Costco director sells 885 shares in open market

Costco Wholesale Corp. director Kenneth D. Denman reported an open-market sale of 885 shares of Costco common stock on June 23, 2026.

Accepted by SEC EDGAR 06/25/2026 - 04:12 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Costco Wholesale Corp. director Kenneth D. Denman reported an open-market sale of 885 shares of Costco common stock on June 23, 2026. The shares were sold at a weighted average price of $957.4525 per share, with individual trade prices ranging from $957.44 to $957.63 per share. After this transaction, Denman directly holds 4,778.936 shares of Costco common stock.

Insider Trade Summary

Net Seller: 885 shares

Net Sell 1 txn

Insider DENMAN KENNETH D

Role Director

Sold 885 shs ($847K)

Type	Security	Shares	Price	Value
Sale	Common Stock	885	$957.4525	$847K

Holdings After Transaction: Common Stock — 4,778.936 shares (Direct)

Footnotes (1)

1. F1. The price shown is a weighted average price for shares sold in multiple transactions; the sale prices ranged from $957.44 to $957.63 per share. The reporting person will provide the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Key Figures

Shares sold: 885 shares Weighted average sale price: $957.4525 per share Post-transaction holdings: 4,778.936 shares +1 more

4 metrics

Shares sold 885 shares Common stock sold on June 23, 2026

Weighted average sale price $957.4525 per share Open-market sale on June 23, 2026

Post-transaction holdings 4,778.936 shares Direct ownership after reported sale

Sale price range $957.44–$957.63 per share Multiple transactions aggregated in reported sale

Key Terms

open-market sale, weighted average price, non-derivative, transaction code "S"

4 terms

open-market sale financial

"transaction_action: "open-market sale" for the common stock transaction"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average price financial

"The price shown is a weighted average price for shares sold in multiple transactions"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

non-derivative financial

"transaction_type: "non-derivative" for the common stock sale"

transaction code "S" regulatory

"transaction_code: "S" described as sale in open market or private transaction"

FAQ

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

What insider transaction did Costco (COST) disclose in this Form 4?

Costco (COST) disclosed that director Kenneth D. Denman sold 885 shares of common stock in an open-market transaction on June 23, 2026. The sale was reported as a non-derivative transaction involving Costco’s regular common shares.

At what price did Kenneth D. Denman sell Costco (COST) shares?

Kenneth D. Denman sold his Costco (COST) shares at a weighted average price of $957.4525 per share. According to the filing, individual transaction prices ranged from $957.44 to $957.63 per share across multiple trades.

How many Costco (COST) shares does Kenneth D. Denman hold after the sale?

After the June 23, 2026 sale, Kenneth D. Denman holds 4,778.936 Costco (COST) common shares directly. This figure represents his reported direct ownership following the disclosed open-market sale of 885 shares.

Was the Costco (COST) insider transaction an open-market sale or another type?

The Costco (COST) insider transaction was an open-market sale of common stock. The Form 4 lists the transaction code as “S,” described as a sale in an open market or private transaction, and classifies it as a non-derivative transaction.

Did Kenneth D. Denman sell Costco (COST) derivative securities in this filing?

No derivative securities were reported as sold for Costco (COST) in this filing. The Form 4 shows only a non-derivative transaction in common stock and indicates no derivative transactions in the derivativeSummary section.

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

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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^*

DENMAN KENNETH D

(Last) (First) (Middle)

999 LAKE DRIVE

(Street)

ISSAQUAH WASHINGTON 98007

(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)
06/23/2026

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	06/23/2026		S		885	D	$957.4525(1)	4,778.936	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. The price shown is a weighted average price for shares sold in multiple transactions; the sale prices ranged from $957.44 to $957.63 per share. The reporting person will provide the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

	/s/ Alejandro Torres, Attorney-in-Fact	06/25/2026
	** 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)