Costco Wholesale Corporation (COST) Insider Trading
Over the last 3 months, COST insiders made 0 open-market buys and 2 sales, a net sale of -$1.4M (SEC Form 4). Over the last 6 months, 3514 institutions increased and 3326 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
2
Net (3m)
-$1.4M
Insider trades by month Buys Sells
Oct
Nov
Dec
Jan
Mar
Apr
Context3-month price -1%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Apr 1, 2026 | Frates Catonofficer: Executive Vice President | Sell | 700 | $993.00 |
| Mar 13, 2026 | MILLERCHIP GARYofficer: Executive Vice President | Tax | 1,154 | $992.23 |
| Mar 11, 2026 | Adamo Claudineofficer: Executive Vice President | Sell | 730 | $1003.02 |
| Jan 23, 2026 | Jones Teresa A.officer: Executive Vice President | Sell | 850 | $986.26 |
| Jan 20, 2026 | DECKER SUSAN Ldirector | Sell | 458 | $955.00 |
| Jan 20, 2026 | Raimondo Gina Mariedirector | Grant | 215 | — |
| Jan 15, 2026 | Klauer James Cofficer: Executive Vice President | Sell | 1,500 | $939.00 |
| Jan 12, 2026 | Miller Russell Dofficer: Sr. Executive Vice President | Sell | 1,500 | $916.32 |
| Dec 31, 2025 | POLIT JAVIERofficer: Executive Vice President | Sell | 558 | $862.89 |
| Dec 31, 2025 | POLIT JAVIERofficer: Executive Vice President | Sell | 2,049 | $867.21 |
| Nov 12, 2025 | Wilcox William Richardofficer: Executive Vice President | Sell | 2,400 | $930.13 |
| Oct 24, 2025 | Sullivan John Christopherofficer: Executive VP | Tax | 573 | $944.68 |
| Oct 24, 2025 | Adamo Claudineofficer: Executive Vice President | Sell | 2,700 | $935.68 |
| Oct 24, 2025 | Vachris Roland Michaeldirector, officer: President and CEO | Grant | 13,834 | — |
| Oct 24, 2025 | Frates Catonofficer: Executive Vice President | Tax | 706 | $944.68 |
| Oct 24, 2025 | STANTON JOHN Wdirector | Grant | 286 | — |
| Oct 24, 2025 | Frates Catonofficer: Executive Vice President | Tax | 248 | $944.68 |
| Oct 24, 2025 | Klauer James Cofficer: Executive Vice President | Tax | 240 | $944.68 |
| Oct 24, 2025 | Barbre Tiffany Marieother: Principal Accounting Officer | Tax | 85 | $944.68 |
| Oct 24, 2025 | Klauer James Cofficer: Executive Vice President | Tax | 191 | $944.68 |
| Oct 24, 2025 | Klauer James Cofficer: Executive Vice President | Tax | 177 | $944.68 |
| Oct 24, 2025 | POLIT JAVIERofficer: Executive Vice President | Tax | 294 | $944.68 |
| Oct 24, 2025 | Callans Patrick Jofficer: Executive Vice President | Tax | 240 | $944.68 |
| Oct 24, 2025 | Frates Catonofficer: Executive Vice President | Tax | 758 | $944.68 |
| Oct 24, 2025 | Vachris Roland Michaeldirector, officer: President and CEO | Tax | 1,160 | $944.68 |
| Oct 24, 2025 | Adamo Claudineofficer: Executive Vice President | Tax | 97 | $944.68 |
| Oct 24, 2025 | Sullivan John Christopherofficer: Executive VP | Tax | 421 | $944.68 |
| Oct 24, 2025 | Callans Patrick Jofficer: Executive Vice President | Tax | 177 | $944.68 |
| Oct 24, 2025 | Vachris Roland Michaeldirector, officer: President and CEO | Tax | 1,493 | $944.68 |
| Oct 24, 2025 | Frates Catonofficer: Executive Vice President | Tax | 901 | $944.68 |
Source: COST SEC Form 4 filings, latest Apr 1, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their COST positions over the last 6 months (SEC Form 13F).
Increased
3514
New positions
641
Reduced
3326
Sold out
287
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| VANGUARD GROUP INC | Increased | 43.6M | Jan 29, 2026 |
| BLACKROCK, INC. | Increased | 35.1M | Feb 12, 2026 |
| BLACKROCK, INC. | Reduced | 34.9M | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 28.8M | May 15, 2026 |
| STATE STREET CORP | Increased | 18.2M | May 15, 2026 |
| STATE STREET CORP | Reduced | 18.1M | Feb 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 10.7M | May 8, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 10.7M | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 10.4M | Feb 9, 2026 |
| MORGAN STANLEY | Increased | 9.9M | May 15, 2026 |
| MORGAN STANLEY | Increased | 9.5M | Feb 13, 2026 |
| BANK OF AMERICA CORP /DE/ | Increased | 7.5M | May 18, 2026 |
| BANK OF AMERICA CORP /DE/ | Reduced | 6.9M | Feb 3, 2026 |
| BANK OF AMERICA CORP /DE/ | Reduced | 6.7M | Feb 17, 2026 |
| DIAMANT ASSET MANAGEMENT, INC. | Increased | 6.7M | Apr 22, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.