# Costco Wholesale Corp /New (COST) insider trading, Q3 2026

Canonical: https://sec-api.dev/insider-trading/cost

> 17 non-derivative transactions: 0 purchases, 2 sales ($2.7M). CIK 909832.

| Date | Insider | Relationship | Code | Shares | Price | Owned after | Filing |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2026-09-29 | Adamo Claudine | Officer | S | 2200.0 | 915.93 | 7133.51 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000088/0000909832-26-000088-index.htm |
| 2026-09-29 | Frates Caton | Officer | S | 800.64 | 915.93 | 7912.0 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000090/0000909832-26-000090-index.htm |
| 2026-09-10 | Adamo Claudine | Officer | A | 4129.0 | 0.0 | 10250.2 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000068/0000909832-26-000068-index.htm |
| 2026-09-10 | Adamo Claudine | Officer | F | 916.69 | 902.38 | 9333.51 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000068/0000909832-26-000068-index.htm |
| 2026-09-10 | Frates Caton | Officer | A | 4552.0 | 0.0 | 10367.0 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000070/0000909832-26-000070-index.htm |
| 2026-09-10 | Frates Caton | Officer | F | 1654.36 | 902.38 | 8712.64 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000070/0000909832-26-000070-index.htm |
| 2026-09-10 | Jones Teresa A. | Officer | F | 1458.54 | 902.38 | 6598.27 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000072/0000909832-26-000072-index.htm |
| 2026-09-10 | Jones Teresa A. | Officer | A | 4129.0 | 0.0 | 8056.8 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000072/0000909832-26-000072-index.htm |
| 2026-09-10 | Klauer James C | Officer | A | 4129.0 | 0.0 | 48965.99 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000074/0000909832-26-000074-index.htm |
| 2026-09-10 | Klauer James C | Officer | F | 936.12 | 902.38 | 48029.88 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000074/0000909832-26-000074-index.htm |
| 2026-09-10 | Riel Pierre | Officer | F | 1561.66 | 902.38 | 14246.23 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000076/0000909832-26-000076-index.htm |
| 2026-09-10 | Riel Pierre | Officer | A | 4552.0 | 0.0 | 15807.89 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000076/0000909832-26-000076-index.htm |
| 2026-09-10 | Rubanenko Yoram | Officer | F | 1695.95 | 902.38 | 10680.17 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000078/0000909832-26-000078-index.htm |
| 2026-09-10 | Rubanenko Yoram | Officer | A | 4129.0 | 0.0 | 12376.12 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000078/0000909832-26-000078-index.htm |
| 2026-09-10 | Wilcox William Richard | Officer | A | 4129.0 | 0.0 | 6129.0 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000080/0000909832-26-000080-index.htm |
| 2026-09-10 | Wilcox William Richard | Officer | F | 1934.61 | 902.38 | 4194.39 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000080/0000909832-26-000080-index.htm |
| 2026-07-10 | RAIKES JEFFREY S | Director | G | 5249.0 | 0.0 | 6043.94 | https://www.sec.gov/Archives/edgar/data/909832/000090983226000062/0000909832-26-000062-index.htm |

Source: https://www.sec.gov/data-research/sec-markets-data/insider-transactions-data-sets

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