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Fidelity U.S. Bond Index Fund

FXNAX
Intermediate Core Bond
Fidelity

The fund normally invests at least 80% of the fund's assets in bonds included in the Bloomberg U.S. Aggregate Bond Index. Its manager uses statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. Aggregate Bond Index using a smaller number of securities. The fund invests in Fidelity's central funds.

Expense Ratio
0.00%
What's an expense ratio?
5-Year Return
+0.21%
How to read fund performance
Volatility
+4.08%
What is volatility?
Total Assets
$69.0K
Performance History
1-Year Return+5.24%
3-Year Return+3.96%
5-Year Return+0.21%
10-Year Return+20.46%
Fund Details
Minimum Investment$0
Fund ManagerFidelity Management Team
Inception Date2011-05-03
Assets Under Management$68,962 M
Data Last UpdatedApr 13, 2026
How to Invest in FXNAX

Buy directly from Fidelity

Fidelity funds can be purchased directly through their website, typically with no transaction fee.0

Visit Fidelity.com

Affiliate disclosure: Some links on this page are affiliate links. If you open an account through a link on this site, we may earn a commission at no additional cost to you. This does not influence our fund data or analysis. Learn more.

Investment Calculators

Fee Impact Calculator

Fee Impact Calculator
See how fees would impact your investment in Fidelity U.S. Bond Index Fund
Calculating for:
FXNAX

Fidelity U.S. Bond Index Fund

Pre-filled with FXNAX's historical average return

FXNAX's actual expense ratio

Comparison fund (e.g., actively managed)

Results
Future value after 30 years
Enter your values and click “Calculate Impact” to see results

Note: This calculator uses simplified assumptions based on FXNAX's historical performance. It does not account for taxes, inflation, or varying returns. Past performance does not guarantee future results.

Return Simulator

Return Projection Simulator
Project your portfolio's future value with Fidelity U.S. Bond Index Fund
Projecting for:
FXNAX

Fidelity U.S. Bond Index Fund

How much are you investing today?

How much will you contribute each month?

How long will you invest for?

Pre-filled with FXNAX's historical average return

Projection Results
Estimated portfolio value after 30 years
Enter your parameters and click “Simulate Returns” to see projections

Important: This projection uses simplified assumptions based on FXNAX's historical performance. Actual investment returns vary year-to-year. Past performance does not guarantee future results. This tool is for educational purposes only.

Top Holdings

UST10YU.S. Treasury 10Y Note
1200.00%
FNMAFannie Mae MBS
850.00%
UST2YU.S. Treasury 2Y Note
600.00%

Top holdings shown as percentage of fund assets. Data sourced from fund filings. Holdings may change over time.

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Expense Ratio0.00%
5-Year Return+0.04%
VBTLX
Vanguard

Vanguard Total Bond Market Inde

Expense Ratio0.00%
5-Year Return+0.16%
DODIX
Dodge & Cox

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Expense Ratio0.00%
5-Year Return+1.56%
MWTRX
Metropolitan West

Metropolitan West Total Return

Expense Ratio0.01%
5-Year Return-0.35%

Frequently Asked Questions

What is FXNAX?

FXNAX is the ticker symbol for Fidelity U.S. Bond Index Fund, a Intermediate Core Bond mutual fund managed by Fidelity. The fund normally invests at least 80% of the fund's assets in bonds included in the Bloomberg U.S. Aggregate Bond Index. Its manager uses statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. Aggregate Bond Index using a smaller number of securities. The fund invests in Fidelity's central funds.

What is the expense ratio for FXNAX?

FXNAX has an expense ratio of 0.00% per year. On a $10,000 investment, that amounts to roughly $0 annually in fund fees. This is considered a very low-cost fund.

How has FXNAX performed historically?

FXNAX has posted a 1-year return of +5.24%, 3-year return of +3.96%, 5-year return of +0.21%, 10-year return of +20.46%. Past performance does not guarantee future results. Returns are annualized for periods greater than one year.

What is the minimum investment for FXNAX?

FXNAX has no minimum initial investment requirement, making it accessible to all investors regardless of account size.

Is FXNAX a good investment?

Whether FXNAX is right for you depends on your investment goals, time horizon, and risk tolerance. Key factors to evaluate include its 0.00% expense ratio, Intermediate Core Bond category exposure, historical returns, and how it fits within your broader portfolio. We recommend comparing it against similar funds in the same category and consulting a qualified financial advisor.

Important: Past performance does not guarantee future results. This information is provided for educational purposes only and should not be considered investment advice. Please consult with a financial advisor before making investment decisions.

Compare Mutual Funds LogoCMF

Compare mutual funds with transparent, data-driven insights. Make informed investment decisions.

Product

  • Compare Funds
  • Learning Center
  • Fee Calculator
  • Return Simulator

Company

  • About Us

Legal

  • Disclosures
  • Privacy Policy
  • Terms of Service

© 2026 CompareMutualFunds. All rights reserved.

Investment information provided for educational purposes only. Past performance does not guarantee future results.