MMIBX Mutual Fund

NAV$7.92

AUM$159,210.3

TER1.54%

Holdings2,375

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MMIBX Mutual Fund

NAV$7.92

MFS Municipal Income Fund Class B

AUM$159,210.3

TER1.54%

Holdings2,375

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Overview Performance Chart Dividends Top Holdings All Holdings Sectors Geography Similar Compare Overlap

Showing top 50 of 1,958 holdings · as of Aug 31, 2026

MMIBX holdings, by weight
#	Ticker	Name	Weight	Cumulative	Shares	Mkt value	Sector	Industry
1	—	Mfs Institutional Money Market Portfolio	2.66%	2.7%	-	$188.49M	-	-
2	—	Cash & Cash Equivalents	2.16%	4.8%	-	$153.94M	-	-
3	Debt	Black Belt Energy Gas District Al Ser A	0.52%	5.3%	35,010,000	$36.75M	-	-
4	Debt	Texas Municipal Gas Acquisition & Supply Corp Iv Tx Ser B	0.45%	5.8%	29,755,000	$31.99M	-	-
5	Debt	New York Transportation Development CorpReal Estate · Real Estate Management	0.41%	6.2%	29,265,000	$28.97M	Real Estate	Real Estate Management
6	Debt	New York Transportation Development Corporation, New York, Special Facility Revenue Bonds, John F Kennedy International Airport New Terminal 1 ProjectReal Estate · Real Estate Management	0.41%	6.6%	29,020,000	$29.50M	Real Estate	Real Estate Management
7	Debt	Princeton Independent School DistrictFinancials · Thrifts	0.41%	7.0%	28,405,000	$29.37M	Financials	Thrifts
8	Debt	California Community Choice Financing Authority Ca Variable-Green Bonds-Ser C	0.40%	7.4%	26,240,000	$28.10M	-	-
9	Debt	New Hampshire Business Finance Authority Nh Centurion Biosquare Inc-Ser A	0.40%	7.8%	27,905,000	$28.41M	-	-
10	Debt	City Of San Antonio Airport System Tx Amt-Ref Bam	0.36%	8.2%	24,690,000	$25.76M	-	-
11	Debt	New Hampshire Business Finance Authority Nh Winston Salem Sustainable Ener	0.35%	8.5%	23,440,000	$24.68M	-	-
12	Debt	Black Belt Energy Gas District Al Ser C	0.35%	8.9%	23,250,000	$25.03M	-	-
13	Debt	Black Belt Energy Gas District Al Gas Proj-Ser F	0.35%	9.2%	24,265,000	$25.25M	-	-
14	Debt	Pr Sales Tax Financing Corp Sales Tax Revenue Pr Restructured-Ser A-1	0.34%	9.6%	24,407,000	$23.85M	-	-
15	Debt	Town Of Queen Creek Az Az Cops	0.31%	9.9%	20,605,000	$22.11M	-	-
16	Debt	Pennsylvania Economic Dev Financing Authority Pa Amt-The Penndot Major Bridges Agm	0.31%	10.2%	21,860,000	$21.79M	-	-
17	Debt	Virginia Housing Development Authority Va Ser D	0.30%	10.5%	22,080,000	$21.15M	-	-
18	Debt	Dallas Metrocare Services Tx	0.30%	10.8%	20,790,000	$21.33M	-	-
19	Debt	Connecticut State Health & Educational Facilities Authority	0.30%	11.1%	20,000,000	$21.29M	-	-
20	Debt	West Virginia St Hosp Fin Auth Ref Impt Bds 2023b	0.30%	11.4%	19,920,000	$20.99M	-	-
21	—	Tennergy Corp Tenn Gas Rev 5.5% Oct 01, 2053Utilities · Power & Renewables	0.29%	11.7%	19,225,000	$20.41M	Utilities	Power & Renewables
22	—	New York St Transprtn Dev Corp Nyttrn 06/54 Fixed 6Financials · Diversified Financial Services	0.29%	12.0%	20,015,000	$20.74M	Financials	Diversified Financial Services
23	Debt	Jea Water & Sewer System Revenue Fl Ref-Ser A	0.29%	12.3%	19,530,000	$20.58M	-	-
24	Debt	Maryland Health & Higher Educ Fac Auth Md Ref-Medstar Health Issue-Ser A	0.29%	12.6%	20,000,000	$20.42M	-	-
25	Debt	Black Belt Energy Gas District Al Gas Project-Ser C	0.28%	12.8%	18,820,000	$20.12M	-	-
26	Debt	Black Belt Energy Gas District Var-Gas Proj-Ser A Al	0.28%	13.1%	19,750,000	$20.24M	-	-
27	—	Alachua County Health Facilities Authority, Series 2025 A 5.75 2060-10-01	0.28%	13.4%	18,585,000	$19.60M	-	-
28	—	Energy S Eal A Cooperative Di	0.28%	13.7%	18,915,000	$19.67M	-	-
29	Debt	Texas St Priv Activity Bond Su 12/31/2058 5.5Financials · Diversified Financial Services	0.27%	13.9%	18,960,000	$19.53M	Financials	Diversified Financial Services
30	Debt	Southeast Energy Authority A Cooperative District Al Proj #5-Ser A	0.27%	14.2%	18,165,000	$18.99M	-	-
31	Debt	Delaware State Housing Authority De Sustainable Bond-Luther Towers	0.27%	14.5%	19,424,158	$19.29M	-	-
32	—	Berks County Municipal Authority/The 5% 06-30-2039Utilities · Water Utilities	0.26%	14.7%	19,469,000	$18.55M	Utilities	Water Utilities
33	Debt	Chicago Board Of Education Dedicated Capital Improvement TaxConsumer Disc. · Diversified Consumer Services	0.26%	15.0%	17,805,000	$18.43M	Consumer Disc.	Diversified Consumer Services
34	Debt	Main Street Natural Gas Inc Ga Ser A	0.26%	15.3%	17,500,000	$18.36M	-	-
35	Debt	Spokane Cnty Wa Arpt Revenue	0.26%	15.5%	18,010,000	$18.31M	-	-
36	Debt	Black Belt Energy Gas District Ser B Al	0.26%	15.8%	17,190,000	$18.31M	-	-
37	Debt	California Housing Finance Agency Ca Social Certificates-Ser 1 Clas	0.25%	16.0%	17,681,405	$17.65M	-	-
38	—	Fishers Town Hall Bldg Corp Ind Lease Rent RevReal Estate · Real Estate Management	0.24%	16.3%	16,030,000	$17.14M	Real Estate	Real Estate Management
39	Debt	Maryland Department Of Housing & Comm Dev Ref-Sustainable Ser E Md Gnma/Fnma/Fhlmc	0.24%	16.5%	14,860,000	$16.81M	-	-
40	Debt	Pennsylvania Economic Development Financing Authority Pa Pa Bridges Finco Lp	0.24%	16.7%	16,660,000	$16.82M	-	-
41	Debt	Kentucky Public Energy Authority Ky Ser B	0.24%	17.0%	16,355,000	$16.83M	-	-
42	—	Wisconsin Health & Educational Facilities Authority 4 2040-04-01	0.23%	17.2%	17,300,000	$16.56M	-	-
43	Debt	New Hampshire Business Finance Authority Nh Centurion Foundation West Main	0.23%	17.4%	16,680,000	$16.61M	-	-
44	Debt	Colorado Health Facilities Authority Co Adventist Health System/Sunbel	0.23%	17.7%	18,540,000	$16.47M	-	-
45	—	Jefferson Cnty Al Swr Revenue 5.5 10-01-2053Utilities · Water Utilities	0.22%	17.9%	15,180,000	$15.96M	Utilities	Water Utilities
46	Debt	NycdevReal Estate · Real Estate Management	0.22%	18.1%	15,300,000	$15.55M	Real Estate	Real Estate Management
47	Debt	Energy Southeast A Cooperative District Muni Put Bond ActUtilities · Electric Utilities	0.22%	18.3%	14,150,000	$15.52M	Utilities	Electric Utilities
48	Debt	Travis County Healthcare District Tx Ctfs Oblig	0.22%	18.6%	15,000,000	$15.91M	-	-
49	—	Indust Development Auth Of The City Of Phoenix/The Az Amt-Variable-Ref-Republic Services Vrb Dec 01 35	0.22%	18.8%	15,300,000	$15.33M	-	-
50	Debt	San Antonio Water System Tx Junior Lien-Ser B	0.22%	19.0%	15,000,000	$15.80M	-	-
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MMIBX Mutual Fund All Holdings

MMIBX holdings total 2375 positions. The top 10 holdings account for 8.2% of the fund, led by Mfs Institutional Money Market Portfolio at 2.7%, Cash & Cash Equivalents at 2.2%, Black Belt Energy Gas District Al Ser A 5.000 Dec 01 34 at 0.5%.

MMIBX portfolio concentration is well-diversified, with the top 10 representing 8.2% of total assets. The largest sector exposure is Financials at 6.9%.

MMIBX sectors provide a detailed breakdown. MMIBX overlap shows how holdings compare to other funds in your portfolio.