{"schema_version":"secwatch.filing_event.v1","accession":"0001558370-23-011376","form_type":"8-K","ticker":"MBIO","cik":"0001680048","company_name":"MUSTANG BIO, INC.","filed_at":"2023-06-23T23:59:59+00:00","discovered_at":"2026-05-14T18:03:40.010546+00:00","generated_at":"2026-06-13T18:09:41.019663+00:00","sec_items":["5.02","5.07","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.3,"calibrated_materiality_score":0.3,"confidence":"high","headline":"Mustang Bio stockholders approve ESPP amendment increasing shares to 466,666","bullets":["Stockholders approved ESPP amendment increasing shares from 66,666 to 466,666 and purchase right to 5,000.","Six directors elected: Weiss, Rosenwald, Herskowitz, Litchman, Chill, Zelefsky (all >10.1M votes for).","KPMG ratified as independent auditor for FY2023 (13.4M for, 68K against).","Advisory say-on-pay passed (10.3M for); frequency of vote set at every 3 years (9.9M votes).","Approximately 87% of votes represented at the meeting, constituting a quorum."],"urls":{"canonical":"https://secwatch.observer/filing/0001558370-23-011376","json":"https://secwatch.observer/filing/0001558370-23-011376.json","markdown":"https://secwatch.observer/filing/0001558370-23-011376.md","text":"https://secwatch.observer/filing/0001558370-23-011376.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1680048/000155837023011376/0001558370-23-011376-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1680048/000155837023011376/tmb-20230621x8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-13T18:09:41.019663+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":"021ef4653c1379b4eb8bd9f95ef12ea2a211cf7b","claim":"MUSTANG BIO, INC. shareholders approved Amendment to 2019 ESPP to increase shares available for issuance by 400,000 and increase purchase right limit to 5,000 shares at the 2023-06-21 meeting.","evidence_excerpt":"Proposal 5 The vote with respect to the approval of an amendment to Mustang’s ESPP were as follows: Total Votes For Total Votes Against Abstentions Broker Non-Votes 10,587,920 ​ 136,816 ​ 16,646 ​ 2,772,190","evidence_source":"SEC 8-K Item 5.07","evidence_url":"https://www.sec.gov/Archives/edgar/data/1680048/000155837023011376/0001558370-23-011376-index.htm","confidence":0.9,"family_label":"Shareholder Votes","details":[{"label":"Proposal","value":"equity plan"},{"label":"Outcome","value":"passed"},{"label":"Meeting","value":"2023-06-21"}],"fact_type":"shareholder_vote"},{"claim_id":"06cab65ce0dc39b85c03af8e68cb3ec82143c78c","claim":"MUSTANG BIO, INC. shareholders approved Ratification of KPMG LLP as independent registered public accounting firm for year ending December 31, 2023 at the 2023-06-21 meeting.","evidence_excerpt":"Proposal 2 The votes with respect to the ratification of KPMG LLP as Mustang’s independent registered accounting firm for the year ending December 31, 2023 were as follows: ​ ​ Total Votes For ​ Total Votes Against ​ Abstentions 13,416,567 67,990 29,015","evidence_source":"SEC 8-K Item 5.07","evidence_url":"https://www.sec.gov/Archives/edgar/data/1680048/000155837023011376/0001558370-23-011376-index.htm","confidence":0.9,"family_label":"Shareholder Votes","details":[{"label":"Proposal","value":"auditor ratification"},{"label":"Outcome","value":"passed"},{"label":"Meeting","value":"2023-06-21"}],"fact_type":"shareholder_vote"},{"claim_id":"1d6e3de8cd65591c4da58d4587e8900db439cff9","claim":"MUSTANG BIO, INC. shareholders approved Election of six directors to hold office until the 2024 annual meeting at the 2023-06-21 meeting.","evidence_excerpt":"Proposal 1 The votes with respect to the election of six directors to hold office until the 2024 annual meeting were as follows: Director For Withheld Broker Non-Votes Michael S. Weiss ​ 10,157,538 ​ 583,844 ​ 2,772,190 Lindsay A. Rosenwald, M.D. ​ 10,155,900 ​ 585,482 ​ 2,772,190 Neil Herskowitz ​ 10,319,736 ​ 421,646 ​ 2,772,190 Manuel Litchman, M.D. ​ 10,229,325 ​ 512,057 ​ 2,772,190 Adam Chill ​ 10,465,392 ​ 275,990 ​ 2,772,190 Michael Zelefsky, M.D. ​ 10,465,460 ​ 275,922 ​ 2,772,190","evidence_source":"SEC 8-K Item 5.07","evidence_url":"https://www.sec.gov/Archives/edgar/data/1680048/000155837023011376/0001558370-23-011376-index.htm","confidence":0.9,"family_label":"Shareholder Votes","details":[{"label":"Proposal","value":"director election"},{"label":"Outcome","value":"passed"},{"label":"Meeting","value":"2023-06-21"}],"fact_type":"shareholder_vote"},{"claim_id":"95bc897e86bf90c6bd70f2b72662ac3aada18e30","claim":"MUSTANG BIO, INC. shareholders approved Advisory vote on frequency of say-on-pay votes (every three years) at the 2023-06-21 meeting.","evidence_excerpt":"Proposal 4 The stockholders recommended a frequency of every three years for holding an advisory vote on the compensation of the Company’s named executive officers. The results of the advisory vote were as follows: ​ 1 Year 2 Years 3 Years Abstentions 765,968 ​ 22,813 ​ 9,934,636 ​ 17,965","evidence_source":"SEC 8-K Item 5.07","evidence_url":"https://www.sec.gov/Archives/edgar/data/1680048/000155837023011376/0001558370-23-011376-index.htm","confidence":0.9,"family_label":"Shareholder Votes","details":[{"label":"Proposal","value":"say on pay frequency"},{"label":"Outcome","value":"passed"},{"label":"Meeting","value":"2023-06-21"}],"fact_type":"shareholder_vote"},{"claim_id":"a2afaab5c7aef0366068f7518545fc3aada3a6bc","claim":"MUSTANG BIO, INC. shareholders approved Approval of compensation of named executive officers, advisory vote at the 2023-06-21 meeting.","evidence_excerpt":"Proposal 3 The votes with respect to the approval of the compensation of the named executive officers, in an advisory vote, were as follows: ​ Total Votes For Total Votes Against Abstentions Broker Non-Votes 10,275,332 ​ 415,125 ​ 50,925 ​ 2,772,190","evidence_source":"SEC 8-K Item 5.07","evidence_url":"https://www.sec.gov/Archives/edgar/data/1680048/000155837023011376/0001558370-23-011376-index.htm","confidence":0.9,"family_label":"Shareholder Votes","details":[{"label":"Proposal","value":"say on pay"},{"label":"Outcome","value":"passed"},{"label":"Meeting","value":"2023-06-21"}],"fact_type":"shareholder_vote"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}