GMAB 0001558370-25-005115 6-K Filing: Apr 22, 2025

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

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

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)

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333-277273 and 333-284876) and to be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.

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

DATE: APRIL 22, 2025

EXHIBIT INDEX

O
Exhibit	Description of Exhibit

99.1	Company Announcement Dated April 22, 2025: Transactions in Connection with Share Buy-back Program

99.1(a)	Appendix Share buyback program – Specification for April 14 – April 18, 2025

Exhibit 99.1

Transactions in Connection with Share Buy-back Program

Company Announcement

COPENHAGEN, Denmark; April 22, 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.

The following transactions were executed under the program from April 14 to April 18, 2025:

	Trading Platform	No. of shares	Average price (DKK)	Total value (DKK)
Accumulated through last announcement		1,083,902		1,393,911,230.61
April 14, 2025	XCSE	52,871	1,269.11	67,099,100.80
	BCXE	26,940	1,269.12	34,190,092.80
	AQEU	4,700	1,268.67	5,962,749.00
	TQEX	5,000	1,268.47	6,342,350.00
	Total	89,511		113,594,292.60
April 15, 2025	XCSE	53,900	1,295.52	69,828,654.08
	BCXE	28,000	1,295.71	36,279,880.00
	AQEU	5,000	1,295.84,	6,479,200.00
	TQEX	5,000	1,295.64	6,478,200.00
	Total	91,900		119,065,934.08
April 16, 2025	XCSE	51,381	1,285.93	66,072,139.12
	BCXE	28,319	1,285.46	36,402,802.98
	AQEU	5,100	1,285.89	6,558,049.20
	TQEX	5,418	1,285.64	6,965,574.22
	Total	90,218		115,998,569.37
April 17, 2025	XCSE
	BCXE
	AQEU
	TQEX
	Total
April 18, 2025	XCSE
	BCXE
	AQEU
	TQEX
	Total
Total		271,629		348,658,796.05
Accumulated under the program		1,355,531		1,742,570,026.66

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


Genmab A/S	Tel: +45 7020 2728	Company Announcement no. 21
Carl Jacobsens Vej 30	Fax: +45 7020 2729	Page 1/2
2500 Valby, Denmark	www.genmab.com	CVR no. 2102 3884
		LEI Code 529900MTJPDPE4MHJ122

Transactions in Connection with Share Buy-back Program

Following these transactions, Genmab holds 1,808,284 shares as treasury shares, corresponding to 2.82% of the total share capital and voting rights.

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.

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.

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

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

Andrew Carlsen, Vice President, Head of Investor Relations

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

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.

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^®^.


Genmab A/S	Tel: +45 7020 2728	Company Announcement no. 21
Carl Jacobsens Vej 30	Fax: +45 7020 2729	Page 2/2
2500 Valby, Denmark	www.genmab.com	CVR no. 2102 3884
		LEI Code 529900MTJPDPE4MHJ122

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

Issuer	Date	Time CET	Quantity	Price (DKK)	Venue
GENMAB A/S	14-Apr-2025	9:55:18 AM	78	1259.50	XCSE
GENMAB A/S	14-Apr-2025	9:55:30 AM	82	1259.00	CEUX
GENMAB A/S	14-Apr-2025	9:55:32 AM	86	1258.50	XCSE
GENMAB A/S	14-Apr-2025	9:56:01 AM	76	1258.00	TQEX
GENMAB A/S	14-Apr-2025	9:56:14 AM	74	1258.00	AQEU
GENMAB A/S	14-Apr-2025	9:56:31 AM	84	1257.50	XCSE
GENMAB A/S	14-Apr-2025	9:56:31 AM	77	1257.50	CEUX
GENMAB A/S	14-Apr-2025	9:56:32 AM	76	1257.00	TQEX
GENMAB A/S	14-Apr-2025	9:56:32 AM	77	1256.50	CEUX
GENMAB A/S	14-Apr-2025	9:56:32 AM	3	1256.50	CEUX
GENMAB A/S	14-Apr-2025	9:56:32 AM	87	1257.00	AQEU
GENMAB A/S	14-Apr-2025	9:56:33 AM	38	1256.00	XCSE
GENMAB A/S	14-Apr-2025	9:56:33 AM	81	1256.00	TQEX
GENMAB A/S	14-Apr-2025	9:56:33 AM	83	1256.00	AQEU
GENMAB A/S	14-Apr-2025	10:00:33 AM	22	1258.00	XCSE
GENMAB A/S	14-Apr-2025	10:00:33 AM	53	1258.00	XCSE
GENMAB A/S	14-Apr-2025	10:00:33 AM	12	1258.00	XCSE
GENMAB A/S	14-Apr-2025	10:00:33 AM	25	1258.00	CEUX
GENMAB A/S	14-Apr-2025	10:00:58 AM	18	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:02:01 AM	85	1261.00	XCSE
GENMAB A/S	14-Apr-2025	10:02:01 AM	31	1261.00	TQEX
GENMAB A/S	14-Apr-2025	10:02:01 AM	15	1261.00	CEUX
GENMAB A/S	14-Apr-2025	10:02:01 AM	32	1261.00	CEUX
GENMAB A/S	14-Apr-2025	10:04:31 AM	52	1261.00	CEUX
GENMAB A/S	14-Apr-2025	10:04:39 AM	31	1260.50	XCSE
GENMAB A/S	14-Apr-2025	10:04:39 AM	53	1260.50	XCSE
GENMAB A/S	14-Apr-2025	10:04:39 AM	25	1260.50	TQEX
GENMAB A/S	14-Apr-2025	10:04:39 AM	8	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:04:39 AM	5	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:04:39 AM	7	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:06:13 AM	60	1261.00	CEUX
GENMAB A/S	14-Apr-2025	10:06:45 AM	88	1260.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	83	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	3	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	16	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	8	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	13	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	5	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	5	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	15	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:09:28 AM	8	1259.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	10:09:28 AM	30	1260.00	TQEX
GENMAB A/S	14-Apr-2025	10:09:28 AM	2	1259.00	TQEX
GENMAB A/S	14-Apr-2025	10:09:28 AM	5	1259.00	TQEX
GENMAB A/S	14-Apr-2025	10:09:28 AM	2	1259.00	TQEX
GENMAB A/S	14-Apr-2025	10:09:28 AM	7	1259.00	TQEX
GENMAB A/S	14-Apr-2025	10:09:28 AM	2	1259.00	TQEX
GENMAB A/S	14-Apr-2025	10:09:28 AM	6	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:09:28 AM	8	1259.00	CEUX
GENMAB A/S	14-Apr-2025	10:09:28 AM	2	1259.00	CEUX
GENMAB A/S	14-Apr-2025	10:09:28 AM	7	1259.00	CEUX
GENMAB A/S	14-Apr-2025	10:09:47 AM	39	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:09:56 AM	11	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:09:56 AM	10	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:09:56 AM	39	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:10:03 AM	39	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:10:30 AM	19	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:10:30 AM	39	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:10:58 AM	82	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:10:58 AM	50	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:10:58 AM	59	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:10:58 AM	3	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:10:58 AM	14	1259.00	CEUX
GENMAB A/S	14-Apr-2025	10:10:58 AM	29	1259.50	AQEU
GENMAB A/S	14-Apr-2025	10:11:00 AM	75	1258.50	XCSE
GENMAB A/S	14-Apr-2025	10:11:00 AM	13	1258.50	TQEX
GENMAB A/S	14-Apr-2025	10:11:00 AM	17	1258.50	TQEX
GENMAB A/S	14-Apr-2025	10:11:58 AM	9	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:11:58 AM	74	1259.50	XCSE
GENMAB A/S	14-Apr-2025	10:11:58 AM	84	1259.50	CEUX
GENMAB A/S	14-Apr-2025	10:12:17 AM	38	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:13:21 AM	21	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:13:21 AM	5	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:13:21 AM	48	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:13:21 AM	64	1260.00	XCSE
GENMAB A/S	14-Apr-2025	10:13:21 AM	27	1259.50	TQEX
GENMAB A/S	14-Apr-2025	10:13:21 AM	16	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:13:21 AM	11	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:13:21 AM	3	1260.00	CEUX
GENMAB A/S	14-Apr-2025	10:13:21 AM	24	1259.50	CEUX
GENMAB A/S	14-Apr-2025	10:13:21 AM	5	1259.50	CEUX
GENMAB A/S	14-Apr-2025	10:13:21 AM	10	1259.50	CEUX
GENMAB A/S	14-Apr-2025	10:13:21 AM	18	1259.50	CEUX
GENMAB A/S	14-Apr-2025	10:13:22 AM	76	1260.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	10:14:37 AM	6	1263.00	XCSE
GENMAB A/S	14-Apr-2025	10:14:48 AM	47	1263.50	XCSE
GENMAB A/S	14-Apr-2025	10:14:58 AM	84	1263.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:05 AM	84	1263.00	XCSE
GENMAB A/S	14-Apr-2025	10:15:05 AM	24	1263.50	XCSE
GENMAB A/S	14-Apr-2025	10:15:05 AM	39	1263.50	XCSE
GENMAB A/S	14-Apr-2025	10:15:05 AM	36	1263.50	XCSE
GENMAB A/S	14-Apr-2025	10:15:05 AM	42	1263.00	XCSE
GENMAB A/S	14-Apr-2025	10:15:05 AM	32	1263.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:05 AM	28	1263.00	AQEU
GENMAB A/S	14-Apr-2025	10:15:22 AM	87	1263.00	XCSE
GENMAB A/S	14-Apr-2025	10:15:22 AM	6	1263.00	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	9	1263.00	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	5	1263.00	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	5	1263.00	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	2	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	1	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	25	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	3	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	7	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	8	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	9	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	5	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:22 AM	3	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:15:23 AM	20	1262.50	CEUX
GENMAB A/S	14-Apr-2025	10:19:02 AM	41	1265.50	XCSE
GENMAB A/S	14-Apr-2025	10:19:08 AM	41	1265.50	XCSE
GENMAB A/S	14-Apr-2025	10:21:37 AM	20	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:40 AM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:40 AM	13	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:43 AM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:43 AM	21	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:43 AM	14	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:56 AM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:56 AM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:58 AM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:58 AM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:21:58 AM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:22:39 AM	11	1264.50	XCSE
GENMAB A/S	14-Apr-2025	10:22:39 AM	32	1265.00	TQEX
GENMAB A/S	14-Apr-2025	10:22:39 AM	49	1265.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:28 AM	12	1265.00	TQEX
GENMAB A/S	14-Apr-2025	10:23:28 AM	23	1265.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	10:23:30 AM	36	1265.00	CEUX
GENMAB A/S	14-Apr-2025	10:23:30 AM	36	1265.00	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	46	1264.50	XCSE
GENMAB A/S	14-Apr-2025	10:23:38 AM	3	1264.50	XCSE
GENMAB A/S	14-Apr-2025	10:23:38 AM	29	1264.50	XCSE
GENMAB A/S	14-Apr-2025	10:23:38 AM	8	1264.00	XCSE
GENMAB A/S	14-Apr-2025	10:23:38 AM	5	1264.00	TQEX
GENMAB A/S	14-Apr-2025	10:23:38 AM	13	1264.00	TQEX
GENMAB A/S	14-Apr-2025	10:23:38 AM	9	1264.00	TQEX
GENMAB A/S	14-Apr-2025	10:23:38 AM	6	1264.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	3	1264.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	34	1264.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	44	1264.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	26	1264.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	9	1263.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	2	1263.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	3	1263.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	4	1263.50	CEUX
GENMAB A/S	14-Apr-2025	10:23:38 AM	43	1264.50	AQEU
GENMAB A/S	14-Apr-2025	10:24:37 AM	86	1264.50	CEUX
GENMAB A/S	14-Apr-2025	10:26:23 AM	76	1264.50	CEUX
GENMAB A/S	14-Apr-2025	10:26:29 AM	71	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:26:43 AM	24	1265.00	AQEU
GENMAB A/S	14-Apr-2025	10:28:29 AM	12	1265.00	XCSE
GENMAB A/S	14-Apr-2025	10:29:42 AM	36	1267.50	XCSE
GENMAB A/S	14-Apr-2025	10:29:43 AM	36	1267.50	XCSE
GENMAB A/S	14-Apr-2025	10:29:43 AM	5	1267.50	XCSE
GENMAB A/S	14-Apr-2025	10:30:37 AM	91	1268.00	XCSE
GENMAB A/S	14-Apr-2025	10:30:37 AM	21	1268.00	XCSE
GENMAB A/S	14-Apr-2025	10:30:38 AM	90	1268.00	XCSE
GENMAB A/S	14-Apr-2025	10:30:38 AM	22	1268.00	XCSE
GENMAB A/S	14-Apr-2025	10:30:38 AM	91	1268.00	XCSE
GENMAB A/S	14-Apr-2025	10:30:38 AM	21	1268.00	XCSE
GENMAB A/S	14-Apr-2025	10:30:47 AM	48	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:30:47 AM	32	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:30:47 AM	32	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:30:47 AM	4	1269.00	CEUX
GENMAB A/S	14-Apr-2025	10:30:48 AM	31	1269.50	CEUX
GENMAB A/S	14-Apr-2025	10:30:50 AM	112	1270.00	XCSE
GENMAB A/S	14-Apr-2025	10:31:14 AM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	10:31:36 AM	34	1272.00	XCSE
GENMAB A/S	14-Apr-2025	10:32:02 AM	45	1272.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:02 AM	41	1272.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	10:32:03 AM	82	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:03 AM	31	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:03 AM	19	1272.50	TQEX
GENMAB A/S	14-Apr-2025	10:32:03 AM	7	1272.50	TQEX
GENMAB A/S	14-Apr-2025	10:32:03 AM	40	1273.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:03 AM	12	1273.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:03 AM	42	1272.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:03 AM	40	1272.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:03 AM	38	1273.00	AQEU
GENMAB A/S	14-Apr-2025	10:32:04 AM	47	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:04 AM	31	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:04 AM	34	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:04 AM	31	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:04 AM	32	1272.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:17 AM	31	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:17 AM	32	1272.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:18 AM	4	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:30 AM	89	1272.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:30 AM	39	1273.00	XCSE
GENMAB A/S	14-Apr-2025	10:32:30 AM	16	1273.00	XCSE
GENMAB A/S	14-Apr-2025	10:32:30 AM	30	1272.50	TQEX
GENMAB A/S	14-Apr-2025	10:32:30 AM	83	1272.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:30 AM	11	1272.50	AQEU
GENMAB A/S	14-Apr-2025	10:32:30 AM	32	1272.50	AQEU
GENMAB A/S	14-Apr-2025	10:32:39 AM	84	1271.50	XCSE
GENMAB A/S	14-Apr-2025	10:32:39 AM	27	1271.50	TQEX
GENMAB A/S	14-Apr-2025	10:32:39 AM	28	1271.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:39 AM	35	1271.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:39 AM	26	1271.50	CEUX
GENMAB A/S	14-Apr-2025	10:32:39 AM	28	1271.50	AQEU
GENMAB A/S	14-Apr-2025	10:33:08 AM	83	1270.50	XCSE
GENMAB A/S	14-Apr-2025	10:33:08 AM	8	1270.50	CEUX
GENMAB A/S	14-Apr-2025	10:33:09 AM	78	1270.50	CEUX
GENMAB A/S	14-Apr-2025	10:33:26 AM	25	1270.00	AQEU
GENMAB A/S	14-Apr-2025	10:33:55 AM	82	1269.00	XCSE
GENMAB A/S	14-Apr-2025	10:34:14 AM	85	1269.00	CEUX
GENMAB A/S	14-Apr-2025	10:34:32 AM	7	1268.00	CEUX
GENMAB A/S	14-Apr-2025	10:37:22 AM	22	1270.00	XCSE
GENMAB A/S	14-Apr-2025	10:37:22 AM	90	1270.00	XCSE
GENMAB A/S	14-Apr-2025	10:37:23 AM	12	1270.00	CEUX
GENMAB A/S	14-Apr-2025	10:37:23 AM	24	1270.00	CEUX
GENMAB A/S	14-Apr-2025	10:37:24 AM	32	1270.00	CEUX
GENMAB A/S	14-Apr-2025	10:37:24 AM	12	1270.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	10:37:24 AM	3	1270.00	CEUX
GENMAB A/S	14-Apr-2025	10:37:40 AM	22	1270.00	XCSE
GENMAB A/S	14-Apr-2025	10:37:40 AM	3	1270.00	XCSE
GENMAB A/S	14-Apr-2025	10:38:10 AM	31	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:38:21 AM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	10:38:21 AM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	10:38:30 AM	85	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:38:32 AM	27	1270.50	TQEX
GENMAB A/S	14-Apr-2025	10:40:00 AM	47	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:40:00 AM	65	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:41:47 AM	39	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:41:47 AM	35	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:41:47 AM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:41:47 AM	27	1271.00	XCSE
GENMAB A/S	14-Apr-2025	10:41:47 AM	1	1271.00	TQEX
GENMAB A/S	14-Apr-2025	10:41:47 AM	24	1271.00	TQEX
GENMAB A/S	14-Apr-2025	10:41:47 AM	3	1271.00	CEUX
GENMAB A/S	14-Apr-2025	10:41:47 AM	84	1271.00	CEUX
GENMAB A/S	14-Apr-2025	10:42:33 AM	83	1270.00	XCSE
GENMAB A/S	14-Apr-2025	10:42:33 AM	35	1270.00	XCSE
GENMAB A/S	14-Apr-2025	10:42:33 AM	82	1270.00	CEUX
GENMAB A/S	14-Apr-2025	10:42:33 AM	33	1270.00	AQEU
GENMAB A/S	14-Apr-2025	10:42:45 AM	17	1269.50	TQEX
GENMAB A/S	14-Apr-2025	10:43:07 AM	83	1269.00	CEUX
GENMAB A/S	14-Apr-2025	10:43:07 AM	27	1269.00	AQEU
GENMAB A/S	14-Apr-2025	10:43:07 AM	5	1269.00	AQEU
GENMAB A/S	14-Apr-2025	10:43:15 AM	58	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:43:15 AM	24	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:45:42 AM	10	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:46:59 AM	64	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:46:59 AM	20	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:46:59 AM	35	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:46:59 AM	26	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:46:59 AM	83	1268.50	CEUX
GENMAB A/S	14-Apr-2025	10:47:10 AM	26	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:47:10 AM	35	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:47:21 AM	28	1268.00	TQEX
GENMAB A/S	14-Apr-2025	10:49:09 AM	59	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:49:23 AM	21	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:49:34 AM	37	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:49:34 AM	26	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:49:34 AM	16	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:49:34 AM	33	1269.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	10:50:10 AM	11	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:50:10 AM	39	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:50:10 AM	23	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:50:40 AM	45	1269.00	XCSE
GENMAB A/S	14-Apr-2025	10:51:05 AM	3	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:51:05 AM	28	1268.50	TQEX
GENMAB A/S	14-Apr-2025	10:51:05 AM	86	1268.50	CEUX
GENMAB A/S	14-Apr-2025	10:51:05 AM	37	1268.50	AQEU
GENMAB A/S	14-Apr-2025	10:51:13 AM	83	1267.50	XCSE
GENMAB A/S	14-Apr-2025	10:51:13 AM	89	1267.50	CEUX
GENMAB A/S	14-Apr-2025	10:51:13 AM	34	1267.50	AQEU
GENMAB A/S	14-Apr-2025	10:53:59 AM	73	1267.50	XCSE
GENMAB A/S	14-Apr-2025	10:54:34 AM	89	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:54:34 AM	27	1268.50	TQEX
GENMAB A/S	14-Apr-2025	10:54:34 AM	89	1268.50	CEUX
GENMAB A/S	14-Apr-2025	10:54:34 AM	36	1268.50	AQEU
GENMAB A/S	14-Apr-2025	10:54:40 AM	35	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:54:40 AM	26	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:54:40 AM	10	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:56:09 AM	44	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:56:09 AM	42	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:56:09 AM	82	1268.50	CEUX
GENMAB A/S	14-Apr-2025	10:56:14 AM	25	1268.50	TQEX
GENMAB A/S	14-Apr-2025	10:56:29 AM	32	1268.00	AQEU
GENMAB A/S	14-Apr-2025	10:56:40 AM	48	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:56:40 AM	32	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:56:40 AM	21	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:56:40 AM	11	1268.50	XCSE
GENMAB A/S	14-Apr-2025	10:59:24 AM	84	1269.50	XCSE
GENMAB A/S	14-Apr-2025	10:59:30 AM	34	1269.50	XCSE
GENMAB A/S	14-Apr-2025	11:00:23 AM	31	1269.50	XCSE
GENMAB A/S	14-Apr-2025	11:00:23 AM	9	1270.00	CEUX
GENMAB A/S	14-Apr-2025	11:01:00 AM	12	1270.50	XCSE
GENMAB A/S	14-Apr-2025	11:01:00 AM	100	1270.50	XCSE
GENMAB A/S	14-Apr-2025	11:01:02 AM	36	1270.50	XCSE
GENMAB A/S	14-Apr-2025	11:01:34 AM	75	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:01:34 AM	5	1271.50	CEUX
GENMAB A/S	14-Apr-2025	11:03:43 AM	88	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:03:43 AM	27	1272.50	TQEX
GENMAB A/S	14-Apr-2025	11:03:43 AM	39	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:03:43 AM	47	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:03:43 AM	20	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:04:42 AM	5	1272.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	11:04:42 AM	89	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:04:42 AM	28	1273.00	AQEU
GENMAB A/S	14-Apr-2025	11:05:41 AM	35	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:05:41 AM	13	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:05:41 AM	41	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:05:41 AM	84	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:05:41 AM	25	1272.50	TQEX
GENMAB A/S	14-Apr-2025	11:05:41 AM	5	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:05:41 AM	5	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:05:41 AM	32	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:05:45 AM	32	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:06:34 AM	46	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:06:34 AM	26	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:06:39 AM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:06:39 AM	26	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:06:40 AM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:07:03 AM	29	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:07:03 AM	4	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:07:03 AM	82	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:07:03 AM	26	1271.50	TQEX
GENMAB A/S	14-Apr-2025	11:07:03 AM	5	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	5	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	87	1272.00	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	7	1271.00	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	2	1271.00	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	45	1271.00	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	24	1271.00	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	5	1271.00	CEUX
GENMAB A/S	14-Apr-2025	11:07:03 AM	28	1272.00	AQEU
GENMAB A/S	14-Apr-2025	11:08:27 AM	36	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:10:26 AM	39	1272.00	XCSE
GENMAB A/S	14-Apr-2025	11:10:26 AM	28	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:10:26 AM	11	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:10:26 AM	34	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:10:26 AM	25	1272.00	TQEX
GENMAB A/S	14-Apr-2025	11:10:26 AM	87	1272.00	CEUX
GENMAB A/S	14-Apr-2025	11:10:30 AM	43	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:10:40 AM	5	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:11:16 AM	21	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:11:20 AM	62	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:12:10 AM	35	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:12:10 AM	53	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:12:10 AM	25	1272.50	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	11:12:10 AM	25	1272.50	AQEU
GENMAB A/S	14-Apr-2025	11:14:42 AM	55	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:14:42 AM	12	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:14:42 AM	17	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:14:42 AM	28	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:15:55 AM	39	1274.00	CEUX
GENMAB A/S	14-Apr-2025	11:15:55 AM	28	1274.00	CEUX
GENMAB A/S	14-Apr-2025	11:16:12 AM	33	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:16:12 AM	15	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:16:12 AM	39	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:16:13 AM	49	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:17:02 AM	85	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:17:48 AM	32	1274.00	CEUX
GENMAB A/S	14-Apr-2025	11:18:16 AM	15	1273.50	TQEX
GENMAB A/S	14-Apr-2025	11:18:16 AM	46	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:18:16 AM	27	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:18:16 AM	12	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:18:17 AM	10	1273.50	TQEX
GENMAB A/S	14-Apr-2025	11:18:29 AM	39	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:18:29 AM	26	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:18:29 AM	21	1273.50	AQEU
GENMAB A/S	14-Apr-2025	11:18:29 AM	12	1273.50	AQEU
GENMAB A/S	14-Apr-2025	11:19:49 AM	55	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:18 AM	32	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:18 AM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:18 AM	12	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:18 AM	26	1272.50	TQEX
GENMAB A/S	14-Apr-2025	11:20:18 AM	25	1272.50	AQEU
GENMAB A/S	14-Apr-2025	11:20:20 AM	58	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:20 AM	11	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:20 AM	82	1272.00	CEUX
GENMAB A/S	14-Apr-2025	11:20:23 AM	3	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:25 AM	88	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:25 AM	50	1272.00	XCSE
GENMAB A/S	14-Apr-2025	11:20:25 AM	3	1272.00	XCSE
GENMAB A/S	14-Apr-2025	11:20:25 AM	58	1272.00	XCSE
GENMAB A/S	14-Apr-2025	11:20:25 AM	1	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:20:25 AM	47	1272.00	CEUX
GENMAB A/S	14-Apr-2025	11:20:25 AM	42	1272.00	CEUX
GENMAB A/S	14-Apr-2025	11:21:29 AM	31	1271.50	AQEU
GENMAB A/S	14-Apr-2025	11:22:17 AM	88	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:22:17 AM	25	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:22:17 AM	25	1271.50	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	11:23:09 AM	82	1271.00	CEUX
GENMAB A/S	14-Apr-2025	11:23:31 AM	38	1270.50	XCSE
GENMAB A/S	14-Apr-2025	11:23:31 AM	87	1270.00	XCSE
GENMAB A/S	14-Apr-2025	11:23:50 AM	35	1270.00	XCSE
GENMAB A/S	14-Apr-2025	11:24:18 AM	48	1270.00	XCSE
GENMAB A/S	14-Apr-2025	11:24:18 AM	34	1270.00	AQEU
GENMAB A/S	14-Apr-2025	11:26:33 AM	35	1270.00	XCSE
GENMAB A/S	14-Apr-2025	11:26:33 AM	13	1270.00	XCSE
GENMAB A/S	14-Apr-2025	11:26:33 AM	47	1270.00	XCSE
GENMAB A/S	14-Apr-2025	11:26:33 AM	75	1269.50	CEUX
GENMAB A/S	14-Apr-2025	11:26:33 AM	10	1269.50	CEUX
GENMAB A/S	14-Apr-2025	11:29:38 AM	89	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:29:38 AM	58	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:29:38 AM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:29:38 AM	25	1271.50	TQEX
GENMAB A/S	14-Apr-2025	11:29:38 AM	85	1271.50	CEUX
GENMAB A/S	14-Apr-2025	11:29:53 AM	10	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:29:53 AM	21	1271.50	XCSE
GENMAB A/S	14-Apr-2025	11:30:48 AM	22	1272.00	AQEU
GENMAB A/S	14-Apr-2025	11:31:44 AM	84	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:31:45 AM	51	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:31:45 AM	47	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:31:45 AM	14	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:31:45 AM	76	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:31:45 AM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:32:10 AM	10	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:32:10 AM	58	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:32:10 AM	44	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:32:57 AM	85	1274.00	XCSE
GENMAB A/S	14-Apr-2025	11:32:57 AM	25	1274.00	AQEU
GENMAB A/S	14-Apr-2025	11:32:57 AM	25	1274.50	TQEX
GENMAB A/S	14-Apr-2025	11:32:57 AM	83	1274.50	CEUX
GENMAB A/S	14-Apr-2025	11:35:50 AM	13	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:36:59 AM	84	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:36:59 AM	68	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:36:59 AM	15	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:36:59 AM	25	1273.50	TQEX
GENMAB A/S	14-Apr-2025	11:36:59 AM	75	1273.50	CEUX
GENMAB A/S	14-Apr-2025	11:37:00 AM	31	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:37:00 AM	11	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:37:13 AM	35	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:37:24 AM	27	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:37:26 AM	35	1273.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	11:37:26 AM	21	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:39:00 AM	31	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:39:00 AM	29	1272.50	AQEU
GENMAB A/S	14-Apr-2025	11:39:00 AM	26	1272.50	TQEX
GENMAB A/S	14-Apr-2025	11:39:00 AM	45	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:39:00 AM	3	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:39:30 AM	50	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:39:30 AM	58	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:39:49 AM	25	1272.00	CEUX
GENMAB A/S	14-Apr-2025	11:39:49 AM	1	1272.00	CEUX
GENMAB A/S	14-Apr-2025	11:40:43 AM	50	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:40:43 AM	12	1272.50	XCSE
GENMAB A/S	14-Apr-2025	11:41:29 AM	84	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:42:50 AM	37	1274.50	XCSE
GENMAB A/S	14-Apr-2025	11:43:30 AM	5	1274.50	XCSE
GENMAB A/S	14-Apr-2025	11:43:55 AM	44	1275.50	XCSE
GENMAB A/S	14-Apr-2025	11:44:20 AM	83	1275.50	XCSE
GENMAB A/S	14-Apr-2025	11:44:20 AM	25	1275.50	TQEX
GENMAB A/S	14-Apr-2025	11:45:17 AM	15	1275.50	CEUX
GENMAB A/S	14-Apr-2025	11:45:48 AM	39	1275.50	XCSE
GENMAB A/S	14-Apr-2025	11:46:19 AM	38	1275.50	XCSE
GENMAB A/S	14-Apr-2025	11:46:19 AM	55	1275.00	CEUX
GENMAB A/S	14-Apr-2025	11:46:19 AM	32	1275.00	CEUX
GENMAB A/S	14-Apr-2025	11:46:24 AM	26	1275.00	AQEU
GENMAB A/S	14-Apr-2025	11:46:30 AM	47	1275.00	XCSE
GENMAB A/S	14-Apr-2025	11:46:30 AM	35	1275.00	XCSE
GENMAB A/S	14-Apr-2025	11:46:30 AM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	11:46:30 AM	49	1274.50	XCSE
GENMAB A/S	14-Apr-2025	11:46:30 AM	36	1274.50	XCSE
GENMAB A/S	14-Apr-2025	11:46:30 AM	10	1274.00	CEUX
GENMAB A/S	14-Apr-2025	11:46:30 AM	2	1274.00	CEUX
GENMAB A/S	14-Apr-2025	11:47:37 AM	32	1274.50	CEUX
GENMAB A/S	14-Apr-2025	11:47:37 AM	25	1274.50	CEUX
GENMAB A/S	14-Apr-2025	11:48:01 AM	82	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:48:01 AM	26	1274.00	AQEU
GENMAB A/S	14-Apr-2025	11:48:01 AM	74	1274.00	CEUX
GENMAB A/S	14-Apr-2025	11:49:01 AM	24	1273.00	AQEU
GENMAB A/S	14-Apr-2025	11:49:01 AM	25	1273.00	TQEX
GENMAB A/S	14-Apr-2025	11:49:01 AM	86	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:50:09 AM	66	1272.00	XCSE
GENMAB A/S	14-Apr-2025	11:51:43 AM	9	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:54:34 AM	25	1272.50	TQEX
GENMAB A/S	14-Apr-2025	11:54:44 AM	22	1272.50	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	11:55:19 AM	16	1272.00	XCSE
GENMAB A/S	14-Apr-2025	11:55:57 AM	36	1272.50	CEUX
GENMAB A/S	14-Apr-2025	11:56:20 AM	29	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:56:20 AM	27	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:56:20 AM	11	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:56:20 AM	11	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:56:21 AM	10	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:56:21 AM	1	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:58:08 AM	42	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:58:08 AM	50	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:58:08 AM	42	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:58:08 AM	11	1273.00	XCSE
GENMAB A/S	14-Apr-2025	11:58:08 AM	6	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:59:13 AM	8	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	10	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	35	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	43	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	15	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	1	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	62	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	13	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:13 AM	37	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:14 AM	6	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:14 AM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:14 AM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:20 AM	10	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:20 AM	87	1273.00	CEUX
GENMAB A/S	14-Apr-2025	11:59:21 AM	38	1273.50	XCSE
GENMAB A/S	14-Apr-2025	11:59:51 AM	36	1274.00	CEUX
GENMAB A/S	14-Apr-2025	12:01:10 PM	84	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:01:10 PM	36	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:01:43 PM	47	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:01:43 PM	58	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:01:43 PM	7	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:01:43 PM	29	1274.00	AQEU
GENMAB A/S	14-Apr-2025	12:01:43 PM	35	1274.00	TQEX
GENMAB A/S	14-Apr-2025	12:01:44 PM	3	1274.00	CEUX
GENMAB A/S	14-Apr-2025	12:02:59 PM	33	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:02:59 PM	37	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:02:59 PM	2	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:04:04 PM	76	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:04:04 PM	8	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:04:04 PM	32	1276.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	12:04:04 PM	1	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:04:20 PM	74	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:04:20 PM	15	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:04:20 PM	36	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:04:20 PM	4	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:04:25 PM	36	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:05:01 PM	14	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:05:05 PM	39	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:05:27 PM	6	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:05:45 PM	5	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:05:45 PM	6	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:06:19 PM	6	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:06:19 PM	6	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:06:19 PM	36	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:06:30 PM	46	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:06:37 PM	18	1275.50	CEUX
GENMAB A/S	14-Apr-2025	12:06:38 PM	42	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:07:16 PM	25	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:08:11 PM	28	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:08:43 PM	83	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:09:01 PM	40	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:10:39 PM	63	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:10:41 PM	20	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:10:41 PM	6	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:11:05 PM	6	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:13:03 PM	15	1276.50	CEUX
GENMAB A/S	14-Apr-2025	12:13:13 PM	82	1276.50	CEUX
GENMAB A/S	14-Apr-2025	12:13:55 PM	48	1277.00	XCSE
GENMAB A/S	14-Apr-2025	12:14:27 PM	10	1277.00	XCSE
GENMAB A/S	14-Apr-2025	12:14:27 PM	23	1277.00	XCSE
GENMAB A/S	14-Apr-2025	12:16:12 PM	45	1277.00	XCSE
GENMAB A/S	14-Apr-2025	12:16:19 PM	78	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:16:19 PM	45	1276.50	AQEU
GENMAB A/S	14-Apr-2025	12:16:19 PM	3	1276.50	CEUX
GENMAB A/S	14-Apr-2025	12:17:07 PM	8	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:17:07 PM	2	1276.00	TQEX
GENMAB A/S	14-Apr-2025	12:17:07 PM	44	1276.00	TQEX
GENMAB A/S	14-Apr-2025	12:17:08 PM	44	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:17:08 PM	13	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:17:08 PM	44	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:17:09 PM	99	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:17:09 PM	13	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:17:09 PM	99	1276.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	12:17:09 PM	13	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:17:09 PM	1	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:19:43 PM	44	1276.50	CEUX
GENMAB A/S	14-Apr-2025	12:20:44 PM	49	1276.50	XCSE
GENMAB A/S	14-Apr-2025	12:20:44 PM	40	1276.50	CEUX
GENMAB A/S	14-Apr-2025	12:21:49 PM	36	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:49 PM	39	1276.00	AQEU
GENMAB A/S	14-Apr-2025	12:21:49 PM	15	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:21:49 PM	86	1275.50	CEUX
GENMAB A/S	14-Apr-2025	12:21:51 PM	36	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	36	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	23	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	13	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	35	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	10	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	31	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	11	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	11	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	43	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	36	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:21:53 PM	11	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:25:09 PM	84	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:45 PM	30	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:45 PM	10	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:45 PM	35	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:45 PM	37	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:46 PM	24	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:46 PM	10	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:46 PM	11	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:46 PM	30	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:46 PM	11	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:46 PM	26	1278.00	XCSE
GENMAB A/S	14-Apr-2025	12:27:56 PM	27	1277.50	XCSE
GENMAB A/S	14-Apr-2025	12:28:47 PM	47	1277.50	XCSE
GENMAB A/S	14-Apr-2025	12:29:03 PM	83	1277.00	XCSE
GENMAB A/S	14-Apr-2025	12:29:03 PM	38	1277.00	XCSE
GENMAB A/S	14-Apr-2025	12:29:03 PM	84	1277.00	CEUX
GENMAB A/S	14-Apr-2025	12:29:03 PM	10	1277.00	CEUX
GENMAB A/S	14-Apr-2025	12:30:13 PM	84	1276.00	CEUX
GENMAB A/S	14-Apr-2025	12:32:39 PM	66	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:34:13 PM	23	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:34:13 PM	10	1276.00	XCSE
GENMAB A/S	14-Apr-2025	12:34:13 PM	53	1276.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	12:34:13 PM	39	1276.00	AQEU
GENMAB A/S	14-Apr-2025	12:34:49 PM	84	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:34:49 PM	27	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:34:49 PM	11	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:34:49 PM	43	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:34:49 PM	31	1275.00	TQEX
GENMAB A/S	14-Apr-2025	12:34:49 PM	28	1275.00	AQEU
GENMAB A/S	14-Apr-2025	12:34:49 PM	36	1275.50	CEUX
GENMAB A/S	14-Apr-2025	12:34:49 PM	2	1275.50	CEUX
GENMAB A/S	14-Apr-2025	12:34:49 PM	47	1275.50	CEUX
GENMAB A/S	14-Apr-2025	12:34:49 PM	86	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:35:50 PM	51	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:35:50 PM	35	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:40:28 PM	31	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:40:28 PM	54	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:40:41 PM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:40:41 PM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:40:41 PM	1	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:40:41 PM	5	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:40:41 PM	5	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:40:41 PM	6	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:41:45 PM	35	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	43	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	34	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	13	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	43	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	13	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	13	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	30	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:41:45 PM	36	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:41:45 PM	5	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:41:45 PM	1	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:41:45 PM	48	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:41:45 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:09 PM	64	1273.50	XCSE
GENMAB A/S	14-Apr-2025	12:42:09 PM	1	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:09 PM	16	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:09 PM	13	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:09 PM	11	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:09 PM	22	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:10 PM	1	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:11 PM	2	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:23 PM	36	1274.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	12:42:23 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:23 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:23 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:23 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:23 PM	32	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:23 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:23 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:24 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:24 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:24 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:24 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:24 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:24 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:25 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:26 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:26 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:26 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:26 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:26 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:26 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:27 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:57 PM	15	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:57 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:57 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:57 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:57 PM	11	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:42:57 PM	7	1274.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	12:43:14 PM	24	1274.00	TQEX
GENMAB A/S	14-Apr-2025	12:43:14 PM	7	1274.00	TQEX
GENMAB A/S	14-Apr-2025	12:43:14 PM	25	1274.00	AQEU
GENMAB A/S	14-Apr-2025	12:43:14 PM	84	1274.00	CEUX
GENMAB A/S	14-Apr-2025	12:43:40 PM	47	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:43:40 PM	6	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:47:09 PM	23	1273.50	XCSE
GENMAB A/S	14-Apr-2025	12:47:15 PM	63	1274.00	TQEX
GENMAB A/S	14-Apr-2025	12:47:15 PM	67	1274.00	CEUX
GENMAB A/S	14-Apr-2025	12:47:47 PM	22	1274.00	CEUX
GENMAB A/S	14-Apr-2025	12:49:39 PM	35	1275.00	TQEX
GENMAB A/S	14-Apr-2025	12:49:53 PM	11	1275.00	TQEX
GENMAB A/S	14-Apr-2025	12:51:13 PM	12	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:51:13 PM	1	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:51:13 PM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:51:13 PM	34	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:51:13 PM	85	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:53:26 PM	49	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:26 PM	13	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:26 PM	43	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:26 PM	7	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:27 PM	14	1274.50	AQEU
GENMAB A/S	14-Apr-2025	12:53:29 PM	40	1274.50	AQEU
GENMAB A/S	14-Apr-2025	12:53:38 PM	83	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:53:39 PM	46	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:39 PM	12	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:39 PM	43	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:39 PM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:40 PM	10	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:40 PM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:40 PM	43	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:53:40 PM	48	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	28	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	12	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	12	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	13	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	43	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	10	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	43	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	12	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:54:54 PM	13	1275.50	XCSE
GENMAB A/S	14-Apr-2025	12:55:48 PM	45	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:56:09 PM	9	1274.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	12:56:09 PM	9	1274.00	TQEX
GENMAB A/S	14-Apr-2025	12:56:09 PM	13	1275.00	CEUX
GENMAB A/S	14-Apr-2025	12:56:15 PM	11	1274.50	XCSE
GENMAB A/S	14-Apr-2025	12:56:16 PM	1	1274.50	XCSE
GENMAB A/S	14-Apr-2025	12:56:20 PM	57	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:57:25 PM	86	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:57:25 PM	25	1275.00	TQEX
GENMAB A/S	14-Apr-2025	12:57:29 PM	27	1274.50	CEUX
GENMAB A/S	14-Apr-2025	12:57:30 PM	10	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:57:30 PM	32	1275.00	XCSE
GENMAB A/S	14-Apr-2025	12:58:08 PM	59	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:58:09 PM	28	1274.50	AQEU
GENMAB A/S	14-Apr-2025	12:58:11 PM	27	1274.00	XCSE
GENMAB A/S	14-Apr-2025	12:58:11 PM	26	1274.00	TQEX
GENMAB A/S	14-Apr-2025	1:00:08 PM	68	1274.00	XCSE
GENMAB A/S	14-Apr-2025	1:00:08 PM	36	1274.00	CEUX
GENMAB A/S	14-Apr-2025	1:00:23 PM	11	1274.00	CEUX
GENMAB A/S	14-Apr-2025	1:00:30 PM	26	1274.00	XCSE
GENMAB A/S	14-Apr-2025	1:01:16 PM	7	1274.00	XCSE
GENMAB A/S	14-Apr-2025	1:01:16 PM	47	1274.00	XCSE
GENMAB A/S	14-Apr-2025	1:01:16 PM	43	1274.00	XCSE
GENMAB A/S	14-Apr-2025	1:01:16 PM	5	1274.00	XCSE
GENMAB A/S	14-Apr-2025	1:02:50 PM	39	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:02:50 PM	43	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:02:50 PM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:02:50 PM	10	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:02:50 PM	9	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:04:40 PM	1	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:04:40 PM	43	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:04:40 PM	11	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:04:40 PM	12	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:04:40 PM	21	1275.00	XCSE
GENMAB A/S	14-Apr-2025	1:04:41 PM	36	1274.50	CEUX
GENMAB A/S	14-Apr-2025	1:06:23 PM	85	1274.00	CEUX
GENMAB A/S	14-Apr-2025	1:06:40 PM	88	1274.00	XCSE
GENMAB A/S	14-Apr-2025	1:06:40 PM	43	1274.50	XCSE
GENMAB A/S	14-Apr-2025	1:06:40 PM	12	1274.50	XCSE
GENMAB A/S	14-Apr-2025	1:06:40 PM	13	1274.50	XCSE
GENMAB A/S	14-Apr-2025	1:06:40 PM	4	1274.50	XCSE
GENMAB A/S	14-Apr-2025	1:06:40 PM	13	1274.50	XCSE
GENMAB A/S	14-Apr-2025	1:06:40 PM	27	1274.50	XCSE
GENMAB A/S	14-Apr-2025	1:06:40 PM	26	1274.00	TQEX
GENMAB A/S	14-Apr-2025	1:06:40 PM	30	1274.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	1:06:49 PM	10	1273.00	XCSE
GENMAB A/S	14-Apr-2025	1:06:49 PM	41	1273.50	AQEU
GENMAB A/S	14-Apr-2025	1:06:49 PM	2	1273.50	AQEU
GENMAB A/S	14-Apr-2025	1:06:49 PM	11	1273.50	AQEU
GENMAB A/S	14-Apr-2025	1:07:27 PM	77	1273.00	XCSE
GENMAB A/S	14-Apr-2025	1:07:27 PM	3	1273.50	CEUX
GENMAB A/S	14-Apr-2025	1:07:27 PM	9	1273.50	CEUX
GENMAB A/S	14-Apr-2025	1:07:27 PM	36	1273.50	CEUX
GENMAB A/S	14-Apr-2025	1:07:27 PM	1	1273.50	CEUX
GENMAB A/S	14-Apr-2025	1:07:27 PM	47	1273.50	CEUX
GENMAB A/S	14-Apr-2025	1:07:27 PM	4	1273.00	CEUX
GENMAB A/S	14-Apr-2025	1:07:27 PM	20	1273.00	CEUX
GENMAB A/S	14-Apr-2025	1:07:27 PM	64	1273.00	CEUX
GENMAB A/S	14-Apr-2025	1:07:48 PM	15	1272.50	TQEX
GENMAB A/S	14-Apr-2025	1:08:04 PM	33	1272.50	TQEX
GENMAB A/S	14-Apr-2025	1:08:04 PM	42	1272.50	AQEU
GENMAB A/S	14-Apr-2025	1:08:04 PM	12	1272.00	CEUX
GENMAB A/S	14-Apr-2025	1:08:04 PM	73	1272.00	CEUX
GENMAB A/S	14-Apr-2025	1:08:06 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:08:06 PM	74	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:12:33 PM	8	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:12:51 PM	74	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:13:00 PM	27	1271.00	TQEX
GENMAB A/S	14-Apr-2025	1:13:00 PM	27	1271.00	AQEU
GENMAB A/S	14-Apr-2025	1:13:00 PM	3	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:13:46 PM	11	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:13:46 PM	11	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:13:46 PM	43	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:13:47 PM	10	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:13:47 PM	43	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:13:47 PM	30	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:13:47 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:13:47 PM	11	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:14:13 PM	36	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:14:13 PM	49	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:14:13 PM	25	1271.00	TQEX
GENMAB A/S	14-Apr-2025	1:14:13 PM	25	1271.00	AQEU
GENMAB A/S	14-Apr-2025	1:14:58 PM	16	1270.00	AQEU
GENMAB A/S	14-Apr-2025	1:15:30 PM	89	1269.50	XCSE
GENMAB A/S	14-Apr-2025	1:16:27 PM	4	1270.00	CEUX
GENMAB A/S	14-Apr-2025	1:16:27 PM	26	1270.00	CEUX
GENMAB A/S	14-Apr-2025	1:16:28 PM	26	1270.00	TQEX
GENMAB A/S	14-Apr-2025	1:16:53 PM	86	1269.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	1:16:53 PM	86	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:18:29 PM	7	1268.50	XCSE
GENMAB A/S	14-Apr-2025	1:18:29 PM	25	1268.50	AQEU
GENMAB A/S	14-Apr-2025	1:18:29 PM	82	1268.50	CEUX
GENMAB A/S	14-Apr-2025	1:18:30 PM	85	1268.00	XCSE
GENMAB A/S	14-Apr-2025	1:18:53 PM	86	1269.00	XCSE
GENMAB A/S	14-Apr-2025	1:21:41 PM	89	1269.50	XCSE
GENMAB A/S	14-Apr-2025	1:21:41 PM	33	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:21:42 PM	27	1269.50	AQEU
GENMAB A/S	14-Apr-2025	1:21:42 PM	53	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:24:11 PM	13	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:24:11 PM	43	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:24:11 PM	31	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:24:11 PM	25	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:24:12 PM	13	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:24:53 PM	72	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:25:02 PM	12	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:25:02 PM	11	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:25:02 PM	25	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:25:02 PM	31	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:25:02 PM	33	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:25:02 PM	25	1269.50	TQEX
GENMAB A/S	14-Apr-2025	1:25:04 PM	84	1269.00	XCSE
GENMAB A/S	14-Apr-2025	1:25:04 PM	15	1269.50	AQEU
GENMAB A/S	14-Apr-2025	1:25:50 PM	82	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:25:50 PM	86	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:27:53 PM	11	1272.00	TQEX
GENMAB A/S	14-Apr-2025	1:27:58 PM	14	1272.00	TQEX
GENMAB A/S	14-Apr-2025	1:29:16 PM	87	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:29:16 PM	25	1272.00	XCSE
GENMAB A/S	14-Apr-2025	1:29:16 PM	41	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:29:16 PM	47	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:31:00 PM	49	1272.00	XCSE
GENMAB A/S	14-Apr-2025	1:31:20 PM	12	1272.00	XCSE
GENMAB A/S	14-Apr-2025	1:31:20 PM	21	1272.00	XCSE
GENMAB A/S	14-Apr-2025	1:31:45 PM	14	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:31:50 PM	13	1272.00	XCSE
GENMAB A/S	14-Apr-2025	1:31:50 PM	28	1272.00	XCSE
GENMAB A/S	14-Apr-2025	1:31:51 PM	17	1271.50	AQEU
GENMAB A/S	14-Apr-2025	1:32:02 PM	55	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:32:13 PM	84	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:32:13 PM	16	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:32:14 PM	9	1271.50	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	1:34:27 PM	41	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:34:27 PM	71	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:34:29 PM	25	1271.00	TQEX
GENMAB A/S	14-Apr-2025	1:34:29 PM	21	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:34:39 PM	83	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:34:39 PM	68	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:34:40 PM	13	1270.00	TQEX
GENMAB A/S	14-Apr-2025	1:34:40 PM	12	1270.00	AQEU
GENMAB A/S	14-Apr-2025	1:37:14 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:37:14 PM	22	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:37:14 PM	29	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:37:14 PM	31	1270.50	TQEX
GENMAB A/S	14-Apr-2025	1:38:10 PM	47	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:38:10 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:38:10 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:38:10 PM	41	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:38:10 PM	2	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:38:20 PM	85	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:40:59 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:44:09 PM	20	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:44:10 PM	12	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:44:10 PM	15	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:45:11 PM	31	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:45:11 PM	52	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:46:09 PM	41	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:46:09 PM	12	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:46:09 PM	22	1270.50	XCSE
GENMAB A/S	14-Apr-2025	1:46:09 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:46:09 PM	14	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:46:35 PM	26	1270.50	TQEX
GENMAB A/S	14-Apr-2025	1:47:39 PM	54	1269.50	XCSE
GENMAB A/S	14-Apr-2025	1:47:39 PM	14	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:48:58 PM	19	1270.00	AQEU
GENMAB A/S	14-Apr-2025	1:48:58 PM	36	1270.00	CEUX
GENMAB A/S	14-Apr-2025	1:48:58 PM	3	1270.00	CEUX
GENMAB A/S	14-Apr-2025	1:48:59 PM	50	1270.00	CEUX
GENMAB A/S	14-Apr-2025	1:48:59 PM	11	1270.00	CEUX
GENMAB A/S	14-Apr-2025	1:50:29 PM	35	1269.50	XCSE
GENMAB A/S	14-Apr-2025	1:50:29 PM	28	1269.50	TQEX
GENMAB A/S	14-Apr-2025	1:50:29 PM	2	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:50:29 PM	20	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:50:53 PM	63	1269.50	CEUX
GENMAB A/S	14-Apr-2025	1:51:10 PM	45	1270.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	1:51:42 PM	37	1270.00	CEUX
GENMAB A/S	14-Apr-2025	1:53:23 PM	6	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	35	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:23 PM	32	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:53:23 PM	11	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:53:23 PM	14	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:53:23 PM	30	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:53:23 PM	5	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:53:23 PM	6	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:53:37 PM	28	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:50 PM	24	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:50 PM	14	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:53:50 PM	19	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:54:49 PM	26	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:54:49 PM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:54:49 PM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:55:16 PM	42	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:55:16 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:55:16 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	1:55:16 PM	5	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:55:16 PM	5	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:55:17 PM	36	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:55:17 PM	5	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:55:17 PM	5	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:55:18 PM	36	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:56:02 PM	6	1271.50	CEUX
GENMAB A/S	14-Apr-2025	1:56:29 PM	35	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	4	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	34	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	30	1271.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	1:56:29 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	4	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:29 PM	36	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:56:29 PM	6	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:56:29 PM	5	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:56:29 PM	6	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:56:29 PM	1	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:56:29 PM	47	1271.00	CEUX
GENMAB A/S	14-Apr-2025	1:56:29 PM	30	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:56:30 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	31	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	33	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:30 PM	25	1270.50	TQEX
GENMAB A/S	14-Apr-2025	1:56:30 PM	16	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:56:30 PM	35	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:56:30 PM	6	1270.50	CEUX
GENMAB A/S	14-Apr-2025	1:56:40 PM	49	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:40 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:40 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:40 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:40 PM	17	1270.50	AQEU
GENMAB A/S	14-Apr-2025	1:56:44 PM	85	1270.00	XCSE
GENMAB A/S	14-Apr-2025	1:56:44 PM	35	1270.50	AQEU
GENMAB A/S	14-Apr-2025	1:58:10 PM	89	1269.00	XCSE
GENMAB A/S	14-Apr-2025	1:58:10 PM	22	1269.50	TQEX
GENMAB A/S	14-Apr-2025	1:58:10 PM	3	1269.50	TQEX
GENMAB A/S	14-Apr-2025	1:58:10 PM	32	1269.00	AQEU
GENMAB A/S	14-Apr-2025	1:58:10 PM	82	1269.00	CEUX
GENMAB A/S	14-Apr-2025	1:58:29 PM	82	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:00:13 PM	86	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:01:57 PM	42	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:01:57 PM	40	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:01:57 PM	35	1268.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:01:57 PM	12	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:02:01 PM	31	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:02:01 PM	13	1268.00	TQEX
GENMAB A/S	14-Apr-2025	2:03:04 PM	60	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:03:04 PM	7	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:03:04 PM	14	1268.00	TQEX
GENMAB A/S	14-Apr-2025	2:03:04 PM	26	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:03:04 PM	20	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:03:04 PM	28	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:03:04 PM	42	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:03:09 PM	8	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:04:19 PM	42	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:04:19 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:04:19 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:04:22 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:04:22 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:04:47 PM	2	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:04:52 PM	10	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:04:52 PM	43	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:04:52 PM	11	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:04:52 PM	11	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:04:52 PM	2	1269.00	TQEX
GENMAB A/S	14-Apr-2025	2:04:52 PM	2	1269.00	TQEX
GENMAB A/S	14-Apr-2025	2:05:11 PM	32	1269.00	TQEX
GENMAB A/S	14-Apr-2025	2:05:20 PM	11	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:05:20 PM	12	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:05:20 PM	43	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:05:20 PM	35	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:05:20 PM	11	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:05:34 PM	77	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:05:34 PM	6	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:05:34 PM	36	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:05:35 PM	32	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:05:35 PM	65	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:07:05 PM	24	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:08:49 PM	7	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:08:49 PM	43	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:08:49 PM	37	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:08:49 PM	4	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:08:49 PM	3	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:08:49 PM	6	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:08:49 PM	5	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:08:49 PM	1	1268.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:08:49 PM	24	1268.00	TQEX
GENMAB A/S	14-Apr-2025	2:08:49 PM	8	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:08:49 PM	37	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:08:49 PM	2	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:09:09 PM	3	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:09:29 PM	64	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:09:30 PM	5	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:09:30 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:09:30 PM	13	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:09:30 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:09:30 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:09:30 PM	7	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:09:48 PM	17	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:09:54 PM	31	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:09:54 PM	36	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:09:54 PM	11	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:09:54 PM	5	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:09:54 PM	6	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:09:54 PM	5	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:08 PM	6	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:09 PM	11	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:09 PM	6	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:09 PM	5	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:09 PM	3	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:09 PM	2	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:09 PM	5	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:09 PM	6	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:11 PM	35	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:10:11 PM	8	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:10:11 PM	31	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:10:14 PM	5	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:14 PM	5	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:14 PM	6	1268.50	CEUX
GENMAB A/S	14-Apr-2025	2:10:23 PM	10	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:11:05 PM	12	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:11:05 PM	14	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:11:11 PM	8	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:11:12 PM	66	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:11:12 PM	3	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:12:09 PM	20	1267.50	CEUX
GENMAB A/S	14-Apr-2025	2:12:09 PM	65	1267.00	CEUX
GENMAB A/S	14-Apr-2025	2:12:14 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:12:14 PM	15	1267.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:12:14 PM	48	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:13:05 PM	38	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:13:05 PM	20	1267.00	CEUX
GENMAB A/S	14-Apr-2025	2:13:16 PM	15	1267.00	AQEU
GENMAB A/S	14-Apr-2025	2:13:50 PM	43	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:13:50 PM	7	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:13:50 PM	43	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:13:50 PM	19	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:13:50 PM	36	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:13:50 PM	5	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:13:50 PM	6	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:13:50 PM	6	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:14:01 PM	87	1267.50	XCSE
GENMAB A/S	14-Apr-2025	2:14:01 PM	9	1267.50	TQEX
GENMAB A/S	14-Apr-2025	2:14:01 PM	14	1267.50	TQEX
GENMAB A/S	14-Apr-2025	2:14:01 PM	16	1267.50	TQEX
GENMAB A/S	14-Apr-2025	2:14:01 PM	33	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:14:01 PM	25	1267.50	CEUX
GENMAB A/S	14-Apr-2025	2:16:22 PM	35	1268.50	XCSE
GENMAB A/S	14-Apr-2025	2:16:22 PM	80	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:16:22 PM	2	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:16:22 PM	35	1268.00	TQEX
GENMAB A/S	14-Apr-2025	2:16:22 PM	15	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:16:22 PM	87	1268.00	CEUX
GENMAB A/S	14-Apr-2025	2:16:29 PM	16	1268.00	AQEU
GENMAB A/S	14-Apr-2025	2:17:59 PM	33	1267.50	TQEX
GENMAB A/S	14-Apr-2025	2:18:00 PM	21	1267.50	CEUX
GENMAB A/S	14-Apr-2025	2:18:52 PM	30	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:18:52 PM	50	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:18:52 PM	30	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:18:52 PM	2	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:18:52 PM	43	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:18:52 PM	43	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:18:52 PM	10	1267.50	TQEX
GENMAB A/S	14-Apr-2025	2:19:20 PM	19	1268.00	XCSE
GENMAB A/S	14-Apr-2025	2:19:51 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:19:51 PM	47	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:19:51 PM	5	1269.00	XCSE
GENMAB A/S	14-Apr-2025	2:21:37 PM	31	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:21:44 PM	45	1270.00	XCSE
GENMAB A/S	14-Apr-2025	2:21:44 PM	7	1270.00	XCSE
GENMAB A/S	14-Apr-2025	2:21:44 PM	60	1270.00	XCSE
GENMAB A/S	14-Apr-2025	2:21:44 PM	33	1270.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:21:44 PM	44	1270.00	CEUX
GENMAB A/S	14-Apr-2025	2:21:44 PM	35	1270.00	CEUX
GENMAB A/S	14-Apr-2025	2:21:56 PM	17	1270.00	CEUX
GENMAB A/S	14-Apr-2025	2:22:34 PM	9	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:22:38 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:22:38 PM	5	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:22:40 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:22:40 PM	6	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:23:42 PM	67	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:23:44 PM	2	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:23:46 PM	62	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:23:46 PM	21	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:24:00 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:24:00 PM	41	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:24:00 PM	43	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:24:00 PM	18	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:24:49 PM	85	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:26:49 PM	89	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:26:49 PM	112	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:26:49 PM	57	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:26:49 PM	30	1271.00	TQEX
GENMAB A/S	14-Apr-2025	2:26:49 PM	25	1270.00	TQEX
GENMAB A/S	14-Apr-2025	2:26:49 PM	36	1271.00	AQEU
GENMAB A/S	14-Apr-2025	2:26:49 PM	40	1270.00	AQEU
GENMAB A/S	14-Apr-2025	2:26:49 PM	84	1271.00	CEUX
GENMAB A/S	14-Apr-2025	2:26:49 PM	25	1271.00	CEUX
GENMAB A/S	14-Apr-2025	2:26:49 PM	25	1270.00	CEUX
GENMAB A/S	14-Apr-2025	2:26:51 PM	18	1269.50	CEUX
GENMAB A/S	14-Apr-2025	2:27:26 PM	1	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:27:26 PM	69	1269.50	CEUX
GENMAB A/S	14-Apr-2025	2:28:52 PM	42	1270.00	XCSE
GENMAB A/S	14-Apr-2025	2:28:52 PM	84	1269.50	XCSE
GENMAB A/S	14-Apr-2025	2:29:13 PM	76	1269.50	CEUX
GENMAB A/S	14-Apr-2025	2:32:19 PM	87	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	54	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	10	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	35	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	49	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	51	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:32:19 PM	7	1271.00	TQEX
GENMAB A/S	14-Apr-2025	2:32:19 PM	5	1271.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:32:19 PM	22	1271.00	TQEX
GENMAB A/S	14-Apr-2025	2:32:19 PM	84	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:32:19 PM	4	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:32:32 PM	9	1271.00	AQEU
GENMAB A/S	14-Apr-2025	2:32:44 PM	18	1271.00	AQEU
GENMAB A/S	14-Apr-2025	2:33:10 PM	54	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:33:10 PM	10	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:36:33 PM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:36:33 PM	54	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:36:33 PM	11	1272.50	CEUX
GENMAB A/S	14-Apr-2025	2:36:33 PM	28	1272.50	CEUX
GENMAB A/S	14-Apr-2025	2:38:04 PM	48	1274.50	XCSE
GENMAB A/S	14-Apr-2025	2:38:23 PM	48	1274.50	XCSE
GENMAB A/S	14-Apr-2025	2:38:23 PM	36	1274.50	CEUX
GENMAB A/S	14-Apr-2025	2:38:25 PM	48	1274.50	XCSE
GENMAB A/S	14-Apr-2025	2:38:26 PM	48	1274.50	XCSE
GENMAB A/S	14-Apr-2025	2:38:26 PM	48	1274.50	XCSE
GENMAB A/S	14-Apr-2025	2:38:26 PM	14	1274.50	CEUX
GENMAB A/S	14-Apr-2025	2:38:27 PM	48	1274.50	XCSE
GENMAB A/S	14-Apr-2025	2:40:36 PM	85	1273.50	XCSE
GENMAB A/S	14-Apr-2025	2:40:36 PM	45	1274.00	XCSE
GENMAB A/S	14-Apr-2025	2:40:36 PM	54	1274.00	XCSE
GENMAB A/S	14-Apr-2025	2:40:36 PM	19	1273.50	TQEX
GENMAB A/S	14-Apr-2025	2:40:36 PM	9	1273.50	TQEX
GENMAB A/S	14-Apr-2025	2:40:36 PM	8	1273.50	TQEX
GENMAB A/S	14-Apr-2025	2:40:37 PM	48	1274.00	XCSE
GENMAB A/S	14-Apr-2025	2:40:37 PM	54	1274.00	XCSE
GENMAB A/S	14-Apr-2025	2:40:37 PM	10	1274.00	XCSE
GENMAB A/S	14-Apr-2025	2:40:37 PM	61	1273.50	XCSE
GENMAB A/S	14-Apr-2025	2:40:37 PM	22	1273.50	XCSE
GENMAB A/S	14-Apr-2025	2:40:41 PM	85	1273.00	CEUX
GENMAB A/S	14-Apr-2025	2:40:47 PM	1	1272.50	AQEU
GENMAB A/S	14-Apr-2025	2:42:03 PM	38	1273.00	XCSE
GENMAB A/S	14-Apr-2025	2:42:03 PM	54	1273.00	XCSE
GENMAB A/S	14-Apr-2025	2:42:03 PM	84	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:42:03 PM	5	1272.50	TQEX
GENMAB A/S	14-Apr-2025	2:42:03 PM	30	1272.50	TQEX
GENMAB A/S	14-Apr-2025	2:42:03 PM	14	1272.50	AQEU
GENMAB A/S	14-Apr-2025	2:42:10 PM	21	1272.50	AQEU
GENMAB A/S	14-Apr-2025	2:42:10 PM	2	1272.50	AQEU
GENMAB A/S	14-Apr-2025	2:42:20 PM	84	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:42:20 PM	36	1272.50	CEUX
GENMAB A/S	14-Apr-2025	2:42:20 PM	88	1272.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:43:03 PM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:43:53 PM	82	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:43:53 PM	5	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:43:53 PM	25	1271.00	TQEX
GENMAB A/S	14-Apr-2025	2:43:53 PM	24	1271.00	AQEU
GENMAB A/S	14-Apr-2025	2:43:53 PM	36	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:43:54 PM	16	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:43:54 PM	6	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:43:58 PM	12	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:43:59 PM	11	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:43:59 PM	12	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:46:13 PM	12	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:46:13 PM	34	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:46:13 PM	47	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:46:13 PM	23	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:46:37 PM	51	1271.50	XCSE
GENMAB A/S	14-Apr-2025	2:46:37 PM	1	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:48:13 PM	40	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:13 PM	35	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:13 PM	19	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:13 PM	13	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:48:17 PM	12	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:17 PM	10	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:17 PM	40	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:17 PM	35	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:17 PM	41	1272.00	AQEU
GENMAB A/S	14-Apr-2025	2:48:18 PM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:48:18 PM	6	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:48:18 PM	48	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:48:18 PM	70	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:48:18 PM	13	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:48:30 PM	10	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:48:30 PM	40	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:48:30 PM	13	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:48:30 PM	47	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:30 PM	2	1272.50	XCSE
GENMAB A/S	14-Apr-2025	2:48:30 PM	17	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:48:30 PM	8	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:48:30 PM	62	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:49:30 PM	9	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:49:30 PM	40	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:49:30 PM	10	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:49:30 PM	13	1272.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:49:30 PM	35	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:49:31 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:49:31 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:49:31 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:49:31 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:49:32 PM	11	1272.00	CEUX
GENMAB A/S	14-Apr-2025	2:51:23 PM	40	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:51:23 PM	13	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:51:23 PM	59	1272.00	XCSE
GENMAB A/S	14-Apr-2025	2:51:23 PM	89	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:51:23 PM	86	1271.50	CEUX
GENMAB A/S	14-Apr-2025	2:52:49 PM	85	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:51 PM	2	1271.00	TQEX
GENMAB A/S	14-Apr-2025	2:53:51 PM	29	1271.00	TQEX
GENMAB A/S	14-Apr-2025	2:53:51 PM	4	1271.00	TQEX
GENMAB A/S	14-Apr-2025	2:53:51 PM	14	1271.00	AQEU
GENMAB A/S	14-Apr-2025	2:53:55 PM	35	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:55 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:55 PM	40	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:55 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:55 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:55 PM	3	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:55 PM	18	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:53:55 PM	2	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:53:55 PM	62	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:53:56 PM	9	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:56 PM	41	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:56 PM	3	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:56 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:56 PM	38	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:53:56 PM	7	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:54:00 PM	46	1270.00	XCSE
GENMAB A/S	14-Apr-2025	2:54:00 PM	41	1270.00	XCSE
GENMAB A/S	14-Apr-2025	2:54:00 PM	28	1270.00	TQEX
GENMAB A/S	14-Apr-2025	2:54:01 PM	5	1270.00	TQEX
GENMAB A/S	14-Apr-2025	2:54:01 PM	25	1270.00	AQEU
GENMAB A/S	14-Apr-2025	2:54:02 PM	84	1269.50	CEUX
GENMAB A/S	14-Apr-2025	2:54:20 PM	25	1269.50	TQEX
GENMAB A/S	14-Apr-2025	2:55:56 PM	17	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:55:56 PM	13	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:55:56 PM	11	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:56:08 PM	12	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:56:09 PM	11	1270.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	2:56:09 PM	13	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:56:20 PM	13	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:56:20 PM	11	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:56:21 PM	11	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:57:05 PM	21	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:57:09 PM	43	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:57:09 PM	18	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:57:34 PM	35	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:57:34 PM	39	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:57:34 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:57:34 PM	6	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:57:34 PM	6	1270.50	CEUX
GENMAB A/S	14-Apr-2025	2:58:20 PM	47	1270.50	XCSE
GENMAB A/S	14-Apr-2025	2:58:59 PM	6	1271.00	CEUX
GENMAB A/S	14-Apr-2025	2:58:59 PM	6	1271.00	CEUX
GENMAB A/S	14-Apr-2025	2:59:03 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:03 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:05 PM	22	1270.50	AQEU
GENMAB A/S	14-Apr-2025	2:59:10 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:10 PM	40	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:10 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:10 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:43 PM	24	1270.50	AQEU
GENMAB A/S	14-Apr-2025	2:59:50 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:50 PM	12	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:50 PM	40	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:50 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:50 PM	35	1271.00	XCSE
GENMAB A/S	14-Apr-2025	2:59:50 PM	2	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:00:07 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:00:07 PM	60	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:00:07 PM	28	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:00:08 PM	8	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:00:08 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:00:08 PM	15	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:01:08 PM	25	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:01:08 PM	58	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:01:08 PM	2	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:01:08 PM	8	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:01:08 PM	21	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:01:08 PM	18	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:01:08 PM	20	1269.50	CEUX
GENMAB A/S	14-Apr-2025	3:01:08 PM	36	1270.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:02:18 PM	20	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:03:32 PM	16	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:03:32 PM	50	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:04:13 PM	35	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	19	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	40	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	18	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	84	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	47	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	40	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	25	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:04:13 PM	49	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:04:13 PM	25	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:04:13 PM	37	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:04:13 PM	33	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:04:13 PM	59	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:04:13 PM	23	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:04:13 PM	89	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:04:15 PM	12	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:04:37 PM	34	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:04:47 PM	5	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:05:19 PM	23	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:05:20 PM	7	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:05:20 PM	11	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:05:20 PM	7	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:05:20 PM	40	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:05:20 PM	11	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:05:20 PM	12	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:07:23 PM	31	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:07:24 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:07:24 PM	73	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:07:43 PM	40	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:07:43 PM	11	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:07:43 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:07:43 PM	11	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:07:43 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:08:28 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:09:09 PM	3	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:09:38 PM	29	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:10:10 PM	14	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:10 PM	40	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:10 PM	40	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:10 PM	13	1270.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:10:11 PM	11	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:11 PM	12	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:11 PM	10	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:11 PM	10	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:24 PM	11	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:24 PM	10	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:24 PM	13	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:24 PM	11	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:24 PM	40	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:24 PM	10	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:24 PM	13	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:31 PM	12	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:31 PM	40	1270.50	XCSE
GENMAB A/S	14-Apr-2025	3:10:31 PM	84	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:10:38 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:10:53 PM	27	1270.00	AQEU
GENMAB A/S	14-Apr-2025	3:11:15 PM	41	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:11:15 PM	21	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:11:15 PM	13	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:11:40 PM	50	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	10	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	11	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	16	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	34	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	1	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:11:40 PM	50	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:12:40 PM	21	1270.50	AQEU
GENMAB A/S	14-Apr-2025	3:12:40 PM	36	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:12:45 PM	33	1270.50	TQEX
GENMAB A/S	14-Apr-2025	3:12:46 PM	10	1270.50	TQEX
GENMAB A/S	14-Apr-2025	3:14:31 PM	72	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:14:31 PM	2	1270.50	TQEX
GENMAB A/S	14-Apr-2025	3:14:40 PM	16	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:14:40 PM	19	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:14:40 PM	86	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:15:24 PM	112	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:15:24 PM	36	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:15:24 PM	9	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:15:30 PM	60	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:15:30 PM	27	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:15:33 PM	36	1270.00	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:15:59 PM	85	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:19:19 PM	40	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:19:27 PM	28	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:19:28 PM	1	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:20:01 PM	42	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:20:17 PM	45	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:20:49 PM	32	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:20:49 PM	49	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:20:49 PM	21	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:20:49 PM	32	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:20:49 PM	71	1273.00	TQEX
GENMAB A/S	14-Apr-2025	3:20:49 PM	25	1273.00	AQEU
GENMAB A/S	14-Apr-2025	3:20:49 PM	84	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:20:49 PM	36	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:20:49 PM	30	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:20:53 PM	32	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:20:53 PM	22	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:20:53 PM	40	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:20:53 PM	44	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:20:53 PM	36	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:22:14 PM	10	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:14 PM	40	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:14 PM	13	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:14 PM	35	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:14 PM	14	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	13	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	40	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	11	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	35	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:15 PM	2	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:16 PM	11	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:16 PM	40	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:18 PM	40	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:18 PM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:18 PM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:18 PM	71	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:22:18 PM	13	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:22:18 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:18 PM	11	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:22 PM	12	1273.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:22:33 PM	89	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:33 PM	43	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:22:33 PM	38	1273.50	AQEU
GENMAB A/S	14-Apr-2025	3:22:33 PM	76	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:33 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:33 PM	3	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:33 PM	10	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:45 PM	1	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:46 PM	1	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:22:50 PM	5	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:23:23 PM	10	1274.00	XCSE
GENMAB A/S	14-Apr-2025	3:23:23 PM	13	1274.00	XCSE
GENMAB A/S	14-Apr-2025	3:23:23 PM	11	1274.00	XCSE
GENMAB A/S	14-Apr-2025	3:23:24 PM	10	1274.00	XCSE
GENMAB A/S	14-Apr-2025	3:23:43 PM	78	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:23:43 PM	8	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:23:43 PM	50	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:23:43 PM	22	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:23:43 PM	8	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:23:43 PM	4	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:23:56 PM	30	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:23:56 PM	11	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:23:56 PM	9	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:23:56 PM	47	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:23:57 PM	43	1273.50	XCSE
GENMAB A/S	14-Apr-2025	3:23:57 PM	12	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:24:07 PM	34	1273.00	TQEX
GENMAB A/S	14-Apr-2025	3:24:07 PM	9	1273.00	TQEX
GENMAB A/S	14-Apr-2025	3:24:07 PM	36	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:24:07 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	3:25:29 PM	75	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:25:29 PM	10	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:25:31 PM	17	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:25:31 PM	10	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:25:31 PM	11	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:25:31 PM	16	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:25:31 PM	10	1273.00	XCSE
GENMAB A/S	14-Apr-2025	3:26:09 PM	10	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:26:09 PM	8	1273.00	CEUX
GENMAB A/S	14-Apr-2025	3:26:33 PM	1	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:26:33 PM	83	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:27:19 PM	6	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:27:19 PM	61	1272.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:27:21 PM	3	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:29 PM	1	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	2	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	2	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	2	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	2	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	2	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	2	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	3	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:27:50 PM	8	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:28:03 PM	1	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:28:03 PM	1	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:28:03 PM	63	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:28:03 PM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:33 PM	11	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:28:33 PM	76	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:33 PM	9	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:34 PM	26	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:28:35 PM	17	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:28:40 PM	14	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:28:40 PM	22	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:40 PM	40	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:40 PM	35	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:40 PM	15	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:40 PM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:40 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:40 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:40 PM	48	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	35	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:41 PM	40	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:41 PM	37	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:41 PM	13	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:41 PM	11	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:41 PM	13	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:41 PM	18	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:28:41 PM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	6	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	15	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	17	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	21	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	6	1272.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:28:41 PM	6	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:41 PM	6	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:28:42 PM	6	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:29:02 PM	41	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:29:02 PM	12	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:29:10 PM	7	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:10 PM	48	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:10 PM	10	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:10 PM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:10 PM	10	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:11 PM	12	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:11 PM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:11 PM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:15 PM	6	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:15 PM	63	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:29:15 PM	19	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:00 PM	35	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:00 PM	12	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:00 PM	40	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:00 PM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:01 PM	4	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:01 PM	7	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:01 PM	2	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:01 PM	12	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:01 PM	36	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:01 PM	1	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:01 PM	49	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:10 PM	86	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:10 PM	22	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:10 PM	3	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:10 PM	5	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:10 PM	15	1272.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:10 PM	50	1272.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:10 PM	2	1272.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:10 PM	45	1272.00	AQEU
GENMAB A/S	14-Apr-2025	3:30:22 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:22 PM	6	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:22 PM	5	1272.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	3	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:23 PM	5	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:23 PM	2	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:23 PM	5	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:23 PM	2	1271.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:30:23 PM	5	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:23 PM	2	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:23 PM	3	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:23 PM	1	1271.00	TQEX
GENMAB A/S	14-Apr-2025	3:30:23 PM	1	1271.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	2	1271.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	10	1271.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	3	1271.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	2	1271.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	4	1271.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	4	1271.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	4	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	3	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:23 PM	4	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:26 PM	8	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	7	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	3	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	7	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	22	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	8	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	11	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	12	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	1	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	21	1271.50	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	64	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	3	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	21	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:26 PM	3	1271.00	AQEU
GENMAB A/S	14-Apr-2025	3:30:26 PM	3	1271.00	AQEU
GENMAB A/S	14-Apr-2025	3:30:26 PM	20	1271.00	AQEU
GENMAB A/S	14-Apr-2025	3:30:26 PM	6	1271.00	AQEU
GENMAB A/S	14-Apr-2025	3:30:26 PM	24	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:26 PM	20	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:26 PM	33	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:26 PM	6	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:26 PM	6	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:26 PM	42	1271.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:28 PM	13	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:29 PM	10	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:29 PM	13	1271.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:30:30 PM	11	1271.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:36 PM	7	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	7	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	4	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	3	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	12	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	12	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	6	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:36 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:38 PM	3	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:38 PM	3	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:38 PM	2	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:38 PM	3	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:39 PM	86	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:39 PM	26	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:30:41 PM	40	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:30:41 PM	5	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:30:41 PM	2	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:30:41 PM	3	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:30:41 PM	2	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:30:41 PM	10	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:30:41 PM	2	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:30:41 PM	5	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:30:41 PM	4	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:30:41 PM	3	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:30:41 PM	1	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:31:16 PM	88	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	22	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	19	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	40	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	11	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	2	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	9	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	9	1270.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	88	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:31:16 PM	32	1270.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:16 PM	1	1269.50	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:31:16 PM	34	1270.00	AQEU
GENMAB A/S	14-Apr-2025	3:31:16 PM	37	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:31:16 PM	2	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:16 PM	4	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:16 PM	21	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:16 PM	5	1270.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:16 PM	71	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:31:16 PM	11	1270.00	CEUX
GENMAB A/S	14-Apr-2025	3:31:16 PM	83	1269.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:24 PM	18	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	3	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	7	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	8	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	75	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:31:24 PM	19	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:24 PM	6	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:24 PM	4	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:24 PM	2	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:24 PM	2	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:24 PM	2	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:24 PM	6	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:31:24 PM	4	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:24 PM	20	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:24 PM	7	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:38 PM	9	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:31:38 PM	4	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:31:38 PM	2	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:31:38 PM	5	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:31:38 PM	8	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:31:38 PM	4	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:38 PM	35	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:38 PM	17	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:31:49 PM	85	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:31:49 PM	82	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:17 PM	55	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:32:21 PM	86	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:21 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:21 PM	9	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:21 PM	25	1269.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:32:21 PM	30	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:32:25 PM	82	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	15	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	40	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	11	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	5	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	6	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	14	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	75	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:25 PM	33	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:32:25 PM	25	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:32:25 PM	6	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:32:25 PM	14	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:32:25 PM	68	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:32:25 PM	35	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:32:25 PM	51	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:32:33 PM	20	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	68	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	3	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	7	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	4	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	2	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	3	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	19	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	2	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	5	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	3	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	6	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	6	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	40	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:33 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:32:38 PM	7	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:38 PM	7	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:38 PM	11	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:38 PM	13	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:41 PM	9	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:41 PM	5	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:41 PM	3	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:41 PM	10	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:41 PM	2	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:41 PM	11	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:32:41 PM	47	1265.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:32:41 PM	6	1265.50	AQEU
GENMAB A/S	14-Apr-2025	3:32:41 PM	25	1265.50	AQEU
GENMAB A/S	14-Apr-2025	3:32:41 PM	3	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:41 PM	5	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:41 PM	12	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:41 PM	15	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:41 PM	15	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:32:49 PM	64	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:33:02 PM	25	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:33:11 PM	79	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:11 PM	9	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:11 PM	6	1265.00	TQEX
GENMAB A/S	14-Apr-2025	3:33:11 PM	4	1265.00	TQEX
GENMAB A/S	14-Apr-2025	3:33:39 PM	2	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:55 PM	83	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:55 PM	112	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:55 PM	50	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:55 PM	21	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:55 PM	40	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:33:55 PM	1	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:33:55 PM	28	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:33:55 PM	4	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:33:55 PM	8	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:33:55 PM	7	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:33:55 PM	5	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:33:55 PM	1	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:33:55 PM	10	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:33:55 PM	30	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:33:55 PM	48	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:06 PM	2	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	2	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	5	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	79	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	11	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	5	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	3	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	2	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	5	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	2	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	13	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	40	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	23	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:34:06 PM	8	1264.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:34:06 PM	15	1264.00	TQEX
GENMAB A/S	14-Apr-2025	3:34:06 PM	3	1264.00	TQEX
GENMAB A/S	14-Apr-2025	3:34:06 PM	2	1264.00	TQEX
GENMAB A/S	14-Apr-2025	3:34:06 PM	4	1264.00	TQEX
GENMAB A/S	14-Apr-2025	3:34:06 PM	4	1264.00	TQEX
GENMAB A/S	14-Apr-2025	3:34:06 PM	3	1263.50	AQEU
GENMAB A/S	14-Apr-2025	3:34:06 PM	20	1263.50	AQEU
GENMAB A/S	14-Apr-2025	3:34:06 PM	5	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:06 PM	8	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:06 PM	12	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:06 PM	28	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:06 PM	15	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:06 PM	10	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:06 PM	4	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:34:12 PM	30	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:15 PM	23	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:15 PM	31	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:15 PM	5	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:15 PM	83	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:15 PM	25	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:34:15 PM	5	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	5	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	15	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	4	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	3	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	4	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	3	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	2	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	3	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	2	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	4	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:15 PM	10	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:16 PM	7	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:34:16 PM	15	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:34:16 PM	4	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:34:17 PM	85	1263.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:17 PM	10	1263.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:17 PM	10	1263.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:17 PM	10	1263.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:17 PM	10	1263.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:17 PM	13	1263.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:17 PM	25	1263.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:18 PM	4	1262.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:34:18 PM	28	1262.00	XCSE
GENMAB A/S	14-Apr-2025	3:34:18 PM	3	1262.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:18 PM	4	1262.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:18 PM	2	1262.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:18 PM	5	1262.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:18 PM	25	1262.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:18 PM	16	1262.00	CEUX
GENMAB A/S	14-Apr-2025	3:34:19 PM	35	1262.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:02 PM	4	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:35:02 PM	3	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:35:02 PM	2	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:35:02 PM	3	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:35:02 PM	9	1263.50	TQEX
GENMAB A/S	14-Apr-2025	3:35:02 PM	3	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:02 PM	5	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:02 PM	11	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:02 PM	3	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:02 PM	13	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:02 PM	7	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:18 PM	2	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:35:18 PM	2	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:35:18 PM	2	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:35:18 PM	7	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:35:18 PM	19	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:35:19 PM	7	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:35:19 PM	3	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:35:19 PM	2	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:35:19 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:35:19 PM	4	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:35:19 PM	3	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:35:19 PM	3	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:35:19 PM	2	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:35:21 PM	28	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:21 PM	5	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:35:21 PM	5	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:35:21 PM	15	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:35:21 PM	3	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:35:21 PM	22	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:35:21 PM	52	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:35:25 PM	59	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:25 PM	15	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:25 PM	7	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:25 PM	5	1264.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:35:25 PM	3	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:25 PM	6	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:25 PM	48	1264.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:50 PM	76	1263.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:50 PM	14	1262.50	TQEX
GENMAB A/S	14-Apr-2025	3:35:50 PM	2	1262.50	TQEX
GENMAB A/S	14-Apr-2025	3:35:50 PM	43	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:51 PM	10	1262.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:51 PM	2	1262.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:51 PM	2	1262.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:51 PM	28	1262.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:51 PM	3	1262.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:51 PM	2	1262.50	CEUX
GENMAB A/S	14-Apr-2025	3:35:58 PM	1	1262.00	XCSE
GENMAB A/S	14-Apr-2025	3:35:58 PM	1	1262.00	XCSE
GENMAB A/S	14-Apr-2025	3:36:07 PM	8	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:07 PM	12	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:07 PM	2	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:07 PM	13	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:07 PM	4	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:07 PM	5	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:13 PM	21	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:16 PM	17	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:17 PM	6	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:36:49 PM	5	1264.50	TQEX
GENMAB A/S	14-Apr-2025	3:36:50 PM	11	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:36:50 PM	12	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:36:50 PM	13	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:36:50 PM	13	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:36:50 PM	27	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:36:50 PM	25	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:36:50 PM	10	1264.50	TQEX
GENMAB A/S	14-Apr-2025	3:36:50 PM	19	1264.50	TQEX
GENMAB A/S	14-Apr-2025	3:37:04 PM	40	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	18	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	25	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	3	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	22	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	4	1265.00	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	1	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	3	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	2	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	3	1264.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:37:04 PM	3	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	2	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:37:04 PM	25	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:37:04 PM	17	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:04 PM	2	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:04 PM	14	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:04 PM	4	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:04 PM	2	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:05 PM	6	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:06 PM	71	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:37:06 PM	40	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:06 PM	3	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:06 PM	3	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:06 PM	18	1263.50	CEUX
GENMAB A/S	14-Apr-2025	3:37:40 PM	5	1265.00	TQEX
GENMAB A/S	14-Apr-2025	3:37:40 PM	5	1265.00	TQEX
GENMAB A/S	14-Apr-2025	3:37:40 PM	5	1265.00	TQEX
GENMAB A/S	14-Apr-2025	3:37:40 PM	5	1265.00	TQEX
GENMAB A/S	14-Apr-2025	3:37:43 PM	2	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:37:50 PM	5	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:38:02 PM	84	1264.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:02 PM	5	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:38:02 PM	2	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:38:02 PM	13	1265.00	AQEU
GENMAB A/S	14-Apr-2025	3:38:29 PM	85	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:29 PM	7	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:29 PM	38	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:29 PM	15	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:29 PM	15	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:29 PM	12	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:56 PM	84	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:56 PM	19	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:56 PM	40	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:56 PM	5	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:56 PM	9	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:56 PM	39	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:38:56 PM	34	1265.50	TQEX
GENMAB A/S	14-Apr-2025	3:38:56 PM	4	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:56 PM	15	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:56 PM	5	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:38:56 PM	20	1264.50	CEUX
GENMAB A/S	14-Apr-2025	3:39:39 PM	32	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:39:41 PM	35	1266.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:39:41 PM	49	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:41 PM	19	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:41 PM	10	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:41 PM	10	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:41 PM	11	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:41 PM	4	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:39:41 PM	4	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:39:41 PM	32	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:39:50 PM	35	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	18	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	40	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	11	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	8	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	5	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	11	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	6	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	10	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:50 PM	40	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:39:56 PM	1	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:39:59 PM	21	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:39:59 PM	32	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:40:09 PM	5	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:40:09 PM	40	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:40:09 PM	36	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:40:09 PM	24	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:40:09 PM	1	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:40:12 PM	34	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:40:13 PM	83	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:40:13 PM	2	1265.50	TQEX
GENMAB A/S	14-Apr-2025	3:40:13 PM	32	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:40:13 PM	5	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:14 PM	14	1265.50	TQEX
GENMAB A/S	14-Apr-2025	3:40:14 PM	15	1265.50	TQEX
GENMAB A/S	14-Apr-2025	3:40:14 PM	10	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:14 PM	11	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:14 PM	2	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:14 PM	3	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:14 PM	9	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:14 PM	15	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:14 PM	33	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:40:32 PM	84	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:40:32 PM	1	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:40:59 PM	4	1267.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:40:59 PM	27	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:40:59 PM	32	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:41:03 PM	35	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:41:03 PM	8	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:41:03 PM	13	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:41:03 PM	24	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:41:19 PM	83	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:41:33 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:41:33 PM	14	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:41:33 PM	77	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:41:40 PM	8	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:41:45 PM	6	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:41:45 PM	10	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:41:45 PM	5	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:41:45 PM	5	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:42:06 PM	3	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	1	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	5	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	3	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	10	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	2	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	3	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	4	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	4	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	10	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	22	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	35	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	11	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	5	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	5	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	1	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	2	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	2	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:06 PM	3	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	2	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	3	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	2	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	2	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	3	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	10	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	32	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	15	1266.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:42:06 PM	40	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:06 PM	2	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:07 PM	63	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:11 PM	11	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:18 PM	87	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:18 PM	11	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:18 PM	61	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:18 PM	1	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:37 PM	84	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:42:37 PM	5	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:42:37 PM	2	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:42:37 PM	3	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:42:37 PM	2	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:42:37 PM	8	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:42:37 PM	4	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:42:37 PM	27	1267.00	AQEU
GENMAB A/S	14-Apr-2025	3:42:37 PM	7	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:37 PM	2	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:37 PM	12	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:37 PM	13	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:37 PM	7	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:37 PM	3	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:42:37 PM	11	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:43:16 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:43:16 PM	13	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:43:16 PM	24	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:43:16 PM	74	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:16 PM	9	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:16 PM	28	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:43:16 PM	15	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:43:16 PM	41	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:43:32 PM	36	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:32 PM	26	1267.00	AQEU
GENMAB A/S	14-Apr-2025	3:43:40 PM	47	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:40 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:40 PM	23	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:40 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:40 PM	2	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:43:50 PM	55	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:43:50 PM	30	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:43:50 PM	15	1266.00	TQEX
GENMAB A/S	14-Apr-2025	3:43:50 PM	12	1266.00	TQEX
GENMAB A/S	14-Apr-2025	3:43:50 PM	4	1266.00	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:43:50 PM	9	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:43:50 PM	10	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:43:50 PM	15	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:43:50 PM	14	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:43:56 PM	85	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:43:56 PM	6	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:43:56 PM	76	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:44:08 PM	83	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:44:38 PM	27	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:44:55 PM	20	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:44:55 PM	39	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:44:56 PM	10	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:44:56 PM	8	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:44:56 PM	12	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:44:56 PM	12	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:44:56 PM	40	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:44:59 PM	83	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:45:44 PM	48	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:45:44 PM	37	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:45:44 PM	2	1267.00	AQEU
GENMAB A/S	14-Apr-2025	3:45:44 PM	25	1267.00	AQEU
GENMAB A/S	14-Apr-2025	3:45:44 PM	69	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:45:44 PM	13	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:45:45 PM	4	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:45:47 PM	25	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:45:48 PM	7	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:45:48 PM	11	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:45:48 PM	11	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:45:48 PM	4	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:45:51 PM	2	1266.00	TQEX
GENMAB A/S	14-Apr-2025	3:45:51 PM	23	1266.00	TQEX
GENMAB A/S	14-Apr-2025	3:45:51 PM	14	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:46:26 PM	8	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:46:33 PM	66	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:46:34 PM	23	1266.50	CEUX
GENMAB A/S	14-Apr-2025	3:46:37 PM	1	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:46:37 PM	1	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:46:37 PM	81	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:46:37 PM	23	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:46:37 PM	2	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:47:05 PM	50	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:05 PM	20	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:05 PM	33	1266.00	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:47:05 PM	36	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:47:05 PM	82	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:47:21 PM	35	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	21	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	40	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	13	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	3	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	49	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	3	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	40	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	11	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:21 PM	9	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:22 PM	23	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:22 PM	13	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:22 PM	12	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:22 PM	12	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:22 PM	40	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:47:23 PM	87	1265.50	XCSE
GENMAB A/S	14-Apr-2025	3:47:23 PM	25	1265.50	TQEX
GENMAB A/S	14-Apr-2025	3:47:23 PM	4	1264.50	TQEX
GENMAB A/S	14-Apr-2025	3:47:23 PM	4	1264.50	TQEX
GENMAB A/S	14-Apr-2025	3:47:23 PM	3	1264.50	TQEX
GENMAB A/S	14-Apr-2025	3:47:23 PM	2	1264.50	TQEX
GENMAB A/S	14-Apr-2025	3:47:23 PM	32	1265.50	CEUX
GENMAB A/S	14-Apr-2025	3:47:23 PM	59	1265.00	CEUX
GENMAB A/S	14-Apr-2025	3:48:07 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:16 PM	16	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:16 PM	26	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:18 PM	7	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:49 PM	36	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:49 PM	2	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:49 PM	48	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	89	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:58 PM	4	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:48:58 PM	20	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:48:58 PM	33	1267.00	AQEU
GENMAB A/S	14-Apr-2025	3:48:58 PM	32	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:48:58 PM	4	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	3	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	21	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	5	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	5	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	6	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	3	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	4	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	5	1267.50	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	3	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	2	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:48:58 PM	50	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:48:59 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	21	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	4	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	8	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	7	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	21	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	10	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:48:59 PM	14	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:49:03 PM	86	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:49:08 PM	87	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:49:56 PM	44	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:49:56 PM	42	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:07 PM	82	1269.50	CEUX
GENMAB A/S	14-Apr-2025	3:50:29 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:29 PM	25	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:29 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:29 PM	34	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:29 PM	5	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:50:29 PM	5	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:50:29 PM	5	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:50:29 PM	11	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:50:29 PM	11	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:50:29 PM	2	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:50:29 PM	18	1269.50	AQEU
GENMAB A/S	14-Apr-2025	3:50:35 PM	8	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:35 PM	11	1269.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:50:35 PM	1	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:50:36 PM	7	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:36 PM	3	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:43 PM	20	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:43 PM	40	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:43 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:43 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:43 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:43 PM	84	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:50:44 PM	40	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:50:44 PM	15	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:50:44 PM	25	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:50:48 PM	31	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:50:49 PM	86	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:49 PM	3	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:50:49 PM	33	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:51:07 PM	67	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:51:28 PM	20	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:51:28 PM	11	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:51:28 PM	4	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:51:28 PM	2	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:51:28 PM	4	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:51:28 PM	4	1268.00	TQEX
GENMAB A/S	14-Apr-2025	3:51:28 PM	37	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:51:28 PM	36	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:51:28 PM	5	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:28 PM	34	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:28 PM	6	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:28 PM	30	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:28 PM	8	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:28 PM	1	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:52 PM	11	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:51:52 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:51:52 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:51:52 PM	40	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:51:54 PM	7	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:51:56 PM	10	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:56 PM	10	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:51:56 PM	65	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:52:00 PM	10	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:52:00 PM	13	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:52:00 PM	1	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:52:00 PM	12	1267.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:52:00 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:52:00 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:52:00 PM	1	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:52:00 PM	87	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:00 PM	1	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:17 PM	5	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:52:17 PM	5	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:52:17 PM	25	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:52:17 PM	2	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:52:17 PM	8	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:52:39 PM	84	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:40 PM	3	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:52:40 PM	2	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:52:40 PM	7	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:52:40 PM	13	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:52:40 PM	4	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:52:40 PM	2	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:52:40 PM	86	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:52:43 PM	85	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:43 PM	6	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:43 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:43 PM	5	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:43 PM	4	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:52:43 PM	2	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:52:43 PM	20	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:52:43 PM	10	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:53:13 PM	32	1267.50	TQEX
GENMAB A/S	14-Apr-2025	3:53:41 PM	3	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:53:49 PM	84	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	40	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	13	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	17	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	7	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	3	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	5	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:02 PM	15	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:54:13 PM	25	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:54:13 PM	82	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:54:13 PM	6	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:54:14 PM	5	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:54:14 PM	22	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:54:14 PM	32	1268.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:54:20 PM	49	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:20 PM	63	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:21 PM	23	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:21 PM	20	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:22 PM	10	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:22 PM	5	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:22 PM	40	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:22 PM	11	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:22 PM	10	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:36 PM	7	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:36 PM	2	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:36 PM	3	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:36 PM	4	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:36 PM	4	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:36 PM	60	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:36 PM	4	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:54:38 PM	4	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:54:38 PM	8	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:54:38 PM	21	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:54:38 PM	7	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:54:38 PM	5	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:54:40 PM	44	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:54:58 PM	53	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:58 PM	36	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:54:58 PM	8	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:54:58 PM	21	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:55:00 PM	1	1268.50	AQEU
GENMAB A/S	14-Apr-2025	3:55:00 PM	6	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:55:00 PM	8	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:55:00 PM	21	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:55:00 PM	1	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:55:10 PM	26	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:55:10 PM	74	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:55:11 PM	10	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:55:11 PM	60	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:55:11 PM	10	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:55:11 PM	7	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:55:36 PM	11	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:55:36 PM	12	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:55:36 PM	11	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:55:36 PM	32	1268.00	XCSE
GENMAB A/S	14-Apr-2025	3:55:39 PM	32	1268.00	CEUX
GENMAB A/S	14-Apr-2025	3:55:42 PM	3	1267.50	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:56:09 PM	7	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	1	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	20	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	53	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	7	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	13	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:09 PM	17	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:56:09 PM	13	1267.00	TQEX
GENMAB A/S	14-Apr-2025	3:56:09 PM	25	1267.50	AQEU
GENMAB A/S	14-Apr-2025	3:56:09 PM	3	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:09 PM	10	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:09 PM	15	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:09 PM	9	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:09 PM	4	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:10 PM	89	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:31 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:31 PM	21	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:31 PM	11	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:31 PM	10	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:31 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:31 PM	83	1267.00	XCSE
GENMAB A/S	14-Apr-2025	3:56:31 PM	18	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:56:31 PM	8	1267.50	TQEX
GENMAB A/S	14-Apr-2025	3:56:31 PM	20	1267.50	TQEX
GENMAB A/S	14-Apr-2025	3:56:37 PM	13	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:37 PM	21	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:37 PM	1	1267.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:40 PM	20	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:40 PM	10	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:40 PM	10	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:40 PM	10	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:41 PM	85	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:56:41 PM	37	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:53 PM	25	1266.50	TQEX
GENMAB A/S	14-Apr-2025	3:56:53 PM	1	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:53 PM	14	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:56:53 PM	11	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:57:09 PM	89	1266.00	XCSE
GENMAB A/S	14-Apr-2025	3:57:09 PM	8	1266.00	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:57:09 PM	5	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:57:09 PM	12	1266.00	AQEU
GENMAB A/S	14-Apr-2025	3:57:09 PM	14	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:57:09 PM	39	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:57:09 PM	3	1266.00	CEUX
GENMAB A/S	14-Apr-2025	3:57:27 PM	16	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:57:27 PM	20	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:57:27 PM	10	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:57:27 PM	28	1266.50	XCSE
GENMAB A/S	14-Apr-2025	3:57:50 PM	2	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:57:50 PM	6	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:57:50 PM	25	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:57:50 PM	2	1267.50	XCSE
GENMAB A/S	14-Apr-2025	3:58:03 PM	4	1268.00	AQEU
GENMAB A/S	14-Apr-2025	3:58:03 PM	10	1268.00	AQEU
GENMAB A/S	14-Apr-2025	3:58:11 PM	45	1268.50	XCSE
GENMAB A/S	14-Apr-2025	3:58:11 PM	34	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:58:44 PM	27	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:58:44 PM	36	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:58:49 PM	2	1269.50	CEUX
GENMAB A/S	14-Apr-2025	3:58:57 PM	84	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:58:57 PM	83	1269.50	CEUX
GENMAB A/S	14-Apr-2025	3:59:09 PM	2	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:09 PM	3	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:09 PM	32	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:59:12 PM	40	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:12 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:12 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:12 PM	11	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:12 PM	5	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:12 PM	5	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:12 PM	50	1268.50	CEUX
GENMAB A/S	14-Apr-2025	3:59:13 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:13 PM	40	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:13 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:13 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:13 PM	40	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:13 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:13 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:13 PM	29	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:20 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:20 PM	11	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:20 PM	40	1269.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	3:59:20 PM	4	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:30 PM	40	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:30 PM	5	1269.00	XCSE
GENMAB A/S	14-Apr-2025	3:59:43 PM	7	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:59:47 PM	14	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:47 PM	5	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:47 PM	8	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:59 PM	64	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:59:59 PM	20	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:59:59 PM	3	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:59:59 PM	13	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:59:59 PM	9	1269.50	XCSE
GENMAB A/S	14-Apr-2025	3:59:59 PM	2	1269.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:59 PM	3	1268.50	TQEX
GENMAB A/S	14-Apr-2025	3:59:59 PM	2	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:59:59 PM	9	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:59:59 PM	4	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:59:59 PM	4	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:59:59 PM	2	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:59:59 PM	4	1269.00	AQEU
GENMAB A/S	14-Apr-2025	3:59:59 PM	11	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:59:59 PM	31	1269.00	CEUX
GENMAB A/S	14-Apr-2025	3:59:59 PM	43	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:08 PM	32	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:00:08 PM	82	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:10 PM	26	1270.00	AQEU
GENMAB A/S	14-Apr-2025	4:00:22 PM	66	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:23 PM	82	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:23 PM	9	1269.50	TQEX
GENMAB A/S	14-Apr-2025	4:00:23 PM	10	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:23 PM	9	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:28 PM	31	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:28 PM	50	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:28 PM	2	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:28 PM	2	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:28 PM	2	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:43 PM	89	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:46 PM	36	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:00:46 PM	45	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	4	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	40	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	3	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	13	1267.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:00:59 PM	7	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	3	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	7	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	5	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	3	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	13	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:00:59 PM	9	1268.50	TQEX
GENMAB A/S	14-Apr-2025	4:00:59 PM	1	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:59 PM	50	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:00:59 PM	36	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:01:08 PM	84	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:01:09 PM	22	1267.00	TQEX
GENMAB A/S	14-Apr-2025	4:01:11 PM	2	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:01:11 PM	11	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:01:11 PM	5	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:01:11 PM	49	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:01:37 PM	25	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:01:37 PM	13	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:01:37 PM	13	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:01:37 PM	11	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:01:37 PM	8	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:01:37 PM	4	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:01:37 PM	16	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:01:37 PM	7	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:01:37 PM	13	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:01:48 PM	1	1268.00	XCSE
GENMAB A/S	14-Apr-2025	4:01:48 PM	85	1268.00	XCSE
GENMAB A/S	14-Apr-2025	4:01:48 PM	8	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:01:48 PM	5	1267.50	TQEX
GENMAB A/S	14-Apr-2025	4:01:48 PM	15	1267.50	TQEX
GENMAB A/S	14-Apr-2025	4:01:48 PM	10	1267.50	TQEX
GENMAB A/S	14-Apr-2025	4:01:48 PM	4	1267.50	TQEX
GENMAB A/S	14-Apr-2025	4:01:48 PM	45	1268.00	AQEU
GENMAB A/S	14-Apr-2025	4:01:48 PM	33	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:01:58 PM	13	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:01:58 PM	52	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:01:59 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:01:59 PM	3	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:02:31 PM	80	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:02:32 PM	8	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:02:49 PM	4	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:02:51 PM	35	1268.00	XCSE
GENMAB A/S	14-Apr-2025	4:02:51 PM	83	1268.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:03:05 PM	1	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:03:05 PM	87	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:05 PM	84	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:05 PM	89	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:03:05 PM	85	1263.50	XCSE
GENMAB A/S	14-Apr-2025	4:03:05 PM	82	1262.50	XCSE
GENMAB A/S	14-Apr-2025	4:03:05 PM	83	1261.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:05 PM	16	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:03:05 PM	88	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:03:05 PM	84	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:03:05 PM	26	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:03:05 PM	26	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:03:05 PM	48	1263.50	CEUX
GENMAB A/S	14-Apr-2025	4:03:06 PM	20	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:03:06 PM	10	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:03:06 PM	5	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:03:09 PM	46	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:03:20 PM	4	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:20 PM	4	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:20 PM	18	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:29 PM	2	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:29 PM	2	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:03:49 PM	26	1266.00	TQEX
GENMAB A/S	14-Apr-2025	4:04:32 PM	2	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	65	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:05:07 PM	22	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:05:07 PM	40	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:05:07 PM	4	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:05:07 PM	8	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:05:07 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:05:07 PM	2	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	3	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	2	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	5	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	2	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	8	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	2	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:05:07 PM	25	1265.00	AQEU
GENMAB A/S	14-Apr-2025	4:05:07 PM	37	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:05:09 PM	22	1265.50	TQEX
GENMAB A/S	14-Apr-2025	4:05:39 PM	85	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:07:14 PM	100	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:07:14 PM	36	1268.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:07:15 PM	67	1268.00	XCSE
GENMAB A/S	14-Apr-2025	4:07:33 PM	17	1268.00	XCSE
GENMAB A/S	14-Apr-2025	4:07:33 PM	10	1268.00	XCSE
GENMAB A/S	14-Apr-2025	4:07:33 PM	27	1268.00	XCSE
GENMAB A/S	14-Apr-2025	4:07:33 PM	31	1268.00	AQEU
GENMAB A/S	14-Apr-2025	4:07:33 PM	54	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:07:33 PM	35	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:07:33 PM	20	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:07:59 PM	82	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:03 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:03 PM	13	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:03 PM	11	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:03 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:03 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:03 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:03 PM	40	1267.00	TQEX
GENMAB A/S	14-Apr-2025	4:08:03 PM	3	1267.00	TQEX
GENMAB A/S	14-Apr-2025	4:08:03 PM	5	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:08:03 PM	84	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:08:04 PM	11	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	11	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	11	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	11	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	21	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	17	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	59	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:04 PM	112	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:18 PM	36	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:08:18 PM	88	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:18 PM	1	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:08:18 PM	20	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:08:18 PM	36	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:09:09 PM	83	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:09:13 PM	25	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:09:13 PM	60	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:09:24 PM	5	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:09:24 PM	6	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:09:24 PM	5	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:09:24 PM	61	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:09:24 PM	19	1267.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:09:26 PM	40	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:09:26 PM	13	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:09:26 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:09:26 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:10:19 PM	23	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:10:19 PM	86	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:10:19 PM	36	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:10:20 PM	40	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:10:20 PM	13	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:10:20 PM	26	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:10:20 PM	4	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:10:21 PM	49	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:10:23 PM	100	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:10:33 PM	86	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:10:33 PM	5	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:10:33 PM	28	1266.00	AQEU
GENMAB A/S	14-Apr-2025	4:10:33 PM	28	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:10:38 PM	88	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:11:19 PM	36	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:11:19 PM	36	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:11:19 PM	79	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:11:19 PM	9	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:11:48 PM	100	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:11:48 PM	6	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:11:49 PM	100	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:11:56 PM	78	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:16 PM	31	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:16 PM	23	1266.00	TQEX
GENMAB A/S	14-Apr-2025	4:12:16 PM	3	1266.00	TQEX
GENMAB A/S	14-Apr-2025	4:12:16 PM	20	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:12:22 PM	51	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:23 PM	6	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:12:23 PM	6	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:12:23 PM	6	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:12:47 PM	89	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	35	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	40	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	25	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	11	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	1	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	12	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	11	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	40	1266.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:12:47 PM	11	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:12:47 PM	27	1266.00	TQEX
GENMAB A/S	14-Apr-2025	4:12:47 PM	22	1266.00	TQEX
GENMAB A/S	14-Apr-2025	4:12:47 PM	27	1266.00	AQEU
GENMAB A/S	14-Apr-2025	4:12:47 PM	36	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:12:47 PM	45	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:12:50 PM	39	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:12:56 PM	4	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:12:56 PM	82	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:13:11 PM	36	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:13:12 PM	13	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:13:17 PM	32	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:13:25 PM	48	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:13:25 PM	64	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:13:37 PM	2	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:13:37 PM	23	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:14:12 PM	23	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:14:12 PM	64	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:14:12 PM	40	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:14:12 PM	5	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:14:12 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:14:12 PM	39	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:14:12 PM	88	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:14:14 PM	68	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:14:29 PM	82	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:14:29 PM	24	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:14:29 PM	8	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:14:29 PM	25	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:14:29 PM	32	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:14:54 PM	56	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:14:56 PM	4	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:14:56 PM	23	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:14:56 PM	10	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:14:56 PM	70	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:14:56 PM	5	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:15:04 PM	65	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:15:04 PM	23	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:15:17 PM	30	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:15:18 PM	58	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:15:18 PM	62	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:15:32 PM	31	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:15:32 PM	57	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:15:32 PM	29	1265.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:15:32 PM	25	1266.00	AQEU
GENMAB A/S	14-Apr-2025	4:15:44 PM	10	1265.00	AQEU
GENMAB A/S	14-Apr-2025	4:15:44 PM	89	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:15:49 PM	58	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:15:51 PM	6	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:16:03 PM	31	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:16:03 PM	51	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:16:03 PM	43	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:16:12 PM	4	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:16:22 PM	21	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:16:22 PM	6	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:16:23 PM	30	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:16:29 PM	40	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:16:29 PM	12	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:16:29 PM	10	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:16:29 PM	20	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:16:29 PM	11	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:16:29 PM	28	1265.00	AQEU
GENMAB A/S	14-Apr-2025	4:16:34 PM	89	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:16:34 PM	8	1264.00	TQEX
GENMAB A/S	14-Apr-2025	4:16:34 PM	25	1264.00	TQEX
GENMAB A/S	14-Apr-2025	4:16:34 PM	17	1264.00	AQEU
GENMAB A/S	14-Apr-2025	4:16:34 PM	88	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:16:51 PM	84	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:17:14 PM	29	1264.00	AQEU
GENMAB A/S	14-Apr-2025	4:17:14 PM	39	1263.50	CEUX
GENMAB A/S	14-Apr-2025	4:17:20 PM	12	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:17:20 PM	12	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:17:20 PM	13	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:17:20 PM	20	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:17:20 PM	30	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:17:23 PM	83	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:17:23 PM	2	1263.50	CEUX
GENMAB A/S	14-Apr-2025	4:17:23 PM	3	1263.50	CEUX
GENMAB A/S	14-Apr-2025	4:18:04 PM	43	1263.50	CEUX
GENMAB A/S	14-Apr-2025	4:18:14 PM	89	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:18:27 PM	40	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:18:27 PM	25	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:18:54 PM	35	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:18:54 PM	23	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:18:54 PM	40	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:18:54 PM	12	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:18:54 PM	26	1264.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:18:54 PM	20	1264.00	TQEX
GENMAB A/S	14-Apr-2025	4:18:54 PM	33	1264.50	AQEU
GENMAB A/S	14-Apr-2025	4:18:59 PM	20	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:18:59 PM	5	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:18:59 PM	9	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:18:59 PM	3	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:18:59 PM	24	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:19:00 PM	41	1263.50	XCSE
GENMAB A/S	14-Apr-2025	4:19:24 PM	83	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:19:44 PM	87	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:20:08 PM	32	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:20:27 PM	12	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:20:53 PM	86	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:20:53 PM	52	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:20:53 PM	34	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:21:06 PM	29	1264.50	AQEU
GENMAB A/S	14-Apr-2025	4:21:10 PM	7	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:10 PM	33	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:10 PM	11	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:10 PM	13	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:10 PM	10	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:10 PM	13	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:10 PM	32	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:21:14 PM	35	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:14 PM	28	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:14 PM	40	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:14 PM	9	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:14 PM	39	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:21:14 PM	50	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:21:14 PM	34	1264.00	TQEX
GENMAB A/S	14-Apr-2025	4:21:14 PM	5	1264.00	TQEX
GENMAB A/S	14-Apr-2025	4:21:14 PM	87	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:21:34 PM	63	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:21:42 PM	85	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:47 PM	83	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:21:54 PM	86	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:22:04 PM	55	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:22:35 PM	25	1264.50	AQEU
GENMAB A/S	14-Apr-2025	4:22:43 PM	31	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:22:43 PM	32	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:22:50 PM	14	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:22:50 PM	12	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:22:50 PM	10	1264.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:22:50 PM	40	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:22:50 PM	25	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:22:50 PM	25	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:22:50 PM	43	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:22:51 PM	37	1263.50	TQEX
GENMAB A/S	14-Apr-2025	4:23:24 PM	48	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:23:24 PM	40	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:23:24 PM	18	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:23:24 PM	1	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:23:24 PM	27	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:23:34 PM	64	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:23:34 PM	66	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:23:34 PM	21	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:23:44 PM	22	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:23:59 PM	59	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:24:02 PM	2	1263.50	AQEU
GENMAB A/S	14-Apr-2025	4:24:03 PM	2	1263.50	AQEU
GENMAB A/S	14-Apr-2025	4:24:03 PM	2	1263.50	AQEU
GENMAB A/S	14-Apr-2025	4:24:04 PM	26	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:24:04 PM	19	1263.50	AQEU
GENMAB A/S	14-Apr-2025	4:24:04 PM	30	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:24:04 PM	54	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:24:34 PM	89	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:24:34 PM	39	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:24:34 PM	45	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:25:04 PM	72	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:25:04 PM	38	1263.50	AQEU
GENMAB A/S	14-Apr-2025	4:25:24 PM	89	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:25:27 PM	15	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:25:39 PM	17	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:25:54 PM	71	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:26:31 PM	60	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:26:31 PM	27	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:26:38 PM	86	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:26:38 PM	2	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:26:54 PM	86	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:26:54 PM	25	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:26:56 PM	1	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:27:08 PM	13	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:08 PM	40	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:08 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:08 PM	13	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:08 PM	13	1267.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:27:08 PM	85	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:27:08 PM	36	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:08 PM	5	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:08 PM	5	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:08 PM	6	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:08 PM	3	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:08 PM	20	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:09 PM	49	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:19 PM	32	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:24 PM	82	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:25 PM	38	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:27:25 PM	32	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:27:37 PM	90	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:39 PM	30	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:27:39 PM	25	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:27:54 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:54 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:27:54 PM	2	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:28:24 PM	25	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:28:27 PM	49	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:28:27 PM	14	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:28:34 PM	12	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:28:48 PM	82	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:28:49 PM	36	1267.50	CEUX
GENMAB A/S	14-Apr-2025	4:28:53 PM	100	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:28:53 PM	12	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:28:53 PM	32	1267.50	CEUX
GENMAB A/S	14-Apr-2025	4:29:07 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:29:07 PM	39	1267.50	TQEX
GENMAB A/S	14-Apr-2025	4:29:07 PM	25	1267.50	AQEU
GENMAB A/S	14-Apr-2025	4:29:09 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:29:09 PM	11	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:29:09 PM	40	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:29:09 PM	85	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:29:09 PM	32	1267.50	CEUX
GENMAB A/S	14-Apr-2025	4:29:09 PM	48	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:29:09 PM	37	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:29:34 PM	85	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:29:54 PM	74	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:30:05 PM	36	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:30:24 PM	85	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:30:27 PM	19	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:30:28 PM	12	1266.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:30:30 PM	3	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:30:35 PM	70	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:30:42 PM	61	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:30:43 PM	16	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:30:43 PM	86	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:30:43 PM	9	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:30:43 PM	23	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:30:43 PM	27	1266.00	AQEU
GENMAB A/S	14-Apr-2025	4:30:43 PM	87	1266.00	CEUX
GENMAB A/S	14-Apr-2025	4:30:43 PM	84	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:30:50 PM	34	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:30:50 PM	23	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:30:50 PM	11	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:31:04 PM	18	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:31:04 PM	31	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:31:04 PM	9	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:31:14 PM	13	1264.00	XCSE
GENMAB A/S	14-Apr-2025	4:31:47 PM	63	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:32:13 PM	35	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:32:13 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:32:13 PM	30	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:32:13 PM	81	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:32:21 PM	47	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:32:21 PM	2	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:32:21 PM	6	1265.00	XCSE
GENMAB A/S	14-Apr-2025	4:32:27 PM	36	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:32:27 PM	5	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:32:27 PM	5	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:32:27 PM	5	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:32:34 PM	25	1264.50	TQEX
GENMAB A/S	14-Apr-2025	4:32:34 PM	63	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:32:35 PM	3	1264.50	AQEU
GENMAB A/S	14-Apr-2025	4:32:46 PM	71	1263.50	XCSE
GENMAB A/S	14-Apr-2025	4:32:51 PM	3	1264.50	AQEU
GENMAB A/S	14-Apr-2025	4:33:04 PM	20	1264.50	AQEU
GENMAB A/S	14-Apr-2025	4:33:05 PM	13	1264.50	AQEU
GENMAB A/S	14-Apr-2025	4:33:08 PM	15	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:33:12 PM	50	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:41 PM	10	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:41 PM	25	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:41 PM	51	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:41 PM	10	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:41 PM	6	1264.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:33:41 PM	10	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:41 PM	36	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:41 PM	5	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:41 PM	5	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:41 PM	6	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:41 PM	3	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:41 PM	20	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:41 PM	5	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:41 PM	18	1264.50	CEUX
GENMAB A/S	14-Apr-2025	4:33:50 PM	69	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:50 PM	8	1264.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:50 PM	81	1263.50	XCSE
GENMAB A/S	14-Apr-2025	4:33:53 PM	9	1264.00	AQEU
GENMAB A/S	14-Apr-2025	4:33:53 PM	33	1264.00	AQEU
GENMAB A/S	14-Apr-2025	4:33:58 PM	32	1264.00	CEUX
GENMAB A/S	14-Apr-2025	4:34:02 PM	1	1263.50	XCSE
GENMAB A/S	14-Apr-2025	4:34:02 PM	34	1263.50	TQEX
GENMAB A/S	14-Apr-2025	4:34:02 PM	39	1263.50	CEUX
GENMAB A/S	14-Apr-2025	4:34:26 PM	27	1262.50	XCSE
GENMAB A/S	14-Apr-2025	4:34:26 PM	5	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:34:26 PM	6	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:34:26 PM	6	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:34:26 PM	8	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:34:30 PM	35	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:34:30 PM	10	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:34:30 PM	36	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:34:40 PM	32	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:34:40 PM	28	1262.50	CEUX
GENMAB A/S	14-Apr-2025	4:34:40 PM	8	1262.50	CEUX
GENMAB A/S	14-Apr-2025	4:34:52 PM	66	1262.50	XCSE
GENMAB A/S	14-Apr-2025	4:35:05 PM	31	1263.00	XCSE
GENMAB A/S	14-Apr-2025	4:35:07 PM	14	1263.00	CEUX
GENMAB A/S	14-Apr-2025	4:35:52 PM	11	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:35:52 PM	51	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:35:52 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:35:52 PM	12	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:35:52 PM	25	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:35:54 PM	18	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:35:59 PM	36	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:36:00 PM	36	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:36:01 PM	35	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:01 PM	29	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:01 PM	35	1265.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:36:01 PM	12	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:01 PM	13	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:36:24 PM	88	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:24 PM	87	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:36:40 PM	28	1265.50	AQEU
GENMAB A/S	14-Apr-2025	4:36:44 PM	5	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:36:44 PM	36	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:36:44 PM	21	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:36:50 PM	10	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:50 PM	11	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:50 PM	51	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:50 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:50 PM	12	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:36:50 PM	10	1265.00	TQEX
GENMAB A/S	14-Apr-2025	4:36:50 PM	20	1265.00	CEUX
GENMAB A/S	14-Apr-2025	4:37:04 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:04 PM	51	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:04 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:04 PM	15	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:04 PM	32	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:37:05 PM	35	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:05 PM	31	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:05 PM	31	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:34 PM	82	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:35 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:35 PM	13	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:35 PM	11	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:35 PM	15	1265.50	XCSE
GENMAB A/S	14-Apr-2025	4:37:35 PM	40	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:37:37 PM	42	1265.50	CEUX
GENMAB A/S	14-Apr-2025	4:38:03 PM	4	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:38:04 PM	28	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:04 PM	82	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:38:28 PM	30	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:38:40 PM	83	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:40 PM	4	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	2	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	2	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	2	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	3	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	3	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	5	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	5	1266.50	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:38:40 PM	5	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	5	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:38:40 PM	36	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:38:40 PM	3	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:38:40 PM	4	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:38:40 PM	37	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:38:41 PM	47	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:46 PM	33	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:46 PM	51	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:47 PM	47	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:47 PM	36	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:38:47 PM	6	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:38:52 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:52 PM	32	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:52 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:52 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:52 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:38:52 PM	14	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:39:00 PM	18	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:39:00 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:39:00 PM	11	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:39:00 PM	12	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:39:00 PM	35	1267.00	XCSE
GENMAB A/S	14-Apr-2025	4:39:00 PM	55	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:39:08 PM	37	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:39:08 PM	55	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:39:14 PM	88	1266.00	XCSE
GENMAB A/S	14-Apr-2025	4:39:31 PM	25	1267.00	AQEU
GENMAB A/S	14-Apr-2025	4:39:40 PM	49	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:39:40 PM	35	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:39:40 PM	5	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:39:40 PM	61	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:39:40 PM	25	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:39:47 PM	13	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:40:05 PM	37	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:40:13 PM	82	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:40:15 PM	4	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:40:15 PM	38	1266.50	TQEX
GENMAB A/S	14-Apr-2025	4:40:15 PM	48	1266.50	AQEU
GENMAB A/S	14-Apr-2025	4:40:30 PM	32	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:40:30 PM	10	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:40:30 PM	11	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:40:30 PM	12	1266.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:40:30 PM	47	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:40:31 PM	6	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:40:31 PM	5	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:40:31 PM	6	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:40:31 PM	11	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:40:41 PM	36	1266.50	CEUX
GENMAB A/S	14-Apr-2025	4:40:54 PM	78	1266.50	XCSE
GENMAB A/S	14-Apr-2025	4:40:54 PM	32	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:40:54 PM	33	1267.00	CEUX
GENMAB A/S	14-Apr-2025	4:41:31 PM	70	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:41:31 PM	13	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:41:31 PM	86	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:41:31 PM	85	1267.50	XCSE
GENMAB A/S	14-Apr-2025	4:41:31 PM	86	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:41:38 PM	5	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:41:56 PM	11	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:41:56 PM	13	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:41:56 PM	51	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:41:58 PM	13	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:14 PM	11	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:14 PM	12	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:15 PM	26	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:15 PM	36	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:15 PM	5	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:15 PM	5	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:15 PM	6	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:42:15 PM	5	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:42:15 PM	14	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:42:16 PM	6	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:16 PM	5	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:17 PM	4	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:17 PM	6	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:19 PM	39	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:42:20 PM	48	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:25 PM	11	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:25 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:25 PM	51	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:25 PM	11	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:29 PM	31	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:29 PM	39	1268.50	AQEU
GENMAB A/S	14-Apr-2025	4:42:40 PM	37	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:45 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:45 PM	12	1269.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:42:45 PM	11	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:45 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:45 PM	2	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:42:45 PM	29	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:45 PM	4	1268.50	TQEX
GENMAB A/S	14-Apr-2025	4:42:45 PM	9	1268.50	TQEX
GENMAB A/S	14-Apr-2025	4:42:45 PM	4	1268.50	TQEX
GENMAB A/S	14-Apr-2025	4:42:45 PM	7	1268.50	TQEX
GENMAB A/S	14-Apr-2025	4:42:54 PM	17	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:57 PM	13	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:57 PM	11	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:57 PM	13	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:42:57 PM	26	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:43:00 PM	25	1269.50	TQEX
GENMAB A/S	14-Apr-2025	4:43:00 PM	8	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:43:02 PM	31	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:43:14 PM	63	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:43:14 PM	75	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:43:14 PM	3	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:43:14 PM	36	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:43:14 PM	11	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:43:14 PM	36	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:43:16 PM	42	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:43:18 PM	14	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:43:48 PM	69	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:44:04 PM	15	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:44:21 PM	89	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:44:21 PM	32	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:44:22 PM	17	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:44:22 PM	26	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:44:26 PM	7	1269.00	TQEX
GENMAB A/S	14-Apr-2025	4:44:26 PM	65	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:44:27 PM	14	1269.00	TQEX
GENMAB A/S	14-Apr-2025	4:44:42 PM	2	1269.00	TQEX
GENMAB A/S	14-Apr-2025	4:44:44 PM	3	1269.00	TQEX
GENMAB A/S	14-Apr-2025	4:45:03 PM	29	1268.00	CEUX
GENMAB A/S	14-Apr-2025	4:45:03 PM	15	1268.50	AQEU
GENMAB A/S	14-Apr-2025	4:45:11 PM	51	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:11 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:11 PM	21	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:11 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:11 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:11 PM	5	1269.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:45:11 PM	10	1268.50	AQEU
GENMAB A/S	14-Apr-2025	4:45:12 PM	49	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	30	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	33	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	18	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	13	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	30	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	51	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	12	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:12 PM	5	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:28 PM	66	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:43 PM	10	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:45:43 PM	33	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:45:54 PM	73	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:46:03 PM	31	1270.00	TQEX
GENMAB A/S	14-Apr-2025	4:46:03 PM	3	1270.00	TQEX
GENMAB A/S	14-Apr-2025	4:46:14 PM	16	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:46:23 PM	89	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:46:23 PM	21	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:46:34 PM	85	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:46:35 PM	7	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:46:42 PM	27	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:46:51 PM	35	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:46:54 PM	61	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:46:54 PM	50	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:46:54 PM	21	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:46:57 PM	22	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:46:58 PM	59	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:01 PM	6	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:14 PM	86	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:19 PM	12	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:19 PM	10	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:19 PM	10	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:19 PM	21	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:19 PM	35	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:19 PM	24	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:19 PM	19	1270.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:47:19 PM	19	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:47:19 PM	1	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:47:20 PM	35	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:20 PM	31	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:20 PM	11	1270.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:20 PM	35	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:47:20 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:20 PM	1	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:20 PM	26	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:20 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:21 PM	36	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:21 PM	5	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:21 PM	5	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:22 PM	6	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:22 PM	5	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:22 PM	5	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:22 PM	9	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:22 PM	32	1270.50	CEUX
GENMAB A/S	14-Apr-2025	4:47:24 PM	5	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:47:24 PM	46	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:47:24 PM	12	1270.00	TQEX
GENMAB A/S	14-Apr-2025	4:47:24 PM	14	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:47:24 PM	34	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:47:25 PM	15	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:47:25 PM	1	1270.00	CEUX
GENMAB A/S	14-Apr-2025	4:47:27 PM	53	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:54 PM	72	1269.50	XCSE
GENMAB A/S	14-Apr-2025	4:47:54 PM	10	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:47:54 PM	13	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:47:54 PM	64	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:47:54 PM	23	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:47:54 PM	6	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:47:55 PM	2	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:47:59 PM	4	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:48:04 PM	3	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:48:09 PM	3	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:48:14 PM	3	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:48:17 PM	5	1269.50	AQEU
GENMAB A/S	14-Apr-2025	4:48:18 PM	82	1268.50	XCSE
GENMAB A/S	14-Apr-2025	4:48:18 PM	2	1269.00	TQEX
GENMAB A/S	14-Apr-2025	4:48:18 PM	3	1269.50	CEUX
GENMAB A/S	14-Apr-2025	4:48:18 PM	1	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:48:19 PM	20	1269.00	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:48:19 PM	2	1269.00	TQEX
GENMAB A/S	14-Apr-2025	4:48:24 PM	1	1269.00	TQEX
GENMAB A/S	14-Apr-2025	4:48:29 PM	10	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:48:34 PM	79	1269.00	XCSE
GENMAB A/S	14-Apr-2025	4:48:41 PM	2	1269.00	CEUX
GENMAB A/S	14-Apr-2025	4:49:00 PM	88	1270.00	XCSE
GENMAB A/S	14-Apr-2025	4:49:06 PM	64	1271.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:06 PM	13	1271.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:06 PM	36	1271.50	CEUX
GENMAB A/S	14-Apr-2025	4:49:06 PM	2	1271.50	CEUX
GENMAB A/S	14-Apr-2025	4:49:06 PM	29	1271.50	CEUX
GENMAB A/S	14-Apr-2025	4:49:07 PM	100	1271.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:14 PM	25	1271.00	TQEX
GENMAB A/S	14-Apr-2025	4:49:14 PM	43	1271.00	CEUX
GENMAB A/S	14-Apr-2025	4:49:14 PM	1	1271.00	CEUX
GENMAB A/S	14-Apr-2025	4:49:14 PM	40	1271.00	CEUX
GENMAB A/S	14-Apr-2025	4:49:38 PM	53	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:48 PM	34	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:49:48 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:49:49 PM	66	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	15	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	2	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	13	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	11	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	64	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	7	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	48	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:49:49 PM	25	1273.00	TQEX
GENMAB A/S	14-Apr-2025	4:49:49 PM	44	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:49:49 PM	36	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:49:49 PM	26	1273.50	AQEU
GENMAB A/S	14-Apr-2025	4:50:00 PM	13	1273.50	TQEX
GENMAB A/S	14-Apr-2025	4:50:04 PM	16	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:04 PM	14	1273.50	TQEX
GENMAB A/S	14-Apr-2025	4:50:12 PM	35	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:12 PM	33	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:12 PM	44	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:12 PM	47	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:50:12 PM	4	1272.50	TQEX
GENMAB A/S	14-Apr-2025	4:50:12 PM	2	1272.50	TQEX
GENMAB A/S	14-Apr-2025	4:50:12 PM	4	1272.50	TQEX
GENMAB A/S	14-Apr-2025	4:50:12 PM	2	1272.50	TQEX
GENMAB A/S	14-Apr-2025	4:50:12 PM	4	1272.50	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:50:12 PM	10	1272.50	TQEX
GENMAB A/S	14-Apr-2025	4:50:12 PM	7	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	36	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	8	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	4	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	15	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	40	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	2	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	13	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	7	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	9	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:12 PM	35	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:50:31 PM	51	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:50:31 PM	10	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:31 PM	13	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:31 PM	11	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:31 PM	32	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:31 PM	6	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:31 PM	6	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:31 PM	5	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:34 PM	6	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:34 PM	6	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:34 PM	5	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:50:48 PM	3	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:50:48 PM	64	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:50:48 PM	13	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:50:48 PM	8	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:50:48 PM	47	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:50:48 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:48 PM	20	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:50 PM	9	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:50:53 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:53 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:50:53 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:14 PM	61	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:51:33 PM	55	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:39 PM	42	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:51:39 PM	40	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:51:39 PM	36	1274.00	CEUX
GENMAB A/S	14-Apr-2025	4:51:39 PM	5	1274.00	CEUX
GENMAB A/S	14-Apr-2025	4:51:39 PM	6	1274.00	CEUX
GENMAB A/S	14-Apr-2025	4:51:39 PM	6	1274.00	CEUX
GENMAB A/S	14-Apr-2025	4:51:40 PM	20	1273.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:51:46 PM	36	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	36	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	36	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:46 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:47 PM	32	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:51:47 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:47 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:47 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:47 PM	36	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:47 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:47 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:47 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:51:52 PM	57	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:51:52 PM	57	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:00 PM	25	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:00 PM	13	1273.00	AQEU
GENMAB A/S	14-Apr-2025	4:52:10 PM	85	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:52:11 PM	12	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:11 PM	10	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:11 PM	13	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:11 PM	64	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:11 PM	11	1273.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:12 PM	41	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:52:13 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:13 PM	6	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:13 PM	5	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:13 PM	20	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:24 PM	27	1271.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:24 PM	39	1272.50	TQEX
GENMAB A/S	14-Apr-2025	4:52:24 PM	10	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:24 PM	30	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:24 PM	2	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:52:24 PM	2	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:52:24 PM	2	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:52:25 PM	15	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:52:25 PM	2	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:52:25 PM	3	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:52:25 PM	2	1272.50	AQEU

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:52:25 PM	7	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:52:27 PM	13	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:31 PM	15	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:52:34 PM	9	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:52:34 PM	6	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:52:34 PM	6	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:52:34 PM	23	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:34 PM	8	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:52:35 PM	14	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:53:02 PM	64	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:53:02 PM	11	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:53:02 PM	11	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:53:02 PM	11	1272.50	XCSE
GENMAB A/S	14-Apr-2025	4:53:02 PM	36	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:53:02 PM	6	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:53:02 PM	6	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:53:02 PM	6	1272.50	CEUX
GENMAB A/S	14-Apr-2025	4:53:02 PM	1	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:53:02 PM	20	1272.50	AQEU
GENMAB A/S	14-Apr-2025	4:53:04 PM	20	1273.00	CEUX
GENMAB A/S	14-Apr-2025	4:53:14 PM	82	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:53:30 PM	22	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:04 PM	83	1274.50	TQEX
GENMAB A/S	14-Apr-2025	4:54:04 PM	29	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:07 PM	69	1274.00	XCSE
GENMAB A/S	14-Apr-2025	4:54:07 PM	15	1274.00	XCSE
GENMAB A/S	14-Apr-2025	4:54:07 PM	36	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:07 PM	56	1274.50	AQEU
GENMAB A/S	14-Apr-2025	4:54:08 PM	64	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:08 PM	11	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:08 PM	13	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:08 PM	64	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:08 PM	13	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:08 PM	11	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:08 PM	36	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:08 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:08 PM	5	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:08 PM	6	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:08 PM	20	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:09 PM	1	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:09 PM	11	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:09 PM	31	1274.50	XCSE
GENMAB A/S	14-Apr-2025	4:54:09 PM	64	1274.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	14-Apr-2025	4:54:18 PM	49	1274.00	XCSE
GENMAB A/S	14-Apr-2025	4:54:18 PM	40	1274.00	XCSE
GENMAB A/S	14-Apr-2025	4:54:18 PM	36	1274.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:30 PM	80	1274.00	XCSE
GENMAB A/S	14-Apr-2025	4:54:30 PM	9	1274.00	XCSE
GENMAB A/S	14-Apr-2025	4:54:32 PM	30	1273.50	CEUX
GENMAB A/S	14-Apr-2025	4:54:42 PM	88	1273.00	XCSE
GENMAB A/S	14-Apr-2025	4:54:48 PM	1	1274.00	XCSE
GENMAB A/S	15-Apr-2025	9:41:56 AM	89	1292.00	CEUX
GENMAB A/S	15-Apr-2025	9:42:03 AM	80	1291.50	XCSE
GENMAB A/S	15-Apr-2025	9:42:03 AM	72	1291.50	TQEX
GENMAB A/S	15-Apr-2025	9:42:29 AM	60	1291.50	XCSE
GENMAB A/S	15-Apr-2025	9:42:29 AM	53	1291.50	TQEX
GENMAB A/S	15-Apr-2025	9:42:29 AM	78	1291.00	CEUX
GENMAB A/S	15-Apr-2025	9:42:29 AM	83	1291.00	AQEU
GENMAB A/S	15-Apr-2025	9:42:30 AM	77	1290.50	XCSE
GENMAB A/S	15-Apr-2025	9:45:16 AM	5	1290.50	XCSE
GENMAB A/S	15-Apr-2025	9:45:16 AM	27	1290.50	XCSE
GENMAB A/S	15-Apr-2025	9:45:30 AM	27	1291.00	XCSE
GENMAB A/S	15-Apr-2025	9:46:20 AM	25	1292.50	XCSE
GENMAB A/S	15-Apr-2025	9:46:20 AM	10	1292.00	AQEU
GENMAB A/S	15-Apr-2025	9:46:30 AM	16	1292.00	AQEU
GENMAB A/S	15-Apr-2025	9:47:20 AM	21	1293.50	AQEU
GENMAB A/S	15-Apr-2025	9:47:30 AM	43	1294.00	TQEX
GENMAB A/S	15-Apr-2025	9:47:48 AM	62	1294.00	XCSE
GENMAB A/S	15-Apr-2025	9:50:14 AM	62	1294.00	XCSE
GENMAB A/S	15-Apr-2025	9:50:14 AM	40	1293.00	XCSE
GENMAB A/S	15-Apr-2025	9:50:14 AM	43	1293.00	TQEX
GENMAB A/S	15-Apr-2025	9:50:14 AM	34	1292.00	TQEX
GENMAB A/S	15-Apr-2025	9:50:14 AM	84	1294.00	CEUX
GENMAB A/S	15-Apr-2025	9:50:14 AM	85	1293.00	CEUX
GENMAB A/S	15-Apr-2025	9:50:14 AM	8	1292.00	CEUX
GENMAB A/S	15-Apr-2025	9:50:14 AM	66	1292.00	CEUX
GENMAB A/S	15-Apr-2025	9:50:14 AM	23	1293.50	AQEU
GENMAB A/S	15-Apr-2025	9:50:14 AM	44	1292.50	AQEU
GENMAB A/S	15-Apr-2025	9:50:20 AM	6	1292.00	TQEX
GENMAB A/S	15-Apr-2025	9:50:20 AM	19	1292.00	CEUX
GENMAB A/S	15-Apr-2025	9:50:21 AM	22	1292.00	AQEU
GENMAB A/S	15-Apr-2025	9:50:22 AM	38	1292.00	CEUX
GENMAB A/S	15-Apr-2025	9:51:08 AM	28	1292.00	CEUX
GENMAB A/S	15-Apr-2025	9:53:07 AM	30	1291.50	XCSE
GENMAB A/S	15-Apr-2025	9:53:07 AM	4	1291.50	XCSE
GENMAB A/S	15-Apr-2025	9:53:39 AM	22	1290.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	9:54:11 AM	22	1290.50	CEUX
GENMAB A/S	15-Apr-2025	9:55:10 AM	22	1290.50	CEUX
GENMAB A/S	15-Apr-2025	9:56:53 AM	24	1291.00	AQEU
GENMAB A/S	15-Apr-2025	9:56:53 AM	3	1291.00	AQEU
GENMAB A/S	15-Apr-2025	9:57:09 AM	39	1290.50	XCSE
GENMAB A/S	15-Apr-2025	9:57:09 AM	36	1291.00	TQEX
GENMAB A/S	15-Apr-2025	9:57:09 AM	24	1290.50	CEUX
GENMAB A/S	15-Apr-2025	9:57:09 AM	30	1291.00	AQEU
GENMAB A/S	15-Apr-2025	9:57:26 AM	87	1290.00	XCSE
GENMAB A/S	15-Apr-2025	9:59:40 AM	25	1292.00	CEUX
GENMAB A/S	15-Apr-2025	9:59:51 AM	89	1292.50	XCSE
GENMAB A/S	15-Apr-2025	9:59:51 AM	29	1292.50	XCSE
GENMAB A/S	15-Apr-2025	9:59:51 AM	13	1292.50	XCSE
GENMAB A/S	15-Apr-2025	9:59:51 AM	16	1292.50	XCSE
GENMAB A/S	15-Apr-2025	9:59:51 AM	30	1292.50	TQEX
GENMAB A/S	15-Apr-2025	9:59:51 AM	13	1292.50	TQEX
GENMAB A/S	15-Apr-2025	9:59:51 AM	7	1292.50	CEUX
GENMAB A/S	15-Apr-2025	9:59:51 AM	8	1292.50	CEUX
GENMAB A/S	15-Apr-2025	9:59:51 AM	1	1292.50	AQEU
GENMAB A/S	15-Apr-2025	9:59:51 AM	1	1292.50	AQEU
GENMAB A/S	15-Apr-2025	9:59:52 AM	7	1292.50	CEUX
GENMAB A/S	15-Apr-2025	9:59:57 AM	15	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:00 AM	15	1292.50	CEUX
GENMAB A/S	15-Apr-2025	10:00:00 AM	8	1292.50	AQEU
GENMAB A/S	15-Apr-2025	10:00:09 AM	45	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:09 AM	40	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:09 AM	47	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:09 AM	25	1293.00	TQEX
GENMAB A/S	15-Apr-2025	10:00:09 AM	89	1293.00	CEUX
GENMAB A/S	15-Apr-2025	10:00:13 AM	24	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:13 AM	15	1292.50	AQEU
GENMAB A/S	15-Apr-2025	10:00:15 AM	66	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:00:16 AM	90	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:16 AM	35	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:16 AM	38	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:16 AM	19	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:16 AM	22	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:16 AM	33	1291.50	TQEX
GENMAB A/S	15-Apr-2025	10:00:17 AM	84	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:18 AM	15	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:18 AM	57	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:18 AM	47	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:00:26 AM	38	1291.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	10:00:26 AM	35	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:26 AM	16	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:26 AM	16	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:26 AM	57	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:26 AM	34	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:00:26 AM	68	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:00:26 AM	23	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:00:26 AM	27	1291.00	AQEU
GENMAB A/S	15-Apr-2025	10:01:21 AM	84	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:01:28 AM	24	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:02:45 AM	25	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:02:52 AM	51	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:03:09 AM	26	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	38	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	13	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	15	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	22	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	16	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	17	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	26	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:09 AM	14	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:03:59 AM	91	1294.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:59 AM	32	1294.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:59 AM	13	1294.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:59 AM	39	1294.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:59 AM	30	1294.50	XCSE
GENMAB A/S	15-Apr-2025	10:03:59 AM	88	1294.00	CEUX
GENMAB A/S	15-Apr-2025	10:03:59 AM	35	1294.50	AQEU
GENMAB A/S	15-Apr-2025	10:04:12 AM	86	1293.50	XCSE
GENMAB A/S	15-Apr-2025	10:04:12 AM	26	1293.50	AQEU
GENMAB A/S	15-Apr-2025	10:04:36 AM	90	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:04:36 AM	89	1293.00	CEUX
GENMAB A/S	15-Apr-2025	10:04:36 AM	15	1292.50	AQEU
GENMAB A/S	15-Apr-2025	10:04:36 AM	10	1292.50	AQEU
GENMAB A/S	15-Apr-2025	10:04:45 AM	25	1292.00	TQEX
GENMAB A/S	15-Apr-2025	10:04:45 AM	89	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:04:47 AM	86	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:05:22 AM	15	1290.50	CEUX
GENMAB A/S	15-Apr-2025	10:06:03 AM	3	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:06:41 AM	50	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:06:41 AM	31	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:06:41 AM	78	1291.50	CEUX
GENMAB A/S	15-Apr-2025	10:07:21 AM	37	1290.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	10:07:21 AM	61	1290.50	CEUX
GENMAB A/S	15-Apr-2025	10:07:21 AM	13	1290.50	CEUX
GENMAB A/S	15-Apr-2025	10:07:40 AM	37	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:07:40 AM	9	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:09:21 AM	87	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:10:05 AM	39	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:10:05 AM	27	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:10:05 AM	20	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:10:05 AM	28	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:10:05 AM	25	1291.00	TQEX
GENMAB A/S	15-Apr-2025	10:10:07 AM	52	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:10:07 AM	25	1291.00	AQEU
GENMAB A/S	15-Apr-2025	10:11:07 AM	22	1291.50	CEUX
GENMAB A/S	15-Apr-2025	10:11:21 AM	90	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:11:21 AM	63	1291.50	CEUX
GENMAB A/S	15-Apr-2025	10:11:26 AM	58	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:11:28 AM	44	1290.50	CEUX
GENMAB A/S	15-Apr-2025	10:11:46 AM	48	1290.00	XCSE
GENMAB A/S	15-Apr-2025	10:11:46 AM	25	1290.00	TQEX
GENMAB A/S	15-Apr-2025	10:11:46 AM	37	1290.00	AQEU
GENMAB A/S	15-Apr-2025	10:11:47 AM	80	1289.50	CEUX
GENMAB A/S	15-Apr-2025	10:12:03 AM	16	1289.50	XCSE
GENMAB A/S	15-Apr-2025	10:12:03 AM	19	1289.50	XCSE
GENMAB A/S	15-Apr-2025	10:12:03 AM	30	1289.50	XCSE
GENMAB A/S	15-Apr-2025	10:12:12 AM	16	1290.00	XCSE
GENMAB A/S	15-Apr-2025	10:12:12 AM	15	1290.00	TQEX
GENMAB A/S	15-Apr-2025	10:13:20 AM	13	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:13:20 AM	24	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:13:20 AM	15	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:13:50 AM	31	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:14:11 AM	25	1292.50	AQEU
GENMAB A/S	15-Apr-2025	10:14:50 AM	67	1293.50	XCSE
GENMAB A/S	15-Apr-2025	10:14:50 AM	24	1293.50	XCSE
GENMAB A/S	15-Apr-2025	10:15:10 AM	84	1293.00	XCSE
GENMAB A/S	15-Apr-2025	10:15:10 AM	26	1293.00	TQEX
GENMAB A/S	15-Apr-2025	10:15:10 AM	23	1293.00	CEUX
GENMAB A/S	15-Apr-2025	10:15:10 AM	61	1293.00	CEUX
GENMAB A/S	15-Apr-2025	10:15:10 AM	28	1292.50	AQEU
GENMAB A/S	15-Apr-2025	10:15:31 AM	58	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:15:31 AM	25	1292.00	TQEX
GENMAB A/S	15-Apr-2025	10:15:31 AM	85	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:15:32 AM	91	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:15:32 AM	89	1291.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	10:15:32 AM	79	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:15:46 AM	89	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:17:51 AM	21	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:18:31 AM	82	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:18:31 AM	3	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:18:31 AM	15	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:18:31 AM	28	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:18:50 AM	11	1292.00	TQEX
GENMAB A/S	15-Apr-2025	10:18:50 AM	20	1292.00	TQEX
GENMAB A/S	15-Apr-2025	10:18:50 AM	89	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:18:50 AM	28	1292.00	AQEU
GENMAB A/S	15-Apr-2025	10:19:00 AM	90	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:20:43 AM	16	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:20:43 AM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:21:11 AM	84	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:21:11 AM	29	1291.50	TQEX
GENMAB A/S	15-Apr-2025	10:21:11 AM	7	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:21:11 AM	6	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:21:11 AM	18	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:21:11 AM	8	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:21:11 AM	28	1291.50	AQEU
GENMAB A/S	15-Apr-2025	10:22:25 AM	89	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:24:12 AM	15	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:24:12 AM	15	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:24:12 AM	34	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:24:12 AM	50	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:24:17 AM	13	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:24:17 AM	39	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:24:17 AM	31	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:25:01 AM	57	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:25:01 AM	20	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:25:01 AM	86	1292.00	XCSE
GENMAB A/S	15-Apr-2025	10:25:01 AM	87	1292.00	CEUX
GENMAB A/S	15-Apr-2025	10:25:01 AM	26	1292.00	AQEU
GENMAB A/S	15-Apr-2025	10:27:31 AM	54	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:27:31 AM	89	1291.00	CEUX
GENMAB A/S	15-Apr-2025	10:27:31 AM	25	1291.00	AQEU
GENMAB A/S	15-Apr-2025	10:28:21 AM	31	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:29:20 AM	59	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:29:20 AM	14	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:29:20 AM	15	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:01 AM	32	1289.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:01 AM	89	1290.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	10:30:01 AM	32	1290.50	CEUX
GENMAB A/S	15-Apr-2025	10:30:06 AM	2	1291.00	TQEX
GENMAB A/S	15-Apr-2025	10:30:06 AM	6	1291.00	TQEX
GENMAB A/S	15-Apr-2025	10:30:06 AM	2	1291.00	TQEX
GENMAB A/S	15-Apr-2025	10:30:06 AM	10	1291.00	TQEX
GENMAB A/S	15-Apr-2025	10:30:06 AM	88	1291.50	CEUX
GENMAB A/S	15-Apr-2025	10:30:07 AM	49	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:07 AM	16	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:07 AM	46	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:45 AM	50	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:45 AM	5	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:45 AM	23	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:45 AM	15	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:45 AM	21	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:30:45 AM	10	1291.00	TQEX
GENMAB A/S	15-Apr-2025	10:30:45 AM	25	1291.00	AQEU
GENMAB A/S	15-Apr-2025	10:31:03 AM	49	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:31:03 AM	11	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:31:53 AM	16	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:32:45 AM	31	1291.00	TQEX
GENMAB A/S	15-Apr-2025	10:32:45 AM	8	1291.00	AQEU
GENMAB A/S	15-Apr-2025	10:32:49 AM	90	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:32:49 AM	13	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:32:49 AM	13	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:32:49 AM	39	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:32:49 AM	34	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:32:49 AM	15	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:32:49 AM	85	1290.50	CEUX
GENMAB A/S	15-Apr-2025	10:33:29 AM	6	1290.00	TQEX
GENMAB A/S	15-Apr-2025	10:33:29 AM	19	1290.00	TQEX
GENMAB A/S	15-Apr-2025	10:34:24 AM	88	1290.00	XCSE
GENMAB A/S	15-Apr-2025	10:34:51 AM	55	1289.50	XCSE
GENMAB A/S	15-Apr-2025	10:36:29 AM	32	1290.00	CEUX
GENMAB A/S	15-Apr-2025	10:36:30 AM	45	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:36:30 AM	8	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:36:30 AM	32	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:37:05 AM	42	1290.50	XCSE
GENMAB A/S	15-Apr-2025	10:37:05 AM	8	1290.50	CEUX
GENMAB A/S	15-Apr-2025	10:39:00 AM	28	1291.50	TQEX
GENMAB A/S	15-Apr-2025	10:39:52 AM	13	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:39:52 AM	9	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:39:52 AM	15	1291.50	XCSE
GENMAB A/S	15-Apr-2025	10:39:52 AM	15	1291.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	10:39:52 AM	65	1291.00	XCSE
GENMAB A/S	15-Apr-2025	10:39:52 AM	36	1291.50	CEUX
GENMAB A/S	15-Apr-2025	10:39:52 AM	1	1291.50	CEUX
GENMAB A/S	15-Apr-2025	10:39:52 AM	25	1291.50	CEUX
GENMAB A/S	15-Apr-2025	10:41:31 AM	22	1294.50	XCSE
GENMAB A/S	15-Apr-2025	10:41:32 AM	28	1295.00	XCSE
GENMAB A/S	15-Apr-2025	10:41:32 AM	40	1295.00	XCSE
GENMAB A/S	15-Apr-2025	10:41:46 AM	28	1295.50	TQEX
GENMAB A/S	15-Apr-2025	10:42:04 AM	12	1295.00	XCSE
GENMAB A/S	15-Apr-2025	10:42:06 AM	79	1295.00	XCSE
GENMAB A/S	15-Apr-2025	10:42:06 AM	39	1295.00	AQEU
GENMAB A/S	15-Apr-2025	10:42:12 AM	30	1294.50	TQEX
GENMAB A/S	15-Apr-2025	10:42:12 AM	22	1294.50	CEUX
GENMAB A/S	15-Apr-2025	10:42:12 AM	66	1294.50	CEUX
GENMAB A/S	15-Apr-2025	10:42:12 AM	20	1294.50	CEUX
GENMAB A/S	15-Apr-2025	10:42:13 AM	35	1295.00	XCSE
GENMAB A/S	15-Apr-2025	10:42:13 AM	16	1295.00	XCSE
GENMAB A/S	15-Apr-2025	10:43:49 AM	21	1296.00	CEUX
GENMAB A/S	15-Apr-2025	10:43:55 AM	16	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:45:05 AM	45	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:45:05 AM	25	1297.00	TQEX
GENMAB A/S	15-Apr-2025	10:45:05 AM	90	1297.00	CEUX
GENMAB A/S	15-Apr-2025	10:45:05 AM	9	1297.00	CEUX
GENMAB A/S	15-Apr-2025	10:45:05 AM	24	1297.00	CEUX
GENMAB A/S	15-Apr-2025	10:45:07 AM	4	1297.00	CEUX
GENMAB A/S	15-Apr-2025	10:45:08 AM	86	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	56	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	39	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	14	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	5	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	8	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	13	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	44	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:45:08 AM	32	1296.50	CEUX
GENMAB A/S	15-Apr-2025	10:45:08 AM	22	1296.50	AQEU
GENMAB A/S	15-Apr-2025	10:45:08 AM	13	1296.50	AQEU
GENMAB A/S	15-Apr-2025	10:45:43 AM	18	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:46:43 AM	24	1296.50	AQEU
GENMAB A/S	15-Apr-2025	10:47:31 AM	88	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:48:14 AM	50	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:48:14 AM	36	1296.50	CEUX
GENMAB A/S	15-Apr-2025	10:48:18 AM	36	1296.50	CEUX
GENMAB A/S	15-Apr-2025	10:48:23 AM	54	1296.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	10:48:23 AM	35	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:48:23 AM	15	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:48:23 AM	10	1296.50	XCSE
GENMAB A/S	15-Apr-2025	10:48:23 AM	10	1295.50	TQEX
GENMAB A/S	15-Apr-2025	10:48:23 AM	36	1296.50	CEUX
GENMAB A/S	15-Apr-2025	10:48:23 AM	68	1296.00	CEUX
GENMAB A/S	15-Apr-2025	10:48:23 AM	1	1296.00	CEUX
GENMAB A/S	15-Apr-2025	10:48:23 AM	23	1295.50	AQEU
GENMAB A/S	15-Apr-2025	10:48:29 AM	88	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:48:48 AM	87	1294.00	XCSE
GENMAB A/S	15-Apr-2025	10:48:48 AM	85	1293.50	XCSE
GENMAB A/S	15-Apr-2025	10:48:48 AM	90	1294.50	CEUX
GENMAB A/S	15-Apr-2025	10:48:48 AM	15	1294.50	CEUX
GENMAB A/S	15-Apr-2025	10:48:48 AM	76	1294.50	CEUX
GENMAB A/S	15-Apr-2025	10:48:48 AM	85	1293.50	CEUX
GENMAB A/S	15-Apr-2025	10:49:28 AM	89	1292.50	XCSE
GENMAB A/S	15-Apr-2025	10:49:28 AM	87	1292.50	CEUX
GENMAB A/S	15-Apr-2025	10:51:03 AM	86	1293.50	XCSE
GENMAB A/S	15-Apr-2025	10:51:03 AM	35	1293.50	TQEX
GENMAB A/S	15-Apr-2025	10:51:03 AM	79	1293.50	CEUX
GENMAB A/S	15-Apr-2025	10:51:03 AM	35	1294.00	AQEU
GENMAB A/S	15-Apr-2025	10:53:27 AM	72	1294.50	CEUX
GENMAB A/S	15-Apr-2025	10:54:33 AM	43	1294.50	XCSE
GENMAB A/S	15-Apr-2025	10:57:19 AM	29	1295.00	TQEX
GENMAB A/S	15-Apr-2025	10:57:51 AM	64	1294.00	XCSE
GENMAB A/S	15-Apr-2025	10:58:00 AM	30	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:58:00 AM	14	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:58:00 AM	14	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:58:00 AM	34	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:58:00 AM	15	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:58:01 AM	15	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:58:01 AM	15	1295.50	XCSE
GENMAB A/S	15-Apr-2025	10:59:47 AM	7	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:59:47 AM	14	1297.00	XCSE
GENMAB A/S	15-Apr-2025	10:59:47 AM	93	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:00:00 AM	35	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:00:00 AM	14	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:00:00 AM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:00:00 AM	50	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:00:53 AM	30	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:00:53 AM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:02:01 AM	42	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:02:01 AM	69	1297.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	11:02:01 AM	25	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:02:01 AM	24	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:02:01 AM	42	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:02:01 AM	27	1297.00	TQEX
GENMAB A/S	15-Apr-2025	11:02:06 AM	32	1296.50	AQEU
GENMAB A/S	15-Apr-2025	11:02:06 AM	3	1296.50	AQEU
GENMAB A/S	15-Apr-2025	11:02:06 AM	87	1296.50	CEUX
GENMAB A/S	15-Apr-2025	11:02:36 AM	71	1296.00	XCSE
GENMAB A/S	15-Apr-2025	11:02:36 AM	18	1296.00	XCSE
GENMAB A/S	15-Apr-2025	11:02:36 AM	26	1296.00	TQEX
GENMAB A/S	15-Apr-2025	11:05:11 AM	84	1296.00	XCSE
GENMAB A/S	15-Apr-2025	11:06:05 AM	13	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:06:05 AM	42	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:06:05 AM	4	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:06:05 AM	36	1297.00	CEUX
GENMAB A/S	15-Apr-2025	11:06:15 AM	90	1297.00	XCSE
GENMAB A/S	15-Apr-2025	11:06:15 AM	90	1297.50	XCSE
GENMAB A/S	15-Apr-2025	11:06:15 AM	85	1298.00	CEUX
GENMAB A/S	15-Apr-2025	11:07:13 AM	25	1298.00	CEUX
GENMAB A/S	15-Apr-2025	11:09:04 AM	62	1298.00	XCSE
GENMAB A/S	15-Apr-2025	11:09:23 AM	28	1298.50	XCSE
GENMAB A/S	15-Apr-2025	11:10:39 AM	91	1299.50	XCSE
GENMAB A/S	15-Apr-2025	11:10:39 AM	14	1299.50	XCSE
GENMAB A/S	15-Apr-2025	11:13:10 AM	89	1299.50	XCSE
GENMAB A/S	15-Apr-2025	11:13:10 AM	34	1299.50	TQEX
GENMAB A/S	15-Apr-2025	11:13:10 AM	88	1299.50	CEUX
GENMAB A/S	15-Apr-2025	11:13:30 AM	72	1299.50	XCSE
GENMAB A/S	15-Apr-2025	11:13:30 AM	22	1299.00	AQEU
GENMAB A/S	15-Apr-2025	11:14:25 AM	91	1302.00	XCSE
GENMAB A/S	15-Apr-2025	11:14:25 AM	30	1302.00	CEUX
GENMAB A/S	15-Apr-2025	11:14:25 AM	54	1301.50	CEUX
GENMAB A/S	15-Apr-2025	11:14:26 AM	45	1302.00	XCSE
GENMAB A/S	15-Apr-2025	11:15:00 AM	25	1302.50	TQEX
GENMAB A/S	15-Apr-2025	11:15:00 AM	89	1302.50	CEUX
GENMAB A/S	15-Apr-2025	11:15:00 AM	15	1302.50	CEUX
GENMAB A/S	15-Apr-2025	11:15:02 AM	57	1302.50	XCSE
GENMAB A/S	15-Apr-2025	11:15:07 AM	23	1302.50	AQEU
GENMAB A/S	15-Apr-2025	11:15:07 AM	20	1302.50	CEUX
GENMAB A/S	15-Apr-2025	11:15:33 AM	25	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:15:33 AM	77	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:16:06 AM	84	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:16:06 AM	34	1302.50	TQEX
GENMAB A/S	15-Apr-2025	11:16:06 AM	21	1303.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	11:16:06 AM	69	1303.00	CEUX
GENMAB A/S	15-Apr-2025	11:17:04 AM	21	1302.50	AQEU
GENMAB A/S	15-Apr-2025	11:17:28 AM	8	1302.50	AQEU
GENMAB A/S	15-Apr-2025	11:18:52 AM	42	1303.00	CEUX
GENMAB A/S	15-Apr-2025	11:19:00 AM	44	1303.00	CEUX
GENMAB A/S	15-Apr-2025	11:19:03 AM	6	1302.50	AQEU
GENMAB A/S	15-Apr-2025	11:19:40 AM	85	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:19:40 AM	88	1303.00	CEUX
GENMAB A/S	15-Apr-2025	11:20:31 AM	29	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:20:31 AM	31	1303.00	TQEX
GENMAB A/S	15-Apr-2025	11:20:51 AM	60	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:20:51 AM	26	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:21:01 AM	58	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:21:01 AM	15	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:21:01 AM	24	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:21:01 AM	18	1303.00	CEUX
GENMAB A/S	15-Apr-2025	11:21:01 AM	7	1303.00	CEUX
GENMAB A/S	15-Apr-2025	11:21:09 AM	22	1302.50	AQEU
GENMAB A/S	15-Apr-2025	11:21:27 AM	84	1302.00	XCSE
GENMAB A/S	15-Apr-2025	11:21:27 AM	7	1302.50	AQEU
GENMAB A/S	15-Apr-2025	11:21:27 AM	10	1302.00	CEUX
GENMAB A/S	15-Apr-2025	11:21:33 AM	25	1302.00	CEUX
GENMAB A/S	15-Apr-2025	11:21:33 AM	12	1302.00	CEUX
GENMAB A/S	15-Apr-2025	11:21:33 AM	3	1302.00	CEUX
GENMAB A/S	15-Apr-2025	11:21:35 AM	26	1301.50	AQEU
GENMAB A/S	15-Apr-2025	11:21:49 AM	33	1301.00	XCSE
GENMAB A/S	15-Apr-2025	11:21:49 AM	22	1301.50	AQEU
GENMAB A/S	15-Apr-2025	11:21:49 AM	28	1301.50	TQEX
GENMAB A/S	15-Apr-2025	11:21:49 AM	1	1301.50	CEUX
GENMAB A/S	15-Apr-2025	11:21:49 AM	33	1301.50	CEUX
GENMAB A/S	15-Apr-2025	11:22:04 AM	58	1301.00	XCSE
GENMAB A/S	15-Apr-2025	11:24:51 AM	54	1301.50	XCSE
GENMAB A/S	15-Apr-2025	11:24:51 AM	16	1301.50	XCSE
GENMAB A/S	15-Apr-2025	11:24:51 AM	8	1301.00	CEUX
GENMAB A/S	15-Apr-2025	11:24:52 AM	46	1301.50	XCSE
GENMAB A/S	15-Apr-2025	11:26:26 AM	5	1302.50	CEUX
GENMAB A/S	15-Apr-2025	11:26:42 AM	46	1303.00	XCSE
GENMAB A/S	15-Apr-2025	11:30:11 AM	68	1304.00	XCSE
GENMAB A/S	15-Apr-2025	11:30:11 AM	20	1304.00	XCSE
GENMAB A/S	15-Apr-2025	11:30:11 AM	25	1304.00	TQEX
GENMAB A/S	15-Apr-2025	11:31:18 AM	13	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:31:18 AM	52	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:31:18 AM	49	1306.00	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	11:31:18 AM	8	1305.50	AQEU
GENMAB A/S	15-Apr-2025	11:31:18 AM	87	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:31:18 AM	36	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:31:18 AM	7	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:31:18 AM	8	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:31:18 AM	1	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:31:18 AM	25	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:33:04 AM	25	1306.50	TQEX
GENMAB A/S	15-Apr-2025	11:33:11 AM	84	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:34:01 AM	77	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:34:01 AM	9	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:34:01 AM	48	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:34:01 AM	66	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:34:01 AM	98	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:34:01 AM	15	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:34:13 AM	47	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:34:13 AM	26	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:36:02 AM	91	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:36:04 AM	88	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:36:04 AM	25	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:36:04 AM	36	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:36:04 AM	25	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:36:04 AM	6	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:36:08 AM	13	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:36:15 AM	36	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:36:51 AM	84	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:37:00 AM	1	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:37:04 AM	21	1305.50	AQEU
GENMAB A/S	15-Apr-2025	11:37:05 AM	16	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:37:05 AM	30	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:37:05 AM	14	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:37:05 AM	36	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:37:21 AM	10	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:37:21 AM	25	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:38:06 AM	29	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:38:12 AM	1	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:38:23 AM	14	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:39:00 AM	52	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:40:00 AM	23	1306.50	AQEU
GENMAB A/S	15-Apr-2025	11:40:00 AM	36	1307.00	CEUX
GENMAB A/S	15-Apr-2025	11:40:00 AM	36	1307.00	CEUX
GENMAB A/S	15-Apr-2025	11:40:00 AM	8	1307.00	CEUX
GENMAB A/S	15-Apr-2025	11:40:01 AM	32	1307.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	11:40:37 AM	32	1307.00	CEUX
GENMAB A/S	15-Apr-2025	11:40:41 AM	24	1306.50	AQEU
GENMAB A/S	15-Apr-2025	11:41:04 AM	47	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:41:04 AM	30	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:41:04 AM	25	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:41:04 AM	12	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:41:04 AM	6	1306.50	AQEU
GENMAB A/S	15-Apr-2025	11:41:04 AM	88	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:41:05 AM	47	1306.50	XCSE
GENMAB A/S	15-Apr-2025	11:41:08 AM	89	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:42:06 AM	26	1305.50	TQEX
GENMAB A/S	15-Apr-2025	11:42:06 AM	12	1305.50	AQEU
GENMAB A/S	15-Apr-2025	11:42:06 AM	21	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:42:06 AM	65	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:42:41 AM	75	1305.00	XCSE
GENMAB A/S	15-Apr-2025	11:42:52 AM	10	1305.00	XCSE
GENMAB A/S	15-Apr-2025	11:44:23 AM	31	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:45:35 AM	58	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:45:35 AM	49	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:46:21 AM	86	1305.00	XCSE
GENMAB A/S	15-Apr-2025	11:47:32 AM	31	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:47:32 AM	21	1305.50	AQEU
GENMAB A/S	15-Apr-2025	11:48:34 AM	60	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:48:34 AM	24	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:51:22 AM	89	1305.00	XCSE
GENMAB A/S	15-Apr-2025	11:51:22 AM	72	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:51:22 AM	13	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:51:22 AM	16	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:51:22 AM	13	1305.50	XCSE
GENMAB A/S	15-Apr-2025	11:51:22 AM	33	1305.50	TQEX
GENMAB A/S	15-Apr-2025	11:51:22 AM	18	1305.50	AQEU
GENMAB A/S	15-Apr-2025	11:51:22 AM	36	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:51:22 AM	60	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:51:22 AM	36	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:51:22 AM	10	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:51:22 AM	26	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:51:22 AM	8	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:52:25 AM	88	1306.00	CEUX
GENMAB A/S	15-Apr-2025	11:54:07 AM	35	1306.50	TQEX
GENMAB A/S	15-Apr-2025	11:54:07 AM	22	1306.50	AQEU
GENMAB A/S	15-Apr-2025	11:54:07 AM	36	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:54:07 AM	23	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:54:30 AM	1	1306.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	11:55:38 AM	86	1307.00	XCSE
GENMAB A/S	15-Apr-2025	11:55:38 AM	35	1307.00	XCSE
GENMAB A/S	15-Apr-2025	11:55:38 AM	14	1307.00	XCSE
GENMAB A/S	15-Apr-2025	11:55:38 AM	35	1307.00	XCSE
GENMAB A/S	15-Apr-2025	11:55:38 AM	24	1307.00	XCSE
GENMAB A/S	15-Apr-2025	11:56:11 AM	86	1307.00	XCSE
GENMAB A/S	15-Apr-2025	11:57:10 AM	89	1307.50	XCSE
GENMAB A/S	15-Apr-2025	11:57:10 AM	36	1307.50	CEUX
GENMAB A/S	15-Apr-2025	11:57:33 AM	67	1307.50	XCSE
GENMAB A/S	15-Apr-2025	11:58:29 AM	36	1307.50	CEUX
GENMAB A/S	15-Apr-2025	11:58:30 AM	32	1307.50	CEUX
GENMAB A/S	15-Apr-2025	11:58:33 AM	56	1307.50	XCSE
GENMAB A/S	15-Apr-2025	11:59:00 AM	38	1307.00	TQEX
GENMAB A/S	15-Apr-2025	11:59:03 AM	23	1306.50	AQEU
GENMAB A/S	15-Apr-2025	11:59:03 AM	4	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:59:03 AM	24	1306.50	CEUX
GENMAB A/S	15-Apr-2025	11:59:16 AM	82	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:59:17 AM	4	1306.00	XCSE
GENMAB A/S	15-Apr-2025	11:59:32 AM	90	1305.00	XCSE
GENMAB A/S	15-Apr-2025	11:59:32 AM	32	1305.50	TQEX
GENMAB A/S	15-Apr-2025	11:59:32 AM	44	1305.50	AQEU
GENMAB A/S	15-Apr-2025	11:59:32 AM	87	1305.50	CEUX
GENMAB A/S	15-Apr-2025	11:59:33 AM	5	1304.50	AQEU
GENMAB A/S	15-Apr-2025	11:59:49 AM	37	1304.50	AQEU
GENMAB A/S	15-Apr-2025	11:59:49 AM	84	1304.50	CEUX
GENMAB A/S	15-Apr-2025	11:59:49 AM	2	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:03:19 PM	85	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:03:42 PM	38	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:03:42 PM	15	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:03:42 PM	14	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:03:42 PM	14	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:04:33 PM	15	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:04:33 PM	48	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:05:21 PM	87	1303.50	XCSE
GENMAB A/S	15-Apr-2025	12:05:21 PM	25	1304.00	AQEU
GENMAB A/S	15-Apr-2025	12:06:45 PM	84	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:06:46 PM	25	1304.00	TQEX
GENMAB A/S	15-Apr-2025	12:09:41 PM	87	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:09:41 PM	1	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:09:41 PM	25	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:10:14 PM	85	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:10:16 PM	24	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:10:16 PM	26	1304.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	12:10:16 PM	88	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:10:16 PM	25	1304.00	AQEU
GENMAB A/S	15-Apr-2025	12:10:16 PM	36	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:10:16 PM	3	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:10:17 PM	27	1304.00	TQEX
GENMAB A/S	15-Apr-2025	12:10:17 PM	32	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:12:47 PM	36	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:12:47 PM	11	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:13:22 PM	45	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:13:22 PM	15	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:13:22 PM	34	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:13:23 PM	16	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:13:23 PM	14	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:13:23 PM	39	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:13:23 PM	34	1304.50	XCSE
GENMAB A/S	15-Apr-2025	12:14:00 PM	86	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:14:00 PM	36	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:14:00 PM	3	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:14:00 PM	22	1303.50	CEUX
GENMAB A/S	15-Apr-2025	12:14:01 PM	66	1303.50	CEUX
GENMAB A/S	15-Apr-2025	12:15:21 PM	90	1302.50	XCSE
GENMAB A/S	15-Apr-2025	12:15:21 PM	32	1302.50	TQEX
GENMAB A/S	15-Apr-2025	12:15:21 PM	31	1303.00	AQEU
GENMAB A/S	15-Apr-2025	12:15:33 PM	25	1302.50	CEUX
GENMAB A/S	15-Apr-2025	12:15:33 PM	4	1302.50	CEUX
GENMAB A/S	15-Apr-2025	12:15:59 PM	84	1302.00	CEUX
GENMAB A/S	15-Apr-2025	12:17:42 PM	78	1302.50	CEUX
GENMAB A/S	15-Apr-2025	12:17:42 PM	12	1302.50	CEUX
GENMAB A/S	15-Apr-2025	12:17:51 PM	28	1302.50	XCSE
GENMAB A/S	15-Apr-2025	12:17:51 PM	14	1302.50	XCSE
GENMAB A/S	15-Apr-2025	12:19:53 PM	22	1302.00	AQEU
GENMAB A/S	15-Apr-2025	12:20:01 PM	39	1316.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:01 PM	52	1316.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:02 PM	84	1324.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:02 PM	84	1323.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:02 PM	14	1322.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:02 PM	73	1322.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:02 PM	85	1320.50	XCSE
GENMAB A/S	15-Apr-2025	12:20:02 PM	27	1325.00	TQEX
GENMAB A/S	15-Apr-2025	12:20:02 PM	28	1323.50	TQEX
GENMAB A/S	15-Apr-2025	12:20:02 PM	25	1325.00	AQEU
GENMAB A/S	15-Apr-2025	12:20:02 PM	27	1323.50	AQEU
GENMAB A/S	15-Apr-2025	12:20:02 PM	85	1324.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	12:20:02 PM	4	1323.50	CEUX
GENMAB A/S	15-Apr-2025	12:20:02 PM	83	1323.50	CEUX
GENMAB A/S	15-Apr-2025	12:20:02 PM	69	1322.50	CEUX
GENMAB A/S	15-Apr-2025	12:20:02 PM	20	1322.50	CEUX
GENMAB A/S	15-Apr-2025	12:20:02 PM	89	1321.00	CEUX
GENMAB A/S	15-Apr-2025	12:20:03 PM	85	1319.50	XCSE
GENMAB A/S	15-Apr-2025	12:20:03 PM	30	1321.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:03 PM	20	1321.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:03 PM	50	1320.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:03 PM	27	1319.50	XCSE
GENMAB A/S	15-Apr-2025	12:20:03 PM	38	1321.50	CEUX
GENMAB A/S	15-Apr-2025	12:20:03 PM	35	1320.00	CEUX
GENMAB A/S	15-Apr-2025	12:20:35 PM	26	1311.00	XCSE
GENMAB A/S	15-Apr-2025	12:20:35 PM	33	1311.00	CEUX
GENMAB A/S	15-Apr-2025	12:21:14 PM	31	1310.00	XCSE
GENMAB A/S	15-Apr-2025	12:21:14 PM	26	1309.00	XCSE
GENMAB A/S	15-Apr-2025	12:21:54 PM	29	1309.00	XCSE
GENMAB A/S	15-Apr-2025	12:21:54 PM	22	1309.50	CEUX
GENMAB A/S	15-Apr-2025	12:21:54 PM	8	1309.50	CEUX
GENMAB A/S	15-Apr-2025	12:21:54 PM	2	1309.50	CEUX
GENMAB A/S	15-Apr-2025	12:22:10 PM	28	1311.50	CEUX
GENMAB A/S	15-Apr-2025	12:22:10 PM	2	1311.50	CEUX
GENMAB A/S	15-Apr-2025	12:22:16 PM	25	1314.50	XCSE
GENMAB A/S	15-Apr-2025	12:22:42 PM	25	1316.00	XCSE
GENMAB A/S	15-Apr-2025	12:22:49 PM	25	1314.50	XCSE
GENMAB A/S	15-Apr-2025	12:23:36 PM	25	1313.00	CEUX
GENMAB A/S	15-Apr-2025	12:23:36 PM	1	1313.00	CEUX
GENMAB A/S	15-Apr-2025	12:23:49 PM	6	1313.00	XCSE
GENMAB A/S	15-Apr-2025	12:23:49 PM	1	1313.00	XCSE
GENMAB A/S	15-Apr-2025	12:23:49 PM	1	1313.00	XCSE
GENMAB A/S	15-Apr-2025	12:23:49 PM	18	1313.00	XCSE
GENMAB A/S	15-Apr-2025	12:24:04 PM	25	1316.00	CEUX
GENMAB A/S	15-Apr-2025	12:24:05 PM	32	1316.50	XCSE
GENMAB A/S	15-Apr-2025	12:24:05 PM	27	1315.50	XCSE
GENMAB A/S	15-Apr-2025	12:24:05 PM	26	1316.00	AQEU
GENMAB A/S	15-Apr-2025	12:25:03 PM	29	1314.50	XCSE
GENMAB A/S	15-Apr-2025	12:25:03 PM	32	1313.50	XCSE
GENMAB A/S	15-Apr-2025	12:25:03 PM	25	1315.00	TQEX
GENMAB A/S	15-Apr-2025	12:25:03 PM	26	1315.50	CEUX
GENMAB A/S	15-Apr-2025	12:25:26 PM	19	1312.00	CEUX
GENMAB A/S	15-Apr-2025	12:28:43 PM	50	1311.50	XCSE
GENMAB A/S	15-Apr-2025	12:28:43 PM	17	1311.50	XCSE
GENMAB A/S	15-Apr-2025	12:28:43 PM	26	1311.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	12:29:33 PM	21	1311.50	CEUX
GENMAB A/S	15-Apr-2025	12:29:37 PM	20	1311.50	CEUX
GENMAB A/S	15-Apr-2025	12:29:45 PM	25	1311.50	TQEX
GENMAB A/S	15-Apr-2025	12:30:53 PM	26	1311.50	AQEU
GENMAB A/S	15-Apr-2025	12:30:53 PM	11	1311.50	CEUX
GENMAB A/S	15-Apr-2025	12:30:53 PM	35	1311.50	CEUX
GENMAB A/S	15-Apr-2025	12:31:01 PM	82	1311.00	XCSE
GENMAB A/S	15-Apr-2025	12:31:02 PM	29	1310.00	XCSE
GENMAB A/S	15-Apr-2025	12:31:02 PM	29	1310.00	CEUX
GENMAB A/S	15-Apr-2025	12:31:45 PM	26	1309.00	XCSE
GENMAB A/S	15-Apr-2025	12:31:45 PM	30	1309.00	CEUX
GENMAB A/S	15-Apr-2025	12:31:53 PM	25	1308.00	CEUX
GENMAB A/S	15-Apr-2025	12:32:02 PM	17	1307.50	XCSE
GENMAB A/S	15-Apr-2025	12:32:02 PM	54	1307.50	XCSE
GENMAB A/S	15-Apr-2025	12:32:15 PM	4	1306.00	XCSE
GENMAB A/S	15-Apr-2025	12:32:15 PM	74	1306.00	XCSE
GENMAB A/S	15-Apr-2025	12:32:58 PM	24	1305.00	XCSE
GENMAB A/S	15-Apr-2025	12:32:59 PM	12	1305.00	XCSE
GENMAB A/S	15-Apr-2025	12:32:59 PM	25	1305.00	XCSE
GENMAB A/S	15-Apr-2025	12:33:04 PM	18	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:33:04 PM	8	1304.50	CEUX
GENMAB A/S	15-Apr-2025	12:33:17 PM	30	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:33:17 PM	15	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:35:39 PM	61	1305.00	XCSE
GENMAB A/S	15-Apr-2025	12:35:39 PM	30	1305.00	CEUX
GENMAB A/S	15-Apr-2025	12:35:39 PM	7	1305.00	CEUX
GENMAB A/S	15-Apr-2025	12:36:30 PM	17	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:36:30 PM	1	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:38:51 PM	11	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:40:09 PM	27	1303.00	XCSE
GENMAB A/S	15-Apr-2025	12:40:09 PM	25	1303.50	TQEX
GENMAB A/S	15-Apr-2025	12:40:09 PM	3	1302.50	AQEU
GENMAB A/S	15-Apr-2025	12:40:09 PM	25	1303.50	CEUX
GENMAB A/S	15-Apr-2025	12:40:09 PM	2	1302.50	CEUX
GENMAB A/S	15-Apr-2025	12:40:09 PM	23	1302.50	CEUX
GENMAB A/S	15-Apr-2025	12:40:23 PM	21	1303.50	AQEU
GENMAB A/S	15-Apr-2025	12:41:40 PM	30	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:41:40 PM	30	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:41:40 PM	3	1304.00	CEUX
GENMAB A/S	15-Apr-2025	12:41:54 PM	91	1304.00	XCSE
GENMAB A/S	15-Apr-2025	12:41:54 PM	25	1304.00	TQEX
GENMAB A/S	15-Apr-2025	12:41:54 PM	4	1303.50	AQEU
GENMAB A/S	15-Apr-2025	12:41:55 PM	38	1303.00	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	12:41:55 PM	24	1303.00	CEUX
GENMAB A/S	15-Apr-2025	12:42:28 PM	21	1302.50	AQEU
GENMAB A/S	15-Apr-2025	12:42:31 PM	87	1302.50	XCSE
GENMAB A/S	15-Apr-2025	12:42:31 PM	1	1302.50	AQEU
GENMAB A/S	15-Apr-2025	12:42:31 PM	58	1302.00	CEUX
GENMAB A/S	15-Apr-2025	12:42:31 PM	8	1302.00	CEUX
GENMAB A/S	15-Apr-2025	12:42:32 PM	31	1301.50	XCSE
GENMAB A/S	15-Apr-2025	12:42:32 PM	12	1301.50	XCSE
GENMAB A/S	15-Apr-2025	12:42:38 PM	25	1301.50	TQEX
GENMAB A/S	15-Apr-2025	12:43:46 PM	10	1300.00	XCSE
GENMAB A/S	15-Apr-2025	12:43:46 PM	21	1300.00	XCSE
GENMAB A/S	15-Apr-2025	12:43:46 PM	58	1300.00	XCSE
GENMAB A/S	15-Apr-2025	12:44:31 PM	17	1299.50	CEUX
GENMAB A/S	15-Apr-2025	12:44:41 PM	85	1299.00	XCSE
GENMAB A/S	15-Apr-2025	12:44:41 PM	8	1299.50	CEUX
GENMAB A/S	15-Apr-2025	12:44:41 PM	4	1298.50	CEUX
GENMAB A/S	15-Apr-2025	12:44:41 PM	4	1298.50	CEUX
GENMAB A/S	15-Apr-2025	12:44:41 PM	18	1298.50	CEUX
GENMAB A/S	15-Apr-2025	12:44:50 PM	15	1299.50	CEUX
GENMAB A/S	15-Apr-2025	12:44:57 PM	11	1299.50	CEUX
GENMAB A/S	15-Apr-2025	12:45:21 PM	65	1299.00	XCSE
GENMAB A/S	15-Apr-2025	12:45:22 PM	13	1298.50	CEUX
GENMAB A/S	15-Apr-2025	12:45:22 PM	13	1298.50	CEUX
GENMAB A/S	15-Apr-2025	12:46:35 PM	25	1300.00	AQEU
GENMAB A/S	15-Apr-2025	12:46:35 PM	25	1300.00	CEUX
GENMAB A/S	15-Apr-2025	12:46:55 PM	25	1300.00	CEUX
GENMAB A/S	15-Apr-2025	12:49:40 PM	16	1300.00	TQEX
GENMAB A/S	15-Apr-2025	12:49:40 PM	9	1300.00	TQEX
GENMAB A/S	15-Apr-2025	12:49:40 PM	14	1300.00	CEUX
GENMAB A/S	15-Apr-2025	12:49:40 PM	21	1300.00	CEUX
GENMAB A/S	15-Apr-2025	12:50:25 PM	81	1299.50	XCSE
GENMAB A/S	15-Apr-2025	12:50:27 PM	1	1299.00	CEUX
GENMAB A/S	15-Apr-2025	12:50:29 PM	18	1299.00	CEUX
GENMAB A/S	15-Apr-2025	12:50:29 PM	6	1299.00	CEUX
GENMAB A/S	15-Apr-2025	12:51:12 PM	40	1300.00	CEUX
GENMAB A/S	15-Apr-2025	12:51:18 PM	10	1300.00	AQEU
GENMAB A/S	15-Apr-2025	12:51:19 PM	15	1300.00	AQEU
GENMAB A/S	15-Apr-2025	12:51:20 PM	87	1300.50	XCSE
GENMAB A/S	15-Apr-2025	12:51:45 PM	35	1300.50	XCSE
GENMAB A/S	15-Apr-2025	12:51:45 PM	50	1300.50	XCSE
GENMAB A/S	15-Apr-2025	12:51:45 PM	27	1301.00	CEUX
GENMAB A/S	15-Apr-2025	12:53:07 PM	85	1300.50	XCSE
GENMAB A/S	15-Apr-2025	12:53:07 PM	25	1300.50	TQEX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	12:53:07 PM	25	1300.50	CEUX
GENMAB A/S	15-Apr-2025	12:55:22 PM	89	1299.50	XCSE
GENMAB A/S	15-Apr-2025	12:55:25 PM	10	1299.00	CEUX
GENMAB A/S	15-Apr-2025	12:55:25 PM	15	1299.00	CEUX
GENMAB A/S	15-Apr-2025	12:57:15 PM	25	1300.00	AQEU
GENMAB A/S	15-Apr-2025	12:58:01 PM	32	1299.50	XCSE
GENMAB A/S	15-Apr-2025	12:58:01 PM	57	1299.50	XCSE
GENMAB A/S	15-Apr-2025	12:58:01 PM	25	1299.50	TQEX
GENMAB A/S	15-Apr-2025	12:58:01 PM	26	1299.50	CEUX
GENMAB A/S	15-Apr-2025	12:58:01 PM	35	1299.50	CEUX
GENMAB A/S	15-Apr-2025	12:58:14 PM	86	1298.50	XCSE
GENMAB A/S	15-Apr-2025	12:58:15 PM	22	1298.00	CEUX
GENMAB A/S	15-Apr-2025	12:58:15 PM	6	1298.00	CEUX
GENMAB A/S	15-Apr-2025	12:58:38 PM	84	1298.00	XCSE
GENMAB A/S	15-Apr-2025	12:58:38 PM	39	1298.00	CEUX
GENMAB A/S	15-Apr-2025	12:58:41 PM	7	1298.00	CEUX
GENMAB A/S	15-Apr-2025	1:00:00 PM	90	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:00:00 PM	5	1298.50	AQEU
GENMAB A/S	15-Apr-2025	1:00:00 PM	18	1298.50	CEUX
GENMAB A/S	15-Apr-2025	1:00:00 PM	17	1298.50	CEUX
GENMAB A/S	15-Apr-2025	1:00:00 PM	8	1298.50	CEUX
GENMAB A/S	15-Apr-2025	1:00:02 PM	12	1298.50	AQEU
GENMAB A/S	15-Apr-2025	1:00:02 PM	8	1298.50	AQEU
GENMAB A/S	15-Apr-2025	1:01:05 PM	77	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:01:05 PM	14	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:01:05 PM	91	1298.00	XCSE
GENMAB A/S	15-Apr-2025	1:01:05 PM	25	1298.00	TQEX
GENMAB A/S	15-Apr-2025	1:01:05 PM	35	1299.50	CEUX
GENMAB A/S	15-Apr-2025	1:01:05 PM	29	1298.50	CEUX
GENMAB A/S	15-Apr-2025	1:01:06 PM	22	1298.00	XCSE
GENMAB A/S	15-Apr-2025	1:01:06 PM	29	1298.00	CEUX
GENMAB A/S	15-Apr-2025	1:01:08 PM	41	1298.00	XCSE
GENMAB A/S	15-Apr-2025	1:01:10 PM	64	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:01:10 PM	3	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:04:08 PM	10	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:04:08 PM	43	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:04:08 PM	32	1299.00	CEUX
GENMAB A/S	15-Apr-2025	1:04:15 PM	3	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:04:15 PM	17	1299.00	AQEU
GENMAB A/S	15-Apr-2025	1:04:15 PM	31	1299.00	CEUX
GENMAB A/S	15-Apr-2025	1:05:24 PM	5	1299.50	CEUX
GENMAB A/S	15-Apr-2025	1:05:27 PM	21	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:05:27 PM	37	1299.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	1:06:00 PM	45	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:06:00 PM	25	1299.50	TQEX
GENMAB A/S	15-Apr-2025	1:06:03 PM	8	1299.00	AQEU
GENMAB A/S	15-Apr-2025	1:08:51 PM	25	1298.50	TQEX
GENMAB A/S	15-Apr-2025	1:10:03 PM	90	1299.00	XCSE
GENMAB A/S	15-Apr-2025	1:10:03 PM	67	1299.00	CEUX
GENMAB A/S	15-Apr-2025	1:10:13 PM	18	1298.50	AQEU
GENMAB A/S	15-Apr-2025	1:10:13 PM	7	1298.50	AQEU
GENMAB A/S	15-Apr-2025	1:10:32 PM	45	1298.00	XCSE
GENMAB A/S	15-Apr-2025	1:10:32 PM	13	1298.00	CEUX
GENMAB A/S	15-Apr-2025	1:10:32 PM	19	1298.00	CEUX
GENMAB A/S	15-Apr-2025	1:11:06 PM	48	1298.50	CEUX
GENMAB A/S	15-Apr-2025	1:11:10 PM	2	1298.50	CEUX
GENMAB A/S	15-Apr-2025	1:11:39 PM	21	1298.00	XCSE
GENMAB A/S	15-Apr-2025	1:12:29 PM	13	1298.00	XCSE
GENMAB A/S	15-Apr-2025	1:12:29 PM	51	1298.00	XCSE
GENMAB A/S	15-Apr-2025	1:12:57 PM	43	1297.50	CEUX
GENMAB A/S	15-Apr-2025	1:13:31 PM	22	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:14:07 PM	16	1297.50	XCSE
GENMAB A/S	15-Apr-2025	1:14:07 PM	29	1297.50	XCSE
GENMAB A/S	15-Apr-2025	1:14:07 PM	16	1297.50	XCSE
GENMAB A/S	15-Apr-2025	1:14:25 PM	16	1296.50	CEUX
GENMAB A/S	15-Apr-2025	1:14:59 PM	14	1296.50	TQEX
GENMAB A/S	15-Apr-2025	1:14:59 PM	3	1296.50	AQEU
GENMAB A/S	15-Apr-2025	1:14:59 PM	9	1296.50	CEUX
GENMAB A/S	15-Apr-2025	1:15:09 PM	16	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:15:09 PM	5	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:15:09 PM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:15:10 PM	18	1296.50	AQEU
GENMAB A/S	15-Apr-2025	1:15:31 PM	11	1296.50	TQEX
GENMAB A/S	15-Apr-2025	1:15:31 PM	4	1296.50	AQEU
GENMAB A/S	15-Apr-2025	1:16:24 PM	41	1296.50	XCSE
GENMAB A/S	15-Apr-2025	1:16:24 PM	45	1296.50	XCSE
GENMAB A/S	15-Apr-2025	1:16:24 PM	62	1296.50	CEUX
GENMAB A/S	15-Apr-2025	1:16:24 PM	2	1296.50	CEUX
GENMAB A/S	15-Apr-2025	1:16:39 PM	88	1295.50	XCSE
GENMAB A/S	15-Apr-2025	1:16:42 PM	37	1295.00	CEUX
GENMAB A/S	15-Apr-2025	1:16:45 PM	25	1294.50	AQEU
GENMAB A/S	15-Apr-2025	1:16:47 PM	14	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:16:47 PM	73	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:16:47 PM	46	1294.00	CEUX
GENMAB A/S	15-Apr-2025	1:17:41 PM	66	1293.00	XCSE
GENMAB A/S	15-Apr-2025	1:18:53 PM	11	1296.50	XCSE

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	1:18:53 PM	74	1296.50	XCSE
GENMAB A/S	15-Apr-2025	1:18:53 PM	25	1296.50	TQEX
GENMAB A/S	15-Apr-2025	1:18:53 PM	18	1296.50	CEUX
GENMAB A/S	15-Apr-2025	1:18:53 PM	32	1296.50	CEUX
GENMAB A/S	15-Apr-2025	1:19:07 PM	89	1295.50	XCSE
GENMAB A/S	15-Apr-2025	1:19:07 PM	85	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:19:07 PM	47	1295.50	CEUX
GENMAB A/S	15-Apr-2025	1:19:07 PM	41	1294.00	CEUX
GENMAB A/S	15-Apr-2025	1:19:51 PM	49	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:21:52 PM	39	1295.00	CEUX
GENMAB A/S	15-Apr-2025	1:21:59 PM	19	1295.00	TQEX
GENMAB A/S	15-Apr-2025	1:21:59 PM	6	1295.00	TQEX
GENMAB A/S	15-Apr-2025	1:22:43 PM	21	1295.50	CEUX
GENMAB A/S	15-Apr-2025	1:22:43 PM	13	1295.50	CEUX
GENMAB A/S	15-Apr-2025	1:22:48 PM	14	1295.50	AQEU
GENMAB A/S	15-Apr-2025	1:23:19 PM	87	1296.00	XCSE
GENMAB A/S	15-Apr-2025	1:23:19 PM	33	1296.00	CEUX
GENMAB A/S	15-Apr-2025	1:23:21 PM	11	1295.50	AQEU
GENMAB A/S	15-Apr-2025	1:23:35 PM	68	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:23:36 PM	17	1297.00	XCSE
GENMAB A/S	15-Apr-2025	1:23:36 PM	15	1296.00	XCSE
GENMAB A/S	15-Apr-2025	1:23:36 PM	73	1296.00	XCSE
GENMAB A/S	15-Apr-2025	1:23:36 PM	31	1297.00	CEUX
GENMAB A/S	15-Apr-2025	1:23:52 PM	91	1295.00	XCSE
GENMAB A/S	15-Apr-2025	1:24:35 PM	27	1293.50	XCSE
GENMAB A/S	15-Apr-2025	1:24:35 PM	25	1292.50	XCSE
GENMAB A/S	15-Apr-2025	1:24:35 PM	25	1293.00	CEUX
GENMAB A/S	15-Apr-2025	1:25:43 PM	29	1292.50	CEUX
GENMAB A/S	15-Apr-2025	1:26:53 PM	66	1293.00	XCSE
GENMAB A/S	15-Apr-2025	1:27:45 PM	40	1293.00	XCSE
GENMAB A/S	15-Apr-2025	1:27:45 PM	25	1293.50	TQEX
GENMAB A/S	15-Apr-2025	1:27:45 PM	25	1293.50	AQEU
GENMAB A/S	15-Apr-2025	1:27:45 PM	25	1293.50	CEUX
GENMAB A/S	15-Apr-2025	1:28:07 PM	28	1292.50	CEUX
GENMAB A/S	15-Apr-2025	1:28:08 PM	26	1292.00	XCSE
GENMAB A/S	15-Apr-2025	1:28:13 PM	3	1292.00	XCSE
GENMAB A/S	15-Apr-2025	1:28:13 PM	32	1291.50	CEUX
GENMAB A/S	15-Apr-2025	1:28:37 PM	30	1291.00	XCSE
GENMAB A/S	15-Apr-2025	1:28:37 PM	28	1290.50	CEUX
GENMAB A/S	15-Apr-2025	1:28:39 PM	25	1290.50	XCSE
GENMAB A/S	15-Apr-2025	1:29:03 PM	37	1291.50	XCSE
GENMAB A/S	15-Apr-2025	1:31:02 PM	69	1292.50	XCSE
GENMAB A/S	15-Apr-2025	1:31:02 PM	36	1292.50	CEUX

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	1:31:14 PM	12	1292.50	TQEX
GENMAB A/S	15-Apr-2025	1:31:14 PM	5	1292.50	TQEX
GENMAB A/S	15-Apr-2025	1:33:00 PM	84	1293.50	XCSE
GENMAB A/S	15-Apr-2025	1:33:00 PM	25	1293.50	TQEX
GENMAB A/S	15-Apr-2025	1:33:59 PM	2	1295.00	CEUX
GENMAB A/S	15-Apr-2025	1:37:07 PM	77	1295.50	XCSE
GENMAB A/S	15-Apr-2025	1:37:07 PM	9	1295.50	XCSE
GENMAB A/S	15-Apr-2025	1:37:07 PM	27	1295.50	TQEX
GENMAB A/S	15-Apr-2025	1:37:07 PM	34	1295.50	AQEU
GENMAB A/S	15-Apr-2025	1:37:30 PM	90	1295.50	XCSE
GENMAB A/S	15-Apr-2025	1:38:31 PM	45	1295.00	CEUX
GENMAB A/S	15-Apr-2025	1:39:45 PM	90	1295.50	XCSE
GENMAB A/S	15-Apr-2025	1:39:45 PM	53	1295.50	CEUX
GENMAB A/S	15-Apr-2025	1:39:55 PM	28	1296.00	AQEU
GENMAB A/S	15-Apr-2025	1:40:00 PM	17	1295.50	CEUX
GENMAB A/S	15-Apr-2025	1:40:26 PM	12	1295.50	CEUX
GENMAB A/S	15-Apr-2025	1:41:11 PM	4	1295.50	CEUX
GENMAB A/S	15-Apr-2025	1:41:21 PM	28	1295.00	AQEU
GENMAB A/S	15-Apr-2025	1:41:30 PM	51	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:41:30 PM	6	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:41:44 PM	25	1294.50	TQEX
GENMAB A/S	15-Apr-2025	1:43:51 PM	79	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:43:57 PM	9	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:46:07 PM	36	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:46:07 PM	20	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:46:07 PM	34	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:46:52 PM	36	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:46:52 PM	22	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:46:52 PM	42	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:47:33 PM	49	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:47:33 PM	35	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:47:33 PM	50	1294.50	XCSE
GENMAB A/S	15-Apr-2025	1:47:41 PM	27	1293.50	XCSE
GENMAB A/S	15-Apr-2025	1:47:41 PM	25	1294.00	TQEX
GENMAB A/S	15-Apr-2025	1:47:41 PM	26	1294.00	AQEU
GENMAB A/S	15-Apr-2025	1:47:41 PM	23	1293.00	AQEU
GENMAB A/S	15-Apr-2025	1:47:41 PM	42	1294.00	CEUX
GENMAB A/S	15-Apr-2025	1:47:55 PM	5	1293.00	CEUX
GENMAB A/S	15-Apr-2025	1:48:19 PM	30	1293.00	TQEX
GENMAB A/S	15-Apr-2025	1:48:19 PM	26	1293.00	CEUX
GENMAB A/S	15-Apr-2025	1:48:22 PM	84	1292.50	XCSE
GENMAB A/S	15-Apr-2025	1:48:24 PM	28	1292.00	CEUX
GENMAB A/S	15-Apr-2025	1:49:51 PM	89	1293.00	CEUX

100

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	1:50:52 PM	50	1292.50	XCSE
GENMAB A/S	15-Apr-2025	1:50:52 PM	36	1292.50	XCSE
GENMAB A/S	15-Apr-2025	1:51:36 PM	84	1291.00	XCSE
GENMAB A/S	15-Apr-2025	1:51:36 PM	58	1292.00	CEUX
GENMAB A/S	15-Apr-2025	1:52:01 PM	26	1291.00	TQEX
GENMAB A/S	15-Apr-2025	1:52:02 PM	30	1291.00	AQEU
GENMAB A/S	15-Apr-2025	1:54:12 PM	35	1293.00	XCSE
GENMAB A/S	15-Apr-2025	1:54:12 PM	19	1293.00	XCSE
GENMAB A/S	15-Apr-2025	1:54:12 PM	25	1292.50	AQEU
GENMAB A/S	15-Apr-2025	1:54:12 PM	8	1293.00	CEUX
GENMAB A/S	15-Apr-2025	1:54:12 PM	8	1293.00	CEUX
GENMAB A/S	15-Apr-2025	1:55:01 PM	1	1294.00	CEUX
GENMAB A/S	15-Apr-2025	1:56:41 PM	43	1293.00	XCSE
GENMAB A/S	15-Apr-2025	1:56:41 PM	25	1293.50	TQEX
GENMAB A/S	15-Apr-2025	1:56:41 PM	91	1293.50	CEUX
GENMAB A/S	15-Apr-2025	1:57:22 PM	28	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:57:22 PM	28	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:58:08 PM	27	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:58:09 PM	27	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:58:09 PM	27	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:58:09 PM	27	1294.00	XCSE
GENMAB A/S	15-Apr-2025	1:58:51 PM	43	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:00:11 PM	5	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:01:30 PM	35	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:01:30 PM	17	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:01:30 PM	37	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:01:30 PM	25	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:01:30 PM	25	1292.50	TQEX
GENMAB A/S	15-Apr-2025	2:01:30 PM	25	1292.50	AQEU
GENMAB A/S	15-Apr-2025	2:01:30 PM	58	1292.50	CEUX
GENMAB A/S	15-Apr-2025	2:01:30 PM	33	1292.50	CEUX
GENMAB A/S	15-Apr-2025	2:01:30 PM	36	1292.50	CEUX
GENMAB A/S	15-Apr-2025	2:01:44 PM	114	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:01:44 PM	83	1292.00	XCSE
GENMAB A/S	15-Apr-2025	2:02:19 PM	14	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:03:17 PM	4	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:03:17 PM	110	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:03:18 PM	39	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:03:18 PM	36	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:03:18 PM	39	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:03:18 PM	51	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:03:18 PM	22	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:03:33 PM	51	1294.00	XCSE

101

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	2:03:44 PM	7	1294.00	CEUX
GENMAB A/S	15-Apr-2025	2:03:47 PM	14	1294.00	CEUX
GENMAB A/S	15-Apr-2025	2:04:13 PM	39	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:04:33 PM	8	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:04:33 PM	80	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:04:33 PM	15	1294.00	CEUX
GENMAB A/S	15-Apr-2025	2:05:47 PM	28	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:05:47 PM	27	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:05:47 PM	34	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:05:47 PM	18	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:05:47 PM	7	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:06:51 PM	85	1295.00	CEUX
GENMAB A/S	15-Apr-2025	2:07:12 PM	14	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:07:12 PM	12	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:07:41 PM	76	1294.50	XCSE
GENMAB A/S	15-Apr-2025	2:07:41 PM	36	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:07:53 PM	45	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:07:53 PM	29	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:08:22 PM	34	1295.50	TQEX
GENMAB A/S	15-Apr-2025	2:08:22 PM	86	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:08:39 PM	114	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:08:39 PM	31	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:08:39 PM	13	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:08:40 PM	29	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:08:50 PM	91	1297.50	XCSE
GENMAB A/S	15-Apr-2025	2:09:21 PM	40	1297.50	AQEU
GENMAB A/S	15-Apr-2025	2:10:12 PM	33	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:10:12 PM	57	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:10:12 PM	34	1297.00	TQEX
GENMAB A/S	15-Apr-2025	2:10:12 PM	86	1297.00	CEUX
GENMAB A/S	15-Apr-2025	2:10:12 PM	36	1297.00	CEUX
GENMAB A/S	15-Apr-2025	2:10:13 PM	27	1297.00	CEUX
GENMAB A/S	15-Apr-2025	2:10:33 PM	12	1297.00	CEUX
GENMAB A/S	15-Apr-2025	2:11:23 PM	23	1297.00	CEUX
GENMAB A/S	15-Apr-2025	2:12:00 PM	11	1297.00	CEUX
GENMAB A/S	15-Apr-2025	2:12:31 PM	8	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:12:31 PM	42	1296.50	AQEU
GENMAB A/S	15-Apr-2025	2:13:41 PM	36	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:13:41 PM	2	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:13:41 PM	32	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:13:41 PM	12	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:13:50 PM	36	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:13:59 PM	16	1296.00	CEUX

102

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	2:14:29 PM	26	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:14:30 PM	14	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:14:30 PM	26	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:14:30 PM	13	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:14:30 PM	14	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:16:31 PM	26	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:16:31 PM	30	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:16:31 PM	13	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:16:31 PM	32	1296.00	TQEX
GENMAB A/S	15-Apr-2025	2:16:31 PM	72	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:16:31 PM	32	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:17:01 PM	4	1296.50	AQEU
GENMAB A/S	15-Apr-2025	2:17:11 PM	91	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:18:11 PM	22	1296.50	AQEU
GENMAB A/S	15-Apr-2025	2:18:12 PM	4	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:18:22 PM	114	1296.50	XCSE
GENMAB A/S	15-Apr-2025	2:19:40 PM	87	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:19:40 PM	36	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:19:40 PM	25	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:19:46 PM	82	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:20:55 PM	13	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:20:55 PM	15	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:20:56 PM	41	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:21:29 PM	24	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:22:21 PM	38	1295.50	AQEU
GENMAB A/S	15-Apr-2025	2:22:21 PM	25	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:23:52 PM	85	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:23:52 PM	37	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:23:52 PM	15	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:23:52 PM	16	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:23:52 PM	46	1296.00	XCSE
GENMAB A/S	15-Apr-2025	2:23:52 PM	27	1295.00	TQEX
GENMAB A/S	15-Apr-2025	2:23:52 PM	25	1295.50	AQEU
GENMAB A/S	15-Apr-2025	2:23:52 PM	36	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:23:52 PM	7	1296.00	CEUX
GENMAB A/S	15-Apr-2025	2:23:52 PM	85	1295.00	CEUX
GENMAB A/S	15-Apr-2025	2:23:53 PM	48	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:23:54 PM	15	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:23:54 PM	17	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:23:54 PM	32	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:24:05 PM	15	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	15	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	23	1295.50	XCSE

103

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	2:24:06 PM	13	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	14	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	13	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	16	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	34	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	17	1295.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:06 PM	38	1295.50	CEUX
GENMAB A/S	15-Apr-2025	2:24:07 PM	85	1295.00	XCSE
GENMAB A/S	15-Apr-2025	2:24:17 PM	35	1294.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:17 PM	13	1294.50	XCSE
GENMAB A/S	15-Apr-2025	2:24:17 PM	88	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:24:17 PM	25	1294.00	TQEX
GENMAB A/S	15-Apr-2025	2:24:17 PM	36	1294.50	AQEU
GENMAB A/S	15-Apr-2025	2:24:17 PM	89	1294.50	CEUX
GENMAB A/S	15-Apr-2025	2:24:17 PM	43	1293.50	CEUX
GENMAB A/S	15-Apr-2025	2:24:21 PM	47	1293.50	CEUX
GENMAB A/S	15-Apr-2025	2:24:28 PM	89	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:25:51 PM	67	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:25:51 PM	24	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:27:59 PM	26	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:27:59 PM	1	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:27:59 PM	15	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:27:59 PM	75	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:27:59 PM	9	1293.00	XCSE
GENMAB A/S	15-Apr-2025	2:27:59 PM	88	1293.50	CEUX
GENMAB A/S	15-Apr-2025	2:29:11 PM	87	1292.50	XCSE
GENMAB A/S	15-Apr-2025	2:29:11 PM	25	1292.50	TQEX
GENMAB A/S	15-Apr-2025	2:29:11 PM	58	1292.50	CEUX
GENMAB A/S	15-Apr-2025	2:29:11 PM	28	1292.50	CEUX
GENMAB A/S	15-Apr-2025	2:33:11 PM	80	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:33:11 PM	11	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:33:11 PM	43	1293.50	TQEX
GENMAB A/S	15-Apr-2025	2:33:11 PM	90	1293.50	CEUX
GENMAB A/S	15-Apr-2025	2:33:13 PM	88	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:33:13 PM	85	1293.50	CEUX
GENMAB A/S	15-Apr-2025	2:33:21 PM	13	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:33:21 PM	13	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:33:21 PM	14	1294.00	XCSE
GENMAB A/S	15-Apr-2025	2:34:52 PM	56	1293.50	XCSE
GENMAB A/S	15-Apr-2025	2:35:04 PM	41	1295.50	AQEU
GENMAB A/S	15-Apr-2025	2:36:41 PM	87	1294.50	XCSE
GENMAB A/S	15-Apr-2025	2:36:41 PM	7	1295.00	CEUX
GENMAB A/S	15-Apr-2025	2:38:22 PM	39	1297.00	XCSE

104

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	2:38:22 PM	14	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:22 PM	14	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:22 PM	46	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:22 PM	1	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:22 PM	39	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:22 PM	20	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:22 PM	6	1296.50	CEUX
GENMAB A/S	15-Apr-2025	2:38:23 PM	48	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:50 PM	87	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:50 PM	41	1297.00	TQEX
GENMAB A/S	15-Apr-2025	2:38:50 PM	84	1297.00	CEUX
GENMAB A/S	15-Apr-2025	2:38:52 PM	39	1297.00	XCSE
GENMAB A/S	15-Apr-2025	2:38:52 PM	14	1297.00	AQEU
GENMAB A/S	15-Apr-2025	2:39:28 PM	85	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:39:28 PM	35	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:39:28 PM	25	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:39:28 PM	35	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:39:28 PM	15	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:39:28 PM	87	1298.50	CEUX
GENMAB A/S	15-Apr-2025	2:39:46 PM	50	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:39:47 PM	36	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:40:01 PM	25	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:40:35 PM	114	1298.50	XCSE
GENMAB A/S	15-Apr-2025	2:40:35 PM	32	1298.50	CEUX
GENMAB A/S	15-Apr-2025	2:40:37 PM	89	1297.50	XCSE
GENMAB A/S	15-Apr-2025	2:40:37 PM	30	1298.00	TQEX
GENMAB A/S	15-Apr-2025	2:40:37 PM	40	1298.00	AQEU
GENMAB A/S	15-Apr-2025	2:40:37 PM	30	1297.50	CEUX
GENMAB A/S	15-Apr-2025	2:40:37 PM	54	1297.50	CEUX
GENMAB A/S	15-Apr-2025	2:40:39 PM	13	1297.00	TQEX
GENMAB A/S	15-Apr-2025	2:43:02 PM	34	1299.50	XCSE
GENMAB A/S	15-Apr-2025	2:43:02 PM	30	1299.50	XCSE
GENMAB A/S	15-Apr-2025	2:43:05 PM	149	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:43:05 PM	25	1300.00	TQEX
GENMAB A/S	15-Apr-2025	2:43:05 PM	52	1300.00	CEUX
GENMAB A/S	15-Apr-2025	2:43:46 PM	37	1300.50	TQEX
GENMAB A/S	15-Apr-2025	2:43:46 PM	64	1300.50	CEUX
GENMAB A/S	15-Apr-2025	2:43:46 PM	27	1300.50	CEUX
GENMAB A/S	15-Apr-2025	2:43:57 PM	85	1301.00	XCSE
GENMAB A/S	15-Apr-2025	2:43:57 PM	5	1301.00	AQEU
GENMAB A/S	15-Apr-2025	2:43:57 PM	29	1301.00	AQEU
GENMAB A/S	15-Apr-2025	2:43:59 PM	84	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:43:59 PM	1	1300.00	XCSE

105

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	2:43:59 PM	90	1300.50	CEUX
GENMAB A/S	15-Apr-2025	2:44:00 PM	36	1300.00	AQEU
GENMAB A/S	15-Apr-2025	2:44:04 PM	60	1299.50	CEUX
GENMAB A/S	15-Apr-2025	2:44:04 PM	27	1299.50	CEUX
GENMAB A/S	15-Apr-2025	2:44:25 PM	14	1299.50	CEUX
GENMAB A/S	15-Apr-2025	2:44:32 PM	72	1299.50	CEUX
GENMAB A/S	15-Apr-2025	2:44:40 PM	89	1299.00	XCSE
GENMAB A/S	15-Apr-2025	2:45:45 PM	90	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:46:27 PM	85	1300.50	XCSE
GENMAB A/S	15-Apr-2025	2:46:27 PM	25	1300.50	TQEX
GENMAB A/S	15-Apr-2025	2:47:38 PM	34	1300.50	XCSE
GENMAB A/S	15-Apr-2025	2:48:14 PM	34	1301.00	TQEX
GENMAB A/S	15-Apr-2025	2:48:14 PM	28	1301.00	AQEU
GENMAB A/S	15-Apr-2025	2:48:18 PM	52	1300.50	XCSE
GENMAB A/S	15-Apr-2025	2:49:03 PM	85	1300.50	CEUX
GENMAB A/S	15-Apr-2025	2:50:51 PM	91	1300.50	XCSE
GENMAB A/S	15-Apr-2025	2:50:51 PM	91	1300.50	CEUX
GENMAB A/S	15-Apr-2025	2:50:52 PM	15	1300.00	AQEU
GENMAB A/S	15-Apr-2025	2:50:55 PM	2	1300.00	AQEU
GENMAB A/S	15-Apr-2025	2:51:02 PM	10	1300.00	AQEU
GENMAB A/S	15-Apr-2025	2:51:03 PM	18	1299.00	AQEU
GENMAB A/S	15-Apr-2025	2:51:03 PM	38	1299.50	CEUX
GENMAB A/S	15-Apr-2025	2:51:13 PM	47	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:51:13 PM	35	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:51:13 PM	13	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:51:13 PM	15	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:51:13 PM	4	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:52:23 PM	42	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:52:23 PM	13	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:52:23 PM	2	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:52:23 PM	34	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:52:23 PM	14	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:52:23 PM	9	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:53:01 PM	90	1299.00	XCSE
GENMAB A/S	15-Apr-2025	2:53:45 PM	15	1299.50	TQEX
GENMAB A/S	15-Apr-2025	2:53:45 PM	87	1300.00	CEUX
GENMAB A/S	15-Apr-2025	2:53:45 PM	4	1300.00	CEUX
GENMAB A/S	15-Apr-2025	2:54:13 PM	6	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:54:13 PM	13	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:54:13 PM	88	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:54:34 PM	88	1300.00	CEUX
GENMAB A/S	15-Apr-2025	2:55:23 PM	21	1300.50	XCSE
GENMAB A/S	15-Apr-2025	2:55:23 PM	1	1300.50	XCSE

106

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	2:55:23 PM	2	1300.50	XCSE
GENMAB A/S	15-Apr-2025	2:57:11 PM	85	1300.00	XCSE
GENMAB A/S	15-Apr-2025	2:57:11 PM	21	1300.50	TQEX
GENMAB A/S	15-Apr-2025	2:57:11 PM	5	1300.50	TQEX
GENMAB A/S	15-Apr-2025	2:57:24 PM	88	1300.50	XCSE
GENMAB A/S	15-Apr-2025	2:58:51 PM	35	1301.00	XCSE
GENMAB A/S	15-Apr-2025	2:58:51 PM	26	1301.00	XCSE
GENMAB A/S	15-Apr-2025	2:58:51 PM	31	1301.00	AQEU
GENMAB A/S	15-Apr-2025	2:58:51 PM	84	1301.00	CEUX
GENMAB A/S	15-Apr-2025	2:59:25 PM	58	1301.50	XCSE
GENMAB A/S	15-Apr-2025	2:59:25 PM	17	1301.50	XCSE
GENMAB A/S	15-Apr-2025	2:59:25 PM	14	1301.50	XCSE
GENMAB A/S	15-Apr-2025	2:59:25 PM	43	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:00:49 PM	2	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:00:49 PM	1	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:00:49 PM	32	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:01:51 PM	84	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:51 PM	35	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:51 PM	20	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:51 PM	17	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:51 PM	42	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:51 PM	2	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:01:51 PM	89	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:01:52 PM	4	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:52 PM	35	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:52 PM	27	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:52 PM	16	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:01:52 PM	32	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:02:49 PM	47	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:02:49 PM	20	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:02:49 PM	24	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:02:49 PM	17	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:02:49 PM	2	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:02:53 PM	91	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:02:53 PM	28	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:02:53 PM	10	1299.50	TQEX
GENMAB A/S	15-Apr-2025	3:02:53 PM	25	1301.00	AQEU
GENMAB A/S	15-Apr-2025	3:02:53 PM	27	1300.00	AQEU
GENMAB A/S	15-Apr-2025	3:02:53 PM	15	1299.00	AQEU
GENMAB A/S	15-Apr-2025	3:02:53 PM	88	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:02:53 PM	84	1300.00	CEUX
GENMAB A/S	15-Apr-2025	3:02:54 PM	84	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:04:43 PM	81	1300.50	XCSE

107

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:05:19 PM	87	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:08:08 PM	12	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:08:30 PM	89	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:09:25 PM	71	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:10:19 PM	35	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:10:19 PM	7	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:10:26 PM	43	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:10:26 PM	25	1300.50	AQEU
GENMAB A/S	15-Apr-2025	3:10:26 PM	32	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:10:26 PM	90	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:11:01 PM	88	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:11:31 PM	22	1300.50	AQEU
GENMAB A/S	15-Apr-2025	3:11:31 PM	72	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:11:36 PM	19	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:11:43 PM	3	1300.50	AQEU
GENMAB A/S	15-Apr-2025	3:12:41 PM	84	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:13:14 PM	15	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:13:14 PM	16	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:13:51 PM	53	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:13:51 PM	37	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:13:51 PM	42	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:13:51 PM	90	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:15:22 PM	85	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:15:22 PM	90	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:16:12 PM	25	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:16:21 PM	64	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:16:45 PM	85	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:16:45 PM	56	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:18:02 PM	35	1302.50	AQEU
GENMAB A/S	15-Apr-2025	3:18:02 PM	30	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:18:23 PM	32	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:18:51 PM	38	1302.00	TQEX
GENMAB A/S	15-Apr-2025	3:19:37 PM	7	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:19:37 PM	13	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:19:37 PM	8	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:19:37 PM	1	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:19:37 PM	8	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:19:37 PM	7	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:19:43 PM	34	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:19:43 PM	16	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:19:43 PM	17	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:19:43 PM	16	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:19:43 PM	7	1302.50	CEUX

108

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:19:43 PM	18	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:20:11 PM	3	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:20:11 PM	3	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:20:11 PM	19	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:21:01 PM	40	1302.50	TQEX
GENMAB A/S	15-Apr-2025	3:21:01 PM	16	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:21:01 PM	8	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:21:01 PM	31	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:21:04 PM	46	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	24	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	15	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	15	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	48	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	17	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	15	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	24	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:04 PM	32	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:21:05 PM	17	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:05 PM	16	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:05 PM	14	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:05 PM	67	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:05 PM	9	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:05 PM	14	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:06 PM	42	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:06 PM	49	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:06 PM	45	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:06 PM	12	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:21:15 PM	35	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:21:15 PM	14	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:21:15 PM	16	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:21:15 PM	24	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:21:15 PM	24	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:15 PM	1	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:21:15 PM	36	1301.50	AQEU
GENMAB A/S	15-Apr-2025	3:21:15 PM	75	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:22:20 PM	81	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:22:20 PM	9	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:22:20 PM	13	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:22:20 PM	7	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:22:20 PM	4	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:22:23 PM	36	1302.00	TQEX
GENMAB A/S	15-Apr-2025	3:22:37 PM	50	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:23:01 PM	37	1302.50	CEUX

109

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:23:14 PM	37	1302.50	AQEU
GENMAB A/S	15-Apr-2025	3:23:53 PM	49	1303.00	CEUX
GENMAB A/S	15-Apr-2025	3:23:53 PM	4	1303.00	CEUX
GENMAB A/S	15-Apr-2025	3:24:05 PM	114	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:24:05 PM	9	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:24:05 PM	36	1302.50	AQEU
GENMAB A/S	15-Apr-2025	3:24:05 PM	91	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:24:16 PM	89	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:24:17 PM	26	1302.50	AQEU
GENMAB A/S	15-Apr-2025	3:24:17 PM	84	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:25:11 PM	91	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:25:11 PM	87	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:25:11 PM	3	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:25:11 PM	1	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:25:11 PM	25	1303.00	AQEU
GENMAB A/S	15-Apr-2025	3:26:34 PM	47	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	35	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	26	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	6	1303.00	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	82	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	2	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	17	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	17	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	35	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	16	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	29	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:34 PM	4	1302.00	TQEX
GENMAB A/S	15-Apr-2025	3:26:34 PM	84	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:26:34 PM	25	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:26:34 PM	31	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:26:34 PM	8	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:26:34 PM	36	1303.00	CEUX
GENMAB A/S	15-Apr-2025	3:26:34 PM	8	1303.00	CEUX
GENMAB A/S	15-Apr-2025	3:26:34 PM	6	1303.00	CEUX
GENMAB A/S	15-Apr-2025	3:26:35 PM	16	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	26	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	16	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	17	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	14	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	26	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	57	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	17	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	14	1302.50	XCSE

110

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:26:35 PM	26	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	15	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:35 PM	41	1302.00	TQEX
GENMAB A/S	15-Apr-2025	3:26:36 PM	48	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:36 PM	16	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:36 PM	15	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:36 PM	26	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:36 PM	9	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:36 PM	30	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:36 PM	17	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:36 PM	14	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:37 PM	17	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:37 PM	26	1302.50	XCSE
GENMAB A/S	15-Apr-2025	3:26:57 PM	26	1302.50	AQEU
GENMAB A/S	15-Apr-2025	3:26:57 PM	84	1302.50	CEUX
GENMAB A/S	15-Apr-2025	3:27:21 PM	77	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:21 PM	9	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:26 PM	11	1302.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:50 PM	13	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:50 PM	35	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:50 PM	14	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:50 PM	17	1302.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:50 PM	85	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:50 PM	3	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.50	AQEU
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.50	AQEU
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.50	AQEU
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.50	AQEU
GENMAB A/S	15-Apr-2025	3:27:50 PM	2	1301.50	AQEU
GENMAB A/S	15-Apr-2025	3:27:50 PM	31	1301.50	AQEU
GENMAB A/S	15-Apr-2025	3:27:50 PM	89	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:27:51 PM	16	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:27:51 PM	9	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:27:52 PM	35	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:52 PM	23	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:52 PM	13	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:27:52 PM	77	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:28:00 PM	89	1300.50	XCSE

111

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:28:00 PM	5	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:28:00 PM	7	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:28:00 PM	5	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:28:00 PM	6	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:28:00 PM	11	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:28:00 PM	1	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:28:00 PM	4	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:28:00 PM	5	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:28:00 PM	6	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:28:00 PM	38	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:28:10 PM	35	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:28:13 PM	59	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:28:41 PM	62	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:29:11 PM	28	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:29:11 PM	31	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:30:00 PM	7	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:00 PM	14	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:00 PM	15	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:00 PM	15	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:00 PM	35	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:00 PM	31	1300.50	AQEU
GENMAB A/S	15-Apr-2025	3:30:00 PM	65	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:30:04 PM	91	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:04 PM	12	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:04 PM	13	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:04 PM	35	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:04 PM	46	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:04 PM	8	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:04 PM	6	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:04 PM	35	1301.00	TQEX
GENMAB A/S	15-Apr-2025	3:30:04 PM	76	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:30:11 PM	85	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:41 PM	25	1300.50	AQEU
GENMAB A/S	15-Apr-2025	3:30:52 PM	6	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	2	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	2	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	2	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	15	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	5	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	3	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	2	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	6	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:52 PM	63	1300.00	CEUX

112

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:30:53 PM	19	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:53 PM	27	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:30:53 PM	14	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:30:53 PM	14	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:31:01 PM	90	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:31:21 PM	28	1299.50	AQEU
GENMAB A/S	15-Apr-2025	3:31:22 PM	18	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:31:29 PM	86	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:31:29 PM	29	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:31:51 PM	88	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:31:51 PM	33	1299.50	TQEX
GENMAB A/S	15-Apr-2025	3:31:53 PM	27	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:31:53 PM	16	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:32:03 PM	17	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:32:03 PM	13	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:32:03 PM	12	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:32:03 PM	46	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:32:05 PM	3	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:32:05 PM	79	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:32:07 PM	45	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:07 PM	39	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:07 PM	32	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:32:22 PM	31	1301.50	TQEX
GENMAB A/S	15-Apr-2025	3:32:27 PM	88	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:32:27 PM	48	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:27 PM	20	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:27 PM	35	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:27 PM	11	1300.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:27 PM	86	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:32:27 PM	29	1301.00	AQEU
GENMAB A/S	15-Apr-2025	3:32:27 PM	26	1300.00	AQEU
GENMAB A/S	15-Apr-2025	3:32:27 PM	84	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:27 PM	86	1300.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:30 PM	3	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	14	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	46	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	2	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	3	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	5	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	4	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	3	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	3	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	5	1299.50	XCSE

113

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:32:30 PM	3	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	7	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	16	1299.50	XCSE
GENMAB A/S	15-Apr-2025	3:32:30 PM	84	1300.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:30 PM	12	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:30 PM	5	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:30 PM	8	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:30 PM	7	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:30 PM	6	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:30 PM	2	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:31 PM	17	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:32:31 PM	68	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:32:31 PM	47	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:32:32 PM	4	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:32:51 PM	89	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:02 PM	6	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:11 PM	35	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:11 PM	19	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:11 PM	17	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:11 PM	16	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:14 PM	88	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:14 PM	16	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:14 PM	14	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:14 PM	16	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:33:14 PM	49	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:14 PM	19	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:14 PM	28	1297.50	TQEX
GENMAB A/S	15-Apr-2025	3:33:14 PM	33	1298.00	AQEU
GENMAB A/S	15-Apr-2025	3:33:14 PM	89	1297.50	CEUX
GENMAB A/S	15-Apr-2025	3:33:31 PM	35	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:31 PM	13	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:31 PM	46	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:31 PM	17	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:31 PM	28	1298.00	AQEU
GENMAB A/S	15-Apr-2025	3:33:32 PM	48	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:32 PM	11	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:33:51 PM	87	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:34:01 PM	80	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:34:01 PM	9	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:34:01 PM	50	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:34:01 PM	12	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:34:19 PM	21	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:34:20 PM	54	1299.50	CEUX

114

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:34:39 PM	27	1301.50	TQEX
GENMAB A/S	15-Apr-2025	3:34:39 PM	11	1301.50	TQEX
GENMAB A/S	15-Apr-2025	3:34:39 PM	34	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:34:39 PM	54	1301.50	CEUX
GENMAB A/S	15-Apr-2025	3:34:51 PM	2	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:34:59 PM	36	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:35:00 PM	12	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:35:00 PM	31	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:35:00 PM	13	1302.00	CEUX
GENMAB A/S	15-Apr-2025	3:35:04 PM	83	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:04 PM	35	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:04 PM	48	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:04 PM	31	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:04 PM	30	1301.00	AQEU
GENMAB A/S	15-Apr-2025	3:35:05 PM	15	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	23	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	16	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	17	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	35	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	22	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	46	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	15	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	17	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	14	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	14	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	13	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	46	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:05 PM	16	1301.50	XCSE
GENMAB A/S	15-Apr-2025	3:35:13 PM	85	1301.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:13 PM	26	1301.00	AQEU
GENMAB A/S	15-Apr-2025	3:35:13 PM	32	1301.00	CEUX
GENMAB A/S	15-Apr-2025	3:35:33 PM	5	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:33 PM	15	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:33 PM	10	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:33 PM	5	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:33 PM	10	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:33 PM	5	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:33 PM	40	1300.00	XCSE
GENMAB A/S	15-Apr-2025	3:35:33 PM	38	1300.50	TQEX
GENMAB A/S	15-Apr-2025	3:35:33 PM	4	1299.50	TQEX
GENMAB A/S	15-Apr-2025	3:35:33 PM	2	1299.50	TQEX
GENMAB A/S	15-Apr-2025	3:35:33 PM	5	1299.50	TQEX
GENMAB A/S	15-Apr-2025	3:35:33 PM	26	1300.00	AQEU

115

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:35:33 PM	90	1300.50	CEUX
GENMAB A/S	15-Apr-2025	3:35:50 PM	23	1299.50	TQEX
GENMAB A/S	15-Apr-2025	3:35:50 PM	20	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:35:50 PM	64	1299.50	CEUX
GENMAB A/S	15-Apr-2025	3:35:51 PM	90	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:36:02 PM	91	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:36:02 PM	87	1298.00	CEUX
GENMAB A/S	15-Apr-2025	3:36:03 PM	41	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:36:03 PM	50	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:36:03 PM	88	1297.00	CEUX
GENMAB A/S	15-Apr-2025	3:36:03 PM	23	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:36:40 PM	89	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:37:01 PM	90	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:37:01 PM	25	1298.00	TQEX
GENMAB A/S	15-Apr-2025	3:37:01 PM	11	1298.00	CEUX
GENMAB A/S	15-Apr-2025	3:37:01 PM	77	1298.00	CEUX
GENMAB A/S	15-Apr-2025	3:37:21 PM	86	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:38:28 PM	86	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:38:29 PM	86	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:38:29 PM	35	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:38:29 PM	24	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:38:29 PM	46	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:38:29 PM	9	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:38:29 PM	25	1298.50	AQEU
GENMAB A/S	15-Apr-2025	3:38:29 PM	90	1298.00	CEUX
GENMAB A/S	15-Apr-2025	3:38:30 PM	31	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:38:31 PM	54	1298.50	XCSE
GENMAB A/S	15-Apr-2025	3:39:01 PM	2	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:06 PM	85	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:06 PM	26	1299.50	AQEU
GENMAB A/S	15-Apr-2025	3:39:10 PM	2	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:33 PM	56	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:43 PM	15	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:43 PM	25	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:53 PM	15	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:53 PM	25	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:53 PM	2	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:39:53 PM	46	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:40:13 PM	32	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:40:31 PM	25	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:40:32 PM	26	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:40:43 PM	3	1299.00	CEUX
GENMAB A/S	15-Apr-2025	3:40:51 PM	80	1299.00	XCSE

116

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:40:51 PM	7	1299.00	XCSE
GENMAB A/S	15-Apr-2025	3:40:52 PM	5	1299.00	AQEU
GENMAB A/S	15-Apr-2025	3:40:53 PM	30	1299.00	AQEU
GENMAB A/S	15-Apr-2025	3:40:56 PM	91	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:40:56 PM	84	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:40:56 PM	91	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:40:56 PM	91	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:40:56 PM	90	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:40:56 PM	91	1292.50	XCSE
GENMAB A/S	15-Apr-2025	3:40:56 PM	86	1291.00	XCSE
GENMAB A/S	15-Apr-2025	3:40:56 PM	27	1298.00	TQEX
GENMAB A/S	15-Apr-2025	3:40:56 PM	26	1296.50	TQEX
GENMAB A/S	15-Apr-2025	3:40:56 PM	33	1295.50	TQEX
GENMAB A/S	15-Apr-2025	3:40:56 PM	35	1298.00	AQEU
GENMAB A/S	15-Apr-2025	3:40:56 PM	25	1297.00	AQEU
GENMAB A/S	15-Apr-2025	3:40:56 PM	85	1298.50	CEUX
GENMAB A/S	15-Apr-2025	3:40:56 PM	85	1297.00	CEUX
GENMAB A/S	15-Apr-2025	3:40:56 PM	84	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:40:56 PM	66	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:40:56 PM	23	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:40:56 PM	86	1294.00	CEUX
GENMAB A/S	15-Apr-2025	3:40:56 PM	87	1292.50	CEUX
GENMAB A/S	15-Apr-2025	3:40:56 PM	28	1291.50	CEUX
GENMAB A/S	15-Apr-2025	3:40:57 PM	29	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:41:28 PM	49	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:41:28 PM	14	1294.50	CEUX
GENMAB A/S	15-Apr-2025	3:41:28 PM	20	1294.50	CEUX
GENMAB A/S	15-Apr-2025	3:41:30 PM	29	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:42:38 PM	91	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:42:38 PM	34	1294.00	TQEX
GENMAB A/S	15-Apr-2025	3:42:54 PM	68	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:42:54 PM	17	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:43:30 PM	87	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:43:51 PM	25	1295.00	TQEX
GENMAB A/S	15-Apr-2025	3:43:51 PM	27	1295.00	AQEU
GENMAB A/S	15-Apr-2025	3:43:51 PM	84	1295.00	CEUX
GENMAB A/S	15-Apr-2025	3:44:11 PM	1	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:44:11 PM	89	1294.50	CEUX
GENMAB A/S	15-Apr-2025	3:44:22 PM	91	1294.50	CEUX
GENMAB A/S	15-Apr-2025	3:44:31 PM	74	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:44:31 PM	12	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:44:31 PM	21	1294.00	TQEX
GENMAB A/S	15-Apr-2025	3:44:31 PM	12	1294.00	TQEX

117

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:44:51 PM	27	1294.00	AQEU
GENMAB A/S	15-Apr-2025	3:44:51 PM	25	1293.50	CEUX
GENMAB A/S	15-Apr-2025	3:45:04 PM	30	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:45:36 PM	84	1293.50	CEUX
GENMAB A/S	15-Apr-2025	3:45:36 PM	3	1293.50	CEUX
GENMAB A/S	15-Apr-2025	3:45:45 PM	47	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:45 PM	46	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:45 PM	13	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:45 PM	86	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	17	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	26	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	46	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	17	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	14	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	26	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	17	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:45:46 PM	46	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:46:07 PM	6	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:07 PM	2	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:07 PM	3	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:07 PM	77	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:07 PM	30	1293.50	AQEU
GENMAB A/S	15-Apr-2025	3:46:07 PM	88	1293.00	CEUX
GENMAB A/S	15-Apr-2025	3:46:19 PM	88	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:19 PM	3	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:19 PM	89	1293.00	CEUX
GENMAB A/S	15-Apr-2025	3:46:47 PM	16	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:47 PM	14	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:47 PM	14	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:46:47 PM	46	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:47:31 PM	28	1295.50	TQEX
GENMAB A/S	15-Apr-2025	3:47:31 PM	91	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:47:32 PM	21	1296.00	TQEX
GENMAB A/S	15-Apr-2025	3:47:32 PM	81	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:47:32 PM	7	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:48:16 PM	28	1297.00	TQEX
GENMAB A/S	15-Apr-2025	3:48:41 PM	86	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:48:41 PM	91	1296.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:02 PM	14	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:49:02 PM	46	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:49:02 PM	21	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:49:02 PM	4	1296.00	TQEX
GENMAB A/S	15-Apr-2025	3:49:02 PM	34	1296.50	AQEU

118

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:49:21 PM	2	1296.00	TQEX
GENMAB A/S	15-Apr-2025	3:49:21 PM	35	1296.50	AQEU
GENMAB A/S	15-Apr-2025	3:49:21 PM	86	1296.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:38 PM	1	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:43 PM	2	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:44 PM	1	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:48 PM	1	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:48 PM	2	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:48 PM	81	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:51 PM	90	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:49:51 PM	42	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:49:51 PM	12	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:49:51 PM	25	1295.50	AQEU
GENMAB A/S	15-Apr-2025	3:49:52 PM	1	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:49:55 PM	46	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:49:58 PM	114	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:50:01 PM	86	1296.50	CEUX
GENMAB A/S	15-Apr-2025	3:50:02 PM	15	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:50:02 PM	25	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:50:35 PM	25	1297.00	TQEX
GENMAB A/S	15-Apr-2025	3:51:22 PM	41	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:51:22 PM	48	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:51:22 PM	3	1297.50	TQEX
GENMAB A/S	15-Apr-2025	3:51:22 PM	22	1297.50	TQEX
GENMAB A/S	15-Apr-2025	3:51:22 PM	88	1297.50	CEUX
GENMAB A/S	15-Apr-2025	3:51:37 PM	12	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:51:37 PM	18	1297.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:21 PM	76	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:21 PM	9	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:21 PM	46	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:21 PM	38	1298.00	TQEX
GENMAB A/S	15-Apr-2025	3:52:21 PM	7	1298.00	AQEU
GENMAB A/S	15-Apr-2025	3:52:27 PM	50	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:27 PM	35	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:27 PM	22	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:27 PM	7	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:27 PM	39	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:27 PM	17	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:27 PM	14	1298.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:27 PM	36	1298.00	AQEU
GENMAB A/S	15-Apr-2025	3:52:27 PM	89	1297.50	CEUX
GENMAB A/S	15-Apr-2025	3:52:28 PM	24	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:28 PM	24	1297.00	XCSE

119

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:52:28 PM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:28 PM	25	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:28 PM	16	1297.00	TQEX
GENMAB A/S	15-Apr-2025	3:52:28 PM	10	1297.00	TQEX
GENMAB A/S	15-Apr-2025	3:52:28 PM	5	1297.00	TQEX
GENMAB A/S	15-Apr-2025	3:52:28 PM	25	1297.00	AQEU
GENMAB A/S	15-Apr-2025	3:52:28 PM	1	1297.50	CEUX
GENMAB A/S	15-Apr-2025	3:52:28 PM	90	1297.50	CEUX
GENMAB A/S	15-Apr-2025	3:52:30 PM	46	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	17	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	35	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	16	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	16	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	59	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	16	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:30 PM	1	1297.00	AQEU
GENMAB A/S	15-Apr-2025	3:52:30 PM	12	1296.50	CEUX
GENMAB A/S	15-Apr-2025	3:52:30 PM	31	1296.50	CEUX
GENMAB A/S	15-Apr-2025	3:52:31 PM	14	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:31 PM	23	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:32 PM	87	1297.00	CEUX
GENMAB A/S	15-Apr-2025	3:52:35 PM	35	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	28	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	35	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	1	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	50	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	17	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	28	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:35 PM	4	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:52:36 PM	17	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:36 PM	28	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:36 PM	14	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:36 PM	55	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:36 PM	37	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:52:52 PM	14	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:53:05 PM	90	1296.00	XCSE
GENMAB A/S	15-Apr-2025	3:53:05 PM	35	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:53:05 PM	46	1296.00	XCSE
GENMAB A/S	15-Apr-2025	3:53:05 PM	33	1296.00	XCSE
GENMAB A/S	15-Apr-2025	3:53:05 PM	38	1296.00	TQEX

120

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:53:05 PM	30	1296.00	AQEU
GENMAB A/S	15-Apr-2025	3:53:05 PM	11	1296.50	CEUX
GENMAB A/S	15-Apr-2025	3:53:05 PM	74	1296.50	CEUX
GENMAB A/S	15-Apr-2025	3:53:05 PM	88	1295.50	CEUX
GENMAB A/S	15-Apr-2025	3:53:06 PM	29	1295.00	CEUX
GENMAB A/S	15-Apr-2025	3:53:40 PM	18	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:53:51 PM	91	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:53:52 PM	49	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:53:52 PM	46	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:53:52 PM	10	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:53:52 PM	34	1296.50	AQEU
GENMAB A/S	15-Apr-2025	3:53:54 PM	41	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:53:54 PM	5	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:54:01 PM	10	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:54:18 PM	22	1296.50	TQEX
GENMAB A/S	15-Apr-2025	3:54:18 PM	7	1296.50	TQEX
GENMAB A/S	15-Apr-2025	3:54:21 PM	1	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:54:47 PM	87	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:55:24 PM	26	1296.50	TQEX
GENMAB A/S	15-Apr-2025	3:55:27 PM	25	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:55:30 PM	35	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:55:30 PM	22	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:55:30 PM	15	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:55:30 PM	42	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:55:30 PM	89	1297.00	CEUX
GENMAB A/S	15-Apr-2025	3:55:31 PM	17	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:55:31 PM	46	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:55:31 PM	22	1297.00	XCSE
GENMAB A/S	15-Apr-2025	3:55:31 PM	60	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:01 PM	87	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:04 PM	49	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:04 PM	35	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:04 PM	16	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:04 PM	85	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:25 PM	49	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:33 PM	67	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:33 PM	21	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:53 PM	48	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:53 PM	29	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:56:53 PM	27	1296.00	TQEX
GENMAB A/S	15-Apr-2025	3:56:53 PM	14	1296.00	AQEU
GENMAB A/S	15-Apr-2025	3:56:53 PM	18	1296.00	AQEU
GENMAB A/S	15-Apr-2025	3:56:53 PM	5	1296.00	CEUX

121

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:56:53 PM	79	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:57:03 PM	13	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:57:03 PM	7	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:57:03 PM	59	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:57:03 PM	11	1296.50	XCSE
GENMAB A/S	15-Apr-2025	3:57:17 PM	27	1296.00	TQEX
GENMAB A/S	15-Apr-2025	3:57:17 PM	3	1296.00	TQEX
GENMAB A/S	15-Apr-2025	3:57:17 PM	88	1296.00	CEUX
GENMAB A/S	15-Apr-2025	3:57:21 PM	60	1295.50	XCSE
GENMAB A/S	15-Apr-2025	3:57:51 PM	5	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:57:51 PM	31	1295.00	AQEU
GENMAB A/S	15-Apr-2025	3:57:51 PM	53	1295.00	CEUX
GENMAB A/S	15-Apr-2025	3:58:15 PM	35	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:58:15 PM	28	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:58:15 PM	46	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:58:15 PM	5	1295.00	XCSE
GENMAB A/S	15-Apr-2025	3:58:15 PM	34	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:21 PM	48	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:21 PM	27	1294.50	TQEX
GENMAB A/S	15-Apr-2025	3:58:42 PM	85	1294.50	CEUX
GENMAB A/S	15-Apr-2025	3:58:44 PM	48	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:44 PM	35	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:44 PM	15	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:44 PM	16	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:46 PM	25	1294.00	AQEU
GENMAB A/S	15-Apr-2025	3:58:54 PM	35	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:58:54 PM	17	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:58:54 PM	14	1294.00	XCSE
GENMAB A/S	15-Apr-2025	3:58:54 PM	9	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:54 PM	27	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:54 PM	12	1294.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:54 PM	24	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:58:54 PM	32	1294.00	AQEU
GENMAB A/S	15-Apr-2025	3:58:54 PM	32	1293.50	CEUX
GENMAB A/S	15-Apr-2025	3:58:54 PM	31	1293.50	CEUX
GENMAB A/S	15-Apr-2025	3:59:08 PM	61	1293.50	XCSE
GENMAB A/S	15-Apr-2025	3:59:08 PM	28	1293.50	CEUX
GENMAB A/S	15-Apr-2025	3:59:20 PM	87	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:59:20 PM	31	1292.50	TQEX
GENMAB A/S	15-Apr-2025	3:59:20 PM	90	1292.50	CEUX
GENMAB A/S	15-Apr-2025	3:59:21 PM	25	1292.50	AQEU
GENMAB A/S	15-Apr-2025	3:59:41 PM	42	1293.00	XCSE
GENMAB A/S	15-Apr-2025	3:59:46 PM	36	1292.50	XCSE

122

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	3:59:46 PM	90	1292.00	XCSE
GENMAB A/S	15-Apr-2025	3:59:46 PM	82	1292.50	CEUX
GENMAB A/S	15-Apr-2025	3:59:46 PM	7	1292.50	CEUX
GENMAB A/S	15-Apr-2025	3:59:59 PM	64	1291.50	XCSE
GENMAB A/S	15-Apr-2025	3:59:59 PM	27	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:00:14 PM	85	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:00:21 PM	89	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:00:48 PM	90	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:00:58 PM	37	1292.50	AQEU
GENMAB A/S	15-Apr-2025	4:01:11 PM	31	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:01:11 PM	80	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:01:11 PM	4	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:01:12 PM	71	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:01:12 PM	14	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:01:18 PM	20	1291.00	TQEX
GENMAB A/S	15-Apr-2025	4:01:18 PM	17	1291.00	TQEX
GENMAB A/S	15-Apr-2025	4:01:18 PM	84	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:01:19 PM	84	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:01:28 PM	85	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:01:45 PM	77	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:01:45 PM	7	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:02:00 PM	87	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:02:00 PM	85	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:02:00 PM	88	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:02:14 PM	86	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:02:14 PM	46	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:02:24 PM	72	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:02:24 PM	52	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:02:24 PM	25	1288.50	AQEU
GENMAB A/S	15-Apr-2025	4:02:57 PM	27	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:03:00 PM	81	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:03:20 PM	15	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:03:20 PM	73	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:03:20 PM	19	1290.00	TQEX
GENMAB A/S	15-Apr-2025	4:03:20 PM	16	1290.00	TQEX
GENMAB A/S	15-Apr-2025	4:03:23 PM	31	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:03:23 PM	25	1289.50	AQEU
GENMAB A/S	15-Apr-2025	4:03:24 PM	88	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:03:24 PM	28	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:03:24 PM	8	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:03:26 PM	86	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:03:26 PM	2	1288.50	AQEU
GENMAB A/S	15-Apr-2025	4:03:53 PM	87	1288.00	XCSE

123

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:03:53 PM	37	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:03:53 PM	15	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:04:13 PM	44	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:04:17 PM	22	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:04:17 PM	14	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:04:17 PM	34	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:04:22 PM	88	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:04:22 PM	36	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:04:34 PM	87	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:04:34 PM	2	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:04:34 PM	26	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:04:35 PM	36	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:05:01 PM	87	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:05:13 PM	27	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:05:13 PM	11	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:05:22 PM	44	1286.00	CEUX
GENMAB A/S	15-Apr-2025	4:05:23 PM	69	1285.50	XCSE
GENMAB A/S	15-Apr-2025	4:05:23 PM	19	1285.50	XCSE
GENMAB A/S	15-Apr-2025	4:05:37 PM	50	1285.00	XCSE
GENMAB A/S	15-Apr-2025	4:05:37 PM	39	1285.00	XCSE
GENMAB A/S	15-Apr-2025	4:05:37 PM	27	1285.00	CEUX
GENMAB A/S	15-Apr-2025	4:06:29 PM	35	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:06:29 PM	29	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:06:29 PM	46	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:06:30 PM	85	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:06:31 PM	100	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:06:46 PM	36	1288.50	TQEX
GENMAB A/S	15-Apr-2025	4:07:01 PM	89	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:07:01 PM	77	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:07:02 PM	32	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:07:31 PM	89	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:07:31 PM	33	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:08:20 PM	46	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:08:20 PM	29	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:08:20 PM	52	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:08:20 PM	32	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:08:20 PM	36	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:08:38 PM	27	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:08:51 PM	84	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:08:53 PM	32	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:09:02 PM	35	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:02 PM	13	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:02 PM	32	1288.50	CEUX

124

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:09:03 PM	35	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:03 PM	28	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:03 PM	46	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:03 PM	40	1288.00	TQEX
GENMAB A/S	15-Apr-2025	4:09:03 PM	66	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:09:03 PM	21	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:09:03 PM	42	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:09:15 PM	35	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:09:15 PM	15	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:09:15 PM	46	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:09:33 PM	49	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:33 PM	35	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:33 PM	16	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:50 PM	50	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:50 PM	86	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:09:50 PM	87	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	2	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	3	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	5	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	15	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	10	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	2	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	7	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	2	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	24	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	7	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:09:50 PM	3	1289.50	AQEU
GENMAB A/S	15-Apr-2025	4:09:56 PM	90	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	16	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:10:22 PM	34	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:10:22 PM	6	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	18	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	9	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	5	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	7	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	19	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	2	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	2	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:22 PM	9	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:10:23 PM	15	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:10:23 PM	10	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:10:23 PM	89	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:10:51 PM	48	1292.00	XCSE

125

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:10:51 PM	15	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:10:51 PM	62	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:11:04 PM	14	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:11:07 PM	2	1292.50	TQEX
GENMAB A/S	15-Apr-2025	4:11:07 PM	3	1292.50	TQEX
GENMAB A/S	15-Apr-2025	4:11:26 PM	64	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:11:26 PM	26	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:11:26 PM	4	1292.50	TQEX
GENMAB A/S	15-Apr-2025	4:11:26 PM	24	1292.50	TQEX
GENMAB A/S	15-Apr-2025	4:11:26 PM	24	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:11:26 PM	8	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:11:26 PM	2	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:11:26 PM	25	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:11:26 PM	3	1292.50	AQEU
GENMAB A/S	15-Apr-2025	4:11:26 PM	34	1292.50	AQEU
GENMAB A/S	15-Apr-2025	4:11:51 PM	14	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:11:51 PM	16	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:11:52 PM	18	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:11:52 PM	14	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:11:52 PM	18	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:11:52 PM	14	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:12:11 PM	85	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:12:11 PM	70	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:12:11 PM	28	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:12:11 PM	16	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:12:11 PM	27	1292.00	TQEX
GENMAB A/S	15-Apr-2025	4:12:11 PM	81	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:12:11 PM	42	1293.00	AQEU
GENMAB A/S	15-Apr-2025	4:12:12 PM	64	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:12:12 PM	20	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:12:30 PM	89	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:12:30 PM	76	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:12:49 PM	59	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:12:49 PM	42	1292.50	TQEX
GENMAB A/S	15-Apr-2025	4:12:49 PM	54	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:13:27 PM	15	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:13:27 PM	2	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:13:27 PM	8	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:13:27 PM	3	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:27 PM	4	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:27 PM	12	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:28 PM	16	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:13:28 PM	10	1293.00	CEUX

126

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:13:28 PM	20	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:13:28 PM	10	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:13:28 PM	10	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:13:28 PM	10	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:13:28 PM	6	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:13:28 PM	3	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:13:43 PM	17	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:43 PM	14	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:43 PM	20	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:43 PM	35	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:43 PM	28	1293.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:45 PM	60	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:13:45 PM	34	1293.00	CEUX
GENMAB A/S	15-Apr-2025	4:14:07 PM	65	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:14:12 PM	9	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:14:12 PM	75	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:14:19 PM	57	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:14:24 PM	6	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:24 PM	20	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:24 PM	20	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:24 PM	9	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:24 PM	33	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:34 PM	3	1290.50	TQEX
GENMAB A/S	15-Apr-2025	4:14:41 PM	42	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:41 PM	32	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:41 PM	23	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:14:41 PM	8	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:14:46 PM	31	1290.00	AQEU
GENMAB A/S	15-Apr-2025	4:14:54 PM	91	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:14:54 PM	37	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:15:24 PM	79	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:15:34 PM	28	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:15:51 PM	2	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:15:51 PM	3	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:15:51 PM	7	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:15:51 PM	8	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:15:51 PM	65	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:15:51 PM	10	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:15:51 PM	24	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:15:51 PM	5	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:15:51 PM	10	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:15:51 PM	40	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:15:51 PM	10	1289.50	CEUX

127

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:15:51 PM	5	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:15:51 PM	3	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:16:25 PM	2	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:16:25 PM	68	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:16:30 PM	114	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:16:32 PM	4	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:16:32 PM	7	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:16:32 PM	10	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:16:32 PM	3	1291.00	AQEU
GENMAB A/S	15-Apr-2025	4:16:32 PM	5	1291.00	AQEU
GENMAB A/S	15-Apr-2025	4:16:32 PM	20	1291.00	AQEU
GENMAB A/S	15-Apr-2025	4:16:43 PM	1	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:16:49 PM	15	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:16:49 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:16:49 PM	18	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:16:49 PM	15	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:16:49 PM	9	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:17:15 PM	85	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:17:15 PM	4	1291.00	TQEX
GENMAB A/S	15-Apr-2025	4:17:15 PM	35	1291.00	TQEX
GENMAB A/S	15-Apr-2025	4:17:15 PM	67	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:17:15 PM	4	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:17:30 PM	84	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:17:30 PM	38	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:17:31 PM	84	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:17:31 PM	47	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:17:34 PM	91	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:17:34 PM	37	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:17:35 PM	85	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:17:42 PM	26	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:17:49 PM	38	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:17:49 PM	4	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:17:57 PM	26	1285.50	XCSE
GENMAB A/S	15-Apr-2025	4:17:57 PM	25	1285.50	CEUX
GENMAB A/S	15-Apr-2025	4:17:57 PM	25	1285.50	AQEU
GENMAB A/S	15-Apr-2025	4:18:00 PM	43	1285.00	CEUX
GENMAB A/S	15-Apr-2025	4:18:06 PM	28	1285.50	XCSE
GENMAB A/S	15-Apr-2025	4:18:43 PM	47	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:18:49 PM	39	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:18:57 PM	1	1286.00	AQEU
GENMAB A/S	15-Apr-2025	4:18:57 PM	24	1286.00	AQEU
GENMAB A/S	15-Apr-2025	4:19:03 PM	3	1285.50	XCSE
GENMAB A/S	15-Apr-2025	4:19:03 PM	27	1285.50	CEUX

128

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:19:21 PM	31	1284.50	XCSE
GENMAB A/S	15-Apr-2025	4:19:21 PM	26	1284.50	CEUX
GENMAB A/S	15-Apr-2025	4:19:33 PM	15	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:19:33 PM	49	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:19:34 PM	29	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:19:51 PM	28	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:19:51 PM	5	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:19:51 PM	57	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:20:02 PM	17	1284.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:02 PM	10	1284.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:02 PM	6	1284.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:02 PM	15	1284.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:16 PM	90	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:20:16 PM	31	1284.50	XCSE
GENMAB A/S	15-Apr-2025	4:20:18 PM	41	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	8	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	3	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	8	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	3	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	3	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	3	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	2	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	2	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	7	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	3	1283.50	CEUX
GENMAB A/S	15-Apr-2025	4:20:18 PM	45	1284.00	AQEU
GENMAB A/S	15-Apr-2025	4:20:34 PM	24	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:20:34 PM	15	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:20:34 PM	52	1284.00	XCSE
GENMAB A/S	15-Apr-2025	4:20:34 PM	26	1284.00	CEUX
GENMAB A/S	15-Apr-2025	4:20:51 PM	36	1284.50	CEUX
GENMAB A/S	15-Apr-2025	4:21:10 PM	30	1285.50	CEUX
GENMAB A/S	15-Apr-2025	4:21:13 PM	48	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:21:13 PM	35	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:21:13 PM	17	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:21:25 PM	19	1285.50	CEUX
GENMAB A/S	15-Apr-2025	4:21:25 PM	6	1285.50	CEUX
GENMAB A/S	15-Apr-2025	4:21:54 PM	88	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:21:54 PM	10	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:21:54 PM	20	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:21:54 PM	13	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:21:54 PM	5	1286.00	AQEU
GENMAB A/S	15-Apr-2025	4:21:54 PM	20	1286.00	AQEU

129

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:21:54 PM	6	1286.00	AQEU
GENMAB A/S	15-Apr-2025	4:21:54 PM	5	1286.00	AQEU
GENMAB A/S	15-Apr-2025	4:21:54 PM	2	1286.00	AQEU
GENMAB A/S	15-Apr-2025	4:22:03 PM	3	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:22:03 PM	6	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:22:03 PM	20	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:22:03 PM	5	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:22:03 PM	17	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:22:03 PM	5	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:22:13 PM	3	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:22:23 PM	2	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:22:38 PM	62	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:22:38 PM	29	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:22:39 PM	20	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:22:48 PM	1	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:22:53 PM	5	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:22:53 PM	24	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:22:54 PM	114	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:23:14 PM	34	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:23:14 PM	13	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:23:14 PM	57	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:23:49 PM	62	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:23:49 PM	89	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:24:02 PM	4	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:24:02 PM	8	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:24:02 PM	2	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:24:02 PM	11	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:24:02 PM	3	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:24:02 PM	22	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:24:02 PM	2	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:24:02 PM	68	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:24:02 PM	16	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:24:02 PM	20	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:24:41 PM	21	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:24:41 PM	91	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:24:41 PM	32	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:25:32 PM	57	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:32 PM	29	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:32 PM	18	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:32 PM	10	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:32 PM	59	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:32 PM	11	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:25:38 PM	45	1289.00	XCSE

130

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:25:40 PM	5	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:57 PM	30	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:57 PM	57	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:57 PM	18	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:57 PM	9	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:57 PM	2	1288.50	TQEX
GENMAB A/S	15-Apr-2025	4:25:57 PM	16	1288.50	TQEX
GENMAB A/S	15-Apr-2025	4:25:57 PM	2	1288.50	TQEX
GENMAB A/S	15-Apr-2025	4:25:57 PM	20	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:25:57 PM	36	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:25:57 PM	7	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:25:57 PM	64	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:25:58 PM	47	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:58 PM	15	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:25:58 PM	52	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:26:03 PM	10	1288.50	TQEX
GENMAB A/S	15-Apr-2025	4:26:08 PM	37	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:26:08 PM	64	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:26:08 PM	24	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:26:08 PM	3	1288.50	TQEX
GENMAB A/S	15-Apr-2025	4:26:17 PM	28	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:26:17 PM	59	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:26:17 PM	27	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:26:17 PM	39	1287.50	AQEU
GENMAB A/S	15-Apr-2025	4:27:06 PM	114	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:27:06 PM	59	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:27:09 PM	30	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:27:09 PM	2	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:27:09 PM	32	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:27:09 PM	5	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:27:28 PM	38	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:27:29 PM	26	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:27:41 PM	3	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:27:58 PM	90	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:28:00 PM	36	1289.00	AQEU
GENMAB A/S	15-Apr-2025	4:28:19 PM	81	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:28:52 PM	86	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:52 PM	10	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:52 PM	10	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:52 PM	15	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:52 PM	13	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:52 PM	17	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:52 PM	15	1289.50	XCSE

131

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:28:52 PM	10	1289.50	TQEX
GENMAB A/S	15-Apr-2025	4:28:52 PM	34	1289.50	TQEX
GENMAB A/S	15-Apr-2025	4:28:52 PM	1	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:28:58 PM	89	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	18	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	18	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	4	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	2	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	5	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	3	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	3	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	3	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	10	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	35	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:28:58 PM	13	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:29:21 PM	45	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:29:21 PM	36	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:29:21 PM	7	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:29:21 PM	6	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:29:37 PM	46	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:29:37 PM	15	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:29:37 PM	18	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:29:37 PM	57	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:29:37 PM	17	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:29:37 PM	7	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:29:37 PM	4	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:29:37 PM	8	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:29:37 PM	7	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:29:37 PM	5	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:29:37 PM	3	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:29:37 PM	23	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:29:37 PM	58	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:30:02 PM	45	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:30:02 PM	31	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:30:03 PM	55	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:30:15 PM	8	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:30:24 PM	14	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:30:28 PM	47	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:30:28 PM	7	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:30:29 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:30:33 PM	82	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:30:33 PM	5	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:30:33 PM	70	1286.50	CEUX

132

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:30:33 PM	21	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:31:00 PM	32	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:31:12 PM	57	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:31:12 PM	15	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:31:12 PM	15	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:31:12 PM	18	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:31:12 PM	9	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:31:12 PM	15	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:31:12 PM	10	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:31:12 PM	15	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:31:12 PM	38	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:31:21 PM	13	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:31:51 PM	91	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:31:51 PM	2	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:31:51 PM	43	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:32:02 PM	13	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:32:02 PM	20	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:32:02 PM	2	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:32:11 PM	32	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:32:12 PM	35	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:18 PM	35	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:32:18 PM	90	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:36 PM	3	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:36 PM	4	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:32:36 PM	36	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:32:36 PM	8	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:32:36 PM	14	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:32:36 PM	11	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:32:38 PM	48	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:38 PM	17	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:38 PM	14	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:38 PM	17	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:38 PM	18	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:43 PM	48	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:43 PM	1	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:32:43 PM	36	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:32:43 PM	2	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:33:28 PM	87	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	4	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	5	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	5	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	6	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	3	1287.50	XCSE

133

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:34:08 PM	2	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	15	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	3	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	16	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:34:08 PM	22	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:34:08 PM	4	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	36	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	8	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	8	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	26	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	1	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	32	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	10	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	22	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:08 PM	25	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:34:20 PM	50	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:20 PM	10	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:20 PM	5	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:20 PM	10	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:20 PM	5	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:20 PM	5	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:20 PM	5	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:20 PM	15	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:34:20 PM	10	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:34:21 PM	15	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:21 PM	15	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:21 PM	57	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:21 PM	27	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:21 PM	18	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:21 PM	24	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:21 PM	15	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:21 PM	15	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:34:47 PM	16	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:47 PM	26	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:47 PM	18	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:47 PM	34	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:47 PM	20	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:47 PM	32	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:47 PM	59	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:48 PM	47	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:48 PM	16	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:48 PM	17	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:48 PM	15	1288.00	XCSE

134

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:34:48 PM	14	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:48 PM	32	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:34:49 PM	3	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:49 PM	5	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:49 PM	11	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	14	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	3	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	4	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	4	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	6	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	15	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	5	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:49 PM	5	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:34:55 PM	32	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:34:55 PM	3	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:55 PM	20	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:34:55 PM	6	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:35:03 PM	34	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:35:03 PM	34	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:35:11 PM	79	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:35:11 PM	2	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:35:11 PM	31	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:35:40 PM	31	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:35:41 PM	26	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:35:41 PM	14	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:36:03 PM	4	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:03 PM	57	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:03 PM	2	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:36:03 PM	4	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:03 PM	3	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:03 PM	22	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:03 PM	25	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:03 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:14 PM	74	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:14 PM	4	1288.00	TQEX
GENMAB A/S	15-Apr-2025	4:36:14 PM	21	1288.00	TQEX
GENMAB A/S	15-Apr-2025	4:36:14 PM	7	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:14 PM	27	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:14 PM	2	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:36:14 PM	3	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:36:15 PM	9	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:15 PM	9	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:15 PM	7	1288.00	XCSE

135

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:36:15 PM	21	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:36:17 PM	65	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:17 PM	7	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:17 PM	10	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:17 PM	12	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:17 PM	3	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:17 PM	7	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:17 PM	12	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:36:36 PM	39	1288.50	CEUX
GENMAB A/S	15-Apr-2025	4:36:37 PM	37	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:43 PM	45	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:36:49 PM	47	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:36:49 PM	28	1288.50	AQEU
GENMAB A/S	15-Apr-2025	4:36:50 PM	18	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:36:50 PM	28	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:37:11 PM	24	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:37:11 PM	28	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:37:11 PM	7	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:37:21 PM	74	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:37:21 PM	9	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:37:25 PM	3	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:37:25 PM	2	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:37:25 PM	11	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:37:25 PM	12	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:37:35 PM	45	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:37:35 PM	10	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:37:35 PM	26	1286.00	CEUX
GENMAB A/S	15-Apr-2025	4:37:39 PM	78	1286.00	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	12	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	2	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	3	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	3	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	8	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	3	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	14	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	25	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	9	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	8	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:38:10 PM	4	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:38:10 PM	9	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:38:10 PM	4	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:38:10 PM	4	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:38:10 PM	7	1286.00	TQEX

136

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:38:31 PM	15	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:38:31 PM	36	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:38:31 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:38:31 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:39:01 PM	1	1286.00	TQEX
GENMAB A/S	15-Apr-2025	4:39:01 PM	69	1286.00	CEUX
GENMAB A/S	15-Apr-2025	4:39:01 PM	36	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:39:01 PM	3	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:39:01 PM	32	1286.50	AQEU
GENMAB A/S	15-Apr-2025	4:39:34 PM	8	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:34 PM	35	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:34 PM	16	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:34 PM	15	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:34 PM	48	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:34 PM	15	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:39:34 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:39:34 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:39:35 PM	15	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:35 PM	19	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:35 PM	17	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:36 PM	17	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:36 PM	16	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:36 PM	7	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:39:36 PM	7	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:39:41 PM	15	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:41 PM	21	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:41 PM	57	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:41 PM	15	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:39:59 PM	4	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:39:59 PM	2	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:39:59 PM	5	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:39:59 PM	62	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:39:59 PM	2	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:03 PM	29	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:40:03 PM	19	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:40:03 PM	7	1287.50	TQEX
GENMAB A/S	15-Apr-2025	4:40:03 PM	3	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:03 PM	76	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:03 PM	5	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:03 PM	20	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:03 PM	4	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:03 PM	18	1287.50	AQEU
GENMAB A/S	15-Apr-2025	4:40:03 PM	3	1287.50	AQEU

137

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:40:03 PM	3	1287.50	AQEU
GENMAB A/S	15-Apr-2025	4:40:03 PM	2	1287.50	AQEU
GENMAB A/S	15-Apr-2025	4:40:12 PM	15	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:40:12 PM	21	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:40:12 PM	57	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:40:12 PM	15	1287.50	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	15	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	15	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	25	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	57	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	2	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	78	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	11	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:40:27 PM	10	1286.50	TQEX
GENMAB A/S	15-Apr-2025	4:40:27 PM	36	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:40:27 PM	5	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:27 PM	15	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:27 PM	3	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:27 PM	10	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:27 PM	2	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:40:27 PM	45	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:41:02 PM	85	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:41:15 PM	36	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:41:15 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:41:15 PM	21	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:41:31 PM	35	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:41:43 PM	7	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:41:43 PM	6	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:41:43 PM	11	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:41:43 PM	40	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:42:01 PM	27	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:01 PM	7	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:01 PM	7	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:01 PM	17	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:01 PM	35	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:01 PM	11	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:02 PM	8	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:02 PM	7	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:02 PM	13	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:07 PM	6	1286.50	CEUX
GENMAB A/S	15-Apr-2025	4:42:07 PM	10	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:42:07 PM	10	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:42:07 PM	10	1287.00	AQEU

138

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:42:07 PM	4	1287.00	AQEU
GENMAB A/S	15-Apr-2025	4:42:16 PM	8	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:42:16 PM	25	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:42:16 PM	25	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:42:21 PM	66	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:42:29 PM	10	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:29 PM	6	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:29 PM	2	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:29 PM	3	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:29 PM	6	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:29 PM	5	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:29 PM	1	1287.00	TQEX
GENMAB A/S	15-Apr-2025	4:42:46 PM	57	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:42:46 PM	19	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:42:46 PM	27	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:42:46 PM	19	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:42:46 PM	18	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:42:46 PM	14	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:42:47 PM	114	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:42:47 PM	13	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:43:01 PM	23	1286.50	XCSE
GENMAB A/S	15-Apr-2025	4:43:01 PM	51	1287.00	CEUX
GENMAB A/S	15-Apr-2025	4:43:31 PM	74	1287.00	XCSE
GENMAB A/S	15-Apr-2025	4:43:31 PM	50	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:43:31 PM	36	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:43:31 PM	26	1287.50	CEUX
GENMAB A/S	15-Apr-2025	4:43:37 PM	2	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:43:37 PM	5	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:43:37 PM	80	1288.00	XCSE
GENMAB A/S	15-Apr-2025	4:43:37 PM	8	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:43:37 PM	7	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:43:37 PM	5	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:43:37 PM	5	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:43:37 PM	2	1288.00	CEUX
GENMAB A/S	15-Apr-2025	4:43:37 PM	2	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:43:37 PM	10	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:43:37 PM	13	1288.00	AQEU
GENMAB A/S	15-Apr-2025	4:44:07 PM	24	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:44:07 PM	5	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:44:08 PM	87	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:08 PM	2	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:08 PM	15	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:08 PM	19	1289.00	CEUX

139

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:44:08 PM	7	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:08 PM	21	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:41 PM	36	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:41 PM	25	1289.00	AQEU
GENMAB A/S	15-Apr-2025	4:44:45 PM	35	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:45 PM	22	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:45 PM	57	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:45 PM	32	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:46 PM	18	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	19	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	35	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	19	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	35	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	15	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	18	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	16	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:46 PM	30	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:53 PM	45	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:53 PM	12	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:44:53 PM	2	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:44:53 PM	8	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:44:53 PM	15	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:44:53 PM	12	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:53 PM	13	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:53 PM	6	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:53 PM	28	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:53 PM	3	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:53 PM	11	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:53 PM	3	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:44:53 PM	7	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:45:09 PM	10	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:09 PM	32	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:10 PM	35	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:14 PM	25	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:15 PM	49	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:15 PM	35	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:15 PM	30	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:22 PM	57	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:22 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:22 PM	9	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:22 PM	2	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:22 PM	2	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:22 PM	5	1289.50	CEUX

140

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:45:22 PM	7	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:26 PM	35	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:26 PM	15	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:26 PM	35	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:26 PM	29	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:26 PM	3	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:26 PM	17	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:29 PM	2	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:54 PM	32	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:45:56 PM	19	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:56 PM	23	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:56 PM	57	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:56 PM	15	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:45:59 PM	24	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:59 PM	57	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:45:59 PM	2	1290.50	TQEX
GENMAB A/S	15-Apr-2025	4:46:00 PM	57	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:00 PM	15	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:03 PM	42	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:46:03 PM	9	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:46:07 PM	5	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:07 PM	3	1290.50	TQEX
GENMAB A/S	15-Apr-2025	4:46:07 PM	36	1290.50	TQEX
GENMAB A/S	15-Apr-2025	4:46:07 PM	42	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:46:07 PM	30	1290.50	AQEU
GENMAB A/S	15-Apr-2025	4:46:13 PM	71	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:13 PM	32	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:46:13 PM	28	1291.00	AQEU
GENMAB A/S	15-Apr-2025	4:46:14 PM	2	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:14 PM	2	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:14 PM	2	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:14 PM	3	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:15 PM	29	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:46:17 PM	87	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:17 PM	1	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:17 PM	49	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:17 PM	17	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:17 PM	18	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:17 PM	15	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:17 PM	26	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:46:18 PM	5	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:18 PM	11	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:18 PM	4	1289.00	XCSE

141

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:46:18 PM	11	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:18 PM	25	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:46:42 PM	35	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:46:50 PM	40	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:46:50 PM	39	1290.50	TQEX
GENMAB A/S	15-Apr-2025	4:47:00 PM	32	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:47:00 PM	11	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:47:00 PM	48	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:47:01 PM	18	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:47:01 PM	7	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:47:11 PM	28	1290.50	AQEU
GENMAB A/S	15-Apr-2025	4:47:12 PM	42	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:47:29 PM	30	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:47:30 PM	15	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:07 PM	35	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:48:07 PM	28	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:48:07 PM	15	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:48:07 PM	15	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:48:07 PM	21	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:48:07 PM	38	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:48:07 PM	29	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:48:16 PM	2	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:21 PM	88	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:21 PM	61	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:48:21 PM	10	1290.00	AQEU
GENMAB A/S	15-Apr-2025	4:48:27 PM	36	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:48:27 PM	7	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:48:27 PM	7	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:48:27 PM	29	1290.00	AQEU
GENMAB A/S	15-Apr-2025	4:48:28 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:28 PM	15	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:28 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:28 PM	15	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:41 PM	15	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:48:41 PM	19	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:48:41 PM	88	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:49 PM	64	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:48:52 PM	25	1290.00	TQEX
GENMAB A/S	15-Apr-2025	4:48:53 PM	57	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:53 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:48:53 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:49:01 PM	22	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:50:08 PM	36	1289.50	CEUX

142

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:50:08 PM	31	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:50:17 PM	36	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:17 PM	8	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:17 PM	8	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:18 PM	20	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:31 PM	36	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:37 PM	13	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:38 PM	16	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:40 PM	7	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:44 PM	15	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:46 PM	10	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:46 PM	17	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:46 PM	19	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:46 PM	15	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:46 PM	34	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:46 PM	8	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:46 PM	8	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:46 PM	22	1289.50	CEUX
GENMAB A/S	15-Apr-2025	4:50:48 PM	15	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:50:48 PM	17	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:50:48 PM	36	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:50:48 PM	46	1289.00	XCSE
GENMAB A/S	15-Apr-2025	4:50:48 PM	42	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:48 PM	36	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:50:48 PM	21	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:50:48 PM	26	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:50:48 PM	99	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:50:49 PM	1	1288.50	XCSE
GENMAB A/S	15-Apr-2025	4:50:49 PM	30	1288.50	TQEX
GENMAB A/S	15-Apr-2025	4:50:49 PM	25	1288.50	AQEU
GENMAB A/S	15-Apr-2025	4:50:49 PM	4	1288.50	AQEU
GENMAB A/S	15-Apr-2025	4:50:49 PM	4	1288.50	AQEU
GENMAB A/S	15-Apr-2025	4:50:50 PM	6	1288.50	AQEU
GENMAB A/S	15-Apr-2025	4:51:01 PM	26	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:51:01 PM	38	1289.00	CEUX
GENMAB A/S	15-Apr-2025	4:51:03 PM	11	1289.00	TQEX
GENMAB A/S	15-Apr-2025	4:51:07 PM	17	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:07 PM	18	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:08 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:08 PM	57	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:08 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:08 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:09 PM	27	1290.00	CEUX

143

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:51:12 PM	15	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:13 PM	19	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:13 PM	18	1290.00	XCSE
GENMAB A/S	15-Apr-2025	4:51:13 PM	16	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:51:19 PM	32	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:51:20 PM	46	1289.50	XCSE
GENMAB A/S	15-Apr-2025	4:51:24 PM	31	1290.00	CEUX
GENMAB A/S	15-Apr-2025	4:51:35 PM	85	1290.50	XCSE
GENMAB A/S	15-Apr-2025	4:51:35 PM	36	1290.50	CEUX
GENMAB A/S	15-Apr-2025	4:51:40 PM	20	1290.50	TQEX
GENMAB A/S	15-Apr-2025	4:51:40 PM	13	1290.50	TQEX
GENMAB A/S	15-Apr-2025	4:51:47 PM	7	1290.50	AQEU
GENMAB A/S	15-Apr-2025	4:51:49 PM	5	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:51:53 PM	18	1291.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:01 PM	18	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:52:02 PM	5	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:52:02 PM	5	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:52:02 PM	15	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:52:02 PM	2	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:52:02 PM	12	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:52:07 PM	3	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:28 PM	9	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:28 PM	38	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:28 PM	6	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:41 PM	36	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:42 PM	36	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:45 PM	17	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:45 PM	19	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:45 PM	15	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:45 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:45 PM	6	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:45 PM	36	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:46 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	13	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	16	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	19	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	17	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	13	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	16	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	17	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	21	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:46 PM	19	1292.00	XCSE

144

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:52:46 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:47 PM	27	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:47 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:47 PM	18	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:47 PM	13	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:47 PM	17	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:47 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:48 PM	17	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:48 PM	18	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:48 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:48 PM	17	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:48 PM	5	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:49 PM	16	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:49 PM	16	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:49 PM	57	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:49 PM	18	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:49 PM	12	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:49 PM	40	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:53 PM	36	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:53 PM	11	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:52:56 PM	57	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:52:56 PM	10	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:52:56 PM	19	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:52:56 PM	55	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:52:56 PM	33	1291.50	AQEU
GENMAB A/S	15-Apr-2025	4:52:56 PM	13	1291.50	AQEU
GENMAB A/S	15-Apr-2025	4:52:59 PM	33	1291.00	XCSE
GENMAB A/S	15-Apr-2025	4:53:02 PM	6	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:53:03 PM	3	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:53:03 PM	5	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:53:03 PM	12	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:53:06 PM	46	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:53:21 PM	18	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:53:21 PM	28	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:53:26 PM	34	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:53:26 PM	57	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:53:26 PM	13	1293.00	XCSE
GENMAB A/S	15-Apr-2025	4:53:26 PM	8	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:53:26 PM	7	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:53:41 PM	80	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:54:01 PM	5	1292.00	XCSE
GENMAB A/S	15-Apr-2025	4:54:01 PM	27	1292.00	TQEX
GENMAB A/S	15-Apr-2025	4:54:01 PM	6	1291.50	TQEX

145

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:54:01 PM	2	1291.50	TQEX
GENMAB A/S	15-Apr-2025	4:54:01 PM	4	1291.50	TQEX
GENMAB A/S	15-Apr-2025	4:54:01 PM	2	1291.50	TQEX
GENMAB A/S	15-Apr-2025	4:54:01 PM	9	1291.50	TQEX
GENMAB A/S	15-Apr-2025	4:54:01 PM	2	1291.50	TQEX
GENMAB A/S	15-Apr-2025	4:54:01 PM	25	1292.00	CEUX
GENMAB A/S	15-Apr-2025	4:54:01 PM	7	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:01 PM	3	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:01 PM	2	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:01 PM	14	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:01 PM	6	1291.50	AQEU
GENMAB A/S	15-Apr-2025	4:54:01 PM	12	1291.50	AQEU
GENMAB A/S	15-Apr-2025	4:54:07 PM	1	1291.50	AQEU
GENMAB A/S	15-Apr-2025	4:54:12 PM	29	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:12 PM	19	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:12 PM	17	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:12 PM	35	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:12 PM	8	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	8	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	8	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	8	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	28	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	12	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	5	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	21	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	7	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	8	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	7	1291.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:12 PM	17	1291.50	AQEU
GENMAB A/S	15-Apr-2025	4:54:13 PM	29	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:13 PM	19	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:13 PM	16	1291.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	18	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	18	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	35	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	16	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	27	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	30	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	16	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	14	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:18 PM	10	1292.50	XCSE
GENMAB A/S	15-Apr-2025	4:54:31 PM	26	1291.50	TQEX
GENMAB A/S	15-Apr-2025	4:54:49 PM	33	1292.50	XCSE

146

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	15-Apr-2025	4:54:49 PM	32	1292.50	CEUX
GENMAB A/S	15-Apr-2025	4:54:50 PM	37	1292.00	AQEU
GENMAB A/S	16-Apr-2025	9:35:44 AM	81	1289.00	XCSE
GENMAB A/S	16-Apr-2025	9:35:44 AM	32	1289.00	CEUX
GENMAB A/S	16-Apr-2025	9:35:44 AM	58	1289.00	CEUX
GENMAB A/S	16-Apr-2025	9:39:30 AM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	9:39:30 AM	88	1290.50	TQEX
GENMAB A/S	16-Apr-2025	9:39:30 AM	29	1289.50	CEUX
GENMAB A/S	16-Apr-2025	9:39:30 AM	21	1290.50	AQEU
GENMAB A/S	16-Apr-2025	9:39:30 AM	65	1290.50	AQEU
GENMAB A/S	16-Apr-2025	9:39:30 AM	82	1289.50	AQEU
GENMAB A/S	16-Apr-2025	9:42:18 AM	15	1289.00	XCSE
GENMAB A/S	16-Apr-2025	9:42:18 AM	37	1289.00	XCSE
GENMAB A/S	16-Apr-2025	9:42:18 AM	75	1289.00	TQEX
GENMAB A/S	16-Apr-2025	9:43:05 AM	16	1289.00	XCSE
GENMAB A/S	16-Apr-2025	9:43:05 AM	10	1289.00	XCSE
GENMAB A/S	16-Apr-2025	9:43:05 AM	48	1289.50	CEUX
GENMAB A/S	16-Apr-2025	9:43:05 AM	28	1289.50	AQEU
GENMAB A/S	16-Apr-2025	9:43:09 AM	20	1289.00	TQEX
GENMAB A/S	16-Apr-2025	9:43:09 AM	16	1289.00	TQEX
GENMAB A/S	16-Apr-2025	9:43:13 AM	61	1288.50	CEUX
GENMAB A/S	16-Apr-2025	9:44:29 AM	11	1289.50	AQEU
GENMAB A/S	16-Apr-2025	9:44:32 AM	39	1289.50	XCSE
GENMAB A/S	16-Apr-2025	9:44:32 AM	20	1289.50	AQEU
GENMAB A/S	16-Apr-2025	9:45:04 AM	20	1289.00	CEUX
GENMAB A/S	16-Apr-2025	9:45:14 AM	43	1289.50	XCSE
GENMAB A/S	16-Apr-2025	9:46:28 AM	24	1289.00	CEUX
GENMAB A/S	16-Apr-2025	9:46:33 AM	19	1289.00	TQEX
GENMAB A/S	16-Apr-2025	9:46:33 AM	9	1289.00	TQEX
GENMAB A/S	16-Apr-2025	9:46:33 AM	12	1289.00	CEUX
GENMAB A/S	16-Apr-2025	9:49:04 AM	38	1288.50	XCSE
GENMAB A/S	16-Apr-2025	9:49:13 AM	37	1287.50	XCSE
GENMAB A/S	16-Apr-2025	9:49:13 AM	27	1287.50	CEUX
GENMAB A/S	16-Apr-2025	9:49:13 AM	4	1287.50	CEUX
GENMAB A/S	16-Apr-2025	9:49:25 AM	26	1286.50	XCSE
GENMAB A/S	16-Apr-2025	9:49:43 AM	33	1287.00	CEUX
GENMAB A/S	16-Apr-2025	9:49:43 AM	54	1287.00	CEUX
GENMAB A/S	16-Apr-2025	9:50:07 AM	64	1286.50	XCSE
GENMAB A/S	16-Apr-2025	9:50:24 AM	38	1286.00	CEUX
GENMAB A/S	16-Apr-2025	9:50:28 AM	27	1285.50	TQEX
GENMAB A/S	16-Apr-2025	9:51:02 AM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	9:51:25 AM	21	1284.50	CEUX
GENMAB A/S	16-Apr-2025	9:51:59 AM	67	1284.50	CEUX

147

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	9:52:00 AM	29	1284.50	TQEX
GENMAB A/S	16-Apr-2025	9:53:41 AM	45	1283.50	CEUX
GENMAB A/S	16-Apr-2025	9:56:20 AM	56	1283.50	XCSE
GENMAB A/S	16-Apr-2025	9:56:20 AM	46	1283.50	CEUX
GENMAB A/S	16-Apr-2025	9:56:29 AM	33	1283.00	TQEX
GENMAB A/S	16-Apr-2025	9:56:30 AM	23	1282.50	CEUX
GENMAB A/S	16-Apr-2025	9:56:44 AM	8	1283.00	TQEX
GENMAB A/S	16-Apr-2025	9:56:53 AM	88	1283.00	XCSE
GENMAB A/S	16-Apr-2025	9:56:53 AM	21	1283.00	TQEX
GENMAB A/S	16-Apr-2025	9:57:05 AM	67	1282.50	CEUX
GENMAB A/S	16-Apr-2025	9:58:25 AM	1	1282.00	XCSE
GENMAB A/S	16-Apr-2025	9:58:25 AM	1	1282.00	XCSE
GENMAB A/S	16-Apr-2025	9:58:25 AM	47	1282.00	XCSE
GENMAB A/S	16-Apr-2025	9:58:25 AM	28	1282.50	AQEU
GENMAB A/S	16-Apr-2025	9:58:29 AM	29	1282.00	TQEX
GENMAB A/S	16-Apr-2025	9:58:29 AM	32	1282.00	CEUX
GENMAB A/S	16-Apr-2025	9:58:29 AM	79	1281.50	CEUX
GENMAB A/S	16-Apr-2025	10:00:08 AM	92	1281.50	XCSE
GENMAB A/S	16-Apr-2025	10:00:19 AM	35	1281.00	TQEX
GENMAB A/S	16-Apr-2025	10:00:19 AM	15	1281.00	CEUX
GENMAB A/S	16-Apr-2025	10:00:19 AM	33	1281.00	AQEU
GENMAB A/S	16-Apr-2025	10:01:26 AM	91	1282.00	XCSE
GENMAB A/S	16-Apr-2025	10:01:26 AM	15	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:01:26 AM	13	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:01:28 AM	12	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:01:30 AM	61	1283.00	XCSE
GENMAB A/S	16-Apr-2025	10:02:26 AM	31	1283.00	XCSE
GENMAB A/S	16-Apr-2025	10:03:23 AM	36	1283.00	CEUX
GENMAB A/S	16-Apr-2025	10:03:23 AM	49	1283.00	CEUX
GENMAB A/S	16-Apr-2025	10:03:32 AM	38	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:03:32 AM	21	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:03:32 AM	35	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:03:59 AM	90	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:03:59 AM	7	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:03:59 AM	25	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:03:59 AM	41	1284.00	TQEX
GENMAB A/S	16-Apr-2025	10:03:59 AM	86	1284.00	CEUX
GENMAB A/S	16-Apr-2025	10:03:59 AM	25	1284.00	CEUX
GENMAB A/S	16-Apr-2025	10:03:59 AM	32	1284.00	CEUX
GENMAB A/S	16-Apr-2025	10:03:59 AM	36	1284.00	AQEU
GENMAB A/S	16-Apr-2025	10:03:59 AM	5	1284.00	AQEU
GENMAB A/S	16-Apr-2025	10:04:00 AM	23	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:04:35 AM	25	1284.00	XCSE

148

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	10:04:48 AM	50	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:00 AM	35	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:00 AM	28	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:00 AM	38	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:00 AM	16	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:00 AM	14	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:00 AM	38	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:00 AM	25	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:36 AM	4	1283.00	AQEU
GENMAB A/S	16-Apr-2025	10:05:50 AM	90	1283.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:50 AM	38	1283.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:50 AM	15	1283.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:50 AM	37	1283.00	XCSE
GENMAB A/S	16-Apr-2025	10:05:50 AM	88	1282.50	XCSE
GENMAB A/S	16-Apr-2025	10:05:50 AM	42	1283.00	TQEX
GENMAB A/S	16-Apr-2025	10:05:50 AM	88	1283.00	CEUX
GENMAB A/S	16-Apr-2025	10:05:50 AM	36	1283.00	CEUX
GENMAB A/S	16-Apr-2025	10:05:50 AM	76	1282.00	CEUX
GENMAB A/S	16-Apr-2025	10:05:50 AM	23	1283.00	AQEU
GENMAB A/S	16-Apr-2025	10:09:34 AM	26	1282.00	TQEX
GENMAB A/S	16-Apr-2025	10:09:34 AM	36	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:09:34 AM	10	1282.00	CEUX
GENMAB A/S	16-Apr-2025	10:09:34 AM	21	1282.00	AQEU
GENMAB A/S	16-Apr-2025	10:09:37 AM	5	1282.00	TQEX
GENMAB A/S	16-Apr-2025	10:09:43 AM	9	1282.00	AQEU
GENMAB A/S	16-Apr-2025	10:11:21 AM	3	1282.00	XCSE
GENMAB A/S	16-Apr-2025	10:11:21 AM	29	1282.00	XCSE
GENMAB A/S	16-Apr-2025	10:11:21 AM	19	1282.00	XCSE
GENMAB A/S	16-Apr-2025	10:11:22 AM	20	1282.00	CEUX
GENMAB A/S	16-Apr-2025	10:12:15 AM	90	1281.50	XCSE
GENMAB A/S	16-Apr-2025	10:14:29 AM	45	1281.50	XCSE
GENMAB A/S	16-Apr-2025	10:14:29 AM	10	1281.50	XCSE
GENMAB A/S	16-Apr-2025	10:14:29 AM	37	1281.50	XCSE
GENMAB A/S	16-Apr-2025	10:14:29 AM	22	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:14:29 AM	68	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:14:29 AM	31	1281.00	TQEX
GENMAB A/S	16-Apr-2025	10:14:29 AM	86	1280.50	CEUX
GENMAB A/S	16-Apr-2025	10:14:29 AM	28	1281.00	AQEU
GENMAB A/S	16-Apr-2025	10:14:30 AM	43	1280.00	XCSE
GENMAB A/S	16-Apr-2025	10:14:30 AM	45	1280.00	XCSE
GENMAB A/S	16-Apr-2025	10:14:30 AM	29	1280.00	XCSE
GENMAB A/S	16-Apr-2025	10:14:30 AM	45	1280.00	XCSE
GENMAB A/S	16-Apr-2025	10:14:30 AM	8	1280.00	XCSE

149

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	10:14:30 AM	27	1279.50	TQEX
GENMAB A/S	16-Apr-2025	10:14:30 AM	36	1280.00	CEUX
GENMAB A/S	16-Apr-2025	10:14:30 AM	7	1280.00	CEUX
GENMAB A/S	16-Apr-2025	10:14:30 AM	7	1280.00	CEUX
GENMAB A/S	16-Apr-2025	10:14:30 AM	51	1280.00	CEUX
GENMAB A/S	16-Apr-2025	10:14:30 AM	88	1279.50	CEUX
GENMAB A/S	16-Apr-2025	10:14:30 AM	67	1279.50	CEUX
GENMAB A/S	16-Apr-2025	10:14:30 AM	29	1280.00	AQEU
GENMAB A/S	16-Apr-2025	10:14:53 AM	90	1280.00	XCSE
GENMAB A/S	16-Apr-2025	10:14:55 AM	92	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:14:55 AM	5	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:16:37 AM	45	1281.00	XCSE
GENMAB A/S	16-Apr-2025	10:16:37 AM	19	1281.00	XCSE
GENMAB A/S	16-Apr-2025	10:16:37 AM	37	1281.00	XCSE
GENMAB A/S	16-Apr-2025	10:16:37 AM	44	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:16:37 AM	30	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:16:37 AM	18	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:17:00 AM	26	1280.00	TQEX
GENMAB A/S	16-Apr-2025	10:17:00 AM	25	1280.00	CEUX
GENMAB A/S	16-Apr-2025	10:17:00 AM	36	1280.50	CEUX
GENMAB A/S	16-Apr-2025	10:17:00 AM	7	1280.50	CEUX
GENMAB A/S	16-Apr-2025	10:17:00 AM	6	1280.50	CEUX
GENMAB A/S	16-Apr-2025	10:17:00 AM	25	1279.50	CEUX
GENMAB A/S	16-Apr-2025	10:17:41 AM	89	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:17:41 AM	90	1278.00	XCSE
GENMAB A/S	16-Apr-2025	10:17:41 AM	35	1278.00	XCSE
GENMAB A/S	16-Apr-2025	10:17:41 AM	45	1278.00	XCSE
GENMAB A/S	16-Apr-2025	10:17:41 AM	26	1279.00	TQEX
GENMAB A/S	16-Apr-2025	10:17:41 AM	27	1278.00	TQEX
GENMAB A/S	16-Apr-2025	10:17:41 AM	87	1278.00	CEUX
GENMAB A/S	16-Apr-2025	10:17:41 AM	36	1278.00	CEUX
GENMAB A/S	16-Apr-2025	10:17:41 AM	34	1279.00	AQEU
GENMAB A/S	16-Apr-2025	10:17:41 AM	27	1278.00	AQEU
GENMAB A/S	16-Apr-2025	10:18:26 AM	90	1278.00	XCSE
GENMAB A/S	16-Apr-2025	10:18:26 AM	93	1278.00	CEUX
GENMAB A/S	16-Apr-2025	10:18:26 AM	26	1278.00	AQEU
GENMAB A/S	16-Apr-2025	10:18:27 AM	47	1278.00	XCSE
GENMAB A/S	16-Apr-2025	10:18:27 AM	18	1278.00	CEUX
GENMAB A/S	16-Apr-2025	10:18:27 AM	8	1278.00	CEUX
GENMAB A/S	16-Apr-2025	10:18:29 AM	100	1278.50	XCSE
GENMAB A/S	16-Apr-2025	10:18:29 AM	100	1278.50	XCSE
GENMAB A/S	16-Apr-2025	10:18:30 AM	100	1278.50	XCSE
GENMAB A/S	16-Apr-2025	10:18:30 AM	47	1278.50	XCSE

150

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	10:20:25 AM	12	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:25 AM	45	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:25 AM	11	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:25 AM	12	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:25 AM	37	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:25 AM	89	1278.00	CEUX
GENMAB A/S	16-Apr-2025	10:20:25 AM	33	1278.50	CEUX
GENMAB A/S	16-Apr-2025	10:20:25 AM	56	1278.50	CEUX
GENMAB A/S	16-Apr-2025	10:20:25 AM	30	1279.00	CEUX
GENMAB A/S	16-Apr-2025	10:20:25 AM	8	1279.00	CEUX
GENMAB A/S	16-Apr-2025	10:20:26 AM	63	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:26 AM	11	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:26 AM	43	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:26 AM	2	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:26 AM	11	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:26 AM	11	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:26 AM	13	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:26 AM	80	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:20:33 AM	3	1278.50	XCSE
GENMAB A/S	16-Apr-2025	10:21:57 AM	30	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:21:57 AM	87	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:21:58 AM	13	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:21:58 AM	100	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:21:58 AM	21	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:21:58 AM	31	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:21:58 AM	36	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:22:47 AM	87	1279.00	XCSE
GENMAB A/S	16-Apr-2025	10:22:47 AM	51	1279.00	AQEU
GENMAB A/S	16-Apr-2025	10:22:48 AM	32	1279.00	CEUX
GENMAB A/S	16-Apr-2025	10:24:16 AM	14	1281.00	CEUX
GENMAB A/S	16-Apr-2025	10:24:17 AM	36	1281.00	CEUX
GENMAB A/S	16-Apr-2025	10:24:21 AM	32	1281.00	CEUX
GENMAB A/S	16-Apr-2025	10:25:15 AM	91	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:25:15 AM	45	1281.00	XCSE
GENMAB A/S	16-Apr-2025	10:25:15 AM	19	1281.00	XCSE
GENMAB A/S	16-Apr-2025	10:25:15 AM	88	1280.50	CEUX
GENMAB A/S	16-Apr-2025	10:27:30 AM	93	1282.50	XCSE
GENMAB A/S	16-Apr-2025	10:27:31 AM	18	1283.50	CEUX
GENMAB A/S	16-Apr-2025	10:27:32 AM	37	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:27:32 AM	54	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:27:34 AM	35	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:27:34 AM	23	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:27:34 AM	25	1284.50	CEUX

151

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	10:27:35 AM	66	1284.50	CEUX
GENMAB A/S	16-Apr-2025	10:27:35 AM	2	1284.50	CEUX
GENMAB A/S	16-Apr-2025	10:27:39 AM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:27:39 AM	23	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:00 AM	86	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:00 AM	35	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:00 AM	45	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:00 AM	24	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:00 AM	13	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	35	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	45	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	18	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	19	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	91	1288.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	45	1288.50	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	56	1288.50	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	15	1288.50	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	1	1288.50	XCSE
GENMAB A/S	16-Apr-2025	10:28:01 AM	91	1288.00	CEUX
GENMAB A/S	16-Apr-2025	10:28:01 AM	50	1288.00	AQEU
GENMAB A/S	16-Apr-2025	10:28:02 AM	45	1288.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:02 AM	24	1288.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:02 AM	13	1288.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:08 AM	91	1288.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:10 AM	92	1287.50	CEUX
GENMAB A/S	16-Apr-2025	10:28:14 AM	90	1287.50	XCSE
GENMAB A/S	16-Apr-2025	10:28:17 AM	30	1286.50	CEUX
GENMAB A/S	16-Apr-2025	10:28:18 AM	86	1286.50	XCSE
GENMAB A/S	16-Apr-2025	10:28:18 AM	42	1286.50	TQEX
GENMAB A/S	16-Apr-2025	10:28:18 AM	24	1286.50	CEUX
GENMAB A/S	16-Apr-2025	10:28:18 AM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	10:28:54 AM	14	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:55 AM	36	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:28:56 AM	37	1289.00	XCSE
GENMAB A/S	16-Apr-2025	10:29:04 AM	87	1290.50	XCSE
GENMAB A/S	16-Apr-2025	10:29:11 AM	67	1291.50	CEUX
GENMAB A/S	16-Apr-2025	10:29:18 AM	75	1292.00	XCSE
GENMAB A/S	16-Apr-2025	10:29:18 AM	44	1292.00	AQEU
GENMAB A/S	16-Apr-2025	10:29:20 AM	31	1292.00	TQEX
GENMAB A/S	16-Apr-2025	10:29:23 AM	8	1291.00	XCSE
GENMAB A/S	16-Apr-2025	10:29:23 AM	25	1291.00	XCSE
GENMAB A/S	16-Apr-2025	10:29:23 AM	27	1291.00	TQEX
GENMAB A/S	16-Apr-2025	10:29:23 AM	21	1291.50	CEUX

152

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	10:29:23 AM	25	1290.50	CEUX
GENMAB A/S	16-Apr-2025	10:29:23 AM	44	1291.00	AQEU
GENMAB A/S	16-Apr-2025	10:29:24 AM	62	1290.50	CEUX
GENMAB A/S	16-Apr-2025	10:29:30 AM	87	1289.50	XCSE
GENMAB A/S	16-Apr-2025	10:29:30 AM	42	1289.50	CEUX
GENMAB A/S	16-Apr-2025	10:29:30 AM	47	1289.50	CEUX
GENMAB A/S	16-Apr-2025	10:29:53 AM	26	1286.50	XCSE
GENMAB A/S	16-Apr-2025	10:30:20 AM	29	1288.50	XCSE
GENMAB A/S	16-Apr-2025	10:30:55 AM	34	1288.00	CEUX
GENMAB A/S	16-Apr-2025	10:31:06 AM	30	1287.50	XCSE
GENMAB A/S	16-Apr-2025	10:31:06 AM	29	1287.00	CEUX
GENMAB A/S	16-Apr-2025	10:31:25 AM	26	1286.50	XCSE
GENMAB A/S	16-Apr-2025	10:31:25 AM	28	1286.50	TQEX
GENMAB A/S	16-Apr-2025	10:31:28 AM	30	1286.00	CEUX
GENMAB A/S	16-Apr-2025	10:31:29 AM	19	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:31:29 AM	11	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:33:56 AM	28	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:33:56 AM	21	1283.50	CEUX
GENMAB A/S	16-Apr-2025	10:33:59 AM	7	1283.50	CEUX
GENMAB A/S	16-Apr-2025	10:34:23 AM	88	1283.50	XCSE
GENMAB A/S	16-Apr-2025	10:34:40 AM	30	1283.00	TQEX
GENMAB A/S	16-Apr-2025	10:34:40 AM	35	1283.00	AQEU
GENMAB A/S	16-Apr-2025	10:35:34 AM	31	1282.50	XCSE
GENMAB A/S	16-Apr-2025	10:35:34 AM	22	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:35:34 AM	6	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:35:43 AM	26	1281.50	CEUX
GENMAB A/S	16-Apr-2025	10:35:49 AM	3	1281.50	CEUX
GENMAB A/S	16-Apr-2025	10:36:57 AM	32	1281.50	AQEU
GENMAB A/S	16-Apr-2025	10:37:31 AM	1	1281.00	XCSE
GENMAB A/S	16-Apr-2025	10:37:31 AM	56	1281.00	XCSE
GENMAB A/S	16-Apr-2025	10:38:00 AM	52	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:38:27 AM	41	1280.50	XCSE
GENMAB A/S	16-Apr-2025	10:41:18 AM	11	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:42:13 AM	86	1285.00	CEUX
GENMAB A/S	16-Apr-2025	10:42:13 AM	26	1285.00	AQEU
GENMAB A/S	16-Apr-2025	10:44:00 AM	27	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:44:00 AM	91	1285.00	CEUX
GENMAB A/S	16-Apr-2025	10:44:01 AM	12	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:44:01 AM	14	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:44:07 AM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:44:07 AM	17	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:44:07 AM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:45:05 AM	39	1285.00	XCSE

153

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	10:45:05 AM	28	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:45:05 AM	37	1285.00	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	91	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	27	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	35	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	39	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	16	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	74	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	37	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	5	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	1	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:47:40 AM	27	1284.00	TQEX
GENMAB A/S	16-Apr-2025	10:47:40 AM	87	1284.00	CEUX
GENMAB A/S	16-Apr-2025	10:47:40 AM	4	1284.00	CEUX
GENMAB A/S	16-Apr-2025	10:47:40 AM	28	1284.00	AQEU
GENMAB A/S	16-Apr-2025	10:47:56 AM	70	1284.00	XCSE
GENMAB A/S	16-Apr-2025	10:51:09 AM	26	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:09 AM	39	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:09 AM	14	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:12 AM	14	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:12 AM	11	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:15 AM	37	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:15 AM	39	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:25 AM	39	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:25 AM	37	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:46 AM	13	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:46 AM	2	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:51:56 AM	13	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:52:06 AM	39	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:52:06 AM	21	1284.50	XCSE
GENMAB A/S	16-Apr-2025	10:52:28 AM	38	1284.00	TQEX
GENMAB A/S	16-Apr-2025	10:52:28 AM	36	1284.00	CEUX
GENMAB A/S	16-Apr-2025	10:52:28 AM	29	1284.00	AQEU
GENMAB A/S	16-Apr-2025	10:52:39 AM	91	1283.50	XCSE
GENMAB A/S	16-Apr-2025	10:52:39 AM	36	1283.50	CEUX
GENMAB A/S	16-Apr-2025	10:53:51 AM	15	1283.50	CEUX
GENMAB A/S	16-Apr-2025	10:53:51 AM	36	1284.00	CEUX
GENMAB A/S	16-Apr-2025	10:53:53 AM	92	1282.50	XCSE
GENMAB A/S	16-Apr-2025	10:53:53 AM	26	1283.00	TQEX
GENMAB A/S	16-Apr-2025	10:53:53 AM	93	1283.00	CEUX
GENMAB A/S	16-Apr-2025	10:53:53 AM	26	1283.00	AQEU
GENMAB A/S	16-Apr-2025	10:54:25 AM	26	1282.00	TQEX
GENMAB A/S	16-Apr-2025	10:54:25 AM	78	1281.50	CEUX

154

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	10:57:15 AM	9	1281.50	CEUX
GENMAB A/S	16-Apr-2025	10:57:50 AM	89	1283.00	XCSE
GENMAB A/S	16-Apr-2025	10:57:50 AM	39	1283.50	XCSE
GENMAB A/S	16-Apr-2025	10:57:50 AM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	10:57:50 AM	13	1283.50	XCSE
GENMAB A/S	16-Apr-2025	10:57:50 AM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	10:58:08 AM	4	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:59:02 AM	32	1282.50	CEUX
GENMAB A/S	16-Apr-2025	10:59:10 AM	26	1282.50	AQEU
GENMAB A/S	16-Apr-2025	10:59:10 AM	28	1282.50	TQEX
GENMAB A/S	16-Apr-2025	10:59:10 AM	51	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:00:55 AM	13	1282.00	XCSE
GENMAB A/S	16-Apr-2025	11:00:55 AM	13	1282.00	XCSE
GENMAB A/S	16-Apr-2025	11:00:55 AM	2	1281.50	TQEX
GENMAB A/S	16-Apr-2025	11:01:15 AM	89	1281.50	XCSE
GENMAB A/S	16-Apr-2025	11:01:15 AM	29	1281.50	TQEX
GENMAB A/S	16-Apr-2025	11:01:15 AM	88	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:01:21 AM	27	1281.50	AQEU
GENMAB A/S	16-Apr-2025	11:04:05 AM	88	1281.50	XCSE
GENMAB A/S	16-Apr-2025	11:04:05 AM	89	1281.50	CEUX
GENMAB A/S	16-Apr-2025	11:05:01 AM	25	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:05:01 AM	3	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:05:01 AM	12	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:05:30 AM	11	1282.50	XCSE
GENMAB A/S	16-Apr-2025	11:05:30 AM	40	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:05:30 AM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:05:30 AM	27	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:05:35 AM	92	1282.00	CEUX
GENMAB A/S	16-Apr-2025	11:08:05 AM	13	1281.50	TQEX
GENMAB A/S	16-Apr-2025	11:08:05 AM	16	1281.50	TQEX
GENMAB A/S	16-Apr-2025	11:08:05 AM	74	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:11:29 AM	34	1283.50	TQEX
GENMAB A/S	16-Apr-2025	11:11:29 AM	1	1283.50	CEUX
GENMAB A/S	16-Apr-2025	11:11:29 AM	89	1283.50	CEUX
GENMAB A/S	16-Apr-2025	11:11:41 AM	1	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:11:51 AM	12	1283.50	CEUX
GENMAB A/S	16-Apr-2025	11:11:51 AM	14	1283.50	CEUX
GENMAB A/S	16-Apr-2025	11:11:52 AM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:11:53 AM	13	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:11:54 AM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:11:55 AM	12	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:11:56 AM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:13:15 AM	88	1283.00	XCSE

155

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	11:13:15 AM	40	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:13:15 AM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:13:15 AM	38	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:13:15 AM	35	1283.00	AQEU
GENMAB A/S	16-Apr-2025	11:13:15 AM	33	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:13:15 AM	7	1283.00	CEUX
GENMAB A/S	16-Apr-2025	11:13:21 AM	9	1283.00	CEUX
GENMAB A/S	16-Apr-2025	11:13:21 AM	3	1283.00	CEUX
GENMAB A/S	16-Apr-2025	11:13:22 AM	12	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:13:38 AM	15	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:13:38 AM	11	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:16:22 AM	45	1283.50	XCSE
GENMAB A/S	16-Apr-2025	11:16:22 AM	36	1283.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:15 AM	91	1283.00	XCSE
GENMAB A/S	16-Apr-2025	11:17:15 AM	26	1283.00	AQEU
GENMAB A/S	16-Apr-2025	11:17:15 AM	36	1282.50	TQEX
GENMAB A/S	16-Apr-2025	11:17:15 AM	60	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:15 AM	36	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:15 AM	7	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:15 AM	7	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:15 AM	7	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:15 AM	7	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:15 AM	12	1282.50	CEUX
GENMAB A/S	16-Apr-2025	11:17:17 AM	88	1282.00	XCSE
GENMAB A/S	16-Apr-2025	11:17:17 AM	36	1282.00	AQEU
GENMAB A/S	16-Apr-2025	11:19:05 AM	26	1281.50	TQEX
GENMAB A/S	16-Apr-2025	11:19:05 AM	12	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:19:36 AM	88	1281.00	XCSE
GENMAB A/S	16-Apr-2025	11:19:36 AM	26	1281.00	AQEU
GENMAB A/S	16-Apr-2025	11:19:36 AM	15	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:19:36 AM	7	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:19:37 AM	6	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:20:17 AM	9	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:20:17 AM	18	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:20:17 AM	7	1281.00	CEUX
GENMAB A/S	16-Apr-2025	11:20:18 AM	6	1280.50	CEUX
GENMAB A/S	16-Apr-2025	11:20:18 AM	6	1280.50	CEUX
GENMAB A/S	16-Apr-2025	11:20:18 AM	7	1280.50	CEUX
GENMAB A/S	16-Apr-2025	11:21:05 AM	89	1279.50	XCSE
GENMAB A/S	16-Apr-2025	11:21:05 AM	30	1280.00	AQEU
GENMAB A/S	16-Apr-2025	11:21:05 AM	32	1280.00	TQEX
GENMAB A/S	16-Apr-2025	11:21:05 AM	90	1279.50	CEUX
GENMAB A/S	16-Apr-2025	11:23:15 AM	26	1279.00	TQEX

156

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	11:23:55 AM	75	1278.00	CEUX
GENMAB A/S	16-Apr-2025	11:24:11 AM	10	1278.50	CEUX
GENMAB A/S	16-Apr-2025	11:25:43 AM	92	1278.00	XCSE
GENMAB A/S	16-Apr-2025	11:25:43 AM	29	1278.00	TQEX
GENMAB A/S	16-Apr-2025	11:25:43 AM	36	1278.50	CEUX
GENMAB A/S	16-Apr-2025	11:25:43 AM	17	1278.00	CEUX
GENMAB A/S	16-Apr-2025	11:25:44 AM	13	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:25:44 AM	27	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:25:44 AM	12	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:25:45 AM	12	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:26:07 AM	93	1280.00	CEUX
GENMAB A/S	16-Apr-2025	11:29:12 AM	86	1280.00	XCSE
GENMAB A/S	16-Apr-2025	11:30:13 AM	90	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:30:13 AM	35	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:30:13 AM	27	1278.50	AQEU
GENMAB A/S	16-Apr-2025	11:30:13 AM	27	1278.50	TQEX
GENMAB A/S	16-Apr-2025	11:30:13 AM	57	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:30:13 AM	35	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:31:05 AM	62	1278.00	CEUX
GENMAB A/S	16-Apr-2025	11:32:05 AM	91	1278.00	XCSE
GENMAB A/S	16-Apr-2025	11:32:05 AM	25	1278.00	CEUX
GENMAB A/S	16-Apr-2025	11:32:53 AM	93	1278.00	XCSE
GENMAB A/S	16-Apr-2025	11:32:53 AM	27	1278.00	TQEX
GENMAB A/S	16-Apr-2025	11:32:53 AM	91	1278.00	CEUX
GENMAB A/S	16-Apr-2025	11:36:03 AM	26	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:36:03 AM	36	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:37:35 AM	64	1278.50	CEUX
GENMAB A/S	16-Apr-2025	11:39:15 AM	92	1279.50	XCSE
GENMAB A/S	16-Apr-2025	11:39:27 AM	27	1279.50	XCSE
GENMAB A/S	16-Apr-2025	11:41:15 AM	25	1278.50	CEUX
GENMAB A/S	16-Apr-2025	11:41:42 AM	27	1279.00	TQEX
GENMAB A/S	16-Apr-2025	11:42:55 AM	87	1278.50	XCSE
GENMAB A/S	16-Apr-2025	11:42:55 AM	27	1278.00	TQEX
GENMAB A/S	16-Apr-2025	11:42:55 AM	26	1278.50	AQEU
GENMAB A/S	16-Apr-2025	11:42:55 AM	7	1278.50	AQEU
GENMAB A/S	16-Apr-2025	11:43:55 AM	88	1277.50	CEUX
GENMAB A/S	16-Apr-2025	11:46:42 AM	21	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:46:42 AM	39	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:46:52 AM	14	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:46:52 AM	12	1279.00	XCSE
GENMAB A/S	16-Apr-2025	11:47:15 AM	92	1278.50	XCSE
GENMAB A/S	16-Apr-2025	11:48:45 AM	66	1278.00	CEUX
GENMAB A/S	16-Apr-2025	11:49:55 AM	25	1278.00	CEUX

157

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	11:55:00 AM	9	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:55:01 AM	36	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:55:02 AM	36	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:55:06 AM	14	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:56:35 AM	35	1279.00	TQEX
GENMAB A/S	16-Apr-2025	11:56:35 AM	90	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:56:45 AM	12	1279.00	TQEX
GENMAB A/S	16-Apr-2025	11:56:45 AM	36	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:56:53 AM	13	1279.00	CEUX
GENMAB A/S	16-Apr-2025	11:57:56 AM	67	1278.50	XCSE
GENMAB A/S	16-Apr-2025	11:59:25 AM	26	1278.50	XCSE
GENMAB A/S	16-Apr-2025	11:59:25 AM	26	1278.00	TQEX
GENMAB A/S	16-Apr-2025	11:59:25 AM	74	1278.50	AQEU
GENMAB A/S	16-Apr-2025	11:59:25 AM	18	1278.50	CEUX
GENMAB A/S	16-Apr-2025	11:59:25 AM	50	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:00:19 PM	21	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:00:19 PM	2	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:00:19 PM	20	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:02:19 PM	12	1280.00	CEUX
GENMAB A/S	16-Apr-2025	12:04:35 PM	56	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:07:15 PM	86	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:07:15 PM	35	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:10:25 PM	32	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:10:25 PM	16	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:10:25 PM	25	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:10:25 PM	26	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:10:25 PM	14	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:10:29 PM	25	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:10:29 PM	20	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:12:15 PM	13	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:12:15 PM	13	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:12:15 PM	9	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:12:15 PM	12	1279.00	TQEX
GENMAB A/S	16-Apr-2025	12:12:15 PM	25	1279.00	TQEX
GENMAB A/S	16-Apr-2025	12:12:15 PM	89	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:12:26 PM	54	1279.00	AQEU
GENMAB A/S	16-Apr-2025	12:12:26 PM	10	1279.00	CEUX
GENMAB A/S	16-Apr-2025	12:14:57 PM	11	1278.50	XCSE
GENMAB A/S	16-Apr-2025	12:15:09 PM	81	1278.50	XCSE
GENMAB A/S	16-Apr-2025	12:15:09 PM	26	1278.50	XCSE
GENMAB A/S	16-Apr-2025	12:15:09 PM	20	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:15:43 PM	9	1278.50	XCSE
GENMAB A/S	16-Apr-2025	12:15:43 PM	15	1278.50	XCSE

158

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	12:15:43 PM	2	1278.50	XCSE
GENMAB A/S	16-Apr-2025	12:15:43 PM	17	1278.00	TQEX
GENMAB A/S	16-Apr-2025	12:15:43 PM	19	1278.00	TQEX
GENMAB A/S	16-Apr-2025	12:15:43 PM	45	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:15:43 PM	7	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:17:45 PM	92	1277.50	XCSE
GENMAB A/S	16-Apr-2025	12:17:45 PM	2	1277.50	AQEU
GENMAB A/S	16-Apr-2025	12:17:45 PM	57	1277.50	CEUX
GENMAB A/S	16-Apr-2025	12:17:45 PM	2	1277.50	CEUX
GENMAB A/S	16-Apr-2025	12:18:27 PM	29	1277.50	CEUX
GENMAB A/S	16-Apr-2025	12:19:00 PM	86	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:19:00 PM	47	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:19:07 PM	100	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:19:13 PM	90	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:20:22 PM	53	1279.00	TQEX
GENMAB A/S	16-Apr-2025	12:20:22 PM	36	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:20:22 PM	33	1279.00	CEUX
GENMAB A/S	16-Apr-2025	12:20:22 PM	54	1279.00	CEUX
GENMAB A/S	16-Apr-2025	12:20:22 PM	10	1279.00	CEUX
GENMAB A/S	16-Apr-2025	12:22:45 PM	89	1278.50	XCSE
GENMAB A/S	16-Apr-2025	12:22:45 PM	71	1278.50	AQEU
GENMAB A/S	16-Apr-2025	12:22:45 PM	69	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:24:43 PM	19	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:25:45 PM	21	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:27:29 PM	58	1278.00	TQEX
GENMAB A/S	16-Apr-2025	12:27:29 PM	10	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:27:30 PM	15	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:27:32 PM	2	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:27:59 PM	17	1278.00	XCSE
GENMAB A/S	16-Apr-2025	12:27:59 PM	74	1278.00	XCSE
GENMAB A/S	16-Apr-2025	12:29:25 PM	87	1278.00	XCSE
GENMAB A/S	16-Apr-2025	12:29:25 PM	34	1278.00	TQEX
GENMAB A/S	16-Apr-2025	12:29:25 PM	91	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:30:55 PM	14	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:34:25 PM	14	1278.50	XCSE
GENMAB A/S	16-Apr-2025	12:34:25 PM	79	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:35:03 PM	20	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:35:14 PM	15	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	15	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	37	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	13	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	37	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	15	1279.00	XCSE

159

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	12:35:14 PM	14	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	16	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	37	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:35:14 PM	12	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:37:01 PM	13	1278.00	XCSE
GENMAB A/S	16-Apr-2025	12:37:01 PM	80	1278.00	XCSE
GENMAB A/S	16-Apr-2025	12:37:01 PM	31	1278.00	TQEX
GENMAB A/S	16-Apr-2025	12:37:01 PM	26	1277.50	AQEU
GENMAB A/S	16-Apr-2025	12:37:01 PM	8	1278.00	CEUX
GENMAB A/S	16-Apr-2025	12:37:01 PM	68	1277.00	CEUX
GENMAB A/S	16-Apr-2025	12:39:15 PM	89	1277.00	XCSE
GENMAB A/S	16-Apr-2025	12:39:15 PM	10	1277.00	TQEX
GENMAB A/S	16-Apr-2025	12:39:15 PM	10	1277.00	TQEX
GENMAB A/S	16-Apr-2025	12:39:15 PM	7	1277.00	TQEX
GENMAB A/S	16-Apr-2025	12:39:15 PM	25	1277.00	CEUX
GENMAB A/S	16-Apr-2025	12:42:35 PM	35	1277.00	XCSE
GENMAB A/S	16-Apr-2025	12:42:35 PM	65	1276.00	CEUX
GENMAB A/S	16-Apr-2025	12:43:13 PM	24	1276.50	AQEU
GENMAB A/S	16-Apr-2025	12:43:26 PM	3	1276.50	AQEU
GENMAB A/S	16-Apr-2025	12:45:45 PM	87	1276.00	XCSE
GENMAB A/S	16-Apr-2025	12:45:45 PM	22	1276.00	TQEX
GENMAB A/S	16-Apr-2025	12:45:45 PM	26	1276.00	CEUX
GENMAB A/S	16-Apr-2025	12:47:31 PM	93	1276.50	XCSE
GENMAB A/S	16-Apr-2025	12:47:31 PM	24	1276.50	CEUX
GENMAB A/S	16-Apr-2025	12:47:38 PM	2	1277.00	CEUX
GENMAB A/S	16-Apr-2025	12:47:38 PM	66	1276.50	CEUX
GENMAB A/S	16-Apr-2025	12:47:42 PM	36	1277.50	CEUX
GENMAB A/S	16-Apr-2025	12:53:21 PM	9	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:53:21 PM	31	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:53:35 PM	25	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:53:35 PM	19	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:53:56 PM	13	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:54:00 PM	36	1280.00	CEUX
GENMAB A/S	16-Apr-2025	12:54:01 PM	36	1280.00	CEUX
GENMAB A/S	16-Apr-2025	12:54:08 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:54:08 PM	56	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:54:08 PM	34	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:54:08 PM	36	1280.00	CEUX
GENMAB A/S	16-Apr-2025	12:54:47 PM	15	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:54:47 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:54:47 PM	15	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:54:47 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:54:47 PM	13	1280.00	XCSE

160

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	12:55:24 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:55:24 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:55:24 PM	2	1280.00	XCSE
GENMAB A/S	16-Apr-2025	12:55:24 PM	17	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:55:45 PM	63	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:55:45 PM	7	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:57:04 PM	31	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:57:04 PM	36	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:57:04 PM	17	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:57:10 PM	36	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:57:15 PM	2	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:57:36 PM	86	1279.00	XCSE
GENMAB A/S	16-Apr-2025	12:57:36 PM	44	1279.50	XCSE
GENMAB A/S	16-Apr-2025	12:57:36 PM	36	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:57:36 PM	49	1279.50	CEUX
GENMAB A/S	16-Apr-2025	12:58:40 PM	49	1278.50	TQEX
GENMAB A/S	16-Apr-2025	12:58:40 PM	87	1278.50	AQEU
GENMAB A/S	16-Apr-2025	12:58:40 PM	93	1278.50	CEUX
GENMAB A/S	16-Apr-2025	12:58:40 PM	36	1278.50	CEUX
GENMAB A/S	16-Apr-2025	1:01:55 PM	65	1278.50	CEUX
GENMAB A/S	16-Apr-2025	1:01:55 PM	24	1278.50	CEUX
GENMAB A/S	16-Apr-2025	1:03:25 PM	86	1278.50	XCSE
GENMAB A/S	16-Apr-2025	1:03:25 PM	48	1278.50	TQEX
GENMAB A/S	16-Apr-2025	1:03:29 PM	2	1278.50	AQEU
GENMAB A/S	16-Apr-2025	1:03:42 PM	73	1278.50	AQEU
GENMAB A/S	16-Apr-2025	1:04:05 PM	15	1278.50	CEUX
GENMAB A/S	16-Apr-2025	1:06:41 PM	31	1280.50	XCSE
GENMAB A/S	16-Apr-2025	1:06:41 PM	29	1280.50	XCSE
GENMAB A/S	16-Apr-2025	1:08:09 PM	39	1281.50	XCSE
GENMAB A/S	16-Apr-2025	1:08:09 PM	25	1281.50	XCSE
GENMAB A/S	16-Apr-2025	1:08:09 PM	27	1281.50	XCSE
GENMAB A/S	16-Apr-2025	1:10:45 PM	48	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:10:45 PM	43	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:12:20 PM	31	1281.50	XCSE
GENMAB A/S	16-Apr-2025	1:12:20 PM	36	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:12:21 PM	7	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:12:21 PM	51	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:12:21 PM	17	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:12:29 PM	31	1281.50	XCSE
GENMAB A/S	16-Apr-2025	1:12:29 PM	2	1281.50	XCSE
GENMAB A/S	16-Apr-2025	1:13:33 PM	36	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:13:34 PM	31	1281.50	XCSE
GENMAB A/S	16-Apr-2025	1:13:34 PM	50	1281.50	CEUX

161

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	1:13:41 PM	36	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:17:25 PM	39	1282.00	XCSE
GENMAB A/S	16-Apr-2025	1:17:25 PM	28	1282.00	XCSE
GENMAB A/S	16-Apr-2025	1:17:25 PM	15	1282.00	XCSE
GENMAB A/S	16-Apr-2025	1:17:25 PM	69	1281.50	CEUX
GENMAB A/S	16-Apr-2025	1:20:34 PM	92	1282.50	CEUX
GENMAB A/S	16-Apr-2025	1:20:34 PM	15	1282.50	CEUX
GENMAB A/S	16-Apr-2025	1:25:05 PM	90	1282.00	XCSE
GENMAB A/S	16-Apr-2025	1:25:05 PM	39	1282.50	XCSE
GENMAB A/S	16-Apr-2025	1:25:05 PM	29	1282.50	XCSE
GENMAB A/S	16-Apr-2025	1:25:05 PM	29	1282.50	XCSE
GENMAB A/S	16-Apr-2025	1:25:05 PM	20	1282.50	XCSE
GENMAB A/S	16-Apr-2025	1:25:05 PM	69	1282.00	TQEX
GENMAB A/S	16-Apr-2025	1:27:42 PM	50	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:27:42 PM	6	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:27:42 PM	18	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:29:02 PM	2	1283.00	AQEU
GENMAB A/S	16-Apr-2025	1:31:05 PM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:31:05 PM	85	1283.00	AQEU
GENMAB A/S	16-Apr-2025	1:32:21 PM	35	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:32:21 PM	28	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:32:21 PM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:32:21 PM	36	1283.00	CEUX
GENMAB A/S	16-Apr-2025	1:33:00 PM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:33:00 PM	12	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:33:00 PM	36	1283.00	CEUX
GENMAB A/S	16-Apr-2025	1:33:00 PM	77	1282.50	CEUX
GENMAB A/S	16-Apr-2025	1:33:01 PM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:33:05 PM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:33:05 PM	35	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:33:05 PM	39	1283.00	XCSE
GENMAB A/S	16-Apr-2025	1:33:05 PM	9	1282.50	CEUX
GENMAB A/S	16-Apr-2025	1:33:09 PM	14	1282.00	AQEU
GENMAB A/S	16-Apr-2025	1:33:11 PM	99	1282.50	CEUX
GENMAB A/S	16-Apr-2025	1:33:21 PM	68	1282.50	CEUX
GENMAB A/S	16-Apr-2025	1:33:43 PM	39	1283.50	XCSE
GENMAB A/S	16-Apr-2025	1:33:43 PM	16	1283.50	XCSE
GENMAB A/S	16-Apr-2025	1:33:43 PM	16	1283.50	XCSE
GENMAB A/S	16-Apr-2025	1:33:44 PM	36	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:36:06 PM	93	1283.50	XCSE
GENMAB A/S	16-Apr-2025	1:36:06 PM	29	1283.50	XCSE
GENMAB A/S	16-Apr-2025	1:36:06 PM	77	1283.50	TQEX
GENMAB A/S	16-Apr-2025	1:36:06 PM	93	1283.50	CEUX

162

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	1:36:06 PM	36	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:36:12 PM	8	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:38:25 PM	89	1283.50	XCSE
GENMAB A/S	16-Apr-2025	1:38:25 PM	80	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:38:25 PM	10	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:38:25 PM	23	1283.50	CEUX
GENMAB A/S	16-Apr-2025	1:38:26 PM	47	1283.50	XCSE
GENMAB A/S	16-Apr-2025	1:42:55 PM	92	1284.00	XCSE
GENMAB A/S	16-Apr-2025	1:45:12 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:45:17 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:45:35 PM	13	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:45:37 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:45:56 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:46:04 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:46:47 PM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:46:47 PM	37	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:46:47 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:47:00 PM	2	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:47:00 PM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:47:00 PM	37	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:47:45 PM	37	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:47:45 PM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:47:55 PM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:47:55 PM	37	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:47:55 PM	33	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:48:01 PM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:48:01 PM	2	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:48:29 PM	2	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:48:29 PM	17	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:48:34 PM	14	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:48:37 PM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:48:37 PM	37	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:48:37 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:49:00 PM	39	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:49:00 PM	37	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:49:00 PM	41	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:50:00 PM	31	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:50:04 PM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:50:04 PM	42	1285.00	XCSE
GENMAB A/S	16-Apr-2025	1:51:32 PM	88	1285.50	XCSE
GENMAB A/S	16-Apr-2025	1:53:43 PM	71	1285.00	TQEX
GENMAB A/S	16-Apr-2025	1:53:43 PM	90	1285.00	CEUX
GENMAB A/S	16-Apr-2025	1:53:49 PM	15	1285.50	CEUX

163

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	1:53:55 PM	15	1285.50	CEUX
GENMAB A/S	16-Apr-2025	1:53:56 PM	12	1285.50	CEUX
GENMAB A/S	16-Apr-2025	1:54:25 PM	15	1285.50	CEUX
GENMAB A/S	16-Apr-2025	1:55:39 PM	39	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:39 PM	15	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:39 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:39 PM	26	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:40 PM	91	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:40 PM	2	1286.50	AQEU
GENMAB A/S	16-Apr-2025	1:55:40 PM	22	1286.50	AQEU
GENMAB A/S	16-Apr-2025	1:55:40 PM	90	1286.50	CEUX
GENMAB A/S	16-Apr-2025	1:55:45 PM	35	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:45 PM	15	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:45 PM	39	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:45 PM	24	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:45 PM	4	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:45 PM	24	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:45 PM	45	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:55:45 PM	15	1286.50	AQEU
GENMAB A/S	16-Apr-2025	1:55:45 PM	49	1286.50	AQEU
GENMAB A/S	16-Apr-2025	1:55:45 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	1:56:01 PM	26	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:56:01 PM	39	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:56:01 PM	11	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:56:01 PM	26	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:56:01 PM	67	1286.00	TQEX
GENMAB A/S	16-Apr-2025	1:56:01 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	1:56:13 PM	35	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:56:13 PM	26	1286.50	XCSE
GENMAB A/S	16-Apr-2025	1:56:13 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	1:56:13 PM	51	1286.50	CEUX
GENMAB A/S	16-Apr-2025	1:58:35 PM	10	1286.00	TQEX
GENMAB A/S	16-Apr-2025	2:04:25 PM	86	1286.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:03 PM	91	1286.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:03 PM	2	1286.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:03 PM	73	1286.50	TQEX
GENMAB A/S	16-Apr-2025	2:06:03 PM	61	1286.00	TQEX
GENMAB A/S	16-Apr-2025	2:06:03 PM	93	1286.50	AQEU
GENMAB A/S	16-Apr-2025	2:06:03 PM	30	1287.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:03 PM	5	1286.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:04 PM	44	1286.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:04 PM	16	1286.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:05 PM	17	1286.50	CEUX

164

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:06:05 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:06 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:14 PM	15	1286.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	92	1285.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	91	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	92	1283.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	88	1281.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	35	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	13	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	31	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	9	1282.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	35	1281.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	35	1281.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	17	1281.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	14	1281.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	13	1281.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	3	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	2	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	10	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	77	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	87	1279.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	8	1277.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	2	1277.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	79	1277.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:27 PM	48	1286.00	TQEX
GENMAB A/S	16-Apr-2025	2:06:27 PM	20	1285.00	TQEX
GENMAB A/S	16-Apr-2025	2:06:27 PM	75	1284.00	TQEX
GENMAB A/S	16-Apr-2025	2:06:27 PM	90	1285.50	AQEU
GENMAB A/S	16-Apr-2025	2:06:27 PM	89	1284.50	AQEU
GENMAB A/S	16-Apr-2025	2:06:27 PM	86	1283.50	AQEU
GENMAB A/S	16-Apr-2025	2:06:27 PM	28	1284.50	AQEU
GENMAB A/S	16-Apr-2025	2:06:27 PM	93	1285.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	87	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	89	1283.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	36	1285.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	21	1286.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	7	1286.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	50	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	8	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	31	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	93	1283.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	93	1281.50	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	28	1280.00	CEUX

165

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:06:27 PM	27	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	17	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	18	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:27 PM	3	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:28 PM	117	1279.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:29 PM	91	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:30 PM	89	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:30 PM	35	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:30 PM	44	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:30 PM	15	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:30 PM	23	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:30 PM	41	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:30 PM	52	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:31 PM	35	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:32 PM	13	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:32 PM	13	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:32 PM	39	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:32 PM	31	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:32 PM	39	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:32 PM	36	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:06:32 PM	93	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:33 PM	89	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:33 PM	35	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:33 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:33 PM	43	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:33 PM	88	1280.00	CEUX
GENMAB A/S	16-Apr-2025	2:06:47 PM	100	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:06:47 PM	17	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:07:05 PM	15	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:07:05 PM	36	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:07:06 PM	13	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:07:06 PM	37	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:07:29 PM	25	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:07:29 PM	15	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:03 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:04 PM	3	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:04 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:06 PM	2	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:06 PM	39	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:06 PM	14	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:06 PM	14	1280.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:06 PM	93	1279.00	XCSE
GENMAB A/S	16-Apr-2025	2:08:06 PM	11	1279.00	CEUX

166

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:08:06 PM	21	1279.00	CEUX
GENMAB A/S	16-Apr-2025	2:08:57 PM	6	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:08:57 PM	80	1280.50	XCSE
GENMAB A/S	16-Apr-2025	2:10:12 PM	91	1283.50	XCSE
GENMAB A/S	16-Apr-2025	2:11:01 PM	35	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:26 PM	25	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:26 PM	35	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:35 PM	17	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:35 PM	25	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:35 PM	35	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:35 PM	39	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:35 PM	14	1283.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:35 PM	26	1283.00	XCSE
GENMAB A/S	16-Apr-2025	2:11:35 PM	26	1283.00	AQEU
GENMAB A/S	16-Apr-2025	2:11:35 PM	15	1283.50	CEUX
GENMAB A/S	16-Apr-2025	2:11:35 PM	86	1283.00	CEUX
GENMAB A/S	16-Apr-2025	2:12:27 PM	89	1282.50	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	26	1282.50	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	39	1282.50	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	9	1282.50	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	35	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	8	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	62	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	35	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	13	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	7	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	13	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	39	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	15	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:27 PM	89	1282.00	CEUX
GENMAB A/S	16-Apr-2025	2:12:30 PM	35	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:30 PM	39	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:31 PM	35	1281.50	XCSE
GENMAB A/S	16-Apr-2025	2:12:31 PM	35	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:31 PM	39	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:12:31 PM	8	1282.00	XCSE
GENMAB A/S	16-Apr-2025	2:13:04 PM	35	1283.00	XCSE
GENMAB A/S	16-Apr-2025	2:13:10 PM	23	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:13:10 PM	16	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:13:10 PM	14	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:13:10 PM	15	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:13:11 PM	39	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:13:11 PM	19	1284.00	XCSE

167

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:13:11 PM	9	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:15:15 PM	86	1285.00	XCSE
GENMAB A/S	16-Apr-2025	2:17:15 PM	91	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:18:00 PM	3	1285.00	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	91	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	32	1284.00	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	28	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	39	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	18	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	28	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	39	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:18:32 PM	14	1284.50	TQEX
GENMAB A/S	16-Apr-2025	2:18:32 PM	12	1284.50	TQEX
GENMAB A/S	16-Apr-2025	2:18:32 PM	26	1284.00	AQEU
GENMAB A/S	16-Apr-2025	2:18:32 PM	25	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:18:32 PM	36	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:18:32 PM	51	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:18:35 PM	19	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:18:35 PM	35	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:19:31 PM	27	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:19:55 PM	88	1284.50	XCSE
GENMAB A/S	16-Apr-2025	2:19:55 PM	44	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:21:15 PM	48	1284.50	CEUX
GENMAB A/S	16-Apr-2025	2:22:55 PM	90	1285.00	XCSE
GENMAB A/S	16-Apr-2025	2:22:55 PM	39	1285.50	XCSE
GENMAB A/S	16-Apr-2025	2:22:55 PM	30	1285.50	XCSE
GENMAB A/S	16-Apr-2025	2:22:55 PM	18	1285.50	XCSE
GENMAB A/S	16-Apr-2025	2:22:55 PM	30	1285.50	XCSE
GENMAB A/S	16-Apr-2025	2:22:55 PM	33	1285.00	AQEU
GENMAB A/S	16-Apr-2025	2:22:55 PM	93	1285.00	CEUX
GENMAB A/S	16-Apr-2025	2:22:59 PM	8	1285.50	XCSE
GENMAB A/S	16-Apr-2025	2:22:59 PM	1	1285.50	XCSE
GENMAB A/S	16-Apr-2025	2:26:53 PM	40	1287.00	CEUX
GENMAB A/S	16-Apr-2025	2:26:53 PM	18	1287.00	CEUX
GENMAB A/S	16-Apr-2025	2:26:53 PM	18	1287.00	CEUX
GENMAB A/S	16-Apr-2025	2:26:53 PM	12	1287.00	CEUX
GENMAB A/S	16-Apr-2025	2:26:53 PM	45	1286.50	CEUX
GENMAB A/S	16-Apr-2025	2:28:23 PM	23	1287.50	XCSE
GENMAB A/S	16-Apr-2025	2:28:23 PM	21	1287.50	CEUX
GENMAB A/S	16-Apr-2025	2:28:49 PM	6	1288.00	CEUX
GENMAB A/S	16-Apr-2025	2:28:49 PM	3	1288.00	CEUX
GENMAB A/S	16-Apr-2025	2:28:49 PM	12	1288.00	CEUX
GENMAB A/S	16-Apr-2025	2:29:11 PM	8	1288.00	XCSE

168

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:30:08 PM	9	1288.50	CEUX
GENMAB A/S	16-Apr-2025	2:30:08 PM	7	1288.50	CEUX
GENMAB A/S	16-Apr-2025	2:31:09 PM	29	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:31:09 PM	52	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:31:09 PM	38	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:31:09 PM	62	1289.00	TQEX
GENMAB A/S	16-Apr-2025	2:31:09 PM	49	1288.50	AQEU
GENMAB A/S	16-Apr-2025	2:31:09 PM	91	1288.50	CEUX
GENMAB A/S	16-Apr-2025	2:31:09 PM	15	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:32:17 PM	87	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:32:17 PM	13	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:32:17 PM	30	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:32:17 PM	46	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:32:18 PM	27	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:32:18 PM	41	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:32:18 PM	30	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:32:18 PM	14	1289.00	TQEX
GENMAB A/S	16-Apr-2025	2:32:18 PM	34	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:33:12 PM	88	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:12 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:12 PM	44	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:12 PM	41	1290.00	TQEX
GENMAB A/S	16-Apr-2025	2:33:12 PM	39	1290.50	AQEU
GENMAB A/S	16-Apr-2025	2:33:12 PM	90	1290.00	CEUX
GENMAB A/S	16-Apr-2025	2:33:16 PM	87	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	39	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	13	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	39	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	18	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	8	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	39	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	15	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	44	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:33:16 PM	12	1289.00	TQEX
GENMAB A/S	16-Apr-2025	2:33:16 PM	40	1289.50	AQEU
GENMAB A/S	16-Apr-2025	2:33:16 PM	92	1288.50	CEUX
GENMAB A/S	16-Apr-2025	2:35:25 PM	1	1291.50	XCSE
GENMAB A/S	16-Apr-2025	2:35:25 PM	2	1291.50	XCSE
GENMAB A/S	16-Apr-2025	2:37:03 PM	41	1291.50	XCSE
GENMAB A/S	16-Apr-2025	2:37:03 PM	46	1291.50	XCSE
GENMAB A/S	16-Apr-2025	2:37:03 PM	37	1291.50	AQEU
GENMAB A/S	16-Apr-2025	2:37:03 PM	91	1291.50	CEUX
GENMAB A/S	16-Apr-2025	2:38:24 PM	35	1291.50	XCSE

169

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:38:24 PM	39	1291.50	XCSE
GENMAB A/S	16-Apr-2025	2:38:24 PM	27	1291.50	XCSE
GENMAB A/S	16-Apr-2025	2:38:24 PM	16	1291.50	XCSE
GENMAB A/S	16-Apr-2025	2:38:24 PM	35	1291.00	XCSE
GENMAB A/S	16-Apr-2025	2:38:24 PM	15	1291.00	XCSE
GENMAB A/S	16-Apr-2025	2:38:24 PM	36	1291.00	XCSE
GENMAB A/S	16-Apr-2025	2:38:24 PM	86	1290.50	XCSE
GENMAB A/S	16-Apr-2025	2:38:24 PM	26	1290.50	TQEX
GENMAB A/S	16-Apr-2025	2:38:24 PM	38	1290.50	AQEU
GENMAB A/S	16-Apr-2025	2:38:24 PM	34	1291.50	CEUX
GENMAB A/S	16-Apr-2025	2:38:24 PM	90	1290.50	CEUX
GENMAB A/S	16-Apr-2025	2:39:49 PM	27	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:39:49 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:39:49 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:39:49 PM	16	1289.50	TQEX
GENMAB A/S	16-Apr-2025	2:39:49 PM	10	1289.50	TQEX
GENMAB A/S	16-Apr-2025	2:39:49 PM	83	1289.50	CEUX
GENMAB A/S	16-Apr-2025	2:39:49 PM	8	1289.50	CEUX
GENMAB A/S	16-Apr-2025	2:40:12 PM	13	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:12 PM	22	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:12 PM	2	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:15 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:15 PM	17	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:15 PM	35	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:15 PM	26	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:15 PM	13	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:15 PM	13	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:40:15 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:11 PM	18	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:11 PM	35	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:11 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:11 PM	25	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	13	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	13	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	47	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:12 PM	47	1290.00	XCSE

170

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:41:12 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:14 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:14 PM	47	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:14 PM	31	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:14 PM	31	1289.50	CEUX
GENMAB A/S	16-Apr-2025	2:41:14 PM	52	1289.50	CEUX
GENMAB A/S	16-Apr-2025	2:41:17 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:17 PM	47	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:17 PM	31	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:17 PM	10	1289.50	CEUX
GENMAB A/S	16-Apr-2025	2:41:18 PM	47	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:20 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:20 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:41:20 PM	41	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:42:59 PM	12	1290.00	XCSE
GENMAB A/S	16-Apr-2025	2:44:27 PM	10	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:44:27 PM	81	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:44:27 PM	35	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:44:27 PM	14	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:44:27 PM	36	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:44:27 PM	29	1289.50	CEUX
GENMAB A/S	16-Apr-2025	2:44:27 PM	85	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:44:29 PM	93	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:45:25 PM	6	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:46:45 PM	88	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:47:42 PM	39	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:47:42 PM	22	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:47:42 PM	35	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:47:42 PM	2	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:47:42 PM	19	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:47:42 PM	44	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:47:42 PM	48	1289.00	CEUX
GENMAB A/S	16-Apr-2025	2:48:16 PM	39	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:16 PM	12	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:16 PM	45	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:16 PM	21	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:25 PM	39	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:25 PM	45	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:25 PM	33	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:33 PM	49	1289.50	TQEX
GENMAB A/S	16-Apr-2025	2:48:34 PM	35	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:34 PM	15	1289.50	XCSE
GENMAB A/S	16-Apr-2025	2:48:34 PM	45	1289.50	XCSE

171

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	2:48:34 PM	16	1289.50	TQEX
GENMAB A/S	16-Apr-2025	2:48:34 PM	32	1289.50	CEUX
GENMAB A/S	16-Apr-2025	2:48:35 PM	90	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:48:43 PM	35	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:48:43 PM	45	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:49:05 PM	28	1288.50	TQEX
GENMAB A/S	16-Apr-2025	2:49:11 PM	10	1288.50	AQEU
GENMAB A/S	16-Apr-2025	2:49:35 PM	16	1288.50	AQEU
GENMAB A/S	16-Apr-2025	2:49:40 PM	93	1288.00	XCSE
GENMAB A/S	16-Apr-2025	2:49:40 PM	36	1288.50	CEUX
GENMAB A/S	16-Apr-2025	2:49:41 PM	80	1288.00	CEUX
GENMAB A/S	16-Apr-2025	2:49:41 PM	11	1288.00	CEUX
GENMAB A/S	16-Apr-2025	2:49:42 PM	34	1288.00	XCSE
GENMAB A/S	16-Apr-2025	2:49:49 PM	12	1288.50	XCSE
GENMAB A/S	16-Apr-2025	2:49:49 PM	39	1288.50	XCSE
GENMAB A/S	16-Apr-2025	2:49:49 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	2:50:10 PM	18	1288.00	CEUX
GENMAB A/S	16-Apr-2025	2:51:15 PM	87	1288.00	XCSE
GENMAB A/S	16-Apr-2025	2:51:15 PM	71	1288.00	CEUX
GENMAB A/S	16-Apr-2025	2:51:44 PM	16	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:52:05 PM	14	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:53:00 PM	3	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:53:00 PM	30	1289.00	XCSE
GENMAB A/S	16-Apr-2025	2:53:15 PM	93	1288.50	XCSE
GENMAB A/S	16-Apr-2025	2:53:15 PM	20	1288.50	TQEX
GENMAB A/S	16-Apr-2025	2:53:15 PM	86	1288.50	CEUX
GENMAB A/S	16-Apr-2025	2:55:14 PM	1	1290.50	TQEX
GENMAB A/S	16-Apr-2025	2:55:14 PM	36	1290.50	TQEX
GENMAB A/S	16-Apr-2025	2:57:55 PM	78	1290.00	CEUX
GENMAB A/S	16-Apr-2025	2:58:00 PM	48	1290.50	XCSE
GENMAB A/S	16-Apr-2025	2:58:00 PM	2	1290.50	XCSE
GENMAB A/S	16-Apr-2025	2:58:00 PM	17	1290.50	CEUX
GENMAB A/S	16-Apr-2025	2:58:15 PM	7	1290.50	TQEX
GENMAB A/S	16-Apr-2025	2:58:16 PM	31	1290.50	TQEX
GENMAB A/S	16-Apr-2025	2:58:16 PM	11	1291.00	CEUX
GENMAB A/S	16-Apr-2025	2:59:43 PM	90	1291.00	XCSE
GENMAB A/S	16-Apr-2025	2:59:43 PM	23	1291.00	CEUX
GENMAB A/S	16-Apr-2025	2:59:43 PM	70	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:00:35 PM	49	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:00:35 PM	21	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:00:35 PM	2	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:00:35 PM	13	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:01:19 PM	37	1291.50	XCSE

172

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:01:19 PM	39	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:01:20 PM	39	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:01:20 PM	37	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:01:20 PM	39	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:01:20 PM	37	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:01:20 PM	1	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:01:30 PM	87	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:01:30 PM	36	1290.50	CEUX
GENMAB A/S	16-Apr-2025	3:02:34 PM	26	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:02:34 PM	39	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:02:34 PM	21	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:02:34 PM	17	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:02:34 PM	17	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:02:34 PM	44	1289.50	TQEX
GENMAB A/S	16-Apr-2025	3:02:34 PM	42	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:05:25 PM	27	1289.50	TQEX
GENMAB A/S	16-Apr-2025	3:05:25 PM	40	1289.00	CEUX
GENMAB A/S	16-Apr-2025	3:08:22 PM	76	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:08:23 PM	38	1291.00	TQEX
GENMAB A/S	16-Apr-2025	3:08:23 PM	11	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:51 PM	93	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:09:51 PM	28	1291.50	TQEX
GENMAB A/S	16-Apr-2025	3:09:51 PM	74	1291.00	AQEU
GENMAB A/S	16-Apr-2025	3:09:51 PM	87	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:52 PM	63	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:09:52 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:52 PM	7	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:52 PM	8	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:52 PM	7	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:52 PM	16	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:53 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:09:53 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:10:45 PM	92	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:10:45 PM	35	1290.00	TQEX
GENMAB A/S	16-Apr-2025	3:10:45 PM	17	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:10:45 PM	2	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:10:45 PM	68	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:10:58 PM	35	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:10:58 PM	17	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:10:58 PM	1	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:11:25 PM	30	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:11:55 PM	28	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:11:55 PM	48	1289.00	CEUX

173

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:13:55 PM	5	1289.00	CEUX
GENMAB A/S	16-Apr-2025	3:14:58 PM	37	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:15:05 PM	88	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:35 PM	29	1288.50	TQEX
GENMAB A/S	16-Apr-2025	3:15:35 PM	36	1288.50	AQEU
GENMAB A/S	16-Apr-2025	3:15:35 PM	48	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:15:35 PM	38	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:15:38 PM	87	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	26	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	22	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	39	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	13	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	22	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:15:38 PM	29	1287.50	TQEX
GENMAB A/S	16-Apr-2025	3:15:38 PM	93	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:16:39 PM	100	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:16:45 PM	86	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:16:45 PM	86	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:17:05 PM	86	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:17:05 PM	71	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:17:05 PM	19	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:17:11 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:17:52 PM	4	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:18:25 PM	38	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:19:11 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:20:15 PM	36	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:20:15 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:20:18 PM	4	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:20:35 PM	117	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:20:35 PM	17	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:20:35 PM	51	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:20:35 PM	90	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:20:36 PM	26	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:20:36 PM	37	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:20:36 PM	5	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:20:36 PM	2	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:20:36 PM	16	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:20:37 PM	36	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:21:06 PM	37	1288.50	XCSE

174

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:21:06 PM	90	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:21:09 PM	91	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:21:09 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:21:09 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:21:09 PM	28	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:21:12 PM	14	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:21:51 PM	89	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:21:51 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:21:51 PM	25	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:21:51 PM	3	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:22:06 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	16	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	16	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	7	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	14	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	32	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:06 PM	21	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:22:06 PM	8	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:22:06 PM	36	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:22:07 PM	35	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	14	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	37	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	1	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	37	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	16	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	16	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:07 PM	31	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:08 PM	16	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:08 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:08 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:08 PM	47	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:08 PM	89	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:45 PM	17	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:45 PM	12	1287.50	XCSE

175

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:22:45 PM	37	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:45 PM	14	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:45 PM	37	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:22:45 PM	28	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:22:45 PM	16	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:22:45 PM	93	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:22:50 PM	8	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:22:53 PM	19	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:24:40 PM	20	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:24:42 PM	54	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:24:42 PM	19	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:25:13 PM	3	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:25:13 PM	6	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:25:13 PM	6	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:25:13 PM	4	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:25:13 PM	3	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:25:32 PM	39	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:25:32 PM	14	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:25:32 PM	34	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:25:32 PM	81	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:25:32 PM	3	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:26:49 PM	12	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:27:40 PM	36	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:27:50 PM	4	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:27:50 PM	2	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:27:50 PM	2	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:27:50 PM	2	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:27:50 PM	2	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:27:50 PM	2	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:27:58 PM	26	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:28:25 PM	80	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:29:14 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:29:14 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:29:16 PM	37	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:29:16 PM	16	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:29:23 PM	90	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:30:00 PM	88	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:00 PM	3	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:30:00 PM	3	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:30:00 PM	15	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:00 PM	30	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:00 PM	58	1287.50	TQEX
GENMAB A/S	16-Apr-2025	3:30:00 PM	4	1287.00	AQEU

176

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:30:00 PM	30	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:30:00 PM	15	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:30:04 PM	3	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:30:04 PM	2	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:30:04 PM	3	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:30:04 PM	3	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:30:04 PM	20	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:30:09 PM	41	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:30:10 PM	86	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:13 PM	2	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	16	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	25	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	37	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	21	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	2	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	2	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	15	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	10	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	7	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	8	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	2	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	8	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	13	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:30:40 PM	3	1289.00	TQEX
GENMAB A/S	16-Apr-2025	3:30:40 PM	37	1289.00	TQEX
GENMAB A/S	16-Apr-2025	3:30:40 PM	3	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:30:40 PM	3	1289.00	AQEU
GENMAB A/S	16-Apr-2025	3:30:40 PM	2	1289.00	AQEU
GENMAB A/S	16-Apr-2025	3:30:40 PM	2	1289.00	AQEU
GENMAB A/S	16-Apr-2025	3:30:40 PM	24	1289.00	AQEU
GENMAB A/S	16-Apr-2025	3:30:40 PM	15	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:30:40 PM	74	1289.00	CEUX
GENMAB A/S	16-Apr-2025	3:30:40 PM	12	1289.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	88	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	20	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	3	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	3	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	15	1287.50	XCSE

177

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:31:04 PM	37	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	29	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:31:04 PM	35	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:31:04 PM	5	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:31:04 PM	4	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:31:04 PM	21	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:31:04 PM	34	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	4	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	5	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	14	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:04 PM	88	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	12	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	5	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	8	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	22	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	7	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	3	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	7	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	5	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	2	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	5	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	5	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	5	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:04 PM	3	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:05 PM	28	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:31:05 PM	87	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:31:13 PM	22	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:31:45 PM	31	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:31:45 PM	34	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:31:45 PM	14	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:04 PM	34	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:32:04 PM	36	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:05 PM	15	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:05 PM	24	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:05 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:07 PM	21	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:07 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:07 PM	37	1288.50	XCSE

178

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:32:08 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:09 PM	14	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:09 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:09 PM	38	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	16	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	38	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	16	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	16	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	15	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	15	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:11 PM	38	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	30	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	1	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	30	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	31	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	15	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	50	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	15	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	5	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	15	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	17	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:12 PM	2	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:32:12 PM	2	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:32:12 PM	8	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:32:12 PM	2	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:32:12 PM	37	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:12 PM	3	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:12 PM	12	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:13 PM	17	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:13 PM	9	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:13 PM	11	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:13 PM	14	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:25 PM	37	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:32 PM	4	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:32 PM	2	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:32 PM	2	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:32 PM	7	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:32 PM	2	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:32 PM	15	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:32:33 PM	2	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:32:43 PM	93	1287.00	XCSE

179

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:32:43 PM	15	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:32:55 PM	74	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:01 PM	2	1288.50	TQEX
GENMAB A/S	16-Apr-2025	3:33:01 PM	4	1288.50	TQEX
GENMAB A/S	16-Apr-2025	3:33:01 PM	5	1288.50	TQEX
GENMAB A/S	16-Apr-2025	3:33:01 PM	85	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:01 PM	5	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:03 PM	35	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:03 PM	19	1288.50	TQEX
GENMAB A/S	16-Apr-2025	3:33:35 PM	67	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	24	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	5	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	15	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	15	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	19	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	13	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	5	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	17	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:35 PM	26	1289.50	TQEX
GENMAB A/S	16-Apr-2025	3:33:35 PM	3	1289.00	AQEU
GENMAB A/S	16-Apr-2025	3:33:35 PM	31	1289.00	AQEU
GENMAB A/S	16-Apr-2025	3:33:35 PM	89	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:35 PM	3	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:35 PM	7	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:35 PM	3	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:35 PM	2	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:36 PM	29	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:37 PM	90	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:37 PM	29	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:37 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:37 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:37 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:37 PM	32	1289.50	TQEX
GENMAB A/S	16-Apr-2025	3:33:37 PM	31	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:33:37 PM	17	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:37 PM	6	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:37 PM	69	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:37 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:33:38 PM	23	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:38 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:38 PM	17	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:38 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	37	1290.00	XCSE

180

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:33:39 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	1	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:39 PM	13	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	17	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	17	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	31	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:40 PM	35	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:43 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:43 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:43 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:45 PM	35	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:45 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:45 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:45 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:45 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:45 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:45 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	28	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	15	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:46 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:48 PM	4	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:48 PM	15	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:48 PM	5	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:48 PM	20	1289.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:50 PM	3	1288.50	CEUX

181

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:33:50 PM	8	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:51 PM	41	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	51	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	14	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	5	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	22	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	7	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	8	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	15	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:33:51 PM	8	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:33:51 PM	18	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:33:51 PM	80	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:51 PM	15	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:51 PM	11	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:51 PM	17	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:51 PM	4	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:33:51 PM	40	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:34:26 PM	5	1291.00	AQEU
GENMAB A/S	16-Apr-2025	3:34:26 PM	5	1291.00	AQEU
GENMAB A/S	16-Apr-2025	3:34:26 PM	15	1291.00	AQEU
GENMAB A/S	16-Apr-2025	3:34:26 PM	42	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:26 PM	5	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:26 PM	15	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:26 PM	13	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:26 PM	5	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:26 PM	7	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:27 PM	7	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:34:27 PM	15	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:34:27 PM	4	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:34:27 PM	4	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:34:27 PM	50	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:27 PM	3	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:32 PM	17	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:34:32 PM	16	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:34:34 PM	89	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:34:34 PM	22	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:34:41 PM	36	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:45 PM	36	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:56 PM	76	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:34:56 PM	8	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:34:56 PM	4	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:34:56 PM	6	1291.00	CEUX

182

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:34:56 PM	3	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:56 PM	71	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:56 PM	3	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:34:56 PM	6	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:35:00 PM	3	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:35:39 PM	93	1292.00	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	19	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	25	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	6	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	5	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	22	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	15	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	15	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	10	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:35:39 PM	15	1291.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	2	1291.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	14	1291.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	5	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	5	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	11	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	4	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	1	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:35:39 PM	39	1292.00	AQEU
GENMAB A/S	16-Apr-2025	3:35:39 PM	36	1292.50	CEUX
GENMAB A/S	16-Apr-2025	3:35:39 PM	51	1292.00	CEUX
GENMAB A/S	16-Apr-2025	3:35:39 PM	42	1292.00	CEUX
GENMAB A/S	16-Apr-2025	3:35:39 PM	71	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:35:39 PM	20	1291.00	CEUX
GENMAB A/S	16-Apr-2025	3:36:28 PM	69	1293.00	CEUX
GENMAB A/S	16-Apr-2025	3:36:32 PM	20	1293.00	CEUX
GENMAB A/S	16-Apr-2025	3:36:34 PM	7	1292.50	AQEU
GENMAB A/S	16-Apr-2025	3:36:34 PM	6	1292.50	AQEU
GENMAB A/S	16-Apr-2025	3:36:36 PM	87	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	17	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	14	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	25	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	3	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	12	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	5	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	11	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	9	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	4	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	13	1292.50	XCSE

183

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:36:36 PM	4	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:36 PM	30	1292.50	TQEX
GENMAB A/S	16-Apr-2025	3:36:37 PM	32	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	33	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:37 PM	27	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	90	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	10	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	15	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	15	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	26	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	80	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:53 PM	82	1292.00	CEUX
GENMAB A/S	16-Apr-2025	3:36:54 PM	54	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:56 PM	1	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:36:58 PM	92	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:37:05 PM	3	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:37:05 PM	2	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:37:05 PM	7	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:37:05 PM	6	1292.00	CEUX
GENMAB A/S	16-Apr-2025	3:37:12 PM	87	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:37:12 PM	26	1293.00	AQEU
GENMAB A/S	16-Apr-2025	3:37:12 PM	90	1293.00	CEUX
GENMAB A/S	16-Apr-2025	3:37:27 PM	19	1292.00	CEUX
GENMAB A/S	16-Apr-2025	3:37:27 PM	70	1292.00	CEUX
GENMAB A/S	16-Apr-2025	3:38:12 PM	6	1294.00	CEUX
GENMAB A/S	16-Apr-2025	3:38:12 PM	3	1294.00	CEUX
GENMAB A/S	16-Apr-2025	3:38:12 PM	3	1294.00	CEUX
GENMAB A/S	16-Apr-2025	3:38:12 PM	5	1294.00	CEUX
GENMAB A/S	16-Apr-2025	3:38:14 PM	17	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:38:14 PM	3	1294.00	XCSE
GENMAB A/S	16-Apr-2025	3:38:14 PM	12	1294.00	XCSE
GENMAB A/S	16-Apr-2025	3:38:14 PM	2	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:38:14 PM	2	1293.50	XCSE

184

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:38:14 PM	2	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:38:14 PM	5	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:38:14 PM	27	1294.00	AQEU
GENMAB A/S	16-Apr-2025	3:38:14 PM	73	1294.00	CEUX
GENMAB A/S	16-Apr-2025	3:38:29 PM	89	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:38:29 PM	35	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:38:29 PM	90	1293.50	CEUX
GENMAB A/S	16-Apr-2025	3:38:30 PM	26	1293.50	AQEU
GENMAB A/S	16-Apr-2025	3:39:01 PM	86	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:39:01 PM	46	1293.50	CEUX
GENMAB A/S	16-Apr-2025	3:39:01 PM	42	1293.50	CEUX
GENMAB A/S	16-Apr-2025	3:39:02 PM	37	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:39:02 PM	19	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:39:02 PM	14	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:39:02 PM	17	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:39:02 PM	30	1293.50	XCSE
GENMAB A/S	16-Apr-2025	3:39:02 PM	14	1293.00	TQEX
GENMAB A/S	16-Apr-2025	3:39:02 PM	12	1293.00	TQEX
GENMAB A/S	16-Apr-2025	3:39:07 PM	89	1292.50	XCSE
GENMAB A/S	16-Apr-2025	3:39:07 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:07 PM	20	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:07 PM	15	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:07 PM	15	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:07 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:07 PM	86	1292.50	CEUX
GENMAB A/S	16-Apr-2025	3:39:08 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:08 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:08 PM	5	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:08 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:19 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:19 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:19 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:19 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:19 PM	32	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	15	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	71	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	59	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:20 PM	5	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	9	1293.00	XCSE

185

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:39:21 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	35	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	15	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:21 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:23 PM	15	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:23 PM	30	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:23 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:23 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:23 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:23 PM	16	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:23 PM	8	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:24 PM	14	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:24 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:24 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:24 PM	29	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:25 PM	17	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:25 PM	37	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:25 PM	11	1293.00	XCSE
GENMAB A/S	16-Apr-2025	3:39:25 PM	31	1292.00	TQEX
GENMAB A/S	16-Apr-2025	3:40:03 PM	88	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:03 PM	1	1291.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:15 PM	92	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:15 PM	10	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:15 PM	13	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:15 PM	17	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:15 PM	15	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:15 PM	15	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:15 PM	2	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:40:15 PM	3	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:40:15 PM	7	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:40:15 PM	8	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:40:15 PM	2	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:40:15 PM	3	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:40:15 PM	2	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:40:15 PM	28	1291.00	AQEU
GENMAB A/S	16-Apr-2025	3:40:15 PM	88	1291.00	CEUX

186

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:40:16 PM	86	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:22 PM	3	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:23 PM	26	1290.00	AQEU
GENMAB A/S	16-Apr-2025	3:40:23 PM	1	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:40:23 PM	87	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:40:55 PM	87	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	37	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	3	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	6	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	3	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	2	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	5	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	2	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	2	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	5	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	10	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	12	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	30	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:55 PM	26	1289.00	TQEX
GENMAB A/S	16-Apr-2025	3:40:55 PM	53	1289.00	CEUX
GENMAB A/S	16-Apr-2025	3:40:55 PM	32	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:40:55 PM	34	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:40:55 PM	20	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:40:57 PM	117	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:40:57 PM	28	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:41:02 PM	2	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:41:06 PM	4	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:41:06 PM	37	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:41:17 PM	2	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:42:08 PM	89	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:42:08 PM	50	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:42:08 PM	37	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:42:08 PM	32	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:42:08 PM	26	1290.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:01 PM	37	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:01 PM	2	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:43:01 PM	37	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:01 PM	26	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:01 PM	70	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:02 PM	45	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:02 PM	37	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:02 PM	16	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:02 PM	16	1291.00	XCSE

187

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:43:02 PM	45	1291.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:02 PM	31	1290.50	TQEX
GENMAB A/S	16-Apr-2025	3:43:02 PM	3	1290.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:15 PM	87	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	37	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	5	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	2	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	14	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	8	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	2	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	4	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	2	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	2	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	7	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:15 PM	6	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:15 PM	7	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:15 PM	3	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:15 PM	2	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:15 PM	2	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:15 PM	2	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:15 PM	11	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:16 PM	3	1289.50	AQEU
GENMAB A/S	16-Apr-2025	3:43:29 PM	4	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:29 PM	2	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:29 PM	25	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:29 PM	5	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:29 PM	2	1289.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:29 PM	21	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:43:29 PM	8	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:43:29 PM	37	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:43:38 PM	60	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:38 PM	28	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:43:38 PM	2	1290.00	TQEX
GENMAB A/S	16-Apr-2025	3:43:38 PM	3	1290.00	TQEX
GENMAB A/S	16-Apr-2025	3:43:38 PM	2	1290.00	TQEX
GENMAB A/S	16-Apr-2025	3:43:38 PM	8	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:38 PM	16	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:38 PM	10	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:38 PM	4	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:38 PM	5	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:38 PM	25	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:38 PM	11	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:38 PM	4	1290.00	CEUX

188

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:43:38 PM	7	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:43:50 PM	88	1290.50	XCSE
GENMAB A/S	16-Apr-2025	3:44:01 PM	60	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:44:01 PM	16	1290.00	XCSE
GENMAB A/S	16-Apr-2025	3:44:01 PM	3	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:44:01 PM	15	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:44:01 PM	15	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:44:01 PM	53	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:44:01 PM	88	1290.00	CEUX
GENMAB A/S	16-Apr-2025	3:44:35 PM	5	1289.50	XCSE
GENMAB A/S	16-Apr-2025	3:45:01 PM	26	1288.50	CEUX
GENMAB A/S	16-Apr-2025	3:45:11 PM	89	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:45:13 PM	20	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:45:17 PM	6	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:45:17 PM	3	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:45:17 PM	2	1288.50	XCSE
GENMAB A/S	16-Apr-2025	3:45:17 PM	5	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:17 PM	2	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:17 PM	4	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:18 PM	3	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:22 PM	10	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:23 PM	5	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:23 PM	2	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:28 PM	4	1288.00	TQEX
GENMAB A/S	16-Apr-2025	3:45:29 PM	3	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:45:29 PM	16	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:45:29 PM	3	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:45:33 PM	2	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:45:33 PM	4	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	8	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	3	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	4	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	2	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	10	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	5	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	5	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	7	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:45:33 PM	13	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:46:15 PM	89	1288.00	XCSE
GENMAB A/S	16-Apr-2025	3:46:15 PM	32	1288.00	AQEU
GENMAB A/S	16-Apr-2025	3:46:15 PM	8	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:46:15 PM	7	1288.00	CEUX

189

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:46:15 PM	6	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:46:15 PM	2	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:46:15 PM	4	1288.00	CEUX
GENMAB A/S	16-Apr-2025	3:46:49 PM	5	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:46:49 PM	4	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:46:49 PM	4	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:46:49 PM	68	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:46:49 PM	21	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:46:49 PM	2	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:46:49 PM	7	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:46:59 PM	87	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:46:59 PM	70	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:46:59 PM	37	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:46:59 PM	10	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:46:59 PM	30	1287.00	TQEX
GENMAB A/S	16-Apr-2025	3:46:59 PM	26	1287.00	AQEU
GENMAB A/S	16-Apr-2025	3:46:59 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:47:00 PM	37	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:47:00 PM	19	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:47:00 PM	100	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:47:00 PM	11	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:47:08 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:08 PM	5	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:08 PM	7	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:47:08 PM	8	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:47:08 PM	86	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:47:22 PM	26	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:22 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:25 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:25 PM	15	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:25 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:25 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:25 PM	80	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:47:25 PM	9	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:47:26 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:26 PM	14	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:26 PM	28	1286.50	AQEU
GENMAB A/S	16-Apr-2025	3:47:28 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:29 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:29 PM	2	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:29 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:30 PM	2	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:34 PM	15	1287.00	XCSE

190

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:47:35 PM	15	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	14	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	14	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	15	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	14	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	49	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	15	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	49	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:35 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:42 PM	100	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:48 PM	72	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:47:48 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:48:00 PM	23	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:48:25 PM	65	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:48:55 PM	2	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:49:50 PM	1	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:49:50 PM	88	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:49:50 PM	2	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:49:50 PM	3	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:49:50 PM	28	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:49:50 PM	4	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:49:50 PM	20	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:49:50 PM	2	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:49:50 PM	3	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:49:50 PM	9	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:49:50 PM	7	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:49:50 PM	4	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:50:07 PM	63	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:07 PM	54	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:07 PM	46	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:07 PM	6	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:07 PM	3	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:08 PM	8	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:08 PM	4	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:08 PM	7	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:08 PM	10	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:08 PM	4	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:08 PM	16	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:50:08 PM	2	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:50:08 PM	8	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:50:08 PM	4	1286.00	CEUX

191

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:50:08 PM	3	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:50:08 PM	4	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:50:08 PM	6	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:50:08 PM	3	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:50:32 PM	13	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:50:32 PM	3	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:50:32 PM	22	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:50:47 PM	89	1287.50	XCSE
GENMAB A/S	16-Apr-2025	3:50:47 PM	19	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:50:50 PM	88	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:50:50 PM	4	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:50:50 PM	15	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:50:50 PM	7	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:50:50 PM	15	1287.50	AQEU
GENMAB A/S	16-Apr-2025	3:50:50 PM	16	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:50:50 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	3:50:50 PM	4	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:50:50 PM	6	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:50:50 PM	63	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:51:03 PM	93	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:51:09 PM	7	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:51:09 PM	3	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:51:09 PM	4	1286.50	AQEU
GENMAB A/S	16-Apr-2025	3:51:09 PM	9	1286.50	AQEU
GENMAB A/S	16-Apr-2025	3:51:09 PM	4	1286.50	AQEU
GENMAB A/S	16-Apr-2025	3:51:09 PM	92	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:51:09 PM	4	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:51:09 PM	2	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:51:33 PM	2	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:51:35 PM	21	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:51:35 PM	17	1286.50	AQEU
GENMAB A/S	16-Apr-2025	3:51:39 PM	4	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:51:45 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:51:45 PM	93	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:52:51 PM	5	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:52:51 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:52:51 PM	15	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:52:51 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:52:51 PM	4	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:52:51 PM	7	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:52:51 PM	2	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:52:51 PM	2	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:52:51 PM	3	1286.00	CEUX

192

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:52:51 PM	6	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:52:51 PM	69	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:53:01 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:01 PM	20	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:01 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:02 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:02 PM	11	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:02 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:02 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:53:02 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:53:03 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:03 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:53:04 PM	40	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:04 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:04 PM	40	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:04 PM	32	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:53:07 PM	95	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:53:07 PM	22	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:53:10 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:53:25 PM	20	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:25 PM	72	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:53:25 PM	27	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:53:25 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:53:25 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	3:53:25 PM	55	1286.50	TQEX
GENMAB A/S	16-Apr-2025	3:53:25 PM	59	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:53:25 PM	29	1286.50	CEUX
GENMAB A/S	16-Apr-2025	3:54:10 PM	60	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:54:10 PM	28	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:10 PM	29	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:10 PM	31	1286.50	AQEU
GENMAB A/S	16-Apr-2025	3:54:10 PM	36	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:54:10 PM	1	1287.00	CEUX
GENMAB A/S	16-Apr-2025	3:54:10 PM	14	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:54:10 PM	75	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:54:11 PM	17	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:11 PM	13	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:11 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:11 PM	42	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:11 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:11 PM	16	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:11 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:11 PM	18	1286.50	XCSE

193

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:54:12 PM	10	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	15	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	19	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	9	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	17	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	37	1286.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	4	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:12 PM	87	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:54:13 PM	14	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:54:13 PM	7	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:54:35 PM	50	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:00 PM	87	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	46	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	5	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	46	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	10	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	5	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	5	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	1	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	2	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	25	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:00 PM	4	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	15	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	10	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	4	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	3	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	5	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	13	1286.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	3	1285.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	24	1285.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:00 PM	7	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:55:00 PM	7	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:55:00 PM	2	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:55:00 PM	14	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:55:00 PM	5	1284.50	AQEU
GENMAB A/S	16-Apr-2025	3:55:00 PM	6	1284.50	AQEU
GENMAB A/S	16-Apr-2025	3:55:00 PM	21	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:00 PM	69	1286.00	CEUX

194

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:55:00 PM	4	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:00 PM	32	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:03 PM	33	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:03 PM	52	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:03 PM	1	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:03 PM	5	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:07 PM	46	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:07 PM	6	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:07 PM	3	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:07 PM	16	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:07 PM	16	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:07 PM	30	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:07 PM	26	1285.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:07 PM	24	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:07 PM	5	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:07 PM	15	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:07 PM	5	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:07 PM	37	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	47	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:23 PM	12	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:23 PM	4	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:23 PM	6	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:23 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:23 PM	4	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:23 PM	7	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:23 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:23 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:55:23 PM	19	1284.50	AQEU
GENMAB A/S	16-Apr-2025	3:55:23 PM	3	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	10	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	3	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	3	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	4	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	6	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	5	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:23 PM	3	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:55:24 PM	91	1284.00	XCSE
GENMAB A/S	16-Apr-2025	3:55:24 PM	26	1284.00	AQEU
GENMAB A/S	16-Apr-2025	3:55:25 PM	14	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:55:33 PM	9	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:56:25 PM	46	1284.50	XCSE
GENMAB A/S	16-Apr-2025	3:56:25 PM	46	1283.50	CEUX
GENMAB A/S	16-Apr-2025	3:56:41 PM	15	1285.00	XCSE

195

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:57:00 PM	87	1285.00	XCSE
GENMAB A/S	16-Apr-2025	3:57:25 PM	36	1286.00	CEUX
GENMAB A/S	16-Apr-2025	3:57:27 PM	14	1286.00	XCSE
GENMAB A/S	16-Apr-2025	3:57:54 PM	90	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:57:54 PM	53	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:54 PM	5	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:55 PM	2	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:57:55 PM	8	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:57:55 PM	2	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:57:55 PM	2	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:57:55 PM	3	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:57:55 PM	4	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:57:55 PM	12	1285.50	AQEU
GENMAB A/S	16-Apr-2025	3:57:55 PM	7	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:55 PM	6	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:55 PM	2	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:55 PM	2	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:55 PM	2	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:55 PM	10	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:57:55 PM	6	1285.50	CEUX
GENMAB A/S	16-Apr-2025	3:58:05 PM	92	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:21 PM	39	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:21 PM	35	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:21 PM	37	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:21 PM	37	1285.00	TQEX
GENMAB A/S	16-Apr-2025	3:58:34 PM	22	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:34 PM	37	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:34 PM	16	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:34 PM	14	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:34 PM	14	1285.50	XCSE
GENMAB A/S	16-Apr-2025	3:58:34 PM	87	1284.50	CEUX
GENMAB A/S	16-Apr-2025	3:58:55 PM	22	1285.00	XCSE
GENMAB A/S	16-Apr-2025	3:58:55 PM	66	1285.00	XCSE
GENMAB A/S	16-Apr-2025	3:58:55 PM	35	1285.00	TQEX
GENMAB A/S	16-Apr-2025	3:58:55 PM	35	1285.00	AQEU
GENMAB A/S	16-Apr-2025	3:58:55 PM	87	1285.00	CEUX
GENMAB A/S	16-Apr-2025	3:59:35 PM	15	1284.00	XCSE
GENMAB A/S	16-Apr-2025	3:59:35 PM	74	1284.00	XCSE
GENMAB A/S	16-Apr-2025	3:59:35 PM	88	1283.00	XCSE
GENMAB A/S	16-Apr-2025	3:59:35 PM	4	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:59:35 PM	23	1284.00	TQEX
GENMAB A/S	16-Apr-2025	3:59:35 PM	28	1284.00	AQEU
GENMAB A/S	16-Apr-2025	3:59:35 PM	3	1283.50	CEUX

196

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	3:59:35 PM	1	1282.50	CEUX
GENMAB A/S	16-Apr-2025	3:59:48 PM	18	1282.50	XCSE
GENMAB A/S	16-Apr-2025	3:59:48 PM	46	1282.50	TQEX
GENMAB A/S	16-Apr-2025	3:59:48 PM	90	1282.50	CEUX
GENMAB A/S	16-Apr-2025	3:59:48 PM	12	1282.50	CEUX
GENMAB A/S	16-Apr-2025	3:59:48 PM	3	1282.50	CEUX
GENMAB A/S	16-Apr-2025	3:59:58 PM	16	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:20 PM	26	1282.00	AQEU
GENMAB A/S	16-Apr-2025	4:00:26 PM	100	1282.00	XCSE
GENMAB A/S	16-Apr-2025	4:00:26 PM	45	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:26 PM	71	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:26 PM	1	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:27 PM	25	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:27 PM	30	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:27 PM	7	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:27 PM	4	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:27 PM	51	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:27 PM	88	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:34 PM	17	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:35 PM	18	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:00:36 PM	71	1281.50	CEUX
GENMAB A/S	16-Apr-2025	4:01:05 PM	7	1281.50	CEUX
GENMAB A/S	16-Apr-2025	4:01:19 PM	86	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:19 PM	9	1281.50	CEUX
GENMAB A/S	16-Apr-2025	4:01:27 PM	5	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	88	1280.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	37	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	66	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	22	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	16	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	17	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	14	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	32	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:35 PM	16	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:36 PM	32	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:36 PM	14	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:36 PM	14	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:36 PM	17	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:36 PM	37	1281.50	XCSE
GENMAB A/S	16-Apr-2025	4:01:45 PM	88	1280.00	CEUX
GENMAB A/S	16-Apr-2025	4:02:00 PM	88	1279.50	XCSE
GENMAB A/S	16-Apr-2025	4:02:00 PM	36	1280.00	CEUX
GENMAB A/S	16-Apr-2025	4:02:00 PM	50	1280.00	CEUX

197

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:02:01 PM	15	1279.50	AQEU
GENMAB A/S	16-Apr-2025	4:02:02 PM	39	1279.00	TQEX
GENMAB A/S	16-Apr-2025	4:02:02 PM	1	1279.00	TQEX
GENMAB A/S	16-Apr-2025	4:02:02 PM	16	1279.50	AQEU
GENMAB A/S	16-Apr-2025	4:02:02 PM	36	1279.50	CEUX
GENMAB A/S	16-Apr-2025	4:02:20 PM	7	1279.50	CEUX
GENMAB A/S	16-Apr-2025	4:02:35 PM	34	1280.00	CEUX
GENMAB A/S	16-Apr-2025	4:02:35 PM	59	1280.00	CEUX
GENMAB A/S	16-Apr-2025	4:02:43 PM	46	1280.50	XCSE
GENMAB A/S	16-Apr-2025	4:03:35 PM	89	1280.50	XCSE
GENMAB A/S	16-Apr-2025	4:03:35 PM	1	1280.00	CEUX
GENMAB A/S	16-Apr-2025	4:03:42 PM	3	1280.50	XCSE
GENMAB A/S	16-Apr-2025	4:03:43 PM	19	1281.00	CEUX
GENMAB A/S	16-Apr-2025	4:03:43 PM	24	1281.00	CEUX
GENMAB A/S	16-Apr-2025	4:03:53 PM	38	1282.00	CEUX
GENMAB A/S	16-Apr-2025	4:03:53 PM	2	1282.00	CEUX
GENMAB A/S	16-Apr-2025	4:03:54 PM	12	1282.00	TQEX
GENMAB A/S	16-Apr-2025	4:03:54 PM	25	1282.00	CEUX
GENMAB A/S	16-Apr-2025	4:03:54 PM	68	1282.00	CEUX
GENMAB A/S	16-Apr-2025	4:03:59 PM	24	1282.00	TQEX
GENMAB A/S	16-Apr-2025	4:04:06 PM	15	1282.50	CEUX
GENMAB A/S	16-Apr-2025	4:05:05 PM	46	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:05:05 PM	13	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:05:05 PM	8	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:05:05 PM	26	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:05:14 PM	87	1282.50	XCSE
GENMAB A/S	16-Apr-2025	4:05:14 PM	58	1282.50	CEUX
GENMAB A/S	16-Apr-2025	4:05:17 PM	35	1282.50	CEUX
GENMAB A/S	16-Apr-2025	4:06:35 PM	86	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:06:35 PM	40	1284.00	AQEU
GENMAB A/S	16-Apr-2025	4:06:35 PM	27	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:06:35 PM	1	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:07:16 PM	16	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:07:16 PM	2	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:07:19 PM	10	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:07:19 PM	4	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:07:35 PM	91	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:07:35 PM	55	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:35 PM	46	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:35 PM	15	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:35 PM	1	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:35 PM	25	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:35 PM	15	1285.00	XCSE

198

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:07:35 PM	5	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:35 PM	91	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:07:39 PM	46	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:39 PM	24	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:44 PM	46	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:44 PM	3	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:44 PM	30	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:07:50 PM	46	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:07:52 PM	4	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:08:05 PM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:05 PM	46	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:05 PM	6	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:08:05 PM	21	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:08:05 PM	4	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:08:05 PM	9	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:08:05 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:08:09 PM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:09 PM	46	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:09 PM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:09 PM	46	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:09 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:08:09 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:08:10 PM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:10 PM	35	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:10 PM	47	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:10 PM	15	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:10 PM	16	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:10 PM	4	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:10 PM	3	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:08:55 PM	90	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:55 PM	29	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:08:58 PM	100	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:58 PM	14	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:08:58 PM	16	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:08:58 PM	101	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:09:19 PM	37	1284.50	TQEX
GENMAB A/S	16-Apr-2025	4:09:19 PM	84	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:09:19 PM	7	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:10:01 PM	92	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:10:01 PM	34	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:10:01 PM	16	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:10:01 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:10:01 PM	50	1285.00	CEUX

199

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:10:06 PM	21	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:10:42 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:10:42 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:10:42 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:10:42 PM	16	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:10:42 PM	4	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:10:42 PM	20	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:10:42 PM	8	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:10:43 PM	37	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:10:53 PM	2	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:10:53 PM	2	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:10:53 PM	85	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:10:54 PM	22	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:10:59 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:16 PM	34	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:11:16 PM	22	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:11:16 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:17 PM	18	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:11:27 PM	6	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:11:27 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:27 PM	51	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:33 PM	12	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:11:33 PM	10	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:11:33 PM	46	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:11:33 PM	91	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:11:33 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:11:33 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:11:33 PM	10	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:11:33 PM	3	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:11:33 PM	11	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:11:33 PM	9	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:11:33 PM	7	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:11:33 PM	3	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:11:33 PM	4	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:33 PM	3	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:33 PM	5	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:33 PM	38	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:11:48 PM	15	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:11:51 PM	12	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:11:51 PM	12	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:13:06 PM	2	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:11 PM	39	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:11 PM	20	1284.00	XCSE

200

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:13:11 PM	7	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:19 PM	46	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:19 PM	4	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:19 PM	5	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:19 PM	15	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:19 PM	15	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:19 PM	32	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:19 PM	10	1283.00	TQEX
GENMAB A/S	16-Apr-2025	4:13:19 PM	11	1283.50	AQEU
GENMAB A/S	16-Apr-2025	4:13:19 PM	25	1283.50	AQEU
GENMAB A/S	16-Apr-2025	4:13:19 PM	1	1283.50	AQEU
GENMAB A/S	16-Apr-2025	4:13:19 PM	93	1283.00	CEUX
GENMAB A/S	16-Apr-2025	4:13:20 PM	34	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	16	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	46	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	18	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	3	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	17	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	22	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	46	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	15	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	3	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	10	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	46	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	8	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	13	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	37	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:20 PM	3	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:21 PM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:21 PM	46	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:21 PM	18	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:21 PM	28	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:25 PM	14	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:25 PM	12	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:30 PM	36	1283.50	CEUX
GENMAB A/S	16-Apr-2025	4:13:30 PM	9	1283.50	CEUX
GENMAB A/S	16-Apr-2025	4:13:44 PM	93	1283.00	XCSE
GENMAB A/S	16-Apr-2025	4:13:44 PM	13	1283.00	TQEX
GENMAB A/S	16-Apr-2025	4:13:44 PM	4	1283.00	TQEX
GENMAB A/S	16-Apr-2025	4:13:45 PM	46	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:45 PM	35	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:45 PM	10	1283.50	XCSE

201

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:13:45 PM	3	1283.50	XCSE
GENMAB A/S	16-Apr-2025	4:13:59 PM	3	1282.50	AQEU
GENMAB A/S	16-Apr-2025	4:14:25 PM	26	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:14:25 PM	36	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:14:25 PM	25	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:15:21 PM	31	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:15:21 PM	35	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:15:21 PM	3	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:15:21 PM	17	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:15:21 PM	34	1284.50	AQEU
GENMAB A/S	16-Apr-2025	4:15:21 PM	20	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:15:21 PM	13	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:15:35 PM	42	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:16:10 PM	87	1285.00	XCSE
GENMAB A/S	16-Apr-2025	4:16:10 PM	5	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:16:10 PM	4	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:16:10 PM	3	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:16:10 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:16:10 PM	2	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:16:10 PM	7	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:16:10 PM	3	1284.00	TQEX
GENMAB A/S	16-Apr-2025	4:16:10 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:16:10 PM	25	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:16:10 PM	50	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:16:10 PM	9	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:16:10 PM	42	1284.00	CEUX
GENMAB A/S	16-Apr-2025	4:16:12 PM	46	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:16:12 PM	15	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:16:17 PM	18	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:16:20 PM	92	1284.00	XCSE
GENMAB A/S	16-Apr-2025	4:16:20 PM	36	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:17:06 PM	89	1284.50	XCSE
GENMAB A/S	16-Apr-2025	4:17:19 PM	77	1284.50	CEUX
GENMAB A/S	16-Apr-2025	4:17:24 PM	34	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:17:24 PM	12	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:17:24 PM	20	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:17:24 PM	6	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:17:39 PM	36	1285.00	CEUX
GENMAB A/S	16-Apr-2025	4:18:05 PM	43	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:05 PM	45	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:05 PM	6	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:05 PM	2	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:05 PM	3	1285.50	XCSE

202

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:18:05 PM	2	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:05 PM	2	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:05 PM	2	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:05 PM	2	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:05 PM	5	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:05 PM	26	1285.50	AQEU
GENMAB A/S	16-Apr-2025	4:18:05 PM	13	1285.50	AQEU
GENMAB A/S	16-Apr-2025	4:18:05 PM	88	1285.50	CEUX
GENMAB A/S	16-Apr-2025	4:18:05 PM	4	1285.50	CEUX
GENMAB A/S	16-Apr-2025	4:18:05 PM	5	1285.50	CEUX
GENMAB A/S	16-Apr-2025	4:18:35 PM	7	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:35 PM	9	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:35 PM	90	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:35 PM	4	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:35 PM	8	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:35 PM	2	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:35 PM	13	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:18:37 PM	35	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:37 PM	46	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:37 PM	36	1285.50	CEUX
GENMAB A/S	16-Apr-2025	4:18:38 PM	46	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:18:38 PM	23	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:18:38 PM	67	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:18:38 PM	23	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:18:38 PM	4	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:18:39 PM	31	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:18:39 PM	46	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:18:39 PM	18	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:18:49 PM	16	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:18:57 PM	17	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:19:04 PM	46	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:19:04 PM	36	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:19:25 PM	87	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:19:25 PM	46	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:19:25 PM	41	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:19:29 PM	17	1285.50	AQEU
GENMAB A/S	16-Apr-2025	4:19:59 PM	9	1285.50	AQEU
GENMAB A/S	16-Apr-2025	4:20:27 PM	93	1286.50	XCSE
GENMAB A/S	16-Apr-2025	4:21:00 PM	75	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:21:00 PM	13	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:21:23 PM	18	1287.00	TQEX
GENMAB A/S	16-Apr-2025	4:21:23 PM	38	1287.00	TQEX
GENMAB A/S	16-Apr-2025	4:21:29 PM	26	1287.00	TQEX

203

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:21:35 PM	87	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:21:35 PM	31	1287.00	TQEX
GENMAB A/S	16-Apr-2025	4:21:45 PM	12	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:21:45 PM	79	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:22:05 PM	22	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:22:05 PM	18	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:22:05 PM	83	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:22:52 PM	25	1287.00	TQEX
GENMAB A/S	16-Apr-2025	4:22:52 PM	5	1287.00	TQEX
GENMAB A/S	16-Apr-2025	4:22:55 PM	80	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:23:08 PM	11	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:23:25 PM	88	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:23:25 PM	25	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:23:25 PM	54	1287.50	AQEU
GENMAB A/S	16-Apr-2025	4:24:15 PM	86	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:24:15 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:24:15 PM	16	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:24:15 PM	2	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:24:15 PM	93	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:24:15 PM	42	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:24:15 PM	19	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:24:15 PM	33	1287.50	AQEU
GENMAB A/S	16-Apr-2025	4:24:58 PM	38	1288.00	AQEU
GENMAB A/S	16-Apr-2025	4:25:04 PM	33	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:04 PM	27	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:05 PM	35	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:05 PM	26	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:05 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:06 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:06 PM	20	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:06 PM	18	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:06 PM	15	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:08 PM	10	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:08 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:55 PM	89	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:25:55 PM	93	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:26:19 PM	43	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:19 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:26:19 PM	17	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:26:19 PM	16	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:26:19 PM	23	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:26:20 PM	26	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:20 PM	18	1287.50	XCSE

204

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:26:20 PM	46	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:20 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:26:23 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:26:55 PM	46	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	21	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	15	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	35	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	7	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	25	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	46	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	15	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	16	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	8	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:55 PM	34	1287.00	TQEX
GENMAB A/S	16-Apr-2025	4:26:56 PM	8	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:56 PM	17	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:56 PM	15	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:56 PM	46	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:26:56 PM	22	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:27:15 PM	91	1286.50	XCSE
GENMAB A/S	16-Apr-2025	4:27:15 PM	8	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:27:15 PM	17	1286.50	AQEU
GENMAB A/S	16-Apr-2025	4:27:15 PM	9	1286.50	AQEU
GENMAB A/S	16-Apr-2025	4:27:36 PM	31	1286.50	XCSE
GENMAB A/S	16-Apr-2025	4:27:36 PM	24	1286.50	XCSE
GENMAB A/S	16-Apr-2025	4:27:36 PM	9	1286.00	TQEX
GENMAB A/S	16-Apr-2025	4:27:36 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:27:36 PM	52	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:27:42 PM	14	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:27:42 PM	18	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:27:55 PM	15	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:28:29 PM	24	1286.00	TQEX
GENMAB A/S	16-Apr-2025	4:28:52 PM	46	1286.50	XCSE
GENMAB A/S	16-Apr-2025	4:28:55 PM	5	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:28:55 PM	36	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:28:55 PM	86	1285.50	CEUX
GENMAB A/S	16-Apr-2025	4:28:56 PM	26	1285.50	AQEU
GENMAB A/S	16-Apr-2025	4:29:10 PM	30	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:29:49 PM	86	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:29:49 PM	8	1285.50	AQEU
GENMAB A/S	16-Apr-2025	4:30:15 PM	12	1285.00	TQEX
GENMAB A/S	16-Apr-2025	4:31:04 PM	88	1285.50	XCSE
GENMAB A/S	16-Apr-2025	4:31:04 PM	35	1286.00	XCSE

205

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:31:04 PM	46	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:04 PM	45	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:04 PM	7	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:04 PM	35	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:04 PM	30	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:04 PM	89	1285.50	CEUX
GENMAB A/S	16-Apr-2025	4:31:04 PM	30	1285.50	CEUX
GENMAB A/S	16-Apr-2025	4:31:04 PM	36	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:31:04 PM	9	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:31:04 PM	9	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:31:05 PM	23	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:05 PM	46	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:25 PM	21	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:31:25 PM	7	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:32:02 PM	46	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:32:02 PM	40	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:32:02 PM	3	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:32:02 PM	45	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:32:15 PM	30	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:32:46 PM	40	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:32:46 PM	51	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:32:46 PM	52	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:32:46 PM	32	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:33:15 PM	48	1287.50	TQEX
GENMAB A/S	16-Apr-2025	4:33:15 PM	13	1287.50	TQEX
GENMAB A/S	16-Apr-2025	4:33:15 PM	34	1287.50	AQEU
GENMAB A/S	16-Apr-2025	4:33:16 PM	10	1287.50	AQEU
GENMAB A/S	16-Apr-2025	4:33:24 PM	39	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:33:24 PM	35	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:33:24 PM	13	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:33:24 PM	28	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:33:24 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:24 PM	17	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:25 PM	46	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:33:25 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:26 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:26 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:29 PM	5	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:33:29 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:30 PM	17	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:36 PM	14	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:33:36 PM	43	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:33:53 PM	81	1288.00	CEUX

206

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:34:07 PM	12	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:34:22 PM	90	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:34:22 PM	35	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:34:22 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:34:22 PM	44	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:34:23 PM	7	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:34:29 PM	2	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:34:32 PM	35	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:34:32 PM	35	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:34:32 PM	35	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:34:55 PM	47	1286.50	TQEX
GENMAB A/S	16-Apr-2025	4:35:35 PM	13	1286.50	TQEX
GENMAB A/S	16-Apr-2025	4:35:35 PM	43	1286.50	AQEU
GENMAB A/S	16-Apr-2025	4:35:48 PM	35	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:35:48 PM	52	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:35:48 PM	9	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:35:48 PM	36	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:35:49 PM	21	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:36:15 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:15 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:15 PM	58	1286.50	TQEX
GENMAB A/S	16-Apr-2025	4:36:15 PM	26	1286.50	AQEU
GENMAB A/S	16-Apr-2025	4:36:16 PM	32	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:16 PM	7	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:16 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:16 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:16 PM	36	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:36:18 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:18 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:18 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:22 PM	25	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:22 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:22 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	19	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	19	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	33	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	17	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	16	1287.00	XCSE

207

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:36:23 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:23 PM	22	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	19	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	15	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	21	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	15	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:24 PM	3	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:25 PM	14	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:25 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:25 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:26 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:26 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:28 PM	16	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:28 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:28 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:28 PM	37	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:28 PM	46	1287.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:45 PM	79	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:36:45 PM	3	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:36:45 PM	9	1286.00	CEUX
GENMAB A/S	16-Apr-2025	4:36:46 PM	87	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:36:46 PM	34	1286.00	TQEX
GENMAB A/S	16-Apr-2025	4:36:47 PM	42	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:36:47 PM	22	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:36:47 PM	9	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:36:47 PM	8	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:36:47 PM	9	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:37:05 PM	73	1286.00	XCSE
GENMAB A/S	16-Apr-2025	4:37:05 PM	36	1286.50	CEUX
GENMAB A/S	16-Apr-2025	4:37:16 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:37:17 PM	4	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:37:20 PM	69	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:37:20 PM	1	1287.50	XCSE
GENMAB A/S	16-Apr-2025	4:37:20 PM	87	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:37:56 PM	59	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:37:56 PM	29	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:37:56 PM	80	1289.00	CEUX

208

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:38:04 PM	36	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:38:05 PM	36	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:38:09 PM	91	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:38:09 PM	15	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:38:35 PM	3	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:38:35 PM	37	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:38:38 PM	9	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:38:38 PM	24	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:38:38 PM	26	1288.00	TQEX
GENMAB A/S	16-Apr-2025	4:38:38 PM	36	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:39:13 PM	36	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:39:17 PM	35	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:39:17 PM	6	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:39:17 PM	23	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:39:17 PM	14	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:39:23 PM	16	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:39:45 PM	58	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:40:08 PM	7	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:40:08 PM	6	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:40:08 PM	6	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:41:25 PM	24	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:41:25 PM	66	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:41:26 PM	36	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:41:26 PM	36	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:41:27 PM	36	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:41:59 PM	48	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:43:05 PM	92	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:43:05 PM	34	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:43:05 PM	28	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:43:05 PM	86	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:43:05 PM	51	1290.50	AQEU
GENMAB A/S	16-Apr-2025	4:43:25 PM	20	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:43:25 PM	17	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:43:25 PM	46	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:43:43 PM	16	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:43:43 PM	4	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:43:43 PM	4	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:43:43 PM	2	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:43:46 PM	18	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:43:46 PM	25	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:43:46 PM	12	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:43:47 PM	7	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:43:49 PM	36	1290.50	CEUX

209

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:44:09 PM	89	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:44:49 PM	92	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:44:49 PM	25	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:44:49 PM	30	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:44:49 PM	40	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:44:49 PM	35	1291.50	CEUX
GENMAB A/S	16-Apr-2025	4:45:07 PM	88	1291.00	CEUX
GENMAB A/S	16-Apr-2025	4:45:19 PM	39	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:45:19 PM	54	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:45:19 PM	12	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:45:19 PM	27	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:45:19 PM	4	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:45:19 PM	52	1290.50	AQEU
GENMAB A/S	16-Apr-2025	4:45:19 PM	4	1290.50	AQEU
GENMAB A/S	16-Apr-2025	4:45:45 PM	79	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:45:45 PM	2	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:05 PM	6	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:09 PM	3	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:09 PM	3	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:09 PM	13	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:09 PM	5	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:09 PM	7	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:09 PM	7	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:09 PM	3	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:09 PM	4	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:09 PM	8	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:09 PM	4	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:09 PM	25	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:12 PM	90	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:46:12 PM	6	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:12 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:46:12 PM	46	1290.00	AQEU
GENMAB A/S	16-Apr-2025	4:46:35 PM	8	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:46:37 PM	35	1289.50	AQEU
GENMAB A/S	16-Apr-2025	4:47:05 PM	28	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:47:05 PM	61	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:47:11 PM	13	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:47:11 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:47:13 PM	18	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:47:13 PM	46	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:47:13 PM	23	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:47:13 PM	36	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:47:13 PM	8	1290.50	CEUX

210

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:47:13 PM	18	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:47:13 PM	25	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:47:14 PM	13	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:47:14 PM	36	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:47:25 PM	77	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:47:55 PM	89	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:47:55 PM	15	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:47:55 PM	10	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:48:04 PM	22	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:48:04 PM	4	1290.00	TQEX
GENMAB A/S	16-Apr-2025	4:48:04 PM	40	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:48:10 PM	4	1290.00	TQEX
GENMAB A/S	16-Apr-2025	4:48:35 PM	13	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:48:35 PM	79	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:48:39 PM	14	1290.50	TQEX
GENMAB A/S	16-Apr-2025	4:48:39 PM	86	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:48:39 PM	45	1290.50	AQEU
GENMAB A/S	16-Apr-2025	4:48:41 PM	3	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:41 PM	7	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:48:41 PM	86	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:48:48 PM	35	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:48 PM	26	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:48 PM	46	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:48 PM	36	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:48:53 PM	7	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:53 PM	35	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:54 PM	18	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:54 PM	22	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:54 PM	46	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:58 PM	17	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:48:58 PM	46	1290.50	XCSE
GENMAB A/S	16-Apr-2025	4:49:00 PM	15	1290.00	TQEX
GENMAB A/S	16-Apr-2025	4:49:00 PM	15	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:49:15 PM	87	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:49:15 PM	25	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:49:15 PM	3	1289.50	TQEX
GENMAB A/S	16-Apr-2025	4:49:15 PM	39	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:49:15 PM	49	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:49:20 PM	29	1289.50	AQEU
GENMAB A/S	16-Apr-2025	4:49:55 PM	9	1288.50	TQEX
GENMAB A/S	16-Apr-2025	4:49:55 PM	47	1288.50	TQEX
GENMAB A/S	16-Apr-2025	4:49:55 PM	72	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:49:55 PM	21	1288.50	CEUX

211

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:49:58 PM	18	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:50:00 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:05 PM	43	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:05 PM	2	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:05 PM	12	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:50:09 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:09 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:09 PM	36	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:50:09 PM	12	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:50:18 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:18 PM	20	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:18 PM	37	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:50:18 PM	29	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:19 PM	59	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:19 PM	32	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:19 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:19 PM	19	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	3	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	23	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	51	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	19	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:34 PM	30	1287.00	TQEX
GENMAB A/S	16-Apr-2025	4:50:34 PM	44	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	36	1287.50	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	14	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	12	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	6	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	19	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	14	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	6	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:34 PM	6	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:35 PM	25	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:35 PM	8	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:35 PM	36	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:55 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:55 PM	23	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:55 PM	7	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:55 PM	46	1288.00	XCSE

212

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:50:55 PM	45	1287.00	CEUX
GENMAB A/S	16-Apr-2025	4:50:56 PM	19	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	19	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	17	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	19	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	19	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:56 PM	29	1287.50	TQEX
GENMAB A/S	16-Apr-2025	4:50:56 PM	1	1287.50	TQEX
GENMAB A/S	16-Apr-2025	4:50:57 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:58 PM	2	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:58 PM	46	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:50:58 PM	15	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:51:00 PM	19	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:51:00 PM	9	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:51:02 PM	23	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:51:14 PM	1	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:51:14 PM	3	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:51:14 PM	46	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:51:14 PM	19	1289.00	XCSE
GENMAB A/S	16-Apr-2025	4:51:14 PM	21	1288.50	TQEX
GENMAB A/S	16-Apr-2025	4:51:14 PM	7	1288.50	TQEX
GENMAB A/S	16-Apr-2025	4:51:35 PM	89	1288.00	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	26	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	7	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	26	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	16	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	48	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	13	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	15	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:51:35 PM	88	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:51:35 PM	36	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:51:49 PM	13	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:51:49 PM	25	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:51:54 PM	9	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:52:04 PM	17	1290.50	CEUX
GENMAB A/S	16-Apr-2025	4:52:04 PM	49	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:06 PM	26	1290.00	TQEX

213

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:52:06 PM	40	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:06 PM	30	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:06 PM	26	1290.00	AQEU
GENMAB A/S	16-Apr-2025	4:52:08 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:12 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:13 PM	35	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:52:13 PM	3	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:52:13 PM	46	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:52:13 PM	33	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:52:13 PM	1	1290.00	XCSE
GENMAB A/S	16-Apr-2025	4:52:15 PM	3	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:26 PM	40	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:52:26 PM	51	1289.50	XCSE
GENMAB A/S	16-Apr-2025	4:52:26 PM	36	1290.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:26 PM	43	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:52:35 PM	76	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:35 PM	11	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:52:35 PM	27	1289.00	AQEU
GENMAB A/S	16-Apr-2025	4:52:39 PM	26	1289.00	TQEX
GENMAB A/S	16-Apr-2025	4:53:44 PM	8	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:44 PM	36	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:44 PM	43	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:54 PM	9	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:54 PM	52	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:53:54 PM	8	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:53:54 PM	8	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:53:54 PM	25	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:53:54 PM	35	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:53:54 PM	4	1288.00	CEUX
GENMAB A/S	16-Apr-2025	4:53:55 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:55 PM	46	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:55 PM	19	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:55 PM	17	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:55 PM	18	1288.50	XCSE
GENMAB A/S	16-Apr-2025	4:53:56 PM	9	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:54:14 PM	3	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:54:14 PM	30	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:54:14 PM	49	1288.50	CEUX
GENMAB A/S	16-Apr-2025	4:54:14 PM	5	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:54:14 PM	17	1289.00	CEUX
GENMAB A/S	16-Apr-2025	4:54:14 PM	69	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:54:14 PM	14	1288.50	AQEU
GENMAB A/S	16-Apr-2025	4:54:27 PM	19	1289.50	CEUX

214

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for April 14 – April 18, 2025

GENMAB A/S	16-Apr-2025	4:54:27 PM	12	1289.50	CEUX
GENMAB A/S	16-Apr-2025	4:54:33 PM	59	1291.00	XCSE
GENMAB A/S	16-Apr-2025	4:54:41 PM	12	1291.00	XCSE
GENMAB A/S	16-Apr-2025	4:54:42 PM	14	1292.00	XCSE
GENMAB A/S	16-Apr-2025	4:54:42 PM	13	1292.00	CEUX
GENMAB A/S	16-Apr-2025	4:54:42 PM	69	1291.50	CEUX
GENMAB A/S	16-Apr-2025	4:54:42 PM	24	1291.50	CEUX
GENMAB A/S	16-Apr-2025	4:54:43 PM	46	1292.00	XCSE
GENMAB A/S	16-Apr-2025	4:54:43 PM	2	1292.00	XCSE

215

GMAB 6-K