In this final rule, the U.S. Small Business Administration (SBA) is revising the regulations for the Small Business Investment Company (SBIC) program concerning investments in passive businesses. SBICs are generally prohibited from investing in passive businesses under the Small Business Investment Act of 1958, as amended, as well as under SBIC program regulations. This final rule modifies an exception that allows an SBIC to make an investment in a passive small business that passes through the investment proceeds to one or more subsidiaries, each of which must be a non-passive small business. This modification allows an SBIC to structure an investment utilizing two levels of passive small businesses as pass-through entities under specific circumstances. The purpose of the modification is to place SBICs on a more equal footing with their non-SBIC counterparts in the venture capital and private equity sectors, in which investments structured with two passive levels are not uncommon. This final rule also includes several technical corrections. Specifically, the final rule updates the regulations by replacing obsolete Standard Industrial Classification (SIC) codes with their equivalents under the North American Industrial Classification System (NAICS); corrects erroneous paragraph cross-references; and modernizes the options for meeting the record preservation requirements by removing the reference to "microfilm."