ESS Tech, Inc.

ESS Tech, Inc. (NYSE: GWH) is a Portland, Oregon-based long-duration energy storage company that went public through a merger with ACON S2 Acquisition Corp., a blank-check vehicle sponsored by ACON Investments. The SPAC completed its initial public offering in 2020 on the New York Stock Exchange under the ticker STWO. ESS Tech develops iron flow battery systems engineered for grid-scale, long-duration energy storage applications, placing it squarely within the clean energy and utilities sector. An 8-K was filed on May 7, 2021, capturing a material corporate development during the de-SPAC process ahead of the transaction's close later that year. For complete filing history, sponsor profiles, and real-time analytics on GWH and thousands of other SPAC vehicles, sign up for full data access at SpacDesk.