No licensed manager of a professional boxer or professional mixed martial artist shall sell, assign, transfer, or in any way encumber or attempt to sell, assign, transfer, or in any way encumber any interest, in whole or in part, which he shall hold in any contract for the services of such boxer or mixed martial artist without notice to and written consent of such boxer or mixed martial artist and approval by the Commission.
N.Y. Comp. Codes R. & Regs. Tit. 19 § 208.20