{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-23-021612","form_type":"8-K","ticker":"SPRO","cik":"0001701108","company_name":"Spero Therapeutics, Inc.","filed_at":"2023-02-01T23:59:59+00:00","discovered_at":"2026-05-14T18:03:46.191963+00:00","generated_at":"2026-06-20T03:56:02.689118+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.4,"calibrated_materiality_score":0.4,"confidence":"high","headline":"Spero Therapeutics names Timothy Keutzer Chief Operating Officer effective Feb 1, 2023","bullets":["Timothy Keutzer, previously Chief Development Officer, appointed COO effective February 1, 2023.","Base salary set at $459,000; annual cash bonus target of up to 40% of base salary.","Grant of 4-year vesting RSUs worth $500,000 on effective date.","Severance: 9 months salary without Cause/Good Reason; on change of control, 12 months salary plus equity acceleration."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-23-021612","json":"https://secwatch.observer/filing/0001193125-23-021612.json","markdown":"https://secwatch.observer/filing/0001193125-23-021612.md","text":"https://secwatch.observer/filing/0001193125-23-021612.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1701108/000119312523021612/0001193125-23-021612-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1701108/000119312523021612/d455024d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-20T03:56:02.689118+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":"235051176e","claim":"Timothy Keutzer was appointed as Chief Operating Officer at Spero Therapeutics, Inc..","evidence_excerpt":"On January 30, 2023, the Board of Directors (the “Board”) of Spero Therapeutics, Inc. (the “Company”) appointed Timothy Keutzer as the Company’s Chief Operating Officer, effective as of February 1, 2023","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1701108/000119312523021612/0001193125-23-021612-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Chief Operating Officer"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}