12 C.F.R. § 347.108 – Portfolio investments.

(a) Portfolio investments. If a bank, directly or indirectly, acquires or holds an equity interest in a foreign organization as a portfolio investment and the foreign organization is not controlled, directly or indirectly, by the bank or its affiliates:
1. (1) No more than 10 percent of either the consolidated assets or revenues of the foreign organization may be attributable to activities that are not permissible under § 347.105(b); and
2. (2) Any loans or extensions of credit made by the bank and its affiliates to the foreign organization must be on substantially the same terms, including interest rates and collateral, as those prevailing at the same time for comparable transactions between the bank or its affiliates and nonaffiliated organizations.
(b) Portfolio investment defined. For purposes of this section, the term “portfolio investment” means an investment in an organization in which less than 20 percent of the voting equity interests, in the aggregate, are directly or indirectly held by a bank or its affiliates.