Greedy Insider
COST Insider Trades and Greediness Scores
COSTCO WHOLESALE CORP /NEW (COST) insider trades: since Dec 29, 2025, Greedy Insider recorded 0 open-market buys and 21 sales on Form 4 from 13 insiders. The strongest recent filing scored 86 (Strong).
Who bought and who sold
Across the last 21 scoreable Form 4 transactions in COST, 0 were open-market purchases and 21 were sales. The table lists the most recent filings with each one's Greediness Score, so the structurally unusual trades are easy to spot first.
| Insider | Role | Type | Shares | Date | Score | ||
|---|---|---|---|---|---|---|---|
| Wilcox William Richard | President | Sell | 1100.0 | 1054025.5 | 2026-10-13 | 70 | View |
| Frates Caton | President | Sell | 800.0 | 732744.0 | 2026-09-29 | 70 | View |
| Adamo Claudine | President | Sell | 2200.0 | 2015046.0 | 2026-09-29 | 76 | View |
| Frates Caton | President | Sell | 1654.0 | 1492536.5 | 2026-09-10 | 86 | View |
| Adamo Claudine | President | Sell | 916.0 | 826580.06 | 2026-09-10 | 80 | View |
| Wilcox William Richard | President | Sell | 1934.0 | 1745202.9 | 2026-09-10 | 85 | View |
| Rubanenko Yoram | President | Sell | 1695.0 | 1529534.1 | 2026-09-10 | 83 | View |
| Riel Pierre | President | Sell | 1561.0 | 1408615.1 | 2026-09-10 | 83 | View |
| Klauer James C | President | Sell | 936.0 | 844627.7 | 2026-09-10 | 81 | View |
| Jones Teresa A. | President | Sell | 1458.0 | 1315670.0 | 2026-09-10 | 84 | View |
The strongest recent filing
Frates Caton (President) sold 1,654 shares of COSTCO WHOLESALE CORP /NEW on Sep 10, 2026, a filing that scored 86 (Strong). It scored Strong because a senior insider was trading and several insiders moved the same way within a week. The score describes the filing, not future returns. This is not investment advice.
Cluster activity
A cluster buy is present: 7 insiders (Frates Caton, Adamo Claudine, Wilcox William Richard, Rubanenko Yoram) traded COST the same direction within a 7-day window. Shared conviction is a stronger structural signal than a lone trade.
How this compares with COSTCO WHOLESALE CORP /NEW's own history
Open-market buys make up 0% of the 21 scoreable COST transactions on record between Dec 29, 2025 and Oct 13, 2026. Comparing a filing with the company's own buy/sell mix is how you tell a routine disposal from an unusual accumulation.
Methodology and sources
Scores come from six published, user-adjustable factors (insider role, cluster activity, trade size versus the insider's own history, position impact, filing urgency, and direct versus indirect ownership). The score describes the filing, not future returns. This is not investment advice.
Key facts
- Scoreable Form 4 transactions on record: 21
- Open-market buys: 0
- Sales: 21
- Distinct insiders: 13
- Strongest recent Greediness Score: 86 (Strong)
Primary sources
Related
- Strongest filing
- COST in the live feed
- How the Greediness Score works
- What is a cluster buy?
- Form 4 transaction codes
The score describes the filing, not future returns. This is not investment advice.