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
Q4 2025Kahn Brothers GroupSell-3,647430,103$45,272,674
Q4 2025Matrix Advisors Value FundSell-82,862$301,254
Q4 2025Matrix Private Capital GroupBuy6018,445$895,955
Q4 2025Mairs & Power Growth FundSell-18851,999$5,473,415
Q4 2025Causeway Capital ManagementSell-89,4401,044,617$109,956,449
Q4 2025Cullen Value FundSell-11,693117,623$13,001,569
Q3 2025Dodge & Cox Stock FundSell-3,025154,275$12,948,301
Q3 2025Matrix Advisors Value FundSell-452,870$240,879
Q3 2025Matrix Private Capital GroupBuy4047,844$664,616
Q3 2025Mairs & Power Growth FundSell-4,68452,187$4,380,055
Q3 2025Sequoia Financial AdvisorsBuy12,467311,565$26,149,660
Q3 2025Causeway Capital ManagementBuy151,3971,134,057$95,181,306
Q3 2025Kahn Brothers GroupSell-56,715433,750$36,404,663
Q3 2025Cullen Value FundBuy8,890129,316$11,534,234
Q2 2025Dodge & Cox Stock FundBuy231157,300$12,451,868
Q2 2025Matrix Advisors Value FundSell-312,915$230,751
Q2 2025Hancock Classic ValueBuy4263,324$263,128
Q2 2025Matrix Private Capital GroupSell-5917,440$594,977
Q2 2025Mairs & Power Growth FundBuy3,71256,871$4,501,908
Q2 2025Renaissance Technologies LLCSell-81,872139,820$11,068,154
Q2 2025Sequoia Financial AdvisorsBuy18,652299,098$23,676,589
Q2 2025Causeway Capital ManagementBuy84,791982,660$77,787,310
Q2 2025Kahn Brothers GroupSell-1,810490,465$38,825,234
Q2 2025Cullen Value FundBuy10,237120,426$9,532,899
Q1 2025Kahn Brothers GroupSell-16,633492,275$44,187,086
Q1 2025Dodge & Cox Stock FundSell-282157,069$14,098,513
Q1 2025Matrix Advisors Value FundBuy842,946$264,433
Q1 2025Matrix Private Capital GroupSell-3408,031$727,368
Q1 2025Mairs & Power Growth FundSell-74153,159$4,771,552
Q1 2025Renaissance Technologies LLCSell-1,159,944221,692$19,899,292

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.