Fidelity U.S. Bond Index Fund (FXNAX)

This fund typically allocates at least 80% of its capital to fixed-income securities represented in the Bloomberg U.S. Aggregate Bond Index. The portfolio manager utilizes statistical sampling strategies—considering factors like duration, maturity, interest rate sensitivity, bond structure, and credit quality—to closely track the index's returns while holding a more focused selection of securities. Furthermore, the fund invests in Fidelity's internal central funds.