Morningstar

MFS Core Bond Fund R4 MCBKX

Morningstar Medalist Rating
Medalist Rating as of | See MFS Investment Hub
  • NAV / 1-Day Return 9.50  /  +0.21 %
  • Total Assets 34.4M
  • Adj. Expense Ratio
    0.390%
  • Expense Ratio 0.360%
  • Distribution Fee Level Average
  • Share Class Type Retirement, Large
  • Category Intermediate Core Bond
  • Credit Quality / Interest Rate Sensitivity High/Moderate
  • Min. Initial Investment 0
  • Status Open
  • TTM Yield 4.69%
  • Effective Duration 5.81 years

USD | NAV as of Jul 15, 2026 | 1-Day Return as of Jul 15, 2026, 1:15 AM GMT+0

Morningstar’s Analysis MCBKX

Will MCBKX 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 MCBKX’s performance objective and investment process is for both security selection and portfolio construction.

  • People Pillar

    The People Pillar is our evaluation of the MCBKX 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 MCBKX’s parent organization’s priorities and whether they’re in line with investors’ interests.

null Morningstar Automated Analysis

Morningstar Automated Analysis

Summary

MFS Core Bond R4 holds a quantitatively derived Gold Morningstar Medalist Rating. The rating reflects that it has scored particularly well on factors Morningstar research associates with future outperformance relative to category peers.

by Morningstar Automated Analysis
Rated on Published on

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Portfolio Holdings MCBKX

More MCBKX Holdings
  • Current Portfolio Date
  • Equity Holdings —
  • Bond Holdings —
  • Other Holdings —
  • % Assets in Top 10 Holdings 30.7
Top 10 Holdings
% Portfolio Weight
Market Value USD
Sector

2 Year Treasury Note Future Sept 26

8.38 3M
Government

5 Year Treasury Note Future Sept 26

4.66 2M
Government

United States Treasury Notes 4.25%

4.28 1M
Government

United States Treasury Bonds 4.5%

2.73 941,961
Government

United States Treasury Bonds 2.38%

2.68 925,050
Government

Ultra US Treasury Bond Future Sept 26

1.99 686,438
Government

United States Treasury Notes 3.5%

1.74 600,089
Government

United States Treasury Bonds 2.25%

1.57 542,590
Government

United States Treasury Bonds 4.25%

1.35 466,935
Government

United States Treasury Notes 3.88%

1.31 451,765
Government

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