Costco Wholesale Ownership & Insider Activity

Costco Wholesale (COST) institutional and insider ownership, recent insider transactions and ownership breakdown.

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$3.8M total

Net Activity

Net Selling

Net Value (90d)

-$3.8M

Costco Wholesale Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Oct 13, 2026	Richard William Wilcox	EXECUTIVE VICE PRESIDENT	SELL	1.100K	$958.21	$1.1M
Sep 29, 2026	Caton Frates	SR. EXECUTIVE VICE PRESIDENT	SELL	800.638	$915.93	$733K
Sep 29, 2026	Claudine Adamo	EXECUTIVE VICE PRESIDENT	SELL	2.200K	$915.93	$2.0M
Jun 23, 2026	KENNETH DENMAN	DIRECTOR	SELL	885.000	$957.45	$847K

Date	Member	Party	Chamber	Action	Amount
Sep 18, 2026	Rick Allen	R	House	Sale	$1,001 - $15,000
Jul 30, 2026	Richard McCormick	R	House	Sale	$1,001 - $15,000
Jul 10, 2026	Dan Newhouse	R	House	Purchase	$1,001 - $15,000
Mar 27, 2026	Alan Armstrong	R	Senate	Purchase	$1,001 - $15,000
Jan 30, 2026	Gilbert Ray Cisneros	D	House	Purchase	$1,001 - $15,000
Dec 29, 2025	Markwayne Mullin	R	Senate	Purchase	$15,001 - $50,000
Dec 24, 2025	Gilbert Ray Cisneros	D	House	Sale (Partial)	$1,001 - $15,000
Nov 5, 2025	Richard McCormick	R	House	Purchase	$1,001 - $15,000
Oct 17, 2025	Shelley Moore Capito	R	Senate	Sale (Partial)	$1,001 - $15,000
Oct 17, 2025	Gilbert Ray Cisneros	D	House	Purchase	$1,001 - $15,000
Oct 9, 2025	John Boozman	R	Senate	Purchase	$1,001 - $15,000
Sep 23, 2025	Val Hoyle	D	House	Sale	$1,001 - $15,000
Jul 10, 2025	Lisa McClain	R	House	Sale	$1,001 - $15,000
Jun 17, 2025	Lisa McClain	R	House	Purchase	$1,001 - $15,000
Jun 9, 2025	Lisa McClain	R	House	Sale (Partial)	$1,001 - $15,000
May 12, 2025	Jefferson Shreve	R	House	Sale	$100,001 - $250,000
Apr 21, 2025	Bruce Westerman	R	House	Sale	$1,001 - $15,000
Mar 31, 2025	Jefferson Shreve	R	House	Sale (Partial)	$15,001 - $50,000
Mar 27, 2025	Greg Landsman	D	House	Sale	$1,001 - $15,000
Mar 27, 2025	Greg Landsman	D	House	Sale	$1,001 - $15,000