MFS Corporate Bond Fund I (MBDIX)
12.71
+0.02
(+0.16%)
USD |
Oct 21 2025
Key Stats
Customize
| Net Expense Ratio | Total Assets Under Management | Weighted Average Dividend Yield | Turnover Ratio (Generic) |
|---|---|---|---|
| 0.51% | 4.652B | -- | 38.00% |
| 1 Year Fund Level Flows | 1 Year Total Returns (Daily) | Annualized Total Returns Since Inception (Daily) | Max Drawdown (Since Inception) |
| -249.83M | 7.09% | Upgrade | Upgrade |
Basic Info
| Investment Strategy | |
| The Fund seeks total return with an emphasis on current income, also considering capital appreciation. The Fund normally invests at least 80% of the funds net assets in corporate debt instruments. The Fund may also invest the funds assets in U.S. Government securities and also in foreign securities. |
| General | |
| Security Type | Mutual Fund |
| Broad Asset Class | Taxable Bond |
| Broad Category | Fixed Income |
| Global Peer Group | Bond USD Corporates |
| Peer Group | Corporate Debt Funds BBB-Rated |
| Global Macro | Bond Corporates |
| US Macro | General Domestic Taxable Fixed Income Funds |
| YCharts Categorization | -- |
| YCharts Benchmark | -- |
| Prospectus Objective | Corporate Debt Funds BBB-Rated |
| Fund Owner Firm Name | MFS |
| Broad Asset Class Benchmark Index | |
| ^BBUSATR | 100.0% |
Net Fund Flows Versus Peer Group
1 Month
% Rank:
95
-1.430B
Peer Group Low
1.377B
Peer Group High
1 Year
% Rank:
87
-249.83M
-5.687B
Peer Group Low
4.770B
Peer Group High
3 Months
% Rank:
77
-2.338B
Peer Group Low
1.210B
Peer Group High
3 Years
% Rank:
84
-6.365B
Peer Group Low
14.71B
Peer Group High
6 Months
% Rank:
93
-6.167B
Peer Group Low
3.166B
Peer Group High
5 Years
% Rank:
95
-22.55B
Peer Group Low
23.48B
Peer Group High
YTD
% Rank:
95
-6.351B
Peer Group Low
5.547B
Peer Group High
10 Years
% Rank:
33
-4.957B
Peer Group Low
54.90B
Peer Group High
Date Unavailable
Risk
Performance Versus Peer Group
Annual Total Returns Versus Peers
As of October 22, 2025.
Asset Allocation
As of August 31, 2025.
| Type | % Net |
|---|---|
| Cash | 0.90% |
| Stock | 0.00% |
| Bond | 98.87% |
| Convertible | 0.00% |
| Preferred | 0.00% |
| Other | 0.23% |
Top 10 Holdings
| Name | % Weight | Price | % Change |
|---|---|---|---|
| United States of America USGB 5.0 05/15/2045 FIX USD Government | 0.92% | 105.93 | 0.32% |
|
USD Cash
|
0.90% | -- | -- |
| UBS Group AG UBSGRO 3.126 08/13/2030 FLT USD Corporate 144A '29 | 0.74% | 96.16 | 0.09% |
| JPMorgan Chase & Co. JPM 2.545 11/08/2032 FLT USD Corporate '31 | 0.73% | 90.50 | 0.20% |
| THE BOEING COMPANY BA 5.805 05/01/2050 FIX USD Corporate | 0.72% | 101.71 | 0.56% |
| JPMorgan Chase & Co. JPM 6.07 10/22/2027 FLT USD Corporate '26 | 0.58% | 102.03 | -0.07% |
| British Overseas Territory of Bermuda BERMUD 5.0 07/15/2032 FIX USD Sovereign 144A | 0.57% | 102.73 | 0.15% |
| Sumitomo Mitsui Financial Group, Inc. SUMIBK 1.71 01/12/2031 FIX USD Corporate | 0.55% | 88.04 | 0.04% |
| The Northwestern Mutual Life Insurance Company NORMUT 6.17 05/29/2055 FIX USD Corporate 144A | 0.54% | 109.33 | 0.63% |
| CaixaBank, S.A. CAXBNK 6.84 09/13/2034 FLT USD Corporate 144A '33 | 0.53% | 112.42 | -0.05% |
Fees & Availability
| Fees | |
| Actual 12B-1 Fee | -- |
| Actual Management Fee | 0.37% |
| Administration Fee | 134.4K% |
| Maximum Front Load | -- |
| Maximum Deferred Load | -- |
| Maximum Redemption Fee | 0.00% |
| General Availability | |
| Available for Insurance Product | -- |
| Available for RRSP | -- |
| Purchase Details | |
| Open to New Investors |
|
| Minimum Initial Investment | 0.00 None |
| Minimum Subsequent Investment | 0.00 None |
Basic Info
| Investment Strategy | |
| The Fund seeks total return with an emphasis on current income, also considering capital appreciation. The Fund normally invests at least 80% of the funds net assets in corporate debt instruments. The Fund may also invest the funds assets in U.S. Government securities and also in foreign securities. |
| General | |
| Security Type | Mutual Fund |
| Broad Asset Class | Taxable Bond |
| Broad Category | Fixed Income |
| Global Peer Group | Bond USD Corporates |
| Peer Group | Corporate Debt Funds BBB-Rated |
| Global Macro | Bond Corporates |
| US Macro | General Domestic Taxable Fixed Income Funds |
| YCharts Categorization | -- |
| YCharts Benchmark | -- |
| Prospectus Objective | Corporate Debt Funds BBB-Rated |
| Fund Owner Firm Name | MFS |
| Broad Asset Class Benchmark Index | |
| ^BBUSATR | 100.0% |
Fundamentals
| General | |
| Distribution Yield | -- |
| Dividend Yield TTM (10-20-25) | 4.67% |
| 30-Day SEC Yield (9-30-25) | 4.58% |
| 7-Day SEC Yield | -- |
| Number of Holdings | 424 |
| Bond | |
| Yield to Maturity (8-31-25) | 5.28% |
| Effective Duration | 6.65 |
| Average Coupon | 5.07% |
| Calculated Average Quality | 3.648 |
| Effective Maturity | 10.33 |
| Nominal Maturity | 10.95 |
| Number of Bond Holdings | 415 |
As of August 31, 2025
Fund Details
| Key Dates | |
| Inception Date | 1/2/1997 |
| Last Annual Report Date | 4/30/2025 |
| Last Prospectus Date | 8/28/2025 |
| Share Classes | |
| MBRRX | Retirement |
| MFBBX | B |
| MFBCX | C |
| MFBFX | A |
| MFBGX | Retirement |
| MFBHX | Retirement |
| MFBJX | Retirement |
| MFBKX | Retirement |
| Attributes | |
| Index Fund | -- |
| Inverse Fund | -- |
| Leveraged Fund | -- |
| Fund of Funds | No |
| Currency Hedged Fund | -- |
| Synthetic Replication Fund | No |
Top Portfolio Holders
| Name | % Weight |
|---|---|
| Portfolio A | 5.00% |
| Portfolio B | 3.50% |
| Portfolio C | 2.25% |
Excel Add-In Codes
| Name: =YCI("M:MBDIX", "name") |
| Broad Asset Class: =YCI("M:MBDIX", "broad_asset_class") |
| Broad Category: =YCI("M:MBDIX", "broad_category_group") |
| Prospectus Objective: =YCI("M:MBDIX", "prospectus_objective") |
| To find the codes for any of our securities and financial metrics, see our Complete Excel Reference. |