---
schema_version: "secwatch.filing_event.v1"
accession: "0001819438-26-000049"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2026-06-18T21:27:54+00:00"
generated_at: "2026-06-18T21:31:12.504184+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Board member Rich Hossfeld resigns; Raffi Garabedian takes audit committee seat.

## Summary
- Rich Hossfeld resigned from ESS Tech board and Audit Committee effective June 12, 2026.
- Raffi Garabedian appointed to the Audit Committee effective June 12, 2026.
- Resignation not due to any disagreement with company on operations, policies, or practices.
- Company thanked Hossfeld for years of service and contributions.

## SEC filing metadata
- accession: 0001819438-26-000049
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2026-06-18T21:27:54+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000049/0001819438-26-000049-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000049/wk-20260612.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001819438-26-000049
- JSON: https://secwatch.observer/filing/0001819438-26-000049.json
- Plain text: https://secwatch.observer/filing/0001819438-26-000049.txt

## Key facts
- Executive change
  Rich Hossfeld resigned as Director at ESS Tech, Inc..
  - Action: resigned
  - Role: Director
  source text: On June 12, 2026, Rich Hossfeld notified ESS Tech, Inc. (the “Company”) that he is resigning from the board of directors (the “Board”) of the Company and Audit Committee of the Board (the “Audit Committee”), effective as of June 12, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000049/0001819438-26-000049-index.htm
- Executive change
  Raffi Garabedian was appointed as Audit Committee Member at ESS Tech, Inc..
  - Action: appointed
  - Role: Audit Committee Member
  source text: Raffi Garabedian will replace Mr. Hossfeld on the Audit Committee, effective as of June 12, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1819438/000181943826000049/0001819438-26-000049-index.htm

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