ESS Tech, Inc. — Director's Dealing 2026

Feb 26, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ESS Tech, Inc. (GWH)
CIK: 0001819438
Period of Report: 2026-02-13

Reporting Person: Goodman Kelly F. (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-13	Common Stock	A	137500	—	Acquired	218122	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-13	Stock Option (right to buy)	$1.44	A	137500	Acquired	2036-02-13	Common Stock (137500)	Direct

Footnotes

F1: The reported shares are represented by restricted stock units ("RSUs"), which vest as to 1/16th of the RSUs on May 20, 2026 and 1/16th of the RSUs shall vest quarterly thereafter, subject to the Reporting Person remaining a Service Provider to the Issuer through each such vest date.

F2: A portion of these securities are RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock.

F3: 1/16th of the shares subject to the option shall vest on May 20, 2026 and 1/16th of the shares subject to the option shall vest quarterly thereafter, subject to the Reporting Person remaining a Service Provider to the issuer through each such vest date.