ESS Tech, Inc.

ESS Tech, Inc. is an Oregon-based long-duration energy storage company that went public through a business combination with ACON S2 Acquisition Corp, a blank-check vehicle that traded on the Nasdaq under the ticker STWO. The SPAC was sponsored by ACON S2 Management, LLC, an affiliate of Washington, D.C.-based private equity firm ACON Investments, and priced its IPO in 2020. ESS Tech focuses on iron flow battery technology for grid-scale and commercial energy storage applications, placing it squarely in the clean energy and industrials sector. The business combination closed in October 2021, after which the combined company traded on NYSE American under the ticker GWH. An 8-K was filed in August 2024 as part of the company's ongoing public reporting obligations. Visit SpacDesk and sign up for full data, filings, and analytics on ESS Tech and the broader SPAC universe.