 Mustang Bio, Inc. Mustang MBIO, a clinical-stage biopharmaceutical company focused on translating todays medical breakthroughs in cell and gene therapies into potential cures for hematologic cancers, solid tumors and rare genetic diseases, today announced that it is proposing to offer and sell, subject to market conditions, shares of its common stock in an underwritten public offering. Mustang expects to grant the underwriters a 30day option to purchase up to an additional 15 percent of the shares of common stock offered in the public offering. 