WILSONVILLE, Ore.–(BUSINESS WIRE)–ESS Tech, Inc. (“ESS,” “ESS, Inc.” or the “Company”) (NYSE: GWH), a leading manufacturer of long-duration energy storage systems (LDES) for commercial and utility-scale applications, today announced financial results for its third quarter ended September 30, 2025. The third quarter continued ESS’s steady execution of its strategic plan. Following leadership additions and organizational alignment earlier in the year, the Company advanced key customer programs