MERCK & CO. INC. (MRK) Stock Institutional Trading Activity


MERCK & CO. INC. (MRK) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Causeway Capital Management, Cullen Value Fund, Kahn Brothers Group, Matrix Private Capital Group, and Mairs & Power Growth Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2023Sound Shore ManagementSell-47,452703,293$72,404,015
Q3 2023Dodge & Cox Stock FundSell-6,650163,795$16,862,695
Q3 2023Renaissance Technologies LLCSell-600,509367,643$37,849
Q3 2023Matrix Advisors Value FundSell-5893,256$335,205
Q3 2023Matrix Private Capital GroupBuy18,503$881,599
Q3 2023Bill & Melinda Gates Foundation TrustBuy17,74017,740$1,826,333
Q3 2023Sequoia Financial AdvisorsBuy1,23958,254$6,004,548
Q3 2023Mairs & Power Growth FundSell-38859,345$6,109,568
Q3 2023Gardner Russo & QuinnSell-1183,842$395,547
Q2 2023Kahn Brothers GroupSell-22,933648,671$74,849,897
Q2 2023Sound Shore ManagementBuy81,465750,745$86,628,466
Q2 2023Dodge & Cox Stock FundSell-2,761170,445$19,667,649
Q2 2023Renaissance Technologies LLCSell-1,681,107968,152$111,715
Q2 2023Matrix Advisors Value FundSell-1803,845$443,675
Q2 2023Matrix Private Capital GroupSell-118,502$987,297
Q2 2023Semper Augustus Investments GroupSell-2944,444$5,128,393
Q2 2023Sequoia Financial AdvisorsSell-61,16557,015$6,586,467
Q2 2023Mairs & Power Growth FundSell-7,50459,733$6,892,591
Q2 2023Parnassus Endeavor FundSell-593,7371,337,970$154,388,358
Q2 2023Gardner Russo & QuinnBuy1293,960$456,921
Q1 2023Kahn Brothers GroupSell-10,159671,604$71,452,223
Q1 2023Sound Shore ManagementBuy10,601669,280$71,204,699
Q1 2023Dodge & Cox Stock FundSell-2,025173,206$18,427,386
Q1 2023Renaissance Technologies LLCBuy969,1572,649,259$281,855
Q1 2023Matrix Advisors Value FundSell-1504,025$428,220
Q1 2023Matrix Private Capital GroupSell-888,513$911,810
Q1 2023Mairs & Power Growth FundSell-6,22967,237$7,153,344
Q1 2023Sequoia Financial AdvisorsSell-57,332118,180$12,573,167
Q1 2023Gardner Russo & QuinnBuy1583,831$407,612
Q4 2022Kahn Brothers GroupSell-2,492681,763$75,641,652

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.