Costco Wholesale Corp
Ownership
Ownership Structure
Who owns Costco Wholesale Corp (COST)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.4% of the shares are freely tradable; institutional investors hold 73.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.88 | 34,947,040 | -0.4 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.50 | 28,847,448 | +0.0 | 03/31/2026 |
| State Street Corp | 4.09 | 18,152,232 | +0.0 | 03/31/2026 |
| Amvescap Plc. | 3.07 | 13,629,248 | -4.6 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 2.41 | 10,705,635 | +0.0 | 03/31/2026 |
| Geode Capital Management, LLC | 2.40 | 10,659,224 | +2.6 | 03/31/2026 |
| Morgan Stanley - Brokerage Accounts | 2.23 | 9,898,711 | +3.9 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.19 | 14,126,150 | +0.3 | 07/31/2026 |
| Vanguard 500 Index Investor | 2.63 | 11,644,783 | +1.1 | 07/31/2026 |
| Invesco QQQ Trust | 2.15 | 9,543,905 | +0.5 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Klauer James C | Executive Vice President | 48,030 | 42,933,909 $ | Sep 10, 2026 | direct |
| Riel Pierre | Executive Vice President | 14,246 | 12,734,701 $ | Sep 10, 2026 | direct |
| Rubanenko Yoram | Executive Vice President | 10,680 | 9,547,001 $ | Sep 10, 2026 | direct |
| Adamo Claudine | Executive Vice President | 9,334 | 8,343,225 $ | Sep 10, 2026 | direct |
| Frates Caton | Executive Vice President | 8,713 | 7,788,227 $ | Sep 10, 2026 | direct |
| Jones Teresa A. | Executive Vice President | 6,598 | 5,898,193 $ | Sep 10, 2026 | direct |
| Raikes Jeffrey S | Director | 6,044 | 5,402,674 $ | Jul 10, 2026 | direct |
| Wilcox William Richard | Executive Vice President | 4,194 | 3,749,366 $ | Sep 10, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 10, 2026 | Wilcox William Richard | Executive Vice President | Other | 1,935 | 902.38 | 1,746,105 |
| Sep 10, 2026 | Wilcox William Richard | Executive Vice President | Other | 4,129 | 0.00 | – |
| Sep 10, 2026 | Rubanenko Yoram | Executive Vice President | Other | 1,696 | 902.38 | 1,530,436 |
| Sep 10, 2026 | Rubanenko Yoram | Executive Vice President | Other | 4,129 | 0.00 | – |
| Sep 10, 2026 | Riel Pierre | Executive Vice President | Other | 1,562 | 902.38 | 1,409,518 |
| Sep 10, 2026 | Riel Pierre | Executive Vice President | Other | 4,552 | 0.00 | – |
| Sep 10, 2026 | Klauer James C | Executive Vice President | Other | 936 | 902.38 | 844,628 |
| Sep 10, 2026 | Klauer James C | Executive Vice President | Other | 4,129 | 0.00 | – |
| Sep 10, 2026 | Jones Teresa A. | Executive Vice President | Other | 1,459 | 902.38 | 1,316,572 |
| Sep 10, 2026 | Jones Teresa A. | Executive Vice President | Other | 4,129 | 0.00 | – |
| Sep 10, 2026 | Frates Caton | Executive Vice President | Other | 1,654 | 902.38 | 1,492,537 |
| Sep 10, 2026 | Frates Caton | Executive Vice President | Other | 4,552 | 0.00 | – |
| Sep 10, 2026 | Adamo Claudine | Executive Vice President | Other | 917 | 902.38 | 827,482 |
| Sep 10, 2026 | Adamo Claudine | Executive Vice President | Other | 4,129 | 0.00 | – |
| Jul 10, 2026 | Raikes Jeffrey S | Director | Other | 5,249 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.