Insider trading
Officers, directors, and 10% owners buying and selling their own company's stock, from SEC Form 4 filings. Newest first.
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| Type | Symbol | Insider | Shares | Price | Value | Traded | Filed |
|---|---|---|---|---|---|---|---|
| Grant | COST | Sullivan John Christopher Executive VP | 4,552 | — | Oct 22, 2026 | Oct 27, 2026 | |
| Tax | COST | Sullivan John Christopher Executive VP | 3,763 | $3.8M | Oct 22, 2026 | Oct 27, 2026 | |
| Tax | COST | Self Adam Webb Executive Vice President | 260 | $264K | Oct 22, 2026 | Oct 27, 2026 | |
| Grant | COST | Polit Javier Executive Vice President | 4,129 | — | Oct 22, 2026 | Oct 27, 2026 | |
| Tax | COST | Polit Javier Executive Vice President | 1,572 | $1.6M | Oct 22, 2026 | Oct 27, 2026 | |
| Grant | COST | Millerchip Gary Executive Vice President | 6,140 | — | Oct 22, 2026 | Oct 27, 2026 | |
| Tax | COST | Millerchip Gary Executive Vice President | 1,631 | $1.7M | Oct 22, 2026 | Oct 27, 2026 | |
| Grant | COST | Vachris Roland Michael President and CEO, Director | 13,973 | — | Oct 22, 2026 | Oct 27, 2026 | |
| Tax | COST | Vachris Roland Michael President and CEO, Director | 3,656 | $3.7M | Oct 22, 2026 | Oct 27, 2026 | |
| Tax | COST | Klauer James C Executive Vice President | 2,101 | $2.1M | Oct 22, 2026 | Oct 26, 2026 | |
| Tax | COST | George Sarah Catherine Executive Vice President | 260 | $264K | Oct 22, 2026 | Oct 26, 2026 | |
| Tax | COST | Adamo Claudine Executive Vice President | 692 | $704K | Oct 22, 2026 | Oct 26, 2026 |