ESS Tech, Inc.

ESS Tech, Inc., trading under the ticker STWO, is a long-duration energy storage company that entered public markets through a SPAC transaction, with its merger closing in 2021. The Oregon-based firm develops iron flow battery systems targeting grid-scale and commercial energy storage applications, placing it squarely in the clean energy and industrial technology sector. On May 7, 2026, ESS Tech filed an 8-K with the SEC under accession number 0001819438-26-000032, reflecting continued public reporting obligations as a post-combination operating company. The filing adds to the company's disclosure record as it navigates the competitive long-duration storage market. For full filing history, deal terms, and real-time SPAC data on ESS Tech and hundreds of other transactions, sign up for SpacDesk at spacdesk.com.