The performance quoted represents past performance and does not guarantee future results. Investment return and principal value of an investment will fluctuate so that an investor's shares, when sold or redeemed, may be worth more or less than the original cost. Current performance may be lower or higher than the performance quoted.

The Fund’s returns prior to September 17, 2018 are the returns of a predecessor fund, "BlackRock U.S. Government Bond Portfolio", that reorganized into the Fund on September 17, 2018. The predecessor fund had the same investment objectives, strategies and policies, portfolio management team and contractual arrangements, including the same contractual fees and expenses, as the Fund as of the date of the reorganization. As a result, the performance of the Fund would have been substantially similar to that of the predecessor fund.

Effective September 1, 2015, BlackRock Shares of the Fund were reclassified as Class K Shares of the Fund but remained inactive. The performance information for periods prior to January 25, 2018, the commencement of operations of the share class, shows the performance of the Fund’s Institutional Shares. The performance of this share class would be substantially similar to Institutional Shares because this share class and Institutional Shares invest in the same portfolio of securities and performance would only differ to the extent that this share class and Institutional Shares have different expenses.

See the Fund’s prospectus for more details.