{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-129448","form_type":"8-K","ticker":"LYEL","cik":"0001806952","company_name":"Lyell Immunopharma, Inc.","filed_at":"2025-05-28T23:59:59+00:00","discovered_at":"2026-05-14T18:02:49.804170+00:00","generated_at":"2026-05-20T08:31:17.769981+00:00","sec_items":["3.03","9.01"],"event_type":"other_material","sentiment":"negative","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"Lyell Immunopharma announces 1-for-20 reverse stock split effective May 30, 2025","bullets":["Reverse split at 1-for-20 ratio; effective 5:00 p.m. ET on May 30, 2025.","Common stock begins split-adjusted trading on Nasdaq June 2, 2025.","Proportionate adjustments to stock options, RSUs, and shares reserved under equity plans.","Pre-split shares outstanding: ~296.2M; post-split: ~14.8M (subject to fractional cash-out).","New CUSIP number: 55083R203; no change in par value or proportional ownership."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-129448","json":"https://secwatch.observer/filing/0001193125-25-129448.json","markdown":"https://secwatch.observer/filing/0001193125-25-129448.md","text":"https://secwatch.observer/filing/0001193125-25-129448.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1806952/000119312525129448/0001193125-25-129448-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1806952/000119312525129448/d944707d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-20T08:31:17.769981+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}