COST · Insider Trading
Costco Wholesale Corp
Every open-market purchase and sale reported by COST officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Form 4 Filings
50
most recent
Open-Market Buys
0
code P
Sales
13
code S
Reporting Insiders
25
current holders
COST — Recent Form 4 Transactions (latest 2026-09-30)
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-30 | Claudine Adamo | Executive Vice President | Sell | −2,200 | −$2.02M |
| 2026-09-30 | Caton Frates | Sr. Executive Vice President | Sell | −800 | −$733.33K |
| 2026-09-14 | Claudine Adamo | Executive Vice President | MIXED | +3,212 | −$827.20K |
| 2026-09-14 | Teresa A. Jones | Executive Vice President | MIXED | +2,670 | −$1.32M |
| 2026-09-14 | Yoram Rubanenko | Executive Vice President | MIXED | +2,433 | −$1.53M |
| 2026-09-14 | William Richard Wilcox | Executive Vice President | MIXED | +2,194 | −$1.75M |
| 2026-09-14 | James C Klauer | Executive Vice President | MIXED | +3,192 | −$844.73K |
| 2026-09-14 | Pierre Riel | Executive Vice President | MIXED | +2,990 | −$1.41M |
| 2026-09-14 | Caton Frates | Executive Vice President | MIXED | +2,897 | −$1.49M |
| 2026-07-14 | Jeffrey S Raikes | Director | G | −5,249 | — |
| 2026-06-25 | Kenneth D Denman | Director | Sell | −885 | −$847.35K |
| 2026-04-01 | Caton Frates | Executive Vice President | Sell | −700 | −$695.10K |
| 2026-03-13 | Gary Millerchip | Executive Vice President | F | −1,154 | −$1.15M |
| 2026-03-13 | Sarah Catherine George | Executive Vice President | I | −642 | −$636.48K |
| 2026-03-11 | Claudine Adamo | Executive Vice President | Sell | −730 | −$732.21K |
| 2026-01-28 | Teresa A. Jones | Executive Vice President | G | −300 | — |
| 2026-01-28 | Jeffrey S Raikes | Director | G | −5,115 | — |
| 2026-01-23 | Teresa A. Jones | Executive Vice President | Sell | −850 | −$838.32K |
| 2026-01-20 | Gina Marie Raimondo | Director | A | +215 | — |
| 2026-01-20 | Susan L Decker | Director | Sell | −458 | −$437.39K |
| 2026-01-15 | James C Klauer | Executive Vice President | Sell | −1,500 | −$1.41M |
| 2026-01-12 | Russell D Miller | Sr. Executive Vice President | Sell | −1,500 | −$1.37M |
| 2025-12-31 | Javier Polit | Executive Vice President | Sell | −2,607 | −$2.26M |
| 2025-12-22 | Kenneth D Denman | Director | G | −325 | — |
| 2025-12-17 | Susan L Decker | Director | G | −2,827 | — |
| 2025-11-12 | William Richard Wilcox | Executive Vice President | Sell | −2,400 | −$2.23M |
| 2025-11-12 | Jeffrey S Raikes | Director | G | −4,120 | — |
| 2025-10-24 | Susan L Decker | Director | A | +286 | — |
| 2025-10-24 | Kenneth D Denman | Director | A | +286 | — |
| 2025-10-24 | Helena Foulkes | Director | A | +286 | — |
| 2025-10-24 | Hamilton E James | Director | A | +286 | — |
| 2025-10-24 | Sarah Mr Sally Jewell | Director | A | +286 | — |
| 2025-10-24 | Jeffrey S Raikes | Director | A | +286 | — |
| 2025-10-24 | Mary Agnes Wilderotter | Director | A | +286 | — |
| 2025-10-24 | John W Stanton | Director | A | +286 | — |
| 2025-10-24 | Claudine Adamo | Executive Vice President | MIXED | −3,404 | −$3.19M |
| 2025-10-24 | Patrick J Callans | Executive Vice President | F | −916 | −$866.22K |
| 2025-10-24 | Caton Frates | Executive Vice President | F | −2,768 | −$2.62M |
| 2025-10-24 | James C Klauer | Executive Vice President | F | −917 | −$866.60K |
| 2025-10-24 | Gary Millerchip | Executive Vice President | MIXED | +5,454 | −$768.37K |
| 2025-10-24 | Javier Polit | Executive Vice President | MIXED | +3,050 | −$1.10M |
| 2025-10-24 | John Christopher Sullivan | Executive VP | MIXED | +2,140 | −$2.37M |
| 2025-10-24 | Roland Michael Vachris | President and CEO | MIXED | +11,181 | −$2.51M |
| 2025-10-24 | Tiffany Marie Barbre | — | MIXED | +336 | −$1.67M |
| 2025-10-01 | Russell D Miller | Sr. Executive Vice President | Sell | −3,381 | −$3.09M |
| 2025-09-30 | Caton Frates | Executive Vice President | Sell | −1,540 | −$1.40M |
| 2025-09-24 | Russell D Miller | Sr. Executive Vice President | G | — | — |
| 2025-09-12 | Claudine Adamo | Executive Vice President | MIXED | +3,269 | −$908.16K |
| 2025-09-12 | Patrick J Callans | Executive Vice President | MIXED | +3,269 | −$908.16K |
| 2025-09-12 | Caton Frates | Executive Vice President | MIXED | +2,947 | −$1.22M |
COST — Current Insider Holders
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| W Craig Jelinek | Director | 214,365 | $197.36M |
| Patrick J Callans | Executive Vice President | 60,894 | $56.06M |
| Hamilton E James | Chairman of the Board | 55,767 | $51.34M |
| Roland Michael Vachris | President and CEO | 54,910 | $50.55M |
| James C Klauer | Executive Vice President | 49,064 | $45.17M |
| John Christopher Sullivan | Executive VP | 47,671 | $43.89M |
| Richard A Galanti | Executive Vice President | 34,400 | $31.67M |
| John W Stanton | Director | 24,300 | $22.37M |
| Gary Millerchip | Executive Vice President | 15,465 | $14.24M |
| Pierre Riel | Executive Vice President | 14,246 | $13.12M |
| Daniel M. Hines | — | 13,772 | $12.68M |
| Mary Agnes Wilderotter | Director | 12,956 | $11.93M |
| Yoram Rubanenko | Executive Vice President | 12,376 | $11.39M |
| Javier Polit | Executive Vice President | 10,747 | $9.90M |
| Susan L Decker | Director | 8,531 | $7.85M |
| Russell D Miller | Sr. Executive Vice President | 8,240 | $7.59M |
| Teresa A. Jones | Executive Vice President | 8,056 | $7.42M |
| Caton Frates | Sr. Executive Vice President | 7,912 | $7.28M |
| Claudine Adamo | Executive Vice President | 7,133 | $6.57M |
| Tiffany Marie Barbre | — | 6,735 | $6.20M |
| William Richard Wilcox | Executive Vice President | 6,129 | $5.64M |
| Jeffrey S Raikes | Director | 6,043 | $5.56M |
| Kenneth D Denman | Director | 4,778 | $4.40M |
| Sarah Mr Sally Jewell | Director | 3,612 | $3.33M |
| Sarah Catherine George | Executive Vice President | 1,401 | $1.29M |
COST Insider Trading FAQ
Who are the insiders at COST?
25 officers, directors and 10%+ beneficial owners currently report holdings in COST via SEC Form 4.
Are COST insiders buying or selling?
Across the 50 most recent Form 4 filings for COST, 0 were open-market purchases (code P) and 13 were sales (code S). Sales frequently reflect scheduled 10b5-1 plans or tax withholding rather than a view on the stock.
How current is COST insider data?
Form 4 must be filed within two business days of the transaction, so this is close to real time. The most recent COST filing is dated 2026-09-30.
How to read Form 4 activity
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the COST quote page; the site-wide leaderboard is on the insider transactions hub.
More on COST
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.