58 Pa. Code § 165.56
Each person for whom stock, or any interest therein, is to be held by a registered stockholder shall be required to file an affidavit in duplicate setting forth the information required under § 165.51(a) (relating to individual stockholders-voting and nonvoting stock). To each of such affidavits shall be annexed, and expressly stated in such affidavit to be deemed a part thereof, a true and complete copy of all the terms of the agreement pursuant to which stock is to be so held by the registered stockholder, including a detailed statement of the interest therein of each person who is to have any interest therein. "Interest" as used in this section shall be construed and applied as the "holding of an interest" as defined in § 165.31 (relating to occupational and participation licenses).
58 Pa. Code § 165.56
This section cited in 58 Pa. Code § 165.13 (relating to filing of information concerning stock transfers); 58 Pa. Code § 165.57 (relating to beneficial ownership of stock by minors, incompetents and unascertained beneficiaries); and 58 Pa. Code § 165.58 (relating to change of status of affiants who are beneficial owners).