COST
Costco Wholesale Corporation
Costco Wholesale Corporation insider trading
Costco Wholesale Corporation files with the SEC as a Retail-Variety Stores company headquartered in Issaquah, WA. Every time one of its executives or directors buys or sells the stock, the filing appears here the moment it reaches the SEC — with grants and option exercises set apart from the trades that cost the insider their own money.
From SEC filings
Recent COST insider transactions
3 insiders traded COST on the open market between Mar 09, 2026 and Jun 23, 2026 — 3 sales worth $2.3M.
- Bought
- —
- Sold
- $2.3M
- Net
- −$2.3M
- Insiders
- 3
none on a 10b5-1 plan
Denman Kenneth D
Director
−$847.3K
Jun 23, 2026
885 sh · $957.45
Frates Caton
Executive Vice President
−$695.1K
Apr 01, 2026
700 sh · $993.00
Adamo Claudine
Executive Vice President
−$732.2K
Mar 09, 2026
730 sh · $1,003.02
| Date | Insider | Shares | Price | Value |
|---|---|---|---|---|
| Jun 23, 2026 | Denman Kenneth DDirector | 885 | $957.45 | −$847.3K |
| Apr 01, 2026 | Frates CatonExecutive Vice President | 700 | $993.00 | −$695.1K |
| Mar 09, 2026 | Adamo ClaudineExecutive Vice President | 730 | $1,003.02 | −$732.2K |
SEC Form 4 data, Q3 2024 to Q2 2026
COST insider trading by quarter
Between Jul 01, 2024 and Jun 30, 2026, 17 insiders traded COST on the open market: 0 purchases and 39 sales worth $57.5M. In the last four quarters alone: 0 purchases and 16 sales ($23.5M), by 11 insiders.
| Quarter | Bought | Sold | Insiders |
|---|---|---|---|
| Q2 2026 | — | −$1.5M2 sales | |
| Q1 2026 | — | −$4.8M5 sales | |
| Q4 2025 | — | −$8.2M5 sales | |
| Q3 2025 | — | −$9M4 sales | |
| Q2 2025 | — | −$9.5M5 sales | |
| Q1 2025 | — | −$6M4 sales | |
| Q4 2024 | — | −$7.7M4 sales | |
| Q3 2024 | — | −$10.8M10 sales |
- Largest sale
- −$3.9M of COST by Klauer James C (Executive Vice President) on Apr 17, 2025.
Open-market transactions through Jun 30, 2026most recent first
Denman Kenneth D
Director
−$847.3K
Jun 23, 2026
885 sh · $957.45
Jones Teresa A.
Executive Vice President
−$838.3K
Jan 21, 2026
850 sh · $986.26
Decker Susan L
Director
−$437.4K
Jan 16, 2026
458 sh · $955.00
Klauer James C
Executive Vice President
−$1.4M
Jan 14, 2026
1,500 sh · $939.00
Miller Russell D
Sr. Executive Vice President
−$1.4M
Jan 09, 2026
1,500 sh · $916.32
Polit Javier
Executive Vice President
−$481.8K
Dec 30, 2025
558 sh · $862.90
Polit Javier
Executive Vice President
−$1.8M
Dec 29, 2025
2,049 sh · $867.21
Wilcox William Richard
Executive Vice President
−$2.2M
Nov 07, 2025
2,400 sh · $930.13
Adamo Claudine
Executive Vice President
−$2.5M
Oct 24, 2025
2,700 sh · $935.68
Barbre Tiffany Marie
Principal Accounting Officer
−$1.2M
Oct 24, 2025
1,239 sh · $934.62
Miller Russell D
Sr. Executive Vice President
−$3.1M
Sep 29, 2025
3,381 sh · $915.00
Frates Caton
Executive Vice President
−$1.4M
Sep 29, 2025
1,540 sh · $910.02
Jones Teresa A.
Executive Vice President
−$595.2K
Aug 20, 2025
600 sh · $992.05
Rubanenko Yoram
Executive Vice President
−$3.9M
Jul 14, 2025
4,000 sh · $974.96
Decker Susan L
Director
−$535.1K
Jun 18, 2025
546 sh · $980.00
| Date | Insider | Shares | Price | Value |
|---|---|---|---|---|
| Jun 23, 2026 | Denman Kenneth DDirector | 885 | $957.45 | −$847.3K |
| Jan 21, 2026 | Jones Teresa A.Executive Vice President | 850 | $986.26 | −$838.3K |
| Jan 16, 2026 | Decker Susan LDirector | 458 | $955.00 | −$437.4K |
| Jan 14, 2026 | Klauer James CExecutive Vice President | 1,500 | $939.00 | −$1.4M |
| Jan 09, 2026 | Miller Russell DSr. Executive Vice President | 1,500 | $916.32 | −$1.4M |
| Dec 30, 2025 | Polit JavierExecutive Vice President | 558 | $862.90 | −$481.8K |
| Dec 29, 2025 | Polit JavierExecutive Vice President | 2,049 | $867.21 | −$1.8M |
| Nov 07, 2025 | Wilcox William RichardExecutive Vice President | 2,400 | $930.13 | −$2.2M |
| Oct 24, 2025 | Adamo ClaudineExecutive Vice President | 2,700 | $935.68 | −$2.5M |
| Oct 24, 2025 | Barbre Tiffany MariePrincipal Accounting Officer | 1,239 | $934.62 | −$1.2M |
| Sep 29, 2025 | Miller Russell DSr. Executive Vice President | 3,381 | $915.00 | −$3.1M |
| Sep 29, 2025 | Frates CatonExecutive Vice President | 1,540 | $910.02 | −$1.4M |
| Aug 20, 2025 | Jones Teresa A.Executive Vice President | 600 | $992.05 | −$595.2K |
| Jul 14, 2025 | Rubanenko YoramExecutive Vice President | 4,000 | $974.96 | −$3.9M |
| Jun 18, 2025 | Decker Susan LDirector | 546 | $980.00 | −$535.1K |
From SEC's quarterly Form 3, 4 and 5 data sets: code P purchases and code S sales of common stock, by the date the trade happened. Where a fund and the people who control it each report the same block, it is counted once. Trades made in the last days of Q2 2026 but filed after it closed arrive with SEC's next quarterly release.
Costco Wholesale Corporation company record
- SEC industry classification
- Retail-Variety Stores
- Headquarters
- Issaquah, WA
- Incorporated in
- WA
- Listed on
- Nasdaq
- SEC Central Index Key
- 0000909832
- Previously filed as
- COSTCO COMPANIES INC
Sourced from this company's own SEC submissions record. The industry label is SEC's Standard Industrial Classification, which is more specific than the Consumer Staples sector shown above.
After insiders bought COST
What the stock actually did in the 90 days following each open-market purchase
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How to read COST insider activity
- Open-market purchase (code P)
- An insider spending their own money at market price. This is the only buy code that reliably carries signal — it is a decision, not compensation.
- Grants and option exercises (codes A, M)
- Scheduled compensation. Most "insider buying" headlines are really this, which is why InsiderPulse weights it at a fraction of a real purchase.
- Cluster buy
- Two or more different insiders buying on the open market in the same window. One executive buying can mean anything; three is much harder to explain away.
Other Consumer Staples tickers
Questions
- Are COST insiders buying or selling?
- Between Mar 09, 2026 and Jun 23, 2026, 3 Costco Wholesale Corporation insiders made no open-market purchases and 3 sales worth $2.3M, a net sale of $2.3M.
- How much COST stock have insiders bought and sold in the last two years?
- Between Jul 01, 2024 and Jun 30, 2026, 17 Costco Wholesale Corporation insiders made no open-market purchases and 39 sales worth $57.5M. In the four quarters to Jun 30, 2026: no purchases and 16 sales ($23.5M). The largest sale was Klauer James C selling $3.9M on Apr 17, 2025.
- What was the largest recent COST insider trade?
- Denman Kenneth D (Director) sold $847.3K of COST stock on Jun 23, 2026 at about $957.45 a share.
- When did an insider last buy COST shares?
- No open-market purchase by a Costco Wholesale Corporation insider appears in the filings from Mar 09, 2026 to Jun 23, 2026 — every recorded open-market transaction in that period was a sale.
- Where does COST insider trading data come from?
- From the Form 4 filings Costco Wholesale Corporation's officers, directors and 10% owners must send the SEC within two business days of a trade. Each row on this page links to its original filing on SEC EDGAR. Share grants and option exercises are kept apart from open-market purchases and sales, because only the latter cost the insider their own money.
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