MFBBX Fees and Costs — MFS Corporate Bond Fund, Class B
Data updated: 2026-09-28
The net expense ratio is 1.50%: a 0.38% management fee, a 1.00% 12b-1 fee plus 0.13% other expenses, less a 0.01% fee waiver. This share class carries a deferred sales charge of up to 4.00%. In fiscal 2026 the fund paid $121K in broker commissions, 0.0027% of average net assets, and portfolio turnover was 41%.
MFBBX Fees and Expenses
Annual operating expenses and sales charges of MFBBX. Prospectus, as of April 30, 2026.
| Annual operating expenses | |
|---|---|
| Management fee | 0.38% |
| 12b-1 fee | 1.00% |
| Other expenses | 0.13% |
| Gross expense ratio | 1.51% |
| Fee waiver | −0.01% |
| Net expense ratio | 1.50% |
| Sales charges | |
|---|---|
| Max front load | 0.00% |
| Max deferred load | 4.00% |
| Redemption fee | — |
| Expense limitation in place (N-CEN) | Yes |
| Fees waived or reduced during the year | Yes |
| Waived fees subject to recoupment | No |
MFBBX Costs Over Time
On $10,000 invested in MFBBX, assuming 5% a year before costs, total costs come to $931 over 5 years, cutting the return by 1.58% a year. Illustration, not a forecast: it assumes today's net expense ratio throughout (a fee waiver may end).
| $10,000 invested | Sell after 1 year | Sell after 3 years | Sell after 5 years |
|---|---|---|---|
| Value before costs | $10,500 | $11,576 | $12,763 |
| Sales charges | $414 | $0 | $0 |
| Fund expenses (net expense ratio 1.50%) | $158 | $489 | $843 |
| Trading costs (broker commissions) | $0 | $1 | $2 |
| Lost growth on money paid in costs | $0 | $24 | $86 |
| Total costs | $571 | $514 | $931 |
| Value after costs | $9,929 | $11,062 | $11,832 |
| Impact on return, per year | 5.71% | 1.58% | 1.58% |
MFBBX Trading Costs
Brokerage costs reported on SEC Form N-CEN for the fiscal year ending April 30, 2026.
- Explicit cost rate (commissions ÷ average net assets): 0.0027%
- Total broker commissions: $121K
- Bought from dealers (principal trades, not a cost): $3.5B
- Portfolio turnover (prospectus): 41%
- Securities lending: none during the year
MFBBX Agency Brokers
Commissions paid.
| Broker | Amount | Share |
|---|---|---|
| Merrill Lynch, Pierce, Fenner & Smith Inc. | $121K | 100.00% |
MFBBX Dealer Counterparties
Securities bought directly from dealers (principal trades).
| Broker | Amount | Share |
|---|---|---|
| J.P. Morgan Securities LLC | $461.5M | 18.81% |
| BofA Securities, Inc. | $401.9M | 16.38% |
| Goldman Sachs & Co. LLC | $364.0M | 14.83% |
| Morgan Stanley & Co. LLC | $323.8M | 13.20% |
| Barclays Capital, Inc. | $251.6M | 10.25% |
| Citigroup Global Markets Inc. | $213.2M | 8.69% |
| Wells Fargo Securities, LLC | $141.5M | 5.77% |
| Susquehanna Financial Group, LLLP | $104.6M | 4.26% |
| Deutsche Bank Securities Inc. | $96.8M | 3.95% |
| UBS Securities LLC | $94.8M | 3.86% |
MFS Corporate Bond Fund Share Classes
Net expense ratio and maximum front-end load of each share class, cheapest first.
| Ticker | Class | Net expense ratio | Front load |
|---|---|---|---|
| MFBKX | Class R6 | 0.41% | none |
| MBDIX | Class I | 0.50% | none |
| MFBJX | Class R4 | 0.50% | none |
| MFBFX | Class A | 0.75% | 4.25% |
| MFBHX | Class R3 | 0.75% | none |
| MBRRX | Class R2 | 1.00% | none |
| MFBBX | Class B | 1.50% | none |
| MFBCX | Class C | 1.50% | none |
| MFBGX | Class R1 | 1.50% | none |
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.