BlackRock U.S. Government Bond Portfolio Investor A Shares (BlackRock Impact Mortgage Fund) 

The investment seeks to maximize total return, consistent with income generation and prudent investment management, while investing in a portfolio of fixed income securities that fund management views as generating positive social and/or environmental impacts. The fund seeks to achieve its objective by investing at least 80% of its net assets, plus any borrowings for investment purposes, in mortgage-backed and other mortgage-related securities that are issued or guaranteed by the U.S. government and its agencies.