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COST Costco Wholesale Corp
Insider figures are trailing 90 days, open-market Form 4 only. Institutional figures are the latest reported quarter. These windows are not simultaneous.
-$2.7M net selling - trailing 90 days
0 buyers - 2 unique sellers
Historical context: most recent complete month (2026-09) is the 35th percentile of this ticker's monthly net P/S flow over 24 complete months. Lower percentiles are more selling; higher are more buying. P10–P90: -$5.2M to $0.
Institutional activity: not available - insufficient comparable institutions for the latest complete quarter.
open-market Form 4 only - grants, exercises, tax withholding excluded. ~ derived from SEC-reported shares x price.
Institutional activity: not available - insufficient comparable institutions for the latest complete quarter.
Who is responsible
| Insider | Role | Net activity | Rows |
|---|---|---|---|
| Adamo Claudine | Executive Vice President | -~$2.0M | 1 |
| Frates Caton | Sr. Executive Vice President | -~$0.7M | 1 |
Transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| September 29, 2026 | Adamo Claudine | Executive Vice President | S | -2200 | 915.93 | ~$2.0M |
| September 29, 2026 | Frates Caton | Sr. Executive Vice President | S | -800.638 | 915.93 | ~$0.7M |
| June 23, 2026 | DENMAN KENNETH D | — | S | -885 | 957.4525 | ~$0.8M |
| April 1, 2026 | Frates Caton | Executive Vice President | S | -700 | 993 | ~$0.7M |
| March 9, 2026 | Adamo Claudine | Executive Vice President | S | -730 | 1003.021 | ~$0.7M |
| January 21, 2026 | Jones Teresa A. | Executive Vice President | S | -850 | 986.2567 | ~$0.8M |
| January 16, 2026 | DECKER SUSAN L | — | S | -458 | 955 | ~$0.4M |
| January 14, 2026 | Klauer James C | Executive Vice President | S | -1500 | 939 | ~$1.4M |
| January 9, 2026 | Miller Russell D | Sr. Executive Vice President | S | -1500 | 916.32 | ~$1.4M |
| December 30, 2025 | POLIT JAVIER | Executive Vice President | S | -558.305 | 862.895 | ~$0.5M |
| December 29, 2025 | POLIT JAVIER | Executive Vice President | S | -2049 | 867.2054 | ~$1.8M |
| November 7, 2025 | Wilcox William Richard | Executive Vice President | S | -2400 | 930.13 | ~$2.2M |
| October 24, 2025 | Barbre Tiffany Marie | — | S | -1239.383 | 934.6204 | ~$1.2M |
| October 24, 2025 | Adamo Claudine | Executive Vice President | S | -2700 | 935.68 | ~$2.5M |
| September 29, 2025 | Miller Russell D | Sr. Executive Vice President | S | -3381 | 915 | ~$3.1M |
| September 29, 2025 | Frates Caton | Executive Vice President | S | -1540 | 910.02 | ~$1.4M |
| August 20, 2025 | Jones Teresa A. | Executive Vice President | S | -600 | 992.05 | ~$0.6M |
| July 14, 2025 | Rubanenko Yoram | Executive Vice President | S | -4000 | 974.963 | ~$3.9M |
| June 18, 2025 | DECKER SUSAN L | — | 2 reported sale rows | 547 | — | ~$0.5M |
| June 18, 2025 | DECKER SUSAN L | — | S | -546 | 980 | ~$0.5M |
| June 18, 2025 | DECKER SUSAN L | — | S | -1 | 978.395 | ~$1K |
| June 9, 2025 | Callans Patrick J | Executive Vice President | S | -3000 | 1002.766 | ~$3.0M |
| June 6, 2025 | Riel Pierre | Executive Vice President | S | -2000 | 1014.147 | ~$2.0M |
| April 17, 2025 | Klauer James C | Executive Vice President | S | -4000 | 981.07 | ~$3.9M |
| March 27, 2025 | MILLERCHIP GARY | Executive Vice President | S | -1100 | 940.006 | ~$1.0M |
| March 24, 2025 | Adamo Claudine | Executive Vice President | S | -900 | 922.56 | ~$0.8M |
| March 18, 2025 | Frates Caton | Executive Vice President | S | -850 | 900.2501 | ~$0.8M |
| March 11, 2025 | Vachris Roland Michael | President and CEO | S | -3600 | 931 | ~$3.4M |
| October 24, 2024 | GALANTI RICHARD A | Executive Vice President | S | -1416.461 | 894.6802 | ~$1.3M |
| October 23, 2024 | Jones Teresa A. | Executive Vice President | S | -800 | 896.545 | ~$0.7M |
| October 15, 2024 | Riel Pierre | Executive Vice President | S | -2000 | 896.713 | ~$1.8M |
| October 11, 2024 | Miller Russell D | Sr. Executive Vice President | S | -4400 | 891.152 | ~$3.9M |
| September 30, 2024 | Callans Patrick J | Executive Vice President | S | -2500 | 893.94 | ~$2.2M |
| September 30, 2024 | Frates Caton | Executive Vice President | S | -1700 | 883.35 | ~$1.5M |
| September 30, 2024 | Adamo Claudine | Executive Vice President | S | -3200 | 888.993 | ~$2.8M |