Supplement to the

Fidelity® Total Bond K6 Fund

October 30, 2024

Summary Prospectus

The following information replaces similar information found in the "Fund Summary" section under the "Principal Investment Strategies" heading.

• Allocating assets across investment-grade, high yield, and emerging markets debt securities. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics.

TBDK6-SUSTK-0225-101 1.9916331.101 February 1, 2025