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Zacks Company Profile for ESS Tech, Inc. (GWH : NYSE)

• Company Description    ESS Inc. designs, builds and deploys iron flow batteries for long-duration commercial and utility-scale energy storage applications. ESS Inc., formerly known as ACON S2 Acquisition Corp., is based in WILSONVILLE, Ore. Number of Employees: 62

• Price / Volume Information    Yesterday's Closing Price: $1.17 Daily Weekly Monthly 20 Day Moving Average: 719,436 shares Shares Outstanding: 27.17 (millions) Market Capitalization: $31.79 (millions) Beta: 1.46 52 Week High: $13.87 52 Week Low: $0.76 Short Interest Ratio:   % Price Change % Price Change Relative to S&P 500 4 Week -20.41% -16.36% 12 Week -36.07% -32.75% Year To Date -37.77% -35.02%

• Address & Contact Information Street Address Phone / Fax Email Address Web URL 26440 SW Parkway Ave. Bldg. 83 - Wilsonville,OR 97070 USA ph: 855-423-9920 fax: - investors@essinc.com http://www.essinc.com

• General Corporate Information    Officers Drew Buckley - Chief Executive Officer Harry Quarls - Chairman of the Board and Director Michael Niggli - Founding Chairman and Director Kate Suhadolnik - Chief Financial Officer Raffi Garabedian - Director Peer Information ESS Tech, Inc. (REFR) ESS Tech, Inc. (BELFA) ESS Tech, Inc. (DIPC) ESS Tech, Inc. (V.SSC) ESS Tech, Inc. (BNSOF) ESS Tech, Inc. (CUB.) Industry / Sector / Ticker Info Analyst Coverage: No Industry Group: ELEC PRODS-MISC Sector: Computer and Technology CUSIP: 26916J205 SIC: 3690 Fiscal Year Fiscal Year End: December Last Reported Quarter: 12/01/25 Next Expected EPS Date: 05/21/26 Share - Related Items Shares Outstanding: 27.17 Most Recent Split Date: 8.00 (0.07:1) Beta: 1.46 Market Capitalization: $31.79 (millions)

• EPS Information     • Dividend Information Analyst Coverage: No Dividend Yield: 0.00% Current Fiscal Quarter EPS Consensus Estimate: $-0.29 Indicated Annual Dividend: $0.00 Current Fiscal Year EPS Consensus Estimate: $-1.00 Payout Ratio: Number of Estimates in the Fiscal Year Consensus: 1.00 Change In Payout Ratio: Estmated Long-Term EPS Growth Rate: % Last Dividend Paid: NA - $0.00 Next EPS Report Date: 05/21/26

• Fundamental Ratios P/E Current FY Estimate: - Trailing 12 Months: - PEG Ratio: - Price Ratios Price/Book: 3.04 Price/Cash Flow: - Price / Sales: 5.28 EPS Growth vs. Year Ago Period: 39.09% vs. Previous Quarter: -64.38% Sales Growth vs. Year Ago Period: -40.39% vs. Previous Quarter: -90.92% ROE 12/31/25 - -1,141.31 09/30/25 - -592.34 06/30/25 - -321.20 ROA 12/31/25 - -140.58 09/30/25 - -125.15 06/30/25 - -114.71 Current Ratio 12/31/25 - 1.04 09/30/25 - 0.49 06/30/25 - 0.47 Quick Ratio 12/31/25 - 1.03 09/30/25 - 0.29 06/30/25 - 0.27 Operating Margin 12/31/25 - - 09/30/25 - -1,045.28 06/30/25 - -1,217.22 Net Margin 12/31/25 - - 09/30/25 - -1,045.28 06/30/25 - -1,217.22 Pre-Tax Margin 12/31/25 - -4,007.58 09/30/25 - -1,045.28 06/30/25 - -1,217.22 Book Value 12/31/25 - 0.39 09/30/25 - -0.11 06/30/25 - 0.26 Inventory Turnover 12/31/25 - 7.16 09/30/25 - 6.81 06/30/25 - 7.42 Debt-to-Equity 12/31/25 - 1.08 09/30/25 - - 06/30/25 - 0.00 Debt-to-Capital 12/31/25 - 51.88 09/30/25 - - 06/30/25 - 0.00

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