{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-24-111500","form_type":"8-K","ticker":"MBIO","cik":"0001680048","company_name":"MUSTANG BIO, INC.","filed_at":"2024-10-25T23:59:59+00:00","discovered_at":"2026-05-14T18:03:09.204230+00:00","generated_at":"2026-05-30T10:04:59.759985+00:00","sec_items":["1.01","3.02","5.02","8.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"Mustang Bio raises $4M via warrant exercise; appoints David Jin to board","bullets":["Investor exercised 16,877,638 existing warrants at $0.237/share for ~$4M gross proceeds, before fees.","Issued new unregistered warrants to purchase up to 33,755,276 shares at $0.27/share; exercisable after stockholder approval.","Board expanded to seven; David Jin (CFO of majority owner Fortress Biotech) appointed as director.","Net proceeds to be used for working capital and general corporate purposes.","H.C. Wainwright acted as placement agent with 7% cash fee and 1,012,658 placement agent warrants at $0.2963/share."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-24-111500","json":"https://secwatch.observer/filing/0001104659-24-111500.json","markdown":"https://secwatch.observer/filing/0001104659-24-111500.md","text":"https://secwatch.observer/filing/0001104659-24-111500.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1680048/000110465924111500/0001104659-24-111500-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1680048/000110465924111500/tm2426843d1_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-30T10:04:59.759985+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":"0906d37ac4","claim":"David Jin was appointed as Director at MUSTANG BIO, INC..","evidence_excerpt":"On October 23, 2024, the Board of Directors (the “Board”) of the Company increased the number of directors on the Board from six to seven and appointed David Jin as a new member of the Board.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1680048/000110465924111500/0001104659-24-111500-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}