{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-24-216310","form_type":"8-K","ticker":"SPRO","cik":"0001701108","company_name":"Spero Therapeutics, Inc.","filed_at":"2024-09-10T23:59:59+00:00","discovered_at":"2026-05-14T18:03:14.162989+00:00","generated_at":"2026-05-31T05:39:57.997406+00:00","sec_items":["7.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.05,"calibrated_materiality_score":0.05,"confidence":"low","headline":"Spero Therapeutics updates investor presentation; no material new financial or operational data disclosed","bullets":["Filed an updated investor presentation dated September 9, 2024, under Regulation FD.","Presentation available on Spero's IR website; company disclaims obligation to update after that date.","No specific financial metrics, pipeline updates, or guidance changes were provided in the filing."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-24-216310","json":"https://secwatch.observer/filing/0001193125-24-216310.json","markdown":"https://secwatch.observer/filing/0001193125-24-216310.md","text":"https://secwatch.observer/filing/0001193125-24-216310.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1701108/000119312524216310/0001193125-24-216310-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1701108/000119312524216310/d819424d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-31T05:39:57.997406+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"}