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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 |
|---|---|---|---|---|
|
Oct 22, 2025 Sell |
Vachris Roland Michael President And CEO |
1 160 Value: $1.10M |
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|
Oct 22, 2025 Buy |
Vachris Roland Michael President And CEO |
13 834 Value: $13.1M |
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|
Oct 22, 2025 Sell |
Barbre Tiffany Marie Principal Accounting Officer |
85 Value: $79.9K |
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|
Oct 22, 2025 Sell |
Barbre Tiffany Marie Principal Accounting Officer |
119 Value: $112.0K |
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|
Oct 22, 2025 Sell |
Barbre Tiffany Marie Principal Accounting Officer |
114 Value: $107.2K |
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|
Oct 22, 2025 Buy |
Barbre Tiffany Marie Principal Accounting Officer |
2 118 Value: $2.00M |
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|
Oct 22, 2025 Sell |
Barbre Tiffany Marie Principal Accounting Officer |
90 Value: $85.2K |
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|
Oct 22, 2025 Sell |
Barbre Tiffany Marie Principal Accounting Officer |
135 Value: $127.9K |
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|
Oct 22, 2025 Sell |
Vachris Roland Michael President And CEO |
1 493 Value: $1.41M |
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|
Oct 22, 2025 Buy |
Sullivan John Christopher Executive Vp |
4 654 Value: $4.40M |
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|
Oct 22, 2025 Sell |
Sullivan John Christopher Executive Vp |
573 Value: $541.1K |
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|
Oct 22, 2025 Sell |
Sullivan John Christopher Executive Vp |
585 Value: $552.5K |
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|
Oct 22, 2025 Buy |
Polit Javier Executive Vice President |
4 219 Value: $3.99M |
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|
Oct 22, 2025 Sell |
Millerchip Gary Executive Vice President |
313 Value: $295.7K |
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|
Oct 22, 2025 Sell |
Millerchip Gary Executive Vice President |
500 Value: $472.6K |
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|
Oct 22, 2025 Sell |
Klauer James C Executive Vice President |
240 Value: $226.7K |
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Oct 22, 2025 Sell |
Klauer James C Executive Vice President |
199 Value: $187.7K |
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|
Oct 22, 2025 Sell |
Klauer James C Executive Vice President |
177 Value: $167.3K |
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|
Oct 22, 2025 Sell |
Frates Caton Executive Vice President |
248 Value: $234.0K |
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Oct 22, 2025 Sell |
Frates Caton Executive Vice President |
901 Value: $851.4K |
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|
Oct 22, 2025 Sell |
Callans Patrick J Executive Vice President |
240 Value: $226.7K |
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|
Oct 22, 2025 Sell |
Callans Patrick J Executive Vice President |
199 Value: $187.7K |
||
|
Oct 22, 2025 Sell |
Callans Patrick J Executive Vice President |
177 Value: $166.9K |
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|
Oct 06, 2025 Buy |
Wilcox William Richard Executive Vice President |
0 Value: $0 |
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|
Oct 06, 2025 Buy |
Wilcox William Richard Executive Vice President |
0 Value: $0 |
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
