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
Q3 2019Gardner Russo & QuinnBuy785,170$1,490
Q3 2019Sequoia Financial AdvisorsSell-2262,379$685
Q3 2019Sequoia FundSell-642,415$696
Q3 2019Semper Augustus Investments GroupBuy8919,619$5,652
Q3 2019Greenbrier Partners Capital ManagementSell-1,468248,532$71,605
Q3 2019Renaissance Technologies LLCSell-691,259462,913$133,370
Q2 2019Mairs & Power Growth FundSell-313,422$904
Q2 2019Sequoia FundSell-4322,479$655
Q2 2019Ariel Appreciation FundSell-42,34192,635$24,480
Q2 2019Parnassus Endeavor FundBuy2,214,7812,239,781$591,885
Q2 2019Gardner Russo & QuinnSell-1355,092$1,346
Q2 2019Sequoia Financial AdvisorsBuy4182,605$688
Q2 2019Semper Augustus Investments GroupBuy1419,530$5,161
Q1 2019Mairs & Power Growth FundSell-693,453$836
Q1 2019Ariel Appreciation FundSell-2,584134,976$32,683
Q1 2019Sequoia Financial AdvisorsBuy5952,187$530
Q1 2019Sequoia FundSell-1142,911$705
Q1 2019Renaissance Technologies LLCBuy431,9871,154,172$279,471
Q4 2018Ariel Appreciation FundSell-452137,560$28,022
Q4 2018Sequoia Financial AdvisorsSell-411,592$324
Q4 2018Sequoia FundSell-17,2283,025$616
Q4 2018Semper Augustus Investments GroupSell-30019,516$3,976
Q4 2018Renaissance Technologies LLCBuy543,172722,185$147,116
Q3 2018Mairs & Power Growth FundSell-1503,522$827
Q3 2018Parnassus Endeavor FundSell-265,00025,000$5,872
Q3 2018Ariel Appreciation FundSell-91,970138,012$32,416
Q3 2018Gardner Russo & QuinnSell-2465,227$1,228
Q3 2018Sequoia Financial AdvisorsBuy161,633$384
Q3 2018Sequoia FundSell-45620,253$4,757
Q3 2018Renaissance Technologies LLCSell-799,887179,013$42,047

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.