; (B) any bank holding company, any savings and loan holding company, and any subsidiary of any of such companies; (C) any nonbank financial company (as defined in section 102(a)(4) of the Dodd-Frank Wall Street Reform and Consumer Protection Act ( 12 U.S.C. 5311(a)(4) )) that is supervised by the Board of Governors of the Federal Reserve System under section 113 of the Dodd-Frank Wall Street Reform and Consumer Protection Act ( 12 U.S.C. 5323 ), including any intermediate holding company supervised as a nonbank financial company, and any subsidiary of such a nonbank financial company; and (D) any issuer that is sponsored by 1 or more eligible issuers for the sole purpose of issuing covered bonds on a pooled basis. (10) Oversight program The term oversight program means the covered bond regulatory oversight program established under section 342(a). (11) Secretary The term Secretary means the Secretary of the Department of the Treasury. (12) Substitute asset The term substitute asset means— (A) cash; (B) any direct obligation of the United States Government, and any security or other obligation whose full principal and interest are insured or guaranteed by the full faith and credit of the United States Government; (C) any direct obligation of a United States Government corporation or Government-sponsored enterprise of the highest credit quality, and any other security or other obligation of the highest credit quality whose full principal and interest are insured or guaranteed by such corporation or enterprise, except that the outstanding principal amount of these obligations in any cover pool may not exceed an amount equal to 20 percent of the outstanding principal amount of all assets in the cover pool without the approval of the applicable covered bond regulator; (D) any overnight investment in Federal funds; (E) any other substitute asset designated by the Secretary, by rule and in consultation with the covered bond regulators