[EFFECT] ESS Tech, Inc. SEC Filing Filing Impact (Neutral) Filing Sentiment (Neutral) Form Type EFFECT AI-generated analysis. How Rhea-AI works. Not financial advice. See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google Add on Google Not now Available on EDGAR 09/17/2026 - 06:05 AM Accepted by SEC EDGAR 09/17/2026 - 12:15 AM Learn about SEC filing dates ⛶ Fullscreen UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Notice of Effectiveness Effectiveness Date: September 16, 2026 4:00 P.M. Form: S-3 CIK: 0001819438 Company Name: ESS Tech, Inc. File Number: 333-298806 Source: View Original Filing on SEC EDGAR