MIOBX Holdings — MFS Income Fund
Data updated: 2026-09-28
MIOBX holds 539 securities. The top 10 make up 19.3% of net assets, led by U.S. Treasury Bonds (2.79%) and U.S. Treasury Bonds (2.72%). Corporate Bonds (42.0%) and Mortgage / Securitized (29.1%) are the largest sectors, and 75.4% of the portfolio is in United States. Debt holdings: 310 positions, 68.9% of assets.
Holdings cover 99.59% of net asset value (98.77% of total assets; remainder is cash and receivables). As of July 31, 2026 · N-PORT.
MIOBX Portfolio Holdings
539 holdings of MFS Income Fund by percentage of net assets, from the fund's SEC N-PORT filing as of July 31, 2026. The 100 largest are listed below; the interactive table on this page lists all 539.
| Holding | Ticker | Sector | % of net assets | Value (USD) |
|---|---|---|---|---|
| U.S. Treasury Bonds | — | Government Bonds | 2.79% | $232.28M |
| U.S. Treasury Bonds | — | Government Bonds | 2.72% | $226.57M |
| U.S. Treasury Bonds | — | Government Bonds | 2.26% | $187.89M |
| U.S. Treasury Notes | — | Government Bonds | 2.13% | $177.34M |
| U.S. Treasury Bonds | — | Government Bonds | 1.77% | $147.56M |
| U.S. Treasury Bonds | — | Government Bonds | 1.72% | $142.90M |
| U.S. Treasury Bonds | — | Government Bonds | 1.62% | $134.73M |
| U.S. Treasury Bonds | — | Government Bonds | 1.54% | $127.83M |
| U.S. Treasury Bonds | — | Government Bonds | 1.49% | $123.64M |
| U.S. Treasury Notes | — | Government Bonds | 1.27% | $105.29M |
| MFS Institutional Money Market Portfolio, Class A | — | Funds & ETFs | 1.20% | $100.18M |
| U.S. Treasury Bonds | — | Government Bonds | 1.11% | $92.59M |
| U.S. Treasury Notes | — | Government Bonds | 0.81% | $67.43M |
| Jefferies Financial Group, Inc. | — | Corporate Bonds | 0.60% | $49.85M |
| QTS Fayetteville I Dc1-2 LLC | — | Corporate Bonds | 0.57% | $47.18M |
| U.S. Treasury Bonds | — | Government Bonds | 0.53% | $43.77M |
| Horseshoe Funding Trust I | — | Corporate Bonds | 0.51% | $42.60M |
| Beacon Point DC LLC | — | Corporate Bonds | 0.48% | $39.79M |
| LLC, Series 2025-FL19, Class AS | — | Mortgage / Securitized | 0.47% | $39.25M |
| Beach Acquisition Bidco LLC | — | Corporate Bonds | 0.47% | $39.00M |
| New Residential Mortgage Loan Trust, Series 2026-NQM3, Class A1 | — | Mortgage / Securitized | 0.46% | $38.05M |
| ENEL Finance International NV | — | Corporate Bonds | 0.46% | $37.93M |
| Venture Global LNG, Inc. | — | Corporate Bonds | 0.46% | $37.93M |
| PMT Loan Trust, Series 2026-INV2, Class A35 | — | Mortgage / Securitized | 0.46% | $37.92M |
| STORE Master Funding LLC, Series 2025-1A, Class A2 | — | Mortgage / Securitized | 0.45% | $37.52M |
| Santos Finance Ltd. | — | Corporate Bonds | 0.44% | $36.47M |
| AutoNation, Inc. | — | Corporate Bonds | 0.43% | $36.11M |
| Dwight Issuer LLC, Series 2026-FL2, Class B | — | Mortgage / Securitized | 0.43% | $35.53M |
| U.S. Treasury Bonds | — | Government Bonds | 0.43% | $35.41M |
| PFP Ltd., Series 2024-11, Class AS | — | Mortgage / Securitized | 0.43% | $35.35M |
| LLC, Series 2025-FL19, Class B | — | Mortgage / Securitized | 0.42% | $34.87M |
| Sammons Financial Group, Inc. | — | Corporate Bonds | 0.42% | $34.58M |
| Citigroup, Inc., Series GG | — | Corporate Bonds | 0.41% | $34.28M |
| Bain Capital Credit CLO Ltd., Series 2021-4A, Class CRR | — | Mortgage / Securitized | 0.41% | $33.97M |
| U.S. Treasury Notes | — | Government Bonds | 0.39% | $32.43M |
| Vornado Realty LP | — | Corporate Bonds | 0.39% | $32.03M |
| Northwoods Capital XIV-B Ltd., Series 2018-14BA, Class BR | — | Mortgage / Securitized | 0.38% | $31.86M |
| TransDigm, Inc. | — | Corporate Bonds | 0.38% | $31.86M |
| MF1 LLC, Series 2025-FL20, Class C | — | Mortgage / Securitized | 0.38% | $31.30M |
| Black Diamond CLO Ltd., Series 2019-2A, Class BR | — | Mortgage / Securitized | 0.37% | $31.02M |
| Booz Allen Hamilton, Inc. | — | Corporate Bonds | 0.37% | $30.76M |
| COMM Mortgage Trust, Series 2024-CBM, Class B | — | Mortgage / Securitized | 0.37% | $30.46M |
| New Hampshire Business Finance Authority, Series 2024 A | — | Municipal Bonds | 0.36% | $30.02M |
| Jane Street Group | — | Corporate Bonds | 0.36% | $29.90M |
| Provident Funding Mortgage Trust, Series 2025-5, Class A4 | — | Mortgage / Securitized | 0.36% | $29.82M |
| Paychex, Inc. | — | Corporate Bonds | 0.35% | $29.52M |
| CoreWeave, Inc. | — | Corporate Bonds | 0.35% | $29.37M |
| MF1 LLC, Series 2026-FL22, Class C | — | Mortgage / Securitized | 0.35% | $29.30M |
| First Industrial LP | — | Corporate Bonds | 0.35% | $29.17M |
| Venture 43 CLO Ltd., Series 2021-43A, Class CRR | — | Mortgage / Securitized | 0.35% | $28.90M |
| Charles Schwab Corp. (The) | — | Corporate Bonds | 0.34% | $28.17M |
| Nomura Holdings, Inc. | — | Corporate Bonds | 0.34% | $28.11M |
| Raven Acquisition Holdings LLC | — | Corporate Bonds | 0.34% | $28.11M |
| Performance Food Group, Inc. | — | Corporate Bonds | 0.34% | $27.89M |
| Massachusetts Development Finance Agency, Series 2026 B | — | Municipal Bonds | 0.34% | $27.89M |
| Nomura Holdings, Inc. | — | Corporate Bonds | 0.33% | $27.80M |
| Bain Capital Credit CLO Ltd., Series 2020-4A, Class BRR | — | Mortgage / Securitized | 0.33% | $27.73M |
| Regal Rexnord Corp. | — | Corporate Bonds | 0.33% | $27.66M |
| VZ Secured Financing BV | — | Corporate Bonds | 0.33% | $27.21M |
| Energy Transfer LP | — | Corporate Bonds | 0.33% | $27.20M |
| CBRE Services, Inc. | — | Corporate Bonds | 0.32% | $27.01M |
| OBX Trust, Series 2026-INV4, Class AF2 | — | Mortgage / Securitized | 0.32% | $26.94M |
| Trinitas CLO XV Ltd., Series 2021-15A, Class CR | — | Mortgage / Securitized | 0.32% | $26.85M |
| Salesforce, Inc. | — | Corporate Bonds | 0.32% | $26.82M |
| LoanCore Issuer LLC, Series 2025-CRE8, Class B | — | Mortgage / Securitized | 0.32% | $26.50M |
| Morgan Stanley Residential Mortgage Loan Trust, Series 2026-NQM2, Class A1 | — | Mortgage / Securitized | 0.32% | $26.38M |
| U.S. Treasury Bonds | — | Government Bonds | 0.31% | $26.02M |
| BDS LLC, Series 2025-FL16, Class B | — | Mortgage / Securitized | 0.31% | $25.97M |
| Regions Financial Corp. | — | Corporate Bonds | 0.31% | $25.69M |
| Snap, Inc. | — | Corporate Bonds | 0.31% | $25.68M |
| Northern Star Resources Ltd. | — | Corporate Bonds | 0.31% | $25.68M |
| SCIH Salt Holdings, Inc. | — | Corporate Bonds | 0.31% | $25.53M |
| Cheniere Energy Partners LP | — | Corporate Bonds | 0.30% | $25.16M |
| Dryden 104 CLO Ltd., Series 2022-104A, Class BR | — | Mortgage / Securitized | 0.30% | $25.08M |
| U.S. Treasury Bonds | — | Government Bonds | 0.30% | $25.02M |
| Eni SpA | — | Corporate Bonds | 0.30% | $24.96M |
| SMBC Aviation Capital Finance DAC | — | Corporate Bonds | 0.30% | $24.90M |
| Neptune Bidco US, Inc. | — | Corporate Bonds | 0.30% | $24.80M |
| SHR Trust, Series 2024-LXRY, Class B | — | Mortgage / Securitized | 0.30% | $24.79M |
| Alimentation Couche-Tard, Inc. | — | Corporate Bonds | 0.30% | $24.77M |
| Quikrete Holdings, Inc. | — | Corporate Bonds | 0.29% | $24.49M |
| Capital One Financial Corp. | — | Corporate Bonds | 0.29% | $24.35M |
| Bombardier, Inc. | — | Corporate Bonds | 0.29% | $24.08M |
| Boeing Co. (The) | — | Corporate Bonds | 0.29% | $24.07M |
| Patrick Industries, Inc. | — | Corporate Bonds | 0.29% | $24.05M |
| Oracle Corp. | — | Corporate Bonds | 0.29% | $23.91M |
| DCP Midstream Operating LP | — | Corporate Bonds | 0.29% | $23.89M |
| Arrow Electronics, Inc. | — | Corporate Bonds | 0.29% | $23.80M |
| PetSmart LLC | — | Corporate Bonds | 0.29% | $23.77M |
| Wells Fargo & Co. | — | Corporate Bonds | 0.29% | $23.71M |
| Neuberger Berman Loan Advisers CLO 35 Ltd., Series 2019-35A, Class CRR | — | Mortgage / Securitized | 0.28% | $23.66M |
| LPL Holdings, Inc. | — | Corporate Bonds | 0.28% | $23.65M |
| LRECS LLC, Series 2025-CRE1, Class B | — | Mortgage / Securitized | 0.28% | $23.60M |
| Six Flags Entertainment Corp. | — | Corporate Bonds | 0.28% | $23.57M |
| CRC Insurance Group LLC | — | Corporate Bonds | 0.28% | $23.53M |
| UBS Group AG | — | Corporate Bonds | 0.28% | $23.36M |
| Republic of South Africa | — | Government Bonds | 0.28% | $23.24M |
| Ford Motor Credit Co. LLC | — | Corporate Bonds | 0.28% | $23.19M |
| LLC, Series 2025-FL17, Class C | — | Mortgage / Securitized | 0.28% | $23.13M |
| Capital One Financial Corp. | — | Corporate Bonds | 0.28% | $22.91M |
MIOBX Sector Allocation
MFS Income Fund holdings grouped by sector, by share of the portfolio's market value.
| Sector | Weight | Holdings |
|---|---|---|
| Corporate Bonds | 42.0% | 259 |
| Mortgage / Securitized | 29.1% | 223 |
| Government Bonds | 26.2% | 35 |
| Municipal Bonds | 1.4% | 14 |
| Funds & ETFs | 1.2% | 1 |
| Cash & Currency | 0.0% | 1 |
| Unknown | 0.1% | 6 |
MIOBX Country Allocation
Where MFS Income Fund's holdings are domiciled, by percentage of net assets (largest 15).
| Country | % of net assets |
|---|---|
| United States | 75.4% |
| Cayman Islands | 9.2% |
| Australia | 1.7% |
| Canada | 1.6% |
| United Kingdom | 1.3% |
| Netherlands | 1.2% |
| Japan | 1.0% |
| Ireland | 0.9% |
| Jersey | 0.9% |
| Switzerland | 0.7% |
| Luxembourg | 0.6% |
| Mexico | 0.6% |
| Italy | 0.4% |
| India | 0.4% |
| Serbia | 0.4% |
MIOBX Portfolio Allocation
Asset-class allocation of MFS Income Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 69.5% |
| Securitized | 28.9% |
| Cash & Equivalents | 1.2% |
MIOBX Debt Constituents
Largest debt holdings of MFS Income Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States of America | 2.79% |
| United States of America | 2.72% |
| United States of America | 2.26% |
| United States of America | 2.13% |
| United States of America | 1.77% |
| United States of America | 1.72% |
| United States of America | 1.62% |
| United States of America | 1.54% |
| United States of America | 1.49% |
| United States of America | 1.27% |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.