Costco withholds 260 shares from EVP Self for taxes

The withholding was tied to vesting of previously granted restricted stock units and used the October 22 closing market price.

Rhea-AI Filing Summary

Costco Wholesale Corp. reported that 260 shares of common stock held directly by Executive Vice President Adam Webb Self were withheld by the company for taxes on October 22, 2026, in connection with vesting of previously granted restricted stock units. The five reported entries use $1,018.21 per share, the closing market price of Costco common stock on Nasdaq that day.

Insider Trade Summary

Tax Withholding: 259.767 shares

Tax Withholding 5 txns

Insider Self Adam Webb

Role Executive Vice President

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	61.663	$1,018.21	$63K
Tax Withholding	Common Stock F1	64.211	$1,018.21	$65K
Tax Withholding	Common Stock F1	57.332	$1,018.21	$58K
Tax Withholding	Common Stock F1	36.044	$1,018.21	$37K
Tax Withholding	Common Stock F1	40.517	$1,018.21	$41K

Holdings After Transaction: Common Stock — 3,269.585 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: 260 shares Closing market price: $1,018.21 per share Withholding entries: 5 transactions

3 metrics

Shares withheld 260 shares For taxes on October 22, 2026

Closing market price $1,018.21 per share Costco common stock on Nasdaq on October 22, 2026

Withholding entries 5 transactions Reported for 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 market

"price represents the closing market price of Costco common stock on Nasdaq"

FAQ

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

How many COST shares did Adam Webb Self have withheld?

Adam Webb Self, an Executive Vice President of Costco Wholesale Corp., had 260 shares of common stock withheld for taxes on October 22, 2026, as previously granted restricted stock units vested. The reported price was $1,018.21 per share, representing Costco's closing market price on Nasdaq that day.

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

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Available on EDGAR 10/27/2026 - 04:15 PM EDT Accepted by SEC EDGAR 10/27/2026 - 04:14 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^*

Self Adam Webb

(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		61.663	D	$1,018.21(1)	3,467.689	D
Common Stock	10/22/2026		F		64.211	D	$1,018.21(1)	3,403.478	D
Common Stock	10/22/2026		F		57.332	D	$1,018.21(1)	3,346.146	D
Common Stock	10/22/2026		F		36.044	D	$1,018.21(1)	3,310.102	D
Common Stock	10/22/2026		F		40.517	D	$1,018.21(1)	3,269.585	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)