{"schema_version":"secwatch.filing_event.v1","accession":"0001628280-26-003973","form_type":"8-K","ticker":"GWH","cik":"0001819438","company_name":"ESS Tech, Inc.","filed_at":"2026-01-29T23:59:59+00:00","discovered_at":"2026-05-14T18:02:36.324015+00:00","generated_at":"2026-05-16T06:31:30.976889+00:00","sec_items":["2.02","5.02","9.01"],"event_type":"earnings","sentiment":"negative","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"ESS Tech prelim FY2025 rev $1.6M, op loss $55M; CEO Buckley added to board","bullets":["Cash, equivalents, and short-term investments ~$22M at Dec 31, 2025, up $18.5M from Sep 30, 2025.","Revenue ~$1.6M, down $4.7M YoY due to wind-down of legacy contracts amid shift to Energy Base.","Operating loss ~$55M, improvement of $34.8M YoY reflecting ongoing cost discipline.","Repaid $24.4M (81%) of $30M promissory note; $5.6M outstanding; second tranche of $10M available until Feb 28, 2026.","CEO Drew Buckley elected to board (Class I), effective Jan 23, 2026; board size increased to eight."],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-26-003973","json":"https://secwatch.observer/filing/0001628280-26-003973.json","markdown":"https://secwatch.observer/filing/0001628280-26-003973.md","text":"https://secwatch.observer/filing/0001628280-26-003973.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1819438/000162828026003973/0001628280-26-003973-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1819438/000162828026003973/gwh-20260123.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T06:31:30.976889+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}