MFS Municipal High Income Fund Class I (MMIIX)

Fund Assets	5.17B
Expense Ratio	0.64%
Min. Investment	$1,000
Turnover	9.00%
Dividend (ttm)	0.33
Dividend Yield	4.71%
Dividend Growth	2.57%
Payout Frequency	Monthly
Ex-Dividend Date	Sep 30, 2026

Previous Close	6.99
YTD Return	-2.74%
1-Year Return	-1.38%
5-Year Return	-0.36%
52-Week Low	6.90
52-Week High	7.54
Beta (5Y)	0.11
Holdings	2156
Inception Date	Jun 1, 2011

About MMIIX

MFS Municipal High Income Fund Class I is an open-end mutual fund specializing in high-yield municipal bonds. Its core objective is to provide investors with a total return focused on generating high levels of income exempt from federal income tax, while also considering capital appreciation. The fund typically allocates at least 80% of its net assets to municipal securities whose interest payments are federally tax-free. Distinctive to this fund is its emphasis on high-yield—often lower-rated—municipal issuances, thereby offering a higher income potential in exchange for moderately higher risk within the municipal bond space. With over 1,900 holdings and net assets exceeding $4.8 billion as of mid-2025, the fund exhibits substantial diversification across U.S. municipalities and related sectors. The portfolio is managed by an experienced team leveraging robust quantitative tools for risk assessment, aiming for consistent performance. Monthly distributions make it an attractive vehicle for investors seeking a steady tax-advantaged income stream. The fund’s role in the financial markets is to bridge the gap between conservative tax-exempt strategies and income-focused approaches, supporting municipal projects while catering to income-oriented investors prioritizing tax efficiency.

• Fund Family: MFS
• Category: High Yield Muni
• Performance Rating: Above Average
• Risk Rating: Average
• Stock Exchange: Nasdaq
• Ticker Symbol: MMIIX
• Share Class: I
• Index: Bloomberg Municipal Bond TR

Performance

MMIIX had a total return of -1.38% in the past year, including dividends. Since the fund's inception, the average annual return has been 3.82%.

Other Share Classes

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

Symbol	Share Class	Expense Ratio
MMHKX	R6	0.57%
MMHYX	A	0.66%
MMIIX	I	0.66%
MMHBX	B	1.41%

Dividend History

Ex-Dividend	Amount	Pay Date
Sep 30, 2026	$0.0281	Oct 1, 2026
Aug 31, 2026	$0.0285	Sep 1, 2026
Jul 31, 2026	$0.02769	Aug 3, 2026
Jun 30, 2026	$0.02691	Jul 1, 2026
May 29, 2026	$0.02773	Jun 1, 2026
Apr 30, 2026	$0.02674	May 1, 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:

Oct 16, 2026

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