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
Q2 2024Cullen Value FundBuy75192,941$11,506,129
Q2 2024Gardner Russo & QuinnSell-673,446$426,592
Q1 2024Torray FundBuy31,02033,061$224,975
Q1 2024Kahn Brothers GroupSell-10,726613,815$80,992,904
Q1 2024Sound Shore ManagementSell-8,431693,292$91,479,880
Q1 2024Dodge & Cox Stock FundSell-450160,495$21,177,315
Q1 2024Eagle Capital ManagementBuy1,5911,591$210
Q1 2024Meritage GroupSell-7402,133$281
Q1 2024Renaissance Technologies LLCBuy80,378200,202$26,417
Q1 2024Matrix Advisors Value FundSell-4252,862$377,641
Q1 2024Matrix Private Capital GroupSell-1648,299$1,101,443
Q1 2024Semper Augustus Investments GroupSell-13244,443$5,864,254
Q1 2024Mairs & Power Growth FundSell-4,96757,017$7,523,393
Q1 2024Sequoia Financial AdvisorsSell-10,864159,096$21,000,389
Q1 2024Cullen Value FundBuy2,64592,190$12,017,030
Q1 2024Gardner Russo & QuinnSell-2933,513$463,550
Q4 2023Kahn Brothers GroupSell-14,252624,541$68,087,714
Q4 2023Sound Shore ManagementSell-1,570701,723$76,501,841
Q4 2023Dodge & Cox Stock FundSell-2,850160,945$17,546,224
Q4 2023Meritage GroupBuy2,8732,873$313
Q4 2023Renaissance Technologies LLCSell-247,819119,824$13,063
Q4 2023Matrix Advisors Value FundBuy313,287$358,349
Q4 2023Matrix Private Capital GroupSell-408,463$929,153
Q4 2023Semper Augustus Investments GroupBuy13144,575$4,859,567
Q4 2023Mairs & Power Growth FundBuy2,63961,984$6,757,496
Q4 2023Sequoia Financial AdvisorsBuy111,706169,960$18,536,760
Q4 2023Cullen Value FundBuy89,54589,545$9,762,221
Q4 2023Gardner Russo & QuinnSell-363,806$414,974
Q3 2023Torray FundSell-12,1572,041$210,121
Q3 2023Kahn Brothers GroupSell-9,878638,793$65,763,770

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.