025	10:35:02 AM	82	1280.00	CEUX
GENMAB A/S	02-Apr-2025	10:35:02 AM	24	1280.00	AQEU
GENMAB A/S	02-Apr-2025	10:35:11 AM	2	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:35:11 AM	34	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:35:11 AM	30	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:35:11 AM	16	1280.00	XCSE
GENMAB A/S	02-Apr-2025	10:36:21 AM	38	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:39:03 AM	87	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:39:03 AM	12	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:39:03 AM	11	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:39:03 AM	13	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:39:03 AM	24	1281.00	TQEX
GENMAB A/S	02-Apr-2025	10:39:03 AM	18	1281.00	CEUX
GENMAB A/S	02-Apr-2025	10:39:03 AM	63	1281.00	CEUX
GENMAB A/S	02-Apr-2025	10:39:03 AM	21	1280.00	CEUX
GENMAB A/S	02-Apr-2025	10:39:03 AM	61	1280.00	CEUX
GENMAB A/S	02-Apr-2025	10:39:03 AM	23	1280.00	AQEU
GENMAB A/S	02-Apr-2025	10:39:04 AM	11	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:39:04 AM	39	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:39:04 AM	14	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:39:04 AM	13	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:39:04 AM	32	1280.50	XCSE
GENMAB A/S	02-Apr-2025	10:39:39 AM	12	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:39:39 AM	73	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:39:42 AM	10	1282.50	AQEU
GENMAB A/S	02-Apr-2025	10:43:01 AM	82	1284.50	XCSE
GENMAB A/S	02-Apr-2025	10:43:01 AM	60	1284.50	XCSE
GENMAB A/S	02-Apr-2025	10:43:01 AM	12	1284.50	XCSE

139

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	10:43:01 AM	23	1285.00	XCSE
GENMAB A/S	02-Apr-2025	10:43:01 AM	14	1285.00	XCSE
GENMAB A/S	02-Apr-2025	10:43:01 AM	22	1285.00	XCSE
GENMAB A/S	02-Apr-2025	10:43:01 AM	12	1285.00	XCSE
GENMAB A/S	02-Apr-2025	10:43:02 AM	28	1285.00	XCSE
GENMAB A/S	02-Apr-2025	10:43:10 AM	86	1284.50	XCSE
GENMAB A/S	02-Apr-2025	10:43:10 AM	20	1284.50	AQEU
GENMAB A/S	02-Apr-2025	10:43:10 AM	14	1284.50	AQEU
GENMAB A/S	02-Apr-2025	10:43:35 AM	23	1284.00	TQEX
GENMAB A/S	02-Apr-2025	10:43:35 AM	4	1284.00	CEUX
GENMAB A/S	02-Apr-2025	10:43:35 AM	79	1284.00	CEUX
GENMAB A/S	02-Apr-2025	10:44:00 AM	35	1283.50	XCSE
GENMAB A/S	02-Apr-2025	10:44:00 AM	6	1283.50	XCSE
GENMAB A/S	02-Apr-2025	10:44:00 AM	45	1283.50	XCSE
GENMAB A/S	02-Apr-2025	10:44:40 AM	20	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:45:08 AM	21	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:45:56 AM	23	1283.00	TQEX
GENMAB A/S	02-Apr-2025	10:45:56 AM	43	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:46:05 AM	37	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:46:05 AM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:46:16 AM	85	1282.50	XCSE
GENMAB A/S	02-Apr-2025	10:47:40 AM	43	1282.50	XCSE
GENMAB A/S	02-Apr-2025	10:47:41 AM	23	1282.50	TQEX
GENMAB A/S	02-Apr-2025	10:48:31 AM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:48:31 AM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:49:12 AM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:49:12 AM	59	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:49:12 AM	37	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:50:55 AM	83	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:50:55 AM	29	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:50:55 AM	51	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:51:01 AM	3	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:52:06 AM	22	1282.00	TQEX
GENMAB A/S	02-Apr-2025	10:52:06 AM	23	1282.00	TQEX
GENMAB A/S	02-Apr-2025	10:52:25 AM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:52:25 AM	11	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:52:25 AM	1	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:52:25 AM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:52:25 AM	32	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:52:26 AM	46	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:52:26 AM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:53:01 AM	32	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:53:02 AM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:56:45 AM	36	1281.50	CEUX
GENMAB A/S	02-Apr-2025	10:56:56 AM	25	1282.00	XCSE

140

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	10:56:56 AM	14	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:56:56 AM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:56:56 AM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:56:56 AM	36	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:56:56 AM	7	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:56:56 AM	7	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:59:06 AM	30	1282.50	TQEX
GENMAB A/S	02-Apr-2025	10:59:06 AM	4	1282.50	TQEX
GENMAB A/S	02-Apr-2025	10:59:10 AM	26	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:10 AM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:10 AM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:10 AM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:10 AM	39	1283.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:10 AM	7	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:59:10 AM	7	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:59:10 AM	6	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:59:10 AM	25	1283.00	CEUX
GENMAB A/S	02-Apr-2025	10:59:24 AM	83	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:24 AM	39	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:24 AM	18	1282.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:24 AM	80	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:24 AM	33	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:24 AM	25	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:24 AM	84	1282.00	CEUX
GENMAB A/S	02-Apr-2025	10:59:24 AM	81	1281.00	CEUX
GENMAB A/S	02-Apr-2025	10:59:24 AM	25	1282.00	AQEU
GENMAB A/S	02-Apr-2025	10:59:24 AM	27	1281.00	AQEU
GENMAB A/S	02-Apr-2025	10:59:25 AM	81	1281.00	XCSE
GENMAB A/S	02-Apr-2025	10:59:25 AM	23	1281.00	AQEU
GENMAB A/S	02-Apr-2025	10:59:26 AM	8	1279.50	XCSE
GENMAB A/S	02-Apr-2025	10:59:26 AM	83	1279.50	CEUX
GENMAB A/S	02-Apr-2025	10:59:27 AM	7	1279.50	XCSE
GENMAB A/S	02-Apr-2025	11:00:08 AM	87	1281.00	CEUX
GENMAB A/S	02-Apr-2025	11:00:08 AM	23	1281.00	AQEU
GENMAB A/S	02-Apr-2025	11:00:10 AM	86	1280.50	XCSE
GENMAB A/S	02-Apr-2025	11:00:10 AM	2	1280.00	CEUX
GENMAB A/S	02-Apr-2025	11:00:10 AM	65	1280.00	CEUX
GENMAB A/S	02-Apr-2025	11:00:10 AM	14	1280.00	CEUX
GENMAB A/S	02-Apr-2025	11:00:45 AM	71	1279.50	XCSE
GENMAB A/S	02-Apr-2025	11:01:41 AM	81	1278.50	XCSE
GENMAB A/S	02-Apr-2025	11:01:41 AM	73	1279.00	CEUX
GENMAB A/S	02-Apr-2025	11:01:41 AM	9	1279.00	CEUX
GENMAB A/S	02-Apr-2025	11:01:42 AM	63	1278.00	CEUX
GENMAB A/S	02-Apr-2025	11:02:59 AM	22	1277.00	CEUX
GENMAB A/S	02-Apr-2025	11:06:48 AM	84	1280.00	XCSE

141

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	11:06:48 AM	1	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:06:48 AM	13	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:06:48 AM	29	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:06:48 AM	23	1280.00	TQEX
GENMAB A/S	02-Apr-2025	11:06:48 AM	59	1280.00	CEUX
GENMAB A/S	02-Apr-2025	11:06:48 AM	18	1280.00	AQEU
GENMAB A/S	02-Apr-2025	11:06:48 AM	5	1280.00	AQEU
GENMAB A/S	02-Apr-2025	11:08:04 AM	62	1280.50	XCSE
GENMAB A/S	02-Apr-2025	11:08:04 AM	15	1280.50	XCSE
GENMAB A/S	02-Apr-2025	11:08:04 AM	32	1280.50	XCSE
GENMAB A/S	02-Apr-2025	11:08:05 AM	14	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:08:05 AM	43	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:08:05 AM	23	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:08:05 AM	12	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:10:58 AM	20	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:11:35 AM	87	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:11:35 AM	43	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:11:35 AM	9	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:11:35 AM	3	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:11:35 AM	26	1281.50	TQEX
GENMAB A/S	02-Apr-2025	11:11:44 AM	10	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:11:47 AM	3	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:11:55 AM	13	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:11:56 AM	11	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:11:59 AM	14	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:11:59 AM	12	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	12	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	12	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	43	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	14	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	13	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	11	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	2	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	10	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	87	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:12:03 AM	83	1282.00	CEUX
GENMAB A/S	02-Apr-2025	11:12:23 AM	1	1281.50	TQEX
GENMAB A/S	02-Apr-2025	11:12:23 AM	22	1281.50	TQEX
GENMAB A/S	02-Apr-2025	11:12:29 AM	6	1281.00	XCSE
GENMAB A/S	02-Apr-2025	11:12:48 AM	78	1281.00	XCSE
GENMAB A/S	02-Apr-2025	11:12:48 AM	84	1281.00	CEUX
GENMAB A/S	02-Apr-2025	11:13:02 AM	24	1280.50	TQEX
GENMAB A/S	02-Apr-2025	11:13:06 AM	83	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:13:06 AM	76	1280.00	CEUX
GENMAB A/S	02-Apr-2025	11:13:45 AM	86	1279.00	XCSE

142

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	11:13:55 AM	4	1279.00	AQEU
GENMAB A/S	02-Apr-2025	11:15:00 AM	37	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:15:00 AM	50	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:15:14 AM	18	1279.50	CEUX
GENMAB A/S	02-Apr-2025	11:17:10 AM	83	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:17:10 AM	23	1280.00	TQEX
GENMAB A/S	02-Apr-2025	11:17:10 AM	25	1280.00	AQEU
GENMAB A/S	02-Apr-2025	11:17:11 AM	7	1279.50	CEUX
GENMAB A/S	02-Apr-2025	11:17:37 AM	72	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:19:13 AM	70	1278.50	CEUX
GENMAB A/S	02-Apr-2025	11:19:24 AM	12	1278.00	AQEU
GENMAB A/S	02-Apr-2025	11:20:53 AM	18	1278.00	AQEU
GENMAB A/S	02-Apr-2025	11:20:56 AM	3	1278.00	AQEU
GENMAB A/S	02-Apr-2025	11:22:34 AM	44	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:22:34 AM	44	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:22:34 AM	28	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:22:34 AM	13	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:22:51 AM	12	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:22:51 AM	3	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:22:51 AM	8	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:24:40 AM	40	1279.00	XCSE
GENMAB A/S	02-Apr-2025	11:26:00 AM	35	1278.50	XCSE
GENMAB A/S	02-Apr-2025	11:26:02 AM	62	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:26:33 AM	82	1279.50	XCSE
GENMAB A/S	02-Apr-2025	11:26:33 AM	30	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:26:33 AM	30	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:26:33 AM	43	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:26:33 AM	6	1280.00	XCSE
GENMAB A/S	02-Apr-2025	11:26:33 AM	26	1279.50	TQEX
GENMAB A/S	02-Apr-2025	11:26:33 AM	82	1279.50	CEUX
GENMAB A/S	02-Apr-2025	11:26:33 AM	32	1279.50	CEUX
GENMAB A/S	02-Apr-2025	11:27:53 AM	33	1278.50	XCSE
GENMAB A/S	02-Apr-2025	11:27:58 AM	13	1278.50	XCSE
GENMAB A/S	02-Apr-2025	11:27:58 AM	44	1278.50	TQEX
GENMAB A/S	02-Apr-2025	11:27:58 AM	50	1278.50	CEUX
GENMAB A/S	02-Apr-2025	11:27:58 AM	32	1278.50	CEUX
GENMAB A/S	02-Apr-2025	11:28:37 AM	3	1278.00	AQEU
GENMAB A/S	02-Apr-2025	11:28:51 AM	44	1278.50	XCSE
GENMAB A/S	02-Apr-2025	11:28:51 AM	43	1278.50	XCSE
GENMAB A/S	02-Apr-2025	11:29:28 AM	23	1279.00	AQEU
GENMAB A/S	02-Apr-2025	11:32:36 AM	12	1281.00	CEUX
GENMAB A/S	02-Apr-2025	11:32:36 AM	1	1281.00	CEUX
GENMAB A/S	02-Apr-2025	11:33:51 AM	81	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:33:51 AM	81	1281.50	XCSE
GENMAB A/S	02-Apr-2025	11:33:51 AM	29	1282.00	TQEX

143

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	11:33:51 AM	84	1282.50	CEUX
GENMAB A/S	02-Apr-2025	11:33:51 AM	36	1283.00	CEUX
GENMAB A/S	02-Apr-2025	11:34:15 AM	18	1282.50	CEUX
GENMAB A/S	02-Apr-2025	11:34:15 AM	65	1282.50	CEUX
GENMAB A/S	02-Apr-2025	11:34:41 AM	83	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:35:40 AM	43	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:35:40 AM	5	1282.00	XCSE
GENMAB A/S	02-Apr-2025	11:35:40 AM	85	1281.50	CEUX
GENMAB A/S	02-Apr-2025	11:36:26 AM	44	1282.50	XCSE
GENMAB A/S	02-Apr-2025	11:36:26 AM	8	1282.00	CEUX
GENMAB A/S	02-Apr-2025	11:41:53 AM	18	1283.00	CEUX
GENMAB A/S	02-Apr-2025	11:41:53 AM	68	1283.00	CEUX
GENMAB A/S	02-Apr-2025	11:42:21 AM	31	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:21 AM	15	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:21 AM	43	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:22 AM	12	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:22 AM	43	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:22 AM	14	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:22 AM	37	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:22 AM	21	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:22 AM	12	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:50 AM	48	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:42:50 AM	48	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:43:22 AM	29	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:43:22 AM	15	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:43:23 AM	29	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:43:23 AM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:43:54 AM	43	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:43:54 AM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:43:54 AM	40	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:44:01 AM	23	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:44:31 AM	21	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:44:31 AM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:44:31 AM	12	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:44:31 AM	19	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:45:41 AM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:45:41 AM	37	1283.00	XCSE
GENMAB A/S	02-Apr-2025	11:46:07 AM	36	1283.00	CEUX
GENMAB A/S	02-Apr-2025	11:46:07 AM	23	1283.00	CEUX
GENMAB A/S	02-Apr-2025	11:46:12 AM	85	1284.00	CEUX
GENMAB A/S	02-Apr-2025	11:48:41 AM	25	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:48:41 AM	30	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:50:31 AM	1	1285.00	XCSE
GENMAB A/S	02-Apr-2025	11:50:31 AM	2	1285.00	XCSE
GENMAB A/S	02-Apr-2025	11:50:31 AM	84	1285.00	CEUX

144

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	11:50:34 AM	25	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:50:34 AM	22	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:50:38 AM	25	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:50:41 AM	25	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:50:41 AM	3	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:51:01 AM	31	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:51:02 AM	31	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:51:02 AM	31	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:51:03 AM	27	1285.50	XCSE
GENMAB A/S	02-Apr-2025	11:51:03 AM	82	1285.00	CEUX
GENMAB A/S	02-Apr-2025	11:51:21 AM	38	1285.00	XCSE
GENMAB A/S	02-Apr-2025	11:52:00 AM	29	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:52:00 AM	51	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:52:00 AM	42	1284.50	TQEX
GENMAB A/S	02-Apr-2025	11:55:51 AM	21	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:55:51 AM	37	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:55:51 AM	12	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:55:51 AM	30	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:55:52 AM	1	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:55:58 AM	14	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:55:58 AM	3	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:55:58 AM	37	1284.50	XCSE
GENMAB A/S	02-Apr-2025	11:56:00 AM	1	1284.00	CEUX
GENMAB A/S	02-Apr-2025	11:56:00 AM	82	1284.00	CEUX
GENMAB A/S	02-Apr-2025	11:56:27 AM	12	1284.00	XCSE
GENMAB A/S	02-Apr-2025	11:56:28 AM	84	1283.50	XCSE
GENMAB A/S	02-Apr-2025	11:56:28 AM	34	1283.50	TQEX
GENMAB A/S	02-Apr-2025	11:56:31 AM	1	1283.00	CEUX
GENMAB A/S	02-Apr-2025	11:56:31 AM	79	1283.00	CEUX
GENMAB A/S	02-Apr-2025	11:59:57 AM	25	1283.50	TQEX
GENMAB A/S	02-Apr-2025	12:02:04 PM	82	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:02:04 PM	41	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:02:04 PM	43	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:02:06 PM	25	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:02:06 PM	20	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:02:06 PM	85	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:02:06 PM	29	1282.50	TQEX
GENMAB A/S	02-Apr-2025	12:02:06 PM	80	1282.50	CEUX
GENMAB A/S	02-Apr-2025	12:02:18 PM	80	1281.50	XCSE
GENMAB A/S	02-Apr-2025	12:02:27 PM	26	1281.50	AQEU
GENMAB A/S	02-Apr-2025	12:02:27 PM	85	1281.50	CEUX
GENMAB A/S	02-Apr-2025	12:03:23 PM	86	1281.50	XCSE
GENMAB A/S	02-Apr-2025	12:03:23 PM	26	1281.50	AQEU
GENMAB A/S	02-Apr-2025	12:03:23 PM	51	1281.50	CEUX
GENMAB A/S	02-Apr-2025	12:03:23 PM	14	1281.50	CEUX

145

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	12:04:38 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	12:04:38 PM	4	1282.00	XCSE
GENMAB A/S	02-Apr-2025	12:04:38 PM	7	1282.00	XCSE
GENMAB A/S	02-Apr-2025	12:04:51 PM	46	1282.00	XCSE
GENMAB A/S	02-Apr-2025	12:04:51 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	12:04:51 PM	5	1282.00	XCSE
GENMAB A/S	02-Apr-2025	12:05:26 PM	23	1282.50	AQEU
GENMAB A/S	02-Apr-2025	12:05:26 PM	8	1282.00	CEUX
GENMAB A/S	02-Apr-2025	12:05:27 PM	2	1282.50	AQEU
GENMAB A/S	02-Apr-2025	12:08:45 PM	49	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:19 PM	13	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:20 PM	11	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:20 PM	22	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:21 PM	13	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:22 PM	11	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:22 PM	25	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:23 PM	1	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:25 PM	14	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:09:33 PM	8	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:10:25 PM	72	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:10:25 PM	24	1283.00	TQEX
GENMAB A/S	02-Apr-2025	12:10:25 PM	87	1283.00	CEUX
GENMAB A/S	02-Apr-2025	12:10:31 PM	11	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:10:31 PM	24	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:10:31 PM	12	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:10:31 PM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:10:31 PM	16	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:11:54 PM	40	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:12:11 PM	25	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:12:41 PM	19	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:12:41 PM	8	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:13:11 PM	13	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:13:11 PM	1	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:13:11 PM	43	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:14:54 PM	21	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:14:54 PM	2	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:14:55 PM	43	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:14:55 PM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:15:59 PM	29	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:20:08 PM	52	1285.00	CEUX
GENMAB A/S	02-Apr-2025	12:20:08 PM	1	1285.00	CEUX
GENMAB A/S	02-Apr-2025	12:20:08 PM	1	1285.00	CEUX
GENMAB A/S	02-Apr-2025	12:20:11 PM	82	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:11 PM	5	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:12 PM	24	1284.50	XCSE

146

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	12:20:12 PM	13	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:27 PM	2	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:27 PM	25	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:40 PM	11	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:40 PM	12	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:40 PM	14	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:41 PM	12	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:41 PM	13	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:42 PM	12	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:42 PM	12	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:20:45 PM	11	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:21:03 PM	13	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:21:03 PM	2	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:21:06 PM	11	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:21:21 PM	54	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:21:27 PM	2	1284.50	CEUX
GENMAB A/S	02-Apr-2025	12:21:27 PM	21	1284.50	CEUX
GENMAB A/S	02-Apr-2025	12:22:12 PM	7	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:22:50 PM	23	1284.50	CEUX
GENMAB A/S	02-Apr-2025	12:22:51 PM	25	1284.50	AQEU
GENMAB A/S	02-Apr-2025	12:23:27 PM	32	1284.50	CEUX
GENMAB A/S	02-Apr-2025	12:25:28 PM	2	1284.50	CEUX
GENMAB A/S	02-Apr-2025	12:25:56 PM	22	1285.00	TQEX
GENMAB A/S	02-Apr-2025	12:26:00 PM	86	1285.00	XCSE
GENMAB A/S	02-Apr-2025	12:26:00 PM	33	1285.00	TQEX
GENMAB A/S	02-Apr-2025	12:26:00 PM	36	1285.00	CEUX
GENMAB A/S	02-Apr-2025	12:27:41 PM	53	1285.50	XCSE
GENMAB A/S	02-Apr-2025	12:27:41 PM	14	1285.50	XCSE
GENMAB A/S	02-Apr-2025	12:27:41 PM	13	1285.50	XCSE
GENMAB A/S	02-Apr-2025	12:28:02 PM	1	1285.50	XCSE
GENMAB A/S	02-Apr-2025	12:28:07 PM	31	1284.00	TQEX
GENMAB A/S	02-Apr-2025	12:28:07 PM	87	1285.00	CEUX
GENMAB A/S	02-Apr-2025	12:28:07 PM	53	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:28:08 PM	4	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:28:38 PM	26	1284.00	TQEX
GENMAB A/S	02-Apr-2025	12:29:30 PM	86	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:29:55 PM	2	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:29:55 PM	43	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:32:25 PM	4	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:32:27 PM	79	1284.50	XCSE
GENMAB A/S	02-Apr-2025	12:32:27 PM	82	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:32:27 PM	25	1284.00	TQEX
GENMAB A/S	02-Apr-2025	12:32:27 PM	82	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:33:01 PM	20	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:33:01 PM	43	1283.50	XCSE

147

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	12:33:03 PM	34	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:33:03 PM	13	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:33:04 PM	30	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:33:25 PM	35	1283.00	TQEX
GENMAB A/S	02-Apr-2025	12:33:25 PM	85	1283.00	CEUX
GENMAB A/S	02-Apr-2025	12:33:48 PM	25	1283.00	AQEU
GENMAB A/S	02-Apr-2025	12:35:22 PM	37	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:35:22 PM	1	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:35:22 PM	43	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:35:22 PM	39	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:35:41 PM	5	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:35:41 PM	48	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:35:41 PM	18	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:36:09 PM	83	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:37:47 PM	2	1282.50	CEUX
GENMAB A/S	02-Apr-2025	12:37:47 PM	23	1282.50	CEUX
GENMAB A/S	02-Apr-2025	12:37:47 PM	33	1282.50	CEUX
GENMAB A/S	02-Apr-2025	12:40:07 PM	34	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:40:21 PM	30	1283.50	TQEX
GENMAB A/S	02-Apr-2025	12:40:27 PM	10	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:41:38 PM	23	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:41:38 PM	57	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:41:38 PM	6	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:41:38 PM	23	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:41:38 PM	7	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:41:39 PM	11	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:41:39 PM	43	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:41:39 PM	12	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:42:11 PM	2	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:42:11 PM	30	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:42:11 PM	13	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:42:11 PM	32	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:42:37 PM	4	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:42:37 PM	9	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:42:37 PM	29	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:42:37 PM	7	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:43:01 PM	25	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:43:49 PM	13	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:44:37 PM	1	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:44:37 PM	4	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:44:37 PM	11	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:47:26 PM	3	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:48:26 PM	4	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:49:26 PM	5	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:50:01 PM	54	1283.00	XCSE

148

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	12:50:33 PM	3	1283.00	CEUX
GENMAB A/S	02-Apr-2025	12:51:26 PM	4	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:51:28 PM	11	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:30 PM	27	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:30 PM	27	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:30 PM	36	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:51:30 PM	8	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:51:31 PM	27	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:33 PM	36	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:51:34 PM	36	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:51:45 PM	36	1284.00	CEUX
GENMAB A/S	02-Apr-2025	12:51:49 PM	22	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	21	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	37	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	27	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	2	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	9	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	14	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	43	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	37	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:49 PM	6	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:50 PM	5	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:50 PM	12	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:50 PM	14	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:51:50 PM	27	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:52:11 PM	13	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:52:11 PM	43	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:52:11 PM	33	1284.00	XCSE
GENMAB A/S	02-Apr-2025	12:53:26 PM	4	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:53:26 PM	36	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:53:27 PM	23	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:53:47 PM	1	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:54:24 PM	1	1283.50	XCSE
GENMAB A/S	02-Apr-2025	12:54:24 PM	26	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:54:24 PM	3	1283.00	AQEU
GENMAB A/S	02-Apr-2025	12:54:24 PM	32	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:54:57 PM	3	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:54:57 PM	20	1283.50	CEUX
GENMAB A/S	02-Apr-2025	12:55:07 PM	25	1283.00	TQEX
GENMAB A/S	02-Apr-2025	12:55:07 PM	20	1283.00	AQEU
GENMAB A/S	02-Apr-2025	12:55:07 PM	83	1283.00	CEUX
GENMAB A/S	02-Apr-2025	12:55:09 PM	12	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:55:09 PM	11	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:55:09 PM	37	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:55:09 PM	2	1283.00	XCSE

149

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	12:55:09 PM	34	1283.00	XCSE
GENMAB A/S	02-Apr-2025	12:55:41 PM	12	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:55:51 PM	3	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:55:51 PM	13	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:56:05 PM	84	1282.00	XCSE
GENMAB A/S	02-Apr-2025	12:56:05 PM	26	1282.00	TQEX
GENMAB A/S	02-Apr-2025	12:56:05 PM	81	1282.00	CEUX
GENMAB A/S	02-Apr-2025	12:56:50 PM	84	1282.50	XCSE
GENMAB A/S	02-Apr-2025	12:56:50 PM	32	1282.50	TQEX
GENMAB A/S	02-Apr-2025	12:56:50 PM	83	1282.50	CEUX
GENMAB A/S	02-Apr-2025	12:56:51 PM	3	1281.50	CEUX
GENMAB A/S	02-Apr-2025	12:56:51 PM	81	1281.50	CEUX
GENMAB A/S	02-Apr-2025	12:58:58 PM	9	1281.00	XCSE
GENMAB A/S	02-Apr-2025	12:58:58 PM	71	1281.00	XCSE
GENMAB A/S	02-Apr-2025	12:59:01 PM	80	1280.50	CEUX
GENMAB A/S	02-Apr-2025	12:59:47 PM	83	1279.50	XCSE
GENMAB A/S	02-Apr-2025	13:02:05 PM	40	1280.50	XCSE
GENMAB A/S	02-Apr-2025	13:02:56 PM	23	1280.00	AQEU
GENMAB A/S	02-Apr-2025	13:02:57 PM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	13:02:57 PM	12	1280.00	XCSE
GENMAB A/S	02-Apr-2025	13:02:57 PM	1	1280.00	XCSE
GENMAB A/S	02-Apr-2025	13:02:57 PM	12	1280.00	XCSE
GENMAB A/S	02-Apr-2025	13:02:58 PM	83	1279.50	XCSE
GENMAB A/S	02-Apr-2025	13:02:58 PM	26	1279.50	TQEX
GENMAB A/S	02-Apr-2025	13:02:58 PM	75	1279.00	CEUX
GENMAB A/S	02-Apr-2025	13:07:35 PM	14	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:07:39 PM	16	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:07:40 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:07:41 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:07:41 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:07:44 PM	14	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:07:44 PM	11	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:07:44 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	48	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	33	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	43	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	37	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	3	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:05 PM	82	1283.00	CEUX
GENMAB A/S	02-Apr-2025	13:13:06 PM	14	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:07 PM	13	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:13:26 PM	8	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:15:00 PM	109	1283.00	XCSE

150

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	13:15:00 PM	26	1282.50	TQEX
GENMAB A/S	02-Apr-2025	13:15:04 PM	80	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:15:05 PM	12	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:15:23 PM	25	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:15:23 PM	43	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:15:23 PM	23	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:15:23 PM	82	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:15:23 PM	32	1282.50	TQEX
GENMAB A/S	02-Apr-2025	13:15:23 PM	24	1281.50	TQEX
GENMAB A/S	02-Apr-2025	13:15:23 PM	87	1282.00	CEUX
GENMAB A/S	02-Apr-2025	13:16:50 PM	67	1281.00	XCSE
GENMAB A/S	02-Apr-2025	13:17:34 PM	15	1281.00	XCSE
GENMAB A/S	02-Apr-2025	13:18:25 PM	9	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:18:58 PM	16	1282.50	XCSE
GENMAB A/S	02-Apr-2025	13:19:02 PM	38	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:19:02 PM	20	1282.50	CEUX
GENMAB A/S	02-Apr-2025	13:19:03 PM	60	1282.50	CEUX
GENMAB A/S	02-Apr-2025	13:19:18 PM	87	1281.50	XCSE
GENMAB A/S	02-Apr-2025	13:19:18 PM	82	1281.50	CEUX
GENMAB A/S	02-Apr-2025	13:19:41 PM	78	1280.50	CEUX
GENMAB A/S	02-Apr-2025	13:19:41 PM	5	1280.50	CEUX
GENMAB A/S	02-Apr-2025	13:19:58 PM	20	1280.00	XCSE
GENMAB A/S	02-Apr-2025	13:19:58 PM	67	1280.00	XCSE
GENMAB A/S	02-Apr-2025	13:19:58 PM	28	1280.00	TQEX
GENMAB A/S	02-Apr-2025	13:20:34 PM	81	1280.50	XCSE
GENMAB A/S	02-Apr-2025	13:22:03 PM	43	1280.00	CEUX
GENMAB A/S	02-Apr-2025	13:22:03 PM	18	1280.00	CEUX
GENMAB A/S	02-Apr-2025	13:22:05 PM	85	1279.50	XCSE
GENMAB A/S	02-Apr-2025	13:23:34 PM	21	1279.50	TQEX
GENMAB A/S	02-Apr-2025	13:26:00 PM	47	1279.50	XCSE
GENMAB A/S	02-Apr-2025	13:26:38 PM	31	1279.00	CEUX
GENMAB A/S	02-Apr-2025	13:26:38 PM	52	1279.00	CEUX
GENMAB A/S	02-Apr-2025	13:26:40 PM	30	1279.00	AQEU
GENMAB A/S	02-Apr-2025	13:27:10 PM	33	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:27:10 PM	48	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:27:10 PM	26	1279.00	XCSE
GENMAB A/S	02-Apr-2025	13:27:10 PM	12	1279.00	AQEU
GENMAB A/S	02-Apr-2025	13:29:21 PM	42	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:29:21 PM	54	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:29:21 PM	24	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:29:21 PM	5	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:29:22 PM	23	1277.50	AQEU
GENMAB A/S	02-Apr-2025	13:29:22 PM	43	1277.50	CEUX
GENMAB A/S	02-Apr-2025	13:29:22 PM	11	1277.50	CEUX
GENMAB A/S	02-Apr-2025	13:29:25 PM	21	1277.50	TQEX

151

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	13:29:25 PM	13	1277.50	CEUX
GENMAB A/S	02-Apr-2025	13:29:25 PM	17	1277.50	CEUX
GENMAB A/S	02-Apr-2025	13:29:30 PM	27	1277.00	XCSE
GENMAB A/S	02-Apr-2025	13:29:30 PM	54	1277.00	XCSE
GENMAB A/S	02-Apr-2025	13:30:07 PM	39	1276.50	CEUX
GENMAB A/S	02-Apr-2025	13:30:07 PM	9	1276.50	CEUX
GENMAB A/S	02-Apr-2025	13:30:26 PM	50	1276.00	XCSE
GENMAB A/S	02-Apr-2025	13:30:26 PM	36	1276.00	XCSE
GENMAB A/S	02-Apr-2025	13:34:25 PM	5	1275.50	AQEU
GENMAB A/S	02-Apr-2025	13:34:36 PM	18	1275.50	AQEU
GENMAB A/S	02-Apr-2025	13:34:36 PM	11	1275.00	CEUX
GENMAB A/S	02-Apr-2025	13:34:36 PM	73	1275.00	CEUX
GENMAB A/S	02-Apr-2025	13:35:27 PM	21	1275.00	XCSE
GENMAB A/S	02-Apr-2025	13:35:27 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	13:35:27 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	13:36:38 PM	85	1276.50	XCSE
GENMAB A/S	02-Apr-2025	13:36:38 PM	28	1276.50	TQEX
GENMAB A/S	02-Apr-2025	13:36:38 PM	84	1277.00	CEUX
GENMAB A/S	02-Apr-2025	13:36:38 PM	43	1276.00	CEUX
GENMAB A/S	02-Apr-2025	13:36:38 PM	37	1276.00	CEUX
GENMAB A/S	02-Apr-2025	13:38:27 PM	5	1276.50	XCSE
GENMAB A/S	02-Apr-2025	13:39:23 PM	3	1276.50	XCSE
GENMAB A/S	02-Apr-2025	13:40:58 PM	27	1278.00	CEUX
GENMAB A/S	02-Apr-2025	13:40:58 PM	47	1278.00	CEUX
GENMAB A/S	02-Apr-2025	13:41:08 PM	84	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:41:19 PM	30	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:41:19 PM	12	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:41:19 PM	37	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:41:19 PM	13	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:41:19 PM	11	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:41:19 PM	6	1278.00	XCSE
GENMAB A/S	02-Apr-2025	13:41:19 PM	17	1277.50	TQEX
GENMAB A/S	02-Apr-2025	13:41:19 PM	6	1277.50	TQEX
GENMAB A/S	02-Apr-2025	13:41:26 PM	6	1277.50	XCSE
GENMAB A/S	02-Apr-2025	13:43:56 PM	40	1278.00	CEUX
GENMAB A/S	02-Apr-2025	13:43:57 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:43:57 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:43:57 PM	12	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:43:59 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:00 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:00 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:05 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:12 PM	40	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:13 PM	13	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:13 PM	13	1278.50	XCSE

152

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	13:44:13 PM	12	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:23 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:41 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:41 PM	31	1278.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:42 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	13:44:42 PM	25	1278.00	TQEX
GENMAB A/S	02-Apr-2025	13:44:42 PM	24	1278.00	AQEU
GENMAB A/S	02-Apr-2025	13:44:42 PM	28	1278.00	CEUX
GENMAB A/S	02-Apr-2025	13:45:18 PM	39	1280.50	CEUX
GENMAB A/S	02-Apr-2025	13:45:18 PM	24	1280.50	CEUX
GENMAB A/S	02-Apr-2025	13:45:50 PM	84	1280.00	XCSE
GENMAB A/S	02-Apr-2025	13:48:18 PM	42	1281.00	XCSE
GENMAB A/S	02-Apr-2025	13:48:33 PM	35	1281.50	CEUX
GENMAB A/S	02-Apr-2025	13:49:41 PM	38	1281.00	XCSE
GENMAB A/S	02-Apr-2025	13:50:30 PM	44	1281.50	TQEX
GENMAB A/S	02-Apr-2025	13:50:30 PM	30	1281.50	CEUX
GENMAB A/S	02-Apr-2025	13:50:30 PM	18	1281.50	CEUX
GENMAB A/S	02-Apr-2025	13:52:24 PM	29	1281.00	AQEU
GENMAB A/S	02-Apr-2025	13:52:30 PM	46	1281.50	XCSE
GENMAB A/S	02-Apr-2025	13:52:30 PM	13	1281.50	XCSE
GENMAB A/S	02-Apr-2025	13:52:30 PM	11	1281.50	XCSE
GENMAB A/S	02-Apr-2025	13:52:30 PM	14	1281.50	XCSE
GENMAB A/S	02-Apr-2025	13:52:30 PM	25	1281.50	XCSE
GENMAB A/S	02-Apr-2025	13:52:47 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:47 PM	37	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:47 PM	14	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:47 PM	14	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:47 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:47 PM	20	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:48 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:48 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:48 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:48 PM	37	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:52:48 PM	30	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:53:26 PM	12	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:53:26 PM	15	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:53:27 PM	2	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:53:27 PM	15	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:53:51 PM	11	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:53:51 PM	9	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:54:32 PM	1	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:54:33 PM	82	1282.00	XCSE
GENMAB A/S	02-Apr-2025	13:54:34 PM	80	1285.50	XCSE
GENMAB A/S	02-Apr-2025	13:54:34 PM	84	1286.00	CEUX
GENMAB A/S	02-Apr-2025	13:54:35 PM	42	1285.00	TQEX

153

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	13:54:39 PM	36	1285.00	AQEU
GENMAB A/S	02-Apr-2025	13:54:39 PM	19	1284.50	CEUX
GENMAB A/S	02-Apr-2025	13:54:39 PM	5	1284.50	CEUX
GENMAB A/S	02-Apr-2025	13:55:10 PM	80	1284.00	XCSE
GENMAB A/S	02-Apr-2025	13:55:10 PM	39	1284.00	AQEU
GENMAB A/S	02-Apr-2025	13:55:10 PM	59	1284.50	CEUX
GENMAB A/S	02-Apr-2025	13:55:10 PM	86	1283.50	CEUX
GENMAB A/S	02-Apr-2025	13:55:35 PM	83	1283.00	XCSE
GENMAB A/S	02-Apr-2025	13:55:35 PM	18	1283.00	AQEU
GENMAB A/S	02-Apr-2025	13:55:35 PM	17	1283.00	AQEU
GENMAB A/S	02-Apr-2025	13:55:42 PM	80	1281.50	XCSE
GENMAB A/S	02-Apr-2025	13:55:42 PM	86	1282.50	CEUX
GENMAB A/S	02-Apr-2025	13:58:25 PM	10	1281.50	AQEU
GENMAB A/S	02-Apr-2025	13:59:26 PM	6	1281.50	AQEU
GENMAB A/S	02-Apr-2025	13:59:26 PM	2	1281.50	AQEU
GENMAB A/S	02-Apr-2025	13:59:27 PM	3	1281.50	AQEU
GENMAB A/S	02-Apr-2025	13:59:46 PM	1	1281.50	AQEU
GENMAB A/S	02-Apr-2025	14:00:26 PM	65	1282.00	XCSE
GENMAB A/S	02-Apr-2025	14:00:26 PM	21	1282.00	XCSE
GENMAB A/S	02-Apr-2025	14:00:34 PM	1	1282.00	XCSE
GENMAB A/S	02-Apr-2025	14:01:27 PM	5	1281.50	XCSE
GENMAB A/S	02-Apr-2025	14:01:27 PM	8	1281.50	XCSE
GENMAB A/S	02-Apr-2025	14:01:27 PM	24	1281.50	TQEX
GENMAB A/S	02-Apr-2025	14:01:27 PM	3	1281.50	AQEU
GENMAB A/S	02-Apr-2025	14:02:02 PM	62	1281.50	XCSE
GENMAB A/S	02-Apr-2025	14:02:02 PM	19	1281.50	XCSE
GENMAB A/S	02-Apr-2025	14:02:26 PM	7	1281.50	XCSE
GENMAB A/S	02-Apr-2025	14:03:09 PM	23	1281.00	CEUX
GENMAB A/S	02-Apr-2025	14:03:12 PM	84	1280.50	XCSE
GENMAB A/S	02-Apr-2025	14:03:12 PM	12	1281.00	XCSE
GENMAB A/S	02-Apr-2025	14:03:12 PM	39	1281.00	XCSE
GENMAB A/S	02-Apr-2025	14:03:12 PM	14	1281.00	XCSE
GENMAB A/S	02-Apr-2025	14:03:12 PM	9	1281.00	XCSE
GENMAB A/S	02-Apr-2025	14:03:23 PM	12	1280.00	TQEX
GENMAB A/S	02-Apr-2025	14:03:25 PM	10	1280.00	AQEU
GENMAB A/S	02-Apr-2025	14:03:25 PM	20	1280.00	AQEU
GENMAB A/S	02-Apr-2025	14:03:27 PM	28	1279.50	CEUX
GENMAB A/S	02-Apr-2025	14:03:29 PM	82	1279.00	XCSE
GENMAB A/S	02-Apr-2025	14:05:27 PM	8	1278.50	AQEU
GENMAB A/S	02-Apr-2025	14:05:37 PM	18	1278.50	AQEU
GENMAB A/S	02-Apr-2025	14:07:26 PM	25	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:07:26 PM	10	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:07:26 PM	21	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:07:26 PM	22	1278.50	TQEX
GENMAB A/S	02-Apr-2025	14:07:27 PM	81	1278.50	XCSE

154

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	14:07:27 PM	1	1278.50	AQEU
GENMAB A/S	02-Apr-2025	14:07:31 PM	36	1278.50	AQEU
GENMAB A/S	02-Apr-2025	14:08:05 PM	24	1278.00	CEUX
GENMAB A/S	02-Apr-2025	14:08:26 PM	19	1278.00	CEUX
GENMAB A/S	02-Apr-2025	14:08:49 PM	33	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:08:49 PM	7	1278.50	CEUX
GENMAB A/S	02-Apr-2025	14:08:49 PM	2	1278.50	CEUX
GENMAB A/S	02-Apr-2025	14:08:52 PM	46	1278.50	CEUX
GENMAB A/S	02-Apr-2025	14:08:52 PM	25	1278.50	CEUX
GENMAB A/S	02-Apr-2025	14:08:57 PM	52	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:00 PM	35	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:00 PM	26	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:04 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:04 PM	12	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:04 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:04 PM	5	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:04 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:04 PM	12	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:04 PM	35	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:16 PM	17	1278.00	AQEU
GENMAB A/S	02-Apr-2025	14:09:16 PM	13	1278.00	AQEU
GENMAB A/S	02-Apr-2025	14:09:21 PM	44	1278.00	XCSE
GENMAB A/S	02-Apr-2025	14:09:21 PM	11	1278.00	XCSE
GENMAB A/S	02-Apr-2025	14:09:21 PM	8	1278.00	XCSE
GENMAB A/S	02-Apr-2025	14:09:34 PM	81	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:09:34 PM	52	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:09:34 PM	31	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:10:00 PM	27	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:10:00 PM	51	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:10:02 PM	2	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:10:23 PM	4	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:11:31 PM	18	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:11:31 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:12:08 PM	27	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:12:51 PM	47	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:12:51 PM	5	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:13:08 PM	1	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:13:17 PM	30	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:13:17 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:13:18 PM	51	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:14:25 PM	15	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:14:41 PM	71	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:14:41 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:14:41 PM	65	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:16:10 PM	80	1278.50	XCSE

155

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	14:16:27 PM	42	1279.00	XCSE
GENMAB A/S	02-Apr-2025	14:16:27 PM	14	1279.00	XCSE
GENMAB A/S	02-Apr-2025	14:16:27 PM	11	1279.00	XCSE
GENMAB A/S	02-Apr-2025	14:16:33 PM	46	1279.00	XCSE
GENMAB A/S	02-Apr-2025	14:16:56 PM	23	1279.00	AQEU
GENMAB A/S	02-Apr-2025	14:17:18 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:17:18 PM	6	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:17:18 PM	38	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:17:26 PM	32	1279.00	CEUX
GENMAB A/S	02-Apr-2025	14:18:01 PM	1	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:18:01 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:18:01 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:18:01 PM	34	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:18:01 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	14:18:01 PM	32	1279.00	CEUX
GENMAB A/S	02-Apr-2025	14:18:25 PM	80	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:18:25 PM	82	1278.50	CEUX
GENMAB A/S	02-Apr-2025	14:21:00 PM	39	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:21:00 PM	9	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:21:00 PM	37	1278.50	XCSE
GENMAB A/S	02-Apr-2025	14:21:00 PM	30	1278.00	TQEX
GENMAB A/S	02-Apr-2025	14:21:00 PM	20	1278.00	AQEU
GENMAB A/S	02-Apr-2025	14:21:00 PM	7	1278.00	AQEU
GENMAB A/S	02-Apr-2025	14:21:00 PM	23	1278.00	CEUX
GENMAB A/S	02-Apr-2025	14:21:05 PM	39	1278.00	TQEX
GENMAB A/S	02-Apr-2025	14:21:22 PM	24	1278.00	AQEU
GENMAB A/S	02-Apr-2025	14:21:26 PM	9	1278.00	CEUX
GENMAB A/S	02-Apr-2025	14:21:34 PM	25	1278.00	XCSE
GENMAB A/S	02-Apr-2025	14:21:34 PM	84	1277.50	XCSE
GENMAB A/S	02-Apr-2025	14:21:54 PM	82	1277.50	CEUX
GENMAB A/S	02-Apr-2025	14:22:09 PM	20	1277.00	TQEX
GENMAB A/S	02-Apr-2025	14:22:09 PM	8	1277.00	TQEX
GENMAB A/S	02-Apr-2025	14:22:10 PM	72	1276.50	CEUX
GENMAB A/S	02-Apr-2025	14:22:10 PM	8	1276.50	CEUX
GENMAB A/S	02-Apr-2025	14:22:21 PM	43	1277.00	XCSE
GENMAB A/S	02-Apr-2025	14:22:21 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	14:22:21 PM	4	1277.00	XCSE
GENMAB A/S	02-Apr-2025	14:22:50 PM	81	1276.00	XCSE
GENMAB A/S	02-Apr-2025	14:23:00 PM	18	1275.50	TQEX
GENMAB A/S	02-Apr-2025	14:23:15 PM	8	1275.50	TQEX
GENMAB A/S	02-Apr-2025	14:23:29 PM	1	1275.00	XCSE
GENMAB A/S	02-Apr-2025	14:23:29 PM	83	1275.00	XCSE
GENMAB A/S	02-Apr-2025	14:23:29 PM	23	1274.50	TQEX
GENMAB A/S	02-Apr-2025	14:23:29 PM	81	1275.00	CEUX
GENMAB A/S	02-Apr-2025	14:24:32 PM	11	1275.00	CEUX

156

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	14:24:51 PM	25	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:25:11 PM	4	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:25:21 PM	2	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:25:57 PM	39	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:25:57 PM	20	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:25:57 PM	1	1275.00	CEUX
GENMAB A/S	02-Apr-2025	14:25:57 PM	74	1275.00	CEUX
GENMAB A/S	02-Apr-2025	14:26:21 PM	3	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:26:21 PM	57	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:26:21 PM	6	1275.50	XCSE
GENMAB A/S	02-Apr-2025	14:26:39 PM	80	1274.50	XCSE
GENMAB A/S	02-Apr-2025	14:26:39 PM	85	1273.50	XCSE
GENMAB A/S	02-Apr-2025	14:26:39 PM	43	1274.00	AQEU
GENMAB A/S	02-Apr-2025	14:26:39 PM	82	1274.00	CEUX
GENMAB A/S	02-Apr-2025	14:26:47 PM	80	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:26:47 PM	40	1273.00	CEUX
GENMAB A/S	02-Apr-2025	14:26:47 PM	46	1273.00	CEUX
GENMAB A/S	02-Apr-2025	14:27:25 PM	41	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:27:25 PM	1	1272.50	AQEU
GENMAB A/S	02-Apr-2025	14:28:03 PM	1	1272.50	AQEU
GENMAB A/S	02-Apr-2025	14:28:08 PM	13	1272.50	AQEU
GENMAB A/S	02-Apr-2025	14:28:16 PM	3	1272.50	AQEU
GENMAB A/S	02-Apr-2025	14:28:28 PM	12	1272.50	AQEU
GENMAB A/S	02-Apr-2025	14:28:30 PM	84	1272.00	CEUX
GENMAB A/S	02-Apr-2025	14:28:30 PM	1	1272.00	CEUX
GENMAB A/S	02-Apr-2025	14:29:27 PM	22	1271.50	CEUX
GENMAB A/S	02-Apr-2025	14:29:41 PM	1	1271.50	CEUX
GENMAB A/S	02-Apr-2025	14:29:41 PM	1	1271.50	CEUX
GENMAB A/S	02-Apr-2025	14:30:39 PM	82	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:32:17 PM	35	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:32:17 PM	24	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:32:17 PM	21	1271.50	CEUX
GENMAB A/S	02-Apr-2025	14:32:52 PM	50	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:32:52 PM	24	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:32:52 PM	19	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:32:52 PM	80	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:32:52 PM	9	1271.50	CEUX
GENMAB A/S	02-Apr-2025	14:35:26 PM	17	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:35:42 PM	29	1272.00	TQEX
GENMAB A/S	02-Apr-2025	14:37:01 PM	50	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:37:01 PM	37	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:37:01 PM	9	1272.00	TQEX
GENMAB A/S	02-Apr-2025	14:37:30 PM	13	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:37:30 PM	18	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:38:24 PM	2	1272.50	CEUX

157

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	14:38:30 PM	32	1272.50	CEUX
GENMAB A/S	02-Apr-2025	14:39:02 PM	19	1272.50	CEUX
GENMAB A/S	02-Apr-2025	14:39:47 PM	19	1273.00	TQEX
GENMAB A/S	02-Apr-2025	14:39:47 PM	6	1273.00	TQEX
GENMAB A/S	02-Apr-2025	14:40:03 PM	28	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:03 PM	19	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:03 PM	1	1273.50	CEUX
GENMAB A/S	02-Apr-2025	14:40:03 PM	11	1273.50	CEUX
GENMAB A/S	02-Apr-2025	14:40:03 PM	30	1273.50	CEUX
GENMAB A/S	02-Apr-2025	14:40:03 PM	12	1273.50	CEUX
GENMAB A/S	02-Apr-2025	14:40:18 PM	11	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:18 PM	11	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	24	1273.50	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	15	1273.50	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	24	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	13	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	33	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	16	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	25	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	9	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	11	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	12	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	11	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	9	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:22 PM	43	1273.50	CEUX
GENMAB A/S	02-Apr-2025	14:40:22 PM	38	1273.50	CEUX
GENMAB A/S	02-Apr-2025	14:40:23 PM	6	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:24 PM	39	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:24 PM	11	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:40:24 PM	14	1274.00	XCSE
GENMAB A/S	02-Apr-2025	14:41:00 PM	86	1273.00	XCSE
GENMAB A/S	02-Apr-2025	14:41:00 PM	25	1273.00	TQEX
GENMAB A/S	02-Apr-2025	14:41:00 PM	61	1272.50	CEUX
GENMAB A/S	02-Apr-2025	14:41:15 PM	4	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:41:15 PM	79	1272.00	XCSE
GENMAB A/S	02-Apr-2025	14:41:15 PM	26	1272.00	TQEX
GENMAB A/S	02-Apr-2025	14:41:21 PM	3	1271.50	CEUX
GENMAB A/S	02-Apr-2025	14:41:46 PM	81	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:41:58 PM	62	1270.50	CEUX
GENMAB A/S	02-Apr-2025	14:41:58 PM	21	1270.50	CEUX
GENMAB A/S	02-Apr-2025	14:42:21 PM	80	1272.50	XCSE
GENMAB A/S	02-Apr-2025	14:42:21 PM	6	1273.00	CEUX
GENMAB A/S	02-Apr-2025	14:42:21 PM	74	1273.00	CEUX
GENMAB A/S	02-Apr-2025	14:43:26 PM	43	1272.00	CEUX
GENMAB A/S	02-Apr-2025	14:43:26 PM	41	1272.00	CEUX

158

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	14:43:37 PM	85	1271.50	XCSE
GENMAB A/S	02-Apr-2025	14:44:09 PM	86	1271.00	CEUX
GENMAB A/S	02-Apr-2025	14:44:09 PM	1	1271.00	CEUX
GENMAB A/S	02-Apr-2025	14:44:12 PM	84	1270.50	XCSE
GENMAB A/S	02-Apr-2025	14:44:12 PM	30	1270.50	TQEX
GENMAB A/S	02-Apr-2025	14:44:25 PM	11	1270.00	CEUX
GENMAB A/S	02-Apr-2025	14:44:25 PM	34	1270.00	CEUX
GENMAB A/S	02-Apr-2025	14:46:44 PM	51	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:47:33 PM	33	1271.50	XCSE
GENMAB A/S	02-Apr-2025	14:47:36 PM	1	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:49:09 PM	41	1271.50	XCSE
GENMAB A/S	02-Apr-2025	14:49:10 PM	45	1271.50	XCSE
GENMAB A/S	02-Apr-2025	14:49:11 PM	64	1271.50	XCSE
GENMAB A/S	02-Apr-2025	14:49:11 PM	14	1271.50	XCSE
GENMAB A/S	02-Apr-2025	14:49:11 PM	31	1271.50	XCSE
GENMAB A/S	02-Apr-2025	14:49:12 PM	84	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:49:13 PM	39	1270.50	CEUX
GENMAB A/S	02-Apr-2025	14:49:13 PM	5	1270.50	CEUX
GENMAB A/S	02-Apr-2025	14:50:24 PM	11	1270.00	TQEX
GENMAB A/S	02-Apr-2025	14:50:25 PM	81	1270.00	XCSE
GENMAB A/S	02-Apr-2025	14:50:25 PM	2	1270.00	TQEX
GENMAB A/S	02-Apr-2025	14:50:26 PM	9	1270.00	TQEX
GENMAB A/S	02-Apr-2025	14:50:28 PM	3	1270.00	TQEX
GENMAB A/S	02-Apr-2025	14:51:31 PM	47	1269.50	CEUX
GENMAB A/S	02-Apr-2025	14:51:50 PM	84	1269.00	XCSE
GENMAB A/S	02-Apr-2025	14:51:50 PM	11	1269.00	TQEX
GENMAB A/S	02-Apr-2025	14:51:50 PM	16	1269.00	TQEX
GENMAB A/S	02-Apr-2025	14:51:50 PM	10	1268.50	CEUX
GENMAB A/S	02-Apr-2025	14:51:50 PM	15	1268.50	CEUX
GENMAB A/S	02-Apr-2025	14:51:50 PM	1	1268.50	CEUX
GENMAB A/S	02-Apr-2025	14:52:21 PM	31	1269.50	CEUX
GENMAB A/S	02-Apr-2025	14:52:21 PM	3	1269.50	CEUX
GENMAB A/S	02-Apr-2025	14:52:50 PM	9	1269.50	CEUX
GENMAB A/S	02-Apr-2025	14:52:50 PM	37	1269.50	CEUX
GENMAB A/S	02-Apr-2025	14:53:11 PM	46	1270.00	XCSE
GENMAB A/S	02-Apr-2025	14:53:11 PM	41	1270.00	XCSE
GENMAB A/S	02-Apr-2025	14:53:11 PM	12	1270.00	XCSE
GENMAB A/S	02-Apr-2025	14:53:11 PM	6	1270.00	XCSE
GENMAB A/S	02-Apr-2025	14:55:52 PM	23	1270.50	AQEU
GENMAB A/S	02-Apr-2025	14:56:26 PM	35	1270.50	XCSE
GENMAB A/S	02-Apr-2025	14:56:27 PM	1	1270.50	XCSE
GENMAB A/S	02-Apr-2025	14:56:40 PM	82	1270.00	CEUX
GENMAB A/S	02-Apr-2025	14:56:43 PM	10	1270.50	XCSE
GENMAB A/S	02-Apr-2025	14:56:43 PM	15	1270.50	XCSE
GENMAB A/S	02-Apr-2025	14:56:43 PM	41	1270.50	XCSE

159

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	14:57:06 PM	33	1270.00	XCSE
GENMAB A/S	02-Apr-2025	14:57:08 PM	44	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:57:08 PM	11	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:57:08 PM	54	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:57:08 PM	43	1270.50	CEUX
GENMAB A/S	02-Apr-2025	14:57:27 PM	11	1270.50	AQEU
GENMAB A/S	02-Apr-2025	14:58:19 PM	29	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:58:19 PM	51	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:58:19 PM	14	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:58:19 PM	51	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:58:40 PM	69	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:59:01 PM	2	1270.50	AQEU
GENMAB A/S	02-Apr-2025	14:59:21 PM	31	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:59:21 PM	18	1271.00	XCSE
GENMAB A/S	02-Apr-2025	14:59:21 PM	2	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:01:08 PM	27	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:01:17 PM	10	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:01:17 PM	78	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:01:17 PM	10	1271.00	CEUX
GENMAB A/S	02-Apr-2025	15:01:17 PM	16	1271.00	CEUX
GENMAB A/S	02-Apr-2025	15:01:21 PM	41	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:01:21 PM	27	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:01:21 PM	86	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:01:21 PM	34	1271.00	TQEX
GENMAB A/S	02-Apr-2025	15:01:21 PM	10	1270.50	AQEU
GENMAB A/S	02-Apr-2025	15:01:21 PM	39	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:01:21 PM	2	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:01:26 PM	9	1270.00	TQEX
GENMAB A/S	02-Apr-2025	15:01:36 PM	52	1270.00	XCSE
GENMAB A/S	02-Apr-2025	15:01:36 PM	14	1270.00	TQEX
GENMAB A/S	02-Apr-2025	15:01:37 PM	64	1269.50	CEUX
GENMAB A/S	02-Apr-2025	15:01:37 PM	20	1269.50	CEUX
GENMAB A/S	02-Apr-2025	15:04:28 PM	83	1270.50	XCSE
GENMAB A/S	02-Apr-2025	15:04:28 PM	30	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:04:28 PM	52	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:04:29 PM	26	1270.50	XCSE
GENMAB A/S	02-Apr-2025	15:04:45 PM	27	1270.50	XCSE
GENMAB A/S	02-Apr-2025	15:05:26 PM	7	1270.50	XCSE
GENMAB A/S	02-Apr-2025	15:05:27 PM	40	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:05:27 PM	4	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:05:27 PM	34	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:05:27 PM	36	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:05:27 PM	1	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:05:27 PM	43	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:06:10 PM	3	1270.50	XCSE

160

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:06:10 PM	28	1270.00	TQEX
GENMAB A/S	02-Apr-2025	15:06:25 PM	15	1270.00	AQEU
GENMAB A/S	02-Apr-2025	15:07:27 PM	3	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:07:28 PM	29	1271.00	TQEX
GENMAB A/S	02-Apr-2025	15:07:28 PM	23	1271.00	AQEU
GENMAB A/S	02-Apr-2025	15:08:03 PM	8	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:08:59 PM	80	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:08:59 PM	23	1271.00	TQEX
GENMAB A/S	02-Apr-2025	15:09:28 PM	3	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:28 PM	27	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:28 PM	6	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:28 PM	7	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:28 PM	6	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:37 PM	33	1272.00	TQEX
GENMAB A/S	02-Apr-2025	15:09:37 PM	13	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:37 PM	10	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:37 PM	4	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:37 PM	21	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:09:40 PM	16	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:40 PM	27	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:40 PM	33	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:46 PM	12	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:46 PM	2	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:47 PM	14	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:47 PM	22	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:47 PM	11	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:47 PM	39	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:47 PM	23	1272.00	XCSE
GENMAB A/S	02-Apr-2025	15:09:47 PM	29	1271.50	CEUX
GENMAB A/S	02-Apr-2025	15:09:47 PM	57	1271.50	CEUX
GENMAB A/S	02-Apr-2025	15:09:54 PM	10	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:09:57 PM	4	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:00 PM	3	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:00 PM	2	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:02 PM	87	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:10:02 PM	11	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:02 PM	36	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:02 PM	9	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:02 PM	30	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:02 PM	23	1271.50	XCSE
GENMAB A/S	02-Apr-2025	15:10:02 PM	23	1271.00	AQEU
GENMAB A/S	02-Apr-2025	15:10:08 PM	9	1270.00	AQEU
GENMAB A/S	02-Apr-2025	15:10:08 PM	77	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:10:43 PM	87	1269.50	CEUX
GENMAB A/S	02-Apr-2025	15:10:55 PM	80	1269.50	XCSE

161

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:11:07 PM	43	1269.50	CEUX
GENMAB A/S	02-Apr-2025	15:11:07 PM	11	1269.50	CEUX
GENMAB A/S	02-Apr-2025	15:13:26 PM	12	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:13:26 PM	51	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:13:26 PM	46	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:13:27 PM	6	1269.00	AQEU
GENMAB A/S	02-Apr-2025	15:14:25 PM	37	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:14:25 PM	14	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:14:25 PM	51	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:14:25 PM	7	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:14:26 PM	51	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:14:26 PM	11	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:14:26 PM	6	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:14:35 PM	18	1269.00	AQEU
GENMAB A/S	02-Apr-2025	15:15:04 PM	15	1269.00	TQEX
GENMAB A/S	02-Apr-2025	15:15:04 PM	8	1269.00	TQEX
GENMAB A/S	02-Apr-2025	15:15:05 PM	8	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:16:26 PM	5	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:16:28 PM	6	1269.50	XCSE
GENMAB A/S	02-Apr-2025	15:17:26 PM	24	1269.00	TQEX
GENMAB A/S	02-Apr-2025	15:17:26 PM	14	1269.00	AQEU
GENMAB A/S	02-Apr-2025	15:17:26 PM	10	1269.00	AQEU
GENMAB A/S	02-Apr-2025	15:17:26 PM	85	1269.00	CEUX
GENMAB A/S	02-Apr-2025	15:17:27 PM	51	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:17:27 PM	6	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:17:27 PM	32	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:17:27 PM	83	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:18:21 PM	36	1269.00	CEUX
GENMAB A/S	02-Apr-2025	15:18:26 PM	3	1269.00	CEUX
GENMAB A/S	02-Apr-2025	15:18:39 PM	23	1269.50	AQEU
GENMAB A/S	02-Apr-2025	15:18:57 PM	36	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:18:57 PM	6	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:18:57 PM	36	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:18:57 PM	11	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:18:57 PM	12	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:19:03 PM	84	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:03 PM	51	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:19:03 PM	30	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:19:03 PM	14	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:19:03 PM	14	1269.00	XCSE
GENMAB A/S	02-Apr-2025	15:19:03 PM	20	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:03 PM	60	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:03 PM	23	1269.00	TQEX
GENMAB A/S	02-Apr-2025	15:19:03 PM	85	1269.00	CEUX
GENMAB A/S	02-Apr-2025	15:19:05 PM	16	1268.50	XCSE

162

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:19:08 PM	11	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:08 PM	4	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:11 PM	4	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:11 PM	3	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:14 PM	48	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:14 PM	4	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:14 PM	2	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:21 PM	4	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:21 PM	39	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:21 PM	2	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:21 PM	85	1267.50	XCSE
GENMAB A/S	02-Apr-2025	15:19:21 PM	16	1268.00	TQEX
GENMAB A/S	02-Apr-2025	15:19:21 PM	13	1268.00	TQEX
GENMAB A/S	02-Apr-2025	15:19:21 PM	82	1268.00	CEUX
GENMAB A/S	02-Apr-2025	15:19:23 PM	20	1267.00	CEUX
GENMAB A/S	02-Apr-2025	15:19:23 PM	54	1267.00	CEUX
GENMAB A/S	02-Apr-2025	15:19:23 PM	7	1267.00	CEUX
GENMAB A/S	02-Apr-2025	15:20:26 PM	13	1267.50	XCSE
GENMAB A/S	02-Apr-2025	15:20:26 PM	73	1267.00	XCSE
GENMAB A/S	02-Apr-2025	15:21:26 PM	9	1267.00	XCSE
GENMAB A/S	02-Apr-2025	15:21:26 PM	5	1267.00	AQEU
GENMAB A/S	02-Apr-2025	15:21:26 PM	24	1267.00	CEUX
GENMAB A/S	02-Apr-2025	15:22:51 PM	30	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:22:51 PM	38	1268.00	XCSE
GENMAB A/S	02-Apr-2025	15:22:51 PM	43	1268.00	XCSE
GENMAB A/S	02-Apr-2025	15:22:51 PM	30	1268.00	XCSE
GENMAB A/S	02-Apr-2025	15:22:51 PM	23	1268.50	TQEX
GENMAB A/S	02-Apr-2025	15:22:51 PM	25	1268.00	AQEU
GENMAB A/S	02-Apr-2025	15:22:51 PM	80	1268.50	CEUX
GENMAB A/S	02-Apr-2025	15:22:53 PM	1	1268.00	XCSE
GENMAB A/S	02-Apr-2025	15:22:59 PM	31	1268.00	XCSE
GENMAB A/S	02-Apr-2025	15:22:59 PM	17	1268.00	XCSE
GENMAB A/S	02-Apr-2025	15:22:59 PM	51	1268.00	XCSE
GENMAB A/S	02-Apr-2025	15:22:59 PM	23	1267.50	TQEX
GENMAB A/S	02-Apr-2025	15:22:59 PM	70	1267.50	CEUX
GENMAB A/S	02-Apr-2025	15:22:59 PM	10	1267.50	CEUX
GENMAB A/S	02-Apr-2025	15:23:12 PM	83	1267.00	XCSE
GENMAB A/S	02-Apr-2025	15:25:08 PM	37	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:08 PM	11	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:08 PM	26	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:08 PM	11	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:26 PM	7	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:27 PM	14	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:27 PM	1	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:44 PM	13	1268.50	XCSE

163

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:25:44 PM	34	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:44 PM	51	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:44 PM	3	1268.50	XCSE
GENMAB A/S	02-Apr-2025	15:25:47 PM	24	1268.50	CEUX
GENMAB A/S	02-Apr-2025	15:25:47 PM	16	1268.50	CEUX
GENMAB A/S	02-Apr-2025	15:25:47 PM	34	1268.50	CEUX
GENMAB A/S	02-Apr-2025	15:27:50 PM	23	1269.00	CEUX
GENMAB A/S	02-Apr-2025	15:27:50 PM	18	1269.00	CEUX
GENMAB A/S	02-Apr-2025	15:28:06 PM	28	1270.00	XCSE
GENMAB A/S	02-Apr-2025	15:28:07 PM	11	1270.00	XCSE
GENMAB A/S	02-Apr-2025	15:28:22 PM	36	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:28:22 PM	6	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:28:22 PM	6	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:28:22 PM	7	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:28:26 PM	11	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:29:13 PM	78	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:29:13 PM	7	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:29:22 PM	36	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:29:26 PM	5	1270.00	XCSE
GENMAB A/S	02-Apr-2025	15:29:26 PM	3	1270.00	CEUX
GENMAB A/S	02-Apr-2025	15:29:30 PM	7	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:29:30 PM	6	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:29:30 PM	34	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:29:33 PM	80	1270.50	XCSE
GENMAB A/S	02-Apr-2025	15:29:33 PM	42	1270.50	TQEX
GENMAB A/S	02-Apr-2025	15:29:33 PM	18	1270.50	AQEU
GENMAB A/S	02-Apr-2025	15:29:33 PM	26	1270.50	CEUX
GENMAB A/S	02-Apr-2025	15:29:34 PM	22	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:29:34 PM	12	1271.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:00 PM	36	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:30:00 PM	18	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:30:00 PM	21	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:30:00 PM	8	1272.00	CEUX
GENMAB A/S	02-Apr-2025	15:30:02 PM	82	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:02 PM	51	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:02 PM	24	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:02 PM	28	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:02 PM	6	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:02 PM	50	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:02 PM	15	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:02 PM	34	1273.00	AQEU
GENMAB A/S	02-Apr-2025	15:30:02 PM	84	1273.00	CEUX
GENMAB A/S	02-Apr-2025	15:30:04 PM	15	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:04 PM	28	1273.00	XCSE
GENMAB A/S	02-Apr-2025	15:30:06 PM	24	1273.50	AQEU

164

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:30:36 PM	38	1274.50	XCSE
GENMAB A/S	02-Apr-2025	15:30:36 PM	20	1274.50	XCSE
GENMAB A/S	02-Apr-2025	15:30:36 PM	51	1274.50	XCSE
GENMAB A/S	02-Apr-2025	15:30:37 PM	12	1274.50	XCSE
GENMAB A/S	02-Apr-2025	15:30:53 PM	10	1275.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:03 PM	81	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:03 PM	3	1275.50	AQEU
GENMAB A/S	02-Apr-2025	15:31:03 PM	24	1275.50	AQEU
GENMAB A/S	02-Apr-2025	15:31:03 PM	36	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:31:04 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:04 PM	12	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:04 PM	14	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:04 PM	51	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:04 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:04 PM	51	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:05 PM	24	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:05 PM	59	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:05 PM	49	1275.00	TQEX
GENMAB A/S	02-Apr-2025	15:31:05 PM	25	1275.50	AQEU
GENMAB A/S	02-Apr-2025	15:31:05 PM	85	1275.00	CEUX
GENMAB A/S	02-Apr-2025	15:31:05 PM	35	1275.00	CEUX
GENMAB A/S	02-Apr-2025	15:31:05 PM	36	1275.50	CEUX
GENMAB A/S	02-Apr-2025	15:31:05 PM	6	1275.50	CEUX
GENMAB A/S	02-Apr-2025	15:31:05 PM	7	1275.50	CEUX
GENMAB A/S	02-Apr-2025	15:31:07 PM	30	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:07 PM	51	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:07 PM	15	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:07 PM	13	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:07 PM	32	1275.00	CEUX
GENMAB A/S	02-Apr-2025	15:31:07 PM	54	1275.00	CEUX
GENMAB A/S	02-Apr-2025	15:31:18 PM	7	1275.00	AQEU
GENMAB A/S	02-Apr-2025	15:31:27 PM	7	1275.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:27 PM	51	1275.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:27 PM	16	1275.00	AQEU
GENMAB A/S	02-Apr-2025	15:31:39 PM	2	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:39 PM	59	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:39 PM	18	1276.00	TQEX
GENMAB A/S	02-Apr-2025	15:31:39 PM	26	1276.00	TQEX
GENMAB A/S	02-Apr-2025	15:31:44 PM	38	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:45 PM	32	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:45 PM	51	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:45 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:45 PM	13	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:45 PM	2	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	9	1277.50	XCSE

165

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:31:46 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	51	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	13	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	28	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	13	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	32	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:46 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	46	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	49	1277.50	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	27	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	51	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	8	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	5	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	51	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	28	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:48 PM	31	1277.00	TQEX
GENMAB A/S	02-Apr-2025	15:31:48 PM	84	1276.50	CEUX
GENMAB A/S	02-Apr-2025	15:31:49 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:49 PM	28	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:49 PM	51	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:49 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:31:49 PM	5	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:00 PM	22	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:00 PM	70	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:00 PM	29	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:00 PM	10	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:00 PM	29	1276.00	TQEX
GENMAB A/S	02-Apr-2025	15:32:01 PM	82	1275.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:01 PM	29	1275.00	TQEX
GENMAB A/S	02-Apr-2025	15:32:01 PM	86	1275.00	CEUX
GENMAB A/S	02-Apr-2025	15:32:02 PM	86	1274.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:02 PM	82	1274.00	CEUX
GENMAB A/S	02-Apr-2025	15:32:08 PM	43	1277.00	CEUX
GENMAB A/S	02-Apr-2025	15:32:08 PM	36	1277.00	CEUX
GENMAB A/S	02-Apr-2025	15:32:19 PM	38	1278.00	CEUX

166

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:32:31 PM	45	1279.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:31 PM	44	1279.00	XCSE
GENMAB A/S	02-Apr-2025	15:32:31 PM	87	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:32:31 PM	14	1279.50	TQEX
GENMAB A/S	02-Apr-2025	15:32:31 PM	15	1279.50	TQEX
GENMAB A/S	02-Apr-2025	15:32:31 PM	24	1279.50	AQEU
GENMAB A/S	02-Apr-2025	15:32:37 PM	79	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:32:46 PM	77	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:33:03 PM	19	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:33:03 PM	52	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:33:03 PM	13	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:33:17 PM	30	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:33:17 PM	51	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:33:32 PM	87	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:33:32 PM	51	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:33:32 PM	24	1281.00	AQEU
GENMAB A/S	02-Apr-2025	15:33:39 PM	29	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:33:39 PM	57	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:33:39 PM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:33:39 PM	27	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:33:39 PM	51	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:33:39 PM	20	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:33:39 PM	23	1280.50	TQEX
GENMAB A/S	02-Apr-2025	15:33:39 PM	23	1279.50	TQEX
GENMAB A/S	02-Apr-2025	15:33:39 PM	28	1280.00	AQEU
GENMAB A/S	02-Apr-2025	15:33:39 PM	23	1279.50	AQEU
GENMAB A/S	02-Apr-2025	15:33:39 PM	23	1280.50	CEUX
GENMAB A/S	02-Apr-2025	15:33:39 PM	64	1280.50	CEUX
GENMAB A/S	02-Apr-2025	15:33:42 PM	87	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:33:42 PM	61	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:33:42 PM	19	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:34:11 PM	6	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:34:26 PM	7	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:34:26 PM	9	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:33 PM	82	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:34:33 PM	45	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:34:33 PM	50	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:34:33 PM	14	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:34:33 PM	8	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:33 PM	44	1279.50	TQEX
GENMAB A/S	02-Apr-2025	15:34:33 PM	35	1279.00	AQEU
GENMAB A/S	02-Apr-2025	15:34:33 PM	84	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:34:45 PM	39	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	26	1278.50	XCSE

167

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:34:45 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	12	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	12	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:45 PM	24	1278.00	CEUX
GENMAB A/S	02-Apr-2025	15:34:51 PM	1	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:51 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:34:51 PM	13	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:35:01 PM	25	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:35:01 PM	15	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:35:01 PM	6	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:35:01 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:35:01 PM	39	1278.50	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	85	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	30	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	30	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	2	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	25	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:35:30 PM	23	1279.50	TQEX
GENMAB A/S	02-Apr-2025	15:35:30 PM	86	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:35:31 PM	15	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:36:27 PM	8	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:29 PM	12	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:36:29 PM	16	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:36:29 PM	3	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:36:29 PM	1	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:36:29 PM	72	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:36:29 PM	13	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:36:30 PM	22	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:30 PM	14	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:30 PM	11	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:30 PM	13	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:30 PM	15	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:30 PM	34	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:30 PM	13	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:30 PM	10	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:34 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:34 PM	6	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:34 PM	17	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:36:34 PM	29	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:36:34 PM	40	1281.00	XCSE

168

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:36:46 PM	85	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:37:14 PM	44	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:37:14 PM	65	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:37:29 PM	5	1282.50	TQEX
GENMAB A/S	02-Apr-2025	15:37:29 PM	20	1282.50	TQEX
GENMAB A/S	02-Apr-2025	15:37:29 PM	82	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:37:30 PM	23	1282.50	AQEU
GENMAB A/S	02-Apr-2025	15:37:33 PM	86	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:37:51 PM	39	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:37:51 PM	9	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:37:51 PM	23	1281.50	TQEX
GENMAB A/S	02-Apr-2025	15:37:51 PM	80	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:38:39 PM	85	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:38:39 PM	19	1281.50	TQEX
GENMAB A/S	02-Apr-2025	15:38:39 PM	82	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:38:56 PM	38	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:38:56 PM	29	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:38:56 PM	2	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:38:56 PM	39	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:39:01 PM	27	1281.50	TQEX
GENMAB A/S	02-Apr-2025	15:39:01 PM	85	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:39:27 PM	85	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:39:27 PM	2	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:39:27 PM	21	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:39:30 PM	35	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:02 PM	2	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:40:26 PM	10	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	39	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	5	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	28	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	37	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	87	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	39	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	14	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	13	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	12	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:37 PM	24	1281.00	TQEX
GENMAB A/S	02-Apr-2025	15:40:37 PM	1	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	10	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	13	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	2	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	43	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	84	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	66	1280.50	CEUX
GENMAB A/S	02-Apr-2025	15:40:37 PM	15	1280.50	CEUX

169

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:40:38 PM	41	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:39 PM	46	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:40:39 PM	39	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:40:39 PM	14	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:40:39 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:40:39 PM	23	1280.00	TQEX
GENMAB A/S	02-Apr-2025	15:40:39 PM	23	1280.50	AQEU
GENMAB A/S	02-Apr-2025	15:40:39 PM	83	1280.50	CEUX
GENMAB A/S	02-Apr-2025	15:40:41 PM	60	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:40:45 PM	27	1279.50	AQEU
GENMAB A/S	02-Apr-2025	15:41:00 PM	2	1282.50	AQEU
GENMAB A/S	02-Apr-2025	15:41:00 PM	22	1282.50	AQEU
GENMAB A/S	02-Apr-2025	15:41:01 PM	38	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:41:07 PM	46	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:41:07 PM	73	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:41:08 PM	3	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:41:08 PM	39	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:41:26 PM	23	1281.00	TQEX
GENMAB A/S	02-Apr-2025	15:41:26 PM	23	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:41:41 PM	85	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:41:41 PM	39	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:41:41 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:41:41 PM	13	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:41:41 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:41:42 PM	51	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:41:42 PM	11	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:42:10 PM	83	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:42:11 PM	26	1280.50	AQEU
GENMAB A/S	02-Apr-2025	15:42:27 PM	28	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:42:27 PM	2	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:42:27 PM	13	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:42:27 PM	40	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:42:34 PM	10	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:42:35 PM	8	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:43:04 PM	23	1281.00	TQEX
GENMAB A/S	02-Apr-2025	15:43:04 PM	19	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:43:04 PM	49	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:43:09 PM	87	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:43:09 PM	39	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:43:09 PM	20	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:43:09 PM	39	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:43:09 PM	11	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:43:09 PM	33	1280.50	AQEU
GENMAB A/S	02-Apr-2025	15:43:37 PM	84	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:43:37 PM	45	1280.50	XCSE

170

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:43:37 PM	24	1280.50	AQEU
GENMAB A/S	02-Apr-2025	15:43:37 PM	48	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:43:38 PM	51	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:43:38 PM	30	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:43:38 PM	24	1279.50	TQEX
GENMAB A/S	02-Apr-2025	15:43:56 PM	15	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:43:56 PM	37	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:44:14 PM	21	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:44:15 PM	22	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:44:15 PM	38	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:44:22 PM	13	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:44:22 PM	39	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:44:22 PM	13	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:44:22 PM	12	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:44:22 PM	30	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:44:22 PM	2	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:44:25 PM	1	1279.50	CEUX
GENMAB A/S	02-Apr-2025	15:44:28 PM	83	1279.50	CEUX
GENMAB A/S	02-Apr-2025	15:44:41 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:16 PM	44	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:16 PM	45	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:16 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:16 PM	23	1280.50	TQEX
GENMAB A/S	02-Apr-2025	15:45:48 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:48 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:48 PM	44	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	83	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	14	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	39	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	11	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	30	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	4	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:45:55 PM	18	1280.00	AQEU
GENMAB A/S	02-Apr-2025	15:45:55 PM	10	1280.00	AQEU
GENMAB A/S	02-Apr-2025	15:45:55 PM	22	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:45:55 PM	56	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:46:02 PM	9	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:46:27 PM	69	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:46:28 PM	41	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:46:28 PM	33	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:46:28 PM	9	1281.00	CEUX
GENMAB A/S	02-Apr-2025	15:46:57 PM	80	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:46:57 PM	6	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:46:57 PM	17	1280.50	TQEX

171

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:46:57 PM	7	1280.50	TQEX
GENMAB A/S	02-Apr-2025	15:47:14 PM	18	1280.00	CEUX
GENMAB A/S	02-Apr-2025	15:47:22 PM	25	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:47:22 PM	15	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:47:22 PM	10	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:47:35 PM	39	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:47:36 PM	46	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:10 PM	35	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:48:10 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:48:10 PM	37	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:48:10 PM	7	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:48:10 PM	82	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:48:11 PM	14	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:11 PM	13	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:11 PM	39	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:11 PM	27	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:11 PM	16	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:11 PM	13	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:11 PM	14	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:11 PM	82	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:12 PM	34	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:12 PM	11	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:12 PM	39	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:12 PM	14	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:12 PM	11	1283.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:25 PM	44	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:31 PM	37	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:48:31 PM	28	1282.50	TQEX
GENMAB A/S	02-Apr-2025	15:48:31 PM	67	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:48:31 PM	13	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:49:12 PM	84	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:12 PM	39	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:12 PM	29	1281.50	TQEX
GENMAB A/S	02-Apr-2025	15:49:12 PM	81	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:49:26 PM	4	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:27 PM	11	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:27 PM	13	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:27 PM	13	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:28 PM	14	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:31 PM	13	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:49:40 PM	13	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:03 PM	68	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:03 PM	30	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	66	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	16	1281.50	XCSE

172

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:50:04 PM	39	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	9	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	11	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	24	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:50:04 PM	23	1281.50	TQEX
GENMAB A/S	02-Apr-2025	15:50:04 PM	80	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:50:04 PM	5	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:50:19 PM	18	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:50:21 PM	11	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:21 PM	12	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:32 PM	30	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:32 PM	39	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:32 PM	13	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:32 PM	11	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:32 PM	16	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:32 PM	28	1282.00	TQEX
GENMAB A/S	02-Apr-2025	15:50:32 PM	67	1282.00	CEUX
GENMAB A/S	02-Apr-2025	15:50:58 PM	6	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:58 PM	39	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:58 PM	23	1282.00	TQEX
GENMAB A/S	02-Apr-2025	15:50:59 PM	11	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:59 PM	12	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:59 PM	39	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:59 PM	14	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:59 PM	13	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:50:59 PM	20	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:51:03 PM	16	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:51:13 PM	20	1282.00	TQEX
GENMAB A/S	02-Apr-2025	15:51:14 PM	19	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:51:41 PM	52	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:51:41 PM	8	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:51:41 PM	2	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:51:41 PM	1	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:51:41 PM	91	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:51:42 PM	52	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:51:42 PM	1	1282.50	XCSE
GENMAB A/S	02-Apr-2025	15:51:43 PM	17	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:51:59 PM	11	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:51:59 PM	39	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:51:59 PM	24	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:01 PM	39	1284.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:01 PM	11	1284.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:01 PM	37	1284.00	XCSE

173

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:53:01 PM	1	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:01 PM	15	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:01 PM	64	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:01 PM	23	1283.00	TQEX
GENMAB A/S	02-Apr-2025	15:53:01 PM	23	1283.50	AQEU
GENMAB A/S	02-Apr-2025	15:53:01 PM	25	1283.50	CEUX
GENMAB A/S	02-Apr-2025	15:53:01 PM	23	1283.00	CEUX
GENMAB A/S	02-Apr-2025	15:53:01 PM	25	1283.00	CEUX
GENMAB A/S	02-Apr-2025	15:53:03 PM	32	1283.00	CEUX
GENMAB A/S	02-Apr-2025	15:53:10 PM	38	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:53:10 PM	49	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:53:11 PM	45	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:12 PM	11	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:12 PM	22	1283.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:14 PM	20	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:14 PM	9	1282.50	TQEX
GENMAB A/S	02-Apr-2025	15:53:14 PM	14	1282.50	TQEX
GENMAB A/S	02-Apr-2025	15:53:14 PM	80	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:53:14 PM	7	1282.50	CEUX
GENMAB A/S	02-Apr-2025	15:53:23 PM	24	1282.00	AQEU
GENMAB A/S	02-Apr-2025	15:53:26 PM	39	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:26 PM	21	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:26 PM	13	1282.00	XCSE
GENMAB A/S	02-Apr-2025	15:53:26 PM	85	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:53:26 PM	28	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:53:26 PM	59	1281.50	CEUX
GENMAB A/S	02-Apr-2025	15:53:32 PM	24	1281.00	AQEU
GENMAB A/S	02-Apr-2025	15:53:50 PM	24	1281.00	TQEX
GENMAB A/S	02-Apr-2025	15:53:53 PM	13	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:53:55 PM	17	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:53:59 PM	27	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:53:59 PM	12	1281.50	XCSE
GENMAB A/S	02-Apr-2025	15:54:00 PM	12	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:54:00 PM	1	1281.00	XCSE
GENMAB A/S	02-Apr-2025	15:54:00 PM	16	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:54:02 PM	25	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:54:05 PM	16	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:54:10 PM	23	1280.50	XCSE
GENMAB A/S	02-Apr-2025	15:54:10 PM	87	1280.50	CEUX
GENMAB A/S	02-Apr-2025	15:54:24 PM	28	1280.50	CEUX
GENMAB A/S	02-Apr-2025	15:54:51 PM	17	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:54:51 PM	23	1280.00	AQEU
GENMAB A/S	02-Apr-2025	15:54:51 PM	56	1280.50	CEUX
GENMAB A/S	02-Apr-2025	15:55:00 PM	19	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:00 PM	39	1280.00	XCSE

174

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:55:00 PM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:00 PM	14	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:00 PM	26	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:17 PM	18	1279.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:17 PM	35	1279.50	AQEU
GENMAB A/S	02-Apr-2025	15:55:27 PM	12	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:27 PM	39	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:27 PM	13	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:27 PM	11	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:27 PM	28	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:27 PM	6	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:27 PM	28	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:27 PM	9	1280.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:36 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:36 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:36 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:36 PM	39	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:36 PM	24	1279.50	AQEU
GENMAB A/S	02-Apr-2025	15:55:39 PM	10	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:55:41 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:41 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:41 PM	19	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:41 PM	39	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:41 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:41 PM	15	1279.50	XCSE
GENMAB A/S	02-Apr-2025	15:55:41 PM	44	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:55:59 PM	3	1279.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:59 PM	35	1279.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:59 PM	20	1279.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:59 PM	10	1279.00	XCSE
GENMAB A/S	02-Apr-2025	15:55:59 PM	26	1279.00	TQEX
GENMAB A/S	02-Apr-2025	15:55:59 PM	15	1278.50	AQEU
GENMAB A/S	02-Apr-2025	15:55:59 PM	9	1278.50	AQEU
GENMAB A/S	02-Apr-2025	15:55:59 PM	26	1279.00	CEUX
GENMAB A/S	02-Apr-2025	15:56:05 PM	19	1278.50	AQEU
GENMAB A/S	02-Apr-2025	15:56:05 PM	8	1278.50	AQEU
GENMAB A/S	02-Apr-2025	15:56:05 PM	83	1278.50	CEUX
GENMAB A/S	02-Apr-2025	15:56:17 PM	20	1278.00	XCSE
GENMAB A/S	02-Apr-2025	15:56:17 PM	19	1278.00	XCSE
GENMAB A/S	02-Apr-2025	15:56:17 PM	20	1278.00	XCSE
GENMAB A/S	02-Apr-2025	15:56:17 PM	22	1278.00	XCSE
GENMAB A/S	02-Apr-2025	15:56:17 PM	4	1278.00	TQEX
GENMAB A/S	02-Apr-2025	15:56:17 PM	17	1278.00	TQEX
GENMAB A/S	02-Apr-2025	15:56:17 PM	3	1278.00	TQEX
GENMAB A/S	02-Apr-2025	15:56:18 PM	70	1277.50	CEUX

175

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:56:18 PM	9	1277.50	CEUX
GENMAB A/S	02-Apr-2025	15:56:21 PM	81	1276.50	XCSE
GENMAB A/S	02-Apr-2025	15:56:21 PM	23	1277.00	TQEX
GENMAB A/S	02-Apr-2025	15:56:21 PM	28	1277.00	AQEU
GENMAB A/S	02-Apr-2025	15:56:21 PM	20	1276.00	AQEU
GENMAB A/S	02-Apr-2025	15:56:21 PM	4	1276.00	AQEU
GENMAB A/S	02-Apr-2025	15:56:21 PM	15	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:56:21 PM	24	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:56:25 PM	3	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:56:27 PM	15	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:56:42 PM	10	1276.50	AQEU
GENMAB A/S	02-Apr-2025	15:56:58 PM	22	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:56:58 PM	19	1277.50	AQEU
GENMAB A/S	02-Apr-2025	15:56:58 PM	14	1277.50	AQEU
GENMAB A/S	02-Apr-2025	15:57:00 PM	2	1277.50	AQEU
GENMAB A/S	02-Apr-2025	15:57:19 PM	65	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:57:19 PM	60	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:57:19 PM	39	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:57:19 PM	10	1277.00	XCSE
GENMAB A/S	02-Apr-2025	15:57:19 PM	9	1277.00	CEUX
GENMAB A/S	02-Apr-2025	15:57:19 PM	70	1277.00	CEUX
GENMAB A/S	02-Apr-2025	15:57:24 PM	8	1276.50	AQEU
GENMAB A/S	02-Apr-2025	15:57:52 PM	4	1276.50	AQEU
GENMAB A/S	02-Apr-2025	15:57:59 PM	7	1276.50	AQEU
GENMAB A/S	02-Apr-2025	15:58:26 PM	9	1276.50	XCSE
GENMAB A/S	02-Apr-2025	15:59:01 PM	30	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:59:26 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:26 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:26 PM	44	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:26 PM	39	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:59:26 PM	43	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:59:32 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:32 PM	11	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:32 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:33 PM	11	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:33 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:33 PM	14	1276.00	XCSE
GENMAB A/S	02-Apr-2025	15:59:33 PM	23	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:59:33 PM	46	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:59:35 PM	12	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:59:35 PM	2	1275.50	XCSE
GENMAB A/S	02-Apr-2025	15:59:37 PM	24	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:59:37 PM	21	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:59:37 PM	53	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:59:37 PM	6	1276.00	CEUX

176

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	15:59:37 PM	5	1276.00	CEUX
GENMAB A/S	02-Apr-2025	15:59:59 PM	31	1275.00	TQEX
GENMAB A/S	02-Apr-2025	15:59:59 PM	31	1275.00	AQEU
GENMAB A/S	02-Apr-2025	15:59:59 PM	80	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:00:01 PM	14	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:00:09 PM	9	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:00:14 PM	54	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:14 PM	9	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:14 PM	32	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:14 PM	14	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:26 PM	5	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:00:27 PM	86	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:00:28 PM	8	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:00:40 PM	2	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:40 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:40 PM	24	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:00:40 PM	35	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:00:40 PM	34	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:00:40 PM	86	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:00:41 PM	1	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:53 PM	6	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:00:59 PM	31	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:01:00 PM	44	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:01:19 PM	5	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:01:28 PM	6	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:01:28 PM	24	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:01:28 PM	23	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:01:30 PM	7	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:01:30 PM	17	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:01:35 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:01:35 PM	18	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:05 PM	24	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:05 PM	58	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:05 PM	39	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:05 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:05 PM	40	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:02:05 PM	41	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:02:05 PM	3	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:02:15 PM	39	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:15 PM	12	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:15 PM	46	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:15 PM	6	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:02:15 PM	13	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:02:27 PM	87	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:27 PM	43	1275.50	CEUX

177

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:02:27 PM	39	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:02:32 PM	39	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:32 PM	11	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:32 PM	23	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:02:33 PM	10	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:33 PM	39	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:34 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:34 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:35 PM	14	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:35 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:35 PM	11	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:35 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:35 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:35 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:35 PM	39	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	11	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	82	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	1	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	14	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	11	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:36 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	14	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	14	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	11	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	12	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	2	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	86	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:02:37 PM	16	1274.50	TQEX
GENMAB A/S	02-Apr-2025	16:02:37 PM	85	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:03:07 PM	80	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:07 PM	29	1277.00	TQEX
GENMAB A/S	02-Apr-2025	16:03:07 PM	32	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:03:09 PM	53	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:03:09 PM	15	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:03:21 PM	5	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:21 PM	39	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:21 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:21 PM	21	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:21 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:21 PM	10	1277.00	XCSE

178

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:03:21 PM	9	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:03:21 PM	41	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:03:25 PM	11	1276.00	AQEU
GENMAB A/S	02-Apr-2025	16:03:27 PM	19	1276.00	AQEU
GENMAB A/S	02-Apr-2025	16:03:41 PM	39	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:41 PM	14	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:41 PM	15	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:51 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:03:51 PM	10	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:04:19 PM	19	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:19 PM	23	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:52 PM	30	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:52 PM	9	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:52 PM	39	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:52 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:52 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:52 PM	6	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:52 PM	23	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:04:53 PM	7	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:53 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:53 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:53 PM	39	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:53 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:53 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:53 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:04:53 PM	15	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:05:08 PM	10	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:05:08 PM	25	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:05:13 PM	22	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:14 PM	12	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:23 PM	15	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:25 PM	11	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:26 PM	13	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:28 PM	10	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:41 PM	8	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:41 PM	14	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:42 PM	11	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:42 PM	39	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:42 PM	14	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:42 PM	14	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:05:47 PM	19	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:05:47 PM	30	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:05:47 PM	6	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:05:47 PM	49	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:06:27 PM	38	1278.00	XCSE

179

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:06:27 PM	86	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:06:37 PM	52	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:06:37 PM	4	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:06:37 PM	10	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:06:37 PM	9	1277.50	TQEX
GENMAB A/S	02-Apr-2025	16:06:37 PM	21	1277.50	TQEX
GENMAB A/S	02-Apr-2025	16:06:37 PM	33	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:06:37 PM	82	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:07:07 PM	46	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:07:16 PM	12	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:07:17 PM	43	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:07:17 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:07:17 PM	25	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:07:34 PM	22	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:08:25 PM	28	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:08:25 PM	37	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:08:25 PM	36	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:08:31 PM	36	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:08:31 PM	35	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:08:32 PM	86	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:32 PM	13	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:32 PM	39	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:32 PM	13	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:32 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:32 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:32 PM	32	1276.50	TQEX
GENMAB A/S	02-Apr-2025	16:08:32 PM	23	1276.00	AQEU
GENMAB A/S	02-Apr-2025	16:08:32 PM	76	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:08:33 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:33 PM	39	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:33 PM	13	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:33 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:33 PM	31	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:33 PM	15	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:33 PM	68	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:08:33 PM	32	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:08:33 PM	40	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:08:33 PM	19	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:08:56 PM	6	1274.50	AQEU
GENMAB A/S	02-Apr-2025	16:09:04 PM	66	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:04 PM	17	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:04 PM	20	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:04 PM	16	1274.50	AQEU
GENMAB A/S	02-Apr-2025	16:09:04 PM	1	1274.50	AQEU
GENMAB A/S	02-Apr-2025	16:09:04 PM	31	1274.50	CEUX

180

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:09:04 PM	53	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:09:07 PM	81	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:14 PM	49	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:14 PM	37	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:14 PM	35	1274.00	AQEU
GENMAB A/S	02-Apr-2025	16:09:27 PM	39	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:27 PM	43	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:09:27 PM	36	1274.50	TQEX
GENMAB A/S	02-Apr-2025	16:09:27 PM	4	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:09:27 PM	40	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:09:27 PM	63	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:09:27 PM	16	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:10:11 PM	77	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:10:11 PM	9	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:10:23 PM	81	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:10:23 PM	44	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:10:23 PM	40	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:10:23 PM	2	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:10:23 PM	42	1274.00	AQEU
GENMAB A/S	02-Apr-2025	16:10:26 PM	61	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:10:26 PM	19	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:10:48 PM	34	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:10:48 PM	14	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:11:28 PM	12	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:28 PM	48	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:28 PM	47	1274.00	AQEU
GENMAB A/S	02-Apr-2025	16:11:30 PM	30	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:30 PM	12	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:30 PM	48	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:30 PM	13	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:35 PM	4	1273.50	TQEX
GENMAB A/S	02-Apr-2025	16:11:35 PM	19	1273.50	TQEX
GENMAB A/S	02-Apr-2025	16:11:35 PM	53	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:11:41 PM	45	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:41 PM	23	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:11:51 PM	51	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:12:03 PM	49	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:12:03 PM	6	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:12:11 PM	6	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:12:11 PM	48	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:12:11 PM	55	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:12:31 PM	37	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:12:31 PM	28	1273.50	CEUX
GENMAB A/S	02-Apr-2025	16:13:05 PM	15	1274.00	TQEX
GENMAB A/S	02-Apr-2025	16:13:05 PM	46	1274.00	AQEU

181

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:13:14 PM	68	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:13:14 PM	13	1274.00	XCSE
GENMAB A/S	02-Apr-2025	16:13:14 PM	8	1274.00	TQEX
GENMAB A/S	02-Apr-2025	16:13:18 PM	48	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:18 PM	23	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:13:18 PM	1	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:13:28 PM	12	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:28 PM	2	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:28 PM	48	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:28 PM	12	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:28 PM	11	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:28 PM	9	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:28 PM	15	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:13:44 PM	42	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:13:52 PM	23	1276.00	TQEX
GENMAB A/S	02-Apr-2025	16:14:05 PM	30	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:14:05 PM	3	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:14:05 PM	1	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:14:05 PM	13	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:14:16 PM	13	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:16 PM	15	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:16 PM	11	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:16 PM	11	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:16 PM	59	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:20 PM	48	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:20 PM	12	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:20 PM	14	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:20 PM	14	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:24 PM	80	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:14:24 PM	16	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:14:24 PM	52	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:14:34 PM	42	1274.50	AQEU
GENMAB A/S	02-Apr-2025	16:14:56 PM	42	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:56 PM	40	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:56 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:14:56 PM	6	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:15:04 PM	36	1276.00	AQEU
GENMAB A/S	02-Apr-2025	16:15:18 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:15:18 PM	48	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:15:44 PM	38	1276.00	AQEU
GENMAB A/S	02-Apr-2025	16:16:14 PM	41	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:16:14 PM	29	1276.50	TQEX
GENMAB A/S	02-Apr-2025	16:16:24 PM	41	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:16:26 PM	7	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:16:41 PM	79	1277.00	XCSE

182

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:16:42 PM	10	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:44 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:46 PM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:56 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:56 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:56 PM	17	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:56 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:56 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:59 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:16:59 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:17:03 PM	59	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:17:20 PM	17	1277.00	TQEX
GENMAB A/S	02-Apr-2025	16:17:26 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:17:26 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:17:26 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:17:26 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:17:26 PM	53	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:17:26 PM	8	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:17:26 PM	32	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:17:26 PM	35	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:17:26 PM	3	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:17:26 PM	7	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:17:26 PM	7	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:17:44 PM	84	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:17:44 PM	82	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:17:44 PM	5	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:17:44 PM	40	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:17:58 PM	85	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:17:58 PM	25	1278.00	TQEX
GENMAB A/S	02-Apr-2025	16:17:58 PM	35	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:17:58 PM	87	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:18:00 PM	35	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:18:25 PM	80	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:18:25 PM	86	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:18:30 PM	56	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:18:33 PM	19	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:19:05 PM	42	1277.00	TQEX
GENMAB A/S	02-Apr-2025	16:19:05 PM	34	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:19:05 PM	34	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:19:08 PM	33	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:19:11 PM	36	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:19:11 PM	13	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:19:12 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:19:12 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:19:12 PM	13	1277.00	XCSE

183

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:19:12 PM	24	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:19:12 PM	47	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:09 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:20:09 PM	34	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:41 PM	45	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:41 PM	6	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:41 PM	28	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:20:42 PM	48	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	13	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	30	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	13	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:42 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:43 PM	13	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:43 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:43 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:43 PM	49	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:20:52 PM	33	1276.00	AQEU
GENMAB A/S	02-Apr-2025	16:20:52 PM	37	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:21:01 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:21:01 PM	30	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:01 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:01 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:01 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:01 PM	29	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:21 PM	77	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:21 PM	4	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:21 PM	4	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:21:21 PM	19	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:21:21 PM	45	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:21:54 PM	41	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:21:54 PM	29	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:22:00 PM	13	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:22:12 PM	7	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:22:15 PM	9	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:22:26 PM	86	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:22:26 PM	36	1277.00	TQEX
GENMAB A/S	02-Apr-2025	16:22:26 PM	28	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:22:26 PM	29	1276.00	AQEU
GENMAB A/S	02-Apr-2025	16:22:26 PM	80	1277.00	CEUX

184

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:22:30 PM	32	1276.50	AQEU
GENMAB A/S	02-Apr-2025	16:22:32 PM	42	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:22:49 PM	27	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:23:08 PM	80	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:23:08 PM	36	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:23:08 PM	47	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:23:09 PM	33	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:23:21 PM	44	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:23:21 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:23:21 PM	11	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:23:21 PM	86	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:23:21 PM	24	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:23:35 PM	43	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:23:44 PM	29	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:23:44 PM	4	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:24:24 PM	43	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:24:24 PM	36	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:24:49 PM	71	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:24:51 PM	80	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:24:51 PM	17	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:24:51 PM	14	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:24:51 PM	84	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:24:54 PM	23	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:25:05 PM	3	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:05 PM	15	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:05 PM	43	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:25:06 PM	15	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:14 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:14 PM	15	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:14 PM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:14 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:14 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:14 PM	10	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:14 PM	24	1276.50	TQEX
GENMAB A/S	02-Apr-2025	16:25:14 PM	23	1276.50	AQEU
GENMAB A/S	02-Apr-2025	16:25:14 PM	25	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:25:15 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:15 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:25:16 PM	31	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:25:44 PM	31	1277.50	AQEU
GENMAB A/S	02-Apr-2025	16:26:03 PM	82	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:14 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:14 PM	30	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:14 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:14 PM	14	1277.00	XCSE

185

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:26:14 PM	3	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:14 PM	23	1276.50	AQEU
GENMAB A/S	02-Apr-2025	16:26:14 PM	36	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:26:21 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:26:21 PM	48	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:21 PM	12	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:21 PM	12	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:24 PM	87	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:26:24 PM	36	1277.50	TQEX
GENMAB A/S	02-Apr-2025	16:26:24 PM	20	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:26:24 PM	11	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:26:24 PM	36	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:27:02 PM	48	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:02 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:02 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:02 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:14 PM	25	1279.00	AQEU
GENMAB A/S	02-Apr-2025	16:27:14 PM	62	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:27:21 PM	48	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:21 PM	37	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:21 PM	14	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:21 PM	2	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:51 PM	14	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:51 PM	48	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:27:51 PM	34	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:28:24 PM	60	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:28:24 PM	27	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:28:25 PM	15	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:28:25 PM	15	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:28:35 PM	50	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:28:35 PM	24	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:28:42 PM	2	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:29:14 PM	22	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:29:24 PM	36	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:29:24 PM	32	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:29:25 PM	18	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:29:25 PM	28	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:29:25 PM	53	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:29:25 PM	36	1277.50	TQEX
GENMAB A/S	02-Apr-2025	16:29:25 PM	5	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:29:26 PM	13	1277.00	CEUX
GENMAB A/S	02-Apr-2025	16:29:34 PM	23	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:29:34 PM	22	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:29:49 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:29:49 PM	48	1278.50	XCSE

186

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:29:49 PM	9	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:29:57 PM	36	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:29:57 PM	10	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:30:14 PM	41	1278.50	AQEU
GENMAB A/S	02-Apr-2025	16:30:14 PM	2	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:30:22 PM	81	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:30:22 PM	38	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:30:22 PM	12	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:30:22 PM	57	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:30:25 PM	30	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:30:25 PM	48	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:30:25 PM	13	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:30:25 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:30:25 PM	7	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:30:25 PM	14	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:30:25 PM	9	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:30:41 PM	23	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:31:05 PM	85	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:31:05 PM	81	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:31:27 PM	78	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:31:27 PM	31	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:31:27 PM	73	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:31:28 PM	40	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:31:28 PM	26	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:31:28 PM	39	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:31:29 PM	28	1277.00	AQEU
GENMAB A/S	02-Apr-2025	16:31:41 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:31:41 PM	23	1277.50	AQEU
GENMAB A/S	02-Apr-2025	16:31:46 PM	28	1277.00	TQEX
GENMAB A/S	02-Apr-2025	16:31:51 PM	46	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:31:51 PM	46	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:11 PM	26	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:11 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:11 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:11 PM	13	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:11 PM	6	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:20 PM	87	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:20 PM	27	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:20 PM	56	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:20 PM	24	1276.50	AQEU
GENMAB A/S	02-Apr-2025	16:32:20 PM	32	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:32:20 PM	51	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:32:20 PM	45	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:32:20 PM	55	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:32:40 PM	7	1275.50	XCSE

187

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:32:40 PM	7	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:40 PM	8	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:40 PM	2	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:32:47 PM	35	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:32:47 PM	32	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:32:48 PM	24	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:33:15 PM	53	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:33:15 PM	20	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:33:39 PM	20	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:33:41 PM	18	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:33:42 PM	3	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:33:42 PM	5	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:33:53 PM	1	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:33:53 PM	31	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:33:53 PM	32	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:34:25 PM	27	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:34:25 PM	23	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:34:27 PM	28	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:34:40 PM	11	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:34:40 PM	12	1275.50	TQEX
GENMAB A/S	02-Apr-2025	16:34:41 PM	9	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:34:41 PM	53	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:34:50 PM	39	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:34:50 PM	45	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:12 PM	23	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:35:19 PM	12	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:19 PM	26	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:19 PM	35	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:35:19 PM	36	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:35:19 PM	32	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:35:19 PM	19	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:35:20 PM	48	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:20 PM	12	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:20 PM	13	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:20 PM	13	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:20 PM	23	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:20 PM	63	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:20 PM	13	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:44 PM	23	1274.00	AQEU
GENMAB A/S	02-Apr-2025	16:35:44 PM	40	1274.00	CEUX
GENMAB A/S	02-Apr-2025	16:35:54 PM	22	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:54 PM	11	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:54 PM	23	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:54 PM	13	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:54 PM	11	1275.50	XCSE

188

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:35:54 PM	29	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:54 PM	18	1275.00	TQEX
GENMAB A/S	02-Apr-2025	16:35:54 PM	17	1275.00	TQEX
GENMAB A/S	02-Apr-2025	16:35:54 PM	15	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:35:54 PM	23	1275.00	AQEU
GENMAB A/S	02-Apr-2025	16:35:54 PM	43	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:35:54 PM	11	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:35:55 PM	10	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:35:55 PM	75	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:36:11 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:36:11 PM	33	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:36:11 PM	53	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:36:13 PM	33	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:36:14 PM	46	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:36:22 PM	83	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:36:34 PM	23	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:36:44 PM	2	1275.50	AQEU
GENMAB A/S	02-Apr-2025	16:37:27 PM	42	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:37:48 PM	25	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:38:04 PM	32	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:38:11 PM	73	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:38:24 PM	27	1275.00	TQEX
GENMAB A/S	02-Apr-2025	16:38:24 PM	3	1275.00	TQEX
GENMAB A/S	02-Apr-2025	16:38:24 PM	35	1274.50	AQEU
GENMAB A/S	02-Apr-2025	16:38:25 PM	22	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:38:27 PM	9	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:27 PM	16	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:38:35 PM	8	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:38:35 PM	48	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:38:35 PM	12	1274.50	XCSE
GENMAB A/S	02-Apr-2025	16:38:35 PM	30	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:35 PM	15	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:35 PM	4	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:35 PM	40	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:38:35 PM	14	1274.50	CEUX
GENMAB A/S	02-Apr-2025	16:38:36 PM	45	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	44	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	11	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	9	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	4	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	13	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	7	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	18	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	48	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:38:36 PM	12	1275.00	XCSE

189

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:39:08 PM	23	1275.00	TQEX
GENMAB A/S	02-Apr-2025	16:39:08 PM	16	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:39:13 PM	16	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:39:21 PM	38	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:39:21 PM	40	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:40:01 PM	49	1275.00	XCSE
GENMAB A/S	02-Apr-2025	16:40:01 PM	18	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:40:01 PM	17	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:40:01 PM	17	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:40:01 PM	60	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:40:01 PM	40	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:40:01 PM	7	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:40:01 PM	6	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:40:06 PM	20	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:40:11 PM	26	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:40:26 PM	22	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:40:32 PM	11	1275.50	XCSE
GENMAB A/S	02-Apr-2025	16:40:54 PM	38	1275.00	TQEX
GENMAB A/S	02-Apr-2025	16:40:54 PM	44	1275.00	CEUX
GENMAB A/S	02-Apr-2025	16:40:55 PM	34	1275.50	CEUX
GENMAB A/S	02-Apr-2025	16:41:10 PM	6	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	9	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	17	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	10	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	33	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	34	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	12	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	9	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	3	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:10 PM	25	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:41:10 PM	29	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:41:11 PM	10	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	10	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	11	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	12	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	14	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	11	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:12 PM	14	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:13 PM	14	1276.00	XCSE

190

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:41:13 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:13 PM	11	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:13 PM	11	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:14 PM	12	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:14 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:14 PM	13	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:14 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:18 PM	28	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:18 PM	29	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:18 PM	48	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:18 PM	4	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:18 PM	42	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:41:18 PM	9	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:41:18 PM	60	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:41:19 PM	16	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	48	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	11	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	8	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	2	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	13	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	48	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	12	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:19 PM	5	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:41:34 PM	40	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:41:34 PM	29	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:42:03 PM	9	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:42:03 PM	48	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:42:03 PM	12	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:42:05 PM	45	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:42:23 PM	45	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:42:26 PM	41	1276.50	AQEU
GENMAB A/S	02-Apr-2025	16:42:44 PM	14	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:42:44 PM	54	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:42:44 PM	62	1276.00	CEUX
GENMAB A/S	02-Apr-2025	16:43:25 PM	50	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:43:25 PM	6	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:43:26 PM	33	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:43:27 PM	31	1276.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:27 PM	10	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:43:27 PM	25	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:43:27 PM	9	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:43:27 PM	14	1276.50	XCSE

191

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:43:27 PM	48	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:43:27 PM	3	1276.50	XCSE
GENMAB A/S	02-Apr-2025	16:43:27 PM	25	1276.00	TQEX
GENMAB A/S	02-Apr-2025	16:43:29 PM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:29 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:29 PM	11	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:29 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:29 PM	52	1276.50	CEUX
GENMAB A/S	02-Apr-2025	16:43:29 PM	47	1276.50	AQEU
GENMAB A/S	02-Apr-2025	16:43:32 PM	2	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:32 PM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:32 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:32 PM	14	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:33 PM	12	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:33 PM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:33 PM	13	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:33 PM	48	1277.00	XCSE
GENMAB A/S	02-Apr-2025	16:43:36 PM	14	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:43:36 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:43:36 PM	11	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:07 PM	48	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:07 PM	33	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:07 PM	16	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:07 PM	9	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:07 PM	3	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:07 PM	47	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:44:07 PM	29	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:44:07 PM	6	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:44:07 PM	35	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:44:07 PM	6	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:44:08 PM	23	1278.00	TQEX
GENMAB A/S	02-Apr-2025	16:44:08 PM	15	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:44:12 PM	38	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:12 PM	30	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:12 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:12 PM	15	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:12 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:12 PM	4	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:14 PM	43	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:14 PM	12	1279.00	TQEX
GENMAB A/S	02-Apr-2025	16:44:14 PM	3	1279.00	TQEX
GENMAB A/S	02-Apr-2025	16:44:14 PM	10	1279.00	TQEX
GENMAB A/S	02-Apr-2025	16:44:23 PM	43	1279.00	AQEU
GENMAB A/S	02-Apr-2025	16:44:24 PM	4	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:44 PM	16	1280.00	TQEX

192

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:44:44 PM	7	1280.00	TQEX
GENMAB A/S	02-Apr-2025	16:44:44 PM	27	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:44:50 PM	23	1281.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:52 PM	84	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:52 PM	48	1281.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:52 PM	30	1281.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:52 PM	14	1281.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:52 PM	13	1281.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:52 PM	4	1281.00	XCSE
GENMAB A/S	02-Apr-2025	16:44:52 PM	25	1280.00	TQEX
GENMAB A/S	02-Apr-2025	16:44:52 PM	46	1280.50	CEUX
GENMAB A/S	02-Apr-2025	16:44:52 PM	31	1280.00	AQEU
GENMAB A/S	02-Apr-2025	16:44:53 PM	84	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:44:53 PM	45	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:18 PM	23	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:45:18 PM	26	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:45:18 PM	51	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:18 PM	34	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:28 PM	82	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:45:28 PM	37	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:32 PM	14	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:32 PM	24	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:46 PM	2	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:46 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:46 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:46 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:46 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:51 PM	14	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:51 PM	10	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:51 PM	14	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:51 PM	2	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:51 PM	9	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:51 PM	2	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:45:57 PM	23	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:57 PM	6	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:57 PM	7	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:57 PM	2	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:45:57 PM	12	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:46:01 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:01 PM	10	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:06 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:06 PM	13	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:06 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:06 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:11 PM	16	1279.50	XCSE

193

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:46:11 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:11 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:11 PM	6	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:17 PM	50	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:46:17 PM	3	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:46:21 PM	44	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:21 PM	10	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:21 PM	5	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:46:29 PM	15	1279.50	AQEU
GENMAB A/S	02-Apr-2025	16:46:30 PM	34	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:00 PM	50	1281.50	CEUX
GENMAB A/S	02-Apr-2025	16:47:00 PM	40	1281.50	CEUX
GENMAB A/S	02-Apr-2025	16:47:00 PM	19	1281.50	CEUX
GENMAB A/S	02-Apr-2025	16:47:01 PM	14	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	13	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	12	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	56	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	9	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	11	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	11	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	10	1281.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	14	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	29	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:47:03 PM	27	1280.50	TQEX
GENMAB A/S	02-Apr-2025	16:47:03 PM	2	1280.50	TQEX
GENMAB A/S	02-Apr-2025	16:47:03 PM	77	1280.50	CEUX
GENMAB A/S	02-Apr-2025	16:47:03 PM	40	1280.50	AQEU
GENMAB A/S	02-Apr-2025	16:47:03 PM	15	1280.50	AQEU
GENMAB A/S	02-Apr-2025	16:47:03 PM	2	1280.50	AQEU
GENMAB A/S	02-Apr-2025	16:47:03 PM	2	1280.50	AQEU
GENMAB A/S	02-Apr-2025	16:47:03 PM	2	1280.50	AQEU
GENMAB A/S	02-Apr-2025	16:47:05 PM	35	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:47:12 PM	23	1279.50	TQEX
GENMAB A/S	02-Apr-2025	16:47:35 PM	32	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:47:35 PM	15	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:47:35 PM	32	1279.00	AQEU
GENMAB A/S	02-Apr-2025	16:48:05 PM	45	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:12 PM	43	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:48:12 PM	18	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:48:12 PM	37	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:48:12 PM	18	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:12 PM	6	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:12 PM	6	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:12 PM	6	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:12 PM	1	1278.50	CEUX

194

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:48:12 PM	6	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:12 PM	6	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:12 PM	6	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:15 PM	5	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:48:15 PM	35	1278.00	TQEX
GENMAB A/S	02-Apr-2025	16:48:15 PM	31	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:48:15 PM	32	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:48:17 PM	13	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:48:18 PM	13	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:48:18 PM	14	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:48:18 PM	11	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:48:18 PM	48	1278.00	XCSE
GENMAB A/S	02-Apr-2025	16:48:31 PM	31	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:48:40 PM	33	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:48:51 PM	20	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:49:03 PM	27	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:49:03 PM	50	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:49:05 PM	47	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:49:06 PM	7	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:49:06 PM	19	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:49:28 PM	10	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	10	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	12	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	48	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	29	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	52	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	10	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	47	1279.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:28 PM	4	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:49:28 PM	4	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:49:28 PM	50	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:49:28 PM	9	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:49:37 PM	31	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:49:39 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:49:39 PM	48	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:49:40 PM	10	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:49:47 PM	32	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:49:52 PM	31	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:49:52 PM	50	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:49:53 PM	34	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:53 PM	75	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:49:53 PM	24	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:49:54 PM	15	1280.00	AQEU
GENMAB A/S	02-Apr-2025	16:49:55 PM	16	1280.00	AQEU
GENMAB A/S	02-Apr-2025	16:50:05 PM	21	1279.50	XCSE

195

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:50:05 PM	43	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:50:13 PM	109	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:13 PM	35	1280.00	AQEU
GENMAB A/S	02-Apr-2025	16:50:14 PM	10	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:14 PM	10	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:14 PM	48	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:14 PM	14	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:14 PM	12	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:14 PM	14	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:14 PM	1	1280.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:14 PM	27	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:50:17 PM	109	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:50:18 PM	109	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:50:18 PM	40	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:50:20 PM	42	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:50:24 PM	57	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:50:29 PM	26	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:50:31 PM	49	1280.00	XCSE
GENMAB A/S	02-Apr-2025	16:50:34 PM	63	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:50:34 PM	22	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:50:34 PM	22	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:50:46 PM	25	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:51:03 PM	46	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:51:03 PM	7	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:51:03 PM	11	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:51:07 PM	45	1280.00	CEUX
GENMAB A/S	02-Apr-2025	16:51:08 PM	10	1279.50	TQEX
GENMAB A/S	02-Apr-2025	16:51:11 PM	46	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:51:21 PM	31	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:51:21 PM	5	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:51:21 PM	31	1279.50	TQEX
GENMAB A/S	02-Apr-2025	16:51:21 PM	22	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:51:21 PM	17	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:51:24 PM	4	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:51:24 PM	19	1279.50	CEUX
GENMAB A/S	02-Apr-2025	16:51:35 PM	60	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:51:35 PM	4	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:51:35 PM	11	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:51:35 PM	14	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:51:35 PM	40	1279.50	TQEX
GENMAB A/S	02-Apr-2025	16:51:35 PM	24	1279.00	AQEU
GENMAB A/S	02-Apr-2025	16:51:36 PM	12	1279.50	XCSE
GENMAB A/S	02-Apr-2025	16:52:03 PM	9	1279.00	CEUX
GENMAB A/S	02-Apr-2025	16:52:03 PM	2	1279.00	AQEU
GENMAB A/S	02-Apr-2025	16:52:03 PM	2	1279.00	AQEU

196

​

​

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 31 – April 2, 2025

​

​

GENMAB A/S	02-Apr-2025	16:52:11 PM	30	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:52:11 PM	28	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:52:39 PM	50	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:52:45 PM	75	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:52:45 PM	13	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:52:45 PM	11	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:52:45 PM	10	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:52:45 PM	33	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:53:10 PM	14	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:53:10 PM	75	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:53:10 PM	13	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:53:10 PM	7	1278.50	XCSE
GENMAB A/S	02-Apr-2025	16:53:10 PM	3	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:53:10 PM	4	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:53:10 PM	4	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:53:10 PM	15	1278.50	TQEX
GENMAB A/S	02-Apr-2025	16:53:10 PM	50	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:53:10 PM	6	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:53:10 PM	7	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:53:10 PM	15	1278.50	AQEU
GENMAB A/S	02-Apr-2025	16:53:10 PM	2	1278.50	AQEU
GENMAB A/S	02-Apr-2025	16:53:10 PM	2	1278.50	AQEU
GENMAB A/S	02-Apr-2025	16:53:10 PM	2	1278.50	AQEU
GENMAB A/S	02-Apr-2025	16:53:10 PM	15	1278.50	AQEU
GENMAB A/S	02-Apr-2025	16:53:10 PM	2	1278.50	AQEU
GENMAB A/S	02-Apr-2025	16:53:12 PM	23	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:53:14 PM	50	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:53:26 PM	109	1278.50	CEUX
GENMAB A/S	02-Apr-2025	16:53:36 PM	34	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:53:37 PM	25	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:53:44 PM	24	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:53:56 PM	25	1277.50	TQEX
GENMAB A/S	02-Apr-2025	16:54:16 PM	6	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:54:17 PM	23	1277.50	XCSE
GENMAB A/S	02-Apr-2025	16:54:22 PM	16	1277.50	CEUX
GENMAB A/S	02-Apr-2025	16:54:24 PM	50	1278.00	CEUX
GENMAB A/S	02-Apr-2025	16:54:38 PM	15	1278.00	AQEU
GENMAB A/S	02-Apr-2025	16:54:48 PM	48	1277.50	XCSE

​

197

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

Issuer	Date	Time CET	Quantity	Price (DKK)	Venue
GENMAB A/S	03-Apr-2025	09:26:59 AM	71	1281.50	CEUX
GENMAB A/S	03-Apr-2025	09:26:59 AM	8	1281.50	CEUX
GENMAB A/S	03-Apr-2025	09:27:15 AM	21	1282.00	AQEU
GENMAB A/S	03-Apr-2025	09:27:15 AM	55	1282.00	AQEU
GENMAB A/S	03-Apr-2025	09:27:19 AM	19	1281.00	XCSE
GENMAB A/S	03-Apr-2025	09:27:19 AM	29	1281.00	XCSE
GENMAB A/S	03-Apr-2025	09:27:19 AM	76	1281.50	TQEX
GENMAB A/S	03-Apr-2025	09:27:19 AM	72	1281.00	AQEU
GENMAB A/S	03-Apr-2025	09:27:33 AM	27	1281.00	XCSE
GENMAB A/S	03-Apr-2025	09:27:41 AM	46	1280.00	XCSE
GENMAB A/S	03-Apr-2025	09:27:41 AM	24	1280.00	XCSE
GENMAB A/S	03-Apr-2025	09:27:41 AM	80	1280.50	TQEX
GENMAB A/S	03-Apr-2025	09:27:41 AM	78	1280.50	CEUX
GENMAB A/S	03-Apr-2025	09:27:44 AM	57	1279.50	AQEU
GENMAB A/S	03-Apr-2025	09:27:57 AM	4	1280.50	CEUX
GENMAB A/S	03-Apr-2025	09:28:07 AM	20	1281.00	TQEX
GENMAB A/S	03-Apr-2025	09:28:13 AM	52	1281.00	XCSE
GENMAB A/S	03-Apr-2025	09:28:14 AM	4	1281.00	TQEX
GENMAB A/S	03-Apr-2025	09:28:32 AM	65	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:28:32 AM	17	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:28:32 AM	24	1283.50	TQEX
GENMAB A/S	03-Apr-2025	09:28:32 AM	88	1283.50	CEUX
GENMAB A/S	03-Apr-2025	09:29:56 AM	85	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:29:56 AM	17	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:29:56 AM	23	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:29:56 AM	30	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:29:56 AM	30	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:29:56 AM	11	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:29:56 AM	86	1284.50	CEUX
GENMAB A/S	03-Apr-2025	09:29:56 AM	37	1283.50	CEUX
GENMAB A/S	03-Apr-2025	09:30:08 AM	21	1284.50	CEUX
GENMAB A/S	03-Apr-2025	09:31:10 AM	17	1285.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:10 AM	20	1285.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:10 AM	21	1284.50	CEUX
GENMAB A/S	03-Apr-2025	09:31:20 AM	86	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:20 AM	17	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:31:20 AM	19	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:31:20 AM	38	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:20 AM	4	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:20 AM	87	1283.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:20 AM	25	1283.00	TQEX
GENMAB A/S	03-Apr-2025	09:31:20 AM	10	1284.50	CEUX
GENMAB A/S	03-Apr-2025	09:31:20 AM	44	1283.50	CEUX

1

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	09:31:23 AM	56	1283.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:23 AM	29	1283.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:23 AM	25	1283.00	TQEX
GENMAB A/S	03-Apr-2025	09:31:23 AM	68	1282.50	CEUX
GENMAB A/S	03-Apr-2025	09:31:23 AM	19	1282.50	CEUX
GENMAB A/S	03-Apr-2025	09:31:24 AM	26	1282.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:24 AM	13	1282.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:24 AM	44	1282.00	XCSE
GENMAB A/S	03-Apr-2025	09:31:24 AM	25	1282.00	TQEX
GENMAB A/S	03-Apr-2025	09:31:24 AM	25	1282.00	CEUX
GENMAB A/S	03-Apr-2025	09:32:06 AM	34	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:32:14 AM	71	1282.50	XCSE
GENMAB A/S	03-Apr-2025	09:32:14 AM	12	1282.00	CEUX
GENMAB A/S	03-Apr-2025	09:33:32 AM	88	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:33:32 AM	20	1283.50	AQEU
GENMAB A/S	03-Apr-2025	09:33:32 AM	7	1283.50	AQEU
GENMAB A/S	03-Apr-2025	09:34:19 AM	24	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:34:24 AM	83	1282.50	XCSE
GENMAB A/S	03-Apr-2025	09:34:24 AM	28	1282.50	TQEX
GENMAB A/S	03-Apr-2025	09:34:25 AM	14	1282.00	CEUX
GENMAB A/S	03-Apr-2025	09:34:25 AM	33	1282.00	AQEU
GENMAB A/S	03-Apr-2025	09:34:29 AM	40	1281.50	XCSE
GENMAB A/S	03-Apr-2025	09:34:30 AM	4	1281.50	XCSE
GENMAB A/S	03-Apr-2025	09:34:30 AM	11	1281.50	XCSE
GENMAB A/S	03-Apr-2025	09:35:31 AM	24	1284.00	AQEU
GENMAB A/S	03-Apr-2025	09:35:59 AM	4	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:35:59 AM	6	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:35:59 AM	10	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:35:59 AM	30	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:36:05 AM	86	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:36:30 AM	86	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:36:30 AM	26	1284.00	TQEX
GENMAB A/S	03-Apr-2025	09:36:30 AM	86	1284.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:30 AM	74	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:30 AM	38	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:30 AM	14	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:30 AM	2	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:31 AM	85	1282.00	XCSE
GENMAB A/S	03-Apr-2025	09:36:31 AM	15	1282.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:31 AM	33	1282.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:31 AM	16	1282.00	CEUX
GENMAB A/S	03-Apr-2025	09:36:31 AM	8	1282.00	AQEU
GENMAB A/S	03-Apr-2025	09:36:31 AM	18	1282.00	AQEU
GENMAB A/S	03-Apr-2025	09:37:00 AM	18	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:37:00 AM	21	1284.50	XCSE

2

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	09:37:01 AM	18	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:37:12 AM	12	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:37:33 AM	9	1286.50	TQEX
GENMAB A/S	03-Apr-2025	09:37:33 AM	15	1286.50	TQEX
GENMAB A/S	03-Apr-2025	09:37:46 AM	31	1286.00	CEUX
GENMAB A/S	03-Apr-2025	09:38:09 AM	81	1285.50	XCSE
GENMAB A/S	03-Apr-2025	09:38:09 AM	32	1285.00	CEUX
GENMAB A/S	03-Apr-2025	09:38:09 AM	24	1285.50	AQEU
GENMAB A/S	03-Apr-2025	09:38:46 AM	88	1285.50	XCSE
GENMAB A/S	03-Apr-2025	09:38:58 AM	13	1284.50	XCSE
GENMAB A/S	03-Apr-2025	09:39:00 AM	20	1284.00	CEUX
GENMAB A/S	03-Apr-2025	09:39:00 AM	10	1284.00	CEUX
GENMAB A/S	03-Apr-2025	09:39:01 AM	12	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:39:01 AM	75	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:39:01 AM	15	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:39:03 AM	15	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:40:02 AM	88	1282.00	XCSE
GENMAB A/S	03-Apr-2025	09:40:02 AM	24	1281.00	TQEX
GENMAB A/S	03-Apr-2025	09:40:02 AM	27	1281.50	CEUX
GENMAB A/S	03-Apr-2025	09:40:02 AM	24	1281.00	AQEU
GENMAB A/S	03-Apr-2025	09:40:04 AM	47	1280.50	XCSE
GENMAB A/S	03-Apr-2025	09:40:04 AM	34	1280.50	XCSE
GENMAB A/S	03-Apr-2025	09:40:05 AM	24	1280.00	CEUX
GENMAB A/S	03-Apr-2025	09:42:01 AM	86	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:42:01 AM	46	1284.00	CEUX
GENMAB A/S	03-Apr-2025	09:42:07 AM	47	1283.50	TQEX
GENMAB A/S	03-Apr-2025	09:42:37 AM	85	1283.00	XCSE
GENMAB A/S	03-Apr-2025	09:42:37 AM	49	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:42:37 AM	20	1283.00	AQEU
GENMAB A/S	03-Apr-2025	09:44:06 AM	83	1284.00	XCSE
GENMAB A/S	03-Apr-2025	09:44:06 AM	64	1284.00	CEUX
GENMAB A/S	03-Apr-2025	09:45:09 AM	83	1285.00	XCSE
GENMAB A/S	03-Apr-2025	09:45:09 AM	7	1285.00	CEUX
GENMAB A/S	03-Apr-2025	09:45:09 AM	36	1285.00	CEUX
GENMAB A/S	03-Apr-2025	09:45:09 AM	25	1285.00	AQEU
GENMAB A/S	03-Apr-2025	09:46:27 AM	62	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:46:53 AM	28	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:46:53 AM	30	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:46:53 AM	20	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:46:53 AM	33	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:46:54 AM	19	1288.50	TQEX
GENMAB A/S	03-Apr-2025	09:46:54 AM	7	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:46:54 AM	24	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:47:09 AM	13	1288.50	XCSE
GENMAB A/S	03-Apr-2025	09:47:09 AM	30	1288.50	XCSE

3

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	09:47:25 AM	81	1288.00	XCSE
GENMAB A/S	03-Apr-2025	09:47:25 AM	2	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:47:27 AM	11	1287.00	XCSE
GENMAB A/S	03-Apr-2025	09:47:27 AM	49	1287.00	XCSE
GENMAB A/S	03-Apr-2025	09:47:27 AM	28	1287.00	XCSE
GENMAB A/S	03-Apr-2025	09:47:27 AM	53	1287.00	CEUX
GENMAB A/S	03-Apr-2025	09:48:25 AM	39	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:48:28 AM	15	1287.50	AQEU
GENMAB A/S	03-Apr-2025	09:48:32 AM	3	1288.50	XCSE
GENMAB A/S	03-Apr-2025	09:49:02 AM	37	1288.50	XCSE
GENMAB A/S	03-Apr-2025	09:49:02 AM	46	1288.50	XCSE
GENMAB A/S	03-Apr-2025	09:49:02 AM	35	1289.00	CEUX
GENMAB A/S	03-Apr-2025	09:49:05 AM	37	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:49:05 AM	11	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:49:20 AM	26	1287.50	TQEX
GENMAB A/S	03-Apr-2025	09:49:30 AM	15	1287.00	XCSE
GENMAB A/S	03-Apr-2025	09:49:30 AM	73	1287.00	XCSE
GENMAB A/S	03-Apr-2025	09:49:30 AM	24	1287.00	CEUX
GENMAB A/S	03-Apr-2025	09:49:41 AM	27	1287.00	CEUX
GENMAB A/S	03-Apr-2025	09:49:47 AM	20	1286.50	AQEU
GENMAB A/S	03-Apr-2025	09:50:01 AM	37	1286.00	XCSE
GENMAB A/S	03-Apr-2025	09:50:17 AM	45	1286.00	XCSE
GENMAB A/S	03-Apr-2025	09:51:54 AM	83	1286.00	XCSE
GENMAB A/S	03-Apr-2025	09:51:54 AM	31	1286.50	CEUX
GENMAB A/S	03-Apr-2025	09:52:41 AM	8	1286.00	XCSE
GENMAB A/S	03-Apr-2025	09:52:41 AM	18	1286.00	XCSE
GENMAB A/S	03-Apr-2025	09:53:00 AM	83	1285.00	XCSE
GENMAB A/S	03-Apr-2025	09:53:00 AM	27	1285.50	XCSE
GENMAB A/S	03-Apr-2025	09:53:00 AM	24	1285.50	TQEX
GENMAB A/S	03-Apr-2025	09:53:00 AM	24	1285.50	CEUX
GENMAB A/S	03-Apr-2025	09:53:03 AM	24	1284.00	CEUX
GENMAB A/S	03-Apr-2025	09:53:07 AM	28	1284.00	AQEU
GENMAB A/S	03-Apr-2025	09:53:26 AM	84	1283.50	XCSE
GENMAB A/S	03-Apr-2025	09:53:28 AM	29	1283.00	CEUX
GENMAB A/S	03-Apr-2025	09:53:29 AM	20	1282.50	XCSE
GENMAB A/S	03-Apr-2025	09:53:29 AM	62	1282.50	XCSE
GENMAB A/S	03-Apr-2025	09:53:29 AM	20	1282.50	CEUX
GENMAB A/S	03-Apr-2025	09:56:26 AM	81	1285.50	XCSE
GENMAB A/S	03-Apr-2025	09:56:26 AM	33	1285.50	TQEX
GENMAB A/S	03-Apr-2025	09:56:26 AM	43	1285.50	CEUX
GENMAB A/S	03-Apr-2025	09:56:26 AM	21	1285.50	CEUX
GENMAB A/S	03-Apr-2025	09:57:47 AM	44	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:57:47 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:57:47 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:57:47 AM	22	1289.00	XCSE

4

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	09:57:47 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:57:47 AM	11	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:57:47 AM	22	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:58:48 AM	85	1289.00	XCSE
GENMAB A/S	03-Apr-2025	09:58:48 AM	31	1288.00	TQEX
GENMAB A/S	03-Apr-2025	09:58:48 AM	72	1289.00	CEUX
GENMAB A/S	03-Apr-2025	09:58:48 AM	53	1288.00	CEUX
GENMAB A/S	03-Apr-2025	09:58:48 AM	26	1289.00	AQEU
GENMAB A/S	03-Apr-2025	09:58:48 AM	27	1288.00	AQEU
GENMAB A/S	03-Apr-2025	09:58:51 AM	82	1288.00	XCSE
GENMAB A/S	03-Apr-2025	09:59:24 AM	13	1288.00	CEUX
GENMAB A/S	03-Apr-2025	10:00:25 AM	38	1287.50	XCSE
GENMAB A/S	03-Apr-2025	10:00:28 AM	84	1286.50	XCSE
GENMAB A/S	03-Apr-2025	10:00:28 AM	74	1286.50	CEUX
GENMAB A/S	03-Apr-2025	10:02:27 AM	6	1287.50	CEUX
GENMAB A/S	03-Apr-2025	10:02:27 AM	43	1287.50	CEUX
GENMAB A/S	03-Apr-2025	10:02:27 AM	26	1287.50	CEUX
GENMAB A/S	03-Apr-2025	10:02:35 AM	15	1288.00	XCSE
GENMAB A/S	03-Apr-2025	10:03:37 AM	25	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:03:38 AM	45	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:03:38 AM	2	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	86	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	87	1288.50	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	38	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	30	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	7	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	7	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	29	1289.50	XCSE
GENMAB A/S	03-Apr-2025	10:04:24 AM	3	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:04:24 AM	25	1289.00	TQEX
GENMAB A/S	03-Apr-2025	10:04:24 AM	72	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:04:24 AM	69	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:04:24 AM	63	1288.50	CEUX
GENMAB A/S	03-Apr-2025	10:04:24 AM	25	1290.00	AQEU
GENMAB A/S	03-Apr-2025	10:04:24 AM	24	1289.00	AQEU
GENMAB A/S	03-Apr-2025	10:04:25 AM	62	1288.50	XCSE
GENMAB A/S	03-Apr-2025	10:04:25 AM	19	1288.50	XCSE
GENMAB A/S	03-Apr-2025	10:04:25 AM	7	1288.50	CEUX
GENMAB A/S	03-Apr-2025	10:05:16 AM	9	1289.50	XCSE
GENMAB A/S	03-Apr-2025	10:05:35 AM	77	1289.50	XCSE
GENMAB A/S	03-Apr-2025	10:05:35 AM	26	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:05:59 AM	16	1291.00	TQEX
GENMAB A/S	03-Apr-2025	10:05:59 AM	33	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:06:02 AM	61	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:06:58 AM	5	1292.00	XCSE

5

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	10:06:58 AM	29	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:06:58 AM	5	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:07:32 AM	6	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:14 AM	86	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:14 AM	25	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:14 AM	23	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:14 AM	38	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:14 AM	25	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:14 AM	25	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:14 AM	11	1292.00	CEUX
GENMAB A/S	03-Apr-2025	10:08:14 AM	39	1292.00	CEUX
GENMAB A/S	03-Apr-2025	10:08:14 AM	24	1292.00	AQEU
GENMAB A/S	03-Apr-2025	10:08:17 AM	25	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:17 AM	6	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:23 AM	28	1291.00	CEUX
GENMAB A/S	03-Apr-2025	10:08:28 AM	13	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:08:49 AM	8	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:08:51 AM	22	1291.00	TQEX
GENMAB A/S	03-Apr-2025	10:09:21 AM	50	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:09:21 AM	30	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:09:23 AM	25	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:09:29 AM	55	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:09:29 AM	32	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:10:26 AM	86	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:10:26 AM	35	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:10:26 AM	46	1289.50	AQEU
GENMAB A/S	03-Apr-2025	10:11:28 AM	37	1288.50	CEUX
GENMAB A/S	03-Apr-2025	10:12:27 AM	24	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:12:27 AM	18	1290.00	CEUX
GENMAB A/S	03-Apr-2025	10:12:27 AM	36	1290.00	CEUX
GENMAB A/S	03-Apr-2025	10:12:28 AM	12	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:12:28 AM	21	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:12:28 AM	17	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:12:28 AM	7	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:12:41 AM	10	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:12:41 AM	20	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:12:41 AM	51	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:13:58 AM	1	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:14:03 AM	18	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:14:10 AM	86	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:14:10 AM	76	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:14:11 AM	3	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:14:11 AM	28	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:14:15 AM	86	1289.50	XCSE
GENMAB A/S	03-Apr-2025	10:14:15 AM	53	1289.00	CEUX

6

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	10:16:15 AM	24	1291.00	TQEX
GENMAB A/S	03-Apr-2025	10:16:21 AM	14	1291.50	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	18	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	2	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	20	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	10	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	12	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	15	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	11	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	38	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	11	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	4	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:26 AM	4	1292.00	XCSE
GENMAB A/S	03-Apr-2025	10:16:29 AM	86	1291.50	XCSE
GENMAB A/S	03-Apr-2025	10:16:29 AM	11	1291.50	CEUX
GENMAB A/S	03-Apr-2025	10:16:29 AM	26	1291.50	CEUX
GENMAB A/S	03-Apr-2025	10:16:29 AM	27	1291.50	CEUX
GENMAB A/S	03-Apr-2025	10:17:29 AM	24	1291.00	AQEU
GENMAB A/S	03-Apr-2025	10:18:27 AM	87	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:18:27 AM	8	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:18:27 AM	15	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:18:27 AM	60	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:18:27 AM	28	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:18:27 AM	60	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:19:30 AM	32	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:19:30 AM	52	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:20:42 AM	24	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:20:45 AM	5	1290.00	AQEU
GENMAB A/S	03-Apr-2025	10:20:45 AM	1	1290.00	AQEU
GENMAB A/S	03-Apr-2025	10:20:46 AM	14	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:46 AM	15	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:46 AM	46	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:46 AM	15	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:46 AM	18	1290.00	AQEU
GENMAB A/S	03-Apr-2025	10:20:47 AM	10	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:47 AM	17	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:59 AM	24	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:59 AM	15	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:20:59 AM	54	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:22:14 AM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:22:14 AM	2	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:22:14 AM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:22:14 AM	46	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:22:14 AM	15	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:22:14 AM	84	1289.50	XCSE

7

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	10:22:14 AM	24	1289.00	AQEU
GENMAB A/S	03-Apr-2025	10:22:14 AM	49	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:23:13 AM	24	1288.50	TQEX
GENMAB A/S	03-Apr-2025	10:25:02 AM	46	1289.00	AQEU
GENMAB A/S	03-Apr-2025	10:27:53 AM	13	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:27:53 AM	60	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:27:53 AM	50	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:27:53 AM	37	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:27:53 AM	33	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:27:53 AM	78	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:27:53 AM	5	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:30:05 AM	86	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:30:19 AM	23	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:30:19 AM	7	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:30:19 AM	14	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:30:19 AM	38	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:30:19 AM	12	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:30:20 AM	8	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:31:10 AM	10	1291.50	AQEU
GENMAB A/S	03-Apr-2025	10:31:10 AM	7	1291.50	TQEX
GENMAB A/S	03-Apr-2025	10:31:10 AM	20	1291.50	TQEX
GENMAB A/S	03-Apr-2025	10:33:25 AM	20	1291.50	XCSE
GENMAB A/S	03-Apr-2025	10:33:32 AM	87	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:33:32 AM	31	1291.50	AQEU
GENMAB A/S	03-Apr-2025	10:33:32 AM	8	1291.50	TQEX
GENMAB A/S	03-Apr-2025	10:33:32 AM	22	1291.50	TQEX
GENMAB A/S	03-Apr-2025	10:33:32 AM	36	1291.50	CEUX
GENMAB A/S	03-Apr-2025	10:33:32 AM	3	1291.50	CEUX
GENMAB A/S	03-Apr-2025	10:33:32 AM	25	1291.50	CEUX
GENMAB A/S	03-Apr-2025	10:33:32 AM	88	1291.00	CEUX
GENMAB A/S	03-Apr-2025	10:33:37 AM	19	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:34:27 AM	12	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:34:27 AM	81	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:34:27 AM	32	1290.50	CEUX
GENMAB A/S	03-Apr-2025	10:34:54 AM	8	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:34:54 AM	22	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:34:54 AM	26	1290.00	CEUX
GENMAB A/S	03-Apr-2025	10:34:55 AM	14	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:34:55 AM	22	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:34:55 AM	22	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:34:56 AM	23	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:35:40 AM	3	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:36:45 AM	24	1290.00	TQEX
GENMAB A/S	03-Apr-2025	10:36:45 AM	20	1290.00	CEUX
GENMAB A/S	03-Apr-2025	10:36:45 AM	47	1289.50	CEUX

8

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	10:36:45 AM	35	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:38:19 AM	85	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:38:24 AM	9	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:38:24 AM	15	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:38:55 AM	6	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:39:57 AM	15	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:39:57 AM	15	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:40:01 AM	12	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:40:04 AM	21	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:40:04 AM	14	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:40:04 AM	3	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:40:04 AM	3	1290.50	XCSE
GENMAB A/S	03-Apr-2025	10:40:18 AM	27	1290.00	AQEU
GENMAB A/S	03-Apr-2025	10:40:18 AM	36	1290.00	CEUX
GENMAB A/S	03-Apr-2025	10:40:30 AM	15	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:40:30 AM	38	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:40:30 AM	38	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:40:30 AM	11	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:40:30 AM	24	1289.50	TQEX
GENMAB A/S	03-Apr-2025	10:40:30 AM	24	1289.00	AQEU
GENMAB A/S	03-Apr-2025	10:40:30 AM	84	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:40:30 AM	32	1290.00	CEUX
GENMAB A/S	03-Apr-2025	10:40:35 AM	60	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:40:35 AM	14	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:40:35 AM	19	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:40:35 AM	20	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	16	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	38	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	30	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	27	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	20	1288.50	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	10	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	33	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:41 AM	36	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	11	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	38	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	38	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	5	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:42 AM	15	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:45 AM	7	1289.00	XCSE

9

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	10:41:45 AM	15	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:46 AM	35	1288.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:46 AM	47	1288.00	XCSE
GENMAB A/S	03-Apr-2025	10:41:46 AM	34	1288.50	XCSE
GENMAB A/S	03-Apr-2025	10:41:46 AM	32	1288.00	CEUX
GENMAB A/S	03-Apr-2025	10:42:54 AM	14	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:42:54 AM	4	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:42:54 AM	4	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:45:01 AM	12	1289.50	XCSE
GENMAB A/S	03-Apr-2025	10:45:01 AM	59	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:45:01 AM	36	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:45:01 AM	25	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:45:15 AM	7	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:45:15 AM	50	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:45:15 AM	38	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:45:15 AM	14	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:45:15 AM	2	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	12	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	3	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	3	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	12	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	12	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	15	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:46:09 AM	32	1289.50	CEUX
GENMAB A/S	03-Apr-2025	10:46:11 AM	46	1289.00	TQEX
GENMAB A/S	03-Apr-2025	10:46:11 AM	83	1289.00	CEUX
GENMAB A/S	03-Apr-2025	10:46:49 AM	21	1288.50	XCSE
GENMAB A/S	03-Apr-2025	10:46:58 AM	20	1288.50	XCSE
GENMAB A/S	03-Apr-2025	10:47:25 AM	12	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:47:41 AM	8	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:48:33 AM	84	1291.00	XCSE
GENMAB A/S	03-Apr-2025	10:48:33 AM	87	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:48:33 AM	80	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:48:33 AM	8	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:48:33 AM	44	1290.50	TQEX
GENMAB A/S	03-Apr-2025	10:48:33 AM	35	1290.00	AQEU
GENMAB A/S	03-Apr-2025	10:48:33 AM	87	1291.00	CEUX
GENMAB A/S	03-Apr-2025	10:48:33 AM	87	1290.00	CEUX
GENMAB A/S	03-Apr-2025	10:48:33 AM	81	1289.00	CEUX
GENMAB A/S	03-Apr-2025	10:50:49 AM	45	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	8	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	16	1290.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	5	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	38	1289.00	XCSE

10

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	10:50:49 AM	1	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	19	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	17	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	4	1289.00	XCSE
GENMAB A/S	03-Apr-2025	10:50:49 AM	31	1289.50	AQEU
GENMAB A/S	03-Apr-2025	10:50:49 AM	5	1289.00	CEUX
GENMAB A/S	03-Apr-2025	10:50:49 AM	81	1289.00	CEUX
GENMAB A/S	03-Apr-2025	10:52:18 AM	83	1287.50	XCSE
GENMAB A/S	03-Apr-2025	10:52:18 AM	87	1287.50	CEUX
GENMAB A/S	03-Apr-2025	10:52:18 AM	26	1286.50	CEUX
GENMAB A/S	03-Apr-2025	10:52:18 AM	61	1286.50	CEUX
GENMAB A/S	03-Apr-2025	10:52:20 AM	79	1286.00	XCSE
GENMAB A/S	03-Apr-2025	10:52:23 AM	5	1286.00	XCSE
GENMAB A/S	03-Apr-2025	10:52:24 AM	30	1285.50	CEUX
GENMAB A/S	03-Apr-2025	10:53:00 AM	81	1285.00	XCSE
GENMAB A/S	03-Apr-2025	10:53:03 AM	52	1284.00	XCSE
GENMAB A/S	03-Apr-2025	10:53:03 AM	30	1284.00	XCSE
GENMAB A/S	03-Apr-2025	10:53:03 AM	63	1284.00	CEUX
GENMAB A/S	03-Apr-2025	10:53:22 AM	15	1283.00	AQEU
GENMAB A/S	03-Apr-2025	10:54:39 AM	56	1282.50	XCSE
GENMAB A/S	03-Apr-2025	10:55:01 AM	25	1283.00	TQEX
GENMAB A/S	03-Apr-2025	10:55:01 AM	40	1283.00	CEUX
GENMAB A/S	03-Apr-2025	10:55:05 AM	30	1282.50	XCSE
GENMAB A/S	03-Apr-2025	10:57:20 AM	47	1282.50	TQEX
GENMAB A/S	03-Apr-2025	10:57:20 AM	29	1282.50	AQEU
GENMAB A/S	03-Apr-2025	10:58:18 AM	19	1283.00	CEUX
GENMAB A/S	03-Apr-2025	10:59:03 AM	20	1283.00	CEUX
GENMAB A/S	03-Apr-2025	10:59:38 AM	14	1283.00	CEUX
GENMAB A/S	03-Apr-2025	11:00:03 AM	88	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:00:03 AM	50	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:00:03 AM	15	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:00:03 AM	30	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:00:03 AM	12	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:00:04 AM	70	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:00:04 AM	19	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:00:30 AM	19	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:00:44 AM	9	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:03:03 AM	6	1281.00	AQEU
GENMAB A/S	03-Apr-2025	11:03:21 AM	19	1281.00	AQEU
GENMAB A/S	03-Apr-2025	11:04:09 AM	82	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:04:09 AM	2	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:04:09 AM	81	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:05:04 AM	1	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:05:04 AM	45	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:05:05 AM	5	1280.50	XCSE

11

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	11:05:25 AM	50	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:05:25 AM	23	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:05:25 AM	45	1279.50	TQEX
GENMAB A/S	03-Apr-2025	11:05:25 AM	24	1280.00	AQEU
GENMAB A/S	03-Apr-2025	11:05:30 AM	58	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:05:30 AM	10	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:05:33 AM	33	1279.50	CEUX
GENMAB A/S	03-Apr-2025	11:06:01 AM	17	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:06:01 AM	8	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:06:01 AM	11	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:06:10 AM	21	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:06:37 AM	50	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:06:37 AM	61	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:07:09 AM	47	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:07:09 AM	1	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:07:09 AM	27	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:08:09 AM	51	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:08:09 AM	19	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:08:09 AM	42	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:08:09 AM	28	1279.50	CEUX
GENMAB A/S	03-Apr-2025	11:09:04 AM	81	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:09:55 AM	25	1278.00	AQEU
GENMAB A/S	03-Apr-2025	11:10:09 AM	20	1278.00	CEUX
GENMAB A/S	03-Apr-2025	11:10:49 AM	16	1279.00	XCSE
GENMAB A/S	03-Apr-2025	11:10:49 AM	5	1279.00	XCSE
GENMAB A/S	03-Apr-2025	11:10:49 AM	39	1279.00	XCSE
GENMAB A/S	03-Apr-2025	11:10:49 AM	20	1279.00	XCSE
GENMAB A/S	03-Apr-2025	11:12:09 AM	30	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:12:09 AM	50	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:12:09 AM	18	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:12:09 AM	13	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:12:09 AM	25	1278.50	TQEX
GENMAB A/S	03-Apr-2025	11:12:12 AM	16	1278.00	AQEU
GENMAB A/S	03-Apr-2025	11:12:12 AM	3	1278.00	CEUX
GENMAB A/S	03-Apr-2025	11:12:12 AM	26	1278.00	CEUX
GENMAB A/S	03-Apr-2025	11:13:36 AM	1	1278.00	XCSE
GENMAB A/S	03-Apr-2025	11:13:36 AM	46	1278.00	XCSE
GENMAB A/S	03-Apr-2025	11:13:36 AM	15	1278.00	XCSE
GENMAB A/S	03-Apr-2025	11:13:36 AM	22	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:14:45 AM	3	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:15:33 AM	44	1279.00	TQEX
GENMAB A/S	03-Apr-2025	11:15:33 AM	36	1279.50	CEUX
GENMAB A/S	03-Apr-2025	11:15:33 AM	28	1279.00	CEUX
GENMAB A/S	03-Apr-2025	11:15:33 AM	55	1279.00	CEUX
GENMAB A/S	03-Apr-2025	11:15:36 AM	24	1278.50	XCSE

12

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	11:16:43 AM	38	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:16:43 AM	13	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:16:43 AM	39	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:16:43 AM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:16:43 AM	10	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:16:49 AM	21	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:16:49 AM	38	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:16:49 AM	7	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:17:39 AM	1	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:17:39 AM	5	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:17:39 AM	38	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:17:39 AM	39	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:17:39 AM	21	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:17:39 AM	7	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:17:46 AM	32	1279.50	CEUX
GENMAB A/S	03-Apr-2025	11:17:46 AM	45	1279.00	CEUX
GENMAB A/S	03-Apr-2025	11:17:46 AM	43	1279.00	CEUX
GENMAB A/S	03-Apr-2025	11:19:49 AM	61	1278.50	XCSE
GENMAB A/S	03-Apr-2025	11:21:26 AM	14	1280.50	AQEU
GENMAB A/S	03-Apr-2025	11:22:30 AM	36	1281.00	CEUX
GENMAB A/S	03-Apr-2025	11:22:30 AM	15	1281.00	CEUX
GENMAB A/S	03-Apr-2025	11:22:42 AM	18	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:23:39 AM	46	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:23:39 AM	50	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:23:39 AM	15	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:23:39 AM	82	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:23:39 AM	24	1281.00	TQEX
GENMAB A/S	03-Apr-2025	11:23:39 AM	24	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:23:39 AM	83	1281.00	CEUX
GENMAB A/S	03-Apr-2025	11:23:41 AM	16	1280.50	AQEU
GENMAB A/S	03-Apr-2025	11:24:38 AM	24	1280.00	TQEX
GENMAB A/S	03-Apr-2025	11:24:38 AM	26	1280.00	CEUX
GENMAB A/S	03-Apr-2025	11:25:01 AM	29	1280.00	CEUX
GENMAB A/S	03-Apr-2025	11:25:06 AM	21	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:25:06 AM	50	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:25:06 AM	20	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:25:06 AM	20	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:25:06 AM	31	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:25:06 AM	24	1279.50	AQEU
GENMAB A/S	03-Apr-2025	11:25:06 AM	30	1280.00	CEUX
GENMAB A/S	03-Apr-2025	11:25:55 AM	12	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:26:38 AM	27	1279.50	XCSE
GENMAB A/S	03-Apr-2025	11:26:45 AM	47	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:26:45 AM	4	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:26:45 AM	38	1280.00	XCSE

13

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	11:26:45 AM	11	1280.00	XCSE
GENMAB A/S	03-Apr-2025	11:28:21 AM	86	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:28:21 AM	46	1280.50	TQEX
GENMAB A/S	03-Apr-2025	11:28:21 AM	1	1280.50	TQEX
GENMAB A/S	03-Apr-2025	11:28:21 AM	27	1280.50	AQEU
GENMAB A/S	03-Apr-2025	11:28:21 AM	83	1281.00	CEUX
GENMAB A/S	03-Apr-2025	11:28:22 AM	38	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:28:22 AM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:28:22 AM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:28:22 AM	23	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:28:22 AM	46	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:29:59 AM	41	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:30:43 AM	82	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:30:43 AM	27	1280.50	AQEU
GENMAB A/S	03-Apr-2025	11:30:43 AM	70	1280.00	CEUX
GENMAB A/S	03-Apr-2025	11:30:43 AM	11	1280.00	CEUX
GENMAB A/S	03-Apr-2025	11:34:26 AM	2	1281.00	CEUX
GENMAB A/S	03-Apr-2025	11:34:54 AM	27	1281.00	CEUX
GENMAB A/S	03-Apr-2025	11:35:01 AM	23	1281.00	CEUX
GENMAB A/S	03-Apr-2025	11:35:24 AM	19	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:35:27 AM	9	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:35:27 AM	18	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:35:27 AM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:35:27 AM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:35:27 AM	48	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:35:54 AM	7	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:36:06 AM	82	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:36:07 AM	38	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:36:07 AM	40	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:36:07 AM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:36:07 AM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:36:07 AM	13	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:36:38 AM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	3	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	4	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	11	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	83	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	11	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	14	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:02 AM	2	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:37:52 AM	51	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:37:52 AM	29	1280.50	AQEU
GENMAB A/S	03-Apr-2025	11:37:52 AM	66	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:37:53 AM	11	1280.50	XCSE

14

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	11:40:50 AM	5	1283.00	CEUX
GENMAB A/S	03-Apr-2025	11:40:54 AM	34	1282.50	TQEX
GENMAB A/S	03-Apr-2025	11:40:54 AM	81	1282.50	CEUX
GENMAB A/S	03-Apr-2025	11:41:22 AM	5	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:42:49 AM	78	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:42:49 AM	25	1282.00	AQEU
GENMAB A/S	03-Apr-2025	11:43:05 AM	11	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:43:05 AM	40	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:43:05 AM	60	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:43:05 AM	84	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:43:21 AM	28	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:43:21 AM	40	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:43:21 AM	24	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:43:21 AM	17	1282.00	XCSE
GENMAB A/S	03-Apr-2025	11:45:18 AM	47	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:18 AM	13	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:18 AM	13	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:18 AM	2	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:21 AM	83	1282.50	CEUX
GENMAB A/S	03-Apr-2025	11:45:25 AM	25	1282.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:25 AM	11	1282.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:25 AM	38	1282.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:36 AM	85	1282.50	XCSE
GENMAB A/S	03-Apr-2025	11:45:36 AM	28	1282.00	TQEX
GENMAB A/S	03-Apr-2025	11:45:36 AM	24	1282.00	AQEU
GENMAB A/S	03-Apr-2025	11:45:36 AM	48	1282.50	CEUX
GENMAB A/S	03-Apr-2025	11:45:36 AM	37	1282.50	CEUX
GENMAB A/S	03-Apr-2025	11:47:07 AM	87	1281.50	XCSE
GENMAB A/S	03-Apr-2025	11:47:07 AM	87	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:47:21 AM	16	1281.50	TQEX
GENMAB A/S	03-Apr-2025	11:47:21 AM	13	1281.50	TQEX
GENMAB A/S	03-Apr-2025	11:47:21 AM	68	1281.50	CEUX
GENMAB A/S	03-Apr-2025	11:47:23 AM	82	1280.50	XCSE
GENMAB A/S	03-Apr-2025	11:47:23 AM	28	1280.50	AQEU
GENMAB A/S	03-Apr-2025	11:47:23 AM	82	1280.50	CEUX
GENMAB A/S	03-Apr-2025	11:49:00 AM	20	1282.50	XCSE
GENMAB A/S	03-Apr-2025	11:49:00 AM	15	1282.50	XCSE
GENMAB A/S	03-Apr-2025	11:49:00 AM	8	1282.50	XCSE
GENMAB A/S	03-Apr-2025	11:50:02 AM	88	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:50:02 AM	45	1284.00	TQEX
GENMAB A/S	03-Apr-2025	11:50:02 AM	50	1284.00	CEUX
GENMAB A/S	03-Apr-2025	11:52:39 AM	47	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:53:08 AM	70	1284.00	CEUX
GENMAB A/S	03-Apr-2025	11:53:25 AM	19	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:53:26 AM	14	1284.50	XCSE

15

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	11:53:31 AM	11	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:54:09 AM	40	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:54:09 AM	9	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:54:09 AM	9	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:54:09 AM	47	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:54:09 AM	6	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:54:39 AM	21	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:54:39 AM	14	1284.50	XCSE
GENMAB A/S	03-Apr-2025	11:57:08 AM	12	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:57:16 AM	45	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:57:23 AM	3	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:57:44 AM	10	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:57:44 AM	16	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:57:44 AM	25	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:57:44 AM	83	1283.50	XCSE
GENMAB A/S	03-Apr-2025	11:57:44 AM	24	1283.50	AQEU
GENMAB A/S	03-Apr-2025	11:58:40 AM	81	1283.50	XCSE
GENMAB A/S	03-Apr-2025	11:58:40 AM	24	1283.50	TQEX
GENMAB A/S	03-Apr-2025	11:58:40 AM	27	1283.50	AQEU
GENMAB A/S	03-Apr-2025	11:59:26 AM	26	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:59:26 AM	12	1284.00	XCSE
GENMAB A/S	03-Apr-2025	11:59:44 AM	48	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:01:10 PM	82	1284.50	XCSE
GENMAB A/S	03-Apr-2025	12:01:10 PM	81	1284.50	CEUX
GENMAB A/S	03-Apr-2025	12:02:27 PM	84	1283.50	XCSE
GENMAB A/S	03-Apr-2025	12:02:28 PM	55	1283.00	CEUX
GENMAB A/S	03-Apr-2025	12:03:36 PM	47	1283.00	TQEX
GENMAB A/S	03-Apr-2025	12:03:36 PM	87	1283.00	CEUX
GENMAB A/S	03-Apr-2025	12:04:27 PM	5	1283.00	XCSE
GENMAB A/S	03-Apr-2025	12:05:24 PM	22	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:05:26 PM	22	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:05:28 PM	18	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:05:28 PM	18	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:05:28 PM	60	1283.50	XCSE
GENMAB A/S	03-Apr-2025	12:05:57 PM	18	1283.50	XCSE
GENMAB A/S	03-Apr-2025	12:05:57 PM	8	1283.50	XCSE
GENMAB A/S	03-Apr-2025	12:07:28 PM	8	1283.50	XCSE
GENMAB A/S	03-Apr-2025	12:08:26 PM	8	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:08:37 PM	85	1283.50	XCSE
GENMAB A/S	03-Apr-2025	12:08:37 PM	37	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:08:37 PM	15	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:08:37 PM	12	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:08:37 PM	11	1284.00	XCSE
GENMAB A/S	03-Apr-2025	12:09:43 PM	32	1283.00	AQEU
GENMAB A/S	03-Apr-2025	12:09:43 PM	85	1283.00	CEUX

16

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	12:10:16 PM	26	1283.00	XCSE
GENMAB A/S	03-Apr-2025	12:10:16 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	12:11:29 PM	13	1282.50	XCSE
GENMAB A/S	03-Apr-2025	12:11:29 PM	10	1282.50	XCSE
GENMAB A/S	03-Apr-2025	12:11:51 PM	83	1282.50	XCSE
GENMAB A/S	03-Apr-2025	12:12:03 PM	33	1282.00	AQEU
GENMAB A/S	03-Apr-2025	12:12:03 PM	39	1282.00	CEUX
GENMAB A/S	03-Apr-2025	12:12:34 PM	86	1281.00	XCSE
GENMAB A/S	03-Apr-2025	12:12:34 PM	88	1281.00	CEUX
GENMAB A/S	03-Apr-2025	12:13:01 PM	86	1280.00	XCSE
GENMAB A/S	03-Apr-2025	12:13:03 PM	85	1279.50	CEUX
GENMAB A/S	03-Apr-2025	12:13:41 PM	25	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:15:01 PM	73	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:15:01 PM	8	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:15:01 PM	37	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:15:01 PM	20	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:17:01 PM	14	1282.00	TQEX
GENMAB A/S	03-Apr-2025	12:17:01 PM	21	1282.00	TQEX
GENMAB A/S	03-Apr-2025	12:18:01 PM	85	1281.50	XCSE
GENMAB A/S	03-Apr-2025	12:18:01 PM	37	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:18:01 PM	50	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:18:01 PM	34	1281.00	TQEX
GENMAB A/S	03-Apr-2025	12:18:01 PM	45	1281.50	AQEU
GENMAB A/S	03-Apr-2025	12:18:01 PM	60	1281.00	CEUX
GENMAB A/S	03-Apr-2025	12:18:41 PM	85	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:18:41 PM	44	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:18:44 PM	87	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:18:47 PM	50	1279.00	CEUX
GENMAB A/S	03-Apr-2025	12:19:33 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:19:33 PM	31	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:23:36 PM	87	1282.50	XCSE
GENMAB A/S	03-Apr-2025	12:23:36 PM	43	1282.50	CEUX
GENMAB A/S	03-Apr-2025	12:23:36 PM	22	1282.50	CEUX
GENMAB A/S	03-Apr-2025	12:23:58 PM	46	1282.50	CEUX
GENMAB A/S	03-Apr-2025	12:27:51 PM	37	1282.00	XCSE
GENMAB A/S	03-Apr-2025	12:27:51 PM	35	1282.00	XCSE
GENMAB A/S	03-Apr-2025	12:27:51 PM	15	1282.50	XCSE
GENMAB A/S	03-Apr-2025	12:27:51 PM	24	1282.50	XCSE
GENMAB A/S	03-Apr-2025	12:27:51 PM	87	1281.50	XCSE
GENMAB A/S	03-Apr-2025	12:27:51 PM	55	1281.50	CEUX
GENMAB A/S	03-Apr-2025	12:27:51 PM	7	1281.50	CEUX
GENMAB A/S	03-Apr-2025	12:29:59 PM	45	1281.50	XCSE
GENMAB A/S	03-Apr-2025	12:29:59 PM	3	1281.50	XCSE
GENMAB A/S	03-Apr-2025	12:29:59 PM	17	1281.50	XCSE
GENMAB A/S	03-Apr-2025	12:29:59 PM	23	1281.50	XCSE

17

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	12:30:00 PM	24	1281.00	AQEU
GENMAB A/S	03-Apr-2025	12:31:26 PM	81	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:31:26 PM	33	1280.50	TQEX
GENMAB A/S	03-Apr-2025	12:33:27 PM	39	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:33:27 PM	1	1280.00	AQEU
GENMAB A/S	03-Apr-2025	12:33:27 PM	1	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:33:27 PM	1	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:33:27 PM	1	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:34:28 PM	16	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:35:26 PM	16	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:35:26 PM	50	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:35:26 PM	45	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:36:06 PM	85	1280.50	XCSE
GENMAB A/S	03-Apr-2025	12:36:06 PM	25	1280.50	TQEX
GENMAB A/S	03-Apr-2025	12:36:06 PM	33	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:36:26 PM	85	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:37:18 PM	31	1279.00	AQEU
GENMAB A/S	03-Apr-2025	12:37:18 PM	27	1279.00	CEUX
GENMAB A/S	03-Apr-2025	12:37:33 PM	81	1278.00	XCSE
GENMAB A/S	03-Apr-2025	12:37:33 PM	39	1278.00	CEUX
GENMAB A/S	03-Apr-2025	12:40:49 PM	14	1278.00	XCSE
GENMAB A/S	03-Apr-2025	12:40:49 PM	5	1278.00	XCSE
GENMAB A/S	03-Apr-2025	12:40:49 PM	44	1278.00	XCSE
GENMAB A/S	03-Apr-2025	12:40:49 PM	24	1278.00	XCSE
GENMAB A/S	03-Apr-2025	12:42:20 PM	8	1278.00	XCSE
GENMAB A/S	03-Apr-2025	12:43:30 PM	16	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:43:31 PM	15	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:43:31 PM	3	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:43:31 PM	42	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:43:33 PM	19	1279.00	XCSE
GENMAB A/S	03-Apr-2025	12:43:33 PM	12	1279.00	XCSE
GENMAB A/S	03-Apr-2025	12:43:33 PM	44	1279.00	XCSE
GENMAB A/S	03-Apr-2025	12:43:33 PM	4	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:43:50 PM	1	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:43:59 PM	1	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:43:59 PM	42	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:44:39 PM	16	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:44:39 PM	4	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:44:39 PM	37	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:46:29 PM	23	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:46:29 PM	11	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:46:30 PM	41	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:48:19 PM	27	1279.00	AQEU
GENMAB A/S	03-Apr-2025	12:48:19 PM	24	1279.00	CEUX
GENMAB A/S	03-Apr-2025	12:48:32 PM	34	1279.00	XCSE

18

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	12:48:32 PM	22	1279.00	XCSE
GENMAB A/S	03-Apr-2025	12:49:58 PM	32	1279.50	CEUX
GENMAB A/S	03-Apr-2025	12:49:59 PM	35	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:49:59 PM	15	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:49:59 PM	39	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:49:59 PM	17	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:50:25 PM	12	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:51:01 PM	111	1280.00	XCSE
GENMAB A/S	03-Apr-2025	12:51:01 PM	82	1279.00	XCSE
GENMAB A/S	03-Apr-2025	12:51:01 PM	34	1279.50	TQEX
GENMAB A/S	03-Apr-2025	12:51:01 PM	25	1279.00	AQEU
GENMAB A/S	03-Apr-2025	12:51:01 PM	79	1280.00	CEUX
GENMAB A/S	03-Apr-2025	12:51:01 PM	82	1279.50	CEUX
GENMAB A/S	03-Apr-2025	12:51:56 PM	31	1278.50	TQEX
GENMAB A/S	03-Apr-2025	12:51:56 PM	41	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:51:56 PM	45	1278.50	CEUX
GENMAB A/S	03-Apr-2025	12:52:07 PM	73	1278.00	XCSE
GENMAB A/S	03-Apr-2025	12:52:07 PM	28	1278.00	AQEU
GENMAB A/S	03-Apr-2025	12:52:26 PM	28	1277.50	TQEX
GENMAB A/S	03-Apr-2025	12:52:26 PM	83	1277.50	CEUX
GENMAB A/S	03-Apr-2025	12:55:26 PM	5	1278.50	XCSE
GENMAB A/S	03-Apr-2025	12:56:31 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:56:42 PM	12	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:56:44 PM	12	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:56:44 PM	17	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:56:48 PM	10	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	45	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	39	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	27	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	45	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	17	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	2	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	2	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	39	1279.50	XCSE
GENMAB A/S	03-Apr-2025	12:59:03 PM	6	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:39 PM	10	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:46 PM	10	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:48 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:51 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:51 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:59 PM	2	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:59 PM	2	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:00:59 PM	39	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:01:19 PM	10	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:01:19 PM	4	1279.50	XCSE

19

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	13:01:19 PM	18	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:01:49 PM	4	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:01:49 PM	26	1279.50	XCSE
GENMAB A/S	03-Apr-2025	13:02:05 PM	5	1278.50	TQEX
GENMAB A/S	03-Apr-2025	13:02:05 PM	26	1278.50	AQEU
GENMAB A/S	03-Apr-2025	13:02:19 PM	13	1279.00	XCSE
GENMAB A/S	03-Apr-2025	13:02:19 PM	7	1279.00	XCSE
GENMAB A/S	03-Apr-2025	13:06:01 PM	85	1278.50	XCSE
GENMAB A/S	03-Apr-2025	13:06:01 PM	75	1278.50	XCSE
GENMAB A/S	03-Apr-2025	13:06:01 PM	36	1278.50	XCSE
GENMAB A/S	03-Apr-2025	13:06:01 PM	20	1278.50	TQEX
GENMAB A/S	03-Apr-2025	13:06:01 PM	24	1278.00	TQEX
GENMAB A/S	03-Apr-2025	13:06:01 PM	84	1278.50	CEUX
GENMAB A/S	03-Apr-2025	13:06:01 PM	32	1278.50	CEUX
GENMAB A/S	03-Apr-2025	13:06:06 PM	83	1277.50	XCSE
GENMAB A/S	03-Apr-2025	13:06:06 PM	39	1278.00	XCSE
GENMAB A/S	03-Apr-2025	13:06:06 PM	24	1277.50	AQEU
GENMAB A/S	03-Apr-2025	13:06:06 PM	59	1277.50	CEUX
GENMAB A/S	03-Apr-2025	13:07:03 PM	6	1277.50	XCSE
GENMAB A/S	03-Apr-2025	13:07:08 PM	79	1277.50	XCSE
GENMAB A/S	03-Apr-2025	13:07:11 PM	88	1278.50	XCSE
GENMAB A/S	03-Apr-2025	13:07:11 PM	87	1277.50	XCSE
GENMAB A/S	03-Apr-2025	13:07:11 PM	28	1278.00	TQEX
GENMAB A/S	03-Apr-2025	13:07:11 PM	55	1278.50	CEUX
GENMAB A/S	03-Apr-2025	13:07:11 PM	29	1278.50	CEUX
GENMAB A/S	03-Apr-2025	13:08:15 PM	35	1278.50	XCSE
GENMAB A/S	03-Apr-2025	13:08:23 PM	36	1278.50	XCSE
GENMAB A/S	03-Apr-2025	13:11:15 PM	24	1278.00	CEUX
GENMAB A/S	03-Apr-2025	13:12:03 PM	59	1277.50	XCSE
GENMAB A/S	03-Apr-2025	13:12:03 PM	85	1277.50	CEUX
GENMAB A/S	03-Apr-2025	13:13:27 PM	25	1277.00	TQEX
GENMAB A/S	03-Apr-2025	13:13:27 PM	36	1277.00	AQEU
GENMAB A/S	03-Apr-2025	13:13:45 PM	82	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:15:05 PM	22	1277.00	CEUX
GENMAB A/S	03-Apr-2025	13:15:05 PM	1	1277.00	CEUX
GENMAB A/S	03-Apr-2025	13:15:05 PM	1	1277.00	CEUX
GENMAB A/S	03-Apr-2025	13:15:45 PM	81	1278.00	XCSE
GENMAB A/S	03-Apr-2025	13:15:45 PM	32	1278.50	TQEX
GENMAB A/S	03-Apr-2025	13:15:45 PM	27	1278.00	AQEU
GENMAB A/S	03-Apr-2025	13:15:45 PM	82	1278.00	CEUX
GENMAB A/S	03-Apr-2025	13:16:07 PM	82	1278.00	XCSE
GENMAB A/S	03-Apr-2025	13:16:07 PM	88	1278.00	CEUX
GENMAB A/S	03-Apr-2025	13:16:10 PM	51	1277.00	XCSE
GENMAB A/S	03-Apr-2025	13:16:31 PM	37	1277.00	XCSE
GENMAB A/S	03-Apr-2025	13:16:31 PM	81	1277.00	CEUX

20

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	13:17:46 PM	5	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:17:46 PM	78	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:20:08 PM	13	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:20:08 PM	1	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:20:08 PM	4	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:20:08 PM	30	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:20:22 PM	27	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:21:52 PM	45	1277.00	XCSE
GENMAB A/S	03-Apr-2025	13:21:52 PM	31	1277.00	TQEX
GENMAB A/S	03-Apr-2025	13:21:52 PM	81	1277.00	CEUX
GENMAB A/S	03-Apr-2025	13:21:55 PM	16	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:21:55 PM	38	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:21:55 PM	25	1276.50	AQEU
GENMAB A/S	03-Apr-2025	13:21:58 PM	61	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:21:58 PM	20	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:24:56 PM	28	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:24:56 PM	20	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:24:56 PM	28	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:24:56 PM	19	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:24:56 PM	5	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:26:25 PM	13	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:26:45 PM	72	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:26:45 PM	16	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:27:25 PM	1	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:27:36 PM	25	1276.00	TQEX
GENMAB A/S	03-Apr-2025	13:27:36 PM	77	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:27:39 PM	4	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:30:28 PM	1	1275.50	AQEU
GENMAB A/S	03-Apr-2025	13:30:28 PM	1	1275.50	AQEU
GENMAB A/S	03-Apr-2025	13:30:29 PM	1	1275.50	AQEU
GENMAB A/S	03-Apr-2025	13:30:47 PM	38	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:31:42 PM	69	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:31:42 PM	20	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:31:42 PM	84	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:31:50 PM	26	1275.50	TQEX
GENMAB A/S	03-Apr-2025	13:31:50 PM	21	1275.50	AQEU
GENMAB A/S	03-Apr-2025	13:31:51 PM	4	1276.00	XCSE
GENMAB A/S	03-Apr-2025	13:32:08 PM	47	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:32:08 PM	4	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:32:08 PM	21	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:32:08 PM	2	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:32:42 PM	22	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:32:42 PM	62	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:32:42 PM	24	1275.50	AQEU
GENMAB A/S	03-Apr-2025	13:32:42 PM	74	1275.50	CEUX

21

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	13:34:26 PM	88	1274.50	XCSE
GENMAB A/S	03-Apr-2025	13:34:26 PM	44	1273.50	TQEX
GENMAB A/S	03-Apr-2025	13:34:26 PM	25	1274.50	AQEU
GENMAB A/S	03-Apr-2025	13:34:26 PM	81	1274.50	CEUX
GENMAB A/S	03-Apr-2025	13:34:26 PM	46	1273.50	CEUX
GENMAB A/S	03-Apr-2025	13:34:52 PM	34	1273.00	XCSE
GENMAB A/S	03-Apr-2025	13:34:52 PM	53	1273.00	XCSE
GENMAB A/S	03-Apr-2025	13:36:09 PM	77	1273.00	XCSE
GENMAB A/S	03-Apr-2025	13:36:09 PM	9	1273.00	XCSE
GENMAB A/S	03-Apr-2025	13:36:09 PM	43	1273.00	CEUX
GENMAB A/S	03-Apr-2025	13:37:25 PM	82	1273.00	XCSE
GENMAB A/S	03-Apr-2025	13:37:25 PM	27	1273.00	CEUX
GENMAB A/S	03-Apr-2025	13:40:26 PM	6	1273.50	XCSE
GENMAB A/S	03-Apr-2025	13:41:40 PM	84	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:42:07 PM	47	1274.50	XCSE
GENMAB A/S	03-Apr-2025	13:42:07 PM	40	1274.50	XCSE
GENMAB A/S	03-Apr-2025	13:42:07 PM	20	1274.50	CEUX
GENMAB A/S	03-Apr-2025	13:42:07 PM	42	1274.50	CEUX
GENMAB A/S	03-Apr-2025	13:43:26 PM	37	1274.50	XCSE
GENMAB A/S	03-Apr-2025	13:43:26 PM	23	1274.50	XCSE
GENMAB A/S	03-Apr-2025	13:43:27 PM	23	1274.50	XCSE
GENMAB A/S	03-Apr-2025	13:43:41 PM	25	1274.00	XCSE
GENMAB A/S	03-Apr-2025	13:43:41 PM	61	1274.00	XCSE
GENMAB A/S	03-Apr-2025	13:46:04 PM	1	1273.00	XCSE
GENMAB A/S	03-Apr-2025	13:46:05 PM	17	1273.00	AQEU
GENMAB A/S	03-Apr-2025	13:47:12 PM	10	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	11	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	12	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	16	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	10	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	10	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	10	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	9	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	15	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	10	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	23	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	10	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:47:13 PM	16	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:48:27 PM	14	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:48:29 PM	5	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	44	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	6	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	6	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	27	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	27	1275.50	XCSE

22

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	13:50:58 PM	1	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	38	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	68	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:50:58 PM	5	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:51:05 PM	9	1275.50	XCSE
GENMAB A/S	03-Apr-2025	13:52:15 PM	81	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:52:15 PM	47	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:52:15 PM	19	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:52:15 PM	35	1275.00	AQEU
GENMAB A/S	03-Apr-2025	13:52:15 PM	32	1275.00	CEUX
GENMAB A/S	03-Apr-2025	13:53:26 PM	29	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:53:26 PM	26	1275.00	CEUX
GENMAB A/S	03-Apr-2025	13:53:26 PM	68	1274.50	CEUX
GENMAB A/S	03-Apr-2025	13:53:26 PM	17	1274.50	CEUX
GENMAB A/S	03-Apr-2025	13:53:27 PM	88	1274.00	XCSE
GENMAB A/S	03-Apr-2025	13:54:03 PM	24	1274.00	AQEU
GENMAB A/S	03-Apr-2025	13:54:29 PM	24	1273.50	TQEX
GENMAB A/S	03-Apr-2025	13:55:26 PM	60	1273.50	XCSE
GENMAB A/S	03-Apr-2025	13:55:26 PM	67	1273.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:03 PM	1	1274.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:10 PM	11	1275.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:10 PM	11	1275.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:17 PM	7	1275.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:19 PM	14	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:19 PM	5	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:19 PM	5	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:49 PM	53	1278.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:49 PM	31	1278.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:49 PM	58	1278.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:49 PM	28	1278.00	XCSE
GENMAB A/S	03-Apr-2025	13:56:49 PM	36	1278.00	TQEX
GENMAB A/S	03-Apr-2025	13:56:49 PM	27	1278.00	TQEX
GENMAB A/S	03-Apr-2025	13:56:49 PM	8	1277.50	AQEU
GENMAB A/S	03-Apr-2025	13:56:49 PM	7	1277.50	AQEU
GENMAB A/S	03-Apr-2025	13:56:49 PM	2	1277.50	AQEU
GENMAB A/S	03-Apr-2025	13:56:49 PM	4	1277.50	AQEU
GENMAB A/S	03-Apr-2025	13:56:49 PM	75	1278.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:49 PM	8	1278.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:52 PM	87	1276.50	XCSE
GENMAB A/S	03-Apr-2025	13:56:52 PM	38	1277.00	TQEX
GENMAB A/S	03-Apr-2025	13:56:52 PM	61	1277.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:52 PM	23	1277.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:55 PM	42	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:56:55 PM	40	1276.00	CEUX
GENMAB A/S	03-Apr-2025	13:58:20 PM	55	1275.00	XCSE

23

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	13:58:20 PM	12	1275.00	XCSE
GENMAB A/S	03-Apr-2025	13:58:20 PM	14	1275.00	XCSE
GENMAB A/S	03-Apr-2025	14:01:10 PM	85	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:03:15 PM	7	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:03:15 PM	9	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:03:15 PM	9	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:03:16 PM	26	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:03:16 PM	20	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:03:16 PM	26	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:03:16 PM	27	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:03:17 PM	22	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:03:25 PM	11	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:26 PM	11	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:04:27 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:27 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:27 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:27 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:27 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:27 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:27 PM	4	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:04:58 PM	9	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:04:58 PM	102	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:04:58 PM	9	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:04:58 PM	12	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:04:58 PM	24	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:05:15 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:05:15 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:05:15 PM	4	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:05:19 PM	9	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:05:19 PM	9	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:05:19 PM	36	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:06:21 PM	87	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:06:21 PM	27	1277.00	AQEU
GENMAB A/S	03-Apr-2025	14:06:21 PM	81	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:06:51 PM	12	1276.50	TQEX
GENMAB A/S	03-Apr-2025	14:07:45 PM	11	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:08:27 PM	17	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:08:43 PM	31	1278.00	TQEX
GENMAB A/S	03-Apr-2025	14:08:43 PM	29	1278.00	TQEX
GENMAB A/S	03-Apr-2025	14:08:43 PM	8	1278.00	AQEU
GENMAB A/S	03-Apr-2025	14:08:43 PM	29	1278.00	AQEU
GENMAB A/S	03-Apr-2025	14:08:43 PM	6	1278.50	CEUX
GENMAB A/S	03-Apr-2025	14:08:43 PM	6	1278.50	CEUX
GENMAB A/S	03-Apr-2025	14:08:43 PM	8	1278.50	CEUX
GENMAB A/S	03-Apr-2025	14:08:46 PM	83	1277.50	XCSE

24

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	14:08:46 PM	2	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:08:48 PM	87	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:09:00 PM	51	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:09:00 PM	33	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:09:00 PM	27	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:09:00 PM	15	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:09:00 PM	35	1278.00	AQEU
GENMAB A/S	03-Apr-2025	14:09:00 PM	83	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:09:20 PM	52	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:09:49 PM	21	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:10:10 PM	85	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:10:13 PM	26	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:10:52 PM	9	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:11:29 PM	9	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:12:25 PM	9	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:13:26 PM	17	1277.00	TQEX
GENMAB A/S	03-Apr-2025	14:13:26 PM	10	1277.00	TQEX
GENMAB A/S	03-Apr-2025	14:13:36 PM	17	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:13:36 PM	15	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:13:37 PM	16	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:13:37 PM	95	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:13:37 PM	16	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:13:37 PM	22	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:13:37 PM	16	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:13:37 PM	57	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:13:39 PM	23	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:14:18 PM	31	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:14:18 PM	49	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:14:18 PM	36	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:14:49 PM	10	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:18:56 PM	9	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:18:56 PM	53	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:18:56 PM	58	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:18:56 PM	21	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:18:56 PM	4	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:18:56 PM	22	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:18:56 PM	20	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:18:56 PM	24	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:18:56 PM	10	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:18:56 PM	9	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:18:57 PM	18	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:18:57 PM	6	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:18:57 PM	87	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:18:57 PM	18	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:18:57 PM	78	1278.00	XCSE

25

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	14:18:57 PM	31	1278.00	AQEU
GENMAB A/S	03-Apr-2025	14:18:58 PM	61	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:19:29 PM	68	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:19:29 PM	1	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:19:36 PM	17	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:19:36 PM	64	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:19:44 PM	24	1277.50	TQEX
GENMAB A/S	03-Apr-2025	14:19:44 PM	8	1277.00	AQEU
GENMAB A/S	03-Apr-2025	14:19:44 PM	87	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:20:43 PM	21	1277.00	AQEU
GENMAB A/S	03-Apr-2025	14:20:46 PM	28	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:22:38 PM	38	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:22:38 PM	1	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:22:38 PM	5	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:22:38 PM	50	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:22:38 PM	8	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:22:59 PM	16	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:23:26 PM	27	1277.00	TQEX
GENMAB A/S	03-Apr-2025	14:23:26 PM	1	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:23:45 PM	2	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:23:45 PM	9	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:23:45 PM	42	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:23:45 PM	16	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:23:45 PM	34	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:23:46 PM	12	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:23:46 PM	15	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:24:08 PM	70	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:24:08 PM	41	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:24:29 PM	64	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:24:29 PM	26	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:24:29 PM	27	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:24:29 PM	9	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:24:29 PM	84	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:24:46 PM	82	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:24:46 PM	26	1277.50	TQEX
GENMAB A/S	03-Apr-2025	14:24:46 PM	26	1277.50	AQEU
GENMAB A/S	03-Apr-2025	14:24:46 PM	86	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:28:19 PM	60	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:28:28 PM	12	1276.50	AQEU
GENMAB A/S	03-Apr-2025	14:29:23 PM	22	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:29:23 PM	33	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:29:23 PM	21	1276.50	AQEU
GENMAB A/S	03-Apr-2025	14:29:23 PM	6	1276.00	CEUX
GENMAB A/S	03-Apr-2025	14:29:27 PM	8	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:30:26 PM	12	1276.50	XCSE

26

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	14:30:26 PM	24	1276.50	CEUX
GENMAB A/S	03-Apr-2025	14:31:02 PM	27	1276.00	TQEX
GENMAB A/S	03-Apr-2025	14:31:02 PM	62	1276.00	CEUX
GENMAB A/S	03-Apr-2025	14:31:02 PM	17	1276.00	CEUX
GENMAB A/S	03-Apr-2025	14:31:39 PM	83	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:31:39 PM	2	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:31:39 PM	2	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:31:39 PM	27	1275.50	AQEU
GENMAB A/S	03-Apr-2025	14:32:14 PM	32	1276.00	TQEX
GENMAB A/S	03-Apr-2025	14:32:25 PM	10	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:32:25 PM	74	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:32:25 PM	30	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:32:25 PM	44	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:32:25 PM	37	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:32:25 PM	81	1275.50	CEUX
GENMAB A/S	03-Apr-2025	14:32:26 PM	2	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:32:26 PM	46	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:32:26 PM	27	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:32:26 PM	8	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:32:26 PM	10	1275.50	AQEU
GENMAB A/S	03-Apr-2025	14:35:03 PM	16	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:35:03 PM	25	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:35:03 PM	64	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:35:03 PM	6	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:35:15 PM	4	1275.50	CEUX
GENMAB A/S	03-Apr-2025	14:35:15 PM	25	1275.50	CEUX
GENMAB A/S	03-Apr-2025	14:35:15 PM	7	1275.50	CEUX
GENMAB A/S	03-Apr-2025	14:35:15 PM	25	1275.50	CEUX
GENMAB A/S	03-Apr-2025	14:37:27 PM	27	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:37:27 PM	15	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:37:27 PM	28	1276.00	TQEX
GENMAB A/S	03-Apr-2025	14:37:28 PM	21	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:37:28 PM	19	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:37:29 PM	22	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:37:29 PM	27	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:37:30 PM	13	1276.50	XCSE
GENMAB A/S	03-Apr-2025	14:37:30 PM	9	1276.50	CEUX
GENMAB A/S	03-Apr-2025	14:37:48 PM	32	1276.50	CEUX
GENMAB A/S	03-Apr-2025	14:37:49 PM	41	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:37:49 PM	35	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:37:49 PM	7	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:37:55 PM	13	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:37:55 PM	12	1277.00	CEUX
GENMAB A/S	03-Apr-2025	14:38:24 PM	3	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:39:26 PM	36	1277.50	CEUX

27

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	14:40:26 PM	5	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:40:26 PM	15	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:40:43 PM	49	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:40:43 PM	34	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:40:43 PM	4	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:41:43 PM	24	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:41:44 PM	19	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:41:44 PM	34	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:42:26 PM	16	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:42:36 PM	5	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:42:36 PM	79	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:42:42 PM	9	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:42:46 PM	8	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:42:46 PM	28	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:42:53 PM	9	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:42:54 PM	30	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:42:54 PM	8	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:42:54 PM	44	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:24 PM	30	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:24 PM	35	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:24 PM	46	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:27 PM	55	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:28 PM	9	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:29 PM	19	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:29 PM	11	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:34 PM	10	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:34 PM	48	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:34 PM	49	1277.50	XCSE
GENMAB A/S	03-Apr-2025	14:43:36 PM	84	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:43:36 PM	24	1277.00	TQEX
GENMAB A/S	03-Apr-2025	14:43:36 PM	24	1277.00	AQEU
GENMAB A/S	03-Apr-2025	14:43:37 PM	52	1276.50	CEUX
GENMAB A/S	03-Apr-2025	14:44:29 PM	41	1276.00	XCSE
GENMAB A/S	03-Apr-2025	14:44:29 PM	29	1276.00	TQEX
GENMAB A/S	03-Apr-2025	14:44:35 PM	8	1276.00	AQEU
GENMAB A/S	03-Apr-2025	14:44:38 PM	20	1276.00	AQEU
GENMAB A/S	03-Apr-2025	14:44:41 PM	4	1276.00	AQEU
GENMAB A/S	03-Apr-2025	14:45:26 PM	83	1275.50	CEUX
GENMAB A/S	03-Apr-2025	14:45:27 PM	10	1275.50	XCSE
GENMAB A/S	03-Apr-2025	14:45:56 PM	84	1275.00	XCSE
GENMAB A/S	03-Apr-2025	14:45:56 PM	24	1275.00	TQEX
GENMAB A/S	03-Apr-2025	14:45:56 PM	30	1275.00	AQEU
GENMAB A/S	03-Apr-2025	14:46:17 PM	86	1274.00	XCSE
GENMAB A/S	03-Apr-2025	14:46:17 PM	27	1274.00	CEUX
GENMAB A/S	03-Apr-2025	14:46:17 PM	57	1274.00	CEUX

28

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	14:48:21 PM	24	1273.50	TQEX
GENMAB A/S	03-Apr-2025	14:49:09 PM	40	1275.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:03 PM	37	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:03 PM	1	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:03 PM	44	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:03 PM	29	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:03 PM	30	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:03 PM	70	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:03 PM	11	1277.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:44 PM	16	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:50:44 PM	40	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:51:09 PM	16	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:51:09 PM	10	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:51:09 PM	17	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:51:09 PM	4	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:51:09 PM	88	1278.00	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	149	1278.00	XCSE
GENMAB A/S	03-Apr-2025	14:51:29 PM	85	1281.00	XCSE
GENMAB A/S	03-Apr-2025	14:51:29 PM	87	1280.00	XCSE
GENMAB A/S	03-Apr-2025	14:51:29 PM	82	1278.50	XCSE
GENMAB A/S	03-Apr-2025	14:51:29 PM	28	1281.00	TQEX
GENMAB A/S	03-Apr-2025	14:51:29 PM	36	1280.00	TQEX
GENMAB A/S	03-Apr-2025	14:51:29 PM	87	1280.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	85	1279.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	87	1278.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	18	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	1	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	6	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	3	1277.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:29 PM	3	1278.00	AQEU
GENMAB A/S	03-Apr-2025	14:51:29 PM	24	1281.00	AQEU
GENMAB A/S	03-Apr-2025	14:51:29 PM	31	1280.00	AQEU
GENMAB A/S	03-Apr-2025	14:51:29 PM	30	1279.00	AQEU
GENMAB A/S	03-Apr-2025	14:51:30 PM	24	1280.50	XCSE
GENMAB A/S	03-Apr-2025	14:51:30 PM	33	1279.50	XCSE
GENMAB A/S	03-Apr-2025	14:51:30 PM	30	1278.50	XCSE
GENMAB A/S	03-Apr-2025	14:51:30 PM	31	1280.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:30 PM	43	1279.50	CEUX
GENMAB A/S	03-Apr-2025	14:51:30 PM	53	1278.50	CEUX
GENMAB A/S	03-Apr-2025	14:52:18 PM	7	1279.50	XCSE
GENMAB A/S	03-Apr-2025	14:52:20 PM	15	1279.50	XCSE
GENMAB A/S	03-Apr-2025	14:52:20 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	14:54:28 PM	66	1282.50	XCSE
GENMAB A/S	03-Apr-2025	14:56:20 PM	83	1286.00	XCSE
GENMAB A/S	03-Apr-2025	14:56:20 PM	28	1286.50	TQEX

29

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	14:56:20 PM	65	1286.00	CEUX
GENMAB A/S	03-Apr-2025	14:56:20 PM	24	1286.00	AQEU
GENMAB A/S	03-Apr-2025	14:56:28 PM	78	1285.00	XCSE
GENMAB A/S	03-Apr-2025	14:56:28 PM	60	1285.00	CEUX
GENMAB A/S	03-Apr-2025	14:57:03 PM	16	1284.00	XCSE
GENMAB A/S	03-Apr-2025	14:57:27 PM	49	1284.00	CEUX
GENMAB A/S	03-Apr-2025	14:57:28 PM	55	1284.00	XCSE
GENMAB A/S	03-Apr-2025	14:57:28 PM	6	1284.00	CEUX
GENMAB A/S	03-Apr-2025	14:58:11 PM	85	1286.00	XCSE
GENMAB A/S	03-Apr-2025	14:58:11 PM	53	1286.00	CEUX
GENMAB A/S	03-Apr-2025	14:59:27 PM	85	1286.00	XCSE
GENMAB A/S	03-Apr-2025	14:59:27 PM	39	1286.00	CEUX
GENMAB A/S	03-Apr-2025	15:00:17 PM	16	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:00:17 PM	1	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:00:17 PM	69	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:00:17 PM	46	1287.00	TQEX
GENMAB A/S	03-Apr-2025	15:00:17 PM	44	1287.00	CEUX
GENMAB A/S	03-Apr-2025	15:02:26 PM	46	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:03:02 PM	15	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:03:02 PM	69	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:03:02 PM	25	1287.00	AQEU
GENMAB A/S	03-Apr-2025	15:04:17 PM	9	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	9	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	6	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	32	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	44	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	3	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	3	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	5	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:17 PM	22	1286.00	AQEU
GENMAB A/S	03-Apr-2025	15:04:23 PM	7	1286.00	CEUX
GENMAB A/S	03-Apr-2025	15:04:27 PM	83	1286.00	XCSE
GENMAB A/S	03-Apr-2025	15:04:27 PM	32	1286.00	CEUX
GENMAB A/S	03-Apr-2025	15:06:26 PM	65	1285.00	XCSE
GENMAB A/S	03-Apr-2025	15:06:26 PM	24	1285.00	TQEX
GENMAB A/S	03-Apr-2025	15:06:26 PM	30	1285.00	CEUX
GENMAB A/S	03-Apr-2025	15:07:28 PM	44	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:07:28 PM	11	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:07:28 PM	30	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:07:28 PM	26	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:07:28 PM	52	1284.00	CEUX
GENMAB A/S	03-Apr-2025	15:07:28 PM	24	1284.00	AQEU
GENMAB A/S	03-Apr-2025	15:08:09 PM	23	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:08:09 PM	24	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:08:09 PM	44	1284.50	XCSE

30

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:08:09 PM	20	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:08:29 PM	82	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:09:59 PM	34	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:09:59 PM	10	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:09:59 PM	36	1283.50	TQEX
GENMAB A/S	03-Apr-2025	15:09:59 PM	33	1283.50	CEUX
GENMAB A/S	03-Apr-2025	15:09:59 PM	36	1283.50	CEUX
GENMAB A/S	03-Apr-2025	15:09:59 PM	19	1283.50	CEUX
GENMAB A/S	03-Apr-2025	15:10:27 PM	39	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:10:27 PM	50	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:10:35 PM	37	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:10:45 PM	2	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:10:45 PM	22	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:10:48 PM	86	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:10:48 PM	64	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:12:26 PM	2	1283.50	AQEU
GENMAB A/S	03-Apr-2025	15:12:28 PM	44	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:12:28 PM	19	1283.50	CEUX
GENMAB A/S	03-Apr-2025	15:13:11 PM	83	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:13:11 PM	45	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:13:11 PM	14	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:13:11 PM	25	1283.50	TQEX
GENMAB A/S	03-Apr-2025	15:13:11 PM	20	1283.50	CEUX
GENMAB A/S	03-Apr-2025	15:13:11 PM	46	1283.50	CEUX
GENMAB A/S	03-Apr-2025	15:14:11 PM	82	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:14:11 PM	81	1283.50	CEUX
GENMAB A/S	03-Apr-2025	15:14:22 PM	87	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:14:22 PM	25	1282.50	TQEX
GENMAB A/S	03-Apr-2025	15:14:22 PM	19	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:14:22 PM	65	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:14:22 PM	8	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:14:22 PM	26	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:15:39 PM	9	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:15:39 PM	4	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:15:39 PM	36	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:17:26 PM	31	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:18:00 PM	45	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:18:00 PM	28	1282.00	AQEU
GENMAB A/S	03-Apr-2025	15:18:04 PM	82	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:18:04 PM	37	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:18:04 PM	19	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:18:04 PM	84	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:18:06 PM	45	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:18:06 PM	15	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:18:06 PM	11	1282.50	XCSE

31

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:18:28 PM	6	1282.00	AQEU
GENMAB A/S	03-Apr-2025	15:18:28 PM	11	1282.00	AQEU
GENMAB A/S	03-Apr-2025	15:19:27 PM	7	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:19:27 PM	5	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:19:28 PM	18	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:20:26 PM	32	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:20:26 PM	21	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:21:12 PM	85	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:21:12 PM	30	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:21:12 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:21:12 PM	26	1282.50	TQEX
GENMAB A/S	03-Apr-2025	15:21:12 PM	81	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:21:12 PM	35	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:21:13 PM	30	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:21:13 PM	25	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:21:13 PM	29	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:21:13 PM	27	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:21:21 PM	11	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:21:21 PM	12	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:21:26 PM	35	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:21:59 PM	71	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:22:45 PM	25	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:23:09 PM	15	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:23:26 PM	17	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:24:09 PM	24	1282.50	TQEX
GENMAB A/S	03-Apr-2025	15:24:09 PM	87	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:24:22 PM	36	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:24:26 PM	9	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:24:26 PM	3	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:24:26 PM	1	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	82	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:25:00 PM	9	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	3	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	3	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:25:00 PM	11	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	8	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	3	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	3	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	CEUX

32

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:25:00 PM	3	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	3	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	11	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	2	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:25:00 PM	29	1282.00	AQEU
GENMAB A/S	03-Apr-2025	15:25:08 PM	85	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:25:08 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:25:08 PM	10	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:25:08 PM	1	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:25:08 PM	1	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:25:08 PM	11	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:25:08 PM	11	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:25:08 PM	31	1282.00	TQEX
GENMAB A/S	03-Apr-2025	15:26:09 PM	42	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:27:04 PM	12	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:27:04 PM	11	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:27:04 PM	17	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:27:04 PM	63	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:27:04 PM	8	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:27:04 PM	36	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:27:06 PM	36	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:27:50 PM	6	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:27:50 PM	43	1285.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:00 PM	47	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:28:00 PM	1	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:28:00 PM	1	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:28:00 PM	59	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:28:19 PM	87	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:28:19 PM	45	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:19 PM	1	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:19 PM	1	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:19 PM	23	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:19 PM	41	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:19 PM	46	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:19 PM	37	1287.00	TQEX
GENMAB A/S	03-Apr-2025	15:28:19 PM	81	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:28:19 PM	32	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:28:19 PM	10	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:28:19 PM	78	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:28:19 PM	87	1287.00	CEUX
GENMAB A/S	03-Apr-2025	15:28:19 PM	34	1287.50	AQEU
GENMAB A/S	03-Apr-2025	15:28:19 PM	20	1286.50	AQEU
GENMAB A/S	03-Apr-2025	15:28:32 PM	87	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:32 PM	27	1289.00	TQEX

33

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:28:32 PM	11	1289.00	CEUX
GENMAB A/S	03-Apr-2025	15:28:32 PM	71	1289.00	CEUX
GENMAB A/S	03-Apr-2025	15:28:32 PM	25	1288.50	AQEU
GENMAB A/S	03-Apr-2025	15:28:33 PM	46	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:33 PM	41	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:33 PM	24	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:28:33 PM	11	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:29:03 PM	24	1288.50	AQEU
GENMAB A/S	03-Apr-2025	15:29:21 PM	87	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:29:21 PM	37	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:29:21 PM	11	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:29:21 PM	41	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:29:21 PM	24	1288.00	TQEX
GENMAB A/S	03-Apr-2025	15:29:22 PM	38	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:29:26 PM	9	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:29:27 PM	82	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:29:58 PM	12	1287.50	AQEU
GENMAB A/S	03-Apr-2025	15:30:00 PM	26	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:00 PM	56	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:00 PM	3	1289.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:00 PM	3	1289.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:00 PM	4	1289.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:00 PM	4	1289.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:01 PM	26	1292.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:01 PM	58	1292.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:01 PM	82	1291.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:03 PM	30	1292.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:03 PM	41	1292.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:03 PM	83	1291.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:03 PM	5	1290.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:03 PM	82	1290.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:03 PM	24	1291.00	TQEX
GENMAB A/S	03-Apr-2025	15:30:03 PM	26	1291.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:03 PM	70	1290.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:03 PM	11	1290.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:15 PM	87	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:15 PM	45	1291.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:15 PM	41	1291.50	XCSE
GENMAB A/S	03-Apr-2025	15:30:15 PM	24	1291.50	TQEX
GENMAB A/S	03-Apr-2025	15:30:15 PM	33	1291.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:24 PM	41	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:24 PM	13	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:24 PM	12	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:24 PM	11	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:24 PM	20	1290.50	CEUX

34

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:30:24 PM	5	1290.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:24 PM	20	1290.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:31 PM	19	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:31 PM	11	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:31 PM	56	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:50 PM	41	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:50 PM	15	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:50 PM	30	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:50 PM	25	1291.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:50 PM	29	1290.50	TQEX
GENMAB A/S	03-Apr-2025	15:30:50 PM	5	1290.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:51 PM	86	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:51 PM	27	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:30:51 PM	82	1289.50	CEUX
GENMAB A/S	03-Apr-2025	15:30:51 PM	31	1289.50	AQEU
GENMAB A/S	03-Apr-2025	15:31:03 PM	87	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:03 PM	42	1289.50	CEUX
GENMAB A/S	03-Apr-2025	15:31:10 PM	25	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:31:14 PM	73	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:14 PM	10	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:14 PM	3	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:14 PM	26	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:14 PM	24	1287.50	TQEX
GENMAB A/S	03-Apr-2025	15:31:14 PM	59	1287.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:14 PM	28	1287.50	AQEU
GENMAB A/S	03-Apr-2025	15:31:15 PM	3	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:15 PM	4	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:15 PM	2	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:25 PM	46	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:25 PM	10	1286.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:26 PM	34	1286.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:42 PM	8	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	76	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	82	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	12	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	10	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	46	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	15	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	4	1284.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:43 PM	24	1284.00	TQEX
GENMAB A/S	03-Apr-2025	15:31:43 PM	32	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:31:43 PM	15	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:31:43 PM	1	1284.50	CEUX
GENMAB A/S	03-Apr-2025	15:31:43 PM	25	1284.00	AQEU
GENMAB A/S	03-Apr-2025	15:31:44 PM	6	1283.00	XCSE

35

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:31:44 PM	9	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:44 PM	15	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:44 PM	2	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:44 PM	15	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:44 PM	13	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:44 PM	7	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:44 PM	13	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:45 PM	4	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:45 PM	3	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:45 PM	46	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:31:45 PM	1	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:31:46 PM	27	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:32:35 PM	86	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:41 PM	25	1285.00	CEUX
GENMAB A/S	03-Apr-2025	15:32:46 PM	41	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:46 PM	15	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:46 PM	2	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:46 PM	45	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:46 PM	20	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:32:46 PM	4	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:32:50 PM	81	1285.00	XCSE
GENMAB A/S	03-Apr-2025	15:32:50 PM	30	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:50 PM	20	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:50 PM	11	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:50 PM	24	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:50 PM	26	1285.50	XCSE
GENMAB A/S	03-Apr-2025	15:32:50 PM	20	1284.50	TQEX
GENMAB A/S	03-Apr-2025	15:32:50 PM	4	1285.00	CEUX
GENMAB A/S	03-Apr-2025	15:32:50 PM	20	1285.00	CEUX
GENMAB A/S	03-Apr-2025	15:32:50 PM	34	1285.00	CEUX
GENMAB A/S	03-Apr-2025	15:32:50 PM	25	1285.00	AQEU
GENMAB A/S	03-Apr-2025	15:33:29 PM	81	1286.00	XCSE
GENMAB A/S	03-Apr-2025	15:33:29 PM	15	1286.00	XCSE
GENMAB A/S	03-Apr-2025	15:33:29 PM	2	1286.00	XCSE
GENMAB A/S	03-Apr-2025	15:33:29 PM	3	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:33:29 PM	2	1285.50	CEUX
GENMAB A/S	03-Apr-2025	15:33:29 PM	32	1286.00	AQEU
GENMAB A/S	03-Apr-2025	15:33:41 PM	4	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:33:41 PM	4	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:33:41 PM	2	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:33:41 PM	4	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:33:41 PM	32	1285.50	CEUX
GENMAB A/S	03-Apr-2025	15:33:41 PM	10	1285.50	CEUX
GENMAB A/S	03-Apr-2025	15:33:41 PM	7	1285.50	CEUX
GENMAB A/S	03-Apr-2025	15:33:41 PM	12	1285.50	CEUX

36

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:33:44 PM	10	1285.50	CEUX
GENMAB A/S	03-Apr-2025	15:33:44 PM	15	1285.50	CEUX
GENMAB A/S	03-Apr-2025	15:34:10 PM	41	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:34:10 PM	12	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:34:10 PM	10	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:34:10 PM	43	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:34:10 PM	40	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:34:29 PM	81	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:34:32 PM	82	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:34:32 PM	50	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:34:32 PM	15	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:34:32 PM	28	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:34:32 PM	15	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:34:32 PM	3	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:34:32 PM	2	1287.50	TQEX
GENMAB A/S	03-Apr-2025	15:34:32 PM	10	1287.50	AQEU
GENMAB A/S	03-Apr-2025	15:34:32 PM	10	1287.50	AQEU
GENMAB A/S	03-Apr-2025	15:35:07 PM	81	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:07 PM	41	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:07 PM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:07 PM	5	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:07 PM	41	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:07 PM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:07 PM	2	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:07 PM	33	1289.50	TQEX
GENMAB A/S	03-Apr-2025	15:35:07 PM	84	1290.00	CEUX
GENMAB A/S	03-Apr-2025	15:35:07 PM	32	1289.50	CEUX
GENMAB A/S	03-Apr-2025	15:35:07 PM	8	1289.50	AQEU
GENMAB A/S	03-Apr-2025	15:35:07 PM	16	1289.50	AQEU
GENMAB A/S	03-Apr-2025	15:35:07 PM	7	1289.50	AQEU
GENMAB A/S	03-Apr-2025	15:35:20 PM	32	1289.50	TQEX
GENMAB A/S	03-Apr-2025	15:35:20 PM	23	1289.50	AQEU
GENMAB A/S	03-Apr-2025	15:35:27 PM	12	1289.50	CEUX
GENMAB A/S	03-Apr-2025	15:35:40 PM	84	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:40 PM	10	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:40 PM	18	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:35:40 PM	37	1288.50	TQEX
GENMAB A/S	03-Apr-2025	15:35:40 PM	2	1289.00	CEUX
GENMAB A/S	03-Apr-2025	15:35:40 PM	79	1289.00	CEUX
GENMAB A/S	03-Apr-2025	15:35:40 PM	3	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:35:40 PM	63	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:35:40 PM	5	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:35:40 PM	5	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:36:11 PM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:11 PM	71	1290.00	XCSE

37

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:36:12 PM	41	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:12 PM	30	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:12 PM	3	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:12 PM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:12 PM	11	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:12 PM	2	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:12 PM	45	1290.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:17 PM	25	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:17 PM	62	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:17 PM	26	1289.00	TQEX
GENMAB A/S	03-Apr-2025	15:36:17 PM	85	1289.00	CEUX
GENMAB A/S	03-Apr-2025	15:36:17 PM	20	1289.00	AQEU
GENMAB A/S	03-Apr-2025	15:36:17 PM	11	1289.00	AQEU
GENMAB A/S	03-Apr-2025	15:36:30 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	7	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	5	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	12	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	8	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	41	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	7	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	30	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	18	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:36:30 PM	6	1288.00	CEUX
GENMAB A/S	03-Apr-2025	15:36:31 PM	20	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:36:44 PM	41	1289.50	XCSE
GENMAB A/S	03-Apr-2025	15:36:44 PM	12	1289.50	XCSE
GENMAB A/S	03-Apr-2025	15:36:47 PM	4	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:08 PM	84	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:08 PM	60	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:08 PM	86	1289.50	CEUX
GENMAB A/S	03-Apr-2025	15:37:08 PM	5	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:37:08 PM	15	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:37:08 PM	20	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:37:08 PM	18	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:37:08 PM	5	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:37:09 PM	28	1289.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	19	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	3	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	11	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	26	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	21	1288.00	XCSE

38

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:37:31 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	11	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	35	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:37:31 PM	24	1288.50	TQEX
GENMAB A/S	03-Apr-2025	15:37:31 PM	3	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:37:34 PM	88	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:37:34 PM	15	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:38:11 PM	86	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:38:11 PM	27	1288.50	TQEX
GENMAB A/S	03-Apr-2025	15:38:11 PM	1	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:38:11 PM	12	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:38:11 PM	73	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:38:11 PM	25	1288.50	AQEU
GENMAB A/S	03-Apr-2025	15:38:44 PM	7	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:38:55 PM	19	1288.50	AQEU
GENMAB A/S	03-Apr-2025	15:39:05 PM	43	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:12 PM	87	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	3	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	3	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	4	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	3	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	2	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	9	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	3	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	3	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	15	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	40	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	19	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	5	1288.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:12 PM	10	1287.00	TQEX
GENMAB A/S	03-Apr-2025	15:39:12 PM	15	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:12 PM	21	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:12 PM	9	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:12 PM	1	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:12 PM	75	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:22 PM	20	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:32 PM	10	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:32 PM	58	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:49 PM	85	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:49 PM	41	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:39:49 PM	14	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:39:49 PM	11	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:39:49 PM	41	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:39:49 PM	20	1287.00	XCSE

39

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:39:49 PM	19	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:39:49 PM	20	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:49 PM	20	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:39:49 PM	32	1287.00	AQEU
GENMAB A/S	03-Apr-2025	15:39:58 PM	15	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:39:58 PM	11	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:39:58 PM	41	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:40:01 PM	12	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:40:01 PM	41	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:40:01 PM	6	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:40:02 PM	11	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:40:49 PM	36	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	41	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	12	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	21	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	2	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	46	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	12	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	30	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:07 PM	17	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:41:07 PM	31	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:41:07 PM	15	1286.00	AQEU
GENMAB A/S	03-Apr-2025	15:41:07 PM	5	1286.00	AQEU
GENMAB A/S	03-Apr-2025	15:41:08 PM	41	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:08 PM	12	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:41:08 PM	12	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:42:02 PM	88	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:42:02 PM	41	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:42:02 PM	35	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:42:02 PM	35	1288.50	XCSE
GENMAB A/S	03-Apr-2025	15:42:02 PM	28	1288.00	TQEX
GENMAB A/S	03-Apr-2025	15:42:02 PM	88	1288.50	CEUX
GENMAB A/S	03-Apr-2025	15:42:19 PM	88	1287.50	XCSE
GENMAB A/S	03-Apr-2025	15:42:23 PM	85	1287.50	CEUX
GENMAB A/S	03-Apr-2025	15:42:23 PM	32	1287.50	AQEU
GENMAB A/S	03-Apr-2025	15:42:27 PM	3	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:42:28 PM	8	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:42:42 PM	16	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:42:42 PM	68	1287.00	XCSE
GENMAB A/S	03-Apr-2025	15:42:42 PM	24	1287.50	AQEU
GENMAB A/S	03-Apr-2025	15:42:47 PM	31	1286.50	XCSE
GENMAB A/S	03-Apr-2025	15:42:47 PM	31	1286.50	TQEX
GENMAB A/S	03-Apr-2025	15:42:47 PM	17	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:42:47 PM	14	1286.50	CEUX
GENMAB A/S	03-Apr-2025	15:42:47 PM	51	1286.50	CEUX

40

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:43:19 PM	68	1286.00	XCSE
GENMAB A/S	03-Apr-2025	15:43:49 PM	20	1286.00	XCSE
GENMAB A/S	03-Apr-2025	15:43:49 PM	14	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:43:50 PM	10	1285.50	TQEX
GENMAB A/S	03-Apr-2025	15:44:10 PM	13	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:44:10 PM	72	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:44:10 PM	16	1284.50	XCSE
GENMAB A/S	03-Apr-2025	15:44:10 PM	86	1285.00	CEUX
GENMAB A/S	03-Apr-2025	15:44:10 PM	38	1284.00	CEUX
GENMAB A/S	03-Apr-2025	15:44:10 PM	29	1285.00	AQEU
GENMAB A/S	03-Apr-2025	15:44:15 PM	21	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:44:15 PM	61	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:44:15 PM	20	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:44:15 PM	85	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:44:15 PM	29	1284.00	TQEX
GENMAB A/S	03-Apr-2025	15:44:15 PM	26	1283.00	TQEX
GENMAB A/S	03-Apr-2025	15:44:15 PM	47	1284.00	CEUX
GENMAB A/S	03-Apr-2025	15:44:15 PM	81	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:44:18 PM	59	1282.00	CEUX
GENMAB A/S	03-Apr-2025	15:44:18 PM	26	1282.00	CEUX
GENMAB A/S	03-Apr-2025	15:45:09 PM	82	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:45:09 PM	82	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:45:59 PM	1	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:46:27 PM	9	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:46:59 PM	24	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:47:05 PM	32	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:47:22 PM	16	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	66	1283.00	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	41	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	2	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	2	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	10	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	38	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	18	1283.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:22 PM	33	1283.00	TQEX
GENMAB A/S	03-Apr-2025	15:47:22 PM	39	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:47:22 PM	44	1283.00	CEUX
GENMAB A/S	03-Apr-2025	15:47:22 PM	20	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:47:22 PM	6	1283.00	AQEU
GENMAB A/S	03-Apr-2025	15:47:26 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:26 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:47:26 PM	28	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:47:26 PM	17	1282.00	AQEU
GENMAB A/S	03-Apr-2025	15:47:39 PM	54	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:47:40 PM	4	1282.00	TQEX

41

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:47:40 PM	20	1282.00	TQEX
GENMAB A/S	03-Apr-2025	15:47:40 PM	58	1282.00	CEUX
GENMAB A/S	03-Apr-2025	15:47:45 PM	9	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:02 PM	34	1282.00	TQEX
GENMAB A/S	03-Apr-2025	15:48:26 PM	21	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:30 PM	9	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:30 PM	13	1281.50	AQEU
GENMAB A/S	03-Apr-2025	15:48:31 PM	33	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:31 PM	42	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:41 PM	30	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:48:41 PM	3	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:48:41 PM	45	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:48:41 PM	13	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:48:41 PM	13	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:41 PM	13	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:41 PM	36	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:48:41 PM	36	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:48:41 PM	22	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:48:45 PM	15	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:48:50 PM	20	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:48:56 PM	25	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:56 PM	34	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:48:56 PM	10	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:48:56 PM	10	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:48:56 PM	31	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:49:35 PM	26	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:49:35 PM	29	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:50:09 PM	2	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:50:29 PM	26	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	55	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	30	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	15	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	2	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	2	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	20	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	10	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:50:29 PM	36	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:50:29 PM	5	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:51:02 PM	41	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:02 PM	14	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:02 PM	41	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:02 PM	21	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:02 PM	36	1282.00	CEUX

42

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:51:02 PM	36	1282.00	CEUX
GENMAB A/S	03-Apr-2025	15:51:02 PM	34	1282.00	CEUX
GENMAB A/S	03-Apr-2025	15:51:02 PM	10	1281.50	AQEU
GENMAB A/S	03-Apr-2025	15:51:02 PM	10	1281.50	AQEU
GENMAB A/S	03-Apr-2025	15:51:02 PM	7	1281.50	AQEU
GENMAB A/S	03-Apr-2025	15:51:03 PM	45	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:03 PM	12	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:03 PM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:03 PM	13	1282.00	CEUX
GENMAB A/S	03-Apr-2025	15:51:04 PM	9	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:04 PM	9	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	37	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	16	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	41	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	30	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	20	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:07 PM	29	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:51:07 PM	9	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:51:07 PM	77	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:51:08 PM	17	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:08 PM	18	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:08 PM	41	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:08 PM	35	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:08 PM	16	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:08 PM	20	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:12 PM	14	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:12 PM	20	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:26 PM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:27 PM	30	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:27 PM	2	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:27 PM	45	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:27 PM	16	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:27 PM	30	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:28 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:29 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:32 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:32 PM	6	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:35 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:45 PM	84	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:45 PM	41	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:45 PM	30	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:45 PM	12	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:45 PM	10	1280.50	XCSE

43

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:51:45 PM	29	1280.50	TQEX
GENMAB A/S	03-Apr-2025	15:51:45 PM	82	1280.50	CEUX
GENMAB A/S	03-Apr-2025	15:51:45 PM	34	1280.00	AQEU
GENMAB A/S	03-Apr-2025	15:51:46 PM	4	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:46 PM	8	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:46 PM	17	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:46 PM	20	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:46 PM	13	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:46 PM	5	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:47 PM	11	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:51 PM	11	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:51 PM	11	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:55 PM	10	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:55 PM	53	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:51:57 PM	9	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:58 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:58 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:51:58 PM	7	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:52:08 PM	17	1281.50	XCSE
GENMAB A/S	03-Apr-2025	15:52:31 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:52:31 PM	1	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:52:31 PM	35	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:52:31 PM	14	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:52:31 PM	11	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:52:31 PM	27	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:53:00 PM	1	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:53:00 PM	20	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:53:00 PM	23	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:53:00 PM	39	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:53:00 PM	16	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:53:00 PM	8	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:53:00 PM	31	1282.50	TQEX
GENMAB A/S	03-Apr-2025	15:53:00 PM	87	1282.50	CEUX
GENMAB A/S	03-Apr-2025	15:53:00 PM	14	1282.00	AQEU
GENMAB A/S	03-Apr-2025	15:53:08 PM	19	1282.50	XCSE
GENMAB A/S	03-Apr-2025	15:53:12 PM	33	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:12 PM	12	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:12 PM	31	1282.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:12 PM	5	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:53:12 PM	11	1282.00	AQEU
GENMAB A/S	03-Apr-2025	15:53:13 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:13 PM	25	1281.50	TQEX
GENMAB A/S	03-Apr-2025	15:53:13 PM	79	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:53:24 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:55 PM	15	1281.00	XCSE

44

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:53:55 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:55 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:55 PM	28	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:55 PM	33	1281.50	CEUX
GENMAB A/S	03-Apr-2025	15:53:55 PM	16	1281.00	AQEU
GENMAB A/S	03-Apr-2025	15:53:55 PM	8	1281.00	AQEU
GENMAB A/S	03-Apr-2025	15:53:58 PM	41	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:58 PM	21	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:53:58 PM	26	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:54:02 PM	41	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:02 PM	20	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:02 PM	31	1280.50	TQEX
GENMAB A/S	03-Apr-2025	15:54:02 PM	41	1280.50	CEUX
GENMAB A/S	03-Apr-2025	15:54:02 PM	45	1280.50	CEUX
GENMAB A/S	03-Apr-2025	15:54:12 PM	7	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	3	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	1	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	3	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	8	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	3	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	3	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	38	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	13	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	3	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	2	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:54:12 PM	24	1280.00	AQEU
GENMAB A/S	03-Apr-2025	15:54:17 PM	19	1279.00	CEUX
GENMAB A/S	03-Apr-2025	15:54:17 PM	66	1279.00	CEUX
GENMAB A/S	03-Apr-2025	15:54:17 PM	3	1279.00	CEUX
GENMAB A/S	03-Apr-2025	15:54:17 PM	31	1279.00	AQEU
GENMAB A/S	03-Apr-2025	15:54:27 PM	35	1279.00	XCSE
GENMAB A/S	03-Apr-2025	15:55:10 PM	30	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:25 PM	75	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:55:25 PM	8	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:55:25 PM	3	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:55:54 PM	35	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	17	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	1	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	1	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	34	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	41	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:55:59 PM	24	1279.50	TQEX
GENMAB A/S	03-Apr-2025	15:55:59 PM	11	1279.50	CEUX

45

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:55:59 PM	10	1279.50	CEUX
GENMAB A/S	03-Apr-2025	15:55:59 PM	62	1279.50	CEUX
GENMAB A/S	03-Apr-2025	15:56:04 PM	111	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:56:19 PM	83	1279.50	CEUX
GENMAB A/S	03-Apr-2025	15:56:23 PM	8	1279.50	AQEU
GENMAB A/S	03-Apr-2025	15:56:24 PM	7	1279.50	AQEU
GENMAB A/S	03-Apr-2025	15:56:25 PM	12	1279.50	AQEU
GENMAB A/S	03-Apr-2025	15:56:35 PM	41	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:56:35 PM	1	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:56:35 PM	11	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:56:35 PM	12	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:56:47 PM	10	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:56:47 PM	25	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:56:49 PM	9	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:56:53 PM	6	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:56:53 PM	41	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:56:53 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:56:53 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:56:53 PM	1	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:57:21 PM	82	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:21 PM	26	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:21 PM	16	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:26 PM	15	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:26 PM	8	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:26 PM	18	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:30 PM	10	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:30 PM	1	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:30 PM	1	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:30 PM	10	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:30 PM	12	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:30 PM	13	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:30 PM	43	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:57:31 PM	41	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	12	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	10	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	22	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	26	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	8	1280.00	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	10	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	10	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	41	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	33	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	9	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	13	1280.00	XCSE
GENMAB A/S	03-Apr-2025	15:57:31 PM	10	1280.00	CEUX

46

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:57:34 PM	11	1280.00	XCSE
GENMAB A/S	03-Apr-2025	15:57:34 PM	12	1280.00	XCSE
GENMAB A/S	03-Apr-2025	15:57:34 PM	11	1279.50	AQEU
GENMAB A/S	03-Apr-2025	15:57:39 PM	13	1280.00	XCSE
GENMAB A/S	03-Apr-2025	15:57:56 PM	30	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:57:57 PM	53	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:58:19 PM	27	1279.50	TQEX
GENMAB A/S	03-Apr-2025	15:58:28 PM	22	1279.50	AQEU
GENMAB A/S	03-Apr-2025	15:59:09 PM	78	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:59:09 PM	7	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:59:13 PM	7	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:13 PM	83	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:59:13 PM	18	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:59:13 PM	5	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:59:13 PM	5	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:59:26 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:26 PM	20	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:26 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:26 PM	45	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:26 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:26 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:26 PM	14	1281.00	CEUX
GENMAB A/S	03-Apr-2025	15:59:29 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:29 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:30 PM	45	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:30 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:30 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:30 PM	14	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:31 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:32 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:35 PM	30	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:35 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:35 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:35 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:35 PM	30	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:35 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:35 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:36 PM	30	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:36 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:36 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:38 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:38 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:38 PM	53	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:38 PM	32	1281.00	XCSE
GENMAB A/S	03-Apr-2025	15:59:38 PM	5	1281.00	XCSE

47

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	15:59:38 PM	7	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:59:49 PM	83	1280.50	XCSE
GENMAB A/S	03-Apr-2025	15:59:49 PM	14	1280.50	AQEU
GENMAB A/S	03-Apr-2025	15:59:49 PM	10	1280.50	AQEU
GENMAB A/S	03-Apr-2025	15:59:58 PM	84	1279.50	XCSE
GENMAB A/S	03-Apr-2025	15:59:58 PM	43	1280.00	TQEX
GENMAB A/S	03-Apr-2025	15:59:58 PM	75	1280.00	CEUX
GENMAB A/S	03-Apr-2025	15:59:58 PM	24	1279.50	AQEU
GENMAB A/S	03-Apr-2025	16:00:00 PM	22	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:00 PM	1	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:00 PM	59	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:00 PM	24	1280.50	TQEX
GENMAB A/S	03-Apr-2025	16:00:00 PM	87	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:00:05 PM	24	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:05 PM	19	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:07 PM	60	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:07 PM	10	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:07 PM	6	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:07 PM	26	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:07 PM	25	1279.50	TQEX
GENMAB A/S	03-Apr-2025	16:00:19 PM	47	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:19 PM	4	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:19 PM	15	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:19 PM	12	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:26 PM	37	1279.50	CEUX
GENMAB A/S	03-Apr-2025	16:00:39 PM	28	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:39 PM	9	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:39 PM	19	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:39 PM	7	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:00:45 PM	83	1279.50	XCSE
GENMAB A/S	03-Apr-2025	16:00:51 PM	83	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:00:51 PM	11	1279.00	AQEU
GENMAB A/S	03-Apr-2025	16:00:51 PM	22	1279.00	AQEU
GENMAB A/S	03-Apr-2025	16:01:03 PM	15	1278.50	XCSE
GENMAB A/S	03-Apr-2025	16:01:03 PM	33	1278.50	XCSE
GENMAB A/S	03-Apr-2025	16:01:03 PM	34	1278.50	XCSE
GENMAB A/S	03-Apr-2025	16:01:03 PM	28	1278.50	TQEX
GENMAB A/S	03-Apr-2025	16:01:25 PM	81	1278.00	CEUX
GENMAB A/S	03-Apr-2025	16:01:26 PM	8	1277.00	TQEX
GENMAB A/S	03-Apr-2025	16:01:27 PM	7	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:01:27 PM	12	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:01:27 PM	25	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:01:37 PM	3	1277.50	XCSE
GENMAB A/S	03-Apr-2025	16:01:37 PM	10	1277.00	CEUX
GENMAB A/S	03-Apr-2025	16:01:42 PM	4	1277.50	XCSE

48

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:02:03 PM	8	1278.50	CEUX
GENMAB A/S	03-Apr-2025	16:02:19 PM	5	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:02:19 PM	18	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:02:19 PM	86	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:02:25 PM	41	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:25 PM	15	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:25 PM	10	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:25 PM	12	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:29 PM	12	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:41 PM	41	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:41 PM	12	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:41 PM	11	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:41 PM	39	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:41 PM	8	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:41 PM	34	1278.50	TQEX
GENMAB A/S	03-Apr-2025	16:02:41 PM	32	1278.50	CEUX
GENMAB A/S	03-Apr-2025	16:02:42 PM	30	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:42 PM	41	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:42 PM	11	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:42 PM	10	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:42 PM	19	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:49 PM	10	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:49 PM	10	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:49 PM	41	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:49 PM	38	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:49 PM	12	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:49 PM	13	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:02:49 PM	1	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:02:53 PM	17	1278.50	AQEU
GENMAB A/S	03-Apr-2025	16:02:53 PM	8	1278.50	AQEU
GENMAB A/S	03-Apr-2025	16:03:00 PM	12	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:00 PM	12	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:00 PM	12	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:00 PM	12	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:00 PM	12	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:00 PM	12	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:00 PM	4	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:26 PM	17	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:03:49 PM	51	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:01 PM	4	1278.00	TQEX
GENMAB A/S	03-Apr-2025	16:04:12 PM	5	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:04:12 PM	28	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:04:12 PM	78	1279.00	CEUX
GENMAB A/S	03-Apr-2025	16:04:22 PM	23	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:22 PM	21	1278.00	TQEX

49

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:04:22 PM	72	1278.00	CEUX
GENMAB A/S	03-Apr-2025	16:04:22 PM	11	1278.00	CEUX
GENMAB A/S	03-Apr-2025	16:04:26 PM	35	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:26 PM	7	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:26 PM	48	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:26 PM	42	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:26 PM	21	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:26 PM	33	1277.50	AQEU
GENMAB A/S	03-Apr-2025	16:04:26 PM	17	1277.50	AQEU
GENMAB A/S	03-Apr-2025	16:04:27 PM	17	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:31 PM	39	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:31 PM	13	1278.00	XCSE
GENMAB A/S	03-Apr-2025	16:04:58 PM	20	1278.00	CEUX
GENMAB A/S	03-Apr-2025	16:05:19 PM	41	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:19 PM	15	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:19 PM	7	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:19 PM	7	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:19 PM	12	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:19 PM	29	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:19 PM	43	1278.50	TQEX
GENMAB A/S	03-Apr-2025	16:05:41 PM	2	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:45 PM	18	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:05:49 PM	28	1279.00	XCSE
GENMAB A/S	03-Apr-2025	16:06:07 PM	23	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:06:07 PM	13	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:06:12 PM	1	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:06:13 PM	17	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:06:47 PM	8	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:06:47 PM	36	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:06:48 PM	36	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:06:56 PM	36	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:07:03 PM	36	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:07:24 PM	86	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:07:24 PM	31	1280.50	AQEU
GENMAB A/S	03-Apr-2025	16:07:39 PM	84	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:08:17 PM	41	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:17 PM	15	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:17 PM	45	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:17 PM	24	1281.00	TQEX
GENMAB A/S	03-Apr-2025	16:08:17 PM	36	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:08:17 PM	37	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:08:17 PM	33	1281.50	AQEU
GENMAB A/S	03-Apr-2025	16:08:26 PM	35	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:26 PM	27	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:33 PM	69	1281.50	XCSE

50

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:08:33 PM	6	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:35 PM	12	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:35 PM	11	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:37 PM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:45 PM	18	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:45 PM	61	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:45 PM	12	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:08:45 PM	39	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:08:50 PM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:50 PM	10	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:08:51 PM	17	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:09:19 PM	82	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:19 PM	45	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:19 PM	8	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:19 PM	25	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:09:19 PM	27	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:09:19 PM	20	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:09:19 PM	64	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:09:22 PM	2	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:23 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:23 PM	41	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:23 PM	39	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:23 PM	4	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:32 PM	85	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:09:59 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:59 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:59 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:09:59 PM	12	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:00 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:00 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:11 PM	26	1280.50	XCSE
GENMAB A/S	03-Apr-2025	16:10:12 PM	4	1280.50	XCSE
GENMAB A/S	03-Apr-2025	16:10:22 PM	34	1280.00	TQEX
GENMAB A/S	03-Apr-2025	16:10:22 PM	26	1280.00	TQEX
GENMAB A/S	03-Apr-2025	16:10:22 PM	21	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:22 PM	41	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:22 PM	25	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:22 PM	34	1280.00	AQEU
GENMAB A/S	03-Apr-2025	16:10:24 PM	70	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:24 PM	8	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:24 PM	50	1279.50	XCSE
GENMAB A/S	03-Apr-2025	16:10:24 PM	15	1279.50	XCSE
GENMAB A/S	03-Apr-2025	16:10:24 PM	24	1279.00	TQEX
GENMAB A/S	03-Apr-2025	16:10:24 PM	14	1279.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:24 PM	2	1279.50	CEUX

51

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:10:24 PM	69	1279.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:25 PM	1	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:25 PM	37	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:25 PM	41	1280.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:26 PM	30	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:10:27 PM	50	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:10:27 PM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:27 PM	19	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:27 PM	30	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:28 PM	4	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:29 PM	22	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:29 PM	2	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:29 PM	14	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	28	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	27	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	21	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	2	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	2	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	4	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	7	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	3	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:32 PM	29	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:33 PM	46	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:33 PM	32	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:10:33 PM	24	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:10:49 PM	20	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:10:49 PM	15	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:22 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:22 PM	3	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:22 PM	3	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:22 PM	3	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:22 PM	19	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:23 PM	34	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:26 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:26 PM	30	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:28 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:29 PM	8	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:29 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:29 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:29 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:11:29 PM	41	1282.50	XCSE

52

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:11:35 PM	85	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:11:35 PM	45	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:11:35 PM	8	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:11:35 PM	4	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:11:35 PM	14	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:11:39 PM	11	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:11:50 PM	17	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:11:58 PM	7	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:12:00 PM	41	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:12:06 PM	36	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:12:10 PM	8	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:12:15 PM	8	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:12:17 PM	27	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:12:17 PM	12	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:12:19 PM	27	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:12:19 PM	27	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:12:20 PM	26	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:12:21 PM	82	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:12:21 PM	42	1281.00	TQEX
GENMAB A/S	03-Apr-2025	16:12:23 PM	35	1281.00	AQEU
GENMAB A/S	03-Apr-2025	16:12:37 PM	87	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:13:07 PM	84	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:13:07 PM	42	1282.50	TQEX
GENMAB A/S	03-Apr-2025	16:13:07 PM	85	1282.50	CEUX
GENMAB A/S	03-Apr-2025	16:13:07 PM	5	1282.00	AQEU
GENMAB A/S	03-Apr-2025	16:13:27 PM	25	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:13:39 PM	11	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:13:39 PM	23	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:13:39 PM	1	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:13:46 PM	69	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:13:46 PM	39	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:13:46 PM	16	1281.50	CEUX
GENMAB A/S	03-Apr-2025	16:14:26 PM	30	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:14:26 PM	12	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:14:26 PM	11	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:14:26 PM	41	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:14:26 PM	39	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:14:26 PM	8	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:14:36 PM	2	1280.50	AQEU
GENMAB A/S	03-Apr-2025	16:14:39 PM	9	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:14:39 PM	11	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:14:40 PM	17	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:15:00 PM	40	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:15:00 PM	42	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:15:17 PM	36	1281.00	XCSE

53

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:15:17 PM	10	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:15:17 PM	37	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:15:17 PM	5	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	26	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	4	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	4	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	10	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	14	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	1	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	14	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	41	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:15:57 PM	81	1282.00	CEUX
GENMAB A/S	03-Apr-2025	16:16:08 PM	20	1281.50	AQEU
GENMAB A/S	03-Apr-2025	16:16:11 PM	27	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:19 PM	55	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:19 PM	83	1282.00	CEUX
GENMAB A/S	03-Apr-2025	16:16:29 PM	46	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:29 PM	11	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:29 PM	10	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:45 PM	3	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:46 PM	12	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:47 PM	14	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:16:59 PM	3	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:17:01 PM	8	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:17:04 PM	3	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:17:05 PM	3	1282.00	XCSE
GENMAB A/S	03-Apr-2025	16:17:10 PM	41	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:10 PM	14	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:10 PM	41	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:10 PM	3	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:10 PM	3	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:10 PM	9	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:10 PM	24	1281.50	TQEX
GENMAB A/S	03-Apr-2025	16:17:10 PM	17	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:17:10 PM	12	1281.50	AQEU
GENMAB A/S	03-Apr-2025	16:17:29 PM	41	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:29 PM	14	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:29 PM	27	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:49 PM	41	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:49 PM	8	1281.50	XCSE

54

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:17:49 PM	20	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:49 PM	12	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:49 PM	5	1281.50	XCSE
GENMAB A/S	03-Apr-2025	16:17:59 PM	87	1281.00	XCSE
GENMAB A/S	03-Apr-2025	16:17:59 PM	70	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:17:59 PM	40	1281.00	CEUX
GENMAB A/S	03-Apr-2025	16:18:01 PM	17	1280.50	AQEU
GENMAB A/S	03-Apr-2025	16:18:19 PM	15	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:18:19 PM	32	1280.50	TQEX
GENMAB A/S	03-Apr-2025	16:18:19 PM	7	1280.50	AQEU
GENMAB A/S	03-Apr-2025	16:18:22 PM	68	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:18:25 PM	33	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:18:37 PM	45	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:18:47 PM	39	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:18:59 PM	44	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:18:59 PM	14	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:19:05 PM	50	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:19:05 PM	4	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:19:05 PM	8	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:19:09 PM	44	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:19:09 PM	17	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:19:29 PM	8	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:19:29 PM	42	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:19:35 PM	34	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:19:41 PM	12	1279.50	XCSE
GENMAB A/S	03-Apr-2025	16:19:47 PM	44	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:19:47 PM	62	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:19:55 PM	36	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:19:55 PM	35	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:20:09 PM	44	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:20:09 PM	8	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:20:09 PM	9	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:20:09 PM	5	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:20:09 PM	5	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:20:09 PM	8	1280.00	XCSE
GENMAB A/S	03-Apr-2025	16:20:09 PM	82	1279.50	XCSE
GENMAB A/S	03-Apr-2025	16:20:17 PM	81	1279.50	CEUX
GENMAB A/S	03-Apr-2025	16:20:34 PM	44	1280.00	CEUX
GENMAB A/S	03-Apr-2025	16:20:35 PM	5	1282.50	AQEU
GENMAB A/S	03-Apr-2025	16:20:56 PM	40	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:20:56 PM	52	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:20:56 PM	7	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:20:56 PM	66	1282.50	CEUX
GENMAB A/S	03-Apr-2025	16:20:56 PM	20	1282.50	AQEU
GENMAB A/S	03-Apr-2025	16:20:56 PM	13	1282.50	AQEU

55

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:21:02 PM	20	1282.50	CEUX
GENMAB A/S	03-Apr-2025	16:21:02 PM	43	1282.50	CEUX
GENMAB A/S	03-Apr-2025	16:21:26 PM	12	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:21:26 PM	8	1282.50	XCSE
GENMAB A/S	03-Apr-2025	16:21:55 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:21:55 PM	44	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:21:55 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:21:55 PM	38	1284.00	TQEX
GENMAB A/S	03-Apr-2025	16:22:05 PM	30	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:22:05 PM	36	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:22:49 PM	12	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:22:49 PM	71	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:22:49 PM	36	1285.50	CEUX
GENMAB A/S	03-Apr-2025	16:22:49 PM	33	1285.50	AQEU
GENMAB A/S	03-Apr-2025	16:23:16 PM	84	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:23:16 PM	24	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:23:16 PM	29	1286.50	AQEU
GENMAB A/S	03-Apr-2025	16:23:17 PM	8	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:23:17 PM	2	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:23:17 PM	31	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:23:17 PM	5	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:23:28 PM	26	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:24:04 PM	87	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	52	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	35	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	3	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	3	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	12	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	6	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	46	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	2	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	5	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	11	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	47	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:24:04 PM	40	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:24:04 PM	24	1286.50	AQEU
GENMAB A/S	03-Apr-2025	16:24:05 PM	23	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:24:26 PM	6	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:25:00 PM	80	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:25:00 PM	31	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:25:15 PM	36	1290.00	CEUX
GENMAB A/S	03-Apr-2025	16:25:21 PM	17	1289.50	XCSE
GENMAB A/S	03-Apr-2025	16:25:21 PM	65	1289.50	XCSE
GENMAB A/S	03-Apr-2025	16:25:21 PM	37	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:25:21 PM	52	1290.00	XCSE

56

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:25:21 PM	3	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:25:21 PM	19	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:25:21 PM	26	1289.50	TQEX
GENMAB A/S	03-Apr-2025	16:25:21 PM	23	1289.50	TQEX
GENMAB A/S	03-Apr-2025	16:25:21 PM	63	1289.50	CEUX
GENMAB A/S	03-Apr-2025	16:25:21 PM	21	1289.50	CEUX
GENMAB A/S	03-Apr-2025	16:25:21 PM	29	1289.50	AQEU
GENMAB A/S	03-Apr-2025	16:26:06 PM	31	1292.00	TQEX
GENMAB A/S	03-Apr-2025	16:26:06 PM	20	1292.00	AQEU
GENMAB A/S	03-Apr-2025	16:26:06 PM	10	1292.00	AQEU
GENMAB A/S	03-Apr-2025	16:26:21 PM	5	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:26:21 PM	17	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:26:21 PM	50	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:26:21 PM	39	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:26:21 PM	31	1292.00	CEUX
GENMAB A/S	03-Apr-2025	16:26:46 PM	40	1294.00	CEUX
GENMAB A/S	03-Apr-2025	16:26:55 PM	36	1294.00	CEUX
GENMAB A/S	03-Apr-2025	16:27:15 PM	2	1294.00	CEUX
GENMAB A/S	03-Apr-2025	16:27:15 PM	1	1294.00	CEUX
GENMAB A/S	03-Apr-2025	16:27:15 PM	35	1294.00	CEUX
GENMAB A/S	03-Apr-2025	16:27:19 PM	8	1294.00	XCSE
GENMAB A/S	03-Apr-2025	16:27:19 PM	12	1294.00	XCSE
GENMAB A/S	03-Apr-2025	16:27:19 PM	4	1294.00	XCSE
GENMAB A/S	03-Apr-2025	16:27:55 PM	20	1295.00	TQEX
GENMAB A/S	03-Apr-2025	16:27:55 PM	11	1295.00	TQEX
GENMAB A/S	03-Apr-2025	16:27:55 PM	25	1295.00	CEUX
GENMAB A/S	03-Apr-2025	16:27:55 PM	36	1295.00	CEUX
GENMAB A/S	03-Apr-2025	16:27:55 PM	34	1295.00	AQEU
GENMAB A/S	03-Apr-2025	16:27:57 PM	10	1295.00	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	88	1294.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	45	1294.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	52	1294.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	14	1295.00	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	47	1294.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	1	1294.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	38	1295.00	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	12	1295.00	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	10	1295.00	XCSE
GENMAB A/S	03-Apr-2025	16:28:00 PM	85	1294.50	CEUX
GENMAB A/S	03-Apr-2025	16:28:25 PM	31	1294.00	TQEX
GENMAB A/S	03-Apr-2025	16:28:25 PM	2	1293.50	CEUX
GENMAB A/S	03-Apr-2025	16:28:28 PM	3	1293.50	CEUX
GENMAB A/S	03-Apr-2025	16:28:29 PM	3	1293.50	CEUX
GENMAB A/S	03-Apr-2025	16:28:39 PM	35	1293.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:52 PM	35	1294.50	XCSE

57

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:28:52 PM	11	1294.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:52 PM	37	1294.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:52 PM	39	1294.00	TQEX
GENMAB A/S	03-Apr-2025	16:28:52 PM	15	1294.00	CEUX
GENMAB A/S	03-Apr-2025	16:28:52 PM	33	1294.00	AQEU
GENMAB A/S	03-Apr-2025	16:28:52 PM	1	1294.00	AQEU
GENMAB A/S	03-Apr-2025	16:28:54 PM	2	1293.50	CEUX
GENMAB A/S	03-Apr-2025	16:28:55 PM	11	1294.00	XCSE
GENMAB A/S	03-Apr-2025	16:28:55 PM	22	1293.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:55 PM	28	1293.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:55 PM	45	1293.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:55 PM	46	1293.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:55 PM	20	1293.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:55 PM	84	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:28:55 PM	74	1293.50	CEUX
GENMAB A/S	03-Apr-2025	16:28:55 PM	35	1292.50	CEUX
GENMAB A/S	03-Apr-2025	16:28:55 PM	49	1292.50	CEUX
GENMAB A/S	03-Apr-2025	16:29:08 PM	52	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:29:08 PM	30	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:29:08 PM	29	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:29:08 PM	82	1291.00	XCSE
GENMAB A/S	03-Apr-2025	16:29:08 PM	43	1291.00	CEUX
GENMAB A/S	03-Apr-2025	16:29:16 PM	34	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:29:16 PM	2	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:29:22 PM	44	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:30:03 PM	23	1291.50	CEUX
GENMAB A/S	03-Apr-2025	16:30:15 PM	45	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:15 PM	1	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:15 PM	1	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:15 PM	14	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:15 PM	35	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:15 PM	5	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:15 PM	10	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:44 PM	83	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:30:44 PM	47	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:30:44 PM	52	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:30:44 PM	12	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:30:44 PM	29	1292.00	TQEX
GENMAB A/S	03-Apr-2025	16:30:44 PM	82	1292.50	CEUX
GENMAB A/S	03-Apr-2025	16:30:44 PM	8	1291.50	CEUX
GENMAB A/S	03-Apr-2025	16:30:44 PM	12	1291.50	CEUX
GENMAB A/S	03-Apr-2025	16:30:44 PM	36	1292.00	AQEU
GENMAB A/S	03-Apr-2025	16:30:45 PM	18	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:45 PM	26	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:30:45 PM	67	1292.00	XCSE

58

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:30:52 PM	61	1292.50	XCSE
GENMAB A/S	03-Apr-2025	16:30:52 PM	10	1292.50	CEUX
GENMAB A/S	03-Apr-2025	16:30:52 PM	53	1292.50	CEUX
GENMAB A/S	03-Apr-2025	16:31:26 PM	9	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:31:26 PM	10	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:31:26 PM	84	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:31:27 PM	3	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:31:27 PM	17	1291.50	CEUX
GENMAB A/S	03-Apr-2025	16:31:28 PM	8	1291.00	TQEX
GENMAB A/S	03-Apr-2025	16:31:28 PM	16	1291.00	TQEX
GENMAB A/S	03-Apr-2025	16:31:38 PM	84	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:31:38 PM	6	1290.50	XCSE
GENMAB A/S	03-Apr-2025	16:31:38 PM	18	1290.50	XCSE
GENMAB A/S	03-Apr-2025	16:31:38 PM	32	1290.00	CEUX
GENMAB A/S	03-Apr-2025	16:31:38 PM	30	1290.00	CEUX
GENMAB A/S	03-Apr-2025	16:32:19 PM	55	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:32:27 PM	44	1290.00	CEUX
GENMAB A/S	03-Apr-2025	16:33:09 PM	38	1289.50	TQEX
GENMAB A/S	03-Apr-2025	16:33:09 PM	36	1290.00	CEUX
GENMAB A/S	03-Apr-2025	16:33:26 PM	26	1289.50	XCSE
GENMAB A/S	03-Apr-2025	16:33:36 PM	24	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:33:36 PM	52	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:33:36 PM	3	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:33:36 PM	3	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:33:36 PM	14	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:33:36 PM	26	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:33:36 PM	36	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:33:36 PM	36	1289.00	AQEU
GENMAB A/S	03-Apr-2025	16:33:49 PM	10	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:33:52 PM	17	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:34:14 PM	13	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:34:14 PM	45	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:34:14 PM	18	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:34:14 PM	8	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:34:14 PM	17	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:34:14 PM	39	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:35:27 PM	7	1290.00	CEUX
GENMAB A/S	03-Apr-2025	16:35:34 PM	40	1290.50	CEUX
GENMAB A/S	03-Apr-2025	16:35:34 PM	7	1290.50	CEUX
GENMAB A/S	03-Apr-2025	16:35:34 PM	28	1290.50	CEUX
GENMAB A/S	03-Apr-2025	16:35:34 PM	2	1290.50	CEUX
GENMAB A/S	03-Apr-2025	16:35:35 PM	40	1290.50	CEUX
GENMAB A/S	03-Apr-2025	16:35:35 PM	36	1290.50	CEUX
GENMAB A/S	03-Apr-2025	16:35:45 PM	9	1290.50	CEUX
GENMAB A/S	03-Apr-2025	16:36:13 PM	30	1292.00	XCSE

59

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:36:13 PM	3	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:13 PM	3	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:13 PM	52	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:13 PM	14	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:13 PM	43	1292.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:13 PM	11	1292.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:13 PM	1	1292.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:13 PM	29	1292.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:15 PM	10	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:15 PM	52	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:15 PM	30	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:15 PM	17	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:25 PM	94	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:25 PM	10	1292.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:28 PM	13	1292.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:29 PM	11	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:29 PM	17	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:29 PM	52	1292.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:37 PM	85	1291.50	XCSE
GENMAB A/S	03-Apr-2025	16:36:37 PM	111	1291.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:37 PM	88	1290.50	XCSE
GENMAB A/S	03-Apr-2025	16:36:37 PM	45	1290.50	XCSE
GENMAB A/S	03-Apr-2025	16:36:37 PM	52	1290.50	XCSE
GENMAB A/S	03-Apr-2025	16:36:37 PM	14	1290.50	XCSE
GENMAB A/S	03-Apr-2025	16:36:37 PM	27	1291.50	TQEX
GENMAB A/S	03-Apr-2025	16:36:37 PM	25	1290.50	TQEX
GENMAB A/S	03-Apr-2025	16:36:37 PM	88	1291.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:37 PM	39	1291.50	AQEU
GENMAB A/S	03-Apr-2025	16:36:37 PM	19	1290.50	AQEU
GENMAB A/S	03-Apr-2025	16:36:37 PM	7	1290.50	AQEU
GENMAB A/S	03-Apr-2025	16:36:41 PM	8	1290.50	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	50	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	52	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	3	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	3	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	3	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	46	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	10	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	10	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	5	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:44 PM	80	1290.00	CEUX
GENMAB A/S	03-Apr-2025	16:36:45 PM	30	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:45 PM	14	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:45 PM	40	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:36:59 PM	36	1290.00	XCSE

60

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:36:59 PM	38	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:19 PM	15	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:19 PM	43	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:19 PM	9	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:19 PM	8	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:19 PM	5	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:19 PM	9	1290.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:26 PM	24	1289.50	TQEX
GENMAB A/S	03-Apr-2025	16:37:29 PM	16	1289.50	XCSE
GENMAB A/S	03-Apr-2025	16:37:30 PM	85	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:37:45 PM	7	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:37:45 PM	2	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:37:46 PM	34	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:37:58 PM	25	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:37:58 PM	14	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:37:58 PM	29	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:37:58 PM	32	1288.50	TQEX
GENMAB A/S	03-Apr-2025	16:37:58 PM	49	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:38:18 PM	11	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:38:18 PM	27	1289.00	XCSE
GENMAB A/S	03-Apr-2025	16:39:13 PM	29	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:39:13 PM	40	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:39:13 PM	26	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:39:13 PM	45	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:39:13 PM	44	1289.00	AQEU
GENMAB A/S	03-Apr-2025	16:39:14 PM	36	1289.00	CEUX
GENMAB A/S	03-Apr-2025	16:39:21 PM	28	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:39:26 PM	36	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:39:45 PM	10	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:39:45 PM	32	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:39:59 PM	41	1288.00	TQEX
GENMAB A/S	03-Apr-2025	16:39:59 PM	6	1288.00	TQEX
GENMAB A/S	03-Apr-2025	16:40:23 PM	12	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:23 PM	18	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:23 PM	25	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:23 PM	25	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:40:34 PM	27	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:34 PM	23	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:34 PM	1	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:34 PM	10	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:34 PM	1	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:34 PM	58	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:40:34 PM	9	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:40:40 PM	36	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:40:48 PM	30	1288.50	XCSE

61

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:40:48 PM	14	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	52	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	11	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	4	1288.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	1	1288.00	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	45	1288.00	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	10	1288.00	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	29	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:40:48 PM	36	1288.50	CEUX
GENMAB A/S	03-Apr-2025	16:40:50 PM	1	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:05 PM	11	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:05 PM	43	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:05 PM	26	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:05 PM	3	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:41:05 PM	33	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:41:05 PM	23	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:41:05 PM	16	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:41:06 PM	18	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:10 PM	11	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:10 PM	79	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:11 PM	18	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:26 PM	3	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:41:26 PM	67	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:41:26 PM	24	1287.50	TQEX
GENMAB A/S	03-Apr-2025	16:41:45 PM	88	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:41:51 PM	9	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:42:29 PM	15	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:42:29 PM	1	1287.50	TQEX
GENMAB A/S	03-Apr-2025	16:42:29 PM	25	1287.50	TQEX
GENMAB A/S	03-Apr-2025	16:42:29 PM	76	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:42:29 PM	13	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:42:35 PM	9	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:42:35 PM	27	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:42:55 PM	35	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:42:55 PM	13	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:43:05 PM	43	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:43:05 PM	14	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:43:05 PM	2	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:43:05 PM	30	1287.00	AQEU
GENMAB A/S	03-Apr-2025	16:43:15 PM	23	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:43:15 PM	34	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:43:15 PM	21	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:43:19 PM	44	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:43:19 PM	3	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:43:39 PM	35	1287.00	XCSE

62

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:43:39 PM	36	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:43:40 PM	14	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:43:40 PM	26	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:44:04 PM	51	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:44:05 PM	20	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:44:05 PM	52	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:44:05 PM	10	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:44:05 PM	32	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:44:05 PM	3	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:44:09 PM	7	1287.00	AQEU
GENMAB A/S	03-Apr-2025	16:44:11 PM	1	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:45:26 PM	27	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:26 PM	40	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:26 PM	2	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:26 PM	39	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:27 PM	8	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:27 PM	16	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:28 PM	40	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:29 PM	40	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:29 PM	24	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:29 PM	36	1288.00	CEUX
GENMAB A/S	03-Apr-2025	16:45:39 PM	52	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:45:39 PM	18	1287.50	XCSE
GENMAB A/S	03-Apr-2025	16:45:39 PM	29	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:45:39 PM	34	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:45:39 PM	32	1287.50	CEUX
GENMAB A/S	03-Apr-2025	16:45:42 PM	6	1287.00	XCSE
GENMAB A/S	03-Apr-2025	16:45:46 PM	24	1287.00	TQEX
GENMAB A/S	03-Apr-2025	16:45:46 PM	24	1287.00	AQEU
GENMAB A/S	03-Apr-2025	16:46:05 PM	13	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:46:05 PM	44	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:46:05 PM	10	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:46:13 PM	31	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:46:14 PM	3	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:46:14 PM	3	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:46:14 PM	21	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:46:25 PM	10	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:46:25 PM	25	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:46:43 PM	30	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:46:43 PM	37	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:46:43 PM	61	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:46:43 PM	13	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:46:43 PM	43	1286.00	TQEX
GENMAB A/S	03-Apr-2025	16:46:43 PM	40	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:46:43 PM	19	1286.00	AQEU

63

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:46:43 PM	7	1286.00	AQEU
GENMAB A/S	03-Apr-2025	16:46:45 PM	23	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:46:55 PM	39	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:46:55 PM	7	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:47:05 PM	15	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:47:15 PM	43	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:47:15 PM	1	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:47:25 PM	28	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:47:25 PM	14	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:47:25 PM	25	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:47:26 PM	2	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:47:29 PM	61	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:47:38 PM	20	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:47:38 PM	3	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:47:38 PM	10	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:47:59 PM	27	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:47:59 PM	4	1286.50	TQEX
GENMAB A/S	03-Apr-2025	16:47:59 PM	40	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:47:59 PM	25	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:48:01 PM	40	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:48:08 PM	15	1285.50	TQEX
GENMAB A/S	03-Apr-2025	16:48:08 PM	15	1285.50	AQEU
GENMAB A/S	03-Apr-2025	16:48:08 PM	7	1285.50	AQEU
GENMAB A/S	03-Apr-2025	16:48:24 PM	9	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:48:24 PM	32	1285.50	TQEX
GENMAB A/S	03-Apr-2025	16:48:24 PM	41	1285.50	AQEU
GENMAB A/S	03-Apr-2025	16:48:25 PM	24	1285.50	CEUX
GENMAB A/S	03-Apr-2025	16:48:29 PM	12	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:48:29 PM	48	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:48:29 PM	36	1285.50	CEUX
GENMAB A/S	03-Apr-2025	16:48:35 PM	9	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:48:35 PM	6	1285.50	CEUX
GENMAB A/S	03-Apr-2025	16:49:02 PM	34	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:49:02 PM	13	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:21 PM	52	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:49:21 PM	10	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:21 PM	33	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:21 PM	11	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:21 PM	40	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:21 PM	9	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:46 PM	26	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:49:46 PM	16	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:49:46 PM	10	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:49:46 PM	5	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:49:46 PM	24	1286.00	XCSE

64

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:49:46 PM	35	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:46 PM	2	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:46 PM	38	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:46 PM	14	1286.00	AQEU
GENMAB A/S	03-Apr-2025	16:49:47 PM	14	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:49:56 PM	38	1286.50	AQEU
GENMAB A/S	03-Apr-2025	16:50:03 PM	20	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:50:03 PM	32	1286.50	TQEX
GENMAB A/S	03-Apr-2025	16:50:03 PM	15	1286.50	TQEX
GENMAB A/S	03-Apr-2025	16:50:03 PM	38	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:50:03 PM	40	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:50:08 PM	47	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:25 PM	13	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:25 PM	50	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:35 PM	48	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:45 PM	11	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:45 PM	3	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:45 PM	10	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:45 PM	15	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:48 PM	35	1287.00	TQEX
GENMAB A/S	03-Apr-2025	16:50:55 PM	15	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:50:55 PM	13	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:05 PM	4	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:05 PM	47	1287.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:10 PM	1	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:51:10 PM	19	1286.50	TQEX
GENMAB A/S	03-Apr-2025	16:51:10 PM	14	1286.50	AQEU
GENMAB A/S	03-Apr-2025	16:51:11 PM	25	1286.50	XCSE
GENMAB A/S	03-Apr-2025	16:51:15 PM	24	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:51:15 PM	14	1286.50	AQEU
GENMAB A/S	03-Apr-2025	16:51:15 PM	15	1286.50	AQEU
GENMAB A/S	03-Apr-2025	16:51:25 PM	3	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:51:26 PM	10	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:26 PM	28	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:26 PM	10	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:26 PM	15	1286.50	TQEX
GENMAB A/S	03-Apr-2025	16:51:26 PM	9	1286.50	TQEX
GENMAB A/S	03-Apr-2025	16:51:26 PM	32	1286.50	CEUX
GENMAB A/S	03-Apr-2025	16:51:31 PM	33	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:31 PM	52	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:31 PM	14	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:31 PM	29	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:31 PM	32	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:31 PM	14	1286.00	AQEU
GENMAB A/S	03-Apr-2025	16:51:32 PM	38	1286.00	XCSE

65

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:51:32 PM	17	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:32 PM	29	1286.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:41 PM	15	1286.00	AQEU
GENMAB A/S	03-Apr-2025	16:51:45 PM	5	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:45 PM	39	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:45 PM	25	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:55 PM	15	1286.00	TQEX
GENMAB A/S	03-Apr-2025	16:51:55 PM	42	1286.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:56 PM	52	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:51:56 PM	30	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:51:56 PM	14	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:51:56 PM	4	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:51:56 PM	35	1285.50	TQEX
GENMAB A/S	03-Apr-2025	16:51:56 PM	28	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:51:56 PM	25	1285.50	AQEU
GENMAB A/S	03-Apr-2025	16:51:56 PM	11	1285.50	AQEU
GENMAB A/S	03-Apr-2025	16:52:05 PM	24	1284.50	TQEX
GENMAB A/S	03-Apr-2025	16:52:05 PM	20	1284.50	AQEU
GENMAB A/S	03-Apr-2025	16:52:05 PM	1	1284.50	AQEU
GENMAB A/S	03-Apr-2025	16:52:05 PM	6	1284.50	AQEU
GENMAB A/S	03-Apr-2025	16:52:06 PM	35	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:52:06 PM	24	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:52:06 PM	11	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:52:08 PM	17	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:52:08 PM	10	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:52:15 PM	10	1284.50	CEUX
GENMAB A/S	03-Apr-2025	16:52:19 PM	41	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:52:20 PM	6	1284.50	CEUX
GENMAB A/S	03-Apr-2025	16:52:25 PM	3	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:52:25 PM	26	1284.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:00 PM	52	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:00 PM	15	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:00 PM	3	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:00 PM	3	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:00 PM	10	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:00 PM	12	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:05 PM	27	1285.00	TQEX
GENMAB A/S	03-Apr-2025	16:53:05 PM	71	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:27 PM	52	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:27 PM	38	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:27 PM	21	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:27 PM	37	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:27 PM	42	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:27 PM	24	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:27 PM	18	1285.00	CEUX

66

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:53:27 PM	15	1285.00	AQEU
GENMAB A/S	03-Apr-2025	16:53:27 PM	2	1285.00	AQEU
GENMAB A/S	03-Apr-2025	16:53:28 PM	5	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:32 PM	10	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:34 PM	13	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:34 PM	12	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:40 PM	25	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:40 PM	38	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:40 PM	36	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:40 PM	7	1284.50	CEUX
GENMAB A/S	03-Apr-2025	16:53:40 PM	46	1284.50	CEUX
GENMAB A/S	03-Apr-2025	16:53:40 PM	14	1284.50	CEUX
GENMAB A/S	03-Apr-2025	16:53:40 PM	24	1284.50	AQEU
GENMAB A/S	03-Apr-2025	16:53:44 PM	9	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:44 PM	23	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:44 PM	38	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:44 PM	41	1285.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:44 PM	2	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:44 PM	36	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:44 PM	26	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:45 PM	7	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:45 PM	32	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:47 PM	32	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:53:48 PM	12	1284.50	AQEU
GENMAB A/S	03-Apr-2025	16:53:49 PM	42	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:52 PM	41	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:53:52 PM	23	1284.50	AQEU
GENMAB A/S	03-Apr-2025	16:53:56 PM	26	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:56 PM	10	1285.00	XCSE
GENMAB A/S	03-Apr-2025	16:53:59 PM	39	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:08 PM	17	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:54:08 PM	10	1285.00	CEUX
GENMAB A/S	03-Apr-2025	16:54:18 PM	27	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:19 PM	22	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:19 PM	30	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:20 PM	27	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:20 PM	15	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:23 PM	8	1284.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:37 PM	8	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:37 PM	17	1284.00	TQEX
GENMAB A/S	03-Apr-2025	16:54:37 PM	2	1284.00	TQEX
GENMAB A/S	03-Apr-2025	16:54:37 PM	5	1284.00	TQEX
GENMAB A/S	03-Apr-2025	16:54:38 PM	38	1283.50	XCSE
GENMAB A/S	03-Apr-2025	16:54:38 PM	10	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:40 PM	43	1283.50	XCSE

67

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	03-Apr-2025	16:54:40 PM	41	1283.50	CEUX
GENMAB A/S	03-Apr-2025	16:54:44 PM	14	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:44 PM	6	1284.00	CEUX
GENMAB A/S	03-Apr-2025	16:54:45 PM	2	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:45 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:48 PM	3	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:48 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:49 PM	6	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:49 PM	3	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:49 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:49 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:50 PM	5	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:50 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:53 PM	8	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:53 PM	1	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:53 PM	2	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:56 PM	13	1284.00	XCSE
GENMAB A/S	03-Apr-2025	16:54:56 PM	2	1284.00	XCSE
GENMAB A/S	04-Apr-2025	09:46:20 AM	22	1288.50	XCSE
GENMAB A/S	04-Apr-2025	09:46:20 AM	58	1288.50	XCSE
GENMAB A/S	04-Apr-2025	09:46:20 AM	80	1288.50	AQEU
GENMAB A/S	04-Apr-2025	09:46:28 AM	25	1287.50	XCSE
GENMAB A/S	04-Apr-2025	09:46:28 AM	52	1287.50	XCSE
GENMAB A/S	04-Apr-2025	09:46:28 AM	80	1288.00	TQEX
GENMAB A/S	04-Apr-2025	09:46:28 AM	76	1288.00	CEUX
GENMAB A/S	04-Apr-2025	09:46:28 AM	70	1287.50	AQEU
GENMAB A/S	04-Apr-2025	09:46:47 AM	25	1289.50	XCSE
GENMAB A/S	04-Apr-2025	09:46:47 AM	23	1289.50	TQEX
GENMAB A/S	04-Apr-2025	09:46:47 AM	24	1289.50	AQEU
GENMAB A/S	04-Apr-2025	09:46:48 AM	24	1289.50	CEUX
GENMAB A/S	04-Apr-2025	09:46:48 AM	5	1289.50	CEUX
GENMAB A/S	04-Apr-2025	09:47:17 AM	8	1291.50	CEUX
GENMAB A/S	04-Apr-2025	09:47:32 AM	59	1291.50	XCSE
GENMAB A/S	04-Apr-2025	09:47:32 AM	42	1291.50	TQEX
GENMAB A/S	04-Apr-2025	09:47:32 AM	30	1291.50	CEUX
GENMAB A/S	04-Apr-2025	09:47:32 AM	27	1291.00	AQEU
GENMAB A/S	04-Apr-2025	09:47:38 AM	38	1290.50	XCSE
GENMAB A/S	04-Apr-2025	09:47:38 AM	39	1289.50	XCSE
GENMAB A/S	04-Apr-2025	09:47:38 AM	35	1290.50	TQEX
GENMAB A/S	04-Apr-2025	09:47:38 AM	45	1289.50	TQEX
GENMAB A/S	04-Apr-2025	09:47:38 AM	26	1290.50	CEUX
GENMAB A/S	04-Apr-2025	09:47:38 AM	43	1289.50	CEUX
GENMAB A/S	04-Apr-2025	09:49:24 AM	37	1293.00	XCSE
GENMAB A/S	04-Apr-2025	09:49:24 AM	22	1293.00	XCSE
GENMAB A/S	04-Apr-2025	09:49:24 AM	26	1293.00	XCSE

68

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	09:49:24 AM	43	1293.00	CEUX
GENMAB A/S	04-Apr-2025	09:49:24 AM	24	1293.00	CEUX
GENMAB A/S	04-Apr-2025	09:49:25 AM	84	1292.00	XCSE
GENMAB A/S	04-Apr-2025	09:49:25 AM	64	1292.00	CEUX
GENMAB A/S	04-Apr-2025	09:49:33 AM	86	1292.00	XCSE
GENMAB A/S	04-Apr-2025	09:52:11 AM	60	1292.00	CEUX
GENMAB A/S	04-Apr-2025	09:52:12 AM	86	1292.00	XCSE
GENMAB A/S	04-Apr-2025	09:53:09 AM	90	1291.00	XCSE
GENMAB A/S	04-Apr-2025	09:53:09 AM	60	1291.00	CEUX
GENMAB A/S	04-Apr-2025	09:53:37 AM	88	1290.00	XCSE
GENMAB A/S	04-Apr-2025	09:53:37 AM	33	1289.50	CEUX
GENMAB A/S	04-Apr-2025	09:55:06 AM	46	1289.00	XCSE
GENMAB A/S	04-Apr-2025	09:55:06 AM	74	1289.50	CEUX
GENMAB A/S	04-Apr-2025	09:55:22 AM	49	1288.50	CEUX
GENMAB A/S	04-Apr-2025	09:56:35 AM	68	1288.50	CEUX
GENMAB A/S	04-Apr-2025	09:56:42 AM	41	1287.50	XCSE
GENMAB A/S	04-Apr-2025	09:56:42 AM	37	1287.50	CEUX
GENMAB A/S	04-Apr-2025	09:57:57 AM	79	1287.00	XCSE
GENMAB A/S	04-Apr-2025	09:57:57 AM	17	1286.00	XCSE
GENMAB A/S	04-Apr-2025	09:58:38 AM	79	1287.00	XCSE
GENMAB A/S	04-Apr-2025	09:59:26 AM	13	1286.00	XCSE
GENMAB A/S	04-Apr-2025	09:59:26 AM	12	1286.00	XCSE
GENMAB A/S	04-Apr-2025	10:01:19 AM	87	1287.00	XCSE
GENMAB A/S	04-Apr-2025	10:01:19 AM	76	1287.00	CEUX
GENMAB A/S	04-Apr-2025	10:01:19 AM	27	1287.00	AQEU
GENMAB A/S	04-Apr-2025	10:02:11 AM	83	1288.50	XCSE
GENMAB A/S	04-Apr-2025	10:02:18 AM	85	1288.00	XCSE
GENMAB A/S	04-Apr-2025	10:02:18 AM	87	1288.50	CEUX
GENMAB A/S	04-Apr-2025	10:02:30 AM	75	1287.00	XCSE
GENMAB A/S	04-Apr-2025	10:03:36 AM	46	1289.00	XCSE
GENMAB A/S	04-Apr-2025	10:03:36 AM	37	1289.00	XCSE
GENMAB A/S	04-Apr-2025	10:03:36 AM	16	1289.00	XCSE
GENMAB A/S	04-Apr-2025	10:03:36 AM	8	1289.00	XCSE
GENMAB A/S	04-Apr-2025	10:03:36 AM	6	1289.00	XCSE
GENMAB A/S	04-Apr-2025	10:04:05 AM	84	1288.00	XCSE
GENMAB A/S	04-Apr-2025	10:04:05 AM	8	1288.00	CEUX
GENMAB A/S	04-Apr-2025	10:04:05 AM	82	1288.00	CEUX
GENMAB A/S	04-Apr-2025	10:04:27 AM	14	1287.00	XCSE
GENMAB A/S	04-Apr-2025	10:04:27 AM	71	1287.00	CEUX
GENMAB A/S	04-Apr-2025	10:05:33 AM	85	1287.50	CEUX
GENMAB A/S	04-Apr-2025	10:05:49 AM	29	1287.00	XCSE
GENMAB A/S	04-Apr-2025	10:05:49 AM	56	1287.00	XCSE
GENMAB A/S	04-Apr-2025	10:06:14 AM	86	1286.00	XCSE
GENMAB A/S	04-Apr-2025	10:06:14 AM	10	1286.00	CEUX
GENMAB A/S	04-Apr-2025	10:06:14 AM	47	1286.00	CEUX

69

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	10:06:32 AM	45	1286.00	XCSE
GENMAB A/S	04-Apr-2025	10:06:32 AM	34	1286.00	XCSE
GENMAB A/S	04-Apr-2025	10:06:49 AM	15	1285.00	CEUX
GENMAB A/S	04-Apr-2025	10:06:49 AM	72	1285.00	CEUX
GENMAB A/S	04-Apr-2025	10:07:07 AM	89	1284.50	XCSE
GENMAB A/S	04-Apr-2025	10:07:51 AM	85	1283.50	XCSE
GENMAB A/S	04-Apr-2025	10:07:51 AM	27	1284.00	XCSE
GENMAB A/S	04-Apr-2025	10:07:51 AM	20	1283.50	CEUX
GENMAB A/S	04-Apr-2025	10:07:51 AM	23	1283.50	CEUX
GENMAB A/S	04-Apr-2025	10:09:12 AM	33	1286.00	XCSE
GENMAB A/S	04-Apr-2025	10:09:27 AM	88	1287.50	XCSE
GENMAB A/S	04-Apr-2025	10:09:27 AM	46	1287.50	XCSE
GENMAB A/S	04-Apr-2025	10:09:27 AM	37	1287.50	XCSE
GENMAB A/S	04-Apr-2025	10:09:27 AM	20	1287.50	XCSE
GENMAB A/S	04-Apr-2025	10:09:27 AM	72	1287.50	CEUX
GENMAB A/S	04-Apr-2025	10:09:27 AM	16	1287.50	CEUX
GENMAB A/S	04-Apr-2025	10:09:36 AM	26	1288.50	TQEX
GENMAB A/S	04-Apr-2025	10:09:57 AM	89	1288.00	XCSE
GENMAB A/S	04-Apr-2025	10:09:57 AM	26	1288.00	TQEX
GENMAB A/S	04-Apr-2025	10:09:57 AM	23	1288.00	CEUX
GENMAB A/S	04-Apr-2025	10:10:07 AM	86	1287.00	XCSE
GENMAB A/S	04-Apr-2025	10:10:07 AM	86	1286.00	XCSE
GENMAB A/S	04-Apr-2025	10:10:07 AM	34	1286.50	TQEX
GENMAB A/S	04-Apr-2025	10:10:07 AM	61	1287.00	CEUX
GENMAB A/S	04-Apr-2025	10:10:07 AM	85	1286.00	CEUX
GENMAB A/S	04-Apr-2025	10:10:50 AM	25	1285.50	TQEX
GENMAB A/S	04-Apr-2025	10:11:10 AM	85	1284.50	XCSE
GENMAB A/S	04-Apr-2025	10:11:10 AM	9	1284.50	CEUX
GENMAB A/S	04-Apr-2025	10:11:10 AM	26	1284.50	CEUX
GENMAB A/S	04-Apr-2025	10:11:21 AM	85	1283.50	XCSE
GENMAB A/S	04-Apr-2025	10:11:54 AM	15	1283.00	TQEX
GENMAB A/S	04-Apr-2025	10:13:20 AM	84	1285.00	XCSE
GENMAB A/S	04-Apr-2025	10:13:20 AM	32	1285.00	CEUX
GENMAB A/S	04-Apr-2025	10:13:23 AM	32	1284.50	TQEX
GENMAB A/S	04-Apr-2025	10:13:27 AM	88	1284.00	XCSE
GENMAB A/S	04-Apr-2025	10:13:27 AM	19	1284.00	CEUX
GENMAB A/S	04-Apr-2025	10:13:27 AM	15	1284.00	CEUX
GENMAB A/S	04-Apr-2025	10:13:40 AM	15	1284.00	CEUX
GENMAB A/S	04-Apr-2025	10:15:54 AM	50	1284.00	XCSE
GENMAB A/S	04-Apr-2025	10:15:54 AM	37	1284.00	XCSE
GENMAB A/S	04-Apr-2025	10:15:54 AM	24	1284.00	TQEX
GENMAB A/S	04-Apr-2025	10:15:54 AM	11	1284.00	CEUX
GENMAB A/S	04-Apr-2025	10:16:00 AM	33	1285.00	XCSE
GENMAB A/S	04-Apr-2025	10:16:08 AM	90	1284.00	XCSE
GENMAB A/S	04-Apr-2025	10:16:08 AM	48	1284.00	CEUX

70

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	10:16:27 AM	90	1284.00	XCSE
GENMAB A/S	04-Apr-2025	10:17:07 AM	31	1284.50	XCSE
GENMAB A/S	04-Apr-2025	10:17:07 AM	56	1284.50	XCSE
GENMAB A/S	04-Apr-2025	10:17:07 AM	44	1284.50	CEUX
GENMAB A/S	04-Apr-2025	10:17:25 AM	10	1285.00	XCSE
GENMAB A/S	04-Apr-2025	10:19:50 AM	11	1292.00	XCSE
GENMAB A/S	04-Apr-2025	10:20:28 AM	21	1294.00	XCSE
GENMAB A/S	04-Apr-2025	10:20:28 AM	26	1294.00	XCSE
GENMAB A/S	04-Apr-2025	10:20:28 AM	82	1293.50	CEUX
GENMAB A/S	04-Apr-2025	10:21:29 AM	86	1294.00	XCSE
GENMAB A/S	04-Apr-2025	10:21:34 AM	63	1293.50	CEUX
GENMAB A/S	04-Apr-2025	10:21:36 AM	90	1293.00	XCSE
GENMAB A/S	04-Apr-2025	10:21:36 AM	17	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:21:36 AM	24	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:21:36 AM	2	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:21:36 AM	37	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:21:36 AM	32	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:21:36 AM	1	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:22:00 AM	12	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:22:00 AM	15	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:22:00 AM	24	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:22:00 AM	37	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:22:00 AM	16	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:22:00 AM	9	1293.50	XCSE
GENMAB A/S	04-Apr-2025	10:22:34 AM	2	1295.00	CEUX
GENMAB A/S	04-Apr-2025	10:22:34 AM	23	1295.00	CEUX
GENMAB A/S	04-Apr-2025	10:22:45 AM	86	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:25:08 AM	30	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:25:08 AM	16	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:25:08 AM	37	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:25:08 AM	4	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:25:09 AM	40	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:26:49 AM	24	1296.50	TQEX
GENMAB A/S	04-Apr-2025	10:27:37 AM	25	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:27:37 AM	12	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:27:37 AM	53	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:27:37 AM	46	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:27:37 AM	40	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:27:37 AM	15	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:29:14 AM	14	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:29:14 AM	16	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:29:17 AM	14	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:29:17 AM	16	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:29:17 AM	15	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:29:17 AM	7	1298.50	XCSE

71

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	10:29:58 AM	6	1297.00	XCSE
GENMAB A/S	04-Apr-2025	10:29:58 AM	26	1297.00	XCSE
GENMAB A/S	04-Apr-2025	10:29:58 AM	56	1297.00	XCSE
GENMAB A/S	04-Apr-2025	10:29:58 AM	24	1297.00	CEUX
GENMAB A/S	04-Apr-2025	10:30:15 AM	86	1298.00	CEUX
GENMAB A/S	04-Apr-2025	10:30:21 AM	31	1298.00	XCSE
GENMAB A/S	04-Apr-2025	10:30:21 AM	29	1297.50	TQEX
GENMAB A/S	04-Apr-2025	10:30:21 AM	12	1297.50	TQEX
GENMAB A/S	04-Apr-2025	10:31:13 AM	10	1297.00	XCSE
GENMAB A/S	04-Apr-2025	10:31:18 AM	36	1297.00	XCSE
GENMAB A/S	04-Apr-2025	10:31:41 AM	42	1297.00	XCSE
GENMAB A/S	04-Apr-2025	10:32:21 AM	33	1299.50	XCSE
GENMAB A/S	04-Apr-2025	10:32:27 AM	35	1299.00	XCSE
GENMAB A/S	04-Apr-2025	10:32:27 AM	54	1299.00	XCSE
GENMAB A/S	04-Apr-2025	10:32:28 AM	34	1298.50	CEUX
GENMAB A/S	04-Apr-2025	10:32:28 AM	53	1298.50	CEUX
GENMAB A/S	04-Apr-2025	10:33:53 AM	75	1299.00	CEUX
GENMAB A/S	04-Apr-2025	10:33:53 AM	13	1299.00	CEUX
GENMAB A/S	04-Apr-2025	10:33:54 AM	10	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:33:54 AM	78	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:33:54 AM	37	1299.00	XCSE
GENMAB A/S	04-Apr-2025	10:33:54 AM	30	1299.00	XCSE
GENMAB A/S	04-Apr-2025	10:33:54 AM	23	1299.00	XCSE
GENMAB A/S	04-Apr-2025	10:33:54 AM	26	1298.50	TQEX
GENMAB A/S	04-Apr-2025	10:34:00 AM	86	1298.50	XCSE
GENMAB A/S	04-Apr-2025	10:34:01 AM	18	1298.00	CEUX
GENMAB A/S	04-Apr-2025	10:34:02 AM	67	1298.00	CEUX
GENMAB A/S	04-Apr-2025	10:34:10 AM	27	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:34:10 AM	62	1297.50	XCSE
GENMAB A/S	04-Apr-2025	10:34:28 AM	44	1297.00	CEUX
GENMAB A/S	04-Apr-2025	10:34:28 AM	18	1297.00	CEUX
GENMAB A/S	04-Apr-2025	10:35:49 AM	20	1296.00	XCSE
GENMAB A/S	04-Apr-2025	10:35:49 AM	25	1296.00	XCSE
GENMAB A/S	04-Apr-2025	10:37:49 AM	39	1296.00	XCSE
GENMAB A/S	04-Apr-2025	10:37:49 AM	90	1295.50	CEUX
GENMAB A/S	04-Apr-2025	10:40:28 AM	2	1294.50	XCSE
GENMAB A/S	04-Apr-2025	10:40:28 AM	78	1294.50	XCSE
GENMAB A/S	04-Apr-2025	10:40:28 AM	4	1294.50	XCSE
GENMAB A/S	04-Apr-2025	10:40:28 AM	89	1294.50	CEUX
GENMAB A/S	04-Apr-2025	10:40:42 AM	10	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:40:47 AM	26	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:40:47 AM	48	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:41:26 AM	89	1294.50	CEUX
GENMAB A/S	04-Apr-2025	10:41:44 AM	10	1294.50	XCSE
GENMAB A/S	04-Apr-2025	10:41:44 AM	13	1294.50	XCSE

72

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	10:42:03 AM	89	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:42:03 AM	70	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:42:03 AM	2	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:42:03 AM	3	1295.00	XCSE
GENMAB A/S	04-Apr-2025	10:42:03 AM	61	1294.50	CEUX
GENMAB A/S	04-Apr-2025	10:42:50 AM	84	1294.00	XCSE
GENMAB A/S	04-Apr-2025	10:42:50 AM	52	1293.00	XCSE
GENMAB A/S	04-Apr-2025	10:42:50 AM	55	1293.50	CEUX
GENMAB A/S	04-Apr-2025	10:45:07 AM	84	1299.00	XCSE
GENMAB A/S	04-Apr-2025	10:45:07 AM	51	1299.00	CEUX
GENMAB A/S	04-Apr-2025	10:45:07 AM	9	1299.00	CEUX
GENMAB A/S	04-Apr-2025	10:46:44 AM	83	1301.00	XCSE
GENMAB A/S	04-Apr-2025	10:46:44 AM	41	1301.00	TQEX
GENMAB A/S	04-Apr-2025	10:46:44 AM	3	1301.50	CEUX
GENMAB A/S	04-Apr-2025	10:46:44 AM	56	1301.50	CEUX
GENMAB A/S	04-Apr-2025	10:46:53 AM	87	1301.50	XCSE
GENMAB A/S	04-Apr-2025	10:47:40 AM	35	1303.50	TQEX
GENMAB A/S	04-Apr-2025	10:47:40 AM	44	1303.50	CEUX
GENMAB A/S	04-Apr-2025	10:47:40 AM	7	1303.50	CEUX
GENMAB A/S	04-Apr-2025	10:48:59 AM	62	1304.00	XCSE
GENMAB A/S	04-Apr-2025	10:48:59 AM	27	1304.00	XCSE
GENMAB A/S	04-Apr-2025	10:49:06 AM	7	1303.50	CEUX
GENMAB A/S	04-Apr-2025	10:49:06 AM	25	1303.50	CEUX
GENMAB A/S	04-Apr-2025	10:50:03 AM	86	1303.00	XCSE
GENMAB A/S	04-Apr-2025	10:50:30 AM	90	1305.50	XCSE
GENMAB A/S	04-Apr-2025	10:50:30 AM	60	1305.50	CEUX
GENMAB A/S	04-Apr-2025	10:51:09 AM	86	1304.50	XCSE
GENMAB A/S	04-Apr-2025	10:51:09 AM	55	1304.50	CEUX
GENMAB A/S	04-Apr-2025	10:51:24 AM	73	1303.50	XCSE
GENMAB A/S	04-Apr-2025	10:51:24 AM	14	1303.50	XCSE
GENMAB A/S	04-Apr-2025	10:51:24 AM	13	1303.50	CEUX
GENMAB A/S	04-Apr-2025	10:51:24 AM	38	1303.50	CEUX
GENMAB A/S	04-Apr-2025	10:51:24 AM	1	1303.50	CEUX
GENMAB A/S	04-Apr-2025	10:51:58 AM	82	1302.50	XCSE
GENMAB A/S	04-Apr-2025	10:52:45 AM	31	1302.00	CEUX
GENMAB A/S	04-Apr-2025	10:53:01 AM	1	1302.00	XCSE
GENMAB A/S	04-Apr-2025	10:53:01 AM	28	1302.00	XCSE
GENMAB A/S	04-Apr-2025	10:53:01 AM	10	1302.00	XCSE
GENMAB A/S	04-Apr-2025	10:53:47 AM	36	1302.00	XCSE
GENMAB A/S	04-Apr-2025	10:54:48 AM	46	1303.50	XCSE
GENMAB A/S	04-Apr-2025	10:54:48 AM	30	1303.50	TQEX
GENMAB A/S	04-Apr-2025	10:55:42 AM	45	1303.50	XCSE
GENMAB A/S	04-Apr-2025	10:55:42 AM	23	1303.50	TQEX
GENMAB A/S	04-Apr-2025	10:56:09 AM	7	1303.00	CEUX
GENMAB A/S	04-Apr-2025	10:56:09 AM	17	1303.00	CEUX

73

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	10:56:14 AM	42	1302.50	XCSE
GENMAB A/S	04-Apr-2025	10:56:14 AM	23	1302.00	CEUX
GENMAB A/S	04-Apr-2025	10:57:09 AM	47	1302.00	XCSE
GENMAB A/S	04-Apr-2025	10:57:09 AM	33	1302.00	CEUX
GENMAB A/S	04-Apr-2025	10:58:39 AM	23	1301.00	XCSE
GENMAB A/S	04-Apr-2025	10:58:39 AM	34	1300.50	TQEX
GENMAB A/S	04-Apr-2025	10:58:39 AM	26	1300.50	CEUX
GENMAB A/S	04-Apr-2025	10:59:02 AM	5	1300.50	CEUX
GENMAB A/S	04-Apr-2025	10:59:02 AM	23	1300.50	CEUX
GENMAB A/S	04-Apr-2025	10:59:03 AM	72	1300.50	XCSE
GENMAB A/S	04-Apr-2025	11:00:34 AM	11	1300.50	CEUX
GENMAB A/S	04-Apr-2025	11:01:48 AM	19	1300.50	CEUX
GENMAB A/S	04-Apr-2025	11:01:54 AM	44	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:01:54 AM	26	1299.50	TQEX
GENMAB A/S	04-Apr-2025	11:01:54 AM	32	1299.50	CEUX
GENMAB A/S	04-Apr-2025	11:02:01 AM	1	1300.50	TQEX
GENMAB A/S	04-Apr-2025	11:02:02 AM	24	1300.50	TQEX
GENMAB A/S	04-Apr-2025	11:03:15 AM	23	1301.00	TQEX
GENMAB A/S	04-Apr-2025	11:04:13 AM	37	1301.00	CEUX
GENMAB A/S	04-Apr-2025	11:04:27 AM	7	1300.50	XCSE
GENMAB A/S	04-Apr-2025	11:05:19 AM	78	1300.50	XCSE
GENMAB A/S	04-Apr-2025	11:05:19 AM	33	1300.50	AQEU
GENMAB A/S	04-Apr-2025	11:05:55 AM	28	1300.00	CEUX
GENMAB A/S	04-Apr-2025	11:05:59 AM	90	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:05:59 AM	27	1299.50	TQEX
GENMAB A/S	04-Apr-2025	11:06:00 AM	34	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:06:00 AM	25	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:06:02 AM	30	1298.00	TQEX
GENMAB A/S	04-Apr-2025	11:06:44 AM	90	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:07:04 AM	34	1297.50	CEUX
GENMAB A/S	04-Apr-2025	11:07:45 AM	27	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:07:45 AM	59	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:08:28 AM	21	1298.50	AQEU
GENMAB A/S	04-Apr-2025	11:08:28 AM	2	1298.50	AQEU
GENMAB A/S	04-Apr-2025	11:08:28 AM	49	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:09:04 AM	20	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:09:09 AM	17	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:09:10 AM	1	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:09:10 AM	84	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:09:27 AM	38	1297.50	CEUX
GENMAB A/S	04-Apr-2025	11:09:35 AM	37	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:09:35 AM	17	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:09:35 AM	29	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:09:35 AM	45	1296.00	XCSE
GENMAB A/S	04-Apr-2025	11:09:35 AM	68	1295.00	XCSE

74

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	11:09:35 AM	36	1296.00	CEUX
GENMAB A/S	04-Apr-2025	11:11:06 AM	23	1296.00	CEUX
GENMAB A/S	04-Apr-2025	11:12:22 AM	20	1294.50	CEUX
GENMAB A/S	04-Apr-2025	11:12:22 AM	6	1294.50	CEUX
GENMAB A/S	04-Apr-2025	11:12:43 AM	2	1295.00	CEUX
GENMAB A/S	04-Apr-2025	11:13:05 AM	21	1295.00	CEUX
GENMAB A/S	04-Apr-2025	11:13:07 AM	10	1294.50	XCSE
GENMAB A/S	04-Apr-2025	11:13:07 AM	21	1294.50	XCSE
GENMAB A/S	04-Apr-2025	11:13:07 AM	11	1294.50	XCSE
GENMAB A/S	04-Apr-2025	11:13:10 AM	24	1294.00	CEUX
GENMAB A/S	04-Apr-2025	11:14:37 AM	17	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:16:08 AM	9	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:16:08 AM	13	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:16:08 AM	67	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:16:36 AM	24	1299.50	TQEX
GENMAB A/S	04-Apr-2025	11:16:36 AM	22	1299.50	CEUX
GENMAB A/S	04-Apr-2025	11:16:36 AM	35	1299.50	CEUX
GENMAB A/S	04-Apr-2025	11:17:15 AM	26	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:17:15 AM	4	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:17:15 AM	55	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:17:16 AM	24	1298.50	AQEU
GENMAB A/S	04-Apr-2025	11:19:43 AM	86	1302.00	XCSE
GENMAB A/S	04-Apr-2025	11:19:43 AM	37	1302.00	XCSE
GENMAB A/S	04-Apr-2025	11:19:43 AM	17	1302.00	XCSE
GENMAB A/S	04-Apr-2025	11:19:43 AM	23	1302.00	TQEX
GENMAB A/S	04-Apr-2025	11:19:43 AM	56	1302.00	CEUX
GENMAB A/S	04-Apr-2025	11:19:43 AM	18	1301.00	CEUX
GENMAB A/S	04-Apr-2025	11:19:44 AM	74	1301.00	XCSE
GENMAB A/S	04-Apr-2025	11:19:44 AM	12	1301.00	XCSE
GENMAB A/S	04-Apr-2025	11:19:44 AM	52	1301.00	CEUX
GENMAB A/S	04-Apr-2025	11:19:45 AM	83	1300.00	XCSE
GENMAB A/S	04-Apr-2025	11:19:45 AM	50	1300.00	CEUX
GENMAB A/S	04-Apr-2025	11:19:45 AM	21	1300.00	CEUX
GENMAB A/S	04-Apr-2025	11:20:04 AM	41	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:20:38 AM	48	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:20:38 AM	35	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:20:38 AM	4	1298.50	AQEU
GENMAB A/S	04-Apr-2025	11:20:39 AM	24	1298.00	CEUX
GENMAB A/S	04-Apr-2025	11:25:13 AM	6	1300.50	XCSE
GENMAB A/S	04-Apr-2025	11:25:13 AM	15	1300.50	XCSE
GENMAB A/S	04-Apr-2025	11:25:14 AM	14	1301.50	XCSE
GENMAB A/S	04-Apr-2025	11:25:23 AM	24	1302.00	AQEU
GENMAB A/S	04-Apr-2025	11:25:30 AM	26	1302.00	XCSE
GENMAB A/S	04-Apr-2025	11:25:43 AM	9	1301.50	XCSE
GENMAB A/S	04-Apr-2025	11:25:43 AM	65	1301.50	XCSE

75

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	11:25:49 AM	88	1302.50	XCSE
GENMAB A/S	04-Apr-2025	11:25:49 AM	42	1302.50	CEUX
GENMAB A/S	04-Apr-2025	11:25:49 AM	17	1302.50	CEUX
GENMAB A/S	04-Apr-2025	11:26:25 AM	18	1301.50	XCSE
GENMAB A/S	04-Apr-2025	11:26:25 AM	50	1301.50	XCSE
GENMAB A/S	04-Apr-2025	11:26:25 AM	22	1301.50	XCSE
GENMAB A/S	04-Apr-2025	11:26:26 AM	27	1301.50	CEUX
GENMAB A/S	04-Apr-2025	11:26:26 AM	3	1301.50	CEUX
GENMAB A/S	04-Apr-2025	11:26:26 AM	38	1301.50	CEUX
GENMAB A/S	04-Apr-2025	11:26:27 AM	29	1301.00	AQEU
GENMAB A/S	04-Apr-2025	11:26:35 AM	18	1300.50	XCSE
GENMAB A/S	04-Apr-2025	11:26:35 AM	48	1300.50	XCSE
GENMAB A/S	04-Apr-2025	11:27:04 AM	86	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:27:04 AM	33	1300.00	CEUX
GENMAB A/S	04-Apr-2025	11:27:04 AM	25	1300.00	CEUX
GENMAB A/S	04-Apr-2025	11:27:04 AM	32	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:27:08 AM	20	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:27:08 AM	3	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:27:21 AM	30	1298.00	TQEX
GENMAB A/S	04-Apr-2025	11:27:59 AM	30	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:27:59 AM	50	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:29:21 AM	64	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:29:21 AM	23	1299.00	TQEX
GENMAB A/S	04-Apr-2025	11:29:24 AM	16	1298.00	CEUX
GENMAB A/S	04-Apr-2025	11:31:18 AM	10	1298.00	CEUX
GENMAB A/S	04-Apr-2025	11:31:33 AM	47	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:31:33 AM	25	1297.00	TQEX
GENMAB A/S	04-Apr-2025	11:31:33 AM	23	1297.00	CEUX
GENMAB A/S	04-Apr-2025	11:31:37 AM	55	1296.50	XCSE
GENMAB A/S	04-Apr-2025	11:33:18 AM	16	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:35:57 AM	20	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:36:09 AM	10	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:36:09 AM	5	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:36:10 AM	14	1300.00	XCSE
GENMAB A/S	04-Apr-2025	11:36:11 AM	36	1300.00	XCSE
GENMAB A/S	04-Apr-2025	11:36:11 AM	34	1300.00	XCSE
GENMAB A/S	04-Apr-2025	11:36:23 AM	63	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:36:23 AM	26	1299.50	TQEX
GENMAB A/S	04-Apr-2025	11:36:23 AM	89	1299.50	CEUX
GENMAB A/S	04-Apr-2025	11:36:32 AM	25	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:37:26 AM	59	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:39:20 AM	16	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:20 AM	19	1298.00	AQEU
GENMAB A/S	04-Apr-2025	11:39:28 AM	1	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:36 AM	3	1298.50	XCSE

76

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	11:39:36 AM	23	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:41 AM	16	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:41 AM	7	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:42 AM	16	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:42 AM	7	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:50 AM	15	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:50 AM	16	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:39:50 AM	5	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:40:03 AM	73	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:40:03 AM	5	1298.00	AQEU
GENMAB A/S	04-Apr-2025	11:40:03 AM	5	1297.50	CEUX
GENMAB A/S	04-Apr-2025	11:40:17 AM	50	1297.50	CEUX
GENMAB A/S	04-Apr-2025	11:40:17 AM	3	1297.50	CEUX
GENMAB A/S	04-Apr-2025	11:41:14 AM	20	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:41:14 AM	1	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:41:59 AM	68	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:42:00 AM	84	1296.50	XCSE
GENMAB A/S	04-Apr-2025	11:42:11 AM	20	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:42:11 AM	14	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:42:11 AM	48	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:42:11 AM	3	1297.00	XCSE
GENMAB A/S	04-Apr-2025	11:44:10 AM	54	1296.50	CEUX
GENMAB A/S	04-Apr-2025	11:44:57 AM	34	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:44:57 AM	2	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:44:57 AM	8	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:44:57 AM	41	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:44:57 AM	3	1295.50	CEUX
GENMAB A/S	04-Apr-2025	11:44:57 AM	28	1295.50	CEUX
GENMAB A/S	04-Apr-2025	11:44:57 AM	21	1295.50	CEUX
GENMAB A/S	04-Apr-2025	11:45:03 AM	16	1295.00	AQEU
GENMAB A/S	04-Apr-2025	11:45:03 AM	3	1295.00	AQEU
GENMAB A/S	04-Apr-2025	11:46:40 AM	73	1294.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:00 AM	8	1295.00	AQEU
GENMAB A/S	04-Apr-2025	11:49:20 AM	16	1294.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:59 AM	36	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:59 AM	9	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:59 AM	1	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:59 AM	17	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:59 AM	5	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:59 AM	32	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:49:59 AM	13	1295.50	XCSE
GENMAB A/S	04-Apr-2025	11:50:25 AM	86	1295.50	CEUX
GENMAB A/S	04-Apr-2025	11:50:59 AM	12	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:50:59 AM	3	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:50:59 AM	10	1298.50	XCSE

77

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	11:50:59 AM	8	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:50:59 AM	37	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:50:59 AM	32	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:50:59 AM	9	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:51:59 AM	15	1299.00	TQEX
GENMAB A/S	04-Apr-2025	11:51:59 AM	23	1299.00	AQEU
GENMAB A/S	04-Apr-2025	11:51:59 AM	36	1299.00	CEUX
GENMAB A/S	04-Apr-2025	11:51:59 AM	25	1299.00	CEUX
GENMAB A/S	04-Apr-2025	11:51:59 AM	1	1299.00	CEUX
GENMAB A/S	04-Apr-2025	11:52:25 AM	19	1299.00	TQEX
GENMAB A/S	04-Apr-2025	11:52:25 AM	27	1299.00	CEUX
GENMAB A/S	04-Apr-2025	11:52:47 AM	84	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:52:52 AM	24	1298.00	AQEU
GENMAB A/S	04-Apr-2025	11:52:52 AM	88	1298.00	CEUX
GENMAB A/S	04-Apr-2025	11:52:58 AM	82	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:52:58 AM	5	1297.50	XCSE
GENMAB A/S	04-Apr-2025	11:55:01 AM	88	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:55:01 AM	31	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:55:43 AM	10	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:55:43 AM	32	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:56:41 AM	5	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:56:41 AM	15	1298.00	XCSE
GENMAB A/S	04-Apr-2025	11:56:56 AM	35	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:56:56 AM	9	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:57:01 AM	50	1298.00	CEUX
GENMAB A/S	04-Apr-2025	11:57:40 AM	19	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:57:40 AM	14	1299.00	XCSE
GENMAB A/S	04-Apr-2025	11:58:29 AM	1	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:58:29 AM	1	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:58:29 AM	12	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:58:29 AM	14	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:58:29 AM	23	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:58:29 AM	4	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:59:20 AM	24	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:59:20 AM	3	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:59:20 AM	20	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:59:20 AM	37	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:59:20 AM	15	1299.50	XCSE
GENMAB A/S	04-Apr-2025	11:59:29 AM	89	1298.50	XCSE
GENMAB A/S	04-Apr-2025	11:59:29 AM	28	1298.50	TQEX
GENMAB A/S	04-Apr-2025	11:59:29 AM	24	1298.50	CEUX
GENMAB A/S	04-Apr-2025	11:59:44 AM	1	1298.50	AQEU
GENMAB A/S	04-Apr-2025	12:00:50 PM	19	1299.50	AQEU
GENMAB A/S	04-Apr-2025	12:01:08 PM	6	1299.00	XCSE
GENMAB A/S	04-Apr-2025	12:01:08 PM	25	1299.00	XCSE

78

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	12:01:08 PM	5	1299.50	AQEU
GENMAB A/S	04-Apr-2025	12:01:09 PM	58	1299.00	XCSE
GENMAB A/S	04-Apr-2025	12:02:51 PM	6	1298.00	CEUX
GENMAB A/S	04-Apr-2025	12:03:32 PM	15	1298.50	XCSE
GENMAB A/S	04-Apr-2025	12:03:32 PM	13	1298.50	XCSE
GENMAB A/S	04-Apr-2025	12:03:32 PM	19	1298.50	XCSE
GENMAB A/S	04-Apr-2025	12:03:32 PM	15	1298.50	XCSE
GENMAB A/S	04-Apr-2025	12:03:32 PM	32	1298.50	XCSE
GENMAB A/S	04-Apr-2025	12:03:51 PM	83	1298.50	XCSE
GENMAB A/S	04-Apr-2025	12:04:08 PM	24	1298.00	CEUX
GENMAB A/S	04-Apr-2025	12:04:08 PM	1	1298.00	CEUX
GENMAB A/S	04-Apr-2025	12:05:02 PM	84	1297.50	XCSE
GENMAB A/S	04-Apr-2025	12:05:02 PM	2	1296.50	XCSE
GENMAB A/S	04-Apr-2025	12:05:02 PM	10	1296.50	XCSE
GENMAB A/S	04-Apr-2025	12:05:02 PM	1	1296.50	XCSE
GENMAB A/S	04-Apr-2025	12:05:02 PM	34	1297.00	TQEX
GENMAB A/S	04-Apr-2025	12:05:02 PM	44	1298.00	CEUX
GENMAB A/S	04-Apr-2025	12:05:02 PM	12	1298.00	CEUX
GENMAB A/S	04-Apr-2025	12:05:02 PM	2	1297.00	CEUX
GENMAB A/S	04-Apr-2025	12:05:02 PM	85	1297.00	CEUX
GENMAB A/S	04-Apr-2025	12:05:03 PM	67	1296.50	XCSE
GENMAB A/S	04-Apr-2025	12:05:03 PM	9	1296.50	XCSE
GENMAB A/S	04-Apr-2025	12:05:51 PM	84	1296.00	XCSE
GENMAB A/S	04-Apr-2025	12:05:51 PM	43	1296.50	CEUX
GENMAB A/S	04-Apr-2025	12:05:51 PM	44	1296.50	CEUX
GENMAB A/S	04-Apr-2025	12:06:01 PM	83	1295.50	CEUX
GENMAB A/S	04-Apr-2025	12:06:22 PM	86	1295.00	XCSE
GENMAB A/S	04-Apr-2025	12:06:29 PM	9	1294.00	XCSE
GENMAB A/S	04-Apr-2025	12:06:29 PM	74	1294.00	XCSE
GENMAB A/S	04-Apr-2025	12:06:29 PM	4	1294.00	CEUX
GENMAB A/S	04-Apr-2025	12:06:29 PM	79	1294.00	CEUX
GENMAB A/S	04-Apr-2025	12:06:56 PM	72	1292.50	XCSE
GENMAB A/S	04-Apr-2025	12:06:56 PM	38	1292.50	CEUX
GENMAB A/S	04-Apr-2025	12:07:22 PM	24	1293.00	XCSE
GENMAB A/S	04-Apr-2025	12:07:27 PM	18	1292.50	AQEU
GENMAB A/S	04-Apr-2025	12:07:29 PM	34	1292.50	TQEX
GENMAB A/S	04-Apr-2025	12:07:29 PM	13	1292.50	AQEU
GENMAB A/S	04-Apr-2025	12:08:26 PM	17	1292.50	AQEU
GENMAB A/S	04-Apr-2025	12:08:38 PM	6	1292.50	AQEU
GENMAB A/S	04-Apr-2025	12:08:51 PM	11	1292.50	TQEX
GENMAB A/S	04-Apr-2025	12:08:51 PM	15	1292.50	TQEX
GENMAB A/S	04-Apr-2025	12:09:03 PM	24	1292.00	XCSE
GENMAB A/S	04-Apr-2025	12:09:39 PM	14	1292.50	XCSE
GENMAB A/S	04-Apr-2025	12:09:39 PM	10	1292.50	XCSE
GENMAB A/S	04-Apr-2025	12:10:11 PM	5	1292.50	XCSE

79

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	12:10:11 PM	43	1292.50	XCSE
GENMAB A/S	04-Apr-2025	12:10:41 PM	6	1292.00	XCSE
GENMAB A/S	04-Apr-2025	12:10:58 PM	67	1292.00	XCSE
GENMAB A/S	04-Apr-2025	12:11:03 PM	48	1291.00	XCSE
GENMAB A/S	04-Apr-2025	12:11:03 PM	24	1291.50	AQEU
GENMAB A/S	04-Apr-2025	12:11:03 PM	26	1291.50	CEUX
GENMAB A/S	04-Apr-2025	12:11:57 PM	53	1291.50	XCSE
GENMAB A/S	04-Apr-2025	12:11:57 PM	15	1292.00	TQEX
GENMAB A/S	04-Apr-2025	12:11:57 PM	11	1292.00	TQEX
GENMAB A/S	04-Apr-2025	12:14:17 PM	40	1292.00	XCSE
GENMAB A/S	04-Apr-2025	12:15:15 PM	51	1291.50	CEUX
GENMAB A/S	04-Apr-2025	12:15:32 PM	2	1290.50	XCSE
GENMAB A/S	04-Apr-2025	12:15:32 PM	37	1290.50	XCSE
GENMAB A/S	04-Apr-2025	12:15:32 PM	23	1290.50	CEUX
GENMAB A/S	04-Apr-2025	12:16:19 PM	23	1289.50	XCSE
GENMAB A/S	04-Apr-2025	12:16:19 PM	23	1289.50	CEUX
GENMAB A/S	04-Apr-2025	12:16:30 PM	70	1288.00	XCSE
GENMAB A/S	04-Apr-2025	12:17:29 PM	23	1288.50	AQEU
GENMAB A/S	04-Apr-2025	12:17:32 PM	71	1288.00	CEUX
GENMAB A/S	04-Apr-2025	12:17:46 PM	9	1287.00	XCSE
GENMAB A/S	04-Apr-2025	12:17:46 PM	70	1287.00	XCSE
GENMAB A/S	04-Apr-2025	12:18:03 PM	49	1288.00	CEUX
GENMAB A/S	04-Apr-2025	12:18:09 PM	1	1287.50	XCSE
GENMAB A/S	04-Apr-2025	12:18:09 PM	1	1287.50	XCSE
GENMAB A/S	04-Apr-2025	12:18:09 PM	74	1287.50	XCSE
GENMAB A/S	04-Apr-2025	12:18:09 PM	47	1287.00	CEUX
GENMAB A/S	04-Apr-2025	12:18:22 PM	24	1288.00	CEUX
GENMAB A/S	04-Apr-2025	12:18:50 PM	26	1288.50	XCSE
GENMAB A/S	04-Apr-2025	12:19:03 PM	39	1288.50	XCSE
GENMAB A/S	04-Apr-2025	12:19:20 PM	60	1288.50	XCSE
GENMAB A/S	04-Apr-2025	12:19:41 PM	14	1288.00	CEUX
GENMAB A/S	04-Apr-2025	12:19:41 PM	9	1288.00	CEUX
GENMAB A/S	04-Apr-2025	12:19:43 PM	27	1287.50	XCSE
GENMAB A/S	04-Apr-2025	12:19:43 PM	62	1286.50	XCSE
GENMAB A/S	04-Apr-2025	12:19:43 PM	8	1287.00	CEUX
GENMAB A/S	04-Apr-2025	12:19:43 PM	12	1287.00	CEUX
GENMAB A/S	04-Apr-2025	12:19:43 PM	3	1287.00	CEUX
GENMAB A/S	04-Apr-2025	12:20:04 PM	10	1286.00	CEUX
GENMAB A/S	04-Apr-2025	12:20:09 PM	5	1286.00	CEUX
GENMAB A/S	04-Apr-2025	12:20:09 PM	10	1286.00	CEUX
GENMAB A/S	04-Apr-2025	12:20:14 PM	25	1285.00	TQEX
GENMAB A/S	04-Apr-2025	12:20:25 PM	25	1284.00	XCSE
GENMAB A/S	04-Apr-2025	12:20:25 PM	23	1284.00	TQEX
GENMAB A/S	04-Apr-2025	12:20:49 PM	24	1283.00	XCSE
GENMAB A/S	04-Apr-2025	12:20:59 PM	25	1282.00	TQEX

80

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	12:20:59 PM	30	1282.00	CEUX
GENMAB A/S	04-Apr-2025	12:21:07 PM	15	1279.50	TQEX
GENMAB A/S	04-Apr-2025	12:21:13 PM	5	1280.00	XCSE
GENMAB A/S	04-Apr-2025	12:21:25 PM	3	1280.00	XCSE
GENMAB A/S	04-Apr-2025	12:21:25 PM	16	1280.00	XCSE
GENMAB A/S	04-Apr-2025	12:21:42 PM	23	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:21:42 PM	24	1279.50	CEUX
GENMAB A/S	04-Apr-2025	12:22:00 PM	24	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:22:22 PM	23	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:22:54 PM	27	1277.00	XCSE
GENMAB A/S	04-Apr-2025	12:22:54 PM	30	1277.00	TQEX
GENMAB A/S	04-Apr-2025	12:22:54 PM	24	1277.00	CEUX
GENMAB A/S	04-Apr-2025	12:23:49 PM	30	1276.00	XCSE
GENMAB A/S	04-Apr-2025	12:23:54 PM	23	1276.50	XCSE
GENMAB A/S	04-Apr-2025	12:24:31 PM	25	1277.50	XCSE
GENMAB A/S	04-Apr-2025	12:24:31 PM	15	1277.50	AQEU
GENMAB A/S	04-Apr-2025	12:24:39 PM	2	1277.50	AQEU
GENMAB A/S	04-Apr-2025	12:24:39 PM	6	1277.50	AQEU
GENMAB A/S	04-Apr-2025	12:24:39 PM	29	1277.00	CEUX
GENMAB A/S	04-Apr-2025	12:25:33 PM	29	1279.50	XCSE
GENMAB A/S	04-Apr-2025	12:25:33 PM	24	1279.50	CEUX
GENMAB A/S	04-Apr-2025	12:26:26 PM	6	1281.50	XCSE
GENMAB A/S	04-Apr-2025	12:26:26 PM	18	1281.50	XCSE
GENMAB A/S	04-Apr-2025	12:26:26 PM	26	1281.50	TQEX
GENMAB A/S	04-Apr-2025	12:26:26 PM	26	1281.50	CEUX
GENMAB A/S	04-Apr-2025	12:26:47 PM	29	1280.50	XCSE
GENMAB A/S	04-Apr-2025	12:27:44 PM	36	1282.50	XCSE
GENMAB A/S	04-Apr-2025	12:28:31 PM	30	1283.50	XCSE
GENMAB A/S	04-Apr-2025	12:28:31 PM	14	1283.50	CEUX
GENMAB A/S	04-Apr-2025	12:28:31 PM	13	1283.50	CEUX
GENMAB A/S	04-Apr-2025	12:29:08 PM	23	1283.00	CEUX
GENMAB A/S	04-Apr-2025	12:29:16 PM	30	1282.50	XCSE
GENMAB A/S	04-Apr-2025	12:29:31 PM	32	1281.50	XCSE
GENMAB A/S	04-Apr-2025	12:29:31 PM	27	1282.00	CEUX
GENMAB A/S	04-Apr-2025	12:29:37 PM	28	1280.50	XCSE
GENMAB A/S	04-Apr-2025	12:29:56 PM	25	1281.00	XCSE
GENMAB A/S	04-Apr-2025	12:30:25 PM	26	1281.00	XCSE
GENMAB A/S	04-Apr-2025	12:30:25 PM	23	1281.00	CEUX
GENMAB A/S	04-Apr-2025	12:33:10 PM	31	1284.50	XCSE
GENMAB A/S	04-Apr-2025	12:33:10 PM	32	1284.50	TQEX
GENMAB A/S	04-Apr-2025	12:33:10 PM	26	1284.50	CEUX
GENMAB A/S	04-Apr-2025	12:33:33 PM	19	1284.00	AQEU
GENMAB A/S	04-Apr-2025	12:33:33 PM	6	1284.00	AQEU
GENMAB A/S	04-Apr-2025	12:33:34 PM	17	1283.50	XCSE
GENMAB A/S	04-Apr-2025	12:33:34 PM	14	1283.50	XCSE

81

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	12:33:34 PM	34	1283.50	TQEX
GENMAB A/S	04-Apr-2025	12:33:34 PM	24	1283.50	CEUX
GENMAB A/S	04-Apr-2025	12:34:29 PM	24	1282.50	XCSE
GENMAB A/S	04-Apr-2025	12:35:47 PM	24	1282.00	CEUX
GENMAB A/S	04-Apr-2025	12:35:51 PM	18	1281.50	XCSE
GENMAB A/S	04-Apr-2025	12:35:51 PM	25	1281.50	XCSE
GENMAB A/S	04-Apr-2025	12:36:35 PM	57	1280.50	XCSE
GENMAB A/S	04-Apr-2025	12:36:35 PM	24	1280.50	CEUX
GENMAB A/S	04-Apr-2025	12:37:08 PM	40	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:37:40 PM	12	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:37:55 PM	40	1279.50	XCSE
GENMAB A/S	04-Apr-2025	12:37:55 PM	27	1279.50	XCSE
GENMAB A/S	04-Apr-2025	12:38:25 PM	35	1279.50	XCSE
GENMAB A/S	04-Apr-2025	12:40:14 PM	58	1283.50	XCSE
GENMAB A/S	04-Apr-2025	12:40:14 PM	24	1283.50	TQEX
GENMAB A/S	04-Apr-2025	12:40:41 PM	2	1284.50	XCSE
GENMAB A/S	04-Apr-2025	12:41:16 PM	23	1286.00	TQEX
GENMAB A/S	04-Apr-2025	12:41:16 PM	61	1286.00	CEUX
GENMAB A/S	04-Apr-2025	12:41:21 PM	15	1285.50	XCSE
GENMAB A/S	04-Apr-2025	12:41:21 PM	47	1285.50	XCSE
GENMAB A/S	04-Apr-2025	12:41:45 PM	40	1284.50	XCSE
GENMAB A/S	04-Apr-2025	12:41:59 PM	28	1285.00	TQEX
GENMAB A/S	04-Apr-2025	12:41:59 PM	21	1285.00	CEUX
GENMAB A/S	04-Apr-2025	12:42:05 PM	10	1285.00	CEUX
GENMAB A/S	04-Apr-2025	12:42:42 PM	14	1285.00	CEUX
GENMAB A/S	04-Apr-2025	12:42:42 PM	13	1285.00	CEUX
GENMAB A/S	04-Apr-2025	12:43:27 PM	1	1284.50	XCSE
GENMAB A/S	04-Apr-2025	12:43:27 PM	10	1284.50	XCSE
GENMAB A/S	04-Apr-2025	12:44:50 PM	43	1283.50	XCSE
GENMAB A/S	04-Apr-2025	12:44:50 PM	1	1284.00	CEUX
GENMAB A/S	04-Apr-2025	12:44:50 PM	1	1284.00	CEUX
GENMAB A/S	04-Apr-2025	12:44:50 PM	60	1284.00	CEUX
GENMAB A/S	04-Apr-2025	12:45:07 PM	26	1283.50	TQEX
GENMAB A/S	04-Apr-2025	12:45:10 PM	13	1283.00	CEUX
GENMAB A/S	04-Apr-2025	12:45:10 PM	20	1283.00	CEUX
GENMAB A/S	04-Apr-2025	12:45:27 PM	16	1282.50	XCSE
GENMAB A/S	04-Apr-2025	12:45:27 PM	27	1282.50	XCSE
GENMAB A/S	04-Apr-2025	12:45:52 PM	23	1282.00	CEUX
GENMAB A/S	04-Apr-2025	12:47:04 PM	1	1282.00	CEUX
GENMAB A/S	04-Apr-2025	12:47:35 PM	21	1281.50	XCSE
GENMAB A/S	04-Apr-2025	12:47:35 PM	23	1282.00	CEUX
GENMAB A/S	04-Apr-2025	12:47:41 PM	39	1281.50	XCSE
GENMAB A/S	04-Apr-2025	12:48:00 PM	72	1280.50	XCSE
GENMAB A/S	04-Apr-2025	12:48:12 PM	11	1280.50	CEUX
GENMAB A/S	04-Apr-2025	12:48:12 PM	18	1280.50	CEUX

82

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	12:49:46 PM	39	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:49:46 PM	21	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:49:46 PM	29	1279.00	CEUX
GENMAB A/S	04-Apr-2025	12:51:36 PM	89	1279.50	XCSE
GENMAB A/S	04-Apr-2025	12:51:51 PM	6	1279.50	TQEX
GENMAB A/S	04-Apr-2025	12:51:51 PM	37	1279.50	CEUX
GENMAB A/S	04-Apr-2025	12:52:10 PM	16	1278.50	XCSE
GENMAB A/S	04-Apr-2025	12:52:31 PM	71	1279.50	XCSE
GENMAB A/S	04-Apr-2025	12:52:57 PM	55	1278.50	XCSE
GENMAB A/S	04-Apr-2025	12:52:58 PM	23	1278.50	CEUX
GENMAB A/S	04-Apr-2025	12:53:22 PM	63	1277.50	XCSE
GENMAB A/S	04-Apr-2025	12:53:22 PM	31	1277.50	CEUX
GENMAB A/S	04-Apr-2025	12:55:07 PM	38	1278.50	XCSE
GENMAB A/S	04-Apr-2025	12:55:07 PM	26	1278.50	TQEX
GENMAB A/S	04-Apr-2025	12:55:07 PM	24	1278.50	CEUX
GENMAB A/S	04-Apr-2025	12:55:21 PM	28	1277.50	XCSE
GENMAB A/S	04-Apr-2025	12:55:21 PM	24	1277.50	CEUX
GENMAB A/S	04-Apr-2025	12:55:21 PM	13	1278.00	AQEU
GENMAB A/S	04-Apr-2025	12:55:21 PM	15	1278.00	AQEU
GENMAB A/S	04-Apr-2025	12:55:31 PM	23	1276.50	CEUX
GENMAB A/S	04-Apr-2025	12:55:38 PM	25	1277.50	CEUX
GENMAB A/S	04-Apr-2025	12:56:55 PM	34	1279.00	AQEU
GENMAB A/S	04-Apr-2025	12:57:15 PM	32	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:57:15 PM	30	1279.00	XCSE
GENMAB A/S	04-Apr-2025	12:57:46 PM	38	1278.00	XCSE
GENMAB A/S	04-Apr-2025	12:57:46 PM	23	1278.00	CEUX
GENMAB A/S	04-Apr-2025	12:58:33 PM	7	1278.00	XCSE
GENMAB A/S	04-Apr-2025	12:58:43 PM	45	1278.00	XCSE
GENMAB A/S	04-Apr-2025	12:58:43 PM	23	1278.00	CEUX
GENMAB A/S	04-Apr-2025	13:00:28 PM	16	1279.50	XCSE
GENMAB A/S	04-Apr-2025	13:00:28 PM	25	1279.50	XCSE
GENMAB A/S	04-Apr-2025	13:00:37 PM	16	1279.50	XCSE
GENMAB A/S	04-Apr-2025	13:01:08 PM	24	1279.00	CEUX
GENMAB A/S	04-Apr-2025	13:01:09 PM	30	1279.00	TQEX
GENMAB A/S	04-Apr-2025	13:01:14 PM	49	1278.50	XCSE
GENMAB A/S	04-Apr-2025	13:01:15 PM	21	1278.00	CEUX
GENMAB A/S	04-Apr-2025	13:01:15 PM	4	1278.00	CEUX
GENMAB A/S	04-Apr-2025	13:01:42 PM	36	1277.00	XCSE
GENMAB A/S	04-Apr-2025	13:01:42 PM	23	1277.00	CEUX
GENMAB A/S	04-Apr-2025	13:01:45 PM	40	1276.00	XCSE
GENMAB A/S	04-Apr-2025	13:04:05 PM	8	1277.50	XCSE
GENMAB A/S	04-Apr-2025	13:04:05 PM	45	1277.50	XCSE
GENMAB A/S	04-Apr-2025	13:04:05 PM	26	1277.50	CEUX
GENMAB A/S	04-Apr-2025	13:04:05 PM	23	1277.50	AQEU
GENMAB A/S	04-Apr-2025	13:04:54 PM	5	1277.00	XCSE

83

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	13:06:05 PM	21	1278.00	XCSE
GENMAB A/S	04-Apr-2025	13:06:05 PM	31	1278.00	XCSE
GENMAB A/S	04-Apr-2025	13:06:06 PM	26	1277.50	CEUX
GENMAB A/S	04-Apr-2025	13:06:07 PM	45	1277.00	XCSE
GENMAB A/S	04-Apr-2025	13:06:07 PM	23	1277.00	TQEX
GENMAB A/S	04-Apr-2025	13:06:07 PM	23	1276.50	CEUX
GENMAB A/S	04-Apr-2025	13:06:19 PM	2	1276.00	XCSE
GENMAB A/S	04-Apr-2025	13:06:19 PM	16	1276.00	XCSE
GENMAB A/S	04-Apr-2025	13:06:19 PM	23	1276.00	XCSE
GENMAB A/S	04-Apr-2025	13:06:32 PM	23	1275.50	CEUX
GENMAB A/S	04-Apr-2025	13:06:40 PM	5	1274.50	XCSE
GENMAB A/S	04-Apr-2025	13:06:43 PM	3	1274.50	XCSE
GENMAB A/S	04-Apr-2025	13:06:43 PM	34	1274.50	XCSE
GENMAB A/S	04-Apr-2025	13:08:40 PM	25	1274.50	CEUX
GENMAB A/S	04-Apr-2025	13:08:41 PM	34	1274.00	XCSE
GENMAB A/S	04-Apr-2025	13:08:41 PM	8	1274.00	XCSE
GENMAB A/S	04-Apr-2025	13:08:41 PM	7	1273.50	CEUX
GENMAB A/S	04-Apr-2025	13:08:49 PM	25	1273.00	XCSE
GENMAB A/S	04-Apr-2025	13:09:06 PM	30	1272.00	XCSE
GENMAB A/S	04-Apr-2025	13:09:37 PM	12	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:09:45 PM	9	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:09:56 PM	5	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:09:57 PM	5	1270.50	CEUX
GENMAB A/S	04-Apr-2025	13:09:57 PM	25	1270.50	CEUX
GENMAB A/S	04-Apr-2025	13:10:40 PM	9	1270.50	TQEX
GENMAB A/S	04-Apr-2025	13:10:40 PM	14	1270.50	TQEX
GENMAB A/S	04-Apr-2025	13:12:08 PM	30	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:13:03 PM	1	1270.50	CEUX
GENMAB A/S	04-Apr-2025	13:13:03 PM	1	1270.50	CEUX
GENMAB A/S	04-Apr-2025	13:14:05 PM	43	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:14:25 PM	21	1270.50	CEUX
GENMAB A/S	04-Apr-2025	13:14:53 PM	5	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:15:14 PM	58	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:15:14 PM	23	1270.00	XCSE
GENMAB A/S	04-Apr-2025	13:15:14 PM	1	1270.00	XCSE
GENMAB A/S	04-Apr-2025	13:15:14 PM	20	1271.00	CEUX
GENMAB A/S	04-Apr-2025	13:15:14 PM	19	1271.00	CEUX
GENMAB A/S	04-Apr-2025	13:15:14 PM	31	1269.50	CEUX
GENMAB A/S	04-Apr-2025	13:15:14 PM	23	1269.00	AQEU
GENMAB A/S	04-Apr-2025	13:15:59 PM	11	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:16:11 PM	32	1271.50	CEUX
GENMAB A/S	04-Apr-2025	13:16:47 PM	3	1272.00	XCSE
GENMAB A/S	04-Apr-2025	13:16:47 PM	44	1272.00	XCSE
GENMAB A/S	04-Apr-2025	13:17:10 PM	7	1271.50	TQEX
GENMAB A/S	04-Apr-2025	13:17:10 PM	18	1271.50	TQEX

84

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	13:19:06 PM	29	1271.00	XCSE
GENMAB A/S	04-Apr-2025	13:19:14 PM	29	1270.50	CEUX
GENMAB A/S	04-Apr-2025	13:20:30 PM	28	1270.00	XCSE
GENMAB A/S	04-Apr-2025	13:20:38 PM	24	1269.50	CEUX
GENMAB A/S	04-Apr-2025	13:20:41 PM	18	1269.00	XCSE
GENMAB A/S	04-Apr-2025	13:21:03 PM	8	1269.00	XCSE
GENMAB A/S	04-Apr-2025	13:21:03 PM	15	1269.00	AQEU
GENMAB A/S	04-Apr-2025	13:21:03 PM	11	1269.00	AQEU
GENMAB A/S	04-Apr-2025	13:21:40 PM	24	1268.00	CEUX
GENMAB A/S	04-Apr-2025	13:21:44 PM	63	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:21:46 PM	24	1267.00	CEUX
GENMAB A/S	04-Apr-2025	13:21:51 PM	21	1266.50	AQEU
GENMAB A/S	04-Apr-2025	13:22:03 PM	2	1266.50	AQEU
GENMAB A/S	04-Apr-2025	13:22:46 PM	67	1269.50	XCSE
GENMAB A/S	04-Apr-2025	13:22:46 PM	26	1269.00	TQEX
GENMAB A/S	04-Apr-2025	13:23:37 PM	1	1270.00	XCSE
GENMAB A/S	04-Apr-2025	13:23:37 PM	15	1270.00	XCSE
GENMAB A/S	04-Apr-2025	13:23:37 PM	31	1270.00	XCSE
GENMAB A/S	04-Apr-2025	13:23:46 PM	23	1269.50	CEUX
GENMAB A/S	04-Apr-2025	13:24:29 PM	2	1269.50	XCSE
GENMAB A/S	04-Apr-2025	13:24:29 PM	3	1269.50	XCSE
GENMAB A/S	04-Apr-2025	13:24:29 PM	19	1269.50	XCSE
GENMAB A/S	04-Apr-2025	13:24:35 PM	55	1268.50	XCSE
GENMAB A/S	04-Apr-2025	13:24:35 PM	28	1268.50	CEUX
GENMAB A/S	04-Apr-2025	13:24:58 PM	25	1268.00	CEUX
GENMAB A/S	04-Apr-2025	13:25:08 PM	2	1267.00	XCSE
GENMAB A/S	04-Apr-2025	13:25:08 PM	48	1267.00	XCSE
GENMAB A/S	04-Apr-2025	13:26:31 PM	23	1266.00	CEUX
GENMAB A/S	04-Apr-2025	13:27:50 PM	23	1266.00	CEUX
GENMAB A/S	04-Apr-2025	13:28:15 PM	24	1266.00	CEUX
GENMAB A/S	04-Apr-2025	13:28:25 PM	26	1265.50	XCSE
GENMAB A/S	04-Apr-2025	13:28:30 PM	20	1264.50	TQEX
GENMAB A/S	04-Apr-2025	13:28:45 PM	29	1264.50	XCSE
GENMAB A/S	04-Apr-2025	13:30:13 PM	24	1263.00	XCSE
GENMAB A/S	04-Apr-2025	13:30:13 PM	26	1263.00	CEUX
GENMAB A/S	04-Apr-2025	13:30:48 PM	11	1261.50	XCSE
GENMAB A/S	04-Apr-2025	13:30:48 PM	27	1261.50	AQEU
GENMAB A/S	04-Apr-2025	13:31:15 PM	74	1262.50	XCSE
GENMAB A/S	04-Apr-2025	13:32:01 PM	30	1261.50	XCSE
GENMAB A/S	04-Apr-2025	13:32:01 PM	1	1261.50	XCSE
GENMAB A/S	04-Apr-2025	13:32:54 PM	29	1261.50	CEUX
GENMAB A/S	04-Apr-2025	13:33:12 PM	9	1261.50	XCSE
GENMAB A/S	04-Apr-2025	13:34:20 PM	7	1263.00	TQEX
GENMAB A/S	04-Apr-2025	13:36:10 PM	87	1266.50	XCSE
GENMAB A/S	04-Apr-2025	13:36:10 PM	36	1266.50	CEUX

85

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	13:37:28 PM	85	1267.00	XCSE
GENMAB A/S	04-Apr-2025	13:37:29 PM	24	1266.50	CEUX
GENMAB A/S	04-Apr-2025	13:38:19 PM	33	1267.50	CEUX
GENMAB A/S	04-Apr-2025	13:39:06 PM	46	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:39:28 PM	9	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:40:02 PM	13	1268.50	XCSE
GENMAB A/S	04-Apr-2025	13:40:02 PM	68	1268.50	XCSE
GENMAB A/S	04-Apr-2025	13:41:09 PM	3	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:41:09 PM	25	1268.00	TQEX
GENMAB A/S	04-Apr-2025	13:41:09 PM	38	1268.00	CEUX
GENMAB A/S	04-Apr-2025	13:42:42 PM	22	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:42:42 PM	27	1266.50	XCSE
GENMAB A/S	04-Apr-2025	13:42:42 PM	36	1267.50	CEUX
GENMAB A/S	04-Apr-2025	13:42:42 PM	23	1266.50	CEUX
GENMAB A/S	04-Apr-2025	13:42:42 PM	24	1267.00	AQEU
GENMAB A/S	04-Apr-2025	13:43:10 PM	28	1266.50	CEUX
GENMAB A/S	04-Apr-2025	13:44:00 PM	21	1265.00	XCSE
GENMAB A/S	04-Apr-2025	13:44:00 PM	8	1265.00	CEUX
GENMAB A/S	04-Apr-2025	13:44:00 PM	25	1265.00	CEUX
GENMAB A/S	04-Apr-2025	13:44:32 PM	36	1265.00	XCSE
GENMAB A/S	04-Apr-2025	13:44:32 PM	3	1265.00	CEUX
GENMAB A/S	04-Apr-2025	13:44:33 PM	30	1264.00	CEUX
GENMAB A/S	04-Apr-2025	13:45:11 PM	5	1264.00	TQEX
GENMAB A/S	04-Apr-2025	13:45:11 PM	1	1264.00	TQEX
GENMAB A/S	04-Apr-2025	13:46:18 PM	13	1265.00	XCSE
GENMAB A/S	04-Apr-2025	13:46:25 PM	41	1265.00	XCSE
GENMAB A/S	04-Apr-2025	13:46:25 PM	32	1265.00	XCSE
GENMAB A/S	04-Apr-2025	13:46:58 PM	28	1264.00	TQEX
GENMAB A/S	04-Apr-2025	13:46:58 PM	3	1264.00	CEUX
GENMAB A/S	04-Apr-2025	13:47:11 PM	7	1263.50	XCSE
GENMAB A/S	04-Apr-2025	13:49:48 PM	23	1265.00	TQEX
GENMAB A/S	04-Apr-2025	13:50:09 PM	84	1264.50	XCSE
GENMAB A/S	04-Apr-2025	13:50:09 PM	18	1263.50	XCSE
GENMAB A/S	04-Apr-2025	13:50:09 PM	59	1263.50	XCSE
GENMAB A/S	04-Apr-2025	13:50:09 PM	29	1263.50	CEUX
GENMAB A/S	04-Apr-2025	13:52:56 PM	30	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:52:56 PM	38	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:52:56 PM	33	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:53:06 PM	78	1266.50	CEUX
GENMAB A/S	04-Apr-2025	13:54:03 PM	83	1266.00	XCSE
GENMAB A/S	04-Apr-2025	13:54:03 PM	23	1266.00	TQEX
GENMAB A/S	04-Apr-2025	13:54:03 PM	52	1265.50	CEUX
GENMAB A/S	04-Apr-2025	13:54:33 PM	86	1266.00	XCSE
GENMAB A/S	04-Apr-2025	13:54:33 PM	36	1266.00	CEUX
GENMAB A/S	04-Apr-2025	13:54:33 PM	25	1266.00	AQEU

86

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	13:55:07 PM	43	1266.50	XCSE
GENMAB A/S	04-Apr-2025	13:56:25 PM	87	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:56:25 PM	23	1268.00	TQEX
GENMAB A/S	04-Apr-2025	13:56:25 PM	57	1267.00	CEUX
GENMAB A/S	04-Apr-2025	13:56:43 PM	42	1266.50	XCSE
GENMAB A/S	04-Apr-2025	13:58:06 PM	4	1268.50	XCSE
GENMAB A/S	04-Apr-2025	13:58:54 PM	69	1269.00	CEUX
GENMAB A/S	04-Apr-2025	13:58:57 PM	79	1268.50	XCSE
GENMAB A/S	04-Apr-2025	13:59:18 PM	88	1268.50	XCSE
GENMAB A/S	04-Apr-2025	13:59:20 PM	84	1267.50	XCSE
GENMAB A/S	04-Apr-2025	13:59:20 PM	57	1268.00	CEUX
GENMAB A/S	04-Apr-2025	13:59:25 PM	58	1267.00	CEUX
GENMAB A/S	04-Apr-2025	14:00:20 PM	89	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:01:34 PM	85	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:01:41 PM	27	1269.00	TQEX
GENMAB A/S	04-Apr-2025	14:01:43 PM	85	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:01:43 PM	32	1268.50	CEUX
GENMAB A/S	04-Apr-2025	14:01:49 PM	55	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:01:51 PM	29	1267.00	CEUX
GENMAB A/S	04-Apr-2025	14:01:55 PM	47	1266.50	XCSE
GENMAB A/S	04-Apr-2025	14:02:44 PM	35	1265.50	XCSE
GENMAB A/S	04-Apr-2025	14:02:44 PM	23	1265.50	CEUX
GENMAB A/S	04-Apr-2025	14:07:33 PM	27	1268.00	TQEX
GENMAB A/S	04-Apr-2025	14:07:40 PM	20	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:07:45 PM	61	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:07:55 PM	2	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:07:55 PM	61	1267.50	CEUX
GENMAB A/S	04-Apr-2025	14:08:15 PM	25	1267.00	TQEX
GENMAB A/S	04-Apr-2025	14:08:41 PM	3	1267.00	CEUX
GENMAB A/S	04-Apr-2025	14:08:41 PM	62	1267.00	CEUX
GENMAB A/S	04-Apr-2025	14:09:19 PM	84	1266.50	XCSE
GENMAB A/S	04-Apr-2025	14:09:19 PM	23	1267.00	XCSE
GENMAB A/S	04-Apr-2025	14:10:29 PM	84	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:11:16 PM	90	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:11:36 PM	85	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:13:05 PM	23	1267.00	CEUX
GENMAB A/S	04-Apr-2025	14:13:05 PM	35	1267.00	CEUX
GENMAB A/S	04-Apr-2025	14:14:39 PM	86	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:14:39 PM	44	1266.00	CEUX
GENMAB A/S	04-Apr-2025	14:14:40 PM	30	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:15:10 PM	16	1266.50	XCSE
GENMAB A/S	04-Apr-2025	14:15:10 PM	16	1266.50	XCSE
GENMAB A/S	04-Apr-2025	14:15:38 PM	87	1267.50	CEUX
GENMAB A/S	04-Apr-2025	14:15:54 PM	89	1267.00	XCSE
GENMAB A/S	04-Apr-2025	14:15:54 PM	23	1267.00	TQEX

87

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	14:15:54 PM	29	1267.00	AQEU
GENMAB A/S	04-Apr-2025	14:16:00 PM	8	1267.00	XCSE
GENMAB A/S	04-Apr-2025	14:16:47 PM	24	1268.00	TQEX
GENMAB A/S	04-Apr-2025	14:16:47 PM	88	1268.00	CEUX
GENMAB A/S	04-Apr-2025	14:18:22 PM	41	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:18:22 PM	14	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:18:59 PM	46	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:18:59 PM	38	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:18:59 PM	14	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:18:59 PM	15	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:04 PM	13	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:04 PM	12	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:09 PM	9	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:22 PM	23	1269.00	TQEX
GENMAB A/S	04-Apr-2025	14:19:52 PM	35	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	12	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	13	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	15	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	30	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	8	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	14	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	38	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:19:52 PM	15	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:20:10 PM	13	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:20:10 PM	38	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:20:10 PM	16	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:20:10 PM	16	1269.50	XCSE
GENMAB A/S	04-Apr-2025	14:20:28 PM	87	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:20:28 PM	74	1268.50	CEUX
GENMAB A/S	04-Apr-2025	14:21:42 PM	23	1268.00	TQEX
GENMAB A/S	04-Apr-2025	14:21:42 PM	90	1268.00	CEUX
GENMAB A/S	04-Apr-2025	14:21:43 PM	9	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:21:58 PM	88	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:22:00 PM	86	1267.00	CEUX
GENMAB A/S	04-Apr-2025	14:23:00 PM	63	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:23:49 PM	23	1266.50	TQEX
GENMAB A/S	04-Apr-2025	14:24:10 PM	10	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:24:10 PM	11	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:24:10 PM	46	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:24:10 PM	88	1266.00	CEUX
GENMAB A/S	04-Apr-2025	14:24:11 PM	15	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:24:11 PM	8	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:24:11 PM	15	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:24:14 PM	23	1265.50	TQEX
GENMAB A/S	04-Apr-2025	14:24:40 PM	45	1265.50	XCSE

88

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	14:24:40 PM	30	1265.50	XCSE
GENMAB A/S	04-Apr-2025	14:24:40 PM	38	1265.50	XCSE
GENMAB A/S	04-Apr-2025	14:25:48 PM	16	1265.50	XCSE
GENMAB A/S	04-Apr-2025	14:25:48 PM	13	1265.50	XCSE
GENMAB A/S	04-Apr-2025	14:26:15 PM	23	1266.50	TQEX
GENMAB A/S	04-Apr-2025	14:27:00 PM	89	1265.50	XCSE
GENMAB A/S	04-Apr-2025	14:28:50 PM	58	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:29:29 PM	8	1266.50	CEUX
GENMAB A/S	04-Apr-2025	14:29:35 PM	24	1266.50	TQEX
GENMAB A/S	04-Apr-2025	14:29:35 PM	82	1266.50	CEUX
GENMAB A/S	04-Apr-2025	14:30:02 PM	8	1267.00	XCSE
GENMAB A/S	04-Apr-2025	14:30:02 PM	8	1267.00	XCSE
GENMAB A/S	04-Apr-2025	14:31:06 PM	84	1268.00	XCSE
GENMAB A/S	04-Apr-2025	14:31:06 PM	85	1268.00	CEUX
GENMAB A/S	04-Apr-2025	14:31:10 PM	14	1268.00	XCSE
GENMAB A/S	04-Apr-2025	14:31:16 PM	89	1267.00	XCSE
GENMAB A/S	04-Apr-2025	14:32:29 PM	38	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:32:29 PM	16	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:32:29 PM	14	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:32:29 PM	53	1268.00	CEUX
GENMAB A/S	04-Apr-2025	14:32:29 PM	37	1268.00	CEUX
GENMAB A/S	04-Apr-2025	14:32:39 PM	1	1268.00	XCSE
GENMAB A/S	04-Apr-2025	14:32:39 PM	89	1268.00	XCSE
GENMAB A/S	04-Apr-2025	14:32:39 PM	88	1268.00	CEUX
GENMAB A/S	04-Apr-2025	14:32:43 PM	23	1267.50	TQEX
GENMAB A/S	04-Apr-2025	14:32:44 PM	27	1267.50	AQEU
GENMAB A/S	04-Apr-2025	14:33:01 PM	86	1267.00	XCSE
GENMAB A/S	04-Apr-2025	14:34:01 PM	5	1266.50	CEUX
GENMAB A/S	04-Apr-2025	14:34:01 PM	38	1266.50	CEUX
GENMAB A/S	04-Apr-2025	14:35:36 PM	85	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:35:36 PM	46	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:35:36 PM	76	1268.50	CEUX
GENMAB A/S	04-Apr-2025	14:36:06 PM	85	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:36:06 PM	84	1267.50	CEUX
GENMAB A/S	04-Apr-2025	14:36:07 PM	25	1267.00	TQEX
GENMAB A/S	04-Apr-2025	14:36:40 PM	43	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:36:40 PM	34	1267.50	XCSE
GENMAB A/S	04-Apr-2025	14:36:42 PM	41	1266.50	CEUX
GENMAB A/S	04-Apr-2025	14:37:04 PM	31	1266.00	XCSE
GENMAB A/S	04-Apr-2025	14:37:04 PM	53	1265.50	CEUX
GENMAB A/S	04-Apr-2025	14:37:06 PM	86	1265.00	XCSE
GENMAB A/S	04-Apr-2025	14:37:33 PM	28	1264.50	XCSE
GENMAB A/S	04-Apr-2025	14:37:33 PM	55	1264.50	XCSE
GENMAB A/S	04-Apr-2025	14:37:58 PM	48	1264.00	CEUX
GENMAB A/S	04-Apr-2025	14:38:30 PM	83	1263.50	XCSE

89

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	14:38:45 PM	28	1263.00	CEUX
GENMAB A/S	04-Apr-2025	14:39:05 PM	30	1262.00	XCSE
GENMAB A/S	04-Apr-2025	14:39:05 PM	58	1262.00	XCSE
GENMAB A/S	04-Apr-2025	14:39:05 PM	25	1262.00	CEUX
GENMAB A/S	04-Apr-2025	14:40:04 PM	23	1264.50	CEUX
GENMAB A/S	04-Apr-2025	14:41:11 PM	83	1265.00	XCSE
GENMAB A/S	04-Apr-2025	14:42:18 PM	16	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:42:18 PM	69	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:42:40 PM	80	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:42:40 PM	23	1271.50	TQEX
GENMAB A/S	04-Apr-2025	14:42:40 PM	39	1272.00	CEUX
GENMAB A/S	04-Apr-2025	14:42:40 PM	23	1272.50	AQEU
GENMAB A/S	04-Apr-2025	14:43:10 PM	90	1271.00	XCSE
GENMAB A/S	04-Apr-2025	14:43:10 PM	42	1271.00	CEUX
GENMAB A/S	04-Apr-2025	14:44:50 PM	18	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:45:02 PM	72	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:45:02 PM	39	1270.00	CEUX
GENMAB A/S	04-Apr-2025	14:45:03 PM	31	1268.50	XCSE
GENMAB A/S	04-Apr-2025	14:45:03 PM	28	1269.00	CEUX
GENMAB A/S	04-Apr-2025	14:48:26 PM	86	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:48:26 PM	23	1272.50	TQEX
GENMAB A/S	04-Apr-2025	14:48:26 PM	45	1272.00	CEUX
GENMAB A/S	04-Apr-2025	14:48:26 PM	24	1271.50	AQEU
GENMAB A/S	04-Apr-2025	14:48:44 PM	80	1270.50	XCSE
GENMAB A/S	04-Apr-2025	14:48:44 PM	10	1270.50	XCSE
GENMAB A/S	04-Apr-2025	14:48:44 PM	3	1270.50	CEUX
GENMAB A/S	04-Apr-2025	14:48:44 PM	40	1270.50	CEUX
GENMAB A/S	04-Apr-2025	14:49:39 PM	9	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:49:54 PM	9	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:50:03 PM	18	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:50:18 PM	51	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:50:18 PM	24	1270.00	AQEU
GENMAB A/S	04-Apr-2025	14:52:30 PM	23	1270.00	TQEX
GENMAB A/S	04-Apr-2025	14:54:12 PM	3	1270.50	XCSE
GENMAB A/S	04-Apr-2025	14:54:12 PM	5	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:54:18 PM	1	1271.00	XCSE
GENMAB A/S	04-Apr-2025	14:54:18 PM	43	1271.00	XCSE
GENMAB A/S	04-Apr-2025	14:54:18 PM	38	1271.00	XCSE
GENMAB A/S	04-Apr-2025	14:55:12 PM	10	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:55:58 PM	69	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:55:58 PM	23	1270.00	TQEX
GENMAB A/S	04-Apr-2025	14:55:58 PM	3	1270.00	CEUX
GENMAB A/S	04-Apr-2025	14:55:58 PM	67	1270.00	CEUX
GENMAB A/S	04-Apr-2025	14:57:35 PM	75	1269.00	XCSE
GENMAB A/S	04-Apr-2025	14:57:35 PM	7	1269.00	CEUX

90

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	14:57:35 PM	18	1269.00	CEUX
GENMAB A/S	04-Apr-2025	14:58:24 PM	34	1272.00	AQEU
GENMAB A/S	04-Apr-2025	14:58:43 PM	38	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:43 PM	30	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:43 PM	15	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:43 PM	23	1271.50	TQEX
GENMAB A/S	04-Apr-2025	14:58:46 PM	43	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:46 PM	38	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:46 PM	15	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:46 PM	13	1272.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:56 PM	84	1271.00	XCSE
GENMAB A/S	04-Apr-2025	14:58:56 PM	22	1271.00	CEUX
GENMAB A/S	04-Apr-2025	14:58:56 PM	62	1271.00	CEUX
GENMAB A/S	04-Apr-2025	14:59:16 PM	83	1270.00	XCSE
GENMAB A/S	04-Apr-2025	14:59:16 PM	87	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:00:23 PM	13	1271.00	CEUX
GENMAB A/S	04-Apr-2025	15:00:23 PM	58	1271.00	CEUX
GENMAB A/S	04-Apr-2025	15:00:47 PM	8	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:01:18 PM	5	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:01:40 PM	44	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:01:40 PM	1	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:01:40 PM	90	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:01:40 PM	9	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:01:51 PM	27	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:01:51 PM	5	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:01:51 PM	1	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:02:12 PM	5	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:02:12 PM	23	1271.50	TQEX
GENMAB A/S	04-Apr-2025	15:02:47 PM	9	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:02:52 PM	26	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:02:59 PM	12	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:03:10 PM	9	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:03:20 PM	9	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:03:27 PM	23	1271.00	TQEX
GENMAB A/S	04-Apr-2025	15:04:01 PM	18	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:04:24 PM	3	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:04:50 PM	37	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:04:50 PM	18	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:04:50 PM	16	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:05:17 PM	87	1272.00	XCSE
GENMAB A/S	04-Apr-2025	15:05:43 PM	87	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:05:43 PM	83	1271.50	CEUX
GENMAB A/S	04-Apr-2025	15:06:32 PM	2	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:06:46 PM	9	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:06:46 PM	76	1271.50	XCSE

91

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:06:46 PM	23	1271.50	TQEX
GENMAB A/S	04-Apr-2025	15:06:58 PM	18	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:07:05 PM	9	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:07:18 PM	9	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:07:28 PM	18	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:07:47 PM	18	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:07:58 PM	9	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:08:06 PM	18	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:08:06 PM	7	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:08:30 PM	45	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:08:30 PM	12	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:09:44 PM	15	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:09:49 PM	72	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:10:00 PM	44	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:11:40 PM	23	1270.50	TQEX
GENMAB A/S	04-Apr-2025	15:11:40 PM	88	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:11:40 PM	36	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:11:40 PM	36	1271.00	CEUX
GENMAB A/S	04-Apr-2025	15:11:40 PM	20	1271.00	CEUX
GENMAB A/S	04-Apr-2025	15:11:40 PM	23	1270.50	AQEU
GENMAB A/S	04-Apr-2025	15:11:59 PM	10	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:11:59 PM	74	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:11:59 PM	23	1269.50	TQEX
GENMAB A/S	04-Apr-2025	15:12:29 PM	89	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:12:55 PM	50	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:13:26 PM	64	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:13:26 PM	20	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:14:50 PM	87	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:15:15 PM	36	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:15:15 PM	15	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:15:15 PM	23	1268.50	TQEX
GENMAB A/S	04-Apr-2025	15:15:15 PM	37	1268.50	AQEU
GENMAB A/S	04-Apr-2025	15:15:21 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:21 PM	26	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:21 PM	24	1268.50	TQEX
GENMAB A/S	04-Apr-2025	15:15:21 PM	17	1268.50	AQEU
GENMAB A/S	04-Apr-2025	15:15:35 PM	43	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:35 PM	4	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:35 PM	30	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:35 PM	36	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:39 PM	14	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:39 PM	25	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:39 PM	15	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:39 PM	38	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:15:42 PM	87	1270.00	XCSE

92

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:15:44 PM	85	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:15:49 PM	16	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:15:49 PM	7	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:17:14 PM	11	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:17:14 PM	73	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:18:13 PM	1	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:18:17 PM	38	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:18:17 PM	30	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:18:17 PM	23	1270.00	TQEX
GENMAB A/S	04-Apr-2025	15:18:17 PM	5	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:18:17 PM	83	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:18:19 PM	85	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:18:19 PM	87	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:18:36 PM	2	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:19:11 PM	90	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:19:11 PM	23	1271.00	TQEX
GENMAB A/S	04-Apr-2025	15:19:11 PM	82	1271.00	CEUX
GENMAB A/S	04-Apr-2025	15:19:19 PM	38	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:19:19 PM	13	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:19:20 PM	11	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:19:45 PM	9	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:19:50 PM	73	1271.50	CEUX
GENMAB A/S	04-Apr-2025	15:20:03 PM	10	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:03 PM	4	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:04 PM	32	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:04 PM	10	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:05 PM	16	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	67	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	30	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	14	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	13	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	38	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	18	1271.50	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	31	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	53	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:20:10 PM	23	1271.00	TQEX
GENMAB A/S	04-Apr-2025	15:20:10 PM	24	1270.00	TQEX
GENMAB A/S	04-Apr-2025	15:20:10 PM	58	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:20:28 PM	24	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:21:06 PM	18	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:21:08 PM	72	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:21:08 PM	24	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:21:24 PM	85	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:21:24 PM	90	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:21:24 PM	15	1268.00	CEUX

93

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:21:24 PM	24	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:21:24 PM	25	1269.50	AQEU
GENMAB A/S	04-Apr-2025	15:21:24 PM	8	1268.50	AQEU
GENMAB A/S	04-Apr-2025	15:21:37 PM	28	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:21:37 PM	24	1268.00	AQEU
GENMAB A/S	04-Apr-2025	15:21:38 PM	89	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:22:29 PM	45	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:22:56 PM	23	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:24:05 PM	39	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:24:07 PM	5	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:24:07 PM	15	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:24:25 PM	43	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:24:25 PM	38	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:24:25 PM	21	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:24:25 PM	11	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:24:25 PM	72	1269.50	CEUX
GENMAB A/S	04-Apr-2025	15:24:25 PM	20	1269.50	AQEU
GENMAB A/S	04-Apr-2025	15:24:33 PM	12	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:24:53 PM	25	1270.50	TQEX
GENMAB A/S	04-Apr-2025	15:24:53 PM	54	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:25:05 PM	89	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:25:05 PM	21	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:05 PM	4	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:05 PM	38	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:05 PM	30	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:05 PM	42	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:25:18 PM	25	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:25:35 PM	10	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:45 PM	83	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:25:45 PM	38	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:45 PM	40	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:45 PM	20	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:45 PM	15	1270.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:45 PM	16	1270.00	TQEX
GENMAB A/S	04-Apr-2025	15:25:45 PM	7	1270.00	TQEX
GENMAB A/S	04-Apr-2025	15:25:59 PM	7	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:25:59 PM	43	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:25:59 PM	34	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:25:59 PM	24	1269.00	TQEX
GENMAB A/S	04-Apr-2025	15:25:59 PM	50	1269.50	CEUX
GENMAB A/S	04-Apr-2025	15:25:59 PM	5	1269.50	AQEU
GENMAB A/S	04-Apr-2025	15:26:00 PM	25	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:26:08 PM	84	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:26:30 PM	79	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:26:30 PM	8	1267.00	XCSE

94

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:26:30 PM	34	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:27:20 PM	57	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:27:20 PM	25	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:27:32 PM	28	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:27:32 PM	25	1265.50	TQEX
GENMAB A/S	04-Apr-2025	15:27:50 PM	56	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:27:50 PM	46	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:27:50 PM	1	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:27:50 PM	11	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:27:50 PM	24	1268.00	AQEU
GENMAB A/S	04-Apr-2025	15:28:49 PM	90	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:28:55 PM	83	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:00 PM	21	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:29:00 PM	26	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:29:09 PM	34	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:29:09 PM	14	1268.50	AQEU
GENMAB A/S	04-Apr-2025	15:29:09 PM	12	1268.50	AQEU
GENMAB A/S	04-Apr-2025	15:29:48 PM	6	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:29:54 PM	12	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	14	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	7	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	15	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	13	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	16	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	13	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	16	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:29:58 PM	35	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:30:07 PM	40	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:30:19 PM	86	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:30:19 PM	14	1270.00	CEUX
GENMAB A/S	04-Apr-2025	15:30:20 PM	60	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:30:20 PM	30	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:30:20 PM	23	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:30:20 PM	23	1269.50	TQEX
GENMAB A/S	04-Apr-2025	15:30:22 PM	23	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:30:22 PM	63	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:30:40 PM	89	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:30:40 PM	23	1268.50	TQEX
GENMAB A/S	04-Apr-2025	15:30:40 PM	43	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:30:40 PM	1	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:30:47 PM	26	1269.50	XCSE

95

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:30:47 PM	15	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:30:50 PM	2	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:30:50 PM	1	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:30:50 PM	42	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:31:03 PM	43	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:03 PM	40	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:12 PM	8	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:12 PM	43	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:17 PM	34	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:18 PM	76	1273.00	CEUX
GENMAB A/S	04-Apr-2025	15:31:24 PM	31	1272.50	XCSE
GENMAB A/S	04-Apr-2025	15:31:24 PM	52	1272.50	XCSE
GENMAB A/S	04-Apr-2025	15:31:24 PM	8	1273.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:24 PM	15	1273.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:24 PM	27	1272.00	TQEX
GENMAB A/S	04-Apr-2025	15:31:25 PM	2	1271.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:25 PM	3	1271.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:25 PM	1	1271.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:25 PM	43	1271.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:25 PM	12	1271.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:28 PM	1	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:28 PM	1	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:31 PM	2	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:31 PM	15	1271.00	TQEX
GENMAB A/S	04-Apr-2025	15:31:31 PM	9	1271.00	TQEX
GENMAB A/S	04-Apr-2025	15:31:35 PM	3	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:35 PM	68	1270.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:40 PM	16	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:40 PM	24	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:40 PM	10	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:40 PM	29	1271.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:48 PM	1	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:48 PM	88	1270.00	XCSE
GENMAB A/S	04-Apr-2025	15:31:49 PM	4	1269.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:49 PM	1	1269.50	CEUX
GENMAB A/S	04-Apr-2025	15:31:53 PM	10	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:00 PM	28	1269.50	TQEX
GENMAB A/S	04-Apr-2025	15:32:00 PM	20	1269.50	CEUX
GENMAB A/S	04-Apr-2025	15:32:00 PM	24	1269.50	AQEU
GENMAB A/S	04-Apr-2025	15:32:03 PM	1	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:03 PM	79	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:07 PM	10	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:32:07 PM	14	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:32:10 PM	89	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:32:13 PM	28	1268.00	CEUX

96

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:32:13 PM	14	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:32:13 PM	12	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:32:23 PM	5	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:23 PM	79	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:37 PM	23	1267.00	TQEX
GENMAB A/S	04-Apr-2025	15:32:37 PM	23	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:32:40 PM	25	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:32:40 PM	38	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:32:40 PM	44	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:40 PM	6	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:51 PM	23	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:32:54 PM	63	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:32:54 PM	1	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:32:54 PM	22	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:32:54 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:54 PM	30	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:32:54 PM	10	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:33:20 PM	88	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:33:29 PM	3	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:33:29 PM	19	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:33:29 PM	21	1268.00	TQEX
GENMAB A/S	04-Apr-2025	15:33:29 PM	3	1268.00	TQEX
GENMAB A/S	04-Apr-2025	15:33:29 PM	29	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:33:29 PM	42	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:33:50 PM	65	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:34:00 PM	4	1267.00	TQEX
GENMAB A/S	04-Apr-2025	15:34:00 PM	14	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:34:00 PM	5	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:34:04 PM	38	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:34:04 PM	22	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:34:04 PM	38	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:34:04 PM	83	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:34:04 PM	22	1267.00	TQEX
GENMAB A/S	04-Apr-2025	15:34:04 PM	32	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:34:04 PM	21	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:34:58 PM	38	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:34:58 PM	18	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:35:02 PM	26	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:02 PM	5	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:02 PM	6	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:02 PM	10	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:02 PM	6	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:35:06 PM	100	1269.50	XCSE
GENMAB A/S	04-Apr-2025	15:35:35 PM	40	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:39 PM	45	1269.00	XCSE

97

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:35:39 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:39 PM	15	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:39 PM	13	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:39 PM	64	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:35:39 PM	24	1268.50	TQEX
GENMAB A/S	04-Apr-2025	15:35:39 PM	89	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:35:46 PM	14	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:05 PM	87	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:05 PM	26	1269.00	TQEX
GENMAB A/S	04-Apr-2025	15:36:05 PM	36	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:08 PM	13	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:14 PM	11	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:21 PM	36	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:22 PM	3	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:22 PM	3	1269.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:24 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:24 PM	30	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:24 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:24 PM	30	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:24 PM	22	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:36:24 PM	43	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:36:24 PM	25	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:36:25 PM	13	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:25 PM	38	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:26 PM	30	1269.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:27 PM	22	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:27 PM	26	1268.00	TQEX
GENMAB A/S	04-Apr-2025	15:36:27 PM	26	1268.00	AQEU
GENMAB A/S	04-Apr-2025	15:36:44 PM	44	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:44 PM	15	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:44 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:50 PM	15	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:50 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:50 PM	12	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:55 PM	87	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:36:55 PM	90	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:36:55 PM	37	1267.00	AQEU
GENMAB A/S	04-Apr-2025	15:37:14 PM	86	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:37:14 PM	24	1267.50	TQEX
GENMAB A/S	04-Apr-2025	15:37:32 PM	20	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:37:32 PM	19	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:38:10 PM	74	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:10 PM	9	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:10 PM	19	1267.00	TQEX
GENMAB A/S	04-Apr-2025	15:38:10 PM	50	1267.00	CEUX

98

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:38:50 PM	38	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:50 PM	20	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	15	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	9	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	14	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	14	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	14	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	38	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	14	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	16	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:38:51 PM	16	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:00 PM	15	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:00 PM	15	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:00 PM	20	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:00 PM	2	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:00 PM	5	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:00 PM	2	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:00 PM	85	1266.00	XCSE
GENMAB A/S	04-Apr-2025	15:39:22 PM	23	1266.00	TQEX
GENMAB A/S	04-Apr-2025	15:39:22 PM	36	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:39:22 PM	37	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:39:28 PM	11	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:39:30 PM	36	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:39:47 PM	88	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:39:57 PM	54	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:40:00 PM	44	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:00 PM	11	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:00 PM	38	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:00 PM	11	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:00 PM	9	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:19 PM	87	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:19 PM	13	1266.00	TQEX
GENMAB A/S	04-Apr-2025	15:40:19 PM	84	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:40:40 PM	44	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:40 PM	6	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:40 PM	4	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:40 PM	28	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:40 PM	66	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:44 PM	17	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:40:45 PM	27	1265.00	TQEX
GENMAB A/S	04-Apr-2025	15:40:48 PM	90	1264.50	CEUX
GENMAB A/S	04-Apr-2025	15:41:15 PM	88	1264.00	XCSE
GENMAB A/S	04-Apr-2025	15:41:28 PM	2	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:41:34 PM	11	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:41:39 PM	32	1265.00	CEUX

99

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:41:39 PM	22	1264.50	AQEU
GENMAB A/S	04-Apr-2025	15:42:04 PM	43	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:42:35 PM	37	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:42:35 PM	47	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:42:40 PM	32	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:40 PM	1	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:40 PM	39	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:42 PM	3	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:45 PM	13	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:45 PM	27	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:47 PM	9	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:47 PM	9	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:47 PM	26	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:57 PM	12	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:42:57 PM	9	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:43:00 PM	36	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:43:00 PM	33	1265.00	TQEX
GENMAB A/S	04-Apr-2025	15:43:00 PM	43	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:43:00 PM	46	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:43:07 PM	83	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:43:07 PM	38	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:43:07 PM	5	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:43:07 PM	41	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:43:09 PM	1	1264.50	AQEU
GENMAB A/S	04-Apr-2025	15:43:10 PM	44	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:43:10 PM	30	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:43:10 PM	25	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:43:10 PM	14	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:43:31 PM	14	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:43:40 PM	100	1266.00	XCSE
GENMAB A/S	04-Apr-2025	15:44:20 PM	17	1266.50	TQEX
GENMAB A/S	04-Apr-2025	15:44:20 PM	10	1266.50	TQEX
GENMAB A/S	04-Apr-2025	15:44:27 PM	84	1266.00	XCSE
GENMAB A/S	04-Apr-2025	15:44:30 PM	60	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:44:30 PM	38	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:30 PM	9	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:30 PM	6	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:30 PM	23	1265.50	TQEX
GENMAB A/S	04-Apr-2025	15:44:30 PM	12	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:44:30 PM	72	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:44:47 PM	30	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:47 PM	14	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:47 PM	38	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:47 PM	15	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:47 PM	24	1265.00	AQEU

100

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:44:48 PM	16	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:48 PM	30	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:49 PM	13	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:44:49 PM	15	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:03 PM	39	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:03 PM	2	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:03 PM	38	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:03 PM	6	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:03 PM	88	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:14 PM	24	1264.50	TQEX
GENMAB A/S	04-Apr-2025	15:45:14 PM	10	1264.50	CEUX
GENMAB A/S	04-Apr-2025	15:45:14 PM	79	1264.50	CEUX
GENMAB A/S	04-Apr-2025	15:45:20 PM	38	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:20 PM	10	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:20 PM	30	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:20 PM	14	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:45:40 PM	23	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:45:50 PM	85	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:45:50 PM	27	1265.00	TQEX
GENMAB A/S	04-Apr-2025	15:46:00 PM	1	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:46:41 PM	48	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:46:43 PM	12	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:47:11 PM	43	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:11 PM	68	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:11 PM	2	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:12 PM	100	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:12 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:12 PM	100	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:12 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:13 PM	100	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:13 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:13 PM	20	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:13 PM	87	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:47:13 PM	34	1267.50	AQEU
GENMAB A/S	04-Apr-2025	15:47:28 PM	90	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:28 PM	83	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:35 PM	24	1267.50	TQEX
GENMAB A/S	04-Apr-2025	15:47:45 PM	61	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:45 PM	27	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:47:45 PM	11	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:46 PM	36	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:46 PM	23	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:48 PM	1	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:48 PM	26	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:49 PM	8	1267.00	CEUX

101

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:47:49 PM	9	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:49 PM	8	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:47:51 PM	25	1266.50	TQEX
GENMAB A/S	04-Apr-2025	15:47:51 PM	37	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:47:51 PM	53	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:48:00 PM	31	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:19 PM	24	1266.00	TQEX
GENMAB A/S	04-Apr-2025	15:48:27 PM	46	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:27 PM	43	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:48:27 PM	44	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:48:28 PM	88	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:48 PM	86	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:48 PM	27	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:49 PM	1	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:49 PM	16	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:49 PM	15	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:48:51 PM	89	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:04 PM	25	1265.00	TQEX
GENMAB A/S	04-Apr-2025	15:49:08 PM	10	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:49:08 PM	3	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:49:08 PM	12	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:49:10 PM	86	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:14 PM	88	1264.50	CEUX
GENMAB A/S	04-Apr-2025	15:49:30 PM	45	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:30 PM	11	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:30 PM	3	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:30 PM	38	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:50 PM	45	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:49:50 PM	25	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:49:50 PM	38	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:50 PM	5	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:49:59 PM	28	1264.00	TQEX
GENMAB A/S	04-Apr-2025	15:50:00 PM	6	1264.00	CEUX
GENMAB A/S	04-Apr-2025	15:50:32 PM	28	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:50:32 PM	15	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:50:32 PM	15	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:51:00 PM	26	1265.50	TQEX
GENMAB A/S	04-Apr-2025	15:51:00 PM	21	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:51:00 PM	36	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:51:00 PM	63	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:51:04 PM	30	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:51:10 PM	36	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:51:50 PM	27	1264.50	TQEX
GENMAB A/S	04-Apr-2025	15:51:53 PM	1	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:51:55 PM	18	1264.50	XCSE

102

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:51:55 PM	68	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:52:05 PM	46	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:52:05 PM	36	1264.50	CEUX
GENMAB A/S	04-Apr-2025	15:52:05 PM	20	1264.00	AQEU
GENMAB A/S	04-Apr-2025	15:52:25 PM	38	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:52:25 PM	21	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:52:25 PM	8	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:52:25 PM	11	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:52:25 PM	2	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:52:25 PM	23	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:52:50 PM	85	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:52:53 PM	5	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:52:58 PM	2	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	38	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	46	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	29	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	9	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	22	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	33	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	11	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	19	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	38	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	32	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:03 PM	36	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:53:04 PM	16	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:04 PM	15	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:04 PM	38	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:34 PM	40	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:53:49 PM	45	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:53:49 PM	68	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:53:49 PM	15	1268.50	TQEX
GENMAB A/S	04-Apr-2025	15:53:49 PM	20	1268.50	TQEX
GENMAB A/S	04-Apr-2025	15:53:49 PM	37	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:53:49 PM	36	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:53:49 PM	11	1268.50	CEUX
GENMAB A/S	04-Apr-2025	15:54:03 PM	11	1267.50	TQEX
GENMAB A/S	04-Apr-2025	15:54:03 PM	13	1267.50	TQEX
GENMAB A/S	04-Apr-2025	15:54:03 PM	84	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:54:03 PM	25	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:54:19 PM	31	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:19 PM	5	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:19 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:19 PM	13	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:19 PM	14	1268.00	XCSE

103

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:54:19 PM	40	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:19 PM	14	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:20 PM	85	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:54:45 PM	83	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:45 PM	45	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:45 PM	21	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:45 PM	40	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:54:45 PM	88	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:54:52 PM	24	1266.50	TQEX
GENMAB A/S	04-Apr-2025	15:54:52 PM	85	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:54:52 PM	30	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:55:01 PM	19	1266.00	XCSE
GENMAB A/S	04-Apr-2025	15:55:01 PM	68	1266.00	XCSE
GENMAB A/S	04-Apr-2025	15:55:02 PM	8	1266.50	CEUX
GENMAB A/S	04-Apr-2025	15:55:11 PM	15	1265.50	CEUX
GENMAB A/S	04-Apr-2025	15:55:17 PM	10	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:55:17 PM	7	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:55:17 PM	13	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:55:17 PM	14	1265.50	XCSE
GENMAB A/S	04-Apr-2025	15:55:17 PM	20	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:55:17 PM	3	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:55:17 PM	65	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:55:20 PM	46	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:55:20 PM	34	1265.00	TQEX
GENMAB A/S	04-Apr-2025	15:55:20 PM	88	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:55:27 PM	14	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:55:27 PM	27	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:55:50 PM	89	1265.00	CEUX
GENMAB A/S	04-Apr-2025	15:55:53 PM	12	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:55:53 PM	26	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:56:20 PM	39	1263.50	XCSE
GENMAB A/S	04-Apr-2025	15:56:20 PM	3	1264.00	AQEU
GENMAB A/S	04-Apr-2025	15:56:37 PM	84	1264.00	CEUX
GENMAB A/S	04-Apr-2025	15:56:44 PM	8	1264.00	TQEX
GENMAB A/S	04-Apr-2025	15:56:44 PM	17	1264.00	TQEX
GENMAB A/S	04-Apr-2025	15:56:53 PM	15	1264.00	XCSE
GENMAB A/S	04-Apr-2025	15:56:53 PM	25	1264.00	XCSE
GENMAB A/S	04-Apr-2025	15:56:53 PM	47	1263.50	XCSE
GENMAB A/S	04-Apr-2025	15:56:57 PM	15	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:56:57 PM	15	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:56:58 PM	15	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:56:58 PM	15	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:56:58 PM	13	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:56:59 PM	16	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:57:00 PM	30	1264.50	XCSE

104

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:57:00 PM	40	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:57:00 PM	14	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:57:00 PM	15	1264.50	XCSE
GENMAB A/S	04-Apr-2025	15:57:00 PM	83	1264.00	XCSE
GENMAB A/S	04-Apr-2025	15:57:00 PM	23	1264.00	TQEX
GENMAB A/S	04-Apr-2025	15:57:00 PM	16	1264.50	CEUX
GENMAB A/S	04-Apr-2025	15:57:00 PM	72	1264.50	CEUX
GENMAB A/S	04-Apr-2025	15:57:28 PM	84	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:57:29 PM	43	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:57:29 PM	40	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:57:29 PM	14	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:57:29 PM	14	1265.00	XCSE
GENMAB A/S	04-Apr-2025	15:57:29 PM	20	1264.50	AQEU
GENMAB A/S	04-Apr-2025	15:57:44 PM	3	1265.00	TQEX
GENMAB A/S	04-Apr-2025	15:57:44 PM	23	1265.00	TQEX
GENMAB A/S	04-Apr-2025	15:57:49 PM	28	1266.00	CEUX
GENMAB A/S	04-Apr-2025	15:58:12 PM	85	1267.50	XCSE
GENMAB A/S	04-Apr-2025	15:58:12 PM	27	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:58:12 PM	61	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:58:24 PM	88	1266.50	XCSE
GENMAB A/S	04-Apr-2025	15:58:24 PM	44	1267.00	XCSE
GENMAB A/S	04-Apr-2025	15:58:24 PM	14	1267.00	TQEX
GENMAB A/S	04-Apr-2025	15:58:24 PM	15	1267.00	TQEX
GENMAB A/S	04-Apr-2025	15:58:24 PM	25	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:58:24 PM	27	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:58:24 PM	3	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:58:24 PM	23	1267.00	CEUX
GENMAB A/S	04-Apr-2025	15:58:36 PM	84	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:58:36 PM	83	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:59:12 PM	27	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:12 PM	40	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	10	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	74	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	40	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	27	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	40	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	6	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	16	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	15	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	27	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	40	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	15	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:17 PM	12	1268.00	TQEX
GENMAB A/S	04-Apr-2025	15:59:17 PM	14	1268.00	TQEX
GENMAB A/S	04-Apr-2025	15:59:17 PM	62	1268.00	CEUX

105

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	15:59:17 PM	28	1268.00	CEUX
GENMAB A/S	04-Apr-2025	15:59:18 PM	27	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:18 PM	40	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:18 PM	16	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:18 PM	14	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:18 PM	75	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:59:18 PM	9	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	5	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	40	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	11	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	15	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	33	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	9	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	27	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	40	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	14	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	15	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:40 PM	17	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:41 PM	13	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:41 PM	40	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:41 PM	15	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:41 PM	9	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:44 PM	14	1268.50	XCSE
GENMAB A/S	04-Apr-2025	15:59:44 PM	86	1268.00	XCSE
GENMAB A/S	04-Apr-2025	15:59:52 PM	39	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:59:52 PM	45	1267.50	CEUX
GENMAB A/S	04-Apr-2025	15:59:59 PM	16	1268.00	XCSE
GENMAB A/S	04-Apr-2025	16:00:00 PM	29	1267.50	TQEX
GENMAB A/S	04-Apr-2025	16:00:01 PM	88	1267.00	XCSE
GENMAB A/S	04-Apr-2025	16:00:01 PM	66	1266.50	CEUX
GENMAB A/S	04-Apr-2025	16:00:01 PM	19	1266.50	CEUX
GENMAB A/S	04-Apr-2025	16:00:09 PM	89	1267.00	XCSE
GENMAB A/S	04-Apr-2025	16:00:09 PM	23	1267.00	AQEU
GENMAB A/S	04-Apr-2025	16:00:19 PM	85	1266.50	CEUX
GENMAB A/S	04-Apr-2025	16:00:29 PM	86	1266.00	XCSE
GENMAB A/S	04-Apr-2025	16:00:30 PM	51	1265.50	CEUX
GENMAB A/S	04-Apr-2025	16:00:30 PM	35	1265.50	CEUX
GENMAB A/S	04-Apr-2025	16:00:31 PM	83	1265.50	XCSE
GENMAB A/S	04-Apr-2025	16:01:04 PM	20	1267.00	AQEU
GENMAB A/S	04-Apr-2025	16:01:06 PM	86	1267.00	XCSE
GENMAB A/S	04-Apr-2025	16:01:06 PM	25	1267.00	TQEX
GENMAB A/S	04-Apr-2025	16:01:06 PM	84	1267.00	CEUX
GENMAB A/S	04-Apr-2025	16:01:06 PM	6	1267.00	AQEU
GENMAB A/S	04-Apr-2025	16:01:20 PM	12	1265.50	XCSE
GENMAB A/S	04-Apr-2025	16:01:20 PM	47	1266.00	CEUX

106

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	16:01:42 PM	85	1266.50	XCSE
GENMAB A/S	04-Apr-2025	16:01:42 PM	23	1266.50	TQEX
GENMAB A/S	04-Apr-2025	16:01:44 PM	44	1266.50	XCSE
GENMAB A/S	04-Apr-2025	16:01:44 PM	40	1266.50	XCSE
GENMAB A/S	04-Apr-2025	16:01:44 PM	29	1266.50	XCSE
GENMAB A/S	04-Apr-2025	16:01:44 PM	20	1266.00	CEUX
GENMAB A/S	04-Apr-2025	16:01:44 PM	20	1266.00	CEUX
GENMAB A/S	04-Apr-2025	16:02:20 PM	23	1266.00	TQEX
GENMAB A/S	04-Apr-2025	16:02:20 PM	84	1266.00	CEUX
GENMAB A/S	04-Apr-2025	16:02:20 PM	3	1266.00	CEUX
GENMAB A/S	04-Apr-2025	16:02:20 PM	23	1266.00	AQEU
GENMAB A/S	04-Apr-2025	16:02:50 PM	74	1265.50	XCSE
GENMAB A/S	04-Apr-2025	16:02:51 PM	41	1265.50	XCSE
GENMAB A/S	04-Apr-2025	16:02:51 PM	7	1265.50	XCSE
GENMAB A/S	04-Apr-2025	16:03:15 PM	44	1265.00	XCSE
GENMAB A/S	04-Apr-2025	16:03:15 PM	25	1265.00	XCSE
GENMAB A/S	04-Apr-2025	16:03:15 PM	53	1264.50	XCSE
GENMAB A/S	04-Apr-2025	16:04:00 PM	35	1264.50	XCSE
GENMAB A/S	04-Apr-2025	16:04:00 PM	25	1265.00	TQEX
GENMAB A/S	04-Apr-2025	16:04:10 PM	11	1265.00	XCSE
GENMAB A/S	04-Apr-2025	16:04:11 PM	13	1265.00	XCSE
GENMAB A/S	04-Apr-2025	16:04:30 PM	1	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:04:33 PM	43	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:04:33 PM	41	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:04:33 PM	36	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:04:33 PM	23	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:04:33 PM	25	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:00 PM	7	1264.50	XCSE
GENMAB A/S	04-Apr-2025	16:05:00 PM	40	1264.50	XCSE
GENMAB A/S	04-Apr-2025	16:05:00 PM	26	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:05:00 PM	36	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:01 PM	36	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:01 PM	1	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:01 PM	26	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:01 PM	3	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:01 PM	14	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:01 PM	6	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:01 PM	7	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:05:07 PM	61	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:05:07 PM	30	1264.00	TQEX
GENMAB A/S	04-Apr-2025	16:05:07 PM	21	1264.00	AQEU
GENMAB A/S	04-Apr-2025	16:05:07 PM	13	1264.00	AQEU
GENMAB A/S	04-Apr-2025	16:05:23 PM	12	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:05:27 PM	11	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:05:28 PM	12	1264.00	CEUX

107

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	16:05:28 PM	10	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:05:36 PM	19	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:05:40 PM	46	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:05:40 PM	25	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:05:46 PM	36	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:06:03 PM	40	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	33	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	14	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	15	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	11	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	35	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	40	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	32	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	6	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:03 PM	13	1263.50	CEUX
GENMAB A/S	04-Apr-2025	16:06:03 PM	21	1263.50	CEUX
GENMAB A/S	04-Apr-2025	16:06:03 PM	22	1263.50	CEUX
GENMAB A/S	04-Apr-2025	16:06:03 PM	33	1263.50	CEUX
GENMAB A/S	04-Apr-2025	16:06:04 PM	16	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:04 PM	14	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:04 PM	32	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:04 PM	40	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:04 PM	11	1264.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:06 PM	29	1264.00	TQEX
GENMAB A/S	04-Apr-2025	16:06:30 PM	14	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:06:48 PM	4	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:06:50 PM	36	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:06:52 PM	36	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:06:52 PM	8	1264.00	CEUX
GENMAB A/S	04-Apr-2025	16:06:53 PM	14	1263.50	CEUX
GENMAB A/S	04-Apr-2025	16:06:57 PM	40	1263.50	XCSE
GENMAB A/S	04-Apr-2025	16:06:57 PM	20	1263.50	XCSE
GENMAB A/S	04-Apr-2025	16:06:57 PM	32	1263.50	XCSE
GENMAB A/S	04-Apr-2025	16:06:57 PM	84	1263.00	XCSE
GENMAB A/S	04-Apr-2025	16:06:57 PM	74	1263.50	CEUX
GENMAB A/S	04-Apr-2025	16:06:57 PM	26	1263.50	AQEU
GENMAB A/S	04-Apr-2025	16:06:58 PM	23	1263.00	TQEX
GENMAB A/S	04-Apr-2025	16:07:03 PM	9	1263.00	XCSE
GENMAB A/S	04-Apr-2025	16:07:03 PM	22	1262.50	AQEU
GENMAB A/S	04-Apr-2025	16:07:19 PM	40	1263.00	XCSE
GENMAB A/S	04-Apr-2025	16:07:19 PM	49	1263.00	XCSE
GENMAB A/S	04-Apr-2025	16:07:19 PM	12	1262.50	CEUX
GENMAB A/S	04-Apr-2025	16:07:19 PM	1	1262.50	AQEU
GENMAB A/S	04-Apr-2025	16:07:20 PM	11	1263.00	CEUX
GENMAB A/S	04-Apr-2025	16:07:27 PM	44	1263.00	XCSE

108

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	16:07:27 PM	49	1263.00	XCSE
GENMAB A/S	04-Apr-2025	16:07:27 PM	11	1263.00	XCSE
GENMAB A/S	04-Apr-2025	16:07:27 PM	9	1263.00	XCSE
GENMAB A/S	04-Apr-2025	16:07:27 PM	23	1262.00	TQEX
GENMAB A/S	04-Apr-2025	16:07:27 PM	21	1263.00	CEUX
GENMAB A/S	04-Apr-2025	16:07:27 PM	74	1262.50	CEUX
GENMAB A/S	04-Apr-2025	16:07:28 PM	13	1262.50	XCSE
GENMAB A/S	04-Apr-2025	16:07:28 PM	27	1262.50	XCSE
GENMAB A/S	04-Apr-2025	16:07:28 PM	7	1262.50	XCSE
GENMAB A/S	04-Apr-2025	16:07:28 PM	9	1262.50	XCSE
GENMAB A/S	04-Apr-2025	16:07:35 PM	10	1262.50	XCSE
GENMAB A/S	04-Apr-2025	16:07:35 PM	49	1262.50	XCSE
GENMAB A/S	04-Apr-2025	16:07:35 PM	6	1262.50	XCSE
GENMAB A/S	04-Apr-2025	16:07:38 PM	20	1262.50	CEUX
GENMAB A/S	04-Apr-2025	16:07:38 PM	65	1262.50	CEUX
GENMAB A/S	04-Apr-2025	16:08:26 PM	19	1264.50	TQEX
GENMAB A/S	04-Apr-2025	16:08:26 PM	15	1264.50	TQEX
GENMAB A/S	04-Apr-2025	16:08:27 PM	40	1265.00	XCSE
GENMAB A/S	04-Apr-2025	16:08:27 PM	46	1265.00	XCSE
GENMAB A/S	04-Apr-2025	16:08:30 PM	27	1265.50	CEUX
GENMAB A/S	04-Apr-2025	16:09:08 PM	20	1265.00	CEUX
GENMAB A/S	04-Apr-2025	16:09:09 PM	36	1265.00	CEUX
GENMAB A/S	04-Apr-2025	16:09:10 PM	26	1265.00	CEUX
GENMAB A/S	04-Apr-2025	16:09:21 PM	1	1264.50	TQEX
GENMAB A/S	04-Apr-2025	16:09:21 PM	25	1264.50	TQEX
GENMAB A/S	04-Apr-2025	16:09:21 PM	3	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:09:21 PM	81	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:09:36 PM	12	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:09:36 PM	8	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:09:36 PM	3	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:10:03 PM	20	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:10:08 PM	32	1264.50	TQEX
GENMAB A/S	04-Apr-2025	16:10:08 PM	51	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:10:08 PM	15	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:10:09 PM	36	1264.50	CEUX
GENMAB A/S	04-Apr-2025	16:11:21 PM	31	1263.50	TQEX
GENMAB A/S	04-Apr-2025	16:12:24 PM	27	1262.00	TQEX
GENMAB A/S	04-Apr-2025	16:12:25 PM	25	1261.00	TQEX
GENMAB A/S	04-Apr-2025	16:13:24 PM	27	1261.00	TQEX
GENMAB A/S	04-Apr-2025	16:15:10 PM	33	1262.00	TQEX
GENMAB A/S	04-Apr-2025	16:15:20 PM	28	1261.00	TQEX
GENMAB A/S	04-Apr-2025	16:16:03 PM	19	1260.00	TQEX
GENMAB A/S	04-Apr-2025	16:16:16 PM	3	1260.00	TQEX
GENMAB A/S	04-Apr-2025	16:16:16 PM	5	1260.00	TQEX
GENMAB A/S	04-Apr-2025	16:17:34 PM	7	1261.00	TQEX

109

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	16:17:34 PM	20	1261.00	TQEX
GENMAB A/S	04-Apr-2025	16:18:18 PM	20	1261.00	TQEX
GENMAB A/S	04-Apr-2025	16:18:18 PM	7	1261.00	TQEX
GENMAB A/S	04-Apr-2025	16:18:18 PM	8	1261.00	TQEX
GENMAB A/S	04-Apr-2025	16:20:22 PM	36	1260.50	TQEX
GENMAB A/S	04-Apr-2025	16:21:02 PM	26	1259.50	TQEX
GENMAB A/S	04-Apr-2025	16:21:29 PM	34	1260.00	TQEX
GENMAB A/S	04-Apr-2025	16:21:56 PM	35	1258.50	TQEX
GENMAB A/S	04-Apr-2025	16:22:20 PM	24	1258.00	TQEX
GENMAB A/S	04-Apr-2025	16:23:31 PM	26	1258.00	TQEX
GENMAB A/S	04-Apr-2025	16:23:42 PM	28	1257.00	TQEX
GENMAB A/S	04-Apr-2025	16:25:24 PM	28	1256.00	TQEX
GENMAB A/S	04-Apr-2025	16:26:51 PM	29	1256.00	TQEX
GENMAB A/S	04-Apr-2025	16:27:22 PM	8	1255.00	TQEX
GENMAB A/S	04-Apr-2025	16:27:22 PM	18	1255.00	TQEX
GENMAB A/S	04-Apr-2025	16:28:15 PM	26	1255.00	TQEX
GENMAB A/S	04-Apr-2025	16:28:33 PM	25	1255.00	TQEX
GENMAB A/S	04-Apr-2025	16:29:44 PM	26	1254.00	TQEX
GENMAB A/S	04-Apr-2025	16:30:09 PM	26	1255.00	TQEX
GENMAB A/S	04-Apr-2025	16:30:09 PM	25	1255.00	TQEX
GENMAB A/S	04-Apr-2025	16:30:44 PM	27	1256.00	TQEX
GENMAB A/S	04-Apr-2025	16:31:55 PM	36	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:34:44 PM	28	1251.50	TQEX
GENMAB A/S	04-Apr-2025	16:36:03 PM	23	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:37:23 PM	6	1253.00	TQEX
GENMAB A/S	04-Apr-2025	16:37:23 PM	21	1253.00	TQEX
GENMAB A/S	04-Apr-2025	16:37:44 PM	27	1253.00	TQEX
GENMAB A/S	04-Apr-2025	16:40:30 PM	1	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:40:30 PM	22	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:40:36 PM	37	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:41:32 PM	25	1252.50	TQEX
GENMAB A/S	04-Apr-2025	16:41:38 PM	23	1252.50	TQEX
GENMAB A/S	04-Apr-2025	16:41:47 PM	10	1252.50	TQEX
GENMAB A/S	04-Apr-2025	16:42:17 PM	13	1252.50	TQEX
GENMAB A/S	04-Apr-2025	16:44:40 PM	46	1252.00	TQEX
GENMAB A/S	04-Apr-2025	16:45:11 PM	30	1251.00	TQEX
GENMAB A/S	04-Apr-2025	16:46:34 PM	24	1249.50	TQEX
GENMAB A/S	04-Apr-2025	16:47:28 PM	15	1249.00	TQEX
GENMAB A/S	04-Apr-2025	16:48:03 PM	21	1249.50	TQEX
GENMAB A/S	04-Apr-2025	16:48:06 PM	27	1249.50	TQEX
GENMAB A/S	04-Apr-2025	16:48:50 PM	15	1249.00	TQEX
GENMAB A/S	04-Apr-2025	16:49:33 PM	29	1248.50	TQEX
GENMAB A/S	04-Apr-2025	16:49:38 PM	6	1248.50	TQEX
GENMAB A/S	04-Apr-2025	16:49:38 PM	6	1248.50	TQEX
GENMAB A/S	04-Apr-2025	16:50:03 PM	55	1249.00	TQEX

110

​

​

Exhibit 99.1(b)

APPENDIX Share buy-back programme - Specification for April 3 – April 4, 2025

​

​

GENMAB A/S	04-Apr-2025	16:50:44 PM	39	1248.00	TQEX
GENMAB A/S	04-Apr-2025	16:51:34 PM	3	1250.50	TQEX
GENMAB A/S	04-Apr-2025	16:52:26 PM	47	1251.00	TQEX
GENMAB A/S	04-Apr-2025	16:53:17 PM	21	1251.00	TQEX
GENMAB A/S	04-Apr-2025	16:53:45 PM	20	1251.50	TQEX
GENMAB A/S	04-Apr-2025	16:54:28 PM	15	1253.00	TQEX
GENMAB A/S	04-Apr-2025	16:54:28 PM	4	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:54:28 PM	5	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:54:28 PM	15	1253.50	TQEX
GENMAB A/S	04-Apr-2025	16:54:42 PM	87	1252.50	TQEX

​

111

​

​