COST
COSTCO WHOLESALE CORP /NEW · Retail Trade · Market cap $442.4B
Insiders sold $3.8M net in the last 90 days ·3 sellers, 0 buyers· latest Form 4 filed Oct 14, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$18.3M
reported sales (SEC code S)
Unique Insiders
10
in the rolling window
Latest filing
Oct 14, 2026
Wilcox William Richard
COSTCO WHOLESALE CORP /NEW (COST) has 44 SEC Form 4 filings (87 transaction rows) in the rolling window, disclosed by 10 distinct insiders. Most recent filing: Oct 14, 2026.
Inside the rolling window, 10 insiders at COSTCO WHOLESALE CORP /NEW reported no open-market purchases and 15 open-market sales totaling $18.3M. The most active filer is Executive Vice President Adamo Claudine with 3 filings. Insiders have net sold $4.6M over the trailing 6 months. The most recent open-market filing is a sale of 1,100 shares by Executive Vice President Wilcox William Richard, dated Oct 13, 2026, worth $1.1M.
- Industry:Discount Stores
- CEO:Ron Vachris
- Employees:341,000
- HQ:Issaquah, WA, US
- IPO:1986-07-09
| Source | |||||||
|---|---|---|---|---|---|---|---|
Wilcox William RichardFirst in 11 months | Executive Vice President | Sale | 1,100 | $1.1M | Oct 14 | +1.7% | SEC ↗ |
Frates CatonFirst in 6 months | Sr. Executive Vice President | Sale | 800.638 | $733K | Sep 30 | +9.7% | SEC ↗ |
Adamo ClaudineFirst in 7 months | Executive Vice President | Sale | 2,200 | $2.0M | Sep 30 | +9.7% | SEC ↗ |
| Director | Sale | 885 | $847K | Jun 25 | +6.0% | SEC ↗ | |
Frates CatonFirst filing | Executive Vice President | Sale | 700 | $695K | Apr 1 | +0.2% | SEC ↗ |
Adamo ClaudineFirst in 5 months | Executive Vice President | Sale | 730 | $732K | Mar 11 | +0.6% | SEC ↗ |
Jones Teresa A.First filing | Executive Vice President | Sale | 850 | $838K | Jan 23 | +1.5% | SEC ↗ |
DECKER SUSAN LFirst filing | Director | Sale | 458 | $437K | Jan 20 | +3.5% | SEC ↗ |
Klauer James CFirst filing | Executive Vice President | Sale | 1,500 | $1.4M | Jan 15 | +4.3% | SEC ↗ |
Miller Russell DFirst filing | Sr. Executive Vice President | Sale | 1,500 | $1.4M | Jan 12 | +5.9% | SEC ↗ |
POLIT JAVIERFirst filing | Executive Vice President | Sale | 2,049 | $1.8M | Dec 31 | — | SEC ↗ |
POLIT JAVIERFirst filing | Executive Vice President | Sale | 558.305 | $482K | Dec 31 | — | SEC ↗ |
Wilcox William RichardFirst filing | Executive Vice President | Sale | 2,400 | $2.2M | Nov 12 | — | SEC ↗ |
Barbre Tiffany MarieFirst filing | Principal Accounting Officer | Sale | 1,239.383 | $1.2M | Oct 24 | — | SEC ↗ |
Adamo ClaudineFirst filing | Executive Vice President | Sale | 2,700 | $2.5M | Oct 24 | — | SEC ↗ |
Earnings: last 7 quarters
Congress trading COST 204 all-time
- RRep. Rich McCormickSale$1,001 - $15,0002026-07-30
- RRep. Dan NewhousePurchase$1,001 - $15,0002026-07-10
- RRep. Daniel Milton NewhousePurchase$1,001 - $15,0002026-07-10
- DRep. Gilbert Ray CisnerosPurchase$1,001 - $15,0002026-01-30
- DRep. Ro KhannaPurchase$15,001 - $50,0002026-01-13
- DRep. Ro KhannaPurchase$15,001 - $50,0002026-01-13
STOCK Act disclosures are filed up to 45 days after the trade. Amount is a disclosed range, not an exact figure.
Frequently asked questions
How many SEC Form 4 insider filings does COST have?
COSTCO WHOLESALE CORP /NEW (COST) has 44 SEC Form 4 filings (87 transaction rows) in the rolling 365-day window, disclosed by 10 distinct insiders. Most recent filing: Oct 14, 2026.
When was the most recent SEC Form 4 filing for COST?
The most recent Form 4 filing for COST on Tracefour is dated Oct 14, 2026.
Who is the most active insider at COST?
The most active SEC Form 4 filer at COST in the rolling window is Executive Vice President Adamo Claudine, with 3 filings.
What is the net insider flow at COST over the last 6 months?
Over the trailing 180 days, insiders at COST have net sold $4.6M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at COST in the current window?
Inside the rolling window, insiders at COST bought $0 and sold $18.3M based on SEC Form 4 filings.
Can I get alerts for COST insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at COSTCO WHOLESALE CORP /NEW (COST). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
COSTCO WHOLESALE CORP /NEW is in the Retail Trade sector.