{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-220432","form_type":"8-K","ticker":"MBX","cik":"0001776111","company_name":"MBX Biosciences, Inc.","filed_at":"2025-09-26T23:59:59+00:00","discovered_at":"2026-05-14T18:02:44.955452+00:00","generated_at":"2026-05-17T05:34:53.673953+00:00","sec_items":["1.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"MBX Biosciences raises $187.5M via public offering of 11.1M shares at $18.00","bullets":["Offering of 11,108,055 shares at $18.00 per share; underwriters have 30-day option for up to 1,666,208 additional shares.","Net proceeds of $187.5M; funds to advance three clinical-stage programs plus discovery R&D and corporate purposes.","Underwriting agreement with J.P. Morgan and Jefferies as representatives; offering closed September 26, 2025.","Registration statements on Form S-1 and S-1MEF became effective September 24, 2025."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-220432","json":"https://secwatch.observer/filing/0001193125-25-220432.json","markdown":"https://secwatch.observer/filing/0001193125-25-220432.md","text":"https://secwatch.observer/filing/0001193125-25-220432.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1776111/000119312525220432/0001193125-25-220432-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1776111/000119312525220432/mbx-20250924.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T05:34:53.673953+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"}