MRK

Merck & Co., Inc.

A maker of prescription medicines and animal health products, Merck produces well-known drugs like the cancer treatment Keytruda and the HPV vaccine Gardasil, along with livestock and pet-care vaccines used by doctors, veterinarians, and farmers. Founded in 1891 as the American branch of a German family firm, the company was seized during World War I and later bought back, becoming an independent U.S. company that today goes by the name MSD outside North America. A fun quirk: its blockbuster Keytruda nearly got shelved — researchers originally set out to calm the immune system, not fight cancer.

CUSIP: 58933Y105HealthcareDE11 holders

Nov 3, 2009 — Created from Merck & Co., Inc. in a merger (1:1)

Ownership Activity Financials Filings

Insiders

Ranked by how much each holding moved in the last 5 years

Insider

Frazier Kenneth CExecutive Chair, Director · 32 transactions

1.65M+39.7%

as of Nov 2022

Granted 2.96M · Sold 2.84M

Davis Robert MChairman, CEO & President, Director · 21 transactions

450.4K+106.9%

Granted 832.6K · Sold 593.4K

DeLuca Richard R.EVP&Pres, Merck Animal Heallth · 23 transactions

325.7K+40.8%

Granted 593.6K · Sold 552.9K

Chattopadhyay SanatExe V-P & Pres. MMD · 23 transactions

258.3K—

Granted 451.6K · Sold 343.0K

Clyburn FrankEVP & Pres ? Human Health · 5 transactions

138.6K+44.3%

as of Nov 2021

Granted 42.1K · Sold 39.8K

Guindo ChirfiEVP, Access, Policy & Comms · 13 transactions

124.3K—

Granted 150.7K · Sold 40.0K

Li Dean YExecutive VP & President, MRL · 18 transactions

94.4K+652.6%

Granted 122.6K · Sold 40.0K

Litchfield CarolineEVP & CFO · 19 transactions

92.3K+367.6%

Granted 173.0K · Sold 98.6K

Mizell StevenEVP, Chief HR Officer · 28 transactions

74.3K+220.6%

as of Feb 2024

Granted 186.9K · Sold 184.1K

Zachary JenniferEVP, General Counsel · 23 transactions

70.9K+107.7%

Granted 462.4K · Sold 430.9K

Klobuchar Michael AEVP - Chief Strategy Officer · 15 transactions

49.5K—

as of May 2024

Granted 14.7K

Gerberding Julie L.EVP, Chief Patient Officer · 6 transactions

48.7K+24.4%

as of Feb 2022

Granted 105.8K · Sold 96.3K

Maraldo David R.EVP & Pres. MMD · 2 transactions

44.9K—

Granted 552

Karachun Rita ASr. VP Fince-Global Controller · 21 transactions

44.6K+24.5%

as of May 2023

Granted 84.7K · Sold 72.9K

Williams David MichaelEVP,Chief Info&Digital Officer · 26 transactions

31.7K+474.7%

Granted 63.5K · Sold 28.6K

Romanelli JosephPresident, Human Health Int?l · 20 transactions

28.7K—

Granted 12.3K · Bought 409 · Sold 6.1K

Oosthuizen Johannes JacobusEVP, Oncology & Int?l · 38 transactions

21.9K—

Granted 114.0K · Sold 95.5K

Baker Douglas M JrDirector · 1 transaction

16.0K—

Bought 15.0K

Larson Betty DEVP, Chief HR Officer · 6 transactions

13.8K—

Granted 24.8K

Smart Dalton E. IIISVP Fin. - Global Controller · 20 transactions

9.4K—

Granted 14.8K · Sold 10.7K

Smart DaltonSVP Fin. - Global Controller · 10 transactions

7.0K—

as of Jan 2025

Granted 8.3K

LeCointe-Cephas LisaSVP Chief Ethics & Com Officer · 12 transactions

4.2K+59%

as of May 2023

Granted 4.0K

Thulin Inge GDirector · 1 transaction

2.9K+2832.9%

Bought 2.8K

Garay ArpaSVP Human Health Global Mktg. · 6 transactions

2.4K—

as of May 2022

Granted 2.5K

Downing Cristal NChief Comm. & Public Afrs Ofcr · 3 transactions

0—

Granted 9.4K · Sold 9.4K

Insider	Stake change	Holds now	Granted / vested	Bought	Sold
Frazier Kenneth CExecutive Chair, Director · 32 transactions	+39.7%	1.65Mas of Nov 2022	2.96M	—	2.84M
Davis Robert MChairman, CEO & President, Director · 21 transactions	+106.9%	450.4K	832.6K	—	593.4K
DeLuca Richard R.EVP&Pres, Merck Animal Heallth · 23 transactions	+40.8%	325.7K	593.6K	—	552.9K
Chattopadhyay SanatExe V-P & Pres. MMD · 23 transactions	—	258.3K	451.6K	—	343.0K
Clyburn FrankEVP & Pres ? Human Health · 5 transactions	+44.3%	138.6Kas of Nov 2021	42.1K	—	39.8K
Guindo ChirfiEVP, Access, Policy & Comms · 13 transactions	—	124.3K	150.7K	—	40.0K
Li Dean YExecutive VP & President, MRL · 18 transactions	+652.6%	94.4K	122.6K	—	40.0K
Litchfield CarolineEVP & CFO · 19 transactions	+367.6%	92.3K	173.0K	—	98.6K
Mizell StevenEVP, Chief HR Officer · 28 transactions	+220.6%	74.3Kas of Feb 2024	186.9K	—	184.1K
Zachary JenniferEVP, General Counsel · 23 transactions	+107.7%	70.9K	462.4K	—	430.9K
Klobuchar Michael AEVP - Chief Strategy Officer · 15 transactions	—	49.5Kas of May 2024	14.7K	—	—
Gerberding Julie L.EVP, Chief Patient Officer · 6 transactions	+24.4%	48.7Kas of Feb 2022	105.8K	—	96.3K
Maraldo David R.EVP & Pres. MMD · 2 transactions	—	44.9K	552	—	—
Karachun Rita ASr. VP Fince-Global Controller · 21 transactions	+24.5%	44.6Kas of May 2023	84.7K	—	72.9K
Williams David MichaelEVP,Chief Info&Digital Officer · 26 transactions	+474.7%	31.7K	63.5K	—	28.6K
Romanelli JosephPresident, Human Health Int?l · 20 transactions	—	28.7K	12.3K	409	6.1K
Oosthuizen Johannes JacobusEVP, Oncology & Int?l · 38 transactions	—	21.9K	114.0K	—	95.5K
Baker Douglas M JrDirector · 1 transaction	—	16.0K	—	15.0K	—
Larson Betty DEVP, Chief HR Officer · 6 transactions	—	13.8K	24.8K	—	—
Smart Dalton E. IIISVP Fin. - Global Controller · 20 transactions	—	9.4K	14.8K	—	10.7K
Smart DaltonSVP Fin. - Global Controller · 10 transactions	—	7.0Kas of Jan 2025	8.3K	—	—
LeCointe-Cephas LisaSVP Chief Ethics & Com Officer · 12 transactions	+59%	4.2Kas of May 2023	4.0K	—	—
Thulin Inge GDirector · 1 transaction	+2832.9%	2.9K	—	2.8K	—
Garay ArpaSVP Human Health Global Mktg. · 6 transactions	—	2.4Kas of May 2022	2.5K	—	—
Downing Cristal NChief Comm. & Public Afrs Ofcr · 3 transactions	—	0	9.4K	—	9.4K

Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.