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 2022Sequoia Financial AdvisorsBuy2,68722,312$12,849
Q1 2022Renaissance Technologies LLCBuy8,100179,500$103,365
Q1 2022Parnassus Endeavor FundSell-465,0461,597,085$919,681
Q4 2021Parnassus Endeavor FundSell-9,7362,062,131$1,170,671
Q4 2021Mairs & Power Growth FundBuy5183,174$1,802
Q4 2021Semper Augustus Investments GroupSell-75,500$3,122
Q4 2021Alapocas Investment PartnersBuy18,21218,212$10,339
Q4 2021Sequoia Financial AdvisorsBuy14,44619,625$11,141
Q4 2021Renaissance Technologies LLCBuy74,800171,400$97,304
Q3 2021Parnassus Endeavor FundBuy69,8032,071,867$930,993
Q3 2021Gardner Russo & QuinnBuy965,264$2,365
Q3 2021Mairs & Power Growth FundSell-5812,656$1,193
Q3 2021Sequoia Financial AdvisorsSell-10,9675,179$2,327
Q3 2021Semper Augustus Investments GroupSell-1,2435,507$2,475
Q3 2021Renaissance Technologies LLCBuy43,10096,600$43,407
Q2 2021Parnassus Endeavor FundBuy61,7802,002,064$792,157
Q2 2021Gardner Russo & QuinnSell-1265,168$2,045
Q2 2021Mairs & Power Growth FundSell-813,237$1,281
Q2 2021Semper Augustus Investments GroupSell-106,750$2,671
Q2 2021Sequoia Financial AdvisorsBuy2,34216,146$6,388
Q2 2021Renaissance Technologies LLCBuy2,00053,500$21,168
Q1 2021Parnassus Endeavor FundBuy17,2241,940,284$683,912
Q1 2021Gardner Russo & QuinnSell-1015,294$1,866
Q1 2021Mairs & Power Growth FundSell-1143,318$1,170
Q1 2021Sequoia Financial AdvisorsBuy11,42313,804$4,866
Q1 2021Renaissance Technologies LLCSell-108,86751,500$18,153
Q4 2020Parnassus Endeavor FundSell-104,3081,923,060$724,571
Q4 2020Gardner Russo & QuinnBuy25,395$2,033
Q4 2020Sequoia Financial AdvisorsBuy1222,381$897
Q4 2020Mairs & Power Growth FundBuy803,432$1,293

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.