Costco EVP Adamo reports five tax share withholdings

The reported price for each withholding was Costco common stock’s Nasdaq closing market price on October 22, 2026.

Rhea-AI Filing Summary

Costco Wholesale Corp. Executive Vice President Claudine Adamo reported five direct common-stock tax-withholding dispositions on October 22, 2026: 97, 198, 177, 111 and 109 shares. Costco withheld the shares for taxes connected with vesting previously granted restricted stock units. Each transaction was priced at $1,018.21 per share, the closing market price of Costco common stock on Nasdaq that day. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Tax Withholding: 691.863 shares

Tax Withholding 5 txns

Insider Adamo Claudine

Role Executive Vice President

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	96.942	$1,018.21	$99K
Tax Withholding	Common Stock F1	198.289	$1,018.21	$202K
Tax Withholding	Common Stock F1	177.058	$1,018.21	$180K
Tax Withholding	Common Stock F1	110.967	$1,018.21	$113K
Tax Withholding	Common Stock F1	108.607	$1,018.21	$111K

Holdings After Transaction: Common Stock — 6,441.647 shares (Direct)

Footnotes (1)

1. F1. This transaction is a withholding by the Company for taxes in connection with the vesting of previously granted restricted stock units. The price represents the closing market price of Costco common stock on Nasdaq on October 22, 2026.

Key Figures

Shares withheld: 97 shares Shares withheld: 198 shares Shares withheld: 177 shares +3 more

6 metrics

Shares withheld 97 shares Tax withholding transaction on October 22, 2026

Shares withheld 198 shares Tax withholding transaction on October 22, 2026

Shares withheld 177 shares Tax withholding transaction on October 22, 2026

Shares withheld 111 shares Tax withholding transaction on October 22, 2026

Shares withheld 109 shares Tax withholding transaction on October 22, 2026

Price per share $1,018.21 Closing market price on Nasdaq on October 22, 2026

Key Terms

restricted stock units, vesting, closing market price

3 terms

restricted stock units financial

"vesting of previously granted restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting financial

"in connection with the vesting of previously granted restricted stock units"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

closing market price financial

"The price represents the closing market price of Costco common stock"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did COST executive Claudine Adamo have withheld?

Five direct common-stock withholding transactions were reported for October 22, 2026: 97, 198, 177, 111 and 109 shares. Costco withheld them for taxes connected with vesting previously granted restricted stock units.

What price was used for Claudine Adamo’s COST share withholdings?

Each transaction was reported at $1,018.21 per share, the closing market price of Costco common stock on Nasdaq on October 22, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/26/2026 - 06:14 PM EDT Accepted by SEC EDGAR 10/26/2026 - 06:13 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Adamo Claudine

(Last) (First) (Middle)

999 LAKE DRIVE

(Street)

ISSAQUAH WASHINGTON 98027

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
COSTCO WHOLESALE CORP /NEW [ COST ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Vice President

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/22/2026		F		96.942	D	$1,018.21(1)	7,036.568	D
Common Stock	10/22/2026		F		198.289	D	$1,018.21(1)	6,838.279	D
Common Stock	10/22/2026		F		177.058	D	$1,018.21(1)	6,661.221	D
Common Stock	10/22/2026		F		110.967	D	$1,018.21(1)	6,550.254	D
Common Stock	10/22/2026		F		108.607	D	$1,018.21(1)	6,441.647	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction is a withholding by the Company for taxes in connection with the vesting of previously granted restricted stock units. The price represents the closing market price of Costco common stock on Nasdaq on October 22, 2026.

	/s/ Alejandro Torres, Attorney-in-Fact	10/26/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)