---
schema_version: "secwatch.filing_event.v1"
accession: "0001819438-25-000079"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2025-12-05T23:59:59+00:00"
generated_at: "2026-05-16T14:18:36.184812+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# ESS Tech amends Yorkville note: extends second tranche deadline to Feb 2026, lowers principal condition

## Summary
- Second tranche deadline extended from Dec 12, 2025 to no later than Feb 28, 2026.
- Condition for second tranche: principal outstanding under Tranche One must be ≤ $7M (down from $20M).
- Company must enter ATM sales agreement with Yorkville Securities, with Yorkville receiving ≥60% of commissions.
- Second tranche amount remains $10M less original issue discount.

## SEC filing metadata
- accession: 0001819438-25-000079
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2025-12-05T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000181943825000079/0001819438-25-000079-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000181943825000079/wk-20251204.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001819438-25-000079
- JSON: https://secwatch.observer/filing/0001819438-25-000079.json
- Plain text: https://secwatch.observer/filing/0001819438-25-000079.txt

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