NASDAQ:COST

Costco Stock Insider Trading

Consumer Defensive > Discount Stores

Buy COST

*Your capital is at risk

$961.83

+7.56 (+0.792%)

At Close: Jun 03, 2026

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 (Last 100 transactions)	-60.14
● Buy	74.05K shares
● Sell	703.11M shares
30% Buy Activity Negligible or No Correlation
Buy Signal Low Confidence Oct 22, 2025 Analysis Breakdown: Signal is highly questionable due to a strongly contradictory negative Insider Power Score of -60.14. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Oct 22, 2025 Buy	Common Stock A-Award	Raikes Jeffrey S Director	Director	286 Value: $270.2K
Oct 22, 2025 Buy	Common Stock A-Award	Wilderotter Mary Agnes Director	Director	286 Value: $270.2K
Oct 22, 2025 Sell	Common Stock F-InKind	Adamo Claudine Executive Vice President	CEO / President	111 Value: $104.5K
Oct 22, 2025 Sell	Common Stock F-InKind	Adamo Claudine Executive Vice President	CEO / President	199 Value: $187.7K
Oct 22, 2025 Sell	Common Stock F-InKind	Adamo Claudine Executive Vice President	CEO / President	122 Value: $115.0K
Oct 22, 2025 Sell	Common Stock F-InKind	Callans Patrick J Executive Vice President	CEO / President	111 Value: $104.5K
Oct 22, 2025 Sell	Common Stock F-InKind	Callans Patrick J Executive Vice President	CEO / President	191 Value: $180.5K
Oct 22, 2025 Sell	Common Stock F-InKind	Frates Caton Executive Vice President	CEO / President	706 Value: $666.7K
Oct 22, 2025 Sell	Common Stock F-InKind	Frates Caton Executive Vice President	CEO / President	758 Value: $716.3K
Oct 22, 2025 Sell	Common Stock F-InKind	Frates Caton Executive Vice President	CEO / President	156 Value: $147.1K
Oct 22, 2025 Sell	Common Stock F-InKind	Klauer James C Executive Vice President	CEO / President	111 Value: $104.8K
Oct 22, 2025 Sell	Common Stock F-InKind	Klauer James C Executive Vice President	CEO / President	191 Value: $180.1K
Oct 22, 2025 Buy	Common Stock A-Award	Millerchip Gary Executive Vice President	CEO / President	6 268 Value: $5.92M
Oct 22, 2025 Sell	Common Stock F-InKind	Polit Javier Executive Vice President	CEO / President	337 Value: $318.0K
Oct 22, 2025 Sell	Common Stock F-InKind	Adamo Claudine Executive Vice President	CEO / President	97 Value: $91.6K
Oct 22, 2025 Sell	Common Stock F-InKind	Adamo Claudine Executive Vice President	CEO / President	177 Value: $166.9K
Oct 22, 2025 Buy	Common Stock A-Award	Stanton John W Director	Director	286 Value: $270.2K
Oct 22, 2025 Buy	Common Stock A-Award	Jewell Sarah Mr Sally Director	Director	286 Value: $270.2K
Oct 22, 2025 Buy	Common Stock A-Award	Foulkes Helena Director	Director	286 Value: $270.2K
Oct 22, 2025 Buy	Common Stock A-Award	Denman Kenneth D Director	Director	286 Value: $270.2K
Oct 22, 2025 Sell	Common Stock F-InKind	Polit Javier Executive Vice President	CEO / President	294 Value: $277.6K
Oct 22, 2025 Sell	Common Stock F-InKind	Polit Javier Executive Vice President	CEO / President	538 Value: $508.0K
Oct 22, 2025 Sell	Common Stock F-InKind	Sullivan John Christopher Executive Vp	Officer	366 Value: $345.7K
Oct 22, 2025 Sell	Common Stock F-InKind	Sullivan John Christopher Executive Vp	Officer	569 Value: $537.4K
Oct 22, 2025 Sell	Common Stock F-InKind	Sullivan John Christopher Executive Vp	Officer	421 Value: $397.7K

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

ABOUT COSTCO WHOLESALE CORPORATION

Costco Wholesale Corporation, together with its subsidiaries, engages in the operation of membership warehouses in the United States, Puerto Rico, Canada, the United Kingdom, Mexico, Japan, Korea, Australia, Spain, France, Iceland, China, and Taiwan. It offers branded and private-label products in a range of merchandise categories. The company offers sundries, dry groceries, candies, coolers, freezers, liquor, and tobacco and deli products; appli...

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