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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 |
|---|---|---|---|---|
|
Sep 29, 2025 Sell |
Miller Russell D Sr. Executive Vice President |
3 381 Value: $3.09M |
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|
Sep 29, 2025 Sell |
Miller Russell D Sr. Executive Vice President |
3 381 Value: $3.09M |
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|
Sep 29, 2025 Sell |
Frates Caton Executive Vice President |
1 540 Value: $1.40M |
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|
Sep 29, 2025 Sell |
Frates Caton Executive Vice President |
1 540 Value: $1.40M |
||
|
Sep 23, 2025 Buy |
Miller Russell D Sr. Executive Vice President |
2 918 Value: $2.75M |
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|
Sep 23, 2025 Sell |
Miller Russell D Sr. Executive Vice President |
2 918 Value: $0 |
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|
Sep 23, 2025 Sell |
Miller Russell D Sr. Executive Vice President |
2 918 Value: $0 |
||
|
Sep 23, 2025 Buy |
Miller Russell D Sr. Executive Vice President |
2 918 Value: $2.75M |
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|
Sep 10, 2025 Buy |
Rubanenko Yoram Executive Vice President |
4 219 Value: $4.03M |
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|
Sep 10, 2025 Sell |
Rubanenko Yoram Executive Vice President |
1 746 Value: $1.67M |
||
|
Sep 10, 2025 Buy |
Riel Pierre Executive Vice President |
4 654 Value: $4.45M |
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|
Sep 10, 2025 Sell |
Riel Pierre Executive Vice President |
1 608 Value: $1.54M |
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|
Sep 10, 2025 Buy |
Miller Russell D Sr. Executive Vice President |
4 654 Value: $4.45M |
||
|
Sep 10, 2025 Sell |
Miller Russell D Sr. Executive Vice President |
1 735 Value: $1.66M |
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|
Sep 10, 2025 Buy |
Klauer James C Executive Vice President |
4 219 Value: $4.03M |
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|
Sep 10, 2025 Sell |
Klauer James C Executive Vice President |
958 Value: $916.4K |
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|
Sep 10, 2025 Buy |
Jones Teresa A. Executive Vice President |
4 219 Value: $4.03M |
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|
Sep 10, 2025 Sell |
Jones Teresa A. Executive Vice President |
1 503 Value: $1.44M |
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|
Sep 10, 2025 Buy |
Frates Caton Executive Vice President |
4 219 Value: $4.03M |
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|
Sep 10, 2025 Sell |
Frates Caton Executive Vice President |
1 271 Value: $1.22M |
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|
Sep 10, 2025 Buy |
Callans Patrick J Executive Vice President |
4 219 Value: $4.03M |
||
|
Sep 10, 2025 Sell |
Callans Patrick J Executive Vice President |
950 Value: $908.2K |
||
|
Sep 10, 2025 Buy |
Adamo Claudine Executive Vice President |
4 219 Value: $4.03M |
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|
Sep 10, 2025 Sell |
Adamo Claudine Executive Vice President |
950 Value: $908.2K |
||
|
Sep 10, 2025 Sell |
Rubanenko Yoram Executive Vice President |
1 746 Value: $1.67M |
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
