COSTCO WHOLESALE CORP (COST) Stock Institutional Trading Activity


COSTCO WHOLESALE CORP (COST) 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 Renaissance Technologies LLC, Mairs & Power Growth Fund, Semper Augustus Investments Group, Matrix Advisors Value Fund, and Parnassus Endeavor 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 2024Matrix Advisors Value FundBuy350894$819,145
Q4 2024Mairs & Power Growth FundSell-3582,739$2,509,664
Q4 2024Semper Augustus Investments GroupBuy204,350$3,985,775
Q4 2024Alapocas Investment PartnersSell-13212,053$11,043,802
Q4 2024Sequoia Financial AdvisorsBuy16,96768,976$63,200,387
Q4 2024Parnassus Endeavor FundSell-51,368710,831$651,313,120
Q3 2024Torray FundSell-15643$570,032
Q3 2024Gardner Russo & QuinnSell-555,422$4,806,931
Q3 2024Giverny CapitalSell-110240$212,765
Q3 2024Mairs & Power Growth FundSell-6373,097$2,745,552
Q3 2024Alapocas Investment PartnersSell-13212,185$10,802,246
Q3 2024Renaissance Technologies LLCBuy26,10831,051$27,528,374
Q3 2024Sequoia Financial AdvisorsBuy6,77052,009$46,107,423
Q3 2024Greenbrier Partners Capital ManagementSell-295224,352$209,293,494
Q3 2024Parnassus Endeavor FundSell-937762,199$675,704,658
Q2 2024Torray FundSell-36,486658$559,293
Q2 2024Cullen Value FundBuy257257$218,618
Q2 2024Matrix Advisors Value FundSell-3544$462,000
Q2 2024Mairs & Power Growth FundSell-8453,734$3,173,863
Q2 2024Semper Augustus Investments GroupSell-254,330$3,680,457
Q2 2024Renaissance Technologies LLCSell-227,8494,943$4,201,906
Q2 2024Alapocas Investment PartnersSell-54412,317$10,469,327
Q2 2024Sequoia Financial AdvisorsBuy5,46445,239$38,453,036
Q2 2024Parnassus Endeavor FundSell-6,311763,136$648,657,969
Q1 2024Torray FundBuy36,28237,144$485,001
Q1 2024Gardner Russo & QuinnSell-735,477$4,012,610
Q1 2024Semper Augustus Investments GroupBuy144,355$3,190,604
Q1 2024Mairs & Power Growth FundSell-3574,579$3,354,713
Q1 2024Alapocas Investment PartnersSell-1,87912,861$9,422,354
Q1 2024Sequoia Financial AdvisorsSell-6,15039,775$29,140,142

Frequently asked questions about COST activity

  • Which institutional owners are buying COST?

    Institutional owners buying COST 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 COST activity?

    "Buy" means an investor increased their reported position in COST compared to the prior reporting period. This reflects growing exposure to COSTCO WHOLESALE CORP (COST) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in COST increasing?

    Institutional interest in COST 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.