Costco Wholesale Corporation
COSTLast close · Oct 16, 2026989.11+11.10 (+1.13%)
Market cap$438.3B
Of the 85 managers this site tracks, 8 held Costco (COST) at the end of Q3 2026, their latest 13Fs. The largest position by value was Thomas Gayner's, $36.6M; Bridgewater's ($24.8M) and Thomas Russo's ($3.2M) follow. No Schedule 13D or 13G is on file for COST from the activists and large holders the site follows.
Superinvestors holding COST
| Manager | Firm | Quarter | Shares | Value |
|---|---|---|---|---|
| Thomas Gayner | Markel Group Inc. | Q2 2026 | 39,150 | $36.6M |
| Bridgewater | Bridgewater Associates, LP | Q2 2026 | 26,503 | $24.8M |
| Thomas Russo | Gardner Russo & Quinn LLC | Q2 2026 | 3,399 | $3.2M |
| Christopher Bloomstran | Semper Augustus Investments Group LLC | Q2 2026 | 3,354 | $3.1M |
| Mairs & Power | Mairs & Power Inc | Q2 2026 | 2,963 | $2.8M |
| Torray | Torray Investment Partners LLC | Q2 2026 | 628 | $587,475 |
| David Katz | Matrix Asset Advisors Inc | Q3 2026 | 551 | $501,409 |
| Bill Nygren | Harris Associates L P | Q2 2026 | 358 | $334,898 |
13D/13G are SEC beneficial-ownership disclosures, triggered only above 5%; a 13F is a quarterly snapshot filed up to 45 days after quarter end. Superinvestor names link to their full portfolios under Investors.