MFIOX Mutual Fund

NAV$5.81

AUM$1.1B

TER0.73%

Holdings517

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MFIOX Mutual Fund

NAV$5.81

MFS Income Fund

AUM$1.1B

TER0.73%

Holdings517

See how much of MFIOX you already own

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

Showing top 50 of 508 holdings · as of Jan 31, 2026

MFIOX holdings, by weight
#	Ticker	Name	Weight	Cumulative	Shares	Mkt value	Sector	Industry
1	Debt	U.S. Treasury BondsFinancials · Banks	3.07%	3.1%	-	$244.72M	Financials	Banks
2	Debt	Us Treas BdsFinancials · Banks	2.48%	5.5%	-	$197.89M	Financials	Banks
Sector and industry · Pro
3	Debt	United States Treasury Note/Bond 2029-04-30	2.27%	7.8%	-	$181.25M
4	Debt	Us Treasury N/B 4.75 2/45	1.95%	9.8%	-	$155.54M
5	Debt	Treasury Bond	1.90%	11.7%	-	$151.40M
6	Debt	Us Treasury Notes 2.5% 31-03-2027	1.89%	13.6%	-	$151.18M
7	Debt	United States Treasury Notes 4.500% 15-Apr-2027	1.79%	15.4%	-	$142.97M
8	—	Mfs Institutional Money Market Portfolio	1.70%	17.1%	135,760,501	$135.79M
9	Debt	United States Govt Us Treasury N/B 08/43 4.375	1.69%	18.7%	-	$134.60M
10	Debt	Treasury Bond	1.64%	20.4%	-	$131.01M
11	Debt	Treasury Bond (Otr) 4.5% Nov 15, 2054	1.28%	21.7%	-	$102.35M
12	Debt	US Treasury N/B 2.25 2/52	1.23%	22.9%	-	$98.07M
13	Debt	Us Treasury Note	1.04%	23.9%	-	$83.18M
14	Debt	United States Treasury Note/Bond	0.97%	24.9%	-	$77.70M
15	Debt	United States Treasuryu.S. Treasury Notes	0.86%	25.8%	-	$68.87M
16	Debt	Us Treasury N/B	0.72%	26.5%	-	$57.59M
17	Debt	Jefferies	0.59%	27.1%	-	$47.06M
18	Debt	Us Treasury N/ 4.75 11/53	0.58%	27.6%	-	$46.40M
19	Debt	Enel Finance International Nv	0.49%	28.1%	-	$39.28M
20	—	Mf1 2025-Fl19 Llc Mf1 2025-Fl19 As Variable Rate 05/18/2042	0.49%	28.6%	-	$39.25M
21	—	Store Master Funding Llc 4.98% 20 Oct 2055 4.98 2055-10-20	0.48%	29.1%	-	$38.44M
22	—	Santos Finance Ltd Regd 144A P/P 6.87500000	0.47%	29.6%	-	$37.40M
23	Debt	U.S. Treasury Bond, 4%, Due 11/15/2052	0.47%	30.0%	-	$37.53M
24	—	Autonation Inc 5.89% Mar 15, 2035	0.47%	30.5%	-	$37.44M
25	Debt	Sammons Financial Group Sr Unsecured 144A 04/34 6.875	0.45%	31.0%	-	$35.68M
26	—	Provident Funding Mortgage Trust, Series 2025-5, Class A4 5.5000008 2055-11-25	0.45%	31.4%	-	$36.01M
27	—	Mf1 2025-Fl19 B	0.44%	31.9%	-	$34.89M
28	—	Pfp 2024-11 Ltd 7.27 2039-09-17	0.44%	32.3%	-	$35.38M
29	—	Citigroup Inc 6.875 11/73 6.88 2173-11-15	0.43%	32.7%	-	$34.68M
30	Debt	Venture Global Lng	0.43%	33.2%	-	$34.55M
31	Debt	Us Treasury N/B 3.88% 30Apr2030	0.42%	33.6%	-	$33.16M
32	Debt	Vornado Realty Lp Sr Unsecured 02/33 5.75	0.41%	34.0%	-	$32.68M
33	Debt	Transdigm Inc	0.40%	34.4%	-	$32.30M
34	BAH	Booz Allen Hamilton Inc 5.95% Apr 15, 2035	0.40%	34.8%	-	$32.21M
35	—	Northwoods Capital Xiv-B Ltd., Series 2018-14Ba, Class Br	0.40%	35.2%	-	$31.86M
36	—	Beach Acquisition Bidco 10.00 2033-07-15	0.39%	35.6%	-	$31.18M
37	Debt	Comm_24-Cbm	0.39%	36.0%	-	$30.78M
38	—	Black Diamond Clo Ltd., Series 2019-2A, Class Br 8.0329896% 2032-07-23	0.39%	36.4%	-	$31.02M
39	—	Mf1 Llc, Series 2025-Fl20, Class C 5.8253616 2043-02-18	0.39%	36.7%	-	$31.29M
40	Debt	National Fin Re	0.39%	37.1%	-	$31.52M
41	—	Parallel Ltd., Series 2023-1A, Class A2R 6.09561 07/20/2036	0.39%	37.5%	-	$31.01M
42	—	Jane Street Grp/Jsg Fin Sr Secured 144A 05/33 6.75	0.38%	37.9%	-	$30.51M
43	Debt	First Industrial Lp Company Guar 01/31	0.37%	38.3%	-	$29.70M
44	—	Bain Capital Credit Clo Ltd., Series 2021-4A, Class Cr 5.6176308 2034-10-20	0.37%	38.6%	-	$29.40M
45	—	Charles Schwab Corporation 4.914% 14-Nov-2036, 4.91%, 11/14/36	0.37%	39.0%	-	$29.22M
46	—	Venture 43 Clo Ltd., Series 2021-43A, Class Cr 5.9221908 2034-04-15	0.37%	39.4%	-	$29.31M
47	Debt	Ntt Finan	0.36%	39.7%	-	$28.84M
48	—	Nomura Holdings Inc 7 Dec 31, 2079	0.36%	40.1%	-	$28.45M
49	PFGC	Performance Food Group Inc 6.13 2032-09-15	0.36%	40.5%	-	$28.57M
50	RRX	Regal Rexnord Corp.	0.36%	40.8%	-	$28.35M
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Not reported for this fund: share changes.

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MFIOX Mutual Fund All Holdings

MFIOX holdings total 517 positions. The top 10 holdings account for 20.4% of the fund, led by U.S. Treasury Bonds at 3.1%, Us Treas Bds 4.75% 11/15/43 at 2.5%, United States Treasury Note/Bond 2029-04-30 at 2.3%.

MFIOX portfolio concentration is well-diversified, with the top 10 representing 20.4% of total assets. The largest sector exposure is Financials at 46.3%.

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