X0306 4 2021-10-08 1 0001819438 ESS Tech, Inc. GWH 0001786657 Levy Sarah Kirshbaum C/O ACON S2 ACQUISITION CORP. 1133 CONNECTICUT AVENUE NW, STE. 700 WASHINGTON DC 20036 1 0 0 0 Common Stock 2021-10-08 4 C 0 50000 A 50000 D Class B Ordinary Shares 2021-10-08 4 C 0 50000 D Common Stock 50000 0 D Pursuant to the Agreement and Plan of Merger, dated May 6, 2021, by and among ACON S2 Acquisition Corp., a Cayman Islands exempted company (the "Company"), SCharge Merger Sub, Inc., a Delaware corporation, and ESS Tech, Inc., a Delaware corporation ("ESS"), the parties effected a business combination transaction ("Business Combination"), on October 8, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "ESS Tech, Inc." ("New ESS"). In connection with the consummation of the Business Combination, 50,000 of Sarah Kirshbaum Levy's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company converted into shares of common stock, par value $0.0001, of New ESS simultaneously with the closing of the Business Combination. /s/ Adam Kriger 2021-10-13