ESS Tech, Inc. WT

and Exhibit 99.1 of this Current Report on Form 8-K shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amen

Entry into a Material Definitive Agreement On January 29, 2026, ESS Tech, Inc. (the “Company”) signed a securities purchase agreement (the “Purchase Agreement”)

shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by referen