ESS Tech, Inc. — Director's Dealing 2023

May 22, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ESS Tech, Inc. (GWH)
CIK: 0001819438
Period of Report: 2023-05-19

Reporting Person: NIGGLI MICHAEL R (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-05-19	Common Stock	A	135373	—	Acquired	749194	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	85228	Indirect
Common Stock	85228	Indirect
Common Stock	85228	Indirect
Common Stock	568312	Indirect
Common Stock	227407	Indirect
Common Stock	85228	Indirect

Footnotes

F1: The reported shares are represented by restricted stock units, or RSUs, which vest on the earlier of (i) May 19, 2024 or (ii) the day prior to the Issuer's next annual meeting of stockholders.

F2: The shares are held of record by the Chloe D. Niggli Gift Trust for which the reporting person serves as trustee.

F3: The shares are held of record by the Michael R. Niggli Jr. 2021 Gift Trust for which the reporting person serves as trustee.

F4: The shares are held of record by the Lorelei A. Niggli 2021 Gift Trust for which the reporting person serves as trustee.

F5: The shares are held of record by the Linda Naviaux Niggli Trust for which the reporting person's spouse serves as trustee.

F6: The shares are held of record by the Michael R. Niggli Family Trust for which the reporting person serves as trustee.

F7: The shares are held of record by the Ian M. Niggli 2021 Gift Trust for which the reporting person serves as trustee.