The most recent Costco Wholesale (COST) insider transaction: James C Klauer (Executive Vice President) had 190.68 shares withheld to cover tax worth about $194.15K on Oct 22, 2026, reported on Form 4 on Oct 26, 2026. So far in the quarter ending Dec 31, 2026, insiders were net sellers of 10.69K shares.
Across the past 12 months, open-market trades by Costco Wholesale insiders were all sales, totaling $14.63 million (15.73K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | W Craig Jelinek | Ceo | 204,365 | 0 | 204,365 | 22.2% | 23 Dec, 2024 |
| 2 | Charles T Munger | Director | 168,104 | 0 | 168,104 | 18.3% | 24 Oct, 2023 |
| 3 | Roland Michael Vachris | President And Ceo | 62,575 | 0 | 62,575 | 6.8% | 26 Oct, 2026 |
| 4 | Patrick J Callans | Executive Vice President | 60,895 | 0 | 60,895 | 6.6% | 24 Oct, 2025 |
| 5 | Hamilton E James | Chairman Of The Board | 55,804 | 0 | 55,804 | 6.1% | 26 Oct, 2026 |
| 6 | John Christopher Sullivan | Executive Vp | 48,460 | 0 | 48,460 | 5.3% | 26 Oct, 2026 |
| 7 | James C Klauer | Executive Vice President | 45,929 | 0 | 45,929 | 5.0% | 26 Oct, 2026 |
| 8 | James P. Murphy | Executive Vp | 38,084 | 0 | 38,084 | 4.1% | 25 Oct, 2022 |
| 9 | Timothy L. Rose | Executive Vp | 33,025 | 0 | 33,025 | 3.6% | 14 Sep, 2022 |
| 10 | Richard A Galanti | Executive Vice President | 27,400 | 0 | 27,400 | 3.0% | 24 Oct, 2024 |
| 11 | John W Stanton | Director | 24,356 | 0 | 24,356 | 2.6% | 26 Oct, 2026 |
| 12 | Gary Millerchip | Executive Vice President | 19,975 | 0 | 19,975 | 2.2% | 26 Oct, 2026 |
| 13 | Pierre Riel | Executive Vice President | 14,246 | 0 | 14,246 | 1.5% | 14 Sep, 2026 |
| 14 | Javier Polit | Executive Vice President | 12,747 | 0 | 12,747 | 1.4% | 26 Oct, 2026 |
| 15 | Daniel M. Hines | Other | 12,186 | 0 | 12,186 | 1.3% | 24 Oct, 2024 |
| 16 | Yoram Rubanenko | Executive Vice President | 10,680 | 0 | 10,680 | 1.2% | 14 Sep, 2026 |
| 17 | Susan L Decker | Director | 8,798 | 0 | 8,798 | 1.0% | 26 Oct, 2026 |
| 18 | Mary Agnes Wilderotter | Director | 8,527 | 0 | 8,527 | 0.9% | 26 Oct, 2026 |
| 19 | Russell D Miller | Sr. Executive Vice President | 0 | 8,240 | 8,240 | 0.9% | 12 Jan, 2026 |
| 20 | Caton Frates | Sr. Executive Vice President | 7,912 | 0 | 7,912 | 0.9% | 30 Sep, 2026 |
| 21 | Teresa A. Jones | Executive Vice President | 6,598 | 0 | 6,598 | 0.7% | 14 Sep, 2026 |
| 22 | Tiffany Marie Barbre | Other | 6,584 | 0 | 6,584 | 0.7% | 26 Oct, 2026 |
| 23 | Claudine Adamo | Executive Vice President | 6,442 | 0 | 6,442 | 0.7% | 26 Oct, 2026 |
| 24 | Jeffrey S Raikes | Director | 6,310 | 0 | 6,310 | 0.7% | 26 Oct, 2026 |
| 25 | Kenneth D Denman | Director | 5,045 | 0 | 5,045 | 0.5% | 26 Oct, 2026 |
| 26 | Sarah Mr Sally Jewell | Director | 3,879 | 0 | 3,879 | 0.4% | 26 Oct, 2026 |
| 27 | Sarah Catherine George | Executive Vice President | 3,868 | 0 | 3,868 | 0.4% | 26 Oct, 2026 |
| 28 | Adam Webb Self | Executive Vice President | 3,270 | 0 | 3,270 | 0.4% | 26 Oct, 2026 |
| 29 | William Richard Wilcox | Executive Vice President | 3,094 | 0 | 3,094 | 0.3% | 14 Oct, 2026 |
| 30 | Helena Foulkes | Director | 1,353 | 0 | 1,353 | 0.1% | 26 Oct, 2026 |
| 31 | Gina Marie Raimondo | Director | 481 | 0 | 481 | 0.1% | 26 Oct, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 22 Oct, 2026 | James C Klauer | Executive Vice President | Disposed F | 191 | $1,018.21 | $194.15K | 47,839 | Direct |
| 22 Oct, 2026 | Mary Agnes Wilderotter | Director | Acquired A | 266 | $0.00 | $0 | 8,527 | Direct |
| 22 Oct, 2026 | Tiffany Marie Barbre | Other | Acquired A | 1,965 | $0.00 | $0 | 7,120 | Direct |
| 22 Oct, 2026 | Sarah Catherine George | Executive Vice President | Disposed F | 60 | $1,018.21 | $61.08K | 4,068 | Direct |
| 22 Oct, 2026 | Kenneth D Denman | Director | Acquired A | 266 | $0.00 | $0 | 5,045 | Direct |
| 22 Oct, 2026 | Sarah Mr Sally Jewell | Director | Acquired A | 266 | $0.00 | $0 | 3,879 | Direct |
| 22 Oct, 2026 | Helena Foulkes | Director | Acquired A | 266 | $0.00 | $0 | 1,353 | Direct |
| 22 Oct, 2026 | Claudine Adamo | Executive Vice President | Disposed F | 97 | $1,018.21 | $98.71K | 7,037 | Direct |
| 22 Oct, 2026 | Gary Millerchip | Executive Vice President | Acquired A | 6,140 | $0.00 | $0 | 21,605 | Direct |
| 22 Oct, 2026 | Gina Marie Raimondo | Director | Acquired A | 266 | $0.00 | $0 | 481 | Direct |
| 22 Oct, 2026 | John W Stanton | Director | Acquired A | 266 | $0.00 | $0 | 24,356 | Direct |
| 22 Oct, 2026 | Jeffrey S Raikes | Director | Acquired A | 266 | $0.00 | $0 | 6,310 | Direct |
| 22 Oct, 2026 | Hamilton E James | Director | Acquired A | 266 | $0.00 | $0 | 55,804 | Direct |
| 22 Oct, 2026 | Roland Michael Vachris | President And Ceo | Acquired A | 13,973 | $0.00 | $0 | 66,231 | Direct |
| 22 Oct, 2026 | Susan L Decker | Director | Acquired A | 266 | $0.00 | $0 | 8,798 | Direct |
| 22 Oct, 2026 | Gary Millerchip | Executive Vice President | Disposed F | 313 | $1,018.21 | $319.16K | 21,292 | Direct |
| 22 Oct, 2026 | Claudine Adamo | Executive Vice President | Disposed F | 198 | $1,018.21 | $201.90K | 6,838 | Direct |
| 22 Oct, 2026 | Roland Michael Vachris | President And Ceo | Disposed F | 1,404 | $1,018.21 | $1.43Mn | 64,827 | Direct |
| 22 Oct, 2026 | James C Klauer | Executive Vice President | Disposed F | 396 | $1,018.21 | $403.39K | 47,443 | Direct |
| 22 Oct, 2026 | Sarah Catherine George | Executive Vice President | Disposed F | 62 | $1,018.21 | $63.60K | 4,005 | Direct |