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COST insider trading — Costco Wholesale Corp

Over the last 90 days, insiders at Costco Wholesale Corp (COST) made 0 open-market purchases worth $0 and 3 open-market sales worth $3.80M, making them net sellers by $3.80M. The largest sale was by Adamo Claudine (Executive Vice President), who sold 2,200 shares for $2.02M on Sep 29, 2026.

Updated Oct 16, 2026.

Insider buying · 90d
$0
Insider selling · 90d
$3.80M
Net · 90d
−$3.80M
Last 30 days
0B / 3S

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Recent COST insider transactions

Every Form 4 filed by Costco Wholesale Corp officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.

Trade dateInsiderRoleTypeOwnershipSharesPriceValueFiling
Oct 13, 2026Wilcox William RichardExecutive Vice PresidentS · SaleDirect1,100$958.21$1.05MForm 4
Sep 29, 2026Frates CatonSr. Executive Vice PresidentS · SaleDirect801$915.93$733KForm 4
Sep 29, 2026Adamo ClaudineExecutive Vice PresidentS · SaleDirect2,200$915.93$2.02MForm 4
Sep 10, 2026Wilcox William RichardExecutive Vice PresidentA · Grant/awardDirect4,129——Form 4
Sep 10, 2026Wilcox William RichardExecutive Vice PresidentF · Tax withholdingDirect1,935$902.38$1.75MForm 4
Sep 10, 2026Rubanenko YoramExecutive Vice PresidentA · Grant/awardDirect4,129——Form 4
Sep 10, 2026Rubanenko YoramExecutive Vice PresidentF · Tax withholdingDirect1,696$902.38$1.53MForm 4
Sep 10, 2026Riel PierreExecutive Vice PresidentA · Grant/awardDirect4,552——Form 4
Sep 10, 2026Riel PierreExecutive Vice PresidentF · Tax withholdingDirect1,562$902.38$1.41MForm 4
Sep 10, 2026Klauer James CExecutive Vice PresidentA · Grant/awardDirect4,129——Form 4
Sep 10, 2026Klauer James CExecutive Vice PresidentF · Tax withholdingDirect936$902.38$845KForm 4
Sep 10, 2026Jones Teresa A.Executive Vice PresidentA · Grant/awardDirect4,129——Form 4
Sep 10, 2026Jones Teresa A.Executive Vice PresidentF · Tax withholdingDirect1,459$902.38$1.32MForm 4
Sep 10, 2026Frates CatonExecutive Vice PresidentA · Grant/awardDirect4,552——Form 4
Sep 10, 2026Frates CatonExecutive Vice PresidentF · Tax withholdingDirect1,654$902.38$1.49MForm 4
Sep 10, 2026Adamo ClaudineExecutive Vice PresidentA · Grant/awardDirect4,129——Form 4
Sep 10, 2026Adamo ClaudineExecutive Vice PresidentF · Tax withholdingDirect917$902.38$827KForm 4

COST insider trading FAQ

Are insiders buying COST stock?

Not on the open market. In the last 90 days, Costco Wholesale Corp insiders made no open-market purchases, and 3 open-market sales totaling $3.80M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).

Who are the insiders trading COST?

Recent sellers: Adamo Claudine, Frates Caton, Wilcox William Richard.

Where does COST insider trading data come from?

Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.

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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.