{"schema_version":"secwatch.filing_event.v1","accession":"0001628280-22-030772","form_type":"8-K","ticker":"GWH","cik":"0001819438","company_name":"ESS Tech, Inc.","filed_at":"2022-11-25T23:59:59+00:00","discovered_at":"2026-05-14T18:03:52.310179+00:00","generated_at":"2026-06-21T13:06:04.424588+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.3,"calibrated_materiality_score":0.3,"confidence":"high","headline":"Director Claudia Gast resigns from ESS Tech Board effective November 25, 2022","bullets":["Claudia Gast resigned from the Board of Directors and audit committee.","Resignation required by new employer's policy; no disagreement with ESS Tech.","No replacement announced; Board composition reduced."],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-22-030772","json":"https://secwatch.observer/filing/0001628280-22-030772.json","markdown":"https://secwatch.observer/filing/0001628280-22-030772.md","text":"https://secwatch.observer/filing/0001628280-22-030772.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1819438/000162828022030772/0001628280-22-030772-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1819438/000162828022030772/wk-20221125.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-21T13:06:04.424588+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":"1a03c3470c","claim":"Claudia Gast resigned as Director at ESS Tech, Inc..","evidence_excerpt":"On November 25, 2022, Claudia Gast resigned as a member of the Board of Directors","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1819438/000162828022030772/0001628280-22-030772-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"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"}