Costco Wholesale Corporation (COST) Shareholders & Insider Trades
Costco Wholesale shareholders at a glance
The largest holder of Costco Wholesale stock is Vanguard Capital Management LLC, with 29.0 million shares (6.53% of the company), worth about $27.35 billion as of September 25, 2026. The 10 largest holders together own 31.5%.
In Q2 2026, 4,405 institutional holdings reports listed shares worth $312.00 billion.
Insiders reported 75 transactions in the last two years: 25 sales worth $40.96 million and no purchases. The newest one on file is from September 10, 2026 (Wilcox William Richard, Officer).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through September 10, 2026.
Costco Wholesale Corporation
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Costco Wholesale shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| Vanguard Capital Management LLC | 29.0 million | 6.53% | $27.4B |
| BlackRock Advisors LLC | 25.8 million | 5.83% | $24.4B |
| State Street Corporation | 18.4 million | 4.15% | $17.4B |
| Invesco Advisers, Inc. | 14.0 million | 3.15% | $13.2B |
| Geode Capital Management LLC | 10.6 million | 2.40% | $10.0B |
| Vanguard Portfolio Management LLC | 10.4 million | 2.35% | $9.8B |
| Eaton Vance Management | 10.2 million | 2.31% | $9.6B |
| BlackRock Life Ltd. | 7.7 million | 1.73% | $7.2B |
| Merrill Lynch International | 7.2 million | 1.64% | $6.8B |
| Norges Bank (13F) | 6.5 million | 1.46% | $6.1B |
As of September 25, 2026.
Costco Wholesale institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 4,405 | – | $312.0B |
| Q1 2026 | 4,419 | 321.0 million | $312.0B |
| Q4 2025 | 4,280 | 325.0 million | $274.0B |
| Q3 2025 | 4,116 | 300.0 million | $278.0B |
| Q2 2025 | 4,173 | 310.0 million | $307.0B |
| Q1 2025 | 4,108 | 306.0 million | $289.0B |
| Q4 2024 | 4,099 | 306.0 million | $281.0B |
| Q3 2024 | 3,750 | 314.0 million | $273.0B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Costco Wholesale insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Wilcox William Richard | Sep 10, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Adamo Claudine | Sep 10, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Riel Pierre | Sep 10, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Frates Caton | Sep 10, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Jones Teresa A | Sep 10, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Klauer James C | Sep 10, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Rubanenko Yoram B. | Sep 10, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Raikes Jeffrey S | Jul 10, 2026 | Director | Stock Gift at price 0.00 per share. | – |
| Denman Kenneth D | Jun 23, 2026 | Director | Sale at price 957.45 per share. | $847,345 |
| Frates Caton | Apr 1, 2026 | Officer | Sale at price 993.00 per share. | $695,100 |
| Adamo Claudine | Mar 9, 2026 | Officer | Sale at price 1003.02 per share. | $732,205 |
| Jones Teresa A | Jan 27, 2026 | Officer | Stock Gift at price 0.00 per share. | – |
Newest 12 of 75 insider transactions in the last two years.
Questions and answers
Who owns the most Costco Wholesale stock?
Vanguard Capital Management LLC, with 6.53% of the company (as of September 25, 2026). Next: BlackRock Advisors LLC (5.83%) and State Street Corporation (4.15%).
How many institutions own Costco Wholesale stock?
4,405 institutional holdings reports listed Costco Wholesale shares in Q2 2026 worth $312.00 billion.
Are Costco Wholesale insiders buying or selling the stock?
In the last two years insiders reported 25 sales and no purchases (75 transactions in all); the newest on file is from September 10, 2026.
