Drew P. Buckley - 01 Jan 2026 Form 3 Insider Report for ESS Tech, Inc. (GWH)

Role
CEO, Director
Signature
/s/ Kate Suhadolnik, by power of attorney
Issuer symbol
GWH
Transactions as of
01 Jan 2026
Net transactions value
$0
Form type
3
Filing time
29 Jan 2026, 16:21:14 UTC
Next filing
29 Jan 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Buckley Drew P CEO, Director C/O ESS TECH, INC, 26440 SW PARKWAY AVE, WILSONVILLE /s/ Kate Suhadolnik, by power of attorney 29 Jan 2026 0002106707

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding GWH Stock Option (right to buy) 01 Jan 2026 Common Stock 50,000 $2.00 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 40% of the shares subject to the option vested on October 9, 2025 and the remaining shares vest in three equal monthly installments beginning on November 30, 2025.

Remarks:

Exhibit 24 - Power of Attorney