MFS Total Return Bond Fund Class I (MRBIX)

Fund Assets	8.09B
Expense Ratio	0.45%
Min. Investment	$0.00
Turnover	75.00%
Dividend (ttm)	0.40
Dividend Yield	4.19%
Dividend Growth	-4.81%
Payout Frequency	Monthly
Ex-Dividend Date	Jul 31, 2026

Previous Close	9.44
YTD Return	0.15%
1-Year Return	2.89%
5-Year Return	-0.88%
52-Week Low	9.39
52-Week High	9.76
Beta (5Y)	0.11
Holdings	1083
Inception Date	Jan 4, 1999

About MRBIX

MFS Total Return Bond Fund I Shares is a mutual fund specializing in the fixed income market, aiming for high total return through a combination of current income and long-term capital growth. The fund primarily invests at least 65% of its assets in a diversified portfolio of bonds and other fixed income securities, focusing on U.S. issuers. It belongs to the intermediate core-plus bond category, providing exposure to a broad range of credit qualities and maturities. Utilizing an active management approach, the fund incorporates U.S. Treasuries, mortgage-backed securities, corporate bonds, and related derivatives to navigate shifting interest rate and credit environments. Notable features include a low expense ratio and monthly income distributions, making it suitable for investors seeking steady cash flow from bond market investments. With a large asset base and a history dating back to 1999, the fund holds a significant position in the core bond arena, serving institutions and individuals alike who are seeking diversified fixed income exposure within their portfolios.

• Fund Family: MFS
• Category: Intermediate Core-Plus Bond
• Performance Rating: Average
• Risk Rating: Average
• Stock Exchange: NASDAQ
• Ticker Symbol: MRBIX
• Share Class: I
• Index: Bloomberg U.S. Aggregate Bond TR

Performance

MRBIX had a total return of 2.89% in the past year, including dividends. Since the fund's inception, the average annual return has been 4.20%.

Equivalent Funds

These are funds that follow the same index from the other major fund companies.

Symbol	Provider	Name	Expense Ratio
FGBPX	Fidelity	Fidelity Advisor Investment Grade Bond Fund - Class I	0.50%
FSMTX	Fidelity	Fidelity SAI Total Bond Fund	0.29%
FGBCX	Fidelity	Fidelity Advisor Investment Grade Bond Fund - Class C	1.52%
FGBTX	Fidelity	Fidelity Advisor Investment Grade Bond Fund - Class M	0.74%
FTKFX	Fidelity	Fidelity Total Bond K6 Fund	0.30%

Other Share Classes

These are alternative share classes of the same fund, from the same provider.

Symbol	Share Class	Expense Ratio
MRBKX	R6	0.36%
MRBJX	R4	0.45%
MRBFX	A	0.60%
MRBHX	R3	0.70%

Dividend History

Ex-Dividend	Amount	Pay Date
Jul 31, 2026	$0.03322	Aug 3, 2026
Jun 30, 2026	$0.03222	Jul 1, 2026
May 29, 2026	$0.03222	Jun 1, 2026
Apr 30, 2026	$0.03068	May 1, 2026
Mar 31, 2026	$0.0307	Apr 1, 2026
Feb 27, 2026	$0.03203	Mar 2, 2026

Data Sources: Tiingo, Twelve Data, and more

Historical data is provided by Tiingo. Delayed stock pricing data is provided by Twelve Data. Several fund data points are also provided by Finnhub.

Last checked:

Aug 11, 2026

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