Buy GWH by Sep 21, 2026.

**Official correspondence to shareholders today via email -** **WILSONVILLE, Ore - June 23, 2026** \- ESS Tech, Inc. (NYSE: GWH) (“ESS” or the “company”), a leading provider of non-lithium energy storage solutions, today announced strong early customer engagement for its planned U.S.-made sodium-ion battery energy storage system (BESS) offering, focused on short- and medium-duration applications that have historically been served by lithium-ion systems. Since announcing its letter of intent with Alsym Energy seven weeks ago, ESS has generated significant customer …