Costco Wholesale Corporation — SEC Form 4 Filings
SEC Form 4 Data
Track insider buying and selling activity for Costco Wholesale Corporation (COST). Data sourced from SEC EDGAR Form 4 filings and analyzed by StoxPulse AI for significance.
2
$0.00 total
18
$14.9M total
0.1x
Bearish Signal
20
Form 4 transactions
Buy − Sell value
Sale · Oct 24, 2025
Frates · Sale
Costco Wholesale Corporation insiders filed 20 Form 4 transactions in the period analyzed: 2 purchases totaling $0.00 and 18 sales totaling $14.9M. That puts the buy-to-sell ratio at 0.11, which we read as bearish on a directional basis.
The most active filer was Barbre Tiffany Marie with 3 transactions in this window. 4 of the 20 filings are flagged as routine — typically 10b5-1 scheduled trades rather than discretionary signals.
Form 4 filings are point-in-time disclosures and do not constitute investment advice. Routine sales under pre-arranged 10b5-1 plans should not be read as bearish.
| Insider | Title | Type | Shares | Price | Value | Date |
|---|---|---|---|---|---|---|
| Frates Caton | Executive Vice President | Sale | 700 | $993.00 | $695K | 2026-04-01 |
| MILLERCHIP GARY | Executive Vice President | Sale | 1,154.017 | $992.23 | $1.1M | 2026-03-11 |
| Adamo Claudine | Executive Vice President | Sale | 730 | $1003.02 | $732K | 2026-03-09 |
| RAIKES JEFFREY S | Director | Sale | 5,115 | $0.00 | $0.00 | 2026-01-27 |
| Jones Teresa A. | Executive Vice President | Sale | 300 | $0.00 | $0.00 | 2026-01-27 |
| Jones Teresa A. | Executive Vice President | Sale | 850 | $986.26 | $838K | 2026-01-21 |
| DECKER SUSAN L | Director | Sale | 458 | $955.00 | $437K | 2026-01-16 |
| Raimondo Gina Marie | Director | Buy | 215 | $0.00 | $0.00 | 2026-01-16 |
| Klauer James C | Executive Vice President | Sale | 1,500 | $939.00 | $1.4M | 2026-01-14 |
| Miller Russell D | Sr. Executive Vice President | Sale | 1,500 | $916.32 | $1.4M | 2026-01-09 |
| POLIT JAVIER | Executive Vice President | Sale | 558.305 | $862.89 | $482K | 2025-12-30 |
| POLIT JAVIER | Executive Vice President | Sale | 2,049 | $867.21 | $1.8M | 2025-12-29 |
| DENMAN KENNETH D | Director | Sale | 325 | $0.00 | $0.00 | 2025-12-19 |
| DECKER SUSAN L | Director | Sale | 2,827 | $0.00 | $0.00 | 2025-12-15 |
| RAIKES JEFFREY S | Director | Sale | 4,120 | $0.00 | $0.00 | 2025-11-10 |
| Wilcox William Richard | Executive Vice President | Sale | 2,400 | $930.13 | $2.2M | 2025-11-07 |
| Barbre Tiffany Marie | Principal Accounting Officer | Sale | 1,239.383 | $934.62 | $1.2M | 2025-10-24 |
| Adamo Claudine | Executive Vice President | Sale | 2,700 | $935.68 | $2.5M | 2025-10-24 |
| Barbre Tiffany Marie | Principal Accounting Officer | Buy | 2,118 | $0.00 | $0.00 | 2025-10-22 |
| Barbre Tiffany Marie | Principal Accounting Officer | Sale | 113.53 | $944.68 | $107K | 2025-10-22 |
Insider trading data for Costco Wholesale Corporation (COST) is sourced directly from SEC Form 4 filings on the EDGAR database. Corporate insiders — including directors, officers, and shareholders owning more than 10% of the company — are legally required to report their transactions within two business days.
Insider purchases are often considered a bullish signal because executives are using their own money to buy shares, suggesting they believe the stock is undervalued. Insider sales, on the other hand, are more nuanced — they can reflect routine diversification plans (known as 10b5-1 plans), tax obligations, or genuine concerns about the company's outlook.
StoxPulse's AI system analyzes each COST insider transaction to determine whether it appears routine or notable. We track the buy/sell ratio, total transaction values, and patterns over time to provide a clear picture of insider sentiment for Costco Wholesale Corporation.
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Disclaimer: Insider trading data for Costco Wholesale Corporation (COST) is sourced from SEC Form 4 filings and is provided for informational purposes only. Insider transactions should not be the sole basis for investment decisions. Always consult a qualified financial advisor.
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