24 insiders reported 105 Form 4 transactions for COSTCO WHOLESALE CORP /NEW (COST) over the past 18 months (most recent 2026-06-25). Recent activity: DENMAN KENNETH D (Director) Sell 885 shares, MILLERCHIP GARY (Executive Vice President) Sell 1,154 shares, George Sarah Catherine (Executive Vice President) Sell 642 shares, Adamo Claudine (Executive Vice President) Sell 730 shares, Jones Teresa A. (Executive Vice President) Sell 300 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-25 | DENMAN KENNETH D | Director | Sell | 885 | $847,345 |
| 2026-03-13 | MILLERCHIP GARY | Executive Vice President | Sell | 1,154 | $1.1M |
| 2026-03-13 | George Sarah Catherine | Executive Vice President | Sell | 642 | $636,486 |
| 2026-03-11 | Adamo Claudine | Executive Vice President | Sell | 730 | $732,205 |
| 2026-01-28 | Jones Teresa A. | Executive Vice President | Sell | 300 | $0 |
| 2026-01-28 | RAIKES JEFFREY S | Director | Sell | 5,115 | $0 |
| 2026-01-23 | Jones Teresa A. | Executive Vice President | Sell | 850 | $838,321 |
| 2026-01-20 | DECKER SUSAN L | Director | Sell | 458 | $437,390 |
| 2026-01-20 | Raimondo Gina Marie | Director | Buy | 215 | $0 |
| 2026-01-15 | Klauer James C | Executive Vice President | Sell | 1,500 | $1.4M |
| 2026-01-12 | Miller Russell D | Sr. Executive Vice President | Sell | 1,500 | $1.4M |
| 2025-12-31 | POLIT JAVIER | Executive Vice President | Sell | 2,049 | $1.8M |
| 2025-12-31 | POLIT JAVIER | Executive Vice President | Sell | 558 | $481,766 |
| 2025-12-22 | DENMAN KENNETH D | Director | Sell | 325 | $0 |
| 2025-12-17 | DECKER SUSAN L | Director | Sell | 2,827 | $0 |
| 2025-11-12 | Wilcox William Richard | Executive Vice President | Sell | 2,400 | $2.2M |
| 2025-11-12 | RAIKES JEFFREY S | Director | Sell | 4,120 | $0 |
| 2025-10-24 | Barbre Tiffany Marie | Insider | Buy | 2,118 | $0 |
| 2025-10-24 | Adamo Claudine | Executive Vice President | Sell | 97 | $91,577 |
| 2025-10-24 | Adamo Claudine | Executive Vice President | Sell | 199 | $187,698 |
| 2025-10-24 | Adamo Claudine | Executive Vice President | Sell | 177 | $166,887 |
| 2025-10-24 | Adamo Claudine | Executive Vice President | Sell | 111 | $104,453 |
| 2025-10-24 | Adamo Claudine | Executive Vice President | Sell | 2,700 | $2.5M |
| 2025-10-24 | Adamo Claudine | Executive Vice President | Sell | 122 | $115,043 |
| 2025-10-24 | Barbre Tiffany Marie | Insider | Sell | 114 | $107,250 |
Source: SEC Form 4 filings · as of 2026-06-25