---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-24-010886"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2024-03-13T23:59:59+00:00"
generated_at: "2026-06-04T22:28:41.123167+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# ESS Tech reports record FY 2023 revenue of $7.5M, lowers Q4 adj. EBITDA loss >50% YoY

## Summary
- Q4 & FY 2023 revenue: $7.5M (record); cash & short-term investments >$100M exiting 2023.
- Q4 adjusted EBITDA loss cut by more than half YoY; EW manufacturing cost reduced ~60% in 2023.
- Delivered first Energy Warehouses to Honeywell; first Energy Center lifted, slated for PGE in 2024.
- Guides 40% EW cost reduction in 2024 to achieve non-GAAP gross margin profitability.

## SEC filing metadata
- accession: 0001628280-24-010886
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2024-03-13T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000162828024010886/0001628280-24-010886-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000162828024010886/wk-20240313.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-24-010886
- JSON: https://secwatch.observer/filing/0001628280-24-010886.json
- Plain text: https://secwatch.observer/filing/0001628280-24-010886.txt

## Key facts
- Earnings Releases
  ESS Tech, Inc. reported fourth quarter and full year ended December 31, 2023 results: revenue $7.5M for FY 2023.
  - Period: fourth quarter and full year ended December 31, 2023
  - Revenue: $7.5M for FY 2023
  - Result: reported results
  source text: ESS Tech, Inc. (“ESS,” “ESS, Inc.” or the “Company”) (NYSE:GWH), a leading manufacturer of long-duration energy storage systems (LDES) for commercial and utility-scale applications, today announced financial results for its fourth quarter and full year ended December 31, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1819438/000162828024010886/0001628280-24-010886-index.htm

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