Costco Wholesale Corporation (COST) ownership: Top institutional holder: VANGUARD GROUP INC ($37.62B). Insider activity: Net Seller (1 buys, 3 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 43620717.00 | $37.62B | 2025-12-31 |
| BlackRock, Inc. | 34947040.00 | $34.82B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 28847448.00 | $28.74B | 2026-03-31 |
| STATE STREET CORP | 18152232.00 | $18.09B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 10705635.00 | $10.67B | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 10659224.00 | $10.58B | 2026-03-31 |
| MORGAN STANLEY | 9898711.00 | $9.86B | 2026-03-31 |
| BANK OF AMERICA CORP /DE/ | 7515031.00 | $7.49B | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-04-01 | |
| Sell | null | 2026-03-12 | |
| Buy | null | 2026-03-11 | |
| Sell | null | 2026-03-09 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.