---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-028027"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2025-05-28T23:59:59+00:00"
generated_at: "2026-05-20T08:33:45.824857+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.95
calibrated_materiality_score: 0.95
confidence: "high"
source: SEC EDGAR
---

# ESS Tech warns of potential shutdown; issues WARN notices for Wilsonville site

## Summary
- As of May 27, 2025, ESS Tech has not raised capital needed to avoid or postpone a shutdown.
- Company issued WARN Act notices to employees and officials; shutdown effective May 30 if no financing.
- Continues to explore financing options; notes a utility project in contracting but not yet secured.
- Potential workforce actions if financing not obtained imminently.

## SEC filing metadata
- accession: 0001628280-25-028027
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2025-05-28T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.95
- calibrated_materiality_score: 0.95
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000162828025028027/0001628280-25-028027-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000162828025028027/wk-20250527.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-028027
- JSON: https://secwatch.observer/filing/0001628280-25-028027.json
- Plain text: https://secwatch.observer/filing/0001628280-25-028027.txt

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