MFS Corporate Bond Fund Class B (MFBBX)

Fund Assets	4.15B
Expense Ratio	1.442%
Min. Investment	$1,000
Turnover	41.00%
Dividend (ttm)	0.46
Dividend Yield	3.90%
Dividend Growth	-2.24%
Payout Frequency	Monthly
Ex-Dividend Date	Sep 30, 2026

Previous Close	11.79
YTD Return	-3.10%
1-Year Return	-2.88%
5-Year Return	-7.38%
52-Week Low	11.72
52-Week High	12.71
Beta (5Y)	0.21
Holdings	427
Inception Date	May 8, 1974

About MFBBX

MFS Corporate Bond Fund B is an actively managed mutual fund focused on providing total return, emphasizing current income while also considering capital appreciation. The fund primarily invests in U.S. dollar-denominated corporate bonds and related debt securities, with a strong focus on credit analysis rather than duration management as its core value-adding strategy. The portfolio is constructed through a blend of fundamental and quantitative analysis, incorporating both micro and macroeconomic factors, and aims to hold corporate bonds that exhibit solid or improving financial fundamentals. While the majority of assets are allocated to investment-grade bonds, there is some exposure to non-investment grade debt as well. The fund utilizes sophisticated risk management techniques and maintains both long and short positions, including positions in U.S. Treasury futures and large-cap corporate issuers across sectors such as financials, industrials, and manufacturing. The benchmark for performance comparison is the Bloomberg U.S. Credit Bond Index, which tracks the market of publicly issued U.S. corporate debt. Managed by MFS Investment Management since 1974, the fund plays a role in providing credit market exposure and income generation within a diversified investment portfolio.

• Fund Family: MFS
• Category: Corporate Bond
• Performance Rating: Low
• Risk Rating: Average
• Stock Exchange: Nasdaq
• Ticker Symbol: MFBBX
• Share Class: B
• Index: Bloomberg U.S. Credit TR

Performance

MFBBX had a total return of -2.88% in the past year, including dividends. Since the fund's inception, the average annual return has been 3.91%.

Equivalent Funds

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

Symbol	Provider	Name	Expense Ratio
FIKOX	Fidelity	Fidelity Advisor Corporate Bond Z	0.36%
FCCCX	Fidelity	Fidelity Advisor Corporate Bond C	1.57%
FCBAX	Fidelity	Fidelity Advisor Corporate Bond A	0.75%
FCBTX	Fidelity	Fidelity Advisor Corporate Bond M	0.81%
FCBIX	Fidelity	Fidelity Advisor Corporate Bond I	0.49%

Other Share Classes

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

Symbol	Share Class	Expense Ratio
MFBKX	R6	0.41%
MFBJX	R4	0.50%
MBDIX	I	0.50%
MFBFX	A	0.75%

Dividend History

Ex-Dividend	Amount	Pay Date
Sep 30, 2026	$0.03983	Oct 1, 2026
Aug 31, 2026	$0.03846	Sep 1, 2026
Jul 31, 2026	$0.0383	Aug 3, 2026
Jun 30, 2026	$0.03727	Jul 1, 2026
May 29, 2026	$0.03719	Jun 1, 2026
Apr 30, 2026	$0.03521	May 1, 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:

Oct 16, 2026

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