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 0.05%Institutions 83.76%3,754 filers

Top Institutions

Form 4 Transactions

50 most recent

Date	Insider	Title	Code	Shares	Price	Value
Aug 13, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	S	10,000	$135.0000	$1.35M
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	13,433	$0.0000	$0.00
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	41,494	$0.0000	$0.00
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	S	80,315	$133.4557	$10.72M
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	13,433	$84.7100	$1.14M
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	41,494	$117.8900	$4.89M
Aug 12, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	600	$132.0367	$79.22K
Aug 12, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	11,099	$131.6128	$1.46M
Aug 11, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	5,427	$132.3496	$718.26K
Aug 11, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	7,410	$131.3313	$973.16K
Aug 10, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	20,784	$130.4345	$2.71M
Aug 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	300	$131.0233	$39.31K
Aug 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	4,945	$130.2312	$643.99K
Aug 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	805	$131.0216	$105.47K
Aug 6, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	S	15,000	$131.0000	$1.97M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	34,705	$0.0000	$0.00
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	13,542	$0.0000	$0.00
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	4,600	$0.0000	$0.00
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	S	34,705	$128.7707	$4.47M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	34,705	$73.7300	$2.56M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	S	13,542	$128.7707	$1.74M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	13,542	$75.3600	$1.02M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	S	4,600	$128.7707	$592.35K
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	4,600	$77.6200	$357.05K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	2,686	$0.0000	$0.00
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	9,709	$0.0000	$0.00
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	6,311	$0.0000	$0.00
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	S	2,686	$128.7179	$345.74K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	2,686	$84.7100	$227.53K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	S	9,709	$128.7179	$1.25M
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	9,709	$87.1000	$845.65K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	S	6,311	$128.7179	$812.34K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	6,311	$73.7300	$465.31K
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

Insider Trades & Whales

Ownership Breakdown

Insiders 0.05%Institutions 83.76%3,754 filers

Top Institutions

Form 4 Transactions

50 most recent

Date	Insider	Title	Code	Shares	Price	Value
Aug 13, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	S	10,000	$135.0000	$1.35M
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	13,433	$0.0000	$0.00
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	41,494	$0.0000	$0.00
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	S	80,315	$133.4557	$10.72M
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	13,433	$84.7100	$1.14M
Aug 12, 2026	Zachary Jennifer	EVP, General Counsel	M	41,494	$117.8900	$4.89M
Aug 12, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	600	$132.0367	$79.22K
Aug 12, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	11,099	$131.6128	$1.46M
Aug 11, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	5,427	$132.3496	$718.26K
Aug 11, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	7,410	$131.3313	$973.16K
Aug 10, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	20,784	$130.4345	$2.71M
Aug 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	300	$131.0233	$39.31K
Aug 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	4,945	$130.2312	$643.99K
Aug 6, 2026	DeLuca Richard R.	EVP&Pres, Merck Animal Heallth	S	805	$131.0216	$105.47K
Aug 6, 2026	Guindo Chirfi	EVP, Access, Policy & Comms	S	15,000	$131.0000	$1.97M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	34,705	$0.0000	$0.00
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	13,542	$0.0000	$0.00
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	4,600	$0.0000	$0.00
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	S	34,705	$128.7707	$4.47M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	34,705	$73.7300	$2.56M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	S	13,542	$128.7707	$1.74M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	13,542	$75.3600	$1.02M
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	S	4,600	$128.7707	$592.35K
Aug 5, 2026	Williams David Michael	EVP,Chief Info&Digital Officer	M	4,600	$77.6200	$357.05K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	2,686	$0.0000	$0.00
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	9,709	$0.0000	$0.00
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	6,311	$0.0000	$0.00
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	S	2,686	$128.7179	$345.74K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	2,686	$84.7100	$227.53K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	S	9,709	$128.7179	$1.25M
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	9,709	$87.1000	$845.65K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	S	6,311	$128.7179	$812.34K
Aug 5, 2026	Maraldo David R.	EVP & Pres. MMD	M	6,311	$73.7300	$465.31K
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