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CIK 0000909832 · Large accelerated filer

COSTCO WHOLESALE CORP /NEW

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Ticker
COST
Exchange
Nasdaq
Industry
Retail-Variety Stores
FY end
Aug 30
Incorporated
WA
Entity type
operating
EIN
911223280
Phone
4253138100
Business address
999 LAKE DRIVE, ISSAQUAH, WA, 98027-
Former names
COSTCO COMPANIES INC, PRICE/COSTCO INC
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$4,777,958
in 4 filings

Net −$4,777,958. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Pace of trading Bought Sold

Who's trading

90 days

  1. Adamo Claudine −$2.0M Executive Vice President sold 24% of stake
  2. Wilcox William Richard −$1.1M Executive Vice President sold 26% of stake
  3. Jones Teresa A. −$976K Executive Vice President sold 14% of stake
  4. Frates Caton −$733K Sr. Executive Vice President sold 9% of stake

Reading 100 more Form 4s from the SEC; this list fills in as they're read.

Date Insider Transaction Shares Price Value Owned after
2026-10-22 George Sarah Catherine Executive Vice President Shares withheld for taxes −34.82 $1,018.21 $35K 3,914.79
2026-10-22 George Sarah Catherine Executive Vice President Shares withheld for taxes −46.71 $1,018.21 $48K 3,868.08
2026-10-22 Foulkes Helena Director Grant or award +266 1,352.8
2026-10-22 DENMAN KENNETH D Director Grant or award +266 5,044.94
2026-10-22 DECKER SUSAN L Director Grant or award +266 8,797.94
2026-10-22 Barbre Tiffany Marie Principal Accounting Officer Grant or award +1,965 7,120.45
2026-10-22 Barbre Tiffany Marie Principal Accounting Officer Shares withheld for taxes −90.23 $1,018.21 $92K 7,030.22
2026-10-22 Barbre Tiffany Marie Principal Accounting Officer Shares withheld for taxes −93.95 $1,018.21 $96K 6,936.27
2026-10-22 Barbre Tiffany Marie Principal Accounting Officer Shares withheld for taxes −101.54 $1,018.21 $103K 6,834.73
2026-10-22 Barbre Tiffany Marie Principal Accounting Officer Shares withheld for taxes −84.6 $1,018.21 $86K 6,750.13
2026-10-22 Barbre Tiffany Marie Principal Accounting Officer Shares withheld for taxes −166.45 $1,018.21 $169K 6,583.68
2026-10-22 Adamo Claudine Executive Vice President Shares withheld for taxes −96.94 $1,018.21 $99K 7,036.57
2026-10-22 Adamo Claudine Executive Vice President Shares withheld for taxes −198.29 $1,018.21 $202K 6,838.28
2026-10-22 Adamo Claudine Executive Vice President Shares withheld for taxes −177.06 $1,018.21 $180K 6,661.22
2026-10-22 Adamo Claudine Executive Vice President Shares withheld for taxes −110.97 $1,018.21 $113K 6,550.25
2026-10-22 Adamo Claudine Executive Vice President Shares withheld for taxes −108.61 $1,018.21 $111K 6,441.65
2026-10-13 Wilcox William Richard Executive Vice President Sale −1,100 $958.21 $1.1M 3,094.39
2026-09-29 Frates Caton Sr. Executive Vice President Sale −800.64 $915.93 $733K 7,912
2026-09-29 Adamo Claudine Executive Vice President Sale −2,200 $915.93 $2.0M 7,133.51
2026-09-10 Wilcox William Richard Executive Vice President Grant or award +4,129 6,129

Page 3 of 90 · 1,795 trades