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
Q1 2024Greenbrier Partners Capital ManagementSell-1,202224,647$164,583,132
Q1 2024Parnassus Endeavor FundSell-7,280769,447$563,719,956
Q4 2023Gardner Russo & QuinnBuy4075,550$3,663,426
Q4 2023Matrix Advisors Value FundSell-10547$361,064
Q4 2023Semper Augustus Investments GroupBuy3574,341$2,865,407
Q4 2023Mairs & Power Growth FundBuy1,4864,936$3,258,155
Q4 2023Alapocas Investment PartnersBuy2814,740$9,729,579
Q4 2023Sequoia Financial AdvisorsBuy35,52945,925$30,329,436
Q4 2023Greenbrier Partners Capital ManagementSell-661225,849$149,078,408
Q4 2023Parnassus Endeavor FundSell-503,714776,727$512,701,958
Q3 2023Torray FundBuy200862$486,996
Q3 2023Gardner Russo & QuinnSell-855,143$2,905,491
Q3 2023Matrix Private Capital GroupBuy2378$213,825
Q3 2023Matrix Advisors Value FundBuy1557$314,683
Q3 2023Mairs & Power Growth FundSell-1753,450$1,949,112
Q3 2023Semper Augustus Investments GroupSell-1883,984$2,250,801
Q3 2023Sequoia Financial AdvisorsSell-21,44910,396$5,873,065
Q3 2023Alapocas Investment PartnersBuy28314,712$8,311,692
Q3 2023Parnassus Endeavor FundSell-25,1921,280,441$723,397,947
Q2 2023Gardner Russo & QuinnBuy965,228$2,814,471
Q2 2023Matrix Private Capital GroupBuy376376$202,604
Q2 2023Mairs & Power Growth FundBuy213,625$1,951,628
Q2 2023Semper Augustus Investments GroupSell-974,172$2,246,121
Q2 2023Alapocas Investment PartnersBuy17414,429$7,768,285
Q2 2023Sequoia Financial AdvisorsBuy5,74931,845$17,144,818
Q2 2023Parnassus Endeavor FundBuy11,3671,305,633$702,926,694
Q1 2023Torray FundSell-8662$328,928
Q1 2023Gardner Russo & QuinnSell-2575,132$2,550,182
Q1 2023Renaissance Technologies LLCBuy93,809232,792$115,668
Q1 2023Matrix Advisors Value FundBuy556556$276,260

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.