{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-26-374788","form_type":"8-K","ticker":"SPRO","cik":"0001701108","company_name":"Spero Therapeutics, Inc.","filed_at":"2026-08-28T21:25:56+00:00","discovered_at":"2026-08-28T21:28:06.614801+00:00","generated_at":"2026-08-28T21:28:10.874276+00:00","sec_items":["1.01","8.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"Spero enters $100M ATM facility with Jefferies, terminates Cantor ATM","bullets":["Sale Agreement with Jefferies LLC enables up to $100M of common stock in at-the-market offerings once S-3 is effective.","Registration statement on Form S-3 for up to $300M in securities filed Aug 28, 2026; not yet effective, no sales permitted until then.","Jefferies to receive up to 3.0% of gross proceeds for shares sold under the agreement.","Terminated Cantor Fitzgerald ATM agreement effective Aug 28, 2026; no shares sold under it in FY2024 or FY2025, no penalties incurred."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-374788","json":"https://secwatch.observer/filing/0001193125-26-374788.json","markdown":"https://secwatch.observer/filing/0001193125-26-374788.md","text":"https://secwatch.observer/filing/0001193125-26-374788.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1701108/000119312526374788/0001193125-26-374788-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1701108/000119312526374788/d145223d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-08-28T21:28:10.874276+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"}