COSTCO WHOLESALE CORP (COST) Institutional Ownership

COST is currently held by 11 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $1.03B based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026.

The largest disclosed holder is Parnassus Endeavor Fund, which reported ownership valued at approximately $673.09M in its March 31, 2026 13F filing. Based on current market prices and the latest disclosed share count, Parnassus Endeavor Fund's COST position is now estimated to be worth approximately $646.92M, representing an estimated loss of -3.89% since the filing period.

Major shareholders tracked on this page include Parnassus Endeavor Fund, Greenbrier Partners Capital Management, Sequoia Financial Advisors, and other prominent asset managers. Collectively, these investors account for approximately 99% of the total disclosed value among the investors covered in this analysis.

This page tracks smart money ownership trends, hedge fund exposure, portfolio concentration, historical 13F filings, and estimated holding performance to help investors analyze smart money sentiment toward COSTCO WHOLESALE CORP (COST).

Institutional Ownership Trend

Portfolio quarterInstitutional holdersTotal reported valueTotal shares
Q1 202611$1,030,290,0901,033,981
Q4 202512$1,262,561,0771,687,925
Q3 202512$701,332,551757,683
Q2 202511$749,001,901756,613
Q1 202512$895,329,624946,656
Q4 202411$944,434,5651,030,738
Q3 202412$982,320,3871,096,329
Q2 202411$905,479,6741,065,282
Q1 20249$778,309,2611,098,832
Q4 20239$712,556,4221,079,477
Q3 202310$873,672,7021,546,433
Q2 202310$857,658,8221,593,036

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