COST SEC Form 4 filings
Costco Wholesale Corp /New Latest Insider Trading Activity
Over the past 279 days, 10 insider trades from Costco Wholesale Corp /New (COST). The most recent SEC Form 4 filing shows a sale by Wilcox William Richard (Costco Wholesale Corp /New Executive Vice President) on October 13, 2026 involving 1,100 shares at $958.20 per share. This page shows up to the 10 most recent SEC Form 4 filing records on a 6-hour delay. Sign up for real-time updates and access to 20 years of historic insider trading data.
Insider Trading For COST Charted on Daily Candles. Scroll left or zoom out to load earlier candles (up to 2 years).
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| Ticker | Filing Date | Transaction Date | Company | Insider | Title | Transaction | Trade Count | Shares | Avg. Price | Total Value | Position Size Change | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-10-14 | 2026-10-13 | Costco Wholesale Corp /New | Wilcox William Richard | Executive Vice President | Sell | 1 | 1,100 | $958.21 | $1,054,025.50 | 26.23% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-09-30 | 2026-09-29 | Costco Wholesale Corp /New | Frates Caton | Sr. Executive Vice President | Sell | 1 | 800.64 | $915.93 | $733,328.36 | 9.19% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-09-30 | 2026-09-29 | Costco Wholesale Corp /New | Adamo Claudine | Executive Vice President | Sell | 1 | 2,200 | $915.93 | $2,015,046.00 | 23.57% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-06-25 | 2026-06-23 | Costco Wholesale Corp /New | Denman Kenneth D | Director | Sell | 1 | 885 | $957.45 | $847,343.25 | 15.63% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-04-01 | 2026-04-01 | Costco Wholesale Corp /New | Frates Caton | Executive Vice President | Sell | 1 | 700 | $993.00 | $695,100.00 | 10.74% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-03-11 | 2026-03-09 | Costco Wholesale Corp /New | Adamo Claudine | Executive Vice President | Sell | 1 | 730 | $1,003.02 | $732,204.60 | 10.66% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-01-23 | 2026-01-21 | Costco Wholesale Corp /New | Jones Teresa A. | Executive Vice President | Sell | 1 | 850 | $986.26 | $838,321.00 | 16.74% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-01-20 | 2026-01-16 | Costco Wholesale Corp /New | Decker Susan L | Director | Sell | 1 | 458 | $955.00 | $437,390.00 | 5.09% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-01-15 | 2026-01-14 | Costco Wholesale Corp /New | Klauer James C | Executive Vice President | Sell | 1 | 1,500 | $939.00 | $1,408,500.00 | 3.24% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. COST | 2026-01-12 | 2026-01-09 | Costco Wholesale Corp /New | Miller Russell D | Sr. Executive Vice President | Sell | 1 | 1,500 | $916.32 | $1,374,480.00 | 15.40% | View Filing |
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