15 Pa. C.S. § 5587
A nonprofit corporation shall invest the assets of a trust or fund in a common trust fund authorized by this subchapter by adding those assets thereto, and by apportioning a participation therein to the trust or fund in the proportion that the assets of the trust or fund added thereto bears to the aggregate value of all the assets of the common trust fund at the time of the investment, including in those assets the assets of the trust or fund so added. The withdrawal of a participation from the common trust fund shall be on a basis of its proportionate interest in the aggregate value of all the assets of the common trust fund at the time of the withdrawal. The participating interest of any trust or fund in the common trust fund may from time to time be withdrawn, in whole or in part, by the corporation. Upon a withdrawal, the corporation may make distribution in cash, or ratably in kind, or partly in cash and partly in kind. Participations in the common trust funds shall not be sold by the corporation to any other corporation or person, but this sentence shall not prevent a corporate trustee designated under section 5585 (relating to establishment or use of common trust funds authorized) from investing the assets of the common trust fund in any collective investment fund established and maintained by it in accordance with law and to which the assets comprising the common trust fund are eligible contributions.
15 Pa.C.S. § 5587