FXNAX vs. FTBFX

Last updated Jun 19, 2026

FXNAX (Fidelity U.S. Bond Index Fund) and FTBFX (Fidelity Total Bond Fund) are both mutual funds - FXNAX is a Total Bond Market fund tracking the Bloomberg U.S. Aggregate Bond Index, while FTBFX is a Intermediate Core-Plus Bond fund actively managed by Fidelity. FXNAX is passively managed, while FTBFX is actively managed. Over the past 10 years, FXNAX returned 1.46%/yr vs 2.43%/yr for FTBFX. Their correlation of 0.94 suggests significant overlap in exposure. FXNAX charges 0.03%/yr vs 0.45%/yr for FTBFX.

Performance

FXNAX vs. FTBFX - Performance Comparison

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

Returns By Period

In the year-to-date period, FXNAX achieves a 0.21% return, which is significantly lower than FTBFX's 0.36% return. Over the past 10 years, FXNAX has underperformed FTBFX with an annualized return of 1.46%, while FTBFX has yielded a comparatively higher 2.43% annualized return.

FXNAX

• 1D: -0.38%
• 1M: 1.39%
• YTD: 0.21%
• 6M: 0.33%
• 1Y: 4.56%
• 3Y*: 3.95%
• 5Y*: -0.10%
• 10Y*: 1.46%

FTBFX

• 1D: -0.42%
• 1M: 1.42%
• YTD: 0.36%
• 6M: 0.40%
• 1Y: 4.86%
• 3Y*: 4.69%
• 5Y*: 0.54%
• 10Y*: 2.43%

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

FXNAX vs. FTBFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FXNAX Fidelity U.S. Bond Index Fund	0.21%	7.14%	1.35%	5.82%	-13.55%	-2.10%	7.63%	8.50%	0.04%	3.50%
FTBFX Fidelity Total Bond Fund	0.36%	7.50%	2.13%	7.25%	-13.58%	-0.44%	9.34%	9.89%	-0.66%	4.19%

Correlation

The correlation between FXNAX and FTBFX is 0.96 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.96
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.98
Correlation (10Y) Calculated over the trailing 10-year period	0.96
Correlation (All Time) Calculated using the full available price history since May 4, 2011	0.94

The correlation between FXNAX and FTBFX has been stable across timeframes, ranging from 0.94 to 0.98 - a consistent structural relationship.

Return for Risk

FXNAX vs. FTBFX — Risk / Return Rank

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

FXNAX

FXNAX Risk / Return Rank: 19
FXNAX Sharpe Ratio Rank: 19
FXNAX Sortino Ratio Rank: 20
FXNAX Omega Ratio Rank: 18
FXNAX Calmar Ratio Rank: 20
FXNAX Martin Ratio Rank: 18

FTBFX

FTBFX Risk / Return Rank: 23
FTBFX Sharpe Ratio Rank: 23
FTBFX Sortino Ratio Rank: 25
FTBFX Omega Ratio Rank: 23
FTBFX Calmar Ratio Rank: 24
FTBFX Martin Ratio Rank: 21

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. FTBFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity U.S. Bond Index Fund (FXNAX) and Fidelity Total Bond Fund (FTBFX). 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.

	FXNAX	FTBFX	Difference
Sharpe ratio: Return per unit of total volatility	1.17	1.31	-0.14
Sortino ratio: Return per unit of downside risk	1.78	1.97	-0.19
Omega ratio: Gain probability vs. loss probability	1.21	1.24	-0.03
Calmar ratio: Return relative to maximum drawdown	1.55	1.72	-0.17
Martin ratio: Return relative to average drawdown	4.50	5.01	-0.51

FXNAX vs. FTBFX - Sharpe Ratio Comparison

The current FXNAX Sharpe Ratio is 1.17, which is comparable to the FTBFX Sharpe Ratio of 1.31. The chart below compares the historical Sharpe Ratios of FXNAX and FTBFX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

FXNAX vs. FTBFX - Drawdown Comparison

The maximum FXNAX drawdown since its inception was -19.51%, which is greater than FTBFX's maximum drawdown of -18.25%. Use the drawdown chart below to compare losses from any high point for FXNAX and FTBFX.

Drawdown Indicators

	FXNAX	FTBFX	Difference
Max Drawdown Largest peak-to-trough decline	-19.51%	-18.25%	-1.26%
Max Drawdown (1Y) Largest decline over 1 year	-2.94%	-2.89%	-0.05%
Max Drawdown (3Y) Largest decline over 3 years	-6.16%	-5.82%	-0.34%
Max Drawdown (5Y) Largest decline over 5 years	-18.54%	-18.25%	-0.29%
Max Drawdown (10Y) Largest decline over 10 years	-19.51%	-18.25%	-1.26%
Current Drawdown Current decline from peak	-3.07%	-1.51%	-1.56%
Average Drawdown Average peak-to-trough decline	-3.86%	-2.32%	-1.54%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.01%	0.99%	+0.02%

Volatility

FXNAX vs. FTBFX - Volatility Comparison

Fidelity U.S. Bond Index Fund (FXNAX) and Fidelity Total Bond Fund (FTBFX) have volatilities of 1.31% and 1.30%, 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	FTBFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.31%	1.30%	+0.01%
Volatility (6M) Calculated over the trailing 6-month period	2.88%	2.88%	0.00%
Volatility (1Y) Calculated over the trailing 1-year period	3.91%	3.81%	+0.10%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.08%	5.67%	+0.41%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.01%	4.74%	+0.27%

FXNAX vs. FTBFX - Expense Ratio Comparison

FXNAX has a 0.03% expense ratio, which is lower than FTBFX's 0.45% expense ratio.

Dividends

FXNAX vs. FTBFX - Dividend Comparison

FXNAX's dividend yield for the trailing twelve months is around 3.71%, less than FTBFX's 4.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FTBFX Fidelity Total Bond Fund	4.36%	4.36%	4.15%	4.15%	2.54%	1.89%	5.22%	3.03%	3.19%	2.97%	3.61%	3.30%
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 FTBFX in my portfolio?

With a correlation of 0.96, FXNAX and FTBFX 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.

Which is riskier, FXNAX or FTBFX?

FXNAX has higher volatility (1.31%) compared to FTBFX (1.30%). In terms of maximum drawdown, FXNAX dropped -19.51% vs FTBFX's -18.25%.

Which has better risk-adjusted returns?

FTBFX currently has the higher Sharpe Ratio (1.31 vs 1.17), 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.