{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-24-119771","form_type":"8-K","ticker":null,"cik":"0001656634","company_name":"Gritstone bio, Inc.","filed_at":"2024-04-29T23:59:59+00:00","discovered_at":"2026-05-14T18:03:19.457074+00:00","generated_at":"2026-06-03T05:37:29.969678+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Gritstone bio director Steve Krognes not standing for re-election; Stephen Webster appointed","bullets":["Steve Krognes to not stand for re-election at June 17, 2024 annual meeting; no disagreement cited.","Stephen Webster appointed as Class I director effective April 26, 2024, term expiring 2025.","Webster joins Audit and Compensation Committees; to become Audit Chair after Krognes' term ends.","Webster receives standard director compensation: $40k cash retainer plus option for 103,600 shares vesting over 3 years."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-24-119771","json":"https://secwatch.observer/filing/0001193125-24-119771.json","markdown":"https://secwatch.observer/filing/0001193125-24-119771.md","text":"https://secwatch.observer/filing/0001193125-24-119771.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1656634/000119312524119771/0001193125-24-119771-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1656634/000119312524119771/d782673d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-03T05:37:29.969678+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":"699484c55b","claim":"Stephen W. Webster was appointed as Director at Gritstone bio, Inc..","evidence_excerpt":"On April 26, 2024, upon the recommendation of the Nominating and Corporate Governance Committee of the Board, the Board appointed Stephen W. Webster as a director of the Company, effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1656634/000119312524119771/0001193125-24-119771-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"}