MIOBX Mutual Fund

NAV$5.77

Fund Essentials - as of Jan 31, 2026

Net Assets
$371,959.34
Expense Ratio
1.48%
Dividend Yield (Current)
3.61%
Holdings
517
Inception Date
Sep 7, 1993
Fund Family
MFS Investment Management
Investment Style
PRO
Asset Class
PRO
Legal Structure
PRO
Dividend Frequency
Monthly
SEC 30-Day Yield
PRO

Performance

YTD-3.03%
1 Year+3.46%
3 Year+4.30%
5 Year-0.07%
10 Year+2.04%

Asset Allocation

Bonds: 98.33%
Cash: 1.71%

Price Chart (6M)

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Top Holdings

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TickerNameWeight
T 4.5 02/15/44United States Treasury Notes 4.50% Feb 15, 20443.07%
T 4.75 11/15/43United States Treasury Note, 4.75%, 11/15/20432.48%
T 4.625 04/30/29Treasury Note (Otr) 4.63% Apr 30, 20292.27%
T 4.75 02/15/45Us Treasury N/B 4.75 2045-02-151.95%
T 4.25 02/15/54U.S. Treasury Bonds 2054-02-151.90%
Top 10 Concentration: 20.38%Report Date: Jan 31, 2026
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Dividend Summary

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Dividend Yield (Current)
3.61%
Frequency
Monthly
Latest Distribution
$0.01
-

Peer Comparison

Benchmark
PRO
Peer outperformance: PRO
Category rank: PRO
This Mutual Fund
PRO
Peer Avg
PRO
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MIOBX Mutual Fund Overview

MIOBX Mutual Fund (MFS Income Fund Class B) is managed by MFS Investment Management with $371,959.34 in net assets. MIOBX expense ratio is 1.48%, holding 517 positions across sectors including Financials, Other, Energy. Inception date: 1993-09-07.

MIOBX performance shows a YTD return of -3.03%. The 1-year return is 3.46% and the 5-year return is -0.07%. MIOBX dividend yield stands at 3.61%, paid monthly.

MIOBX top holdings include United States Treasury Notes 4.50% Feb 15, 2044 (3.1%), United States Treasury Note, 4.75%, 11/15/2043 (2.5%), Treasury Note (Otr) 4.63% Apr 30, 2029 (2.3%), Us Treasury N/B 4.75 2045-02-15 (1.9%), U.S. Treasury Bonds 2054-02-15 (1.9%). View all MIOBX holdings, sector breakdown, or dividend history.

MIOBX can be compared against other funds using the overlap calculator or side-by-side comparison tool. MIOBX alternatives are available via the screener, along with tax-loss harvesting opportunities.