The Board of Governors of the Federal Reserve System and the Secretary of the Treasury jointly adopt this final rule governing merchant banking investments made by financial holding companies. The rule implements provisions of the Gramm-Leach-Bliley Act that permit financial holding companies to make investments as part of a bona fide securities underwriting or merchant or investment banking activity. The Board and the Secretary have incorporated a number of amendments to the final rule to address issues raised by public commenters, to reduce potential regulatory burdens, and to clarify the application of the rule. These changes include expanding the definition of "securities affiliate" to include a department or division of a bank registered as a municipal securities dealer; modifying the provisions defining prohibited routine management and operation of portfolio companies; adopting a sunset provision for the investment thresholds under the interim rule and eliminating the dollar-based threshold for the review of a financial holding company's merchant banking activities; streamlining the rule's reporting and recordkeeping requirements; broadening the definition of "private equity" funds and clarifying the rule's application to such funds; and adopting several safe-harbors to the presumptions in the rule governing the definition of affiliate for purposes of sections 23A and 23B of the Federal Reserve Act.