ESS Tech, Inc. — Director's Dealing 2025

Apr 15, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ESS Tech, Inc. (GWH)
CIK: 0001819438
Period of Report: 2023-05-20

Reporting Person: Rabb Anthony (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-05-20	Common Stock	F	100	$18	Disposed	82729	Direct
2023-08-20	Common Stock	F	106	$18.15	Disposed	82623	Direct
2023-11-20	Common Stock	F	4298	$17.55	Disposed	78325	Direct
2024-02-20	Common Stock	F	1044	$13.6665	Disposed	77281	Direct
2024-05-20	Common Stock	F	1886	$12.15	Disposed	75395	Direct
2024-08-20	Common Stock	F	1886	$8.1945	Disposed	73509	Direct
2024-11-20	Common Stock	F	1889	$5.21	Disposed	71620	Direct
2025-02-20	Common Stock	F	1987	$4.81	Disposed	69633	Direct
2025-04-13	Common Stock	A	42500	—	Acquired	112133	Direct

Footnotes

F1: The reported shares were withheld by the Issuer upon vesting of restricted stock units, or RSUs, to satisfy tax withholding obligations.

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: The reported shares are represented by RSUs, which vest as to 1/16th of the RSUs on May 20, 2025 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.