MRBIX Mutual Fund

NAV$9.39

Fund Essentials - as of Jan 31, 2026

Net Assets
$1.8B
Expense Ratio
0.45%
Dividend Yield (Current)
3.81%
Holdings
1,075
Inception Date
Jan 4, 1999
Fund Family
MFS Investment Management
Investment Style
PRO
Asset Class
PRO
Legal Structure
PRO
Dividend Frequency
Monthly
SEC 30-Day Yield
PRO

Performance

YTD+0.95%
1 Year+3.98%
3 Year+4.86%
5 Year+0.50%
10 Year+2.15%

Asset Allocation

Bonds: 98.66%
Cash: 1.10%
Other: 0.24%

Price Chart (6M)

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Top Holdings

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TickerNameWeight
T 4.125 02/15/27Usa, Notes 4.125% 15Feb20273.85%
T 4.75 11/15/43United States Treasury Note, 4.75%, 11/15/20432.12%
T 4.25 06/30/29Treasury Note (Otr) 4.25% Jun 30, 20292.04%
T 4.25 02/15/54U.S. Treasury Bonds 2054-02-151.97%
T 4.25 11/15/34Treasury Note (Otr) 4.25% Nov 15, 20341.89%
Top 10 Concentration: 17.40%Report Date: Jan 31, 2026
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Dividend Summary

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Dividend Yield (Current)
3.81%
Frequency
Monthly
Latest Distribution
$0.02
-

Peer Comparison

Benchmark
PRO
Peer outperformance: PRO
Category rank: PRO
This Mutual Fund
PRO
Peer Avg
PRO
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Category rank, peer-average returns and outperformance, updated daily.
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MRBIX Mutual Fund Overview

MRBIX Mutual Fund (MFS Total Return Bond Fund Class I) is managed by MFS Investment Management with $1.84B in net assets. MRBIX expense ratio is 0.45%, holding 1075 positions across sectors including Financials, Other, Energy. Inception date: 1999-01-04.

MRBIX performance shows a YTD return of 0.95%. The 1-year return is 3.98% and the 5-year return is 0.50%. MRBIX dividend yield stands at 3.81%, paid monthly.

MRBIX top holdings include Usa, Notes 4.125% 15Feb2027 (3.9%), United States Treasury Note, 4.75%, 11/15/2043 (2.1%), Treasury Note (Otr) 4.25% Jun 30, 2029 (2.0%), U.S. Treasury Bonds 2054-02-15 (2.0%), Treasury Note (Otr) 4.25% Nov 15, 2034 (1.9%). View all MRBIX holdings, sector breakdown, or dividend history.

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