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 2020Hillman Value FundSell-5138,467$3,191
Q3 2020Torray FundBuy4515,199$1,261
Q3 2020Gardner Russo & QuinnBuy93,935$326
Q2 2020Renaissance Technologies LLCSell-3,151,9413,740,429$289,247
Q2 2020Causeway Capital ManagementSell-640,968814,074$62,952
Q2 2020Sound Shore ManagementSell-184,2861,490,011$115,223
Q2 2020Dodge & Cox Stock FundSell-170,979345,979$26,755
Q2 2020Sequoia Financial AdvisorsSell-32,8560$2,868
Q2 2020Matrix Advisors Value FundBuy12,126130,135$10,063
Q2 2020Torray FundSell-1,57015,154$1,172
Q2 2020Gardner Russo & QuinnBuy1,1753,926$304
Q2 2020Mairs & Power Growth FundSell-82480,830$6,251
Q2 2020Matrix Private Capital GroupBuy2228,214$640
Q2 2020Lountzis Asset ManagementBuy5757$4
Q2 2020Hillman Value FundSell-438,518$2,979
Q1 2020Renaissance Technologies LLCBuy1,219,1276,892,370$530,299
Q1 2020Causeway Capital ManagementSell-315,0681,455,042$111,951
Q1 2020Dodge & Cox Stock FundSell-172,438516,958$39,775
Q1 2020Sound Shore ManagementBuy107,1941,674,297$128,820
Q1 2020Hancock Classic ValueSell-33,21325,598$1,970
Q1 2020Matrix Advisors Value FundBuy16,739118,009$9,080
Q1 2020Torray FundSell-4,58516,724$1,287
Q1 2020Sequoia Financial AdvisorsBuy4,17432,856$2,528
Q1 2020Hillman Value FundBuy3,06338,522$2,964
Q1 2020Semper Augustus Investments GroupBuy1,53244,044$3,389
Q1 2020Matrix Private Capital GroupSell-1,0007,992$620
Q1 2020Mairs & Power Growth FundSell-87481,654$6,282
Q4 2019Renaissance Technologies LLCBuy1,625,8305,673,243$515,981
Q4 2019Hancock Classic ValueSell-710,61158,811$5,349
Q4 2019Sound Shore ManagementSell-111,8571,567,103$142,528

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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