{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-21-300138","form_type":"8-K","ticker":"GWH","cik":"0001819438","company_name":"ESS Tech, Inc.","filed_at":"2021-10-15T23:59:59+00:00","discovered_at":"2026-05-14T18:04:14.319907+00:00","generated_at":"2026-06-28T20:37:35.651574+00:00","sec_items":["1.01","2.01","5.02","3.02","3.01","3.03","5.01","5.03","5.05","5.06","7.01","9.01"],"event_type":"m_and_a","sentiment":"neutral","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"ESS Tech completes de-SPAC merger with ACON S2; begins trading on NYSE as GWH","bullets":["Merger closed Oct 8; ESS shares converted at 1.4711x; ~135M shares outstanding post-close.","PIPE financing raised $250M from 25M newly issued shares at $10 each.","New ESS common and warrants list on NYSE under GWH and GWH.W effective Oct 11.","Lock-up period of 180 days; early release if 20-day VWAP exceeds $12 within any 30-day window after day 150.","Up to 15.7M earnout shares contingently issuable based on milestones, representing ~11.6% dilution."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-21-300138","json":"https://secwatch.observer/filing/0001193125-21-300138.json","markdown":"https://secwatch.observer/filing/0001193125-21-300138.md","text":"https://secwatch.observer/filing/0001193125-21-300138.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1819438/000119312521300138/0001193125-21-300138-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1819438/000119312521300138/d231955d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-28T20:37:35.651574+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":"b25b7068e7","claim":"Alexi Wellman was appointed as director at ESS Tech, Inc..","evidence_excerpt":"the board of directors of New ESS (the “ Board ”) increased the size of the Board from eight to nine directors and appointed Alexi Wellman as an independent director, effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1819438/000119312521300138/0001193125-21-300138-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}