FUENX vs. FNILX

Last updated Jun 4, 2026

FUENX (Fidelity Flex Municipal Income Fund) and FNILX (Fidelity ZERO Large Cap Index Fund) are both mutual funds - FUENX is a Municipal Bonds fund managed by Fidelity, while FNILX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 5 years, FUENX returned 1.31%/yr vs 14.13%/yr for FNILX. At a 0.05 correlation, their price movements are largely independent. Both charge a 0.00% expense ratio.

Performance

FUENX vs. FNILX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Flex Municipal Income Fund (FUENX) and Fidelity ZERO Large Cap Index Fund (FNILX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FUENX achieves a 1.79% return, which is significantly lower than FNILX's 11.56% return.

FUENX

• 1D: 0.20%
• 1M: 0.79%
• YTD: 1.79%
• 6M: 2.19%
• 1Y: 7.67%
• 3Y*: 4.49%
• 5Y*: 1.31%
• 10Y*: —

FNILX

• 1D: 0.26%
• 1M: 6.04%
• YTD: 11.56%
• 6M: 11.44%
• 1Y: 28.65%
• 3Y*: 23.01%
• 5Y*: 14.13%
• 10Y*: —

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

FUENX vs. FNILX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
FUENX Fidelity Flex Municipal Income Fund	1.79%	4.63%	2.32%	7.27%	-9.29%	1.99%	3.07%	8.27%	1.65%
FNILX Fidelity ZERO Large Cap Index Fund	11.56%	17.81%	25.47%	27.45%	-19.37%	26.67%	21.13%	31.79%	-13.60%

Correlation

The correlation between FUENX and FNILX is 0.17, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.17
Correlation (3Y) Calculated over the trailing 3-year period	0.15
Correlation (5Y) Calculated over the trailing 5-year period	0.13
Correlation (All Time) Calculated using the full available price history since Oct 1, 2018	0.05

The correlation between FUENX and FNILX shifts across timeframes, from 0.05 (all time) to 0.17 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

FUENX vs. FNILX — Risk / Return Rank

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

FUENX

FUENX Risk / Return Rank: 76
FUENX Sharpe Ratio Rank: 90
FUENX Sortino Ratio Rank: 94
FUENX Omega Ratio Rank: 95
FUENX Calmar Ratio Rank: 53
FUENX Martin Ratio Rank: 48

FNILX

FNILX Risk / Return Rank: 71
FNILX Sharpe Ratio Rank: 73
FNILX Sortino Ratio Rank: 65
FNILX Omega Ratio Rank: 64
FNILX Calmar Ratio Rank: 72
FNILX Martin Ratio Rank: 80

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.

FUENX vs. FNILX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Flex Municipal Income Fund (FUENX) and Fidelity ZERO Large Cap Index Fund (FNILX). 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.

	FUENX	FNILX	Difference
Sharpe ratio: Return per unit of total volatility	2.99	2.48	+0.51
Sortino ratio: Return per unit of downside risk	4.79	3.36	+1.43
Omega ratio: Gain probability vs. loss probability	1.78	1.45	+0.33
Calmar ratio: Return relative to maximum drawdown	2.79	3.28	-0.49
Martin ratio: Return relative to average drawdown	10.03	15.01	-4.99
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FUENX vs. FNILX - Sharpe Ratio Comparison

The current FUENX Sharpe Ratio is 2.99, which is comparable to the FNILX Sharpe Ratio of 2.48. The chart below compares the historical Sharpe Ratios of FUENX and FNILX, 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

	FUENX	FNILX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.99	2.48	+0.51
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.35	0.82	-0.47
Sharpe Ratio (All Time) Calculated using the full available price history	0.58	0.76	-0.18

Drawdowns

FUENX vs. FNILX - Drawdown Comparison

The maximum FUENX drawdown since its inception was -14.32%, smaller than the maximum FNILX drawdown of -33.76%. Use the drawdown chart below to compare losses from any high point for FUENX and FNILX.

Drawdown Indicators

	FUENX	FNILX	Difference
Max Drawdown Largest peak-to-trough decline	-14.32%	-33.76%	+19.44%
Max Drawdown (1Y) Largest decline over 1 year	-2.77%	-9.01%	+6.24%
Max Drawdown (3Y) Largest decline over 3 years	-5.34%	-19.08%	+13.74%
Max Drawdown (5Y) Largest decline over 5 years	-14.32%	-25.40%	+11.08%
Current Drawdown Current decline from peak	-0.34%	0.00%	-0.34%
Average Drawdown Average peak-to-trough decline	-2.92%	-5.37%	+2.45%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.77%	1.97%	-1.20%

Volatility

FUENX vs. FNILX - Volatility Comparison

The current volatility for Fidelity Flex Municipal Income Fund (FUENX) is 1.01%, while Fidelity ZERO Large Cap Index Fund (FNILX) has a volatility of 2.88%. This indicates that FUENX experiences smaller price fluctuations and is considered to be less risky than FNILX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FUENX	FNILX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.01%	2.88%	-1.87%
Volatility (6M) Calculated over the trailing 6-month period	2.02%	8.99%	-6.97%
Volatility (1Y) Calculated over the trailing 1-year period	2.59%	11.93%	-9.34%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.78%	17.25%	-13.47%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.20%	20.04%	-15.84%

FUENX vs. FNILX - Expense Ratio Comparison

FUENX has a 0.00% expense ratio, which is lower than FNILX's 0.00% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

FUENX vs. FNILX - Dividend Comparison

FUENX's dividend yield for the trailing twelve months is around 3.25%, more than FNILX's 0.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
FNILX Fidelity ZERO Large Cap Index Fund	0.91%	1.01%	1.09%	1.34%	1.53%	0.95%	1.20%	1.17%	0.53%	0.00%
FUENX Fidelity Flex Municipal Income Fund	3.25%	3.14%	2.90%	2.58%	1.38%	1.40%	1.54%	2.95%	2.61%	0.41%

Frequently Asked Questions

Can I hold both FUENX and FNILX in my portfolio?

FUENX and FNILX have a correlation of 0.17, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FUENX or FNILX?

FNILX has higher volatility (2.88%) compared to FUENX (1.01%). In terms of maximum drawdown, FUENX dropped -14.32% vs FNILX's -33.76%.

Which has better risk-adjusted returns?

FUENX currently has the higher Sharpe Ratio (2.99 vs 2.48), 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.