COSTCO WHOLESALE CORP /NEW Insider Trading Activity
Every SEC Form 4 insider transaction reported for COSTCO WHOLESALE CORP /NEW (COST), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are COST insiders buying or selling?
In the last 12 months, COSTCO WHOLESALE CORP /NEW insiders reported 0 open-market purchases ($0) and 14 sales ($18.3M) — net selling of $18.3M. Since January 2018, Trabud has recorded 178 Form 4 filings for COST: 3 buys ($1.6M) and 175 sells ($230.4M).
Source: SEC EDGAR Form 4
What stands out
- No COSTCO WHOLESALE CORP /NEW insider made an open-market purchase in the last 12 months; the 14 reported open-market sales totaled $18.3M.
Key Statistics (January 2018 – Oct 14, 2026)
Total Form 4 filings
178
SEC EDGAR
Insider filers
27
Insider buys (3)
$1.6M
Insider sells (175)
$230.4M
Insider sentiment
Net sellingNet insider flow of $228.8M in net selling since January 2018, and $18.3M in net selling over the last 12 months.
Recent COST insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Oct 14, 2026 | William Richard Wilcox | Executive Vice President | Sale | 1.1K | $958.21 | $1.1M | SEC ↗ |
| Sep 30, 2026 | Caton Frates | Sr. Executive Vice President | Sale | 800.64 | $915.93 | $733.3K | SEC ↗ |
| Sep 30, 2026 | Claudine Adamo | Executive Vice President | Sale | 2.2K | $915.93 | $2.0M | SEC ↗ |
| Jun 25, 2026 | Kenneth D Denman | Director | Sale | 885 | $957.45 | $847.3K | SEC ↗ |
| Apr 1, 2026 | Caton Frates | Executive Vice President | Sale | 700 | $993.00 | $695.1K | SEC ↗ |
| Mar 11, 2026 | Claudine Adamo | Executive Vice President | Sale | 730 | $1003.02 | $732.2K | SEC ↗ |
| Jan 23, 2026 | Teresa A. Jones | Executive Vice President | Sale | 850 | $986.26 | $838.3K | SEC ↗ |
| Jan 20, 2026 | Susan L Decker | Director | Sale | 458 | $955.00 | $437.4K | SEC ↗ |
| Jan 15, 2026 | James C Klauer | Executive Vice President | Sale | 1.5K | $939.00 | $1.4M | SEC ↗ |
| Jan 12, 2026 | Russell D Miller | Sr. Executive Vice President | Sale | 1.5K | $916.32 | $1.4M | SEC ↗ |
| Dec 31, 2025 | Javier Polit | Executive Vice President | Sale | 2.6K | $866.28 | $2.3M | SEC ↗ |
| Nov 12, 2025 | William Richard Wilcox | Executive Vice President | Sale | 2.4K | $930.13 | $2.2M | SEC ↗ |
| Oct 24, 2025 | Tiffany Marie Barbre | Other | Sale | 1.2K | $934.62 | $1.2M | SEC ↗ |
| Oct 24, 2025 | Claudine Adamo | Executive Vice President | Sale | 2.7K | $935.68 | $2.5M | SEC ↗ |
| Oct 1, 2025 | Russell D Miller | Sr. Executive Vice President | Sale | 3.4K | $915.00 | $3.1M | SEC ↗ |
| Sep 30, 2025 | Caton Frates | Executive Vice President | Sale | 1.5K | $910.02 | $1.4M | SEC ↗ |
| Aug 22, 2025 | Teresa A. Jones | Executive Vice President | Sale | 600 | $992.05 | $595.2K | SEC ↗ |
| Jul 15, 2025 | Yoram Rubanenko | Executive Vice President | Sale | 4.0K | $974.96 | $3.9M | SEC ↗ |
| Jun 20, 2025 | Susan L Decker | Director | Sale | 547 | $980.00 | $536.1K | SEC ↗ |
| Jun 10, 2025 | Patrick J Callans | Executive Vice President | Sale | 3.0K | $1002.77 | $3.0M | SEC ↗ |
| Jun 9, 2025 | Pierre Riel | Executive Vice President | Sale | 2.0K | $1014.15 | $2.0M | SEC ↗ |
| Apr 21, 2025 | James C Klauer | Executive Vice President | Sale | 4.0K | $981.07 | $3.9M | SEC ↗ |
| Mar 27, 2025 | Gary Millerchip | Executive Vice President | Sale | 1.1K | $940.01 | $1.0M | SEC ↗ |
| Mar 25, 2025 | Claudine Adamo | Executive Vice President | Sale | 900 | $922.56 | $830.3K | SEC ↗ |
| Mar 20, 2025 | Caton Frates | Executive Vice President | Sale | 850 | $900.25 | $765.2K | SEC ↗ |
Showing the 25 most recent of 178 Form 4 filings for COSTCO WHOLESALE CORP /NEW.
Most active COST insiders
- Susan L Decker29 filings
- Richard A Galanti22 filings
- John W Meisenbach11 filings
- Russell D Miller11 filings
- Patrick J Callans10 filings
Ask anything about COST insider activity
Use Trabud's AI agent to query COSTCO WHOLESALE CORP /NEW's Form 4 history in plain English — "Show me COST CEO purchases this year" or compare it against any other ticker.
Open the AI agentCOST insider trading FAQ
Are COSTCO WHOLESALE CORP /NEW insiders buying or selling?
In the last 12 months, COSTCO WHOLESALE CORP /NEW insiders reported 0 open-market purchases ($0) and 14 sales ($18.3M) — net selling of $18.3M. Since January 2018, Trabud has recorded 178 Form 4 filings for COST: 3 buys ($1.6M) and 175 sells ($230.4M). Over the full record that is net selling of $228.8M.
How many insiders trade COST stock?
27 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for COSTCO WHOLESALE CORP /NEW. The most recent filing was accepted on Oct 14, 2026.
Where does Trabud get COST insider trading data?
All COST insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.