{"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","discovered_at":"2026-05-14T18:02:40.592167+00:00","generated_at":"2026-05-17T03:57:51.262977+00:00","sec_items":["1.01","2.03","3.02","9.01"],"event_type":"debt","sentiment":"positive","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"ESS Tech closes $40M note financing with Yorkville; warrant for 1.05M shares at $9.98","bullets":["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."],"urls":{"canonical":"https://secwatch.observer/filing/0001819438-25-000065","json":"https://secwatch.observer/filing/0001819438-25-000065.json","markdown":"https://secwatch.observer/filing/0001819438-25-000065.md","text":"https://secwatch.observer/filing/0001819438-25-000065.txt","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"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T03:57:51.262977+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"8c4721cbe50b9b1a24612789836a341e35424c1d","claim":"ESS Tech, Inc. incurred loan of up to $40 million with YA II PN, LTD. at 3% per annum maturing October 14, 2026.","evidence_excerpt":"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_source":"SEC 8-K Item 2.03/2.04","evidence_url":"https://www.sec.gov/Archives/edgar/data/1819438/000181943825000065/0001819438-25-000065-index.htm","confidence":0.9,"family_label":"Debt Financings","details":[{"label":"Instrument","value":"loan"},{"label":"Principal","value":"up to $40 million"},{"label":"Counterparty","value":"YA II PN, LTD."},{"label":"Rate","value":"3% per annum"},{"label":"Maturity","value":"October 14, 2026"},{"label":"Event","value":"incurrence"}],"fact_type":"debt_financing"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}