ESS Tech (NYSE: GWH) CEO Drew Buckley purchases 25,000 shares in open market

Rhea-AI Filing Summary

ESS Tech, Inc. CEO Drew P. Buckley reported an open-market purchase of 25,000 shares of Common Stock. The shares were bought on June 4, 2026 at a weighted average price of $1.0264 per share across multiple trades priced between $1.0073 and $1.0299. Following this transaction, Buckley directly holds 25,000 shares of ESS Tech common stock.

Insider Trade Summary

Net Buyer: 25,000 shares ($25,660)

Net Buy 1 txn

Insider Buckley Drew P

Role CEO

Bought 25,000 shs ($26K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	25,000	$1.0264	$26K

Holdings After Transaction: Common Stock — 25,000 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares purchased: 25,000 shares Weighted average purchase price: $1.0264 per share Trade price range: $1.0073–$1.0299 per share +1 more

4 metrics

Shares purchased 25,000 shares Open-market purchase on June 4, 2026

Weighted average purchase price $1.0264 per share Common Stock, multiple trades

Trade price range $1.0073–$1.0299 per share Prices across individual transactions

Shares owned after transaction 25,000 shares Total Common Stock directly held post-purchase

Key Terms

open-market purchase, weighted average price, Common Stock, Form 4

4 terms

open-market purchase financial

"identified the transaction as an open-market purchase of Common Stock"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

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.

Common Stock financial

"25,000 shares of Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"according to the Form 4 footnote"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

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^*

Buckley Drew P

(Last) (First) (Middle)

C/O ESS TECH, INC.

26440 SW PARKWAY AVE., BLDG. 83

(Street)

WILSONVILLE OREGON 97070

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ESS Tech, Inc. [ GWH ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

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	06/04/2026		P		25,000	A	$1.0264(1)	25,000	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 reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.0073 to $1.0299, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

	/s/ Kate Suhadolnik, by power of attorney	06/08/2026
	** 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)

FAQ

What insider transaction did ESS Tech (GWH) report for CEO Drew Buckley?

ESS Tech reported that CEO Drew P. Buckley bought 25,000 shares of Common Stock. The open-market purchase occurred on June 4, 2026, and increased his direct holdings to 25,000 shares following the transaction.

At what price did ESS Tech (GWH) CEO buy the 25,000 shares?

The CEO’s 25,000-share purchase was made at a weighted average price of $1.0264 per share. Individual trades were executed at prices ranging from $1.0073 to $1.0299, according to the Form 4 footnote.

How many ESS Tech (GWH) shares does CEO Drew Buckley hold after this Form 4?

After the reported transaction, CEO Drew P. Buckley directly holds 25,000 ESS Tech common shares. The Form 4 shows this figure as the total number of shares beneficially owned following the open-market purchase.

Was the ESS Tech (GWH) CEO transaction an open-market purchase?

Yes. The filing identifies the transaction as an open-market purchase of Common Stock. It is coded as a “P” transaction, described as a purchase in an open market or private transaction under SEC reporting rules.

Did ESS Tech (GWH) CEO’s purchase occur in a single trade or multiple trades?

The CEO’s purchase was executed in multiple trades. The Form 4 notes that the reported weighted average price reflects several individual transactions, with prices ranging from $1.0073 to $1.0299 per share.