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Investment Visual

COST

Costco Wholesale Corporation

$1,106.21+14.00 (+1.28%)Close Nov 13, 2026

Backtest COST

Insider trading

12 months to Oct 27, 2026
Sold
$14.6M
9 insiders
Largest seller
$3.29M
William Richard Wilcox · 22% of sales
Bought
$0
No buys
Latest buy
Jun 7, 2022
Mary Agnes Wilderotter

Buys and sales on the price

Since 2003

By period

Open-market trades
Trades3 months12 monthsSince 2003
Buys0011
Sales313738
Plan sales0098
Shares bought000035,78135.8K
Shares sold4,1014.10K15,73115.7K15,393,12815.4M
Net shares−4,101−4.10K−15,731−15.7K−15,357,347−15.4M
Net value−$3.80M−$14.6M−$839M

Insiders

Insider12 monthsShares held
Roland Michael Vachris
President and CEO, Director
—
62,575
Patrick J. Callans
Executive Vice President
—
60,895
as of Oct 24, 2025
Hamilton E. James
Director
—
56,955
John Christopher Sullivan
Executive VP
—
48,460
James C. Klauer
Executive Vice President
−3.2%
46,027

Trades

749 trades since 2003
TypeInsiderRoleSharesPriceHeld after
Oct 13, 2026Sale
William Richard WilcoxExecutive Vice President
Executive Vice President
Executive Vice President
1,100
at $958.21
$958.21$1.05M
−12.8%
7.50K after
7,495
Sep 29, 2026Sale
Caton FratesSr. Executive Vice President
Sr. Executive Vice President
Sr. Executive Vice President
801
at $915.93
$915.93$733K
−9.2%
Changed by trades not shown: 7.91K after
Changed by trades not shown: 7,912
Sep 29, 2026Sale
Claudine AdamoExecutive Vice President
Executive Vice President
Executive Vice President
2,200
at $915.93
$915.93$2.02M
−23.6%
Changed by trades not shown: 7.13K after
Changed by trades not shown: 7,134
Jun 23, 2026Sale
Kenneth D. DenmanDirector
Director
Director
885
at $957.45
$957.45$847K
−15.6%
4.78K after
4,779
Apr 1, 2026Sale
Caton FratesExecutive Vice President
Executive Vice President
Executive Vice President
700
at $993.00
$993.00$695K
−10.7%
5.82K after
5,815
Mar 9, 2026Sale
Claudine AdamoExecutive Vice President
Executive Vice President
Executive Vice President
730
at $1,003.02
$1,003.02$732K
−10.7%
6.12K after
6,121
Jan 21, 2026Sale
Teresa A. JonesExecutive Vice President
Executive Vice President
Executive Vice President
850
at $986.26
$986.26$838K
−16.7%
4.23K after
4,228
Jan 16, 2026Sale
Susan L. DeckerDirector
Director
Director
458
at $955.00
$955.00$437K
−5.1%
8.53K after
8,532
Jan 14, 2026Sale
James C. KlauerExecutive Vice President
Executive Vice President
Executive Vice President
1,500
at $939.00
$939.00$1.41M
−3.2%
44.9K after
44,935
Jan 9, 2026Sale
Russell D. MillerSr. Executive Vice President
Sr. Executive Vice President
Sr. Executive Vice President
1,500
at $916.32
$916.32$1.37M
−15.4%
8.24K after
8,241
  • William Richard Wilcox$1.05M
    Oct 13, 2026 · Sale1,100 at $958.21
    Executive Vice President−12.8% of holdings, 7.50K after
  • Caton Frates$733K
    Sep 29, 2026 · Sale801 at $915.93
    Sr. Executive Vice President−9.2% of holdings, Changed by trades not shown: 7.91K after
  • Claudine Adamo$2.02M
    Sep 29, 2026 · Sale2,200 at $915.93
    Executive Vice President−23.6% of holdings, Changed by trades not shown: 7.13K after
  • Kenneth D. Denman$847K
    Jun 23, 2026 · Sale885 at $957.45
    Director−15.6% of holdings, 4.78K after
  • Caton Frates$695K
    Apr 1, 2026 · Sale700 at $993.00
    Executive Vice President−10.7% of holdings, 5.82K after
  • Claudine Adamo$732K
    Mar 9, 2026 · Sale730 at $1,003.02
    Executive Vice President−10.7% of holdings, 6.12K after
  • Teresa A. Jones$838K
    Jan 21, 2026 · Sale850 at $986.26
    Executive Vice President−16.7% of holdings, 4.23K after
  • Susan L. Decker$437K
    Jan 16, 2026 · Sale458 at $955.00
    Director−5.1% of holdings, 8.53K after
  • James C. Klauer$1.41M
    Jan 14, 2026 · Sale1,500 at $939.00
    Executive Vice President−3.2% of holdings, 44.9K after
  • Russell D. Miller$1.37M
    Jan 9, 2026 · Sale1,500 at $916.32
    Sr. Executive Vice President−15.4% of holdings, 8.24K after