12 C.F.R. § 225.21
(a) Prohibited nonbanking activities and acquisitions. Except as provided in § 225.22 of this subpart, a bank holding company or a subsidiary may not engage in, or acquire or control, directly or indirectly, voting securities or assets of a company engaged in, any activity other than:
(b) Exempt bank holding companies. The following bank holding companies are exempt from the provisions of this subpart:
(4) Companies granted exemption on other grounds. Any company that acquired control of a bank before December 10, 1982, without the Board's prior approval under section 3 of the BHC Act, on the basis of a narrow interpretation of the term demand deposit or commercial loan, if the Board has determined that: