Costco COST
$1,053.56 −$12.03 (-1.13%)
Market closed · Nov 6, 8:10 pm ET · Last extended-hours $1,052.57 -0.09%
Open$1,045.25
Prev close$1,065.59
Day range$1,043.00 – $1,063.02
Volume2.51M
Market cap$466.86B
P/E (TTM)50.7
Dividend yield0.53%
Ownership & positioning
Who holds it, who is betting against it, and where the big money is moving
Institutional ownership73.5%-0.14 pts vs. prior quarter
Institutions holding4,699-16 vs. prior quarter
Insider trades (recent)23 buys / 26 sellsNet selling
Short interest1.72% of floatDays to cover 3.7 · as of 15 Oct 2026
Short-sale volume share11.9%5-day average of daily volume
Short-sale volume as % of daily volume
Large-order net flow, last 20 sessions
Net of large-order buying minus selling, in USD. Over this window: +$89.86M (13 inflow days, 7 outflow days).
Net flow by order size, last 20 sessions
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 24.4% of shares outstanding.
Largest holders
By investor type
Reported short interest has held roughly steady near 1.72% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).
Recent institutional activity
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| SG Americas Securities, LLC | Private Company | 2026/Q3 | +955,931 | 0.4% |
| Marshall Wace LLP | Hedge Fund | 2026/Q3 | +910,725 | 0.3% |
| Norges Bank Investment Management | Sovereign Wealth Fund | 2026/Q3 | +449,980 | 1.5% |
| RBC Global Asset Management Inc. | Mutual Fund | 2026/Q3 | +388,042 | 0.2% |
| Invesco Capital Management LLC | Mutual Fund | 2026/Q3 | +383,251 | 3.0% |
| UBS Asset Management | Mutual Fund | 2026/Q3 | +356,486 | 1.3% |
| Acadian Asset Management LLC | Mutual Fund | 2026/Q3 | +325,800 | 0.3% |
| Ninety One UK Limited | Mutual Fund | 2026/Q3 | +314,456 | 0.1% |
| Morgan Stanley | Public Company | 2026/Q3 | +311,909 | 1.5% |
| Citigroup Inc. | Public Company | 2026/Q3 | +268,045 | 0.2% |
| Hudson River Trading LLC | Private Company | 2026/Q3 | +241,658 | 0.1% |
| State Street Global Advisors | Mutual Fund | 2026/Q3 | +232,719 | 4.1% |
| Charles Schwab Investment Management | Mutual Fund | 2026/Q3 | +231,372 | 0.8% |
| AQR Capital Management | Hedge Fund | 2026/Q3 | +220,143 | 0.3% |
| Susquehanna International Group, LLP | Private Company | 2026/Q3 | +217,370 | 0.1% |
Institutional buy/sell activity by reporting period, largest moves first.
Insider transactions
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 21 Oct 2026 | Jeffrey Raikes | Independent Director | Other Acquisition | +266 | – | 577 |
| 21 Oct 2026 | Kenneth Denman | Independent Vice Chairperson | Other Acquisition | +266 | – | 558 |
| 21 Oct 2026 | Susan Decker | Independent Director | Other Acquisition | +266 | – | 558 |
| 21 Oct 2026 | Mary Wilderotter | Independent Director | Other Acquisition | +266 | – | 558 |
| 21 Oct 2026 | John Stanton | Independent Director | Other Acquisition | +266 | – | 558 |
| 21 Oct 2026 | Hamilton James | Independent Chairperson | Other Acquisition | +266 | – | 56,397 |
| 21 Oct 2026 | Sarah Margaret Jewell | Independent Director | Other Acquisition | +266 | – | 576 |
| 21 Oct 2026 | Gina Raimondo | Independent Director | Other Acquisition | +266 | – | 409 |
| 21 Oct 2026 | Helena Foulkes | Independent Director | Other Acquisition | +266 | – | 558 |
| 21 Oct 2026 | Ron Vachris | Chief Executive Officer | Sale to Issuer | -3,655 | $1,018.21 | 62,575 |
| 21 Oct 2026 | Ron Vachris | Chief Executive Officer | Other Acquisition | +13,973 | – | 62,575 |
| 21 Oct 2026 | Gary Millerchip | Chief Financial Officer | Sale to Issuer | -1,630 | $1,018.21 | 7,285 |
| 21 Oct 2026 | Gary Millerchip | Chief Financial Officer | Other Acquisition | +6,140 | – | 12,689 |
| 21 Oct 2026 | John Sullivan | General Counsel | Sale to Issuer | -3,763 | $1,018.21 | 37,469 |
| 21 Oct 2026 | John Sullivan | General Counsel | Other Acquisition | +910 | – | 37,469 |
| 21 Oct 2026 | John Sullivan | General Counsel | Other Acquisition | +3,641 | – | 10,991 |
| 21 Oct 2026 | James Klauer | Executive Vice President | Sale to Issuer | -2,101 | $1,018.21 | 46,027 |
| 21 Oct 2026 | Javier Polit | Executive VP and CI&DO of Information Systems | Sale to Issuer | -1,571 | $1,018.21 | 3,295 |
| 21 Oct 2026 | Javier Polit | Executive VP and CI&DO of Information Systems | Other Acquisition | +1,376 | – | 3,295 |
| 21 Oct 2026 | Javier Polit | Executive VP and CI&DO of Information Systems | Other Acquisition | +2,752 | – | 9,452 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
Short interest, by report
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Oct 2026 | 7,600,821 | 1.7% | 3.7 |
| 30 Sep 2026 | 7,325,824 | 1.7% | 2.7 |
| 15 Sep 2026 | 7,360,574 | 1.7% | 3.7 |
| 31 Aug 2026 | 7,577,940 | 1.7% | 4.1 |
| 14 Aug 2026 | 7,364,782 | 1.7% | 4.4 |
| 31 Jul 2026 | 7,655,966 | 1.7% | 3.8 |
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