On March 11, 2022, Mr. Brian Achenbach notified Mustang Bio, Inc. (the 'Company') that he was resigning from his role as the Company's Senior Vice President of Finance & Corporate Controller, effective March 27, 2022, to pursue an opportunity outside of the Company. Mr. Achenbach did not resign as a result of any disagreement with the Company on any matter relating to the Company's operations, financial reporting or controls. The Company has entered into a consulting arrangement with Mr. Achenbach effective March 28, 2022.