Morningstar

MFS Total Return Bond Fund Class R6 MRBKX

Morningstar Medalist Rating
Medalist Rating as of | See MFS Investment Hub
  • NAV / 1-Day Return 9.12  /  −0.22 %
  • Total Assets 7.8B
  • Adj. Expense Ratio
    0.360%
  • Expense Ratio 0.350%
  • Distribution Fee Level Below Average
  • Share Class Type Retirement, Large
  • Category Intermediate Core-Plus Bond
  • Credit Quality / Interest Rate Sensitivity Medium/Moderate
  • Min. Initial Investment 0
  • Status Open
  • TTM Yield 4.44%
  • Effective Duration 5.82 years

USD | NAV as of Oct 03, 2026 | 1-Day Return as of Oct 03, 2026, 1:34 AM GMT+0

Morningstar’s Analysis MRBKX

Will MRBKX outperform in the future?

Get our overall rating based on a fundamental assessment of the pillars below.

  • Process Pillar

    The Process Pillar is our assessment of how sensible, clearly defined, and repeatable MRBKX’s performance objective and investment process is for both security selection and portfolio construction.

  • People Pillar

    The People Pillar is our evaluation of the MRBKX management team’s experience and ability. We find that high-quality management teams deliver superior performance relative to their benchmarks and/or peers.

  • Parent Pillar

    The Parent Pillar is our rating of MRBKX’s parent organization’s priorities and whether they’re in line with investors’ interests.

Staying the course.

Senior Analyst Elbie Louw

Elbie Louw

Senior Analyst

Summary

MFS Total Return Bond is a well-run core-plus offering overseen by two experienced managers.

by Elbie Louw
Rated on Published on

Unlock our full analysis with Morningstar Investor

Portfolio Holdings MRBKX

More MRBKX Holdings
  • Current Portfolio Date
  • Equity Holdings —
  • Bond Holdings —
  • Other Holdings —
  • % Assets in Top 10 Holdings 24.3
Top 10 Holdings
% Portfolio Weight
Market Value USD
Sector

5 Year Treasury Note Future Dec 26

5.48 445M
Government

2 Year Treasury Note Future Dec 26

5.02 408M
Government

Ultra US Treasury Bond Future Dec 26

2.35 191M
Government

United States Treasury Bonds 4.75%

2.11 172M
Government

United States Treasury Notes 4.25%

2.06 168M
Government

United States Treasury Bonds 4.25%

1.93 156M
Government

Currency Cash CASH_USD

1.84 150M
Cash and Equivalents

Ultra 10 Year US Treasury Note Future Dec 26

1.84 149M
Government

United States Treasury Notes 4.25%

1.24 101M
Government

United States Treasury Notes 4.88%

1.15 93M
Government

Sponsor Center