---
schema_version: "secwatch.filing_event.v1"
accession: "0001819438-26-000011"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2026-03-05T23:59:59+00:00"
generated_at: "2026-05-15T19:49:22.191425+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# ESS Tech reports FY2025 net loss $63.4M, Adj. EBITDA -$44.3M, cash strengthened

## Summary
- Revenue of $1.6M; net loss improved to $63.4M from $86.2M in 2024; Adj. EBITDA -$44.3M vs -$71.3M.
- OpEx down 33% to $29.7M; cash & short-term investments $22M at year-end; raised $15M in Jan 2026.
- Leadership reset: Drew Buckley CEO, Kelly Goodman CSO/GC, Kate Suhadolnik CFO.
- Acquired VoltStorage IP; $9.9M military LDES contract; updated Google collaboration for Project New Horizon.
- Repaid 95% of $30M note tranche; drew second $10M tranche from YA II PN.

## SEC filing metadata
- accession: 0001819438-26-000011
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2026-03-05T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000011/0001819438-26-000011-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000011/wk-20260305.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001819438-26-000011
- JSON: https://secwatch.observer/filing/0001819438-26-000011.json
- Plain text: https://secwatch.observer/filing/0001819438-26-000011.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.