0001628280-23-006779.txt : 20230307 0001628280-23-006779.hdr.sgml : 20230307 20230307171844 ACCESSION NUMBER: 0001628280-23-006779 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20230306 FILED AS OF DATE: 20230307 DATE AS OF CHANGE: 20230307 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: NIGGLI MICHAEL R CENTRAL INDEX KEY: 0001377160 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-39525 FILM NUMBER: 23713811 MAIL ADDRESS: STREET 1: 101 ASH STREET HQ18 CITY: SAN DIEGO STATE: CA ZIP: 92101 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: ESS Tech, Inc. CENTRAL INDEX KEY: 0001819438 STANDARD INDUSTRIAL CLASSIFICATION: MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690] IRS NUMBER: 000000000 STATE OF INCORPORATION: E9 FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 26440 SW PARKWAY AVE. STREET 2: BLDG. 83 CITY: WILSONVILLE STATE: OR ZIP: 97070 BUSINESS PHONE: (855) 423-9920 MAIL ADDRESS: STREET 1: 26440 SW PARKWAY AVE. STREET 2: BLDG. 83 CITY: WILSONVILLE STATE: OR ZIP: 97070 FORMER COMPANY: FORMER CONFORMED NAME: ACON S2 Acquisition Corp. DATE OF NAME CHANGE: 20200728 4 1 wf-form4_167822750070648.xml FORM 4 X0306 4 2023-03-06 0 0001819438 ESS Tech, Inc. GWH 0001377160 NIGGLI MICHAEL R C/O ESS TECH, INC. 26440 SW PARKWAY AVE., BLDG. 83 WILSONVILLE OR 97070 1 0 0 0 Common Stock 2023-03-06 4 P 0 5000 1.65 A 583821 D Common Stock 568312 I See footnote Common Stock 227407 I See footnote Common Stock 85228 I See footnote Common Stock 85228 I See footnote Common Stock 85228 I See footnote Common Stock 85228 I See footnote The shares are held of record by the Linda Naviaux Niggli Trust for which the reporting person's spouse serves as trustee. The shares are held of record by the Michael R. Niggli Family Trust for which the reporting person serves as trustee. The shares are held of record by the Michael R. Niggli Jr. 2021 Gift Trust for which the reporting person serves as trustee. The shares are held of record by the Chloe D. Niggli Gift Trust for which the reporting person serves as trustee. The shares are held of record by the Ian M. Niggli 2021 Gift Trust for which the reporting person serves as trustee. The shares are held of record by the Lorelei A. Niggli 2021 Gift Trust for which the reporting person serves as trustee. /s/Kelly F. Goodman, by power of attorney for Michael R. Niggli 2023-03-08 EX-24 2 ess-section16poaniggli.htm POWER OF ATTORNEY

POWER OF ATTORNEY

The undersigned, as a Section 16 reporting person of ESS Tech, Inc. (the "Company"),
hereby constitutes and appoints Eric P. Dresselhuys, Anthony Rabb and Kelly F. Goodman, and
each of them, as the undersigned's true and lawful attorney-in-fact to:

1. complete and execute Forms 3, 4 and 5 and other forms and all amendments
thereto as such attorney-in-fact shall in his or her discretion determine to be
required or advisable pursuant to Section 16 of the Securities Exchange Act of
1934 (as amended) and the rules and regulations promulgated thereunder, or any
successor laws and regulations, as a consequence of the undersigned's
ownership, acquisition or disposition of securities of the Company; and

2. do all acts necessary in order to file such forms with the SEC, any securities
exchange or national association, the Company and such other person or agency
as such attorney-in-fact shall deem appropriate.

The undersigned hereby ratifies and confirms all that said attorneys-in-fact and agents
shall do or cause to be done by virtue hereof. The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934 (as amended).

This Power of Attorney shall remain in full force and effect until the undersigned is no
longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier revoked by the undersigned in a
signed writing delivered to the Company and the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 2nd day of December, 2022.

Signature: /s/Michael Niggli

Print Name: Michael Niggli