Stocks
MRK Merck & Co., Inc.

MRK

Merck & Co., Inc.

Company with tickers: MRK

CIK

310158

CUSIP

58933Y105

Shares Outstanding

2,472,392,003

Price Holdings Short Volume Short Interest Fails to Deliver SEC Filings Earnings Calls Insider Trading Congress Trades

Date	Insider	Role	Type	Shares	Price	Value	After
2026-03-31	Seidman Christine E	Director	Other	100	—	—	100
2026-03-31	GLOCER THOMAS H	Director	Other	5,100	—	—	5,100
2026-03-31	Coe Mary Ellen	Director	Other	10	—	—	10
2026-02-12	Guindo Chirfi	Chief Marketing Officer	Sell	10,000	$121.46	$1,214,562	60,615
2026-02-10	Li Dean Y	Executive VP & President, MRL	Sell	10,235	$117.52	$1,202,844	92,035
2026-02-09	Guindo Chirfi	Chief Marketing Officer	Sell	10,000	$118.41	$1,184,101	70,615
2026-02-09	Zachary Jennifer	EVP, General Counsel	Sell	25,946	$119.15	$3,091,523	68,915
2026-02-09	Zachary Jennifer	EVP, General Counsel	Convert	25,946	$119.15	$3,091,523	94,861
2026-02-06	Williams David Michael	EVP,Chief Info&Digital Officer	Sell	5,000	$121.91	$609,525	30,837
2026-02-06	Williams David Michael	EVP,Chief Info&Digital Officer	Convert	5,000	$77.62	$388,100	35,837
2026-02-06	Oosthuizen Johannes Jacobus	President, U.S. Market	Sell	15,000	$121.87	$1,827,992	21,197
2026-02-06	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	Sell	37,685	$120.92	$4,557,025	160,173
2026-02-05	Guindo Chirfi	Chief Marketing Officer	Sell	20,000	$121.88	$2,437,676	80,615
2026-02-04	Smart Dalton E. III	SVP Fin. - Global Controller	Sell	4,000	$119.68	$478,700	10,604
2026-02-04	Smart Dalton E. III	SVP Fin. - Global Controller	Convert	4,000	$62.07	$248,280	14,604
2026-02-04	Litchfield Caroline	EVP & CFO	Convert	41,997	$53.06	$2,228,361	132,189
2026-02-04	Litchfield Caroline	EVP & CFO	Sell	41,997	$119.61	$5,023,312	90,192
2026-02-04	Li Dean Y	Executive VP & President, MRL	Convert	15,087	$56.04	$845,475	117,357
2026-02-04	Li Dean Y	Executive VP & President, MRL	Sell	15,087	$118.77	$1,791,824	102,270
2026-02-04	Davis Robert M	Director, Chairman, CEO & President	Sell	14,972	$117.38	$1,757,407	476,063
2026-01-26	Zachary Jennifer	EVP, General Counsel	Award	11,583	$107.40	$1,244,014	68,915
2026-01-26	Williams David Michael	EVP,Chief Info&Digital Officer	Award	6,112	$107.40	$656,429	30,837
2026-01-26	Smart Dalton E. III	SVP Fin. - Global Controller	Award	1,066	$107.40	$114,488	10,604
2026-01-26	Romanelli Joseph	President, Human Health Int?l	Award	5,703	$107.40	$612,502	28,739
2026-01-26	Oosthuizen Johannes Jacobus	President, U.S. Market	Award	5,026	$107.40	$539,792	36,197
2026-01-26	Litchfield Caroline	EVP & CFO	Award	15,852	$107.40	$1,702,505	90,192
2026-01-26	Li Dean Y	Executive VP & President, MRL	Award	20,469	$107.40	$2,198,371	102,270
2026-01-26	Guindo Chirfi	Chief Marketing Officer	Other	56	—	—	56
2026-01-26	Guindo Chirfi	Chief Marketing Officer	Award	9,865	$107.40	$1,059,501	100,615
2026-01-26	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	Award	12,264	$107.40	$1,317,154	197,858
2026-01-26	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	Other	1,312	—	—	1,312
2026-01-26	Davis Robert M	Director, Chairman, CEO & President	Award	47,434	$107.40	$5,094,412	491,035
2026-01-26	Chattopadhyay Sanat	Exe V-P & Pres. MMD	Other	74,289	—	—	74,289
2026-01-26	Chattopadhyay Sanat	Exe V-P & Pres. MMD	Award	13,880	$107.40	$1,490,712	13,880
2025-12-31	Seidman Christine E	Director	Other	100	—	—	100
2025-12-31	GLOCER THOMAS H	Director	Other	5,100	—	—	5,100
2025-12-31	Coe Mary Ellen	Director	Other	10	—	—	10
2025-11-10	Downing Cristal N	Chief Comm. & Public Afrs Ofcr	Sell	7,085	$87.00	$616,395	0
2025-11-03	Williams David Michael	EVP,Chief Info&Digital Officer	Sell	8,614	$83.59	$720,040	24,578
2025-09-30	Seidman Christine E	Director	Other	100	—	—	100
2025-09-30	GLOCER THOMAS H	Director	Other	5,100	—	—	5,100
2025-09-30	Coe Mary Ellen	Director	Other	10	—	—	10
2025-08-04	Williams David Michael	EVP,Chief Info&Digital Officer	Tax	8,432	$79.29	$668,573	33,013
2025-08-04	Williams David Michael	EVP,Chief Info&Digital Officer	Convert	17,119	$79.29	$1,357,366	41,445
2025-08-04	Guindo Chirfi	Chief Marketing Officer	Tax	18,175	$79.29	$1,441,096	89,233
2025-08-04	Guindo Chirfi	Chief Marketing Officer	Convert	36,903	$79.29	$2,926,039	107,408
2025-08-04	Guindo Chirfi	Chief Marketing Officer	Other	55	—	—	55
2025-06-30	Seidman Christine E	Director	Other	100	—	—	100
2025-06-30	GLOCER THOMAS H	Director	Other	5,100	—	—	5,100
2025-06-30	Coe Mary Ellen	Director	Other	10	—	—	10
2025-05-30	Warden Kathy J	Director	Other	500	—	—	500
2025-05-30	THULIN INGE G	Director	Other	2,932	—	—	2,932
2025-05-30	Seidman Christine E	Director	Other	100	—	—	100
2025-05-30	RUSSO PATRICIA F	Director	Other	13,148	—	—	13,148
2025-05-30	Rothman Paul	Director	Other	100	—	—	100
2025-05-30	Mayo Stephen	Director	Other	100	—	—	100
2025-05-30	LAVIZZO-MOUREY RISA J	Director	Other	1,000	—	—	1,000
2025-05-30	Karsanbhai Surendralal Lanca	Director	Other	1	—	—	1
2025-05-30	GLOCER THOMAS H	Director	Other	5,100	—	—	5,100
2025-05-30	Craig Pamela J.	Director	Other	1,715	—	—	1,715
2025-05-30	Coe Mary Ellen	Director	Other	10	—	—	10
2025-05-30	BAKER DOUGLAS M JR	Director	Other	16,000	—	—	16,000
2025-05-03	Smart Dalton E. III	SVP Fin. - Global Controller	Tax	256	$83.18	$21,294	8,594
2025-05-03	Smart Dalton E. III	SVP Fin. - Global Controller	Convert	518	$83.18	$43,087	8,850
2025-05-02	Smart Dalton E. III	SVP Fin. - Global Controller	Convert	381	$83.26	$31,722	8,463
2025-05-02	Smart Dalton E. III	SVP Fin. - Global Controller	Tax	131	$83.26	$10,907	8,332
2025-05-02	Romanelli Joseph	President, Human Health Int?l	Convert	2,262	$83.26	$188,334	24,060
2025-05-02	Romanelli Joseph	President, Human Health Int?l	Tax	1,115	$83.26	$92,835	22,945
2025-04-30	Smart Dalton E. III	SVP Fin. - Global Controller	Convert	464	$84.71	$39,305	8,241
2025-04-30	Smart Dalton E. III	SVP Fin. - Global Controller	Tax	159	$84.71	$13,469	8,082
2025-04-30	Romanelli Joseph	President, Human Health Int?l	Tax	1,017	$84.71	$86,150	21,798
2025-04-30	Romanelli Joseph	President, Human Health Int?l	Convert	2,063	$84.71	$174,757	22,815
2025-04-30	Larson Betty D	EVP, Chief HR Officer	Tax	5,153	$84.71	$436,511	6,197
2025-04-30	Larson Betty D	EVP, Chief HR Officer	Convert	11,350	$84.71	$961,459	11,350
2025-04-29	Smart Dalton E. III	SVP Fin. - Global Controller	Other	7,777	—	—	7,777
2025-04-29	Litchfield Caroline	EVP & CFO	Other	74,340	—	—	74,340
2025-04-29	Williams David Michael	EVP,Chief Info&Digital Officer	Other	24,225	—	—	24,225
2025-04-29	Chattopadhyay Sanat	Exe V-P & Pres. MMD	Other	7,000	—	—	7,000
2025-04-29	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	Other	180,729	—	—	180,729
2025-04-29	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	Other	1,281	—	—	1,281
2025-04-29	Davis Robert M	Director, Chairman, CEO & President	Other	443,601	—	—	443,601
2025-04-29	Oosthuizen Johannes Jacobus	President, U.S. Market	Other	30,829	—	—	30,829
2025-04-29	Li Dean Y	Executive VP & President, MRL	Other	80,180	—	—	80,180
2025-04-29	Zachary Jennifer	EVP, General Counsel	Other	55,831	—	—	55,831
2025-04-29	Downing Cristal N	Chief Comm. & Public Afrs Ofcr	Other	7,085	—	—	7,085
2025-04-29	Larson Betty D	EVP, Chief HR Officer	Other	6,197	—	—	6,197
2025-04-29	Guindo Chirfi	Chief Marketing Officer	Other	55	—	—	55
2025-04-29	Guindo Chirfi	Chief Marketing Officer	Other	69,826	—	—	69,826
2025-04-29	Romanelli Joseph	President, Human Health Int?l	Other	21,798	—	—	21,798
2025-04-25	Smart Dalton E. III	SVP Fin. - Global Controller	Sell	4,262	$82.76	$352,723	7,777
2025-04-25	Smart Dalton E. III	SVP Fin. - Global Controller	Convert	5,000	$58.08	$290,400	12,039
2025-03-31	Seidman Christine E	Director	Other	100	—	—	100
2025-03-31	GLOCER THOMAS H	Director	Other	5,100	—	—	5,100
2025-03-31	Coe Mary Ellen	Director	Other	10	—	—	10
2025-02-19	Oosthuizen Johannes Jacobus	President, U.S. Market	Sell	8,500	$84.09	$714,745	30,705
2025-02-13	Williams David Michael	EVP,Chief Info&Digital Officer	Sell	6,000	$85.34	$512,057	24,123
2025-02-08	Oosthuizen Johannes Jacobus	President, U.S. Market	Tax	6,404	$87.28	$558,941	39,205
2025-02-08	Oosthuizen Johannes Jacobus	President, U.S. Market	Convert	13,002	$87.28	$1,134,815	45,609
2025-02-06	THULIN INGE G	Director	Buy	2,832	$88.25	$249,924	2,932
2025-02-06	Downing Cristal N	Chief Comm. & Public Afrs Ofcr	Sell	2,361	$88.76	$209,551	7,085