ESS Tech, Inc.

ESS Tech, Inc., trading under ticker STWO, is a long-duration energy storage company that completed its SPAC merger in October 2021 after going public through ACON S2 Acquisition Corp, sponsored by Washington, D.C.-based private equity firm ACON Investments. The company, which develops iron flow battery systems for grid-scale and commercial energy storage applications, filed its first post-merger 10-Q with the SEC on November 22, 2021, covering operations as a newly public entity in the clean energy sector. The SPAC vehicle originated its IPO in 2020. For full filing history, ownership data, and deal analytics on STWO and hundreds of other SPACs, sign up for SpacDesk at spacdesk.com.