Supplement to the

Fidelity® Total Bond Fund

Class A, Class M, Class C, Class I, and Class Z

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.
• Investing up to 20% of assets in lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds).
• Managing the fund to have similar overall interest rate risk to the Bloomberg U.S. Aggregate Bond Index.

ATB-SUSTK-0225-106 1.9880630.106 February 1, 2025

Supplement to the

Fidelity® Total Bond 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.
• Investing up to 20% of assets in lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds).
• Managing the fund to have similar overall interest rate risk to the Bloomberg U.S. Aggregate Bond Index.

TBD-SUSTK-0225-102 1.9910128.102 February 1, 2025