ESS Tech, Inc.

ESS Tech, Inc., an Oregon-based developer of long-duration iron flow battery systems for grid-scale energy storage, filed an S-1 registration statement with the SEC on December 27, 2021, under the ticker STWO. The company entered public markets through a SPAC merger in 2021, joining the clean energy and energy storage sector with its proprietary iron flow battery technology designed to deliver low-cost, grid-scale electricity storage over extended durations. The filing, carrying accession number 0001193125-21-367045, was submitted following the close of its de-SPAC transaction. Investors tracking clean energy SPAC transactions can access full filing history, sponsor data, and deal metrics for ESS Tech and hundreds of other SPACs by signing up at SpacDesk.