The most recent Costco Wholesale (COST) insider transaction: William Richard Wilcox (Executive Vice President) sold 1,100 shares worth about $1.05Mn on Oct 13, 2026, reported on Form 4 on Oct 14, 2026. So far in the quarter ending Dec 31, 2026, insiders were net sellers of 1.10K shares.
Across the past 12 months, open-market trades by Costco Wholesale insiders were all sales, totaling $17.26 million (18.57K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | W Craig Jelinek | Ceo | 204,365 | 0 | 204,365 | 23.0% | 23 Dec, 2024 |
| 2 | Charles T Munger | Director | 168,104 | 0 | 168,104 | 18.9% | 24 Oct, 2023 |
| 3 | Patrick J Callans | Executive Vice President | 60,895 | 0 | 60,895 | 6.9% | 24 Oct, 2025 |
| 4 | Hamilton E James | Chairman Of The Board | 55,538 | 0 | 55,538 | 6.3% | 24 Oct, 2025 |
| 5 | Roland Michael Vachris | President And Ceo | 52,258 | 0 | 52,258 | 5.9% | 24 Oct, 2025 |
| 6 | James C Klauer | Executive Vice President | 48,030 | 0 | 48,030 | 5.4% | 14 Sep, 2026 |
| 7 | John Christopher Sullivan | Executive Vp | 47,671 | 0 | 47,671 | 5.4% | 24 Oct, 2025 |
| 8 | James P. Murphy | Executive Vp | 38,084 | 0 | 38,084 | 4.3% | 25 Oct, 2022 |
| 9 | Timothy L. Rose | Executive Vp | 33,025 | 0 | 33,025 | 3.7% | 14 Sep, 2022 |
| 10 | Richard A Galanti | Executive Vice President | 27,400 | 0 | 27,400 | 3.1% | 24 Oct, 2024 |
| 11 | John W Stanton | Director | 24,090 | 0 | 24,090 | 2.7% | 24 Oct, 2025 |
| 12 | Gary Millerchip | Executive Vice President | 15,465 | 0 | 15,465 | 1.7% | 13 Mar, 2026 |
| 13 | Pierre Riel | Executive Vice President | 14,246 | 0 | 14,246 | 1.6% | 14 Sep, 2026 |
| 14 | Daniel M. Hines | Other | 12,186 | 0 | 12,186 | 1.4% | 24 Oct, 2024 |
| 15 | Yoram Rubanenko | Executive Vice President | 10,680 | 0 | 10,680 | 1.2% | 14 Sep, 2026 |
| 16 | Javier Polit | Executive Vice President | 10,190 | 0 | 10,190 | 1.1% | 31 Dec, 2025 |
| 17 | Susan L Decker | Director | 8,532 | 0 | 8,532 | 1.0% | 20 Jan, 2026 |
| 18 | Russell D Miller | Sr. Executive Vice President | 0 | 8,240 | 8,240 | 0.9% | 12 Jan, 2026 |
| 19 | Caton Frates | Sr. Executive Vice President | 7,912 | 0 | 7,912 | 0.9% | 30 Sep, 2026 |
| 20 | Claudine Adamo | Executive Vice President | 7,134 | 0 | 7,134 | 0.8% | 30 Sep, 2026 |
| 21 | Teresa A. Jones | Executive Vice President | 6,598 | 0 | 6,598 | 0.7% | 14 Sep, 2026 |
| 22 | Jeffrey S Raikes | Director | 6,044 | 0 | 6,044 | 0.7% | 14 Jul, 2026 |
| 23 | Tiffany Marie Barbre | Other | 5,155 | 0 | 5,155 | 0.6% | 24 Oct, 2025 |
| 24 | Kenneth D Denman | Director | 4,779 | 0 | 4,779 | 0.5% | 25 Jun, 2026 |
| 25 | Sarah Mr Sally Jewell | Director | 3,613 | 0 | 3,613 | 0.4% | 24 Oct, 2025 |
| 26 | Mary Agnes Wilderotter | Director | 3,205 | 0 | 3,205 | 0.4% | 24 Oct, 2025 |
| 27 | William Richard Wilcox | Executive Vice President | 3,094 | 0 | 3,094 | 0.3% | 14 Oct, 2026 |
| 28 | Helena Foulkes | Director | 1,087 | 0 | 1,087 | 0.1% | 24 Oct, 2025 |
| 29 | Gina Marie Raimondo | Director | 215 | 0 | 215 | 0.0% | 20 Jan, 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 |
|---|---|---|---|---|---|---|---|---|
| 13 Oct, 2026 | William Richard Wilcox | Executive Vice President | Disposed S | 1,100 | $958.21 | $1.05Mn | 3,094 | Direct |
| 29 Sep, 2026 | Claudine Adamo | Executive Vice President | Disposed S | 2,200 | $915.93 | $2.02Mn | 7,134 | Direct |
| 29 Sep, 2026 | Caton Frates | Sr. Executive Vice President | Disposed S | 801 | $915.93 | $733.33K | 7,912 | Direct |
| 10 Sep, 2026 | Claudine Adamo | Executive Vice President | Acquired A | 4,129 | $0.00 | $0 | 10,250 | Direct |
| 10 Sep, 2026 | Yoram Rubanenko | Executive Vice President | Acquired A | 4,129 | $0.00 | $0 | 12,376 | Direct |
| 10 Sep, 2026 | Teresa A. Jones | Executive Vice President | Acquired A | 4,129 | $0.00 | $0 | 8,057 | Direct |
| 10 Sep, 2026 | Pierre Riel | Executive Vice President | Acquired A | 4,552 | $0.00 | $0 | 15,808 | Direct |
| 10 Sep, 2026 | James C Klauer | Executive Vice President | Acquired A | 4,129 | $0.00 | $0 | 48,966 | Direct |
| 10 Sep, 2026 | William Richard Wilcox | Executive Vice President | Acquired A | 4,129 | $0.00 | $0 | 6,129 | Direct |
| 10 Sep, 2026 | Caton Frates | Executive Vice President | Acquired A | 4,552 | $0.00 | $0 | 10,367 | Direct |
| 10 Sep, 2026 | Teresa A. Jones | Executive Vice President | Disposed F | 1,459 | $902.38 | $1.32Mn | 6,598 | Direct |
| 10 Sep, 2026 | Caton Frates | Executive Vice President | Disposed F | 1,654 | $902.38 | $1.49Mn | 8,713 | Direct |
| 10 Sep, 2026 | Yoram Rubanenko | Executive Vice President | Disposed F | 1,696 | $902.38 | $1.53Mn | 10,680 | Direct |
| 10 Sep, 2026 | Pierre Riel | Executive Vice President | Disposed F | 1,562 | $902.38 | $1.41Mn | 14,246 | Direct |
| 10 Sep, 2026 | James C Klauer | Executive Vice President | Disposed F | 936 | $902.38 | $844.73K | 48,030 | Direct |
| 10 Sep, 2026 | William Richard Wilcox | Executive Vice President | Disposed F | 1,935 | $902.38 | $1.75Mn | 4,194 | Direct |
| 10 Sep, 2026 | Claudine Adamo | Executive Vice President | Disposed F | 917 | $902.38 | $827.20K | 9,334 | Direct |
| 10 Jul, 2026 | Jeffrey S Raikes | Director | Disposed G | 5,249 | $0.00 | $0 | 6,044 | Direct |
| 23 Jun, 2026 | Kenneth D Denman | Director | Disposed S | 885 | $957.45 | $847.35K | 4,779 | Direct |
| 01 Apr, 2026 | Caton Frates | Executive Vice President | Disposed S | 700 | $993.00 | $695.10K | 5,815 | Direct |