secwatch.observer — SEC 8-K summary
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Issuer:     ESS Tech, Inc. (GWH)
CIK:        0001819438
Form:       8-K
Filed at:   2026-01-29T23:59:59+00:00
Accession:  0001628280-26-003973
Event type: earnings
Sentiment:  negative
Materiality: 0.60
Item codes: 2.02, 5.02, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

ESS Tech prelim FY2025 rev $1.6M, op loss $55M; CEO Buckley added to board
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- Cash, equivalents, and short-term investments ~$22M at Dec 31, 2025, up $18.5M from Sep 30, 2025.
- Revenue ~$1.6M, down $4.7M YoY due to wind-down of legacy contracts amid shift to Energy Base.
- Operating loss ~$55M, improvement of $34.8M YoY reflecting ongoing cost discipline.
- Repaid $24.4M (81%) of $30M promissory note; $5.6M outstanding; second tranche of $10M available until Feb 28, 2026.
- CEO Drew Buckley elected to board (Class I), effective Jan 23, 2026; board size increased to eight.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1819438/000162828026003973/0001628280-26-003973-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1819438/000162828026003973/gwh-20260123.htm
  HTML page:      https://secwatch.observer/filing/0001628280-26-003973

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer