By CapitalSnitch Research Desk · updated Oct 11, 2026 · data from SEC filings and official Congress disclosures
Insider activity at Costco Wholesale Corp has been all selling for a year now: about $17.3 million from ten sellers, and zero buyers at market prices.
Keep in mind most insider selling is routine — stock-based pay has to be converted to cash at some point.
Zooming out by quarter: 7 quarters in a row of net selling by insiders. Insiders bought in 0 of the last 7 full quarters. Members of Congress reported 32 trades in COST over the past two years (15 members). Big money check: 4,231 institutions held COST as of Q2 2026, and funds were split between buying and selling.
Are insiders buying or selling COST stock?
In the last 12 months Costco Wholesale Corp insiders made open-market purchases worth about $0 and sales worth about $17.3 million. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
When was the last insider trade in COST?
The most recent open-market insider trade in COST was filed on 2026-09-30.
How many institutions own COST?
4,231 investment managers reported holding COST in SEC Form 13F filings for Q2 2026.
Has any member of Congress traded COST?
Yes. Members of Congress reported 32 trades in COST over the past two years. The full list is free on CapitalSnitch.
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Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1).
Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).