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 2019Sequoia Financial AdvisorsSell-41327,308$2,299
Q3 2019Semper Augustus Investments GroupSell-21142,512$3,579
Q3 2019Matrix Advisors Value FundBuy1,408100,054$8,423
Q3 2019Hancock Classic ValueSell-493,812769,422$64,770
Q3 2019Causeway Capital ManagementBuy69,5301,829,585$154,014
Q3 2019Renaissance Technologies LLCBuy2,730,0134,047,413$340,711
Q2 2019Torray FundBuy61221,359$1,791
Q2 2019Mairs & Power Growth FundSell-4,53878,405$6,574
Q2 2019Dodge & Cox Stock FundSell-54,068714,622$59,921
Q2 2019Sound Shore ManagementSell-637,8671,712,426$143,587
Q2 2019Sequoia Financial AdvisorsBuy13627,721$2,324
Q2 2019Matrix Advisors Value FundBuy16,61498,646$8,271
Q2 2019Hancock Classic ValueSell-647,8221,263,234$105,922
Q2 2019Renaissance Technologies LLCBuy1,300,5001,317,400$110,464
Q2 2019Causeway Capital ManagementBuy17,0861,760,055$147,581
Q2 2019Gardner Russo & QuinnSell-52,781$233
Q1 2019Torray FundSell-2,00820,747$1,726
Q1 2019Mairs & Power Growth FundSell-5,20582,943$6,898
Q1 2019Dodge & Cox Stock FundSell-61,335768,690$63,932
Q1 2019Sound Shore ManagementSell-973,8982,350,293$195,474
Q1 2019Sequoia Financial AdvisorsBuy8,75527,585$2,294
Q1 2019Matrix Advisors Value FundSell-30,72082,032$6,823
Q1 2019Causeway Capital ManagementBuy1,742,9691,742,969$144,963
Q1 2019Hancock Classic ValueSell-1,769,9111,911,056$158,943
Q4 2018Torray FundSell-3,21022,755$1,739
Q4 2018Mairs & Power Growth FundSell-1,08588,148$6,735
Q4 2018Dodge & Cox Stock FundSell-162,238830,025$63,422
Q4 2018Sound Shore ManagementSell-348,7123,324,191$254,001
Q4 2018Sequoia Financial AdvisorsSell-20918,830$1,439
Q4 2018Matrix Advisors Value FundSell-29,197112,752$8,615

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.