Costco Wholesale Corporation (COST) Insider Trading

Over the last 3 months, COST insiders made 0 open-market buys and 1 sale, a net sale of -$847K (SEC Form 4). Over the last 6 months, 3492 institutions increased and 3401 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
1
Net (3m)
-$847.3K
Insider trades by month Buys Sells
Nov
Dec
Jan
Mar
Apr
Jun
Context3-month price -0.1%Institutions mixed (13F)
DateInsiderTypeSharesPrice
Jun 25, 2026DENMAN KENNETH DdirectorSell885$957.45
Apr 1, 2026Frates Catonofficer: Executive Vice PresidentSell700$993.00
Mar 13, 2026MILLERCHIP GARYofficer: Executive Vice PresidentTax1,154$992.23
Mar 11, 2026Adamo Claudineofficer: Executive Vice PresidentSell730$1003.02
Jan 23, 2026Jones Teresa A.officer: Executive Vice PresidentSell850$986.26
Jan 20, 2026DECKER SUSAN LdirectorSell458$955.00
Jan 20, 2026Raimondo Gina MariedirectorGrant215—
Jan 15, 2026Klauer James Cofficer: Executive Vice PresidentSell1,500$939.00
Jan 12, 2026Miller Russell Dofficer: Sr. Executive Vice PresidentSell1,500$916.32
Dec 31, 2025POLIT JAVIERofficer: Executive Vice PresidentSell2,049$867.21
Dec 31, 2025POLIT JAVIERofficer: Executive Vice PresidentSell558$862.89
Nov 12, 2025Wilcox William Richardofficer: Executive Vice PresidentSell2,400$930.13
Oct 24, 2025Callans Patrick Jofficer: Executive Vice PresidentTax191$944.68
Oct 24, 2025Sullivan John Christopherofficer: Executive VPGrant4,654—
Oct 24, 2025Sullivan John Christopherofficer: Executive VPTax421$944.68
Oct 24, 2025Adamo Claudineofficer: Executive Vice PresidentTax177$944.68
Oct 24, 2025Wilderotter Mary AgnesdirectorGrant286—
Oct 24, 2025Frates Catonofficer: Executive Vice PresidentTax758$944.68
Oct 24, 2025Frates Catonofficer: Executive Vice PresidentTax248$944.68
Oct 24, 2025Klauer James Cofficer: Executive Vice PresidentTax240$944.68
Oct 24, 2025Barbre Tiffany Marieother: Principal Accounting OfficerTax85$944.68
Oct 24, 2025Barbre Tiffany Marieother: Principal Accounting OfficerTax114$944.68
Oct 24, 2025Adamo Claudineofficer: Executive Vice PresidentTax122$944.68
Oct 24, 2025Adamo Claudineofficer: Executive Vice PresidentSell2,700$935.68
Oct 24, 2025Vachris Roland Michaeldirector, officer: President and CEOTax1,160$944.68
Oct 24, 2025Adamo Claudineofficer: Executive Vice PresidentTax199$944.68
Oct 24, 2025MILLERCHIP GARYofficer: Executive Vice PresidentGrant6,268—
Oct 24, 2025Callans Patrick Jofficer: Executive Vice PresidentTax199$944.68
Oct 24, 2025Sullivan John Christopherofficer: Executive VPTax569$944.68
Oct 24, 2025Vachris Roland Michaeldirector, officer: President and CEOGrant13,834—

Source: COST SEC Form 4 filings, latest Jun 25, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their COST positions over the last 6 months (SEC Form 13F).

Increased
3492
New positions
549
Reduced
3401
Sold out
162
Largest moves
InstitutionActionSharesFiled
BLACKROCK, INC.Reduced34.9MMay 13, 2026
BlackRock, Inc.Reduced34.2MAug 7, 2026
VANGUARD CAPITAL MANAGEMENT LLCIncreased29.0MAug 13, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position28.8MMay 15, 2026
STATE STREET CORPIncreased18.4MAug 7, 2026
STATE STREET CORPIncreased18.2MMay 15, 2026
Invesco Ltd.Increased14.0MAug 14, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position10.7MMay 8, 2026
GEODE CAPITAL MANAGEMENT, LLCIncreased10.7MMay 15, 2026
GEODE CAPITAL MANAGEMENT, LLCReduced10.6MAug 12, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCReduced10.4MAug 13, 2026
MORGAN STANLEYIncreased10.2MAug 13, 2026
MORGAN STANLEYReduced9.9MMay 15, 2026
INVESCO LTD.Reduced9.3MJul 15, 2026
BANK OF AMERICA CORP /DE/Increased7.5MMay 18, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.

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