FXNAX vs. FSIAX

Last updated Jun 3, 2026

FXNAX (Fidelity U.S. Bond Index Fund) and FSIAX (Fidelity Advisor Strategic Income Fund Class M) are both Total Bond Market funds from Fidelity. Over the past 10 years, FXNAX returned 1.51%/yr vs 4.01%/yr for FSIAX. A 0.56 correlation means they provide meaningful diversification when combined. FXNAX charges 0.03%/yr vs 0.96%/yr for FSIAX.

Performance

FXNAX vs. FSIAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity U.S. Bond Index Fund (FXNAX) and Fidelity Advisor Strategic Income Fund Class M (FSIAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FXNAX achieves a 0.40% return, which is significantly lower than FSIAX's 3.11% return. Over the past 10 years, FXNAX has underperformed FSIAX with an annualized return of 1.51%, while FSIAX has yielded a comparatively higher 4.01% annualized return.

FXNAX

• 1D: -0.10%
• 1M: 0.13%
• YTD: 0.40%
• 6M: 0.43%
• 1Y: 5.37%
• 3Y*: 4.02%
• 5Y*: 0.09%
• 10Y*: 1.51%

FSIAX

• 1D: 0.08%
• 1M: 0.74%
• YTD: 3.11%
• 6M: 3.59%
• 1Y: 9.80%
• 3Y*: 7.50%
• 5Y*: 2.78%
• 10Y*: 4.01%

*Multi-year figures are annualized to reflect compound growth (CAGR)

FXNAX vs. FSIAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FXNAX Fidelity U.S. Bond Index Fund	0.40%	7.14%	1.35%	5.82%	-13.55%	-2.10%	7.63%	8.50%	0.04%	3.50%
FSIAX Fidelity Advisor Strategic Income Fund Class M	3.11%	8.59%	5.03%	8.83%	-12.06%	3.22%	7.30%	10.76%	-2.93%	7.54%

Correlation

The correlation between FXNAX and FSIAX is 0.71, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.71
Correlation (3Y) Calculated over the trailing 3-year period	0.79
Correlation (5Y) Calculated over the trailing 5-year period	0.79
Correlation (10Y) Calculated over the trailing 10-year period	0.65
Correlation (All Time) Calculated using the full available price history since May 5, 2011	0.56

The correlation between FXNAX and FSIAX shifts across timeframes, from 0.56 (all time) to 0.79 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

FXNAX vs. FSIAX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FXNAX

FXNAX Risk / Return Rank: 20
FXNAX Sharpe Ratio Rank: 18
FXNAX Sortino Ratio Rank: 20
FXNAX Omega Ratio Rank: 18
FXNAX Calmar Ratio Rank: 24
FXNAX Martin Ratio Rank: 22

FSIAX

FSIAX Risk / Return Rank: 85
FSIAX Sharpe Ratio Rank: 85
FSIAX Sortino Ratio Rank: 88
FSIAX Omega Ratio Rank: 85
FSIAX Calmar Ratio Rank: 82
FSIAX Martin Ratio Rank: 85

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

FXNAX vs. FSIAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity U.S. Bond Index Fund (FXNAX) and Fidelity Advisor Strategic Income Fund Class M (FSIAX). 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.

	FXNAX	FSIAX	Difference
Sharpe ratio Return per unit of total volatility	1.28	2.75	-1.47
Sortino ratio Return per unit of downside risk	1.93	4.19	-2.26
Omega ratio Gain probability vs. loss probability	1.23	1.58	-0.35
Calmar ratio Return relative to maximum drawdown	1.90	3.78	-1.88
Martin ratio Return relative to average drawdown	5.85	16.34	-10.49
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FXNAX vs. FSIAX - Sharpe Ratio Comparison

The current FXNAX Sharpe Ratio is 1.28, which is lower than the FSIAX Sharpe Ratio of 2.75. The chart below compares the historical Sharpe Ratios of FXNAX and FSIAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	FXNAX	FSIAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.28	2.75	-1.47
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.01	0.62	-0.60
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.30	0.90	-0.60
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	1.55	-1.09

Drawdowns

FXNAX vs. FSIAX - Drawdown Comparison

The maximum FXNAX drawdown since its inception was -19.51%, which is greater than FSIAX's maximum drawdown of -17.81%. Use the drawdown chart below to compare losses from any high point for FXNAX and FSIAX.

Drawdown Indicators

	FXNAX	FSIAX	Difference
Max Drawdown Largest peak-to-trough decline	-19.51%	-17.81%	-1.70%
Max Drawdown (1Y) Largest decline over 1 year	-2.94%	-2.66%	-0.28%
Max Drawdown (3Y) Largest decline over 3 years	-6.16%	-4.13%	-2.03%
Max Drawdown (5Y) Largest decline over 5 years	-18.54%	-16.19%	-2.35%
Max Drawdown (10Y) Largest decline over 10 years	-19.51%	-16.19%	-3.32%
Current Drawdown Current decline from peak	-2.89%	0.00%	-2.89%
Average Drawdown Average peak-to-trough decline	-3.87%	-1.84%	-2.03%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.96%	0.61%	+0.35%

Volatility

FXNAX vs. FSIAX - Volatility Comparison

Fidelity U.S. Bond Index Fund (FXNAX) and Fidelity Advisor Strategic Income Fund Class M (FSIAX) have volatilities of 1.42% and 1.41%, 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.

Volatility by Period

	FXNAX	FSIAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.42%	1.41%	+0.01%
Volatility (6M) Calculated over the trailing 6-month period	2.82%	2.94%	-0.12%
Volatility (1Y) Calculated over the trailing 1-year period	3.98%	3.55%	+0.43%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.07%	4.51%	+1.56%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.01%	4.46%	+0.55%

FXNAX vs. FSIAX - Expense Ratio Comparison

FXNAX has a 0.03% expense ratio, which is lower than FSIAX's 0.96% expense ratio.

Dividends

FXNAX vs. FSIAX - Dividend Comparison

FXNAX's dividend yield for the trailing twelve months is around 3.71%, less than FSIAX's 4.01% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSIAX Fidelity Advisor Strategic Income Fund Class M	4.01%	4.06%	3.21%	3.71%	2.71%	4.01%	4.32%	4.07%	3.51%	3.70%	3.49%	3.18%
FXNAX Fidelity U.S. Bond Index Fund	3.71%	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

Can I hold both FXNAX and FSIAX in my portfolio?

FXNAX and FSIAX have a correlation of 0.71, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FXNAX or FSIAX?

FXNAX has higher volatility (1.42%) compared to FSIAX (1.41%). In terms of maximum drawdown, FXNAX dropped -19.51% vs FSIAX's -17.81%.

Which has better risk-adjusted returns?

FSIAX currently has the higher Sharpe Ratio (2.75 vs 1.28), 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.