MFS Municipal Income Fund Class B1 (MMIGX)

Fund Assets	7.07B
Expense Ratio	1.29%
Min. Investment	$1,000
Turnover	12.00%
Dividend (ttm)	0.26
Dividend Yield	3.27%
Dividend Growth	5.46%
Payout Frequency	Monthly
Ex-Dividend Date	Jul 31, 2026

Previous Close	8.10
YTD Return	0.66%
1-Year Return	5.64%
5-Year Return	-0.50%
52-Week Low	7.90
52-Week High	8.31
Beta (5Y)	0.08
Holdings	2343
Inception Date	Jun 25, 2007

About MMIGX

MFS Municipal Income Fund Class B1 is a long-duration, actively managed mutual fund focused on generating total return, with an emphasis on income that is exempt from federal income tax. The fund predominantly invests in a diversified portfolio of municipal bonds issued by various U.S. state and local governments to finance public projects, such as infrastructure, schools, and utilities. Its strategy favors investment-grade securities but may also allocate a portion to bonds of lower credit quality, balancing risk and potential returns. Class B1 shares are available to holders who acquired them through a legacy fund acquisition process. As of mid-2025, the fund holds over $5.8 billion in net assets, with municipal holdings comprising the vast majority of its portfolio. The fund employs a risk-aware management approach utilizing both quantitative market tools and experienced analysts to identify and mitigate risks. Income is distributed monthly, and the fund is benchmarked to the Bloomberg Municipal Bond Index, reflecting its alignment with the broader national municipal bond market. MFS brings decades of municipal bond investing experience and seeks to provide consistent, tax-advantaged income for investors.

• Fund Family: MFS
• Category: Muni National Long
• Performance Rating: Below Average
• Risk Rating: Average
• Stock Exchange: NASDAQ
• Ticker Symbol: MMIGX
• Share Class: B1
• Index: Bloomberg Municipal Bond TR

Performance

MMIGX had a total return of 5.64% in the past year, including dividends. Since the fund's inception, the average annual return has been 2.87%.

Equivalent Funds

These are funds that follow the same index from the other major fund companies.

Symbol	Provider	Name	Expense Ratio
FLUVX	Fidelity	Fidelity Advisor Municipal Income M	0.75%
FKISX	Fidelity	Fidelity Advisor Municipal Income C	1.50%
FROGX	Fidelity	Fidelity Advisor Municipal Income I	0.50%
FUENX	Fidelity	Fidelity Flex Municipal Income Fund	n/a
FHIGX	Fidelity	Fidelity Municipal Income Fund	0.43%

Other Share Classes

These are alternative share classes of the same fund, from the same provider.

Symbol	Share Class	Expense Ratio
MPMNX	R6	0.47%
MMIDX	A1	0.54%
MIMIX	I	0.54%
MFIAX	A	0.79%

Dividend History

Ex-Dividend	Amount	Pay Date
Jul 31, 2026	$0.02273	Aug 3, 2026
Jun 30, 2026	$0.02206	Jul 1, 2026
May 29, 2026	$0.02274	Jun 1, 2026
Apr 30, 2026	$0.0219	May 1, 2026
Mar 31, 2026	$0.02243	Apr 1, 2026
Feb 27, 2026	$0.02051	Mar 2, 2026

Data Sources: Tiingo, Twelve Data, and more

Historical data is provided by Tiingo. Delayed stock pricing data is provided by Twelve Data. Several fund data points are also provided by Finnhub.

Last checked:

Aug 21, 2026

Data Sources Report a data error