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
Q1 2026Renaissance Technologies LLCSell-673,54619,456$19,386,949
Q1 2026Parnassus Endeavor FundBuy13,057675,504$673,092,451
Q1 2026Sequoia Financial AdvisorsBuy8,53197,275$96,928,035
Q1 2026Greenbrier Partners Capital ManagementSell-1,587222,472$221,677,775
Q1 2026Alapocas Investment PartnersSell-1056,870$6,845,474
Q1 2026Semper Augustus Investments GroupSell-803,367$3,354,980
Q1 2026Mairs & Power Growth FundBuy302,963$2,952,422
Q1 2026Matrix Advisors Value FundSell-4559$556,568
Q4 2025Renaissance Technologies LLCBuy679,978693,002$597,603,722
Q4 2025Parnassus Endeavor FundBuy242,009662,447$571,254,546
Q4 2025Sequoia Financial AdvisorsBuy8,99088,744$76,527,911
Q4 2025Greenbrier Partners Capital ManagementSell-293224,059$193,215
Q4 2025Mairs & Power Growth FundSell-2882,933$2,529,243
Q4 2025Alapocas Investment PartnersSell-1656,975$6,014,822
Q4 2025Semper Augustus Investments GroupBuy123,447$2,972,486
Q4 2025Matrix Advisors Value FundSell-1563$485,896
Q3 2025Renaissance Technologies LLCSell-108,17513,024$12,056,579
Q3 2025Parnassus Endeavor FundSell-13,713420,438$389,170,026
Q3 2025Sequoia Financial AdvisorsBuy4,19379,754$73,822,750
Q3 2025Alapocas Investment PartnersSell-2,1087,140$6,608,998
Q3 2025Semper Augustus Investments GroupSell-3333,435$3,179,539
Q3 2025Mairs & Power Growth FundBuy333,221$2,981,454
Q3 2025Gardner Russo & QuinnSell-94,624$4,279,820
Q3 2025Matrix Advisors Value FundSell-9564$522,382
Q3 2025Torray FundSell-8628$581,296
Q2 2025Parnassus Endeavor FundSell-73,212434,151$429,783,441
Q2 2025Sequoia Financial AdvisorsBuy5,49375,561$74,800,870
Q2 2025Alapocas Investment PartnersSell-1,1259,248$9,155,361
Q2 2025Mairs & Power Growth FundBuy4883,188$3,155,929
Q2 2025Semper Augustus Investments GroupSell-4773,768$3,730,094

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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