ESS Tech, Inc. — Director's Dealing 2026

Jan 29, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ESS Tech, Inc. (GWH)
CIK: 0001819438
Period of Report: 2026-01-28

Reporting Person: Buckley Drew P (Director, CEO)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-01-28	Stock Option (right to buy)	$1.68	A	550000	Acquired	2036-01-28	Common Stock (550000)	Direct

Footnotes

F1: 25 % of the shares subject to the option will vest on February 20, 2027 and 1/16th of the shares subject to the option shall vest quarterly thereafter, subject to the Reporting Person remains as Service Provider to the issuer through each such vest date.