COSTCO WHOLESALE CORP (COST) Institutional Ownership Changes & 13F Activity

COSTCO WHOLESALE CORP (COST) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC, Parnassus Endeavor Fund, Sequoia Financial Advisors, Greenbrier Partners Capital Management, and Alapocas Investment Partners.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2024Sequoia Financial AdvisorsBuy5,46445,239$38,453,036
Q2 2024Mairs & Power Growth FundSell-8453,734$3,173,863
Q2 2024Alapocas Investment PartnersSell-54412,317$10,469,327
Q2 2024Cullen Value FundBuy257257$218,618
Q2 2024Semper Augustus Investments GroupSell-254,330$3,680,457
Q2 2024Matrix Advisors Value FundSell-3544$462,000
Q1 2024Torray FundBuy36,28237,144$485,001
Q1 2024Parnassus Endeavor FundSell-7,280769,447$563,719,956
Q1 2024Sequoia Financial AdvisorsSell-6,15039,775$29,140,142
Q1 2024Alapocas Investment PartnersSell-1,87912,861$9,422,354
Q1 2024Greenbrier Partners Capital ManagementSell-1,202224,647$164,583,132
Q1 2024Mairs & Power Growth FundSell-3574,579$3,354,713
Q1 2024Gardner Russo & QuinnSell-735,477$4,012,610
Q1 2024Semper Augustus Investments GroupBuy144,355$3,190,604
Q4 2023Parnassus Endeavor FundSell-503,714776,727$512,701,958
Q4 2023Sequoia Financial AdvisorsBuy35,52945,925$30,329,436
Q4 2023Mairs & Power Growth FundBuy1,4864,936$3,258,155
Q4 2023Greenbrier Partners Capital ManagementSell-661225,849$149,078,408
Q4 2023Gardner Russo & QuinnBuy4075,550$3,663,426
Q4 2023Semper Augustus Investments GroupBuy3574,341$2,865,407
Q4 2023Alapocas Investment PartnersBuy2814,740$9,729,579
Q4 2023Matrix Advisors Value FundSell-10547$361,064
Q3 2023Parnassus Endeavor FundSell-25,1921,280,441$723,397,947
Q3 2023Sequoia Financial AdvisorsSell-21,44910,396$5,873,065
Q3 2023Alapocas Investment PartnersBuy28314,712$8,311,692
Q3 2023Torray FundBuy200862$486,996
Q3 2023Semper Augustus Investments GroupSell-1883,984$2,250,801
Q3 2023Mairs & Power Growth FundSell-1753,450$1,949,112
Q3 2023Gardner Russo & QuinnSell-855,143$2,905,491
Q3 2023Matrix Private Capital GroupBuy2378$213,825

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.

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