Costco grants Mary Agnes Wilderotter 266 stock units

One-third of the award vests on October 22, 2027, with one-third vesting on October 22 for each of the following two years.

Rhea-AI Filing Summary

Costco Wholesale Corp. director Mary Agnes Wilderotter received a grant of 266 restricted stock units on October 22, 2026. One-third vests on October 22, 2027, and one-third on October 22 for each of the following two years. Her direct common-stock holdings after the grant were 8,527 shares. She also reported 4,696 shares held indirectly by GRAT-1; 5,056 shares had been distributed to her from the trust on July 21, 2026, in payment of an annuity.

Insider Trade Summary

Grant/Award: 266 shares

Grant/Award 2 txns

Insider Wilderotter Mary Agnes

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2, F3	266	$0.00	$0.00
holding	Common Stock F3	--	--	--

Holdings After Transaction: Common Stock — 8,526.936 shares (Direct); Common Stock — 4,696 shares (Indirect, By GRAT-1)

Footnotes (3)

1. F1. Grant of Restricted Stock Units. Vests one-third on October 22, 2027, and one-third on October 22 for the following two years.
2. F2. Not applicable. Grant of Restricted Stock Units.
3. F3. On July 21, 2026, 5,056 shares of Costco common stock were distributed to the reporting person in payment of an annuity from a grantor retained annuity trust (GRAT-1) of which she is the sole grantor, trustee and annuity beneficiary.

Key Figures

Restricted stock units granted: 266 units Reported transaction price: $0.0000 per share Direct common-stock holdings after grant: 8,527 shares +2 more

5 metrics

Restricted stock units granted 266 units October 22, 2026

Reported transaction price $0.0000 per share October 22, 2026 grant

Direct common-stock holdings after grant 8,527 shares October 22, 2026

Common shares held indirectly by GRAT-1 4,696 shares October 22, 2026

Shares distributed from GRAT-1 5,056 shares July 21, 2026; payment of an annuity

Key Terms

Restricted Stock Units, grantor retained annuity trust, annuity beneficiary

3 terms

Restricted Stock Units financial

"Grant of 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.

grantor retained annuity trust financial

"from a grantor retained annuity trust (GRAT-1)"

A grantor retained annuity trust (GRAT) is an estate-planning tool where the person who creates the trust transfers assets into it but receives fixed cash payments (an annuity) from the trust for a set number of years; whatever remains after that term passes to designated beneficiaries. It matters to investors because it can shift future appreciation of assets out of the creator’s taxable estate—like putting an asset into a timed vending machine that pays you fixed amounts while any extra value that grows inside the machine goes to heirs with reduced gift or estate tax consequences.

annuity beneficiary financial

"sole grantor, trustee and annuity beneficiary"

FAQ

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

How many COST shares did Mary Agnes Wilderotter receive in the October 2026 award?

Mary Agnes Wilderotter, a Costco director, received a grant of 266 restricted stock units on October 22, 2026. One-third vests on October 22, 2027, and one-third on October 22 for each of the following two years.

How many shares were distributed from Mary Agnes Wilderotter's GRAT?

5,056 shares of Costco common stock were distributed to Mary Agnes Wilderotter on July 21, 2026, in payment of an annuity from GRAT-1. She is the trust's sole grantor, trustee, and annuity beneficiary.

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

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Available on EDGAR 10/26/2026 - 09:28 PM EDT Accepted by SEC EDGAR 10/26/2026 - 09:28 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^*

Wilderotter Mary Agnes

(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)

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

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		A		266(1)	A	$0(2)	8,526.936(3)	D
Common Stock								4,696(3)	I	By GRAT-1

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. Grant of Restricted Stock Units. Vests one-third on October 22, 2027, and one-third on October 22 for the following two years.

2. Not applicable. Grant of Restricted Stock Units.

3. On July 21, 2026, 5,056 shares of Costco common stock were distributed to the reporting person in payment of an annuity from a grantor retained annuity trust (GRAT-1) of which she is the sole grantor, trustee and annuity beneficiary.

	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)