Costco Wholesale Corporation (COST) Ownership
COST ownership summary
as of October 18, 2026- Institutions
- 74.4% of shares outstanding
- Insiders
- 0.08% of shares outstanding
- Shares outstanding
- 443.1M
- Float
- 442.3M shares available to trade
- Short interest
- 1.65% 7.3M shares short
- Days to cover
- 3.09 short interest down 0.5% vs prior month
- Institutions 74.40%
- Insiders 0.08%
- Other investors 25.52%
COST top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 7.72% | 34.2M | $33.83B | −744,206 (−2.1%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.54% | 29.0M | $28.66B | +129,157 (+0.4%) | June 30, 2026 |
| 3 | State Street Corp | 4.15% | 18.4M | $18.18B | +232,719 (+1.3%) | June 30, 2026 |
| 4 | Amvescap Plc. | 3.16% | 14.0M | $13.84B | +359,889 (+2.6%) | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 2.40% | 10.6M | $10.51B | −31,752 (−0.3%) | June 30, 2026 |
| 6 | Vanguard Portfolio Management, LLC | 2.35% | 10.4M | $10.29B | −303,080 (−2.8%) | June 30, 2026 |
| 7 | Morgan Stanley - Brokerage Accounts | 2.31% | 10.2M | $10.11B | +321,726 (+3.3%) | June 30, 2026 |
| 8 | Bank of America Corp | 1.64% | 7.2M | $7.17B | −265,257 (−3.5%) | June 30, 2026 |
| 9 | NORGES BANK | 1.46% | 6.5M | $6.40B | +449,980 (+7.5%) | June 30, 2026 |
| 10 | FMR Inc | 1.39% | 6.2M | $6.10B | −555,048 (−8.3%) | June 30, 2026 |
| 11 | Northern Trust Corp | 1.09% | 4.8M | $4.78B | −92,188 (−1.9%) | June 30, 2026 |
| 12 | Royal Bank of Canada | 0.97% | 4.3M | $4.25B | +533,261 (+14.2%) | June 30, 2026 |
| 13 | JPMorgan Chase & Co | 0.95% | 4.2M | $4.18B | +184,275 (+4.6%) | June 30, 2026 |
| 14 | Charles Schwab Investment Management Inc | 0.82% | 3.6M | $3.59B | +231,372 (+6.8%) | June 30, 2026 |
| 15 | The Goldman Sachs Group Inc | 0.74% | 3.3M | $3.26B | +79,925 (+2.5%) | June 30, 2026 |
| 16 | Fisher Asset Management, LLC | 0.73% | 3.3M | $3.22B | +33,184 (+1.0%) | June 30, 2026 |
| 17 | Bank of New York Mellon Corp | 0.73% | 3.2M | $3.18B | −176,566 (−5.2%) | June 30, 2026 |
| 18 | Nuveen, LLC | 0.72% | 3.2M | $3.16B | +115,824 (+3.8%) | June 30, 2026 |
| 19 | Wells Fargo & Co | 0.70% | 3.1M | $3.07B | −5,704 (−0.2%) | June 30, 2026 |
| 20 | UBS Asset Mgmt Americas Inc | 0.69% | 3.1M | $3.03B | +160,893 (+5.5%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 2.8M shares and 8 cut 2.2M.
COST top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.18% | 14.1M | $13.95B | −27,500 (−0.2%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.63% | 11.6M | $11.52B | −137,064 (−1.2%) | September 30, 2026 |
| 3 | Invesco QQQ Trust | 2.09% | 9.3M | $9.16B | −15,114 (−0.2%) | September 30, 2026 |
| 4 | iShares Core S&P 500 ETF | 1.33% | 5.9M | $5.84B | −9,509 (−0.2%) | September 30, 2026 |
| 5 | Fidelity 500 Index | 1.30% | 5.8M | $5.70B | +22,118 (+0.4%) | August 31, 2026 |
| 6 | State Street® SPDR® S&P 500® ETF | 1.23% | 5.4M | $5.38B | — | September 30, 2026 |
| 7 | Vanguard MStar Growth Index Investor | 1.06% | 4.7M | $4.63B | +39,368 (+0.8%) | September 30, 2026 |
| 8 | Vanguard Dividend Appreciation ETF | 0.57% | 2.5M | $2.48B | −2,295 (−0.1%) | September 30, 2026 |
| 9 | Vanguard Institutional Index I | 0.53% | 2.3M | $2.32B | −25,920 (−1.1%) | September 30, 2026 |
| 10 | Invesco NASDAQ 100 ETF | 0.46% | 2.0M | $2.02B | +4,788 (+0.2%) | September 30, 2026 |
| 11 | American Funds Growth Fd of Amer A | 0.34% | 1.5M | $1.47B | — | September 30, 2026 |
| 12 | State Street®CnsmrStpSelSectSPDR®ETF | 0.31% | 1.4M | $1.34B | −26,928 (−1.9%) | September 30, 2026 |
| 13 | American Funds New Perspective A | 0.27% | 1.2M | $1.18B | −50,000 (−4.0%) | September 30, 2026 |
| 14 | State Street® SPDR® Port S&P 500® ETF | 0.26% | 1.2M | $1.15B | −780 (−0.1%) | September 30, 2026 |
| 15 | Vanguard Consumer Staples ETF | 0.26% | 1.2M | $1.15B | −17,938 (−1.5%) | September 30, 2026 |
| 16 | iShares Core S&P 500 ETF USD Acc | 0.24% | 1.1M | $1.05B | +244 (+0.0%) | September 30, 2026 |
| 17 | Schwab® S&P 500 Index | 0.22% | 996K | $984.7M | +854 (+0.1%) | September 30, 2026 |
| 18 | American Funds Washington Mutual A | 0.21% | 939K | $928.5M | −4,322 (−0.5%) | September 30, 2026 |
| 19 | Fidelity Total Market Index | 0.19% | 847K | $837.8M | +2,605 (+0.3%) | August 31, 2026 |
| 20 | Invesco S&P 500® Quality ETF | 0.18% | 791K | $782.1M | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
COST insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-09 | Claudine Adamo | Sell | $1,003.02 | 730 | $732,205 |
| 2026-02-24 | Ro Khanna | Buy | $998.12 | — | — |
| 2026-01-30 | Gilbert Ray Cisneros, Jr. | Buy | $940.25 | — | — |
| 2026-01-21 | Teresa A Jones | Sell | $986.26 | 850 | $838,321 |
| 2026-01-16 | Susan L Decker | Sell | $955.00 | 458 | $437,390 |
| 2026-01-14 | James C Klauer | Sell | $939.00 | 1,500 | $1.4M |
| 2026-01-09 | Russell D Miller | Sell | $916.32 | 1,500 | $1.4M |
| 2026-01-06 | Ro Khanna | Buy | $889.10 | — | — |
| 2025-12-30 | Javier Polit | Sell | $862.89 | 558 | $481,493 |
| 2025-12-29 | Javier Polit | Sell | $867.21 | 2,049 | $1.8M |
| 2025-12-29 | Markwayne Mullin | Buy | $867.84 | — | — |
| 2025-12-24 | Gilbert Ray Cisneros, Jr. | Sell | $872.75 | — | — |
| 2025-11-10 | Ro Khanna | Buy | $915.56 | — | — |
| 2025-11-07 | William Richard Wilcox | Sell | $930.13 | 2,400 | $2.2M |
| 2025-11-05 | Richard McCormick | Buy | $935.03 | — | — |
| 2025-11-03 | Ro Khanna | Buy | $928.04 | — | — |
| 2025-10-24 | Claudine Adamo | Sell | $935.68 | 2,700 | $2.5M |
| 2025-10-24 | Tiffany Marie Barbre | Sell | $934.62 | 1,239 | $1.2M |
| 2025-10-17 | Gilbert Ray Cisneros, Jr. | Buy | $936.33 | — | — |
| 2025-10-17 | Shelley Moore Capito | Sell | $936.33 | — | — |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
COST shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns COST
Institutional investors own 74.4% of Costco's shares and insiders 0.08%. The largest holder is BlackRock Inc with 7.72% of the shares (34.2M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 1.65% of the float, or 3.09 days of average trading volume.
Related: COST analyst forecast, COST key metrics, COST dividend history. See the COST stock overview for the latest quote and news.
COST ownership FAQ
Who owns the most Costco stock?
The largest shareholders of Costco are BlackRock Inc (7.72%), Vanguard Capital Management, LLC (6.54%), State Street Corp (4.15%), Amvescap Plc. (3.16%), Geode Capital Management, LLC (2.40%).
What percentage of Costco is owned by institutions?
Institutions hold 74.4% of Costco's shares outstanding; insiders hold 0.08%.
Which funds own Costco?
The largest fund holders of Costco are Vanguard MStar Total Stk Mkt Idx Invest (3.18%), Vanguard 500 Index Investor (2.63%), Invesco QQQ Trust (2.09%), iShares Core S&P 500 ETF (1.33%), Fidelity 500 Index (1.30%).
What is Costco's short interest?
7.3M shares of Costco were sold short, 1.65% of the float; at the average daily volume it would take 3.09 days to cover.
Are insiders buying or selling Costco?
Of the latest 20 reported insider transactions in Costco (since October 17, 2025), 8 were purchases and 12 were sales.
How many shares of Costco are outstanding?
Costco has 443.1M shares outstanding, of which 442.3M are in the public float.