12 C.F.R. § 44.6
(a) Permitted trading in domestic government obligations. The prohibition contained in § 44.3(a) does not apply to the purchase or sale by a banking entity of a financial instrument that is:
(b) Permitted trading in foreign government obligations - (1) Affiliates of foreign banking entities in the United States. The prohibition contained in § 44.3(a) does not apply to the purchase or sale of a financial instrument that is an obligation of, or issued or guaranteed by, a foreign sovereign (including any multinational central bank of which the foreign sovereign is a member), or any agency or political subdivision of such foreign sovereign, by a banking entity, so long as:
(2) Foreign affiliates of a U.S. banking entity. The prohibition contained in § 44.3(a) does not apply to the purchase or sale of a financial instrument that is an obligation of, or issued or guaranteed by, a foreign sovereign (including any multinational central bank of which the foreign sovereign is a member), or any agency or political subdivision of that foreign sovereign, by a foreign entity that is owned or controlled by a banking entity organized or established under the laws of the United States or any State, so long as:
(c) Permitted trading on behalf of customers - (1) Fiduciary transactions. The prohibition contained in § 44.3(a) does not apply to the purchase or sale of financial instruments by a banking entity acting as trustee or in a similar fiduciary capacity, so long as:
(d) Permitted trading by a regulated insurance company. The prohibition contained in § 44.3(a) does not apply to the purchase or sale of financial instruments by a banking entity that is an insurance company or an affiliate of an insurance company if:
(1) The insurance company or its affiliate purchases or sells the financial instruments solely for:
(e) Permitted trading activities of foreign banking entities.
(1) The prohibition contained in § 44.3(a) does not apply to the purchase or sale of financial instruments by a banking entity if:
(2) A purchase or sale of financial instruments by a banking entity is made pursuant to paragraph (9) or (13) of section 4(c) of the BHC Act for purposes of paragraph (e)(1)(ii) of this section only if:
(ii)
(B) With respect to a banking entity that is not a foreign banking organization, the banking entity is not organized under the laws of the United States or of any State and the banking entity, on a fully-consolidated basis, meets at least two of the following requirements:
(1) Total assets of the banking entity held outside of the United States exceed total assets of the banking entity held in the United States;
(2) Total revenues derived from the business of the banking entity outside of the United States exceed total revenues derived from the business of the banking entity in the United States; or
(3) Total net income derived from the business of the banking entity outside of the United States exceeds total net income derived from the business of the banking entity in the United States.
(3) A purchase or sale by a banking entity is permitted for purposes of this paragraph (e) if:
(v) The purchase or sale is not conducted with or through any U.S. entity, other than:
(6) For purposes of this paragraph (e), unaffiliated market intermediary means an unaffiliated entity, acting as an intermediary, that is: