; and (bb) purchasing for its own account investment securities under such limitations and restrictions as the Comptroller of the Currency, the Federal Deposit Insurance Corporation, and the Board of Governors of the Federal Reserve System may jointly prescribe, by regulation. (III) Prohibition on amount of investment In no event shall the total amount of the investment securities of any single obligor or maker, held by the association for its own account, exceed 10 percent of its capital stock actually paid in and unimpaired and 10 percent of its unimpaired surplus fund, except that such limitation shall not require any association to dispose of any securities lawfully held by it on August 23, 1935. (C) Prohibition against transactions involving structured or synthetic products A national banking association may not— (i) invest in a structured or synthetic product, a financial instrument in which a return is calculated based on the value of, or by reference to the performance of, a security, commodity, swap, other asset, or an entity, or any index or basket composed of securities, commodities, swaps, other assets, or entities, other than customarily determined interest rates; or (ii) otherwise engage in the business of receiving deposits or extending credit for transactions involving structured or synthetic products. . (d) Permitted Activities of Federal Savings Associations Section 5(c)(1) of the Home Owners' Loan Act ( 12 U.S.C. 1464(c)(1) ) is amended— (1) by striking subparagraph (Q)