FMBIX vs. FXAIX

Last updated Apr 2, 2026

Compare and contrast key facts about Fidelity Municipal Bond Index Fund (FMBIX) and Fidelity 500 Index Fund (FXAIX).

FMBIX is managed by Fidelity. It was launched on Jul 11, 2019. FXAIX is a passively managed fund by Fidelity that tracks the performance of the S&P 500 Index. It was launched on Feb 17, 1988.

Performance

FMBIX vs. FXAIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Municipal Bond Index Fund (FMBIX) and Fidelity 500 Index Fund (FXAIX). The values are adjusted to include any dividend payments, if applicable.

FMBIX vs. FXAIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
FMBIX Fidelity Municipal Bond Index Fund	0.00%	0.60%	1.32%	5.89%	-10.00%	1.14%	3.10%	1.48%
FXAIX Fidelity 500 Index Fund	-4.34%	17.84%	25.01%	26.29%	-18.14%	28.71%	18.42%	9.24%

Returns By Period

FMBIX

• 1D: —
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

FXAIX

• 1D: 2.92%
• 1M: -5.02%
• YTD: -4.34%
• 6M: -2.14%
• 1Y: 17.32%
• 3Y*: 18.30%
• 5Y*: 11.79%
• 10Y*: 14.08%

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

FMBIX vs. FXAIX - Expense Ratio Comparison

FMBIX has a 0.07% expense ratio, which is higher than FXAIX's 0.02% 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%.

FMBIX

Fidelity Municipal Bond Index Fund

FXAIX

Fidelity 500 Index Fund

Return for Risk

FMBIX vs. FXAIX — Risk / Return Rank

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

FXAIX

FXAIX Risk / Return Rank: 60
FXAIX Sharpe Ratio Rank: 48
FXAIX Sortino Ratio Rank: 53
FXAIX Omega Ratio Rank: 56
FXAIX Calmar Ratio Rank: 64
FXAIX Martin Ratio Rank: 76

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.

FMBIX vs. FXAIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Municipal Bond Index Fund (FMBIX) and Fidelity 500 Index Fund (FXAIX). 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	FMBIX	FXAIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	0.97	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.70	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.78	—
Sharpe Ratio (All Time) Calculated using the full available price history	—	0.76	—

Correlation

The correlation between FMBIX and FXAIX is 0.04, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

FMBIX vs. FXAIX - Dividend Comparison

FMBIX has not paid dividends to shareholders, while FXAIX's dividend yield for the trailing twelve months is around 1.16%.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FMBIX Fidelity Municipal Bond Index Fund	0.00%	0.70%	2.60%	2.29%	1.17%	1.28%	1.59%	0.77%	0.00%	0.00%	0.00%	0.00%
FXAIX Fidelity 500 Index Fund	1.16%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%

Drawdowns

Drawdown Indicators

	FMBIX	FXAIX	Difference
Max Drawdown Largest peak-to-trough decline	—	-33.79%	—
Max Drawdown (1Y) Largest decline over 1 year	—	-12.13%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-24.50%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-33.79%	—
Current Drawdown Current decline from peak	—	-6.23%	—
Average Drawdown Average peak-to-trough decline	—	-3.83%	—
Ulcer Index Depth and duration of drawdowns from previous peaks	—	2.53%	—

Volatility

Volatility by Period

	FMBIX	FXAIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	5.34%	—
Volatility (6M) Calculated over the trailing 6-month period	—	9.53%	—
Volatility (1Y) Calculated over the trailing 1-year period	—	18.32%	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	—	16.92%	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	—	18.05%	—