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 2022Gardner Russo & QuinnBuy103,909$356
Q1 2022Kahn Brothers GroupBuy694,535694,535$56,986,655
Q1 2022Dodge & Cox Stock FundSell-14,127200,031$16,413
Q1 2022Sound Shore ManagementSell-322,9221,310,596$107,534
Q1 2022Matrix Private Capital GroupSell-46110,528$871
Q1 2022Mairs & Power Growth FundSell-3,35760,145$4,935
Q1 2022Hillman Value FundBuy80399,499$8,164
Q1 2022Matrix Advisors Value FundBuy4,419169,043$13,870
Q1 2022Sequoia Financial AdvisorsBuy26,287185,366$15,210
Q1 2022Renaissance Technologies LLCBuy4,915,3345,099,334$418,400
Q1 2022Hancock Classic ValueSell-1,7935,092$418
Q1 2022Gardner Russo & QuinnBuy113,899$320
Q4 2021Dodge & Cox Stock FundSell-7,520214,158$16,413
Q4 2021Sound Shore ManagementSell-38,2801,633,518$125,193
Q4 2021Parnassus Endeavor FundBuy349,6152,306,548$176,774
Q4 2021Matrix Private Capital GroupBuy25210,989$850
Q4 2021Mairs & Power Growth FundSell-52663,502$4,867
Q4 2021Hillman Value FundSell-1,04198,696$7,564
Q4 2021Sequoia Financial AdvisorsBuy123,673159,079$12,192
Q4 2021Matrix Advisors Value FundSell-10,376164,624$12,617
Q4 2021Renaissance Technologies LLCSell-1,315,000184,000$14,102
Q4 2021Hancock Classic ValueSell-7346,885$528
Q4 2021Gardner Russo & QuinnBuy103,888$298
Q3 2021Dodge & Cox Stock FundSell-7,350221,678$16,650
Q3 2021Sound Shore ManagementBuy424,9391,671,798$125,569
Q3 2021Parnassus Endeavor FundBuy249,6311,956,933$146,985
Q3 2021Matrix Private Capital GroupBuy12510,737$813
Q3 2021Sequoia Financial AdvisorsSell-41,57735,406$2,659
Q3 2021Mairs & Power Growth FundSell-2,92564,028$4,809
Q3 2021Hillman Value FundBuy4,18099,737$7,491

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.