Costco Wholesale Ownership & Insider Activity

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

Insiders own 0.5% of shares outstanding. Institutional investors hold 45.5%.

Shares Outstanding

443.514M

Shares Float

443.054M

Insider Shares Owned

2.297M

Insider % Owned

0.5%

Institutional Shares Held

201.491M

Institutional % Held

45.5%

Ownership Breakdown

Congressional Trading Activity

Date	Member	Party	Chamber	Action	Amount
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
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
Mar 27, 2025	Greg Landsman	D	House	Sale	$15,001 - $50,000
Mar 17, 2025	Marjorie Taylor Greene	R	House	Purchase	$1,001 - $15,000
Mar 3, 2025	Bruce Westerman	R	House	Purchase	$1,001 - $15,000