Costco Wholesale Corp
COST- Exchange
- Nasdaq
- Industry
- Retail-Variety Stores
- SEC CIK
- 0000909832
No open-market purchases or sales by Costco Wholesale Corp insiders were filed in the last 90 days; 4,260 institutions reported holding it in 13F filings for Q2 2026, worth $309.6B in total; 4 superinvestors hold it, including Markel Group and Gardner Russo & Quinn.
Key figures
- Insider buysOpen market, last 90 days
- 0
- Insider sellsOpen market, last 90 days
- 0
- 13F holdersQ2 2026, +45 vs. previous quarter
- 4,260
- 13F valueReported value at the end of Q2 2026
- $309.6B
- Superinvestors holdingAt the end of Q2 2026
- 4
Price chart
Superinvestors holding COST, Q2 2026
4 superinvestors report holding Costco Wholesale Corp on Form 13F. Percentages are the stock's share of each portfolio.
Gardner Russo & Quinn
Tom Russo
<0.1%
Costco Wholesale Corp's share of the portfolio
- Shares
- 3,399
- Value
- $3.18M
| Superinvestor | Weight | Value |
|---|---|---|
| Semper Augustus | 0.4% | $3.14M |
| Harris Associates (Oakmark) | <0.1% | $334.9K |
Latest insider trades
Open-market purchases and sales by Costco Wholesale Corp insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jun 25, 2026 (view filing) | Jun 23 | 2 days | Denman Kenneth DDirector | SSale | −885 | $957.45 | −$847.3K | −15.6%4.78K after | |
| Apr 1, 2026 (view filing) | Apr 1 | Same day | Frates CatonExecutive Vice President | SSale | −700 | $993.00 | −$695.1K | −10.7%5.82K after | |
| Mar 11, 2026 (view filing) | Mar 9 | 2 days | Adamo ClaudineExecutive Vice President | SSale | −730 | $1,003.02 | −$732.2K | −10.7%6.12K after | |
| Jan 23, 2026 (view filing) | Jan 21 | 2 days | Jones Teresa A.Executive Vice President | SSale | −850 | $986.26 | −$838.3K | −16.7%4.23K after | |
| Jan 20, 2026 (view filing) | Jan 16 | 4 days | Decker Susan LDirector | SSale | −458 | $955.00 | −$437.4K | −5.1%8.53K after | |
| Jan 15, 2026 (view filing) | Jan 14 | 1 day | Klauer James CExecutive Vice President | SSale | −1.50K | $939.00 | −$1.41M | −3.2%44.8K after | |
| Jan 12, 2026 (view filing) | Jan 9 | 3 days | Miller Russell DSr. Executive Vice President | SSale | −1.50K | $916.32 | −$1.37M | −15.4%8.24K after | |
| Dec 31, 2025 (view filing) | Dec 29-30 | 2 days | Polit JavierExecutive Vice President | SSale | −2.61K | $866.29 | −$2.26M | −20.4%10.2K after | 2 lots |
| Nov 12, 2025 (view filing) | Nov 7 | 5 days | Wilcox William RichardExecutive Vice President | SSale | −2.40K | $930.13 | −$2.23M | −54.5%2.00K after | |
| Oct 24, 2025 (view filing) | Oct 24 | Same day | Barbre Tiffany MarieOther: Principal Accounting Officer | SSale | −1.24K | $934.62 | −$1.16M | −19.4%5.16K after |
Top 10 13F holders, Q2 2026
The largest institutional positions in Costco Wholesale Corp at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 34,202,834 | $32.0B | 0.48% | −744,206−2.1% | Reduced |
| Vanguard Capital Management LLC | 28,976,605 | $27.1B | 0.58% | +129,157+0.4% | Added |
| State Street Corp | 18,384,951 | $17.2B | 0.51% | +232,719+1.3% | Added |
| Invesco Ltd. | 13,989,137 | $13.1B | 1.04% | +359,889+2.6% | Added |
| Geode Capital Management, LLC | 10,627,472 | $9.90B | 0.53% | −31,752−0.3% | Reduced |
| Vanguard Portfolio Management LLC | 10,402,555 | $9.73B | 0.44% | −303,080−2.8% | Reduced |
| Morgan Stanley | 10,220,437 | $9.56B | 0.51% | +321,726+3.3% | Added |
| Banque Cantonale Vaudoise | 7,533 | $7.05B | 0.98% | +1,722+29.6% | Added |
| Bank of America Corp | 7,249,774 | $6.78B | 0.44% | −265,257−3.5% | Reduced |
| Norges Bank | 6,474,767 | $6.06B | 0.60% | +6,474,767 | New |