{"schema_version":"secwatch.filing_event.v1","accession":"0001564590-21-047101","form_type":"8-K","ticker":"SANA","cik":"0001770121","company_name":"Sana Biotechnology, Inc.","filed_at":"2021-09-03T23:59:59+00:00","discovered_at":"2026-05-14T18:04:19.557144+00:00","generated_at":"2026-06-29T05:52:21.094572+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Director Geoffrey von Maltzahn resigns from Sana Biotechnology board","bullets":["Geoffrey von Maltzahn, Ph.D. resigned from the Board effective September 1, 2021.","Resignation is not due to any disagreement with Sana on operations, policies, or practices.","No replacement director has been named as of the filing date."],"urls":{"canonical":"https://secwatch.observer/filing/0001564590-21-047101","json":"https://secwatch.observer/filing/0001564590-21-047101.json","markdown":"https://secwatch.observer/filing/0001564590-21-047101.md","text":"https://secwatch.observer/filing/0001564590-21-047101.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1770121/000156459021047101/0001564590-21-047101-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1770121/000156459021047101/sana-8k_20210901.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-29T05:52:21.094572+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":"a643c3a1c3","claim":"Geoffrey von Maltzahn resigned as Director at Sana Biotechnology, Inc..","evidence_excerpt":"On September 1, 2021, Geoffrey von Maltzahn, Ph.D. notified Sana Biotechnology, Inc. (“Sana”) of his decision to resign from the Board of Directors of Sana (the “Board”), effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1770121/000156459021047101/0001564590-21-047101-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"}