Supplement to the

Fidelity® SAI Total Bond Fund

October 29, 2022

Summary Prospectus

Michael Weaver no longer serves as a Co-Portfolio Manager of the fund.

The following information supplements information found in the "Fund Summary" section under the "Portfolio Manager(s)" heading.

Benjamin Harrison (Co-Portfolio Manager) has managed the fund since 2023.

STB-SUSTK-0623-100 1.9910132.100 June 7, 2023