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
Q3 2022Hancock Classic ValueSell-7106,425$553
Q3 2022Gardner Russo & QuinnSell-513,858$332
Q2 2022Renaissance Technologies LLCBuy1,664,6006,763,934$616,668
Q2 2022Sound Shore ManagementSell-648,082662,514$60,401
Q2 2022Matrix Advisors Value FundSell-164,1784,865$444
Q2 2022Sequoia Financial AdvisorsSell-56,835128,531$11,719
Q2 2022Dodge & Cox Stock FundSell-7,200192,831$17,580
Q2 2022Kahn Brothers GroupBuy4,489699,024$63,730,136
Q2 2022Mairs & Power Growth FundSell-3,30256,843$5,182
Q2 2022Hancock Classic ValueBuy2,0437,135$650
Q2 2022Hillman Value FundSell-1,38598,114$8,945
Q2 2022Semper Augustus Investments GroupBuy40044,473$4,055
Q2 2022Matrix Private Capital GroupBuy37910,907$1,001
Q2 2022Gardner Russo & QuinnBuy103,909$356
Q1 2022Renaissance Technologies LLCBuy4,915,3345,099,334$418,400
Q1 2022Kahn Brothers GroupBuy694,535694,535$56,986,655
Q1 2022Sound Shore ManagementSell-322,9221,310,596$107,534
Q1 2022Sequoia Financial AdvisorsBuy26,287185,366$15,210
Q1 2022Dodge & Cox Stock FundSell-14,127200,031$16,413
Q1 2022Matrix Advisors Value FundBuy4,419169,043$13,870
Q1 2022Mairs & Power Growth FundSell-3,35760,145$4,935
Q1 2022Hancock Classic ValueSell-1,7935,092$418
Q1 2022Hillman Value FundBuy80399,499$8,164
Q1 2022Matrix Private Capital GroupSell-46110,528$871
Q1 2022Gardner Russo & QuinnBuy113,899$320
Q4 2021Renaissance Technologies LLCSell-1,315,000184,000$14,102
Q4 2021Parnassus Endeavor FundBuy349,6152,306,548$176,774
Q4 2021Sequoia Financial AdvisorsBuy123,673159,079$12,192
Q4 2021Sound Shore ManagementSell-38,2801,633,518$125,193
Q4 2021Matrix Advisors Value FundSell-10,376164,624$12,617

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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