FNDSX vs. FXNAX
FNDSX (Fidelity Sustainability Bond Index Fund) and FXNAX (Fidelity U.S. Bond Index Fund) are both Total Bond Market funds from Fidelity. Over the past 5 years, FNDSX returned -0.59%/yr vs -0.49%/yr for FXNAX. Their 0.98 correlation means they have historically moved very closely together. FNDSX charges 0.10%/yr vs 0.03%/yr for FXNAX.
Performance
FNDSX vs. FXNAX - Performance Comparison
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Returns By Period
The year-to-date returns for both investments are quite close, with FNDSX having a -0.66% return and FXNAX slightly higher at -0.63%.
FNDSX
- 1D
- 0.00%
- 1M
- -1.29%
- 6M
- -0.98%
- YTD
- -0.66%
- 1Y
- 1.68%
- 3Y*
- 3.57%
- 5Y*
- -0.59%
- 10Y*
- —
- ALL TIME*
- 1.57%
FXNAX
- 1D
- 0.10%
- 1M
- -1.25%
- 6M
- -0.85%
- YTD
- -0.63%
- 1Y
- 1.77%
- 3Y*
- 3.69%
- 5Y*
- -0.49%
- 10Y*
- 1.25%
- ALL TIME*
- 1.96%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
FNDSX vs. FXNAX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | |
|---|---|---|---|---|---|---|---|---|---|
FNDSX Fidelity Sustainability Bond Index Fund | -0.66% | 7.03% | 1.23% | 5.44% | -13.34% | -2.22% | 6.95% | 8.30% | 1.89% |
FXNAX Fidelity U.S. Bond Index Fund | -0.63% | 7.14% | 1.35% | 5.82% | -13.55% | -2.10% | 7.63% | 8.50% | 2.20% |
Correlation
The correlation between FNDSX and FXNAX is 0.96 - they have historically moved very closely together. At this level, their price movements offset little of one another.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.96 |
Correlation (3Y) Balances recent behavior with more history. | 0.98 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.98 |
Correlation (All Time) Calculated using the full available price history since Jun 19, 2018 | 0.98 |
The correlation between FNDSX and FXNAX has been stable across timeframes, ranging from 0.96 to 0.98 - a consistent structural relationship.
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Return for Risk
FNDSX vs. FXNAX — Risk / Return Rank
FNDSX
FXNAX
FNDSX vs. FXNAX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Fidelity Sustainability Bond Index Fund (FNDSX) and Fidelity U.S. Bond Index Fund (FXNAX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| FNDSX | FXNAX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.02 | ||
| Sortino ratioReturn per unit of downside risk | -0.04 | ||
| Omega ratioGain probability vs. loss probability | 1.13 | 1.14 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 0.99 | 1.01 | -0.02 |
| Martin ratioReturn relative to average drawdown | 2.44 | 2.55 | -0.12 |
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Drawdowns
FNDSX vs. FXNAX - Drawdown Comparison
The maximum FNDSX drawdown since its inception was -19.72%, roughly equal to the maximum FXNAX drawdown of -19.51%. Use the drawdown chart below to compare losses from any high point for FNDSX and FXNAX.
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Drawdown Indicators
| FNDSX | FXNAX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.72% | -19.51% | -0.21% |
Max Drawdown (1Y)Largest decline over 1 year | -2.94% | -2.94% | 0.00% |
Max Drawdown (3Y)Largest decline over 3 years | -5.10% | -5.11% | +0.01% |
Max Drawdown (5Y)Largest decline over 5 years | -18.30% | -18.54% | +0.24% |
Max Drawdown (10Y)Largest decline over 10 years | — | -19.51% | — |
Current DrawdownCurrent decline from peak | -4.78% | -3.89% | -0.89% |
Average DrawdownAverage peak-to-trough decline | -6.44% | -3.86% | -2.58% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.19% | 1.17% | +0.02% |
Volatility
FNDSX vs. FXNAX - Volatility Comparison
Fidelity Sustainability Bond Index Fund (FNDSX) and Fidelity U.S. Bond Index Fund (FXNAX) have volatilities of 0.99% and 0.99%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| FNDSX | FXNAX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.99% | 0.99% | 0.00% |
Volatility (6M)Calculated over the trailing 6-month period | 3.02% | 3.02% | 0.00% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.85% | 3.85% | 0.00% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.01% | 6.07% | -0.06% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.28% | 5.01% | +0.27% |
FNDSX vs. FXNAX - Expense Ratio Comparison
FNDSX has a 0.10% expense ratio, which is higher than FXNAX's 0.03% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
FNDSX vs. FXNAX - Dividend Comparison
FNDSX's dividend yield for the trailing twelve months is around 3.70%, more than FXNAX's 3.46% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FNDSX Fidelity Sustainability Bond Index Fund | 3.70% | 3.84% | 3.53% | 2.84% | 1.55% | 1.17% | 1.79% | 3.17% | 1.56% | 0.00% | 0.00% | 0.00% |
FXNAX Fidelity U.S. Bond Index Fund | 3.46% | 3.58% | 3.40% | 3.15% | 1.81% | 1.74% | 2.92% | 2.68% | 2.74% | 2.57% | 2.76% | 2.52% |
Frequently Asked Questions
With a correlation of 0.96, FNDSX and FXNAX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
FXNAX has higher volatility (0.99%) compared to FNDSX (0.99%). In terms of maximum drawdown, FNDSX dropped -19.72% vs FXNAX's -19.51%.
FXNAX currently has the higher Sharpe Ratio (0.78 vs 0.76), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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