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
Q1 2025Sequoia Financial AdvisorsSell-80,987280,446$25,172,820
Q1 2025Causeway Capital ManagementBuy313,396897,869$80,592,684
Q1 2025Cullen Value FundBuy12,128110,189$9,890,599
Q1 2025Gardner Russo & QuinnSell-1632,763$248,013
Q4 2024Kahn Brothers GroupSell-71,580508,908$50,626,737
Q4 2024Dodge & Cox Stock FundSell-900157,351$15,653,277
Q4 2024Hancock Classic ValueSell-3,5272,898$288,293
Q4 2024Mairs & Power Growth FundBuy51353,900$5,361,972
Q4 2024Sequoia Financial AdvisorsBuy32,726361,433$35,955,403
Q4 2024Causeway Capital ManagementSell-229,601584,473$58,143,366
Q4 2024Renaissance Technologies LLCBuy295,7581,381,636$137,444,775
Q4 2024Cullen Value FundBuy2,08498,061$9,755,135
Q4 2024Gardner Russo & QuinnSell-1612,926$291,104
Q3 2024Kahn Brothers GroupSell-11,423580,488$65,920,748
Q3 2024Sound Shore ManagementBuy16,528547,423$62,165,356
Q3 2024Dodge & Cox Stock FundSell-625158,251$17,970,984
Q3 2024Mairs & Power Growth FundSell-1,46453,387$6,062,628
Q3 2024Sequoia Financial AdvisorsBuy150,432328,707$37,337,217
Q3 2024Renaissance Technologies LLCBuy1,080,9631,085,878$123,312,541
Q3 2024Cullen Value FundBuy3,03695,977$10,899,175
Q3 2024Gardner Russo & QuinnSell-3593,087$350,548
Q2 2024Torray FundSell-31,3561,705$211,079
Q2 2024Kahn Brothers GroupSell-21,904591,911$73,278,768
Q2 2024Sound Shore ManagementSell-162,397530,895$65,724,801
Q2 2024Dodge & Cox Stock FundSell-1,619158,876$19,668,849
Q2 2024Meritage GroupBuy1592,292$283,750
Q2 2024Renaissance Technologies LLCSell-195,2874,915$609,688
Q2 2024Matrix Private Capital GroupBuy728,371$1,042,775
Q2 2024Mairs & Power Growth FundSell-2,16654,851$6,790,554
Q2 2024Sequoia Financial AdvisorsBuy19,179178,275$22,078,435

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.