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Merck & Co. MRK

Merck & Co. is the 29th largest S&P 500 company by market cap, worth $358 billion. 13 directors have filed with the SEC in the last 12 months (who counts), 1 of them an executive. 15 other officers are on file. At 30 Jun 2026, Vanguard was its largest institutional holder, with 10.3% of the company.

Chair and CEO
Robert M. Davis
Sector
Health Care
Sub-industry
Pharmaceuticals
Headquarters
Kenilworth, New Jersey
Founded
1891
More
Wikipedia
Market cap
$358B
29th largest, 23 Oct 2026 close
Revenue
$65.0B
Fiscal year 2025
Price to sales
5.5
Market cap over revenue
Employees
75,000
10-K, 31 Dec 2025
Market cap per employee
$4.8M
Market cap over employees
Connections
13
S&P 500 companies sharing a director or officer

Largest institutional holders

Each fund group's share of Merck & Co.. Where a company has several share classes, the share is of its total value.

13F filings for the quarter to 30 Jun 2026

These five hold 30.4% of Merck & Co..

Source: SEC Form 13F data sets, SEC XBRL shares outstanding 路 All holders

Board and officers

10 people here also hold roles at other S&P 500 companies.

Roles filed up to 30 Sep 2026

NameTitle
Directors (13)
Robert M. DavisChairman, CEO & PresidentAlso at Duke EnergyChairman, CEO & President
Douglas M. Baker Jr.DirectorAlso at TargetDirector
Mary Ellen CoeDirectorDirector
Pamela J. CraigDirectorAlso at Corning and ProgressiveDirector
Thomas H. GlocerDirectorAlso at Morgan StanleyDirector
Surendralal Lanca KarsanbhaiDirectorAlso at Emerson ElectricDirector
Risa J. Lavizzo-MoureyDirectorDirector
Stephen MayoDirectorDirector
Paul RothmanDirectorAlso at LabcorpDirector
Patricia F. RussoDirectorAlso at General Motors, Hewlett Packard Enterprise and KKR & Co.Director
Christine E. SeidmanDirectorDirector
Inge G. ThulinDirectorDirector
Kathy J. WardenDirectorAlso at Northrop GrummanDirector
Officers (15)
Caroline LitchfieldEVP & CFOAlso at VerizonLast filed 7 May 2026EVP & CFO
Sanat ChattopadhyayExe V-P & Pres. MMDLast filed 1 May 2026Exe V-P & Pres. MMD
Richard R. DeLucaEVP&Pres, Merck Animal HeallthLast filed 12 Aug 2026EVP&Pres, Merck Animal Heallth
Cristal N. DowningChief Comm. & Public Afrs OfcrLast filed 12 Nov 2025Chief Comm. & Public Afrs Ofcr
Brian FoardEVP, Specialty, Pharma, & IDLast filed 7 May 2026EVP, Specialty, Pharma, & ID
Chirfi GuindoEVP, Access, Policy & CommsLast filed 13 Aug 2026EVP, Access, Policy & Comms
Gaurav K. GuptaEVP, CIDOLast filed 1 Sep 2026EVP, CIDO
Betty D. LarsonEVP, Chief HR OfficerLast filed 7 May 2026EVP, Chief HR Officer
Dean Y. LiExecutive VP & President, MRLLast filed 7 May 2026Executive VP & President, MRL
David R. MaraldoEVP & Pres. MMDLast filed 7 Aug 2026EVP & Pres. MMD
Johannes Jacobus OosthuizenEVP, Oncology & Int?lLast filed 7 May 2026EVP, Oncology & Int?l
Joseph RomanelliPresident, Human Health Int?lAlso at Kimberly-ClarkLast filed 28 Jan 2026President, Human Health Int?l
Dalton E. Smart IIISVP Fin. - Global ControllerLast filed 7 May 2026SVP Fin. - Global Controller
David Michael WilliamsEVP,Chief Info&Digital OfficerLast filed 7 Aug 2026EVP,Chief Info&Digital Officer
Jennifer ZacharyEVP, General CounselLast filed 13 Aug 2026EVP, General Counsel

Source: SEC insider filings (Forms 3, 4 and 5), Merck & Co.'s Form 4 filings 路 All directors and officers

Companies that share people with Merck & Co.

Each person's title here, then at the other company.

  • Corning GLW
    • Pamela J. Craig: Director here, Director there
  • Duke Energy DUK
    • Robert M. Davis: Chairman, CEO & President here, Director there
  • Emerson Electric EMR
    • Surendralal Lanca Karsanbhai: Director here, President & CEO there
  • General Motors GM
    • Patricia F. Russo: Director here, Director there
  • Hewlett Packard Enterprise HPE
    • Patricia F. Russo: Director here, Director there
  • Kimberly-Clark KMB
    • Joseph Romanelli: President, Human Health Int?l here, Director there
  • KKR & Co. KKR
    • Patricia F. Russo: Director here, Director there
  • Labcorp LH
    • Paul Rothman: Director here, Director there
  • Morgan Stanley MS
    • Thomas H. Glocer: Director here, Director there
  • Northrop Grumman NOC
    • Kathy J. Warden: Director here, Chair, CEO and President there
  • Progressive PGR
    • Pamela J. Craig: Director here, Director there
  • Target TGT
    • Douglas M. Baker Jr.: Director here, Director there
  • Verizon VZ
    • Caroline Litchfield: EVP & CFO here, Director there

Source: SEC insider filings 路 See the whole network

Merck & Co.'s market cap since December 2008

Marked weeks are changes in the share count, such as a merger, not market moves.

Weekly, up to 23 Oct 2026

Show equal percentage changes as equal steps.
201020122014201620182020202220242026$358B

Source: Yahoo Finance closing prices, SEC XBRL shares outstanding

Workforce

Headcount at 31 Dec 2025

Employees
75,000
In the US
30,000
Who is counted
Includes approximately 30,000 U.S. employees.
As of December 31, 2025, the Company had approximately 75,000 employees worldwide, including approximately 30,000 people in the U.S., including Puerto Rico, and approximately 15,000 third-party contractors globally.
Merck & Co. Form 10-K

Source: Merck & Co. Form 10-K

Insider trades

Open-market buys and sales by directors and officers. Grants, option exercises and shares withheld for tax are left out.

Trades from 30 Sep 2025 to 30 Sep 2026

Directors and officers sold $72.0 million of stock in 23 sales and made no open-market purchases in the 12 months to 30 Sep 2026.

DatePersonTitleTypeSharesValue
13 Aug 2026SaleChirfi GuindoEVP, Access, Policy & CommsEVP, Access, Policy & CommsSale10,000$1.4M
12 Aug 2026SaleJennifer ZacharyEVP, General CounselEVP, General CounselSale80,315$11M
12 Aug 2026SaleRichard R. DeLucaEVP&Pres, Merck Animal HeallthEVP&Pres, Merck Animal HeallthSale11,699$1.5M
11 Aug 2026SaleRichard R. DeLucaEVP&Pres, Merck Animal HeallthEVP&Pres, Merck Animal HeallthSale12,837$1.7M
10 Aug 2026SaleRichard R. DeLucaEVP&Pres, Merck Animal HeallthEVP&Pres, Merck Animal HeallthSale20,784$2.7M
6 Aug 2026SaleChirfi GuindoEVP, Access, Policy & CommsEVP, Access, Policy & CommsSale15,000$2.0M
6 Aug 2026SaleRichard R. DeLucaEVP&Pres, Merck Animal HeallthEVP&Pres, Merck Animal HeallthSale6,050$789K
5 Aug 2026SaleDavid Michael WilliamsEVP,Chief Info&Digital OfficerEVP,Chief Info&Digital OfficerSale52,847$6.8M
5 Aug 2026SaleDavid R. MaraldoEVP & Pres. MMDEVP & Pres. MMDSale18,706$2.4M
12 Feb 2026SaleChirfi GuindoEVP, Access, Policy & CommsEVP, Access, Policy & CommsSale10,000$1.2M

Showing 10 of 23 trades

Source: SEC insider transactions data sets, Merck & Co.'s Form 4 filings

Trades by members of Congress and officials

Trades members of Congress and senior executive branch officials disclosed, including their families'. Amounts are filed as ranges.

Trades from 20 Oct 2023 to 20 Oct 2026

28 people disclosed 47 purchases and 48 sales of Merck & Co. stock since October 2023.

DateMember or officialTypeAmount
24 Sep 2026Maria Elvira Salazar (House, R-FL)House, R-FL 路 SoldSale$1,001 to $15,000$1K to $15K
19 Aug 2026Maria Elvira Salazar (House, R-FL)House, R-FL 路 BoughtPurchase$15,001 to $50,000$15K to $50K
23 Jun 2026Donald J Trump (President)President 路 BoughtPurchase$1,001 to $15,000$1K to $15K
12 Jun 2026Donald J Trump (President)President 路 BoughtPurchase$50,001 to $100,000$50K to $100K
18 May 2026Donald J Trump (President)President 路 SoldSale$1,001 to $15,000$1K to $15K
5 May 2026Donald J Trump (President)President 路 SoldSale$15,001 to $50,000$15K to $50K
27 Apr 2026Donald J Trump (President)President 路 SoldSale$50,001 to $100,000$50K to $100K
10 Apr 2026Donald J Trump (President)President 路 SoldSale$1,001 to $15,000$1K to $15K
27 Mar 2026Alan Armstrong (Senate, R-OK)Senate, R-OK 路 SoldSale$15,001 to $50,000$15K to $50K
23 Mar 2026Donald J Trump (President)President 路 BoughtPurchase$1,001 to $15,000$1K to $15K

Showing 10 of 95 trades

Source: House, Senate and OGE disclosures via the Congress trading monitor

WARN layoff notices

Notices filed under Merck & Co.'s own name. Subsidiaries that file under their own names are not included.

Notices from 26 Oct 2023 to 26 Oct 2026

Merck & Co. filed 5 notices covering 368 workers since October 2023.

NoticePlaceWorkersEffective
1 Sep 2026Rahway, NJ5411 Dec 2026
1 Jun 2026Rahway, NJ884 Sep 2026
1 Aug 2025Rahway, NJ5814 Nov 2025
1 Mar 2025C Riverside, PA16316 May 2026
15 Mar 2024PA515 Mar 2024

Source: State WARN notices via the US layoffs tracker