MFBKX Holdings — MFS Corporate Bond Fund
Data updated: 2026-09-28
MFBKX holds 430 securities. The top 10 make up 7.5% of net assets, led by MFS Institutional Money Market Portfolio, Class A (1.90%) and Boeing Co. (The) (0.76%). Corporate Bonds (91.7%) and Mortgage / Securitized (3.1%) are the largest sectors, and 70.5% of the portfolio is in United States. Debt holdings: 402 positions, 93.8% of assets.
Holdings cover 99.48% of net asset value (98.70% of total assets; remainder is cash and receivables). As of July 31, 2026 · N-PORT.
MFBKX Portfolio Holdings
430 holdings of MFS Corporate Bond 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 430.
| Holding | Ticker | Sector | % of net assets | Value (USD) |
|---|---|---|---|---|
| MFS Institutional Money Market Portfolio, Class A | — | Funds & ETFs | 1.90% | $82.67M |
| Boeing Co. (The) | — | Corporate Bonds | 0.76% | $33.03M |
| JPMorgan Chase & Co. | — | Corporate Bonds | 0.75% | $32.75M |
| UBS Group AG | — | Corporate Bonds | 0.74% | $32.33M |
| Pinnacle Financial Partners, Inc. | — | Corporate Bonds | 0.62% | $27.12M |
| Charles Schwab Corp. (The) | — | Corporate Bonds | 0.57% | $25.03M |
| Sumitomo Mitsui Financial Group, Inc. | — | Corporate Bonds | 0.57% | $24.92M |
| Morgan Stanley | — | Corporate Bonds | 0.57% | $24.79M |
| CaixaBank SA | — | Corporate Bonds | 0.53% | $23.04M |
| Royal Bank of Canada | — | Corporate Bonds | 0.52% | $22.46M |
| AIB Group plc | — | Corporate Bonds | 0.50% | $21.87M |
| American Homes 4 Rent LP | — | Corporate Bonds | 0.50% | $21.84M |
| UBS Group AG | — | Corporate Bonds | 0.50% | $21.58M |
| Spire, Inc. | — | Corporate Bonds | 0.49% | $21.29M |
| Bacardi Ltd. | — | Corporate Bonds | 0.48% | $20.83M |
| JPMorgan Chase & Co. | — | Corporate Bonds | 0.48% | $20.79M |
| Highwoods Realty LP | — | Corporate Bonds | 0.45% | $19.69M |
| Element Fleet Management Corp. | — | Corporate Bonds | 0.45% | $19.68M |
| Bank Hapoalim BM | — | Corporate Bonds | 0.45% | $19.67M |
| National Australia Bank Ltd. | — | Corporate Bonds | 0.45% | $19.46M |
| Paychex, Inc. | — | Corporate Bonds | 0.44% | $19.37M |
| Jane Street Group | — | Corporate Bonds | 0.44% | $19.26M |
| Mars, Inc. | — | Corporate Bonds | 0.44% | $19.19M |
| Maxam Prill Sarl | — | Corporate Bonds | 0.44% | $19.16M |
| Equitable America Global Funding | — | Corporate Bonds | 0.44% | $18.96M |
| SCIH Salt Holdings, Inc. | — | Corporate Bonds | 0.43% | $18.89M |
| TransDigm, Inc. | — | Corporate Bonds | 0.43% | $18.67M |
| Hilton Domestic Operating Co., Inc. | — | Corporate Bonds | 0.42% | $18.46M |
| Flutter Treasury DAC | — | Corporate Bonds | 0.42% | $18.29M |
| Icon Investments Six DAC | — | Corporate Bonds | 0.41% | $18.07M |
| Boston Gas Co. | — | Corporate Bonds | 0.41% | $17.88M |
| Sunoco LP | — | Corporate Bonds | 0.41% | $17.75M |
| Northern Star Resources Ltd. | — | Corporate Bonds | 0.40% | $17.58M |
| Citadel Securities Global Holdings LLC | — | Corporate Bonds | 0.40% | $17.42M |
| Mitsubishi UFJ Financial Group, Inc. | — | Corporate Bonds | 0.40% | $17.36M |
| Amazon.com, Inc. | — | Corporate Bonds | 0.40% | $17.27M |
| JPMorgan Chase & Co. | — | Corporate Bonds | 0.39% | $17.14M |
| Store Capital LLC | — | Corporate Bonds | 0.39% | $17.09M |
| Blue Owl Credit Income Corp. | — | Corporate Bonds | 0.39% | $16.90M |
| Targa Resources Corp. | — | Corporate Bonds | 0.39% | $16.88M |
| Nordea Bank Abp | — | Corporate Bonds | 0.38% | $16.72M |
| Eastern Energy Gas Holdings LLC | — | Corporate Bonds | 0.38% | $16.64M |
| ARDN Mortgage Trust, Series 2025-ARCP, Class A | — | Mortgage / Securitized | 0.38% | $16.39M |
| Ferguson Enterprises, Inc. | — | Corporate Bonds | 0.37% | $16.31M |
| Jersey Central Power & Light Co. | — | Corporate Bonds | 0.37% | $16.25M |
| LPL Holdings, Inc. | — | Corporate Bonds | 0.37% | $16.04M |
| LPL Holdings, Inc. | — | Corporate Bonds | 0.36% | $15.86M |
| CBRE Services, Inc. | — | Corporate Bonds | 0.36% | $15.83M |
| NTT Finance Corp. | — | Corporate Bonds | 0.36% | $15.80M |
| Cellnex Finance Co. SA | — | Corporate Bonds | 0.36% | $15.71M |
| WSP Global, Inc. | — | Corporate Bonds | 0.36% | $15.69M |
| Arrow Electronics, Inc. | — | Corporate Bonds | 0.36% | $15.60M |
| Japan Tobacco, Inc. | — | Corporate Bonds | 0.36% | $15.55M |
| Bermuda Government Bond | — | Government Bonds | 0.36% | $15.52M |
| HSBC Holdings plc | — | Corporate Bonds | 0.36% | $15.50M |
| Nationwide Building Society | — | Corporate Bonds | 0.35% | $15.45M |
| Boeing Co. (The) | — | Corporate Bonds | 0.35% | $15.37M |
| Charles Schwab Corp. (The) | — | Corporate Bonds | 0.35% | $15.20M |
| Carlyle Group, Inc. (The) | — | Corporate Bonds | 0.35% | $15.16M |
| Videotron Ltd. | — | Corporate Bonds | 0.35% | $15.12M |
| SMBC Aviation Capital Finance DAC | — | Corporate Bonds | 0.35% | $15.08M |
| Flutter Treasury DAC | — | Corporate Bonds | 0.35% | $15.09M |
| Anheuser-Busch InBev Worldwide, Inc. | — | Corporate Bonds | 0.35% | $15.08M |
| U.S. Treasury Bonds | — | Government Bonds | 0.35% | $15.05M |
| Salesforce, Inc. | — | Corporate Bonds | 0.34% | $15.00M |
| Stryker Corp. | — | Corporate Bonds | 0.34% | $14.96M |
| Carnival Corp. Ltd. | — | Corporate Bonds | 0.34% | $14.95M |
| Occidental Petroleum Corp. | — | Corporate Bonds | 0.34% | $14.83M |
| Deutsche Bank AG | — | Corporate Bonds | 0.34% | $14.82M |
| Automatic Data Processing, Inc. | — | Corporate Bonds | 0.34% | $14.68M |
| Thermo Fisher Scientific, Inc. | — | Corporate Bonds | 0.34% | $14.64M |
| Mars, Inc. | — | Corporate Bonds | 0.34% | $14.60M |
| Goldman Sachs Group, Inc. (The) | — | Corporate Bonds | 0.33% | $14.49M |
| Merck & Co., Inc. | — | Corporate Bonds | 0.33% | $14.37M |
| MF1, Series 2024-FL15, Class A | — | Mortgage / Securitized | 0.33% | $14.36M |
| Pioneer Natural Resources Co. | — | Corporate Bonds | 0.33% | $14.35M |
| Oracle Corp. | — | Corporate Bonds | 0.33% | $14.31M |
| Vodafone Group plc | — | Corporate Bonds | 0.33% | $14.28M |
| Abbott Laboratories | — | Corporate Bonds | 0.33% | $14.27M |
| Jacobs Solutions, Inc. | — | Corporate Bonds | 0.33% | $14.22M |
| Northwestern Mutual Life Insurance Co. (The) | — | Corporate Bonds | 0.33% | $14.21M |
| Alliant Holdings Intermediate LLC | — | Corporate Bonds | 0.32% | $14.14M |
| Mitsubishi UFJ Financial Group, Inc. | — | Corporate Bonds | 0.32% | $14.11M |
| SMBC Aviation Capital Finance DAC | — | Corporate Bonds | 0.32% | $14.06M |
| Jefferies Financial Group, Inc. | — | Corporate Bonds | 0.32% | $14.03M |
| AbbVie, Inc. | — | Corporate Bonds | 0.32% | $14.02M |
| Ontario Teachers' Cadillac Fairview Properties Trust | — | Corporate Bonds | 0.32% | $14.03M |
| Toronto-Dominion Bank (The) | — | Corporate Bonds | 0.32% | $14.02M |
| Western Midstream Operating LP | — | Corporate Bonds | 0.32% | $13.97M |
| Burlington Northern Santa Fe LLC | — | Corporate Bonds | 0.32% | $13.96M |
| Elevance Health, Inc. | — | Corporate Bonds | 0.32% | $13.89M |
| UnitedHealth Group, Inc. | — | Corporate Bonds | 0.32% | $13.83M |
| Comision Federal de Electricidad | — | Corporate Bonds | 0.32% | $13.78M |
| JPMorgan Chase & Co. | — | Corporate Bonds | 0.32% | $13.78M |
| Commonwealth Bank of Australia | — | Corporate Bonds | 0.32% | $13.75M |
| MidAmerican Energy Co. | — | Corporate Bonds | 0.32% | $13.75M |
| IAMGOLD Corp. | — | Corporate Bonds | 0.32% | $13.73M |
| Stellantis Financial Services US Corp. | — | Corporate Bonds | 0.32% | $13.72M |
| Experian Finance US, Inc. | — | Corporate Bonds | 0.31% | $13.67M |
| Eni SpA | — | Corporate Bonds | 0.31% | $13.65M |
MFBKX Sector Allocation
MFS Corporate Bond Fund holdings grouped by sector, by share of the portfolio's market value.
| Sector | Weight | Holdings |
|---|---|---|
| Corporate Bonds | 91.7% | 387 |
| Mortgage / Securitized | 3.1% | 21 |
| Government Bonds | 2.6% | 11 |
| Funds & ETFs | 1.9% | 1 |
| Municipal Bonds | 0.4% | 2 |
| Cash & Currency | 0.0% | 1 |
| Unknown | 0.4% | 7 |
MFBKX Country Allocation
Where MFS Corporate Bond Fund's holdings are domiciled, by percentage of net assets (largest 15).
| Country | % of net assets |
|---|---|
| United States | 70.5% |
| Canada | 4.6% |
| Ireland | 2.7% |
| Australia | 2.6% |
| Japan | 2.3% |
| United Kingdom | 2.3% |
| Cayman Islands | 1.8% |
| Switzerland | 1.7% |
| Mexico | 1.7% |
| Netherlands | 1.5% |
| Bermuda | 1.3% |
| Luxembourg | 1.1% |
| Germany | 1.1% |
| Spain | 0.9% |
| India | 0.6% |
MFBKX 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 | 94.6% |
| Securitized | 3.0% |
| Cash & Equivalents | 1.9% |
MFBKX 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 |
|---|---|
| Boeing Co. (The) | 0.76% |
| JPMorgan Chase & Co. | 0.75% |
| UBS Group AG | 0.74% |
| Pinnacle Financial Partners, Inc. | 0.62% |
| Charles Schwab Corp. (The) | 0.57% |
| Sumitomo Mitsui Financial Group, Inc. | 0.57% |
| Morgan Stanley | 0.57% |
| CaixaBank SA | 0.53% |
| Royal Bank of Canada | 0.52% |
| AIB Group plc | 0.50% |
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.