{"schema_version":"secwatch.filing_event.v1","accession":"0001628280-26-063369","form_type":"8-K","ticker":"SNTI","cik":"0001854270","company_name":"Senti Biosciences, Inc.","filed_at":"2026-09-24T20:03:57+00:00","discovered_at":"2026-09-24T20:05:00.184915+00:00","generated_at":"2026-09-24T20:05:31.146531+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Senti Biosciences board member Brenda Cooperstone resigns effective immediately","bullets":["Brenda Cooperstone, Ph.D. resigned from the Board on September 23, 2026, effective immediately.","Cooperstone also stepped down as Chair of the Compensation Committee, effective immediately.","Resignation was not due to any disagreement with Senti on operations, policies, or practices."],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-26-063369","json":"https://secwatch.observer/filing/0001628280-26-063369.json","markdown":"https://secwatch.observer/filing/0001628280-26-063369.md","text":"https://secwatch.observer/filing/0001628280-26-063369.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1854270/000162828026063369/0001628280-26-063369-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1854270/000162828026063369/snti-20260923.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-09-24T20:05:31.146531+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":"a579910928","claim":"Brenda Cooperstone resigned as Director at Senti Biosciences, Inc..","evidence_excerpt":"On September 23, 2026, Brenda Cooperstone, Ph.D., notified the Board of Directors (the \"Board\") of Senti Biosciences Holdings, Inc. (the \"Company\") of her decision to resign from the Board, effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1854270/000162828026063369/0001628280-26-063369-index.htm","confidence":1.0,"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"}