English

ESS Tech, Inc.

EDGAR

GWH Registration statement (S-3) · filed 2026-09-08

Annual consolidated revenue for 2025: about USD 1.583M, using the latest reported figures. The previous period, 2024, was about USD 6.295M.

Inspect reported changes Compare with another company Historical disclosures Search filings Segments

Watchlist

Latest quarter

Revenue

73 thousand USD

2026 Q2 · USD

Exact inputs and evidence

Revenue: 73000 USD Source

Operating margin

-20,731.51%

2026 Q2 · %

Exact inputs and evidence

Operating Income: -15134000 USD Source
Revenue: 73000 USD Source

Operating cash flow

-8.9 million USD

2026 Q2 · USD

Exact inputs and evidence

Operating Cash Flow: -22400000 USD Source
Operating Cash Flow: -13500000 USD Source

Free cash flow

-9.4 million USD

2026 Q2 · USD

Exact inputs and evidence

Operating Cash Flow: -22400000 USD Source
Operating Cash Flow: -13500000 USD Source
Capital Expenditure: 1432000 USD Source
Capital Expenditure: 930000 USD Source

Cash and cash equivalents: 10.8 million USD 2026-06-30 Source
Exact value

10848000 USD
Long-term debt including current maturities: 0 USD 2023-12-31 Source
Exact value

0 USD
Shares outstanding: 32.9 million shares 2026-06-30 Source
Exact value

32889323 shares

Reported share-count change

155.03% · 20 million shares

Year-over-year change in reported shares. Splits, issuance and buybacks can affect this figure; it does not isolate employee compensation or economic dilution.

Exact inputs and evidence

12896146 shares · 2025-06-30· Source
32889323 shares · 2026-06-30· Source

Trailing twelve months

The four most recent complete quarters added together. This gives a full-year view that includes the latest quarterly results.

Revenue

-1.17 million USD

2025-07-01 – 2026-06-30

Exact inputs and evidence

Revenue: 214000 USD · 2025-07-01 – 2025-09-30 Source
Revenue: 1583000 USD · 2025-01-01 – 2025-12-31 Source
Revenue: 3171000 USD · 2025-01-01 – 2025-09-30 Source
Revenue: 128000 USD · 2026-01-01 – 2026-03-31 Source
Revenue: 73000 USD · 2026-04-01 – 2026-06-30 Source

Net income

-65.8 million USD

2025-07-01 – 2026-06-30

Exact inputs and evidence

Net income: -10375000 USD · 2025-07-01 – 2025-09-30 Source
Net income: -63400000 USD · 2025-01-01 – 2025-12-31 Source
Net income: -39500000 USD · 2025-01-01 – 2025-09-30 Source
Net income: -15922000 USD · 2026-01-01 – 2026-03-31 Source
Net income: -15553000 USD · 2026-04-01 – 2026-06-30 Source

Operating cash flow

-42.1 million USD

2025-07-01 – 2026-06-30

Exact inputs and evidence

Operating cash flow: -36400000 USD · 2025-01-01 – 2025-09-30 Source
Operating cash flow: -30597000 USD · 2025-01-01 – 2025-06-30 Source
Operating cash flow: -50300000 USD · 2025-01-01 – 2025-12-31 Source
Operating cash flow: -36400000 USD · 2025-01-01 – 2025-09-30 Source
Operating cash flow: -13500000 USD · 2026-01-01 – 2026-03-31 Source
Operating cash flow: -22400000 USD · 2026-01-01 – 2026-06-30 Source
Operating cash flow: -13500000 USD · 2026-01-01 – 2026-03-31 Source

Includes later revisions to earlier periods. Annual charts exclude incomplete years.

Latest filing recorded: 2026-09-08.

Financial data available through: 2025-12-31.

Coverage by financial measure

Revenue: 7 of 11 periods available· newest 2025-12-31
Operating income: 7 of 11 periods available· newest 2025-12-31
Net income: 7 of 11 periods available· newest 2025-12-31
Operating cash flow: 7 of 11 periods available· newest 2025-12-31
Capital expenditure: 7 of 11 periods available· newest 2025-12-31
Total assets: 7 of 11 periods available· newest 2025-12-31
Total liabilities: 7 of 11 periods available· newest 2025-12-31
Current assets: 7 of 11 periods available· newest 2025-12-31
Current liabilities: 7 of 11 periods available· newest 2025-12-31
Cash and cash equivalents: 7 of 11 periods available· newest 2025-12-31
Long-term debt including current maturities: 4 of 11 periods available· newest 2023-12-31
Shares outstanding: 7 of 11 periods available· newest 2025-12-31

Coverage describes values retained in this snapshot. Missing values are not zero; loading limits are reported separately.

What changed year over year

Latest complete year compared with the corresponding period one year earlier. These are measured changes; they do not establish their business causes.

Revenue
-74.9%

Prior period

USD 6.3 million

2024-01-01 – 2024-12-31
Current period

USD 1.58 million

2025-01-01 – 2025-12-31

Exact inputs and evidence

1583000 − 6295000 = -4712000 USD

6295000 USD · 2024-01-01 – 2024-12-31
Inspect prior input Prior source
1583000 USD · 2025-01-01 – 2025-12-31
Inspect current input Current source

Share or cite

Citation for Year-over-year change in Revenue · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Year-over-year change in Revenue: -4712000 USD Concept: fundies:Revenue Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#period-changes-title Computed: Current period minus corresponding prior-year period Input fundies:Revenue: 1583000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#1409513 Filing: 000181943826000012 Input fundies:Revenue: 6295000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#1410486 Filing: 000181943826000012
The citation records this snapshot. The page link may show a newer release later.
Net income
+USD 22.82 million

Prior period

−USD 86.22 million

2024-01-01 – 2024-12-31
Current period

−USD 63.4 million

2025-01-01 – 2025-12-31

Exact inputs and evidence

-63400000 − -86222000 = 22822000 USD

-86222000 USD · 2024-01-01 – 2024-12-31
Inspect prior input Prior source
-63400000 USD · 2025-01-01 – 2025-12-31
Inspect current input Current source

Share or cite

Citation for Year-over-year change in Net income · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Year-over-year change in Net income: 22822000 USD Concept: fundies:NetIncome Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#period-changes-title Computed: Current period minus corresponding prior-year period Input fundies:NetIncome: -63400000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#902140 Filing: 000181943826000012 Input fundies:NetIncome: -86222000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#827296 Filing: 000181943826000012
The citation records this snapshot. The page link may show a newer release later.
Operating cash flow
+USD 21.92 million

Prior period

−USD 72.22 million

2024-01-01 – 2024-12-31
Current period

−USD 50.3 million

2025-01-01 – 2025-12-31

Exact inputs and evidence

-50300000 − -72219000 = 21919000 USD

-72219000 USD · 2024-01-01 – 2024-12-31
Inspect prior input Prior source
-50300000 USD · 2025-01-01 – 2025-12-31
Inspect current input Current source

Share or cite

Citation for Year-over-year change in Operating cash flow · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Year-over-year change in Operating cash flow: 21919000 USD Concept: fundies:OperatingCashFlow Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#period-changes-title Computed: Current period minus corresponding prior-year period Input fundies:OperatingCashFlow: -50300000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#902300 Filing: 000181943826000012 Input fundies:OperatingCashFlow: -72219000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#850531 Filing: 000181943826000012
The citation records this snapshot. The page link may show a newer release later.
Capital expenditure
-53.6%

Prior period

USD 7.29 million

2024-01-01 – 2024-12-31
Current period

USD 3.39 million

2025-01-01 – 2025-12-31

Exact inputs and evidence

3387000 − 7294000 = -3907000 USD

7294000 USD · 2024-01-01 – 2024-12-31
Inspect prior input Prior source
3387000 USD · 2025-01-01 – 2025-12-31
Inspect current input Current source

Share or cite

Citation for Year-over-year change in Capital expenditure · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Year-over-year change in Capital expenditure: -3907000 USD Concept: fundies:CapitalExpenditure Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#period-changes-title Computed: Current period minus corresponding prior-year period Input fundies:CapitalExpenditure: 3387000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#852169 Filing: 000181943826000012 Input fundies:CapitalExpenditure: 7294000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#852759 Filing: 000181943826000012
The citation records this snapshot. The page link may show a newer release later.

Where revenue goes

How a period’s revenue divides into costs and what remains as profit. Items marked Derived are calculated by subtraction from reported figures.

2025 2025-01-01 – 2025-12-31

Revenue USD 1.58 million 100% of revenue
Cost of revenue USD 29.26 million 1,848% of revenue
Operating expenses USD 29.74 million 1,878% of revenue
Operating income −USD 57.41 million −3,626% of revenue
Tax, interest and other Derived USD 5.99 million 379% of revenue
Net income −USD 63.4 million −4,005% of revenue

Cash

Operating cash flow −USD 50.3 million −3,178% of revenue
Capital expenditure USD 3.39 million 214% of revenue
Free cash flow Derived −USD 53.69 million −3,391% of revenue

Share of revenue by period

Net income
Tax, interest and other
Operating costs

2019 Not shown: operating income or net income is not reported.
2020 Not shown: operating income or net income is not reported.
2021 Not shown: operating income or net income is not reported.
2022 Operating loss: operating costs were 11,900% of revenue.
2023 Operating loss: operating costs were 1,239% of revenue.
2024 Operating loss: operating costs were 1,526% of revenue.
2025 Operating loss: operating costs were 3,726% of revenue.

Values and sources

Revenue breakdown by annual reporting period
Period	Revenue	Operating costs	Operating income	Tax, interest and other	Net income	Free cash flow	Source
2019 2019-01-01 – 2019-12-31	0	9889000 Derived	-9889000	1578000 Derived	-11467000	-7526000 Derived	Source 2019-01-01 – 2019-12-31: 0 USD Inspect Revenue Open source 2019-01-01 – 2019-12-31: -9889000 USD Inspect Operating Income Open source 2019-01-01 – 2019-12-31: -11467000 USD Inspect Net Income Open source 2019-01-01 – 2019-12-31: -6675000 USD Inspect Operating Cash Flow Open source 2019-01-01 – 2019-12-31: 851000 USD Inspect Capital Expenditure Open source
2020 2020-01-01 – 2020-12-31	0	17392000 Derived	-17392000	13027000 Derived	-30419000	-17147000 Derived	Source 2020-01-01 – 2020-12-31: 0 USD Inspect Revenue Open source 2020-01-01 – 2020-12-31: -17392000 USD Inspect Operating Income Open source 2020-01-01 – 2020-12-31: -30419000 USD Inspect Net Income Open source 2020-01-01 – 2020-12-31: -16645000 USD Inspect Operating Cash Flow Open source 2020-01-01 – 2020-12-31: 502000 USD Inspect Capital Expenditure Open source
2021 2021-01-01 – 2021-12-31	0	60602000 Derived	-60602000	416515000 Derived	-477117000	-54616000 Derived	Source 2021-01-01 – 2021-12-31: 0 USD Inspect Revenue Open source 2021-01-01 – 2021-12-31: -60602000 USD Inspect Operating Income Open source 2021-01-01 – 2021-12-31: -477117000 USD Inspect Net Income Open source 2021-01-01 – 2021-12-31: -51849000 USD Inspect Operating Cash Flow Open source 2021-01-01 – 2021-12-31: 2767000 USD Inspect Capital Expenditure Open source
2022 2022-01-01 – 2022-12-31	894000	106386000 Derived	-105492000	-27523000 Derived	-77969000	-95800000 Derived	Source 2022-01-01 – 2022-12-31: 894000 USD Inspect Revenue Open source 2022-01-01 – 2022-12-31: -105492000 USD Inspect Operating Income Open source 2022-01-01 – 2022-12-31: -77969000 USD Inspect Net Income Open source 2022-01-01 – 2022-12-31: -81620000 USD Inspect Operating Cash Flow Open source 2022-01-01 – 2022-12-31: 14180000 USD Inspect Capital Expenditure Open source
2023 2023-01-01 – 2023-12-31	7540000	93445000 Derived	-85905000	-8327000 Derived	-77578000	-60686000 Derived	Source 2023-01-01 – 2023-12-31: 7540000 USD Inspect Revenue Open source 2023-01-01 – 2023-12-31: -85905000 USD Inspect Operating Income Open source 2023-01-01 – 2023-12-31: -77578000 USD Inspect Net Income Open source 2023-01-01 – 2023-12-31: -54896000 USD Inspect Operating Cash Flow Open source 2023-01-01 – 2023-12-31: 5790000 USD Inspect Capital Expenditure Open source
2024 2024-01-01 – 2024-12-31	6295000	96093000 Derived	-89798000	-3576000 Derived	-86222000	-79513000 Derived	Source 2024-01-01 – 2024-12-31: 6295000 USD Inspect Revenue Open source 2024-01-01 – 2024-12-31: -89798000 USD Inspect Operating Income Open source 2024-01-01 – 2024-12-31: -86222000 USD Inspect Net Income Open source 2024-01-01 – 2024-12-31: -72219000 USD Inspect Operating Cash Flow Open source 2024-01-01 – 2024-12-31: 7294000 USD Inspect Capital Expenditure Open source
2025 2025-01-01 – 2025-12-31	1583000	58990000 Derived	-57407000	5993000 Derived	-63400000	-53687000 Derived	Source 2025-01-01 – 2025-12-31: 1583000 USD Inspect Revenue Open source 2025-01-01 – 2025-12-31: -57407000 USD Inspect Operating Income Open source 2025-01-01 – 2025-12-31: -63400000 USD Inspect Net Income Open source 2025-01-01 – 2025-12-31: -50300000 USD Inspect Operating Cash Flow Open source 2025-01-01 – 2025-12-31: 3387000 USD Inspect Capital Expenditure Open source

Amounts are exact, in USD.

Growth

Sales over time and how quickly they are changing.

Revenue

Revenue reported for each complete financial period.

USD 1.6M 2025

Values and sources

Revenue values and source evidence
Period	Series	Value(USD)	Source evidence
20192019-12-31	Revenue	0	Revenue: 0 Open source
20202020-12-31	Revenue	0	Revenue: 0 Open source
20212021-12-31	Revenue	0	Revenue: 0 Open source
20222022-12-31	Revenue	894000	Revenue: 894000 Open source
20232023-12-31	Revenue	7540000	Revenue: 7540000 Open source
20242024-12-31	Revenue	6295000	Revenue: 6295000 Open source
20252025-12-31	Revenue	1583000	Revenue: 1583000 Open source

Revenue growth

Change in revenue from the same financial period one year earlier.

-74.9% 2025

Values and sources

Revenue growth values and source evidence
Period	Series	Value	Source evidence
20192019-12-31	Year over year	No prior comparable period	Revenue: 0 Open source
20202020-12-31	Year over year	No prior comparable period	Revenue: 0 Open source Revenue: 0 Open source
20212021-12-31	Year over year	No prior comparable period	Revenue: 0 Open source Revenue: 0 Open source
20222022-12-31	Year over year	No prior comparable period	Revenue: 894000 Open source Revenue: 0 Open source
20232023-12-31	Year over year	743.4%	Revenue: 7540000 Open source Revenue: 894000 Open source
20242024-12-31	Year over year	-16.5%	Revenue: 6295000 Open source Revenue: 7540000 Open source
20252025-12-31	Year over year	-74.9%	Revenue: 1583000 Open source Revenue: 6295000 Open source

Profit and cash

How much revenue becomes profit, and how much cash operations generate.

Profit margins

Operating income, net income and free cash flow as a share of revenue.

Operating margin -3,626.5% 2025

Net margin -4,005.1% 2025

Free cash flow margin -3,391.5% 2025

Operating margin
Net margin
Free cash flow margin

Values and sources

Profit margins values and source evidence
Period	Series	Value	Source evidence
20192019-12-31	Operating margin	Not reported	Operating Income: -9889000 Open source Revenue: 0 Open source
20202020-12-31	Operating margin	Not reported	Operating Income: -17392000 Open source Revenue: 0 Open source
20212021-12-31	Operating margin	Not reported	Operating Income: -60602000 Open source Revenue: 0 Open source
20222022-12-31	Operating margin	-11,800%	Operating Income: -105492000 Open source Revenue: 894000 Open source
20232023-12-31	Operating margin	-1,139.3%	Operating Income: -85905000 Open source Revenue: 7540000 Open source
20242024-12-31	Operating margin	-1,426.5%	Operating Income: -89798000 Open source Revenue: 6295000 Open source
20252025-12-31	Operating margin	-3,626.5%	Operating Income: -57407000 Open source Revenue: 1583000 Open source
20192019-12-31	Net margin	Not reported	Net Income: -11467000 Open source Revenue: 0 Open source
20202020-12-31	Net margin	Not reported	Net Income: -30419000 Open source Revenue: 0 Open source
20212021-12-31	Net margin	Not reported	Net Income: -477117000 Open source Revenue: 0 Open source
20222022-12-31	Net margin	-8,721.4%	Net Income: -77969000 Open source Revenue: 894000 Open source
20232023-12-31	Net margin	-1,028.9%	Net Income: -77578000 Open source Revenue: 7540000 Open source
20242024-12-31	Net margin	-1,369.7%	Net Income: -86222000 Open source Revenue: 6295000 Open source
20252025-12-31	Net margin	-4,005.1%	Net Income: -63400000 Open source Revenue: 1583000 Open source
20192019-12-31	Free cash flow margin	Not reported	Revenue: 0 Open source Operating Cash Flow: -6675000 Open source Capital Expenditure: 851000 Open source
20202020-12-31	Free cash flow margin	Not reported	Revenue: 0 Open source Operating Cash Flow: -16645000 Open source Capital Expenditure: 502000 Open source
20212021-12-31	Free cash flow margin	Not reported	Revenue: 0 Open source Operating Cash Flow: -51849000 Open source Capital Expenditure: 2767000 Open source
20222022-12-31	Free cash flow margin	-10,715.9%	Revenue: 894000 Open source Operating Cash Flow: -81620000 Open source Capital Expenditure: 14180000 Open source
20232023-12-31	Free cash flow margin	-804.9%	Revenue: 7540000 Open source Operating Cash Flow: -54896000 Open source Capital Expenditure: 5790000 Open source
20242024-12-31	Free cash flow margin	-1,263.1%	Revenue: 6295000 Open source Operating Cash Flow: -72219000 Open source Capital Expenditure: 7294000 Open source
20252025-12-31	Free cash flow margin	-3,391.5%	Revenue: 1583000 Open source Operating Cash Flow: -50300000 Open source Capital Expenditure: 3387000 Open source

Operating cash flow

Cash generated by the company’s normal business operations.

USD -50.3M 2025

Values and sources

Operating cash flow values and source evidence
Period	Series	Value(USD)	Source evidence
20192019-12-31	Operating cash flow	-6675000	Operating Cash Flow: -6675000 Open source
20202020-12-31	Operating cash flow	-16645000	Operating Cash Flow: -16645000 Open source
20212021-12-31	Operating cash flow	-51849000	Operating Cash Flow: -51849000 Open source
20222022-12-31	Operating cash flow	-81620000	Operating Cash Flow: -81620000 Open source
20232023-12-31	Operating cash flow	-54896000	Operating Cash Flow: -54896000 Open source
20242024-12-31	Operating cash flow	-72219000	Operating Cash Flow: -72219000 Open source
20252025-12-31	Operating cash flow	-50300000	Operating Cash Flow: -50300000 Open source

Free cash flow

Operating cash flow minus capital expenditure for the same period and unit.

USD -53.7M 2025

Values and sources

Free cash flow values and source evidence
Period	Series	Value(USD)	Source evidence
20192019-12-31	Free cash flow	-7526000	Operating Cash Flow: -6675000 Open source Capital Expenditure: 851000 Open source
20202020-12-31	Free cash flow	-17147000	Operating Cash Flow: -16645000 Open source Capital Expenditure: 502000 Open source
20212021-12-31	Free cash flow	-54616000	Operating Cash Flow: -51849000 Open source Capital Expenditure: 2767000 Open source
20222022-12-31	Free cash flow	-95800000	Operating Cash Flow: -81620000 Open source Capital Expenditure: 14180000 Open source
20232023-12-31	Free cash flow	-60686000	Operating Cash Flow: -54896000 Open source Capital Expenditure: 5790000 Open source
20242024-12-31	Free cash flow	-79513000	Operating Cash Flow: -72219000 Open source Capital Expenditure: 7294000 Open source
20252025-12-31	Free cash flow	-53687000	Operating Cash Flow: -50300000 Open source Capital Expenditure: 3387000 Open source

Balance sheet

Liabilities and short-term ability to meet obligations at each period end.

Liabilities to assets

Total liabilities as a share of total assets.

83.2% 2025

Values and sources

Liabilities to assets values and source evidence
Period	Series	Value	Source evidence
20192019-12-31	Liabilities / assets	89.5%	Total Liabilities: 18926000 Open source Total Assets: 21140000 Open source
20202020-12-31	Liabilities / assets	409.1%	Total Liabilities: 36911000 Open source Total Assets: 9023000 Open source
20212021-12-31	Liabilities / assets	18%	Total Liabilities: 45040000 Open source Total Assets: 250199000 Open source
20222022-12-31	Liabilities / assets	21.1%	Total Liabilities: 36579000 Open source Total Assets: 173553000 Open source
20232023-12-31	Liabilities / assets	27.8%	Total Liabilities: 39875000 Open source Total Assets: 143232000 Open source
20242024-12-31	Liabilities / assets	59.8%	Total Liabilities: 42929000 Open source Total Assets: 71813000 Open source
20252025-12-31	Liabilities / assets	83.2%	Total Liabilities: 42554000 Open source Total Assets: 51172000 Open source

Current assets to current liabilities

Current assets divided by current liabilities.

1.04× 2025

Values and sources

Current assets to current liabilities values and source evidence
Period	Series	Value	Source evidence
20192019-12-31	Current assets / current liabilities	6.56×	Current Assets: 18948000 Open source Current Liabilities: 2888000 Open source
20202020-12-31	Current assets / current liabilities	0.82×	Current Assets: 6861000 Open source Current Liabilities: 8394000 Open source
20212021-12-31	Current assets / current liabilities	18.02×	Current Assets: 245518000 Open source Current Liabilities: 13622000 Open source
20222022-12-31	Current assets / current liabilities	5.42×	Current Assets: 151636000 Open source Current Liabilities: 27993000 Open source
20232023-12-31	Current assets / current liabilities	5.97×	Current Assets: 118098000 Open source Current Liabilities: 19766000 Open source
20242024-12-31	Current assets / current liabilities	1.57×	Current Assets: 43364000 Open source Current Liabilities: 27602000 Open source
20252025-12-31	Current assets / current liabilities	1.04×	Current Assets: 26247000 Open source Current Liabilities: 25292000 Open source

Cash generation

Compare reported profit with operating cash and capital spending. Free cash flow is calculated as operating cash flow minus capital expenditure when both exact, consolidated amounts match the same period and unit.

Cash generation by annual reporting period
Period	Net income	Operating cash flow	Capital expenditure	Free cash flow
2019 2019-01-01 – 2019-12-31	−USD 11.47 million Exact value Exact value: -11467000 USD 2019-01-01 – 2019-12-31: -11467000 USD Inspect Net Income Open source Share or cite Citation for Net Income · ESS Tech, Inc. · 2019-12-31 ESS Tech, Inc. (edgar:1819438) Net Income: -11467000 USD Concept: fundies:NetIncome Period: 2019-01-01 to 2019-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ANetIncome&period=2019-12-31&surface=latest&period_type=duration&start=2019-01-01&unit=USD&dimensions= Input fundies:NetIncome: -11467000 USD (2019-01-01 to 2019-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000119312521367045/d238534ds1.htm#3128924 Filing: 000119312521367045 The citation records this snapshot. The page link may show a newer release later.	−USD 6.68 million Exact value Exact value: -6675000 USD 2019-01-01 – 2019-12-31: -6675000 USD Inspect Operating Cash Flow Open source Share or cite Citation for Operating Cash Flow · ESS Tech, Inc. · 2019-12-31 ESS Tech, Inc. (edgar:1819438) Operating Cash Flow: -6675000 USD Concept: fundies:OperatingCashFlow Period: 2019-01-01 to 2019-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3AOperatingCashFlow&period=2019-12-31&surface=latest&period_type=duration&start=2019-01-01&unit=USD&dimensions= Input fundies:OperatingCashFlow: -6675000 USD (2019-01-01 to 2019-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000119312521367045/d238534ds1.htm#3005581 Filing: 000119312521367045 The citation records this snapshot. The page link may show a newer release later.	USD 851,000 Exact value Exact value: 851000 USD 2019-01-01 – 2019-12-31: 851000 USD Inspect Capital Expenditure Open source Share or cite Citation for Capital Expenditure · ESS Tech, Inc. · 2019-12-31 ESS Tech, Inc. (edgar:1819438) Capital Expenditure: 851000 USD Concept: fundies:CapitalExpenditure Period: 2019-01-01 to 2019-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ACapitalExpenditure&period=2019-12-31&surface=latest&period_type=duration&start=2019-01-01&unit=USD&dimensions= Input fundies:CapitalExpenditure: 851000 USD (2019-01-01 to 2019-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000119312521367045/d238534ds1.htm#3008448 Filing: 000119312521367045 The citation records this snapshot. The page link may show a newer release later.	−USD 7.53 million Calculation and evidence -6675000 − 851000 USD Exact free cash flow: -7526000 USD 2019-01-01 – 2019-12-31: -6675000 USD · Inspect Operating Cash Flow · Source 2019-01-01 – 2019-12-31: 851000 USD · Inspect Capital Expenditure · Source Share or cite Citation for Free cash flow · ESS Tech, Inc. · 2019-12-31 ESS Tech, Inc. (edgar:1819438) Free cash flow: -7526000 USD Concept: free-cash-flow Period: 2019-01-01 to 2019-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#cash-generation-title Computed: Operating cash flow minus capital expenditure Input fundies:OperatingCashFlow: -6675000 USD (2019-01-01 to 2019-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000119312521367045/d238534ds1.htm#3005581 Filing: 000119312521367045 Input fundies:CapitalExpenditure: 851000 USD (2019-01-01 to 2019-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000119312521367045/d238534ds1.htm#3008448 Filing: 000119312521367045 The citation records this snapshot. The page link may show a newer release later.
2020 2020-01-01 – 2020-12-31	−USD 30.42 million Exact value Exact value: -30419000 USD 2020-01-01 – 2020-12-31: -30419000 USD Inspect Net Income Open source Share or cite Citation for Net Income · ESS Tech, Inc. · 2020-12-31 ESS Tech, Inc. (edgar:1819438) Net Income: -30419000 USD Concept: fundies:NetIncome Period: 2020-01-01 to 2020-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ANetIncome&period=2020-12-31&surface=latest&period_type=duration&start=2020-01-01&unit=USD&dimensions= Input fundies:NetIncome: -30419000 USD (2020-01-01 to 2020-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828022005026/ghw-20211231.htm#1005153 Filing: 000162828022005026 The citation records this snapshot. The page link may show a newer release later.	−USD 16.65 million Exact value Exact value: -16645000 USD 2020-01-01 – 2020-12-31: -16645000 USD Inspect Operating Cash Flow Open source Share or cite Citation for Operating Cash Flow · ESS Tech, Inc. · 2020-12-31 ESS Tech, Inc. (edgar:1819438) Operating Cash Flow: -16645000 USD Concept: fundies:OperatingCashFlow Period: 2020-01-01 to 2020-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3AOperatingCashFlow&period=2020-12-31&surface=latest&period_type=duration&start=2020-01-01&unit=USD&dimensions= Input fundies:OperatingCashFlow: -16645000 USD (2020-01-01 to 2020-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828022005026/ghw-20211231.htm#1034830 Filing: 000162828022005026 The citation records this snapshot. The page link may show a newer release later.	USD 502,000 Exact value Exact value: 502000 USD 2020-01-01 – 2020-12-31: 502000 USD Inspect Capital Expenditure Open source Share or cite Citation for Capital Expenditure · ESS Tech, Inc. · 2020-12-31 ESS Tech, Inc. (edgar:1819438) Capital Expenditure: 502000 USD Concept: fundies:CapitalExpenditure Period: 2020-01-01 to 2020-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ACapitalExpenditure&period=2020-12-31&surface=latest&period_type=duration&start=2020-01-01&unit=USD&dimensions= Input fundies:CapitalExpenditure: 502000 USD (2020-01-01 to 2020-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828022005026/ghw-20211231.htm#1037905 Filing: 000162828022005026 The citation records this snapshot. The page link may show a newer release later.	−USD 17.15 million Calculation and evidence -16645000 − 502000 USD Exact free cash flow: -17147000 USD 2020-01-01 – 2020-12-31: -16645000 USD · Inspect Operating Cash Flow · Source 2020-01-01 – 2020-12-31: 502000 USD · Inspect Capital Expenditure · Source Share or cite Citation for Free cash flow · ESS Tech, Inc. · 2020-12-31 ESS Tech, Inc. (edgar:1819438) Free cash flow: -17147000 USD Concept: free-cash-flow Period: 2020-01-01 to 2020-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#cash-generation-title Computed: Operating cash flow minus capital expenditure Input fundies:OperatingCashFlow: -16645000 USD (2020-01-01 to 2020-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828022005026/ghw-20211231.htm#1034830 Filing: 000162828022005026 Input fundies:CapitalExpenditure: 502000 USD (2020-01-01 to 2020-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828022005026/ghw-20211231.htm#1037905 Filing: 000162828022005026 The citation records this snapshot. The page link may show a newer release later.
2021 2021-01-01 – 2021-12-31	−USD 477.12 million Exact value Exact value: -477117000 USD 2021-01-01 – 2021-12-31: -477117000 USD Inspect Net Income Open source Share or cite Citation for Net Income · ESS Tech, Inc. · 2021-12-31 ESS Tech, Inc. (edgar:1819438) Net Income: -477117000 USD Concept: fundies:NetIncome Period: 2021-01-01 to 2021-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ANetIncome&period=2021-12-31&surface=latest&period_type=duration&start=2021-01-01&unit=USD&dimensions= Input fundies:NetIncome: -477117000 USD (2021-01-01 to 2021-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005933/ghw-20221231.htm#962784 Filing: 000162828023005933 The citation records this snapshot. The page link may show a newer release later.	−USD 51.85 million Exact value Exact value: -51849000 USD 2021-01-01 – 2021-12-31: -51849000 USD Inspect Operating Cash Flow Open source Share or cite Citation for Operating Cash Flow · ESS Tech, Inc. · 2021-12-31 ESS Tech, Inc. (edgar:1819438) Operating Cash Flow: -51849000 USD Concept: fundies:OperatingCashFlow Period: 2021-01-01 to 2021-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3AOperatingCashFlow&period=2021-12-31&surface=latest&period_type=duration&start=2021-01-01&unit=USD&dimensions= Input fundies:OperatingCashFlow: -51849000 USD (2021-01-01 to 2021-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005933/ghw-20221231.htm#997155 Filing: 000162828023005933 The citation records this snapshot. The page link may show a newer release later.	USD 2.77 million Exact value Exact value: 2767000 USD 2021-01-01 – 2021-12-31: 2767000 USD Inspect Capital Expenditure Open source Share or cite Citation for Capital Expenditure · ESS Tech, Inc. · 2021-12-31 ESS Tech, Inc. (edgar:1819438) Capital Expenditure: 2767000 USD Concept: fundies:CapitalExpenditure Period: 2021-01-01 to 2021-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ACapitalExpenditure&period=2021-12-31&surface=latest&period_type=duration&start=2021-01-01&unit=USD&dimensions= Input fundies:CapitalExpenditure: 2767000 USD (2021-01-01 to 2021-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005933/ghw-20221231.htm#1000241 Filing: 000162828023005933 The citation records this snapshot. The page link may show a newer release later.	−USD 54.62 million Calculation and evidence -51849000 − 2767000 USD Exact free cash flow: -54616000 USD 2021-01-01 – 2021-12-31: -51849000 USD · Inspect Operating Cash Flow · Source 2021-01-01 – 2021-12-31: 2767000 USD · Inspect Capital Expenditure · Source Share or cite Citation for Free cash flow · ESS Tech, Inc. · 2021-12-31 ESS Tech, Inc. (edgar:1819438) Free cash flow: -54616000 USD Concept: free-cash-flow Period: 2021-01-01 to 2021-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#cash-generation-title Computed: Operating cash flow minus capital expenditure Input fundies:OperatingCashFlow: -51849000 USD (2021-01-01 to 2021-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005933/ghw-20221231.htm#997155 Filing: 000162828023005933 Input fundies:CapitalExpenditure: 2767000 USD (2021-01-01 to 2021-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005933/ghw-20221231.htm#1000241 Filing: 000162828023005933 The citation records this snapshot. The page link may show a newer release later.
2022 2022-01-01 – 2022-12-31	−USD 77.97 million Exact value Exact value: -77969000 USD 2022-01-01 – 2022-12-31: -77969000 USD Inspect Net Income Open source Share or cite Citation for Net Income · ESS Tech, Inc. · 2022-12-31 ESS Tech, Inc. (edgar:1819438) Net Income: -77969000 USD Concept: fundies:NetIncome Period: 2022-01-01 to 2022-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ANetIncome&period=2022-12-31&surface=latest&period_type=duration&start=2022-01-01&unit=USD&dimensions= Input fundies:NetIncome: -77969000 USD (2022-01-01 to 2022-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828024011004/ghw-20231231.htm#781886 Filing: 000162828024011004 The citation records this snapshot. The page link may show a newer release later.	−USD 81.62 million Exact value Exact value: -81620000 USD 2022-01-01 – 2022-12-31: -81620000 USD Inspect Operating Cash Flow Open source Share or cite Citation for Operating Cash Flow · ESS Tech, Inc. · 2022-12-31 ESS Tech, Inc. (edgar:1819438) Operating Cash Flow: -81620000 USD Concept: fundies:OperatingCashFlow Period: 2022-01-01 to 2022-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3AOperatingCashFlow&period=2022-12-31&surface=latest&period_type=duration&start=2022-01-01&unit=USD&dimensions= Input fundies:OperatingCashFlow: -81620000 USD (2022-01-01 to 2022-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828024011004/ghw-20231231.htm#805572 Filing: 000162828024011004 The citation records this snapshot. The page link may show a newer release later.	USD 14.18 million Exact value Exact value: 14180000 USD 2022-01-01 – 2022-12-31: 14180000 USD Inspect Capital Expenditure Open source Share or cite Citation for Capital Expenditure · ESS Tech, Inc. · 2022-12-31 ESS Tech, Inc. (edgar:1819438) Capital Expenditure: 14180000 USD Concept: fundies:CapitalExpenditure Period: 2022-01-01 to 2022-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ACapitalExpenditure&period=2022-12-31&surface=latest&period_type=duration&start=2022-01-01&unit=USD&dimensions= Input fundies:CapitalExpenditure: 14180000 USD (2022-01-01 to 2022-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828024011004/ghw-20231231.htm#807820 Filing: 000162828024011004 The citation records this snapshot. The page link may show a newer release later.	−USD 95.8 million Calculation and evidence -81620000 − 14180000 USD Exact free cash flow: -95800000 USD 2022-01-01 – 2022-12-31: -81620000 USD · Inspect Operating Cash Flow · Source 2022-01-01 – 2022-12-31: 14180000 USD · Inspect Capital Expenditure · Source Share or cite Citation for Free cash flow · ESS Tech, Inc. · 2022-12-31 ESS Tech, Inc. (edgar:1819438) Free cash flow: -95800000 USD Concept: free-cash-flow Period: 2022-01-01 to 2022-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#cash-generation-title Computed: Operating cash flow minus capital expenditure Input fundies:OperatingCashFlow: -81620000 USD (2022-01-01 to 2022-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828024011004/ghw-20231231.htm#805572 Filing: 000162828024011004 Input fundies:CapitalExpenditure: 14180000 USD (2022-01-01 to 2022-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828024011004/ghw-20231231.htm#807820 Filing: 000162828024011004 The citation records this snapshot. The page link may show a newer release later.
2023 2023-01-01 – 2023-12-31	−USD 77.58 million Exact value Exact value: -77578000 USD 2023-01-01 – 2023-12-31: -77578000 USD Inspect Net Income Open source Share or cite Citation for Net Income · ESS Tech, Inc. · 2023-12-31 ESS Tech, Inc. (edgar:1819438) Net Income: -77578000 USD Concept: fundies:NetIncome Period: 2023-01-01 to 2023-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ANetIncome&period=2023-12-31&surface=latest&period_type=duration&start=2023-01-01&unit=USD&dimensions= Input fundies:NetIncome: -77578000 USD (2023-01-01 to 2023-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828025015649/ghw-20241231.htm#801494 Filing: 000162828025015649 The citation records this snapshot. The page link may show a newer release later.	−USD 54.9 million Exact value Exact value: -54896000 USD 2023-01-01 – 2023-12-31: -54896000 USD Inspect Operating Cash Flow Open source Share or cite Citation for Operating Cash Flow · ESS Tech, Inc. · 2023-12-31 ESS Tech, Inc. (edgar:1819438) Operating Cash Flow: -54896000 USD Concept: fundies:OperatingCashFlow Period: 2023-01-01 to 2023-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3AOperatingCashFlow&period=2023-12-31&surface=latest&period_type=duration&start=2023-01-01&unit=USD&dimensions= Input fundies:OperatingCashFlow: -54896000 USD (2023-01-01 to 2023-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828025015649/ghw-20241231.htm#825124 Filing: 000162828025015649 The citation records this snapshot. The page link may show a newer release later.	USD 5.79 million Exact value Exact value: 5790000 USD 2023-01-01 – 2023-12-31: 5790000 USD Inspect Capital Expenditure Open source Share or cite Citation for Capital Expenditure · ESS Tech, Inc. · 2023-12-31 ESS Tech, Inc. (edgar:1819438) Capital Expenditure: 5790000 USD Concept: fundies:CapitalExpenditure Period: 2023-01-01 to 2023-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ACapitalExpenditure&period=2023-12-31&surface=latest&period_type=duration&start=2023-01-01&unit=USD&dimensions= Input fundies:CapitalExpenditure: 5790000 USD (2023-01-01 to 2023-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828025015649/ghw-20241231.htm#827372 Filing: 000162828025015649 The citation records this snapshot. The page link may show a newer release later.	−USD 60.69 million Calculation and evidence -54896000 − 5790000 USD Exact free cash flow: -60686000 USD 2023-01-01 – 2023-12-31: -54896000 USD · Inspect Operating Cash Flow · Source 2023-01-01 – 2023-12-31: 5790000 USD · Inspect Capital Expenditure · Source Share or cite Citation for Free cash flow · ESS Tech, Inc. · 2023-12-31 ESS Tech, Inc. (edgar:1819438) Free cash flow: -60686000 USD Concept: free-cash-flow Period: 2023-01-01 to 2023-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#cash-generation-title Computed: Operating cash flow minus capital expenditure Input fundies:OperatingCashFlow: -54896000 USD (2023-01-01 to 2023-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828025015649/ghw-20241231.htm#825124 Filing: 000162828025015649 Input fundies:CapitalExpenditure: 5790000 USD (2023-01-01 to 2023-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000162828025015649/ghw-20241231.htm#827372 Filing: 000162828025015649 The citation records this snapshot. The page link may show a newer release later.
2024 2024-01-01 – 2024-12-31	−USD 86.22 million Exact value Exact value: -86222000 USD 2024-01-01 – 2024-12-31: -86222000 USD Inspect Net Income Open source Share or cite Citation for Net Income · ESS Tech, Inc. · 2024-12-31 ESS Tech, Inc. (edgar:1819438) Net Income: -86222000 USD Concept: fundies:NetIncome Period: 2024-01-01 to 2024-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ANetIncome&period=2024-12-31&surface=latest&period_type=duration&start=2024-01-01&unit=USD&dimensions= Input fundies:NetIncome: -86222000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#827296 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.	−USD 72.22 million Exact value Exact value: -72219000 USD 2024-01-01 – 2024-12-31: -72219000 USD Inspect Operating Cash Flow Open source Share or cite Citation for Operating Cash Flow · ESS Tech, Inc. · 2024-12-31 ESS Tech, Inc. (edgar:1819438) Operating Cash Flow: -72219000 USD Concept: fundies:OperatingCashFlow Period: 2024-01-01 to 2024-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3AOperatingCashFlow&period=2024-12-31&surface=latest&period_type=duration&start=2024-01-01&unit=USD&dimensions= Input fundies:OperatingCashFlow: -72219000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#850531 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.	USD 7.29 million Exact value Exact value: 7294000 USD 2024-01-01 – 2024-12-31: 7294000 USD Inspect Capital Expenditure Open source Share or cite Citation for Capital Expenditure · ESS Tech, Inc. · 2024-12-31 ESS Tech, Inc. (edgar:1819438) Capital Expenditure: 7294000 USD Concept: fundies:CapitalExpenditure Period: 2024-01-01 to 2024-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ACapitalExpenditure&period=2024-12-31&surface=latest&period_type=duration&start=2024-01-01&unit=USD&dimensions= Input fundies:CapitalExpenditure: 7294000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#852759 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.	−USD 79.51 million Calculation and evidence -72219000 − 7294000 USD Exact free cash flow: -79513000 USD 2024-01-01 – 2024-12-31: -72219000 USD · Inspect Operating Cash Flow · Source 2024-01-01 – 2024-12-31: 7294000 USD · Inspect Capital Expenditure · Source Share or cite Citation for Free cash flow · ESS Tech, Inc. · 2024-12-31 ESS Tech, Inc. (edgar:1819438) Free cash flow: -79513000 USD Concept: free-cash-flow Period: 2024-01-01 to 2024-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#cash-generation-title Computed: Operating cash flow minus capital expenditure Input fundies:OperatingCashFlow: -72219000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#850531 Filing: 000181943826000012 Input fundies:CapitalExpenditure: 7294000 USD (2024-01-01 to 2024-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#852759 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.
2025 2025-01-01 – 2025-12-31	−USD 63.4 million Exact value Exact value: -63400000 USD 2025-01-01 – 2025-12-31: -63400000 USD Inspect Net Income Open source Share or cite Citation for Net Income · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Net Income: -63400000 USD Concept: fundies:NetIncome Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ANetIncome&period=2025-12-31&surface=latest&period_type=duration&start=2025-01-01&unit=USD&dimensions= Input fundies:NetIncome: -63400000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#902140 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.	−USD 50.3 million Exact value Exact value: -50300000 USD 2025-01-01 – 2025-12-31: -50300000 USD Inspect Operating Cash Flow Open source Share or cite Citation for Operating Cash Flow · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Operating Cash Flow: -50300000 USD Concept: fundies:OperatingCashFlow Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3AOperatingCashFlow&period=2025-12-31&surface=latest&period_type=duration&start=2025-01-01&unit=USD&dimensions= Input fundies:OperatingCashFlow: -50300000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#902300 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.	USD 3.39 million Exact value Exact value: 3387000 USD 2025-01-01 – 2025-12-31: 3387000 USD Inspect Capital Expenditure Open source Share or cite Citation for Capital Expenditure · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Capital Expenditure: 3387000 USD Concept: fundies:CapitalExpenditure Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438/explain?concept=fundies%3ACapitalExpenditure&period=2025-12-31&surface=latest&period_type=duration&start=2025-01-01&unit=USD&dimensions= Input fundies:CapitalExpenditure: 3387000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#852169 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.	−USD 53.69 million Calculation and evidence -50300000 − 3387000 USD Exact free cash flow: -53687000 USD 2025-01-01 – 2025-12-31: -50300000 USD · Inspect Operating Cash Flow · Source 2025-01-01 – 2025-12-31: 3387000 USD · Inspect Capital Expenditure · Source Share or cite Citation for Free cash flow · ESS Tech, Inc. · 2025-12-31 ESS Tech, Inc. (edgar:1819438) Free cash flow: -53687000 USD Concept: free-cash-flow Period: 2025-01-01 to 2025-12-31 Values: Latest reported Published: 2026-11-02T07:45:36Z Snapshot: 965d01d08573aedac3f27ef3421e625479fdbf9a04731878e81b58a6c96bf1e5 Dimensions: Consolidated View: https://fundies.io/companies/edgar/1819438?view=overview&cadence=annual&surface=latest#cash-generation-title Computed: Operating cash flow minus capital expenditure Input fundies:OperatingCashFlow: -50300000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#902300 Filing: 000181943826000012 Input fundies:CapitalExpenditure: 3387000 USD (2025-01-01 to 2025-12-31) Dimensions: Consolidated Source: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000012/ghw-20251231.htm#852169 Filing: 000181943826000012 The citation records this snapshot. The page link may show a newer release later.

Capital expenditure uses the canonical mapped positive-spending convention. A missing, ambiguous, incompatible, or negative-sign input is left blank. Values use the latest reported version.

Dataset coverage and company identifiers

Coverage reflects filings processed into this Fundies dataset; it does not imply every source filing is loaded.

42 filings · 1,794 latest values · 1,794 originally reported values

Dataset published 2026-11-02. Source filing dates and reporting periods are shown separately.

Identifiers: 0001819438, 1819438, GWH, GWHT, edgar:1819438

Also known as ACON S2 ACQUISITION CORP., ACON S2 Acquisition Corp., ESS TECH, INC, ESS TECH, INC., ESS Tech, Inc.

ESS Tech, Inc.

Latest quarter

Revenue

Operating margin

Operating cash flow

Free cash flow

Reported share-count change

Trailing twelve months

Revenue

Net income

Operating cash flow

Company performance

What changed year over year

Revenue

Net income

Operating cash flow

Capital expenditure

Where revenue goes

2025 2025-01-01 – 2025-12-31

Cash

Share of revenue by period

Growth

Profit and cash

Balance sheet

Cash generation