MBRRX — MFS Corporate Bond Fund
Data updated: 2026-07-13
MBRRX — MFS Corporate Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Intermediate Corporate Bond · $4.38B AUM · 1.01% expense ratio · 5.0% 1-yr return. From SEC regulatory filings.
MBRRX Fund Overview
MBRRX — MFS Corporate Bond Fund is a US mutual fund managed by Mfs Series Trust IX, categorised as Intermediate Corporate Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Mfs Series Trust IX
- Category: Intermediate Corporate Bond
- Assets under management: $4.38B
- 1-year return: 5.0%
- Ticker: MBRRX
- SEC CIK: 0000063075
- SEC series ID: S000002492
- Share class ID: C000006722
MBRRX Holdings
Top 10 holdings of MFS Corporate Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| MFS Institutional Money Market Portfolio | 1.76% |
| UBS Group AG | 0.77% |
| JPMorgan Chase & Co. | 0.76% |
| Boeing Co. (The) | 0.74% |
| Charles Schwab Corp. (The) | 0.62% |
| Bermuda | 0.59% |
| Morgan Stanley | 0.58% |
| Sumitomo Mitsui Financial Group, Inc. | 0.57% |
| UBS Group AG | 0.54% |
| CaixaBank SA | 0.54% |
MBRRX Portfolio Allocation
Asset-class allocation of MFS Corporate Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 94.5% |
| Securitized | 3.2% |
| Cash & Equivalents | 1.8% |
MBRRX Performance
Total returns for MBRRX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | -0.1% |
| 1 year | 5.0% |
| 3 years (annualised) | 4.4% |
| 5 years (annualised) | 0.2% |
MBRRX Risk Information
Risk metrics for MBRRX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.4%
MBRRX Costs and Fees
MBRRX costs about $101 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.01%
- Gross expense ratio: 1.02%
- Portfolio turnover: 38%
- Brokerage commissions: 0.27 bps of average net assets (SEC N-CEN)
MBRRX Cashflows
Over the 12 months to 2026-04, MFS Corporate Bond Fund had net outflows of $162.92M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-04 | −$40.37M |
| 2026-03 | −$35.35M |
| 2026-02 | $981.62K |
| 2026-01 | −$10.44M |
| 2025-12 | −$52.64M |
| 2025-11 | $2.92M |
MBRRX Debt Constituents
Largest debt holdings of MFS Corporate Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| UBS Group AG | 0.77% |
| JPMorgan Chase & Co. | 0.76% |
| Boeing Co. (The) | 0.74% |
| Charles Schwab Corp. (The) | 0.62% |
| Bermuda | 0.59% |
| Morgan Stanley | 0.58% |
| Sumitomo Mitsui Financial Group, Inc. | 0.57% |
| UBS Group AG | 0.54% |
| CaixaBank SA | 0.54% |
| American Homes 4 Rent LP | 0.50% |
MBRRX Prospectus and SEC Filings
Official MFS Corporate Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Intermediate Corporate Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.