MERCK & CO. INC. (MRK) Institutional Ownership Changes & 13F Activity

MERCK & CO. INC. (MRK) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Kahn Brothers Group, Causeway Capital Management, Sequoia Financial Advisors, Cullen Value Fund, and Dodge & Cox Stock Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2023Gardner Russo & QuinnBuy1293,960$456,921
Q2 2023Semper Augustus Investments GroupSell-2944,444$5,128,393
Q2 2023Matrix Private Capital GroupSell-118,502$987,297
Q1 2023Renaissance Technologies LLCBuy969,1572,649,259$281,855
Q1 2023Sequoia Financial AdvisorsSell-57,332118,180$12,573,167
Q1 2023Sound Shore ManagementBuy10,601669,280$71,204,699
Q1 2023Kahn Brothers GroupSell-10,159671,604$71,452,223
Q1 2023Mairs & Power Growth FundSell-6,22967,237$7,153,344
Q1 2023Dodge & Cox Stock FundSell-2,025173,206$18,427,386
Q1 2023Gardner Russo & QuinnBuy1583,831$407,612
Q1 2023Matrix Advisors Value FundSell-1504,025$428,220
Q1 2023Matrix Private Capital GroupSell-888,513$911,810
Q4 2022Renaissance Technologies LLCSell-2,883,1321,680,102$186,407
Q4 2022Parnassus Endeavor FundSell-374,8411,931,707$214,322,892
Q4 2022Sequoia Financial AdvisorsBuy48,199175,512$19,473,095
Q4 2022Dodge & Cox Stock FundSell-14,100175,231$19,441,879
Q4 2022Sound Shore ManagementSell-9,479658,679$73,080,435
Q4 2022Kahn Brothers GroupSell-2,492681,763$75,641,652
Q4 2022Mairs & Power Growth FundSell-1,66673,466$8,151,053
Q4 2022Matrix Advisors Value FundSell-6904,175$463,216
Q4 2022Gardner Russo & QuinnSell-1853,673$407,517
Q4 2022Matrix Private Capital GroupSell-78,601$960,560
Q3 2022Renaissance Technologies LLCSell-2,200,7004,563,234$392,986
Q3 2022Hillman Value FundSell-31,40766,707$5,745
Q3 2022Mairs & Power Growth FundBuy18,28975,132$6,470
Q3 2022Kahn Brothers GroupSell-14,769684,255$58,583,183
Q3 2022Sound Shore ManagementBuy5,644668,158$57,542
Q3 2022Dodge & Cox Stock FundSell-3,500189,331$16,305
Q3 2022Matrix Private Capital GroupSell-2,2998,608$747
Q3 2022Sequoia Financial AdvisorsSell-1,218127,313$10,964

Frequently asked questions about MRK activity

  • Which institutional owners are buying MRK?

    Institutional owners buying MRK include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MRK activity?

    "Buy" means an investor increased their reported position in MRK compared to the prior reporting period. This reflects growing exposure to MERCK & CO. INC. (MRK) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MRK increasing?

    Institutional interest in MRK can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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