COSTCO WHOLESALE CORP /NEW (COST) insider trading
No open-market insider purchases of COSTCO WHOLESALE CORP /NEW are on record; 3 open-market sales are.
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Insider purchases
No open-market purchases on record.
Insider sales
3 open-market sales on record
| Filed | Insider | Sold |
|---|---|---|
| Oct 14 Form 4 (opens sec.gov) |
William Richard WilcoxOfficer | $1.1M 1,100 at $958.21 · 26% of holdings |
| Sep 30 Form 4 (opens sec.gov) |
Caton FratesOfficer | $733k 801 at $915.93 · 9% of holdings |
| Sep 30 Form 4 (opens sec.gov) |
Claudine AdamoOfficer | $2.0M 2,200 at $915.93 · 24% of holdings |
Most insider sales are planned in advance or made for personal reasons, so a sale says less than a buy.
COST trades reported by members of Congress
| Reported | Member | Trade | Amount |
|---|---|---|---|
| Oct 27 |  Pete SessionsR-TX · House25 days after the trade | Sale | $250K–$500K |
| Oct 27 | Pete SessionsR-TX · House14 days after the trade | Sale | $100K–$250K |
| Oct 14 |  Rick AllenR-GA · House26 days after the trade | Sale | $1K–$15K |
| Aug 14 |  Richard McCormickR-GA · House15 days after the trade | Sale | $1K–$15K |
| Jul 21 |  Alan ArmstrongR-OK · Senate116 days after the trade | Buy | $1K–$15K |
Members of Congress report trades up to 45 days later, in dollar ranges. Every member's trades.
Planned insider sales of COST (Form 144)
| Filed | Insider | To sell |
|---|---|---|
| Oct 13 Form 144 | Wilcox William RichardOfficer · no trading plan named | $1.1M 1,100 shares from Oct 13 |
A Form 144 is filed before an insider sells restricted or control shares; the Form 4 reports the sale once made.
Questions
Are insiders buying COST stock?
Not recently: no open-market purchases were filed in the last 90 days.
Who bought COST stock most recently?
No insider has bought COST on the open market in the filings on record.
How does InsiderBeacon score an insider buy?
Out of 100, from who bought, how much their stake grew, the size of the trade, whether other insiders bought within ten days, where the price sat in its 52-week range, and whether it was a first or a routine buy. The score is fixed when the filing arrives. The formula and the research behind it.
Data as of Oct 14, 2026, from SEC EDGAR Form 4 filings: open-market purchases (code P) of $25,000 or more, and open-market sales. Every row links to its filing. Scores summarise what a filing says (how the score works); outcomes are hypothetical, from the first close after the filing, and past results don't predict future ones. Disclaimer