COST's three largest insider shareholders as of September 09, 2026 are W Craig Jelinek (Ceo, 204.37K shares), W Craig Jelinek (Ceo, 204.37K shares), Charles T Munger (Director, 168.10K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | W Craig Jelinek | Ceo | 204,365 | 0 | 204,365 | 24.0% | 23 Dec, 2024 |
| 2 | Charles T Munger | Director | 168,104 | 0 | 168,104 | 19.7% | 24 Oct, 2023 |
| 3 | Patrick J Callans | Executive Vice President | 60,895 | 0 | 60,895 | 7.1% | 24 Oct, 2025 |
| 4 | Hamilton E James | Chairman Of The Board | 55,538 | 0 | 55,538 | 6.5% | 24 Oct, 2025 |
| 5 | Roland Michael Vachris | President And Ceo | 52,258 | 0 | 52,258 | 6.1% | 24 Oct, 2025 |
| 6 | John Christopher Sullivan | Executive Vp | 47,671 | 0 | 47,671 | 5.6% | 24 Oct, 2025 |
| 7 | James C Klauer | Executive Vice President | 44,837 | 0 | 44,837 | 5.3% | 15 Jan, 2026 |
| 8 | James P. Murphy | Executive Vp | 38,084 | 0 | 38,084 | 4.5% | 25 Oct, 2022 |
| 9 | Timothy L. Rose | Executive Vp | 33,025 | 0 | 33,025 | 3.9% | 14 Sep, 2022 |
| 10 | Paul G Moulton | Executive Vp | 28,833 | 0 | 28,833 | 3.4% | 16 Sep, 2021 |
| 11 | Gary Millerchip | Executive Vice President | 15,465 | 0 | 15,465 | 1.8% | 13 Mar, 2026 |
| 12 | Daniel M. Hines | Other | 12,186 | 0 | 12,186 | 1.4% | 24 Oct, 2024 |
| 13 | Joseph P Portera | Executive Vp | 11,987 | 0 | 11,987 | 1.4% | 16 Sep, 2021 |
| 14 | Pierre Riel | Executive Vice President | 11,256 | 0 | 11,256 | 1.3% | 12 Sep, 2025 |
| 15 | Javier Polit | Executive Vice President | 10,190 | 0 | 10,190 | 1.2% | 31 Dec, 2025 |
| 16 | Yoram Rubanenko | Executive Vice President | 8,247 | 0 | 8,247 | 1.0% | 12 Sep, 2025 |
| 17 | Russell D Miller | Sr. Executive Vice President | 0 | 8,240 | 8,240 | 1.0% | 12 Jan, 2026 |
| 18 | Claudine Adamo | Executive Vice President | 6,121 | 0 | 6,121 | 0.7% | 11 Mar, 2026 |
| 19 | Jeffrey S Raikes | Director | 6,044 | 0 | 6,044 | 0.7% | 14 Jul, 2026 |
| 20 | Caton Frates | Executive Vice President | 5,815 | 0 | 5,815 | 0.7% | 01 Apr, 2026 |
| 21 | Tiffany Marie Barbre | Other | 5,155 | 0 | 5,155 | 0.6% | 24 Oct, 2025 |
| 22 | Kenneth D Denman | Director | 4,779 | 0 | 4,779 | 0.6% | 25 Jun, 2026 |
| 23 | Teresa A. Jones | Executive Vice President | 3,928 | 0 | 3,928 | 0.5% | 28 Jan, 2026 |
| 24 | Sarah Mr Sally Jewell | Director | 3,613 | 0 | 3,613 | 0.4% | 24 Oct, 2025 |
| 25 | Richard M Libenson | Director, Other | 3,561 | 0 | 3,561 | 0.4% | 26 Oct, 2021 |
| 26 | William Richard Wilcox | Executive Vice President | 2,000 | 0 | 2,000 | 0.2% | 12 Nov, 2025 |
| 27 | 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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| 01 Apr, 2026 | Caton Frates | Executive Vice President | Disposed S | 700 | $993.00 | $695.10K | 5,815 | Direct |
| 01 Apr, 2026 | Caton Frates | Executive Vice President | Disposed S | 700 | $993.00 | $695.10K | 5,815 | Direct |
| 01 Apr, 2026 | Caton Frates | Executive Vice President | Disposed S | 700 | $993.00 | $695.10K | 5,815 | Direct |
| 11 Mar, 2026 | Gary Millerchip | Executive Vice President | Disposed F | 1,154 | $992.23 | $1.15Mn | 15,465 | Direct |
| 12 Mar, 2026 | Sarah Catherine George | Executive Vice President | Disposed I | 642 | $991.21 | $636.48K | 0 | Indirect |
| 12 Mar, 2026 | Sarah Catherine George | Executive Vice President | Disposed I | 642 | $991.21 | $636.48K | 0 | Indirect |
| 12 Mar, 2026 | Sarah Catherine George | Executive Vice President | Disposed I | 642 | $991.21 | $636.48K | 0 | Indirect |
| 12 Mar, 2026 | Sarah Catherine George | Executive Vice President | Disposed I | 642 | $991.21 | $636.48K | 0 | Indirect |
| 09 Mar, 2026 | Claudine Adamo | Executive Vice President | Disposed S | 730 | $1,003.02 | $732.21K | 6,121 | Direct |
| 27 Jan, 2026 | Teresa A. Jones | Executive Vice President | Disposed G | 300 | $0.00 | $0 | 3,928 | Direct |
| 27 Jan, 2026 | Jeffrey S Raikes | Director | Disposed G | 5,115 | $0.00 | $0 | 11,293 | Direct |
| 27 Jan, 2026 | Teresa A. Jones | Executive Vice President | Disposed G | 300 | $0.00 | $0 | 3,928 | Direct |
| 27 Jan, 2026 | Teresa A. Jones | Executive Vice President | Disposed G | 300 | $0.00 | $0 | 3,928 | Direct |
| 27 Jan, 2026 | Teresa A. Jones | Executive Vice President | Disposed G | 300 | $0.00 | $0 | 3,928 | Direct |
| 21 Jan, 2026 | Teresa A. Jones | Executive Vice President | Disposed S | 850 | $986.26 | $838.32K | 4,228 | Direct |
| 21 Jan, 2026 | Teresa A. Jones | Executive Vice President | Disposed S | 850 | $986.26 | $838.32K | 4,228 | Direct |
| 21 Jan, 2026 | Teresa A. Jones | Executive Vice President | Disposed S | 850 | $986.26 | $838.32K | 4,228 | Direct |