June 18, 2021 This distribution represents a per annum distribution rate of approximately 7.64% based on the market price of the Fund's shares of $12.56 as of the close of the New York Stock Exchange on May 19, 2021 and approximately 7.91% based on the Fund's net asset value (NAV) of $12.13 as of the same date. As was announced on May 20, 2021, the Fund's monthly distribution rate has been reduced by $0.02 per share in order to provide a distribution rate that is more sustainable in the current environment of historically low interest rates. Under the terms of its Managed Distribution Plan, the Fund will seek to maintain a consistent distribution level that may be paid in part or in full from net investment income and realized capital gains, or a combination thereof. Shareholders should note, however, that if the Fund's aggregate net investment income and net realized capital gains are less than the amount of the distribution level, the difference will be distributed from the Fund's assets and will constitute a return of the shareholder's capital. You should not draw any conclusions about the Fund's investment performance from the amount of this distribution or from the terms of the Fund's Managed Distribution Plan.