ESS Tech(GWH) - 2025 Q4 - Annual Results

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 23, 2026 ESS TECH, INC. (Exact name of registrant as specified in charter) Delaware 001-39525 98-1550150 (State or other jurisdiction of incorporation) Wilsonville, Oregon 97070 (Address of principal executive offices) (Zip code) (855) 423-9920 (Registrant's telephone number, including ...