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Buy COST
Costco Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be negative at -60.14. In total, the insiders bought 74.05K and sold 703.11M COST shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.
Insider Power
|
-60.14 |
| ● Buy | 74.05K shares |
| ● Sell | 703.11M shares |
|
30% Buy Activity
Negligible or No Correlation
|
|
Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
Apr 01, 2026 Sell |
Frates Caton Executive Vice President |
700 Value: $695.1K |
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|
Mar 12, 2026 Sell |
George Sarah Catherine Executive Vice President |
642 Value: $636.5K |
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|
Mar 11, 2026 Sell |
Millerchip Gary Executive Vice President |
1 154 Value: $1.15M |
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|
Mar 09, 2026 Sell |
Adamo Claudine Executive Vice President |
730 Value: $732.2K |
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|
Mar 02, 2026 Buy |
George Sarah Catherine Executive Vice President |
0 Value: $0 |
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|
Mar 02, 2026 Buy |
George Sarah Catherine Executive Vice President |
0 Value: $0 |
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|
Mar 02, 2026 Buy |
George Sarah Catherine Executive Vice President |
0 Value: $0 |
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|
Jan 27, 2026 Sell |
Raikes Jeffrey S Director |
5 115 Value: $0 |
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|
Jan 27, 2026 Sell |
Jones Teresa A. Executive Vice President |
300 Value: $0 |
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|
Jan 21, 2026 Sell |
Jones Teresa A. Executive Vice President |
850 Value: $838.3K |
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Jan 16, 2026 Sell |
Decker Susan L Director |
458 Value: $437.4K |
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|
Jan 16, 2026 Buy |
Raimondo Gina Marie Director |
215 Value: $207.2K |
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|
Jan 15, 2026 Buy |
Raimondo Gina Marie Director |
0 Value: $0 |
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|
Jan 14, 2026 Sell |
Klauer James C Executive Vice President |
1 500 Value: $1.41M |
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|
Jan 09, 2026 Sell |
Miller Russell D Sr. Executive Vice President |
1 500 Value: $1.37M |
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|
Dec 30, 2025 Sell |
Polit Javier Executive Vice President |
558 Value: $481.8K |
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|
Dec 29, 2025 Sell |
Polit Javier Executive Vice President |
2 049 Value: $1.78M |
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Dec 19, 2025 Sell |
Denman Kenneth D Director |
325 Value: $0 |
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|
Dec 15, 2025 Sell |
Decker Susan L Director |
2 827 Value: $0 |
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|
Nov 10, 2025 Sell |
Raikes Jeffrey S Director |
4 120 Value: $0 |
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|
Nov 07, 2025 Sell |
Wilcox William Richard Executive Vice President |
2 400 Value: $2.23M |
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|
Oct 24, 2025 Sell |
Adamo Claudine Executive Vice President |
2 700 Value: $2.53M |
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|
Oct 24, 2025 Sell |
Barbre Tiffany Marie Principal Accounting Officer |
1 239 Value: $1.16M |
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|
Oct 22, 2025 Buy |
Decker Susan L Director |
286 Value: $270.2K |
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|
Oct 22, 2025 Buy |
James Hamilton E Director |
286 Value: $270.2K |
About Insider Power
Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.
It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.
While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.
* October 6th, 2025 - Tested on 5562 stocks
