Assignments of securities registered in the titles, without the names of the fiduciaries, for example, "Trustees of the George E. White Memorial Scholarship Fund under deed of trust dated 11/10/40, executed by John W. White," must be supported by proof that the assignors are the qualified and acting trustees of the designated trust estate, unless they are empowered to act as a unit in which case the provisions of § 306.76 shall apply. (Form PD 2446 may be used to furnish proof of incumbency of fiduciaries.) Assignments by fiduciaries of securities not registered or assigned in such manner as to show that they belong to the estate for which the assignors are acting must also be supported by evidence that the estate is entitled to the securities.
31 C.F.R. §306.75