MIOBX Mutual Fund

MIOBX Mutual Fund

NAV$5.60
See how much of MIOBX you already own
Just $25 once·$99/mo·Download sample
X-ray my portfolio free

Fund Essentials - as of May 31, 2026

Net Assets
$332,420.02
Expense Ratio
1.48%
Dividend Yield (Current)
4.02%
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-0.24%
1 Year+1.55%
3 Year+4.11%
5 Year-0.41%
10 Year+1.71%

Asset Allocation

Bonds: 98.20%
Cash: 1.92%
See how much of MIOBX you already own
Your funds unpacked, overlap, fees and score, free on screen. The full report comes with FundXLS. Download sample.
X-ray my portfolio free

Top Holdings

View All →
TickerNameWeight
-Ust Bond 2Yr Future Sep 30 2611.76%
-Ust Bond 5Yr Future Sep 30 263.77%
-Us Treasury Bond 4.5% Feb 15 442.92%
-Us Treasury Bond 4.875% Aug 15 452.61%
-Us Treasury Bond 4.75% Nov 15 432.34%
Top 10 Concentration: 32.87%Report Date: May 31, 2026
Download all 517 holdings for MIOBX
CSV export with sector, industry & share changes
Get CSV

Dividend Summary

View Details →
Dividend Yield (Current)
4.02%
Frequency
Monthly
Latest Distribution
$0.01
-

Peer Comparison

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

MIOBX Mutual Fund Overview

MIOBX Mutual Fund (MFS Income Fund Class B) is managed by MFS Investment Management with $332,420.02 in net assets. MIOBX expense ratio is 1.48%, holding 517 positions across sectors including Financials. Inception date: 1993-09-07.

MIOBX performance shows a YTD return of -0.24%. The 1-year return is 1.55% and the 5-year return is -0.41%. MIOBX dividend yield stands at 4.02%, paid monthly.

MIOBX top holdings include Ust Bond 2Yr Future Sep 30 26 (11.8%), Ust Bond 5Yr Future Sep 30 26 (3.8%), Us Treasury Bond 4.5% Feb 15 44 (2.9%), Us Treasury Bond 4.875% Aug 15 45 (2.6%), Us Treasury Bond 4.75% Nov 15 43 (2.3%). Go to all MIOBX holdings, MIOBX sectors, or MIOBX dividends.

MIOBX can be compared against other funds. Use MIOBX overlap to find shared positions, or MIOBX vs another fund for a side-by-side view. MIOBX alternatives are available via the screener, along with tax-loss harvesting opportunities.