Insider Trades & Whales

Insider trades are parsed from SEC Form 4 filings (first-party). The ownership breakdown below is computed first-hand from SEC 13F-HR + Form 4 (institutions from 13F, insiders from Form 4). For the full filer list and quarter-over-quarter position changes, see the Institutional (13F) tab.

Ownership Breakdown

Insiders 0.08%Institutions 78.36%3,705 filers

Top Institutions

Form 4 Transactions

50 most recent

Date	Insider	Title	Code	Shares	Price	Value
Jun 30, 2026	Coe Mary Ellen	Director	A	233	$128.5000	$29.94K
Jun 30, 2026	Karsanbhai Surendralal Lanca	Director	A	126	$128.5000	$16.19K
Jun 30, 2026	Seidman Christine E	Director	A	63	$128.5000	$8.10K
May 29, 2026	BAKER DOUGLAS M JR	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Craig Pamela J.	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	GLOCER THOMAS H	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	LAVIZZO-MOUREY RISA J	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Mayo Stephen	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Rothman Paul	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	RUSSO PATRICIA F	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Seidman Christine E	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	THULIN INGE G	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Coe Mary Ellen	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Karsanbhai Surendralal Lanca	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Warden Kathy J	Director	A	1,853	$118.7200	$219.99K
May 5, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	A	19,402	$0.0000	$0.00
May 5, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	A	6,628	$0.0000	$0.00
May 5, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	A	5,045	$0.0000	$0.00
May 5, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	A	2,298	$0.0000	$0.00
May 5, 2026	Maraldo David R.	EVP & Pres. MMD	A	21,731	$0.0000	$0.00
May 5, 2026	Maraldo David R.	EVP & Pres. MMD	A	7,424	$0.0000	$0.00
May 5, 2026	Oosthuizen Johannes Jacobus	EVP, Oncology & Int?l	A	31,044	$0.0000	$0.00
May 5, 2026	Oosthuizen Johannes Jacobus	EVP, Oncology & Int?l	A	10,605	$0.0000	$0.00
May 5, 2026	Foard Brian	EVP, Specialty, Pharma, & ID	A	31,044	$0.0000	$0.00
May 5, 2026	Foard Brian	EVP, Specialty, Pharma, & ID	A	35,351	$0.0000	$0.00
May 5, 2026	Foard Brian	EVP, Specialty, Pharma, & ID	A	10,605	$0.0000	$0.00
May 5, 2026	Davis Robert M	Chairman, CEO & President	A	139,697	$0.0000	$0.00
May 5, 2026	Davis Robert M	Chairman, CEO & President	A	47,724	$0.0000	$0.00
May 5, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	A	34,924	$0.0000	$0.00
May 5, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	A	11,931	$0.0000	$0.00
May 5, 2026	Larson Betty D	EVP, Chief HR Officer	A	23,283	$0.0000	$0.00
May 5, 2026	Larson Betty D	EVP, Chief HR Officer	A	7,954	$0.0000	$0.00
May 5, 2026	Li Dean Y	Executive VP & President, MRL	A	58,207	$0.0000	$0.00
May 5, 2026	Li Dean Y	Executive VP & President, MRL	A	19,885	$0.0000	$0.00
May 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	A	13,582	$0.0000	$0.00
May 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	A	4,640	$0.0000	$0.00
May 5, 2026	Litchfield Caroline	EVP & CFO	A	46,566	$0.0000	$0.00
May 5, 2026	Litchfield Caroline	EVP & CFO	A	15,908	$0.0000	$0.00
May 5, 2026	Zachary Jennifer	EVP, General Counsel	A	35,312	$0.0000	$0.00
May 5, 2026	Zachary Jennifer	EVP, General Counsel	A	12,064	$0.0000	$0.00
May 2, 2026	Maraldo David R.	EVP & Pres. MMD	M	552	$0.0000	$0.00
May 2, 2026	Maraldo David R.	EVP & Pres. MMD	F	159	$112.1600	$17.83K
May 2, 2026	Maraldo David R.	EVP & Pres. MMD	M	552	$112.1600	$61.91K
May 2, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	M	383	$0.0000	$0.00
May 2, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	F	132	$112.1600	$14.80K
May 2, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	M	383	$112.1600	$42.96K
Apr 30, 2026	Larson Betty D	EVP, Chief HR Officer	M	11,350	$0.0000	$0.00
Apr 30, 2026	Larson Betty D	EVP, Chief HR Officer	F	5,143	$110.9500	$570.62K
Apr 30, 2026	Larson Betty D	EVP, Chief HR Officer	M	11,350	$110.9500	$1.26M
Apr 30, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	M	464	$0.0000	$0.00

Insider Trades & Whales

Ownership Breakdown

Insiders 0.08%Institutions 78.36%3,705 filers

Top Institutions

Form 4 Transactions

50 most recent

Date	Insider	Title	Code	Shares	Price	Value
Jun 30, 2026	Coe Mary Ellen	Director	A	233	$128.5000	$29.94K
Jun 30, 2026	Karsanbhai Surendralal Lanca	Director	A	126	$128.5000	$16.19K
Jun 30, 2026	Seidman Christine E	Director	A	63	$128.5000	$8.10K
May 29, 2026	BAKER DOUGLAS M JR	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Craig Pamela J.	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	GLOCER THOMAS H	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	LAVIZZO-MOUREY RISA J	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Mayo Stephen	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Rothman Paul	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	RUSSO PATRICIA F	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Seidman Christine E	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	THULIN INGE G	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Coe Mary Ellen	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Karsanbhai Surendralal Lanca	Director	A	1,853	$118.7200	$219.99K
May 29, 2026	Warden Kathy J	Director	A	1,853	$118.7200	$219.99K
May 5, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	A	19,402	$0.0000	$0.00
May 5, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	A	6,628	$0.0000	$0.00
May 5, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	A	5,045	$0.0000	$0.00
May 5, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	A	2,298	$0.0000	$0.00
May 5, 2026	Maraldo David R.	EVP & Pres. MMD	A	21,731	$0.0000	$0.00
May 5, 2026	Maraldo David R.	EVP & Pres. MMD	A	7,424	$0.0000	$0.00
May 5, 2026	Oosthuizen Johannes Jacobus	EVP, Oncology & Int?l	A	31,044	$0.0000	$0.00
May 5, 2026	Oosthuizen Johannes Jacobus	EVP, Oncology & Int?l	A	10,605	$0.0000	$0.00
May 5, 2026	Foard Brian	EVP, Specialty, Pharma, & ID	A	31,044	$0.0000	$0.00
May 5, 2026	Foard Brian	EVP, Specialty, Pharma, & ID	A	35,351	$0.0000	$0.00
May 5, 2026	Foard Brian	EVP, Specialty, Pharma, & ID	A	10,605	$0.0000	$0.00
May 5, 2026	Davis Robert M	Chairman, CEO & President	A	139,697	$0.0000	$0.00
May 5, 2026	Davis Robert M	Chairman, CEO & President	A	47,724	$0.0000	$0.00
May 5, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	A	34,924	$0.0000	$0.00
May 5, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	A	11,931	$0.0000	$0.00
May 5, 2026	Larson Betty D	EVP, Chief HR Officer	A	23,283	$0.0000	$0.00
May 5, 2026	Larson Betty D	EVP, Chief HR Officer	A	7,954	$0.0000	$0.00
May 5, 2026	Li Dean Y	Executive VP & President, MRL	A	58,207	$0.0000	$0.00
May 5, 2026	Li Dean Y	Executive VP & President, MRL	A	19,885	$0.0000	$0.00
May 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	A	13,582	$0.0000	$0.00
May 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	A	4,640	$0.0000	$0.00
May 5, 2026	Litchfield Caroline	EVP & CFO	A	46,566	$0.0000	$0.00
May 5, 2026	Litchfield Caroline	EVP & CFO	A	15,908	$0.0000	$0.00
May 5, 2026	Zachary Jennifer	EVP, General Counsel	A	35,312	$0.0000	$0.00
May 5, 2026	Zachary Jennifer	EVP, General Counsel	A	12,064	$0.0000	$0.00
May 2, 2026	Maraldo David R.	EVP & Pres. MMD	M	552	$0.0000	$0.00
May 2, 2026	Maraldo David R.	EVP & Pres. MMD	F	159	$112.1600	$17.83K
May 2, 2026	Maraldo David R.	EVP & Pres. MMD	M	552	$112.1600	$61.91K
May 2, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	M	383	$0.0000	$0.00
May 2, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	F	132	$112.1600	$14.80K
May 2, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	M	383	$112.1600	$42.96K
Apr 30, 2026	Larson Betty D	EVP, Chief HR Officer	M	11,350	$0.0000	$0.00
Apr 30, 2026	Larson Betty D	EVP, Chief HR Officer	F	5,143	$110.9500	$570.62K
Apr 30, 2026	Larson Betty D	EVP, Chief HR Officer	M	11,350	$110.9500	$1.26M
Apr 30, 2026	Smart Dalton E. III	SVP Fin. - Global Controller	M	464	$0.0000	$0.00