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 2023Mairs & Power Growth FundBuy4733,604$1,790,719
Q1 2023Semper Augustus Investments GroupSell-7004,269$2,121,138
Q1 2023Alapocas Investment PartnersSell-47914,255$7,082,882
Q1 2023Sequoia Financial AdvisorsBuy2,12826,096$12,966,387
Q1 2023Parnassus Endeavor FundSell-4,8381,294,266$643,081,948
Q4 2022Renaissance Technologies LLCSell-584,608138,983$63,446
Q4 2022Greenbrier Partners Capital ManagementSell-16,122226,510$103,402
Q4 2022Semper Augustus Investments GroupSell-1504,969$2,268,349
Q4 2022Alapocas Investment PartnersBuy3014,734$6,726,071
Q4 2022Sequoia Financial AdvisorsBuy6,37123,968$10,941,338
Q4 2022Parnassus Endeavor FundSell-12,7161,299,104$593,040,976
Q3 2022Torray FundBuy670670$316
Q3 2022Gardner Russo & QuinnSell-2005,389$2,545
Q3 2022Mairs & Power Growth FundSell-453,131$1,479
Q3 2022Alapocas Investment PartnersBuy11414,704$6,944
Q3 2022Sequoia Financial AdvisorsSell-5,02917,597$8,310
Q3 2022Renaissance Technologies LLCBuy452,691723,591$341,730
Q3 2022Parnassus Endeavor FundBuy19,8651,311,820$619,533
Q2 2022Gardner Russo & QuinnSell-1505,589$2,679
Q2 2022Mairs & Power Growth FundSell-23,176$1,522
Q2 2022Semper Augustus Investments GroupSell-475,119$2,453
Q2 2022Alapocas Investment PartnersBuy26014,590$6,993
Q2 2022Sequoia Financial AdvisorsBuy31422,626$10,844
Q2 2022Renaissance Technologies LLCBuy91,400270,900$129,837
Q2 2022Parnassus Endeavor FundSell-305,1301,291,955$619,208
Q1 2022Gardner Russo & QuinnBuy4755,739$3,305
Q1 2022Giverny CapitalBuy350350$202
Q1 2022Mairs & Power Growth FundBuy43,178$1,830
Q1 2022Semper Augustus Investments GroupSell-3345,166$2,975
Q1 2022Alapocas Investment PartnersSell-3,88214,330$8,252

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.