{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-306786","form_type":"8-K","ticker":"STRO","cik":"0001382101","company_name":"SUTRO BIOPHARMA, INC.","filed_at":"2025-12-03T23:59:59+00:00","discovered_at":"2026-05-14T18:02:39.267470+00:00","generated_at":"2026-05-16T15:05:39.539246+00:00","sec_items":["3.03","5.03","8.01","9.01"],"event_type":"other_material","sentiment":"negative","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"Sutro Biopharma announces 1-for-10 reverse stock split effective Dec 3 to regain Nasdaq compliance","bullets":["Reverse stock split at 1-for-10, effective 12:01 a.m. ET on December 3, 2025.","Outstanding shares reduced from ~85.2M to ~8.52M; symbol STRO unchanged, new CUSIP 869367201.","Intended to regain Nasdaq minimum bid price compliance; approved by stockholders on June 6, 2025.","No fractional shares issued; any fractional interest rounded up to nearest whole share.","Proportionate adjustments to equity awards, exercise prices, and shares reserved under equity plans."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-306786","json":"https://secwatch.observer/filing/0001193125-25-306786.json","markdown":"https://secwatch.observer/filing/0001193125-25-306786.md","text":"https://secwatch.observer/filing/0001193125-25-306786.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1382101/000119312525306786/0001193125-25-306786-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1382101/000119312525306786/stro-20251201.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T15:05:39.539246+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":"c97633e2d655290243ebaf40cfadc0420c33dba3","claim":"SUTRO BIOPHARMA, INC.: Amendment to Restated Certificate of Incorporation to effect a 1-for-10 reverse stock split (effective 2025-12-03).","evidence_excerpt":"On December 2, 2025, Sutro Biopharma, Inc. (the “ Company ”) filed a Certificate of Amendment (the “ Amendment ”) to its Restated Certificate of Incorporation (the “ Certificate of Incorporation ”) with the Secretary of State of the State of Delaware to implement a 1-for-10 reverse stock split (the “ Reverse Stock Split ”) of the Company’s common stock, par value $0.001 per share (the “ Common Stock ”) to be effective as of 12:01 am Eastern time on December 3, 2025 (the “ Effective Time ”).","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/1382101/000119312525306786/0001193125-25-306786-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"charter amendment"},{"label":"Effective","value":"2025-12-03"}],"fact_type":"governance_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}