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MMIBX vs. MUB
Performance
Risk-Adjusted Performance
Dividends
Drawdowns
Volatility

Correlation

The correlation between MMIBX and MUB is 0.57, which is considered to be moderate. This suggests that the two assets have some degree of positive relationship in their price movements. Moderate correlation can be acceptable for portfolio diversification, offering a balance between risk and potential returns.


-0.50.00.51.00.6

Performance

MMIBX vs. MUB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Municipal Income Fund (MMIBX) and iShares National AMT-Free Muni Bond ETF (MUB). The values are adjusted to include any dividend payments, if applicable.

-2.00%-1.00%0.00%1.00%2.00%SeptemberOctoberNovemberDecember2025
-0.41%
-0.34%
MMIBX
MUB

Key characteristics

Sharpe Ratio

MMIBX:

0.96

MUB:

0.38

Sortino Ratio

MMIBX:

1.33

MUB:

0.55

Omega Ratio

MMIBX:

1.20

MUB:

1.07

Calmar Ratio

MMIBX:

0.47

MUB:

0.33

Martin Ratio

MMIBX:

3.24

MUB:

1.31

Ulcer Index

MMIBX:

1.16%

MUB:

1.13%

Daily Std Dev

MMIBX:

3.87%

MUB:

3.88%

Max Drawdown

MMIBX:

-16.77%

MUB:

-13.68%

Current Drawdown

MMIBX:

-4.16%

MUB:

-1.61%

Returns By Period

Over the past 10 years, MMIBX has underperformed MUB with an annualized return of 1.59%, while MUB has yielded a comparatively higher 1.92% annualized return.


MMIBX

YTD

0.00%

1M

0.00%

6M

-0.41%

1Y

2.27%

5Y*

0.02%

10Y*

1.59%

MUB

YTD

-0.01%

1M

-0.01%

6M

-0.34%

1Y

0.69%

5Y*

0.68%

10Y*

1.92%

*Annualized

Compare stocks, funds, or ETFs

Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.


MMIBX vs. MUB - Expense Ratio Comparison

MMIBX has a 1.45% expense ratio, which is higher than MUB's 0.07% expense ratio.


MMIBX
MFS Municipal Income Fund
Expense ratio chart for MMIBX: current value at 1.45% compared with the broader market ranging from 0.00% to 2.12%.0.50%1.00%1.50%2.00%1.45%
Expense ratio chart for MUB: current value at 0.07% compared with the broader market ranging from 0.00% to 2.12%.0.50%1.00%1.50%2.00%0.07%

Risk-Adjusted Performance

MMIBX vs. MUB — Risk-Adjusted Performance Rank

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

MMIBX
The Risk-Adjusted Performance Rank of MMIBX is 4848
Overall Rank
The Sharpe Ratio Rank of MMIBX is 5151
Sharpe Ratio Rank
The Sortino Ratio Rank of MMIBX is 5050
Sortino Ratio Rank
The Omega Ratio Rank of MMIBX is 5656
Omega Ratio Rank
The Calmar Ratio Rank of MMIBX is 3838
Calmar Ratio Rank
The Martin Ratio Rank of MMIBX is 4646
Martin Ratio Rank

MUB
The Risk-Adjusted Performance Rank of MUB is 1616
Overall Rank
The Sharpe Ratio Rank of MUB is 1515
Sharpe Ratio Rank
The Sortino Ratio Rank of MUB is 1313
Sortino Ratio Rank
The Omega Ratio Rank of MUB is 1414
Omega Ratio Rank
The Calmar Ratio Rank of MUB is 1919
Calmar Ratio Rank
The Martin Ratio Rank of MUB is 1717
Martin Ratio Rank
The risk-adjusted ranks indicate the investment's position relative to the market. A rank closer to 100 signifies top-performing investments, while a rank closer to 0 might suggest underperformance, based on the selected ratio. The values are calculated based on the past 12 months of returns.

MMIBX vs. MUB - Risk-Adjusted Performance Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Municipal Income Fund (MMIBX) and iShares National AMT-Free Muni Bond ETF (MUB). 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.


Sharpe ratio
The chart of Sharpe ratio for MMIBX, currently valued at 0.96, compared to the broader market-1.000.001.002.003.004.000.960.38
The chart of Sortino ratio for MMIBX, currently valued at 1.33, compared to the broader market0.002.004.006.008.0010.0012.001.330.55
The chart of Omega ratio for MMIBX, currently valued at 1.20, compared to the broader market1.002.003.004.001.201.07
The chart of Calmar ratio for MMIBX, currently valued at 0.47, compared to the broader market0.005.0010.0015.000.470.33
The chart of Martin ratio for MMIBX, currently valued at 3.24, compared to the broader market0.0020.0040.0060.0080.003.241.31
MMIBX
MUB

The current MMIBX Sharpe Ratio is 0.96, which is higher than the MUB Sharpe Ratio of 0.38. The chart below compares the historical Sharpe Ratios of MMIBX and MUB, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.


Rolling 12-month Sharpe Ratio0.001.002.003.004.00SeptemberOctoberNovemberDecember2025
0.96
0.38
MMIBX
MUB

Dividends

MMIBX vs. MUB - Dividend Comparison

MMIBX's dividend yield for the trailing twelve months is around 2.73%, less than MUB's 2.76% yield.


TTM20242023202220212020201920182017201620152014
MMIBX
MFS Municipal Income Fund
2.73%3.20%2.70%1.92%1.45%1.86%2.29%2.69%2.69%2.88%2.75%2.70%
MUB
iShares National AMT-Free Muni Bond ETF
2.76%3.01%2.65%2.11%1.81%2.11%2.42%2.46%2.26%2.21%2.51%2.73%

Drawdowns

MMIBX vs. MUB - Drawdown Comparison

The maximum MMIBX drawdown since its inception was -16.77%, which is greater than MUB's maximum drawdown of -13.68%. Use the drawdown chart below to compare losses from any high point for MMIBX and MUB. For additional features, visit the drawdowns tool.


-5.00%-4.00%-3.00%-2.00%-1.00%0.00%SeptemberOctoberNovemberDecember2025
-4.16%
-1.61%
MMIBX
MUB

Volatility

MMIBX vs. MUB - Volatility Comparison

MFS Municipal Income Fund (MMIBX) and iShares National AMT-Free Muni Bond ETF (MUB) have volatilities of 1.16% and 1.15%, 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.


0.50%1.00%1.50%2.00%SeptemberOctoberNovemberDecember2025
1.16%
1.15%
MMIBX
MUB
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Disclaimer

The information contained herein does not constitute investment advice and made available for educational purposes only. Prices and returns on equities are listed without consideration of fees, commissions, taxes, penalties, or interest payable due to purchasing, holding, or selling.

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