Performance displayed represents past performance which is no guarantee of future results. Investment returns and principal value will fluctuate so that when shares are redeemed, they may be worth more or less than original cost. Current performance may be lower or higher than the performance data quoted. Returns for performance under one year are cumulative, not annualized. Load performance reflects maximum sales charges or contingent deferred sales charges (CDSC) as applicable. Class A-shares have a maximum sales charge of 4.00%. Effective 10/1/2015 the A-Class maximum front-end sales charge was changed from 4.75% to 4.00%. For performance periods that begin prior to 10/1/2015, a 4.75% load was used and for performance periods that begin after 10/1/2015, a 4.00% load was used. Class C-shares have a maximum CDSC of 1% for shares redeemed within 12 months of purchase. For additional information, see the fund's prospectus.

Data is subject to change on a daily basis. Partial year returns are cumulative, not annualized. Returns reflect the reinvestment of dividends.

¹Diversification neither assures a profit nor eliminates the risk of experiencing investment losses.

^†The annualized rate an investor would receive if the most recent fund distribution stayed the same going forward. This rate does not represent the total return of a fund.

^‡SEC 30-day yield is a standard yield calculation developed by the SEC that allows for fairer comparisons of bond funds. It reflects dividends and interest ("income") earned during the most recent 30-day period after the deduction of the fund’s expenses and is calculated by dividing the income per share by the maximum offering share price on the last day of the period. Unsubsidized SEC 30-day yield is what the yield would have been had no fee waivers and/or expense reimbursement been in place.

This fund may not be suitable for all investors. • The Fund’s market value will change in response to interest rate changes and market conditions among other factors. In general, bond prices rise when interest rates fall and vice versa. • The Fund’s exposure to high yield securities may subject the Fund to greater volatility. • The Fund may invest in derivative instruments, which may be more volatile and less liquid, increasing the risk of loss when compared to traditional securities. Certain of the derivative instruments are also subject to the risks of counterparty default and adverse tax treatment. •The Fund’s use of leverage, through borrowings or instruments such as derivatives, may cause the Fund to be more volatile than if it had not been leveraged. • Instruments and strategies (such as borrowing transactions and reverse repurchase agreements) may provide leveraged exposure to a particular investment, which will magnify any gains or losses on those investments. • The Fund may invest in foreign securities which carry additional risks when compared to U.S. securities, due to the impact of diplomatic, political or economic developments in the country in question (investments in emerging markets securities are generally subject to an even greater level of risks). • Investments in syndicated bank loans generally offer a floating interest rate and involve special types of risks. • The Fund’s investments in other investment vehicles subject the Fund to those risks and expenses affecting the investment vehicle. • The Fund’s investments in restricted securities may involve financial and liquidity risk. • You may have a gain or loss when you sell your shares. • It is important to note that the Fund is not guaranteed by the U.S. government. • Please read the prospectus for more detailed information regarding these and other risks.