---
schema_version: "secwatch.filing_event.v1"
accession: "0001819438-25-000065"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2025-10-14T23:59:59+00:00"
generated_at: "2026-05-17T03:57:51.262977+00:00"
event_type: "debt"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# ESS Tech closes $40M note financing with Yorkville; warrant for 1.05M shares at $9.98

## Summary
- Unsecured promissory note of $40M in two tranches: $30M now, $10M upon ATM agreement with Yorkville Securities.
- Note bears 3% interest, matures Oct 14, 2026; proceeds for working capital and general corporate purposes.
- Issued warrant to Yorkville for up to 1,052,104 common shares at $9.98/share, exercisable for five years.
- Financing follows recent 50 MWh Salt River Project announcement; management cites strategic pivot to Energy Base.
- Company expects to use capital for execution on existing commitments and signing new long-duration storage contracts.

## SEC filing metadata
- accession: 0001819438-25-000065
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2025-10-14T23:59:59+00:00
- event_type: debt
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 2.03, 3.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000181943825000065/0001819438-25-000065-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000181943825000065/wk-20251014.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001819438-25-000065
- JSON: https://secwatch.observer/filing/0001819438-25-000065.json
- Plain text: https://secwatch.observer/filing/0001819438-25-000065.txt

## Key facts
- Debt Financings
  ESS Tech, Inc. incurred loan of up to $40 million with YA II PN, LTD. at 3% per annum maturing October 14, 2026.
  - Instrument: loan
  - Principal: up to $40 million
  - Counterparty: YA II PN, LTD.
  - Rate: 3% per annum
  - Maturity: October 14, 2026
  - Event: incurrence
  source text: On October 14, 2025, ESS Tech, Inc. (the “Company”) entered into an unsecured promissory note with YA II PN, LTD., an investment fund managed by Yorkville Advisors Global, L.P. (“Yorkville”) in the aggregate principal amount of up to $40 million
  evidence_url: https://www.sec.gov/Archives/edgar/data/1819438/000181943825000065/0001819438-25-000065-index.htm

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