ESS Tech, Inc.
About ESS Tech, Inc.
ESS Tech Inc is a long-duration energy storage company specializing in iron flow battery technology. It develops and manufactures long-duration energy storage systems based on iron flow battery technology. The company's batteries use earth-abundant materials, including iron, salt, and water, and are designed for high cycle life and recyclability. It operates as a single business operating segment, which includes all activities related to the design, engineering, and manufacturing of the company's long duration energy storage products. The company's revenue is derived from the sale of its energy storage products and from service contracts.
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Financial summary
- Revenue FY2025
- $1.6M
- Net income
- -$63.4M
- Total assets
- $51.2M
- Market cap
- $26.6M
- Gross margin
- -1748.1%
- Operating margin
- -3626.5%
- Net margin
- -4007.6%
Source: SEC EDGAR · updated Jun 8, 2026
Revenue & profit trend
Financial statements
Income statement
- Revenue
- $1.6M
- Cost of revenue
- $29.3M
- Gross profit
- -$27.7M
- Operating expenses
- $29.7M
- Operating income
- -$57.4M
- Income tax
- $0
- Net income
- -$63.4M
- EPS (basic)
- $-4.34
- EPS (diluted)
- $-4.34
Balance sheet
- Total assets
- $51.2M
- Current assets
- $26.2M
- Total liabilities
- $42.6M
- Current liabilities
- $25.3M
- Shareholders’ equity
- $8.6M
Cash flow
- Operating cash flow
- -$50.3M
- Investing cash flow
- $7.5M
- Financing cash flow
- $43.5M
- Net cash flow
- $706.0K
Statements via Polygon.io (SEC filings)
- Market cap
- $26.6M
- EPS (diluted)
- $-4.34
- Shares outstanding
- 31.0M
- Open
- —
- Day range
- –
- Prev close
- —
- Volume
- —
- IPO date
- Oct 11, 2021
Market data by Polygon.io · prices are 15-minute delayed
At a glance
- Reported a net loss of $63.4M in FY2025.
- Gross margin of -1748.1%, net margin -4007.6%.
- Trading 90% below its 52-week high.
Automatically generated from public filings and market data. Informational only — not investment advice or a recommendation to buy or sell any security.
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