BlackRock Municipal Credit Alpha Portfolio, Inc. is a diversified, closed end management investment company registered under the Investment Company Act of 1940, as amended (the “Investment Company Act”), and is operated as an “interval fund” (as defined below).

Effective March 24, 2025, the Fund converted from as a registered closed end management investment company listed on the New York Stock Exchange (“NYSE”) to an unlisted, continuously offered “interval fund” (the “Conversion”).

Throughout this prospectus, we refer to BlackRock Municipal Credit Alpha Portfolio, Inc. simply as the “Fund” or as “we,” “us” or “our.” See “The Fund” in the prospectus

The Fund continuously offers three classes of shares of common stock (“Shares”) of the Fund: Institutional Shares, Class A Shares, and Class U Shares. The Fund has received exemptive relief from the Securities and Exchange Commission (“SEC”) to, among other things, issue multiple classes of Shares and to impose asset-based distribution fees and early-withdrawal fees as applicable (the “Multi-Class Exemptive Relief”). The Fund may offer other additional classes of Shares in the future with fees and expenses that differ from the classes of Shares described in this prospectus.

The Fund is an “interval fund,” a type of fund which, in order to provide liquidity to shareholders, has adopted a fundamental investment policy to make quarterly offers to repurchase between 5% and 25% of its outstanding Shares at net asset value (“NAV”), reduced by any applicable repurchase fee. The Fund’s Board of Directors (the “Board,” and each of the directors on the Board, a “Director”) has approved a quarterly repurchase offer amount of 7.5% of outstanding Shares at NAV for the Fund’s quarterly repurchase offers through the end of 2026. For quarterly repurchase offers commencing in 2027, subject to applicable law and approval of the Board, the Fund currently expects to offer to repurchase at least 7.5% of outstanding Shares at NAV. It is possible that a repurchase offer may be oversubscribed, with the result that shareholders may only be able to have a portion of their Shares repurchased. Affiliates of the Fund may own Shares and determine to participate in the Fund’s repurchase offers, which may contribute to a repurchase offer being oversubscribed and the Fund effecting repurchases on a pro rata basis. There is no assurance that you will be able to tender your Shares when or in the amount that you desire.

Written notification of each quarterly repurchase offer (the “Repurchase Offer Notice”) will be sent to shareholders at least 21 and not more than 42 calendar days before the repurchase request deadline (i.e., the date by which shareholders can tender their Shares in response to a repurchase offer) (the “Repurchase Request Deadline”). The Fund’s Shares are not listed on any securities exchange, and the Fund anticipates that no secondary market will develop for its Shares. Accordingly, you may not be able to sell Shares when and/or in the amount that you desire. Investors should consider Shares of the Fund to be an illiquid investment. Thus, the Shares are appropriate only as a long-term investment. In addition, the Fund’s repurchase offers may subject the Fund and shareholders to special risks. See “Risks—Repurchase Offers Risk” in the prospectus.

The Fund’s investment objective is to provide attractive after tax total return, through income and capital appreciation.

There can be no assurances that the Fund’s investment objective will be achieved or that the Fund’s investment program will be successful. The Fund is not intended as, and you should not construe it to be, a complete investment program. Investors should consider their investment goals, time horizons and risk tolerance before investing in the Fund. The Fund’s investment objective is a fundamental policy of the Fund that may not be changed without the vote of a majority of the outstanding voting securities of the Fund. The “vote of a majority of the outstanding voting securities” means the vote, at a meeting of shareholders, (1) of 67% or more of the voting securities present at the meeting, if the holders of more than 50% of the outstanding voting securities of the Fund are present or represented by proxy, or (2) of more than 50% of the outstanding voting securities of the Fund, whichever is less.

The Fund seeks to achieve its investment objective by investing at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal securities and other investments, the income of which is exempt from federal income taxes (except that the interest may be subject to the federal alternative minimum tax) (“Municipal Bonds”). The Fund’s investments in derivatives will be counted toward the Fund’s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more market risk factors associated with such securities. The Fund’s policy of investing at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in Municipal Bonds is a fundamental policy that may not be changed without the vote of a majority of the outstanding voting securities (as defined above) of the Fund.

The Fund may invest in certain tax exempt securities classified as “private activity bonds” (or industrial development bonds, under pre

1986 law) (“PABs”) (in general, bonds that benefit non‑governmental entities) that may subject certain investors in the Fund to an alternative minimum tax. The percentage of the Fund’s total assets invested in PABs will vary from time to time. The Fund has not established any limit on the percentage of its portfolio that may be invested in PABs. The Fund expects that a portion of the interest or income it produces will be includable in alternative minimum taxable income.

Under normal circumstances, the Fund will invest at least 75% of its assets in municipal bonds that are rated in the medium to lower categories by nationally recognized rating services (for example, Baa or lower by Moody’s Investors Service, Inc. (“Moody’s”) or BBB or lower by S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or non‑rated securities which are of comparable quality in the opinion of BlackRock Advisors, LLC (the “Advisor”). For temporary periods due to market conditions or to ensure sufficient liquidity for repurchase or tender offers, the Fund may invest less than 75% of its assets in such municipal bonds.

The Fund may invest without limit in Municipal Bonds that are rated below Baa by Moody’s or below BBB by S&P or Fitch or, if unrated, are considered by the Advisor to possess similar credit characteristics. Such securities, sometimes referred to as “high yield” or “junk” bonds, are predominantly speculative with respect to the capacity to pay interest and repay principal in accordance with the terms of the security and generally involve a greater volatility of price than securities in higher rating categories. The Fund may purchase Municipal Bonds that are in default or which the Advisor believes will soon be in default. Below investment grade securities and comparable unrated securities involve substantial risk of loss, are considered speculative with respect to the issuer’s ability to pay interest and any required redemption or principal payments and are susceptible to default or decline in market value due to adverse economic and business developments.

The Fund may invest 25% or more of its total assets in tax exempt securities of issuers in the industries comprising the same economic sector, such as hospitals or life care facilities and transportation-related issuers. However, the Fund will not invest 25% or more of its total assets in any one of the industries comprising an economic sector. In addition, a substantial part of the Fund’s portfolio may be comprised of securities credit enhanced by banks, insurance companies or companies with similar characteristics. Emphasis on these sectors may subject the Fund to certain risks.

The value of bonds and other fixed-income obligations may fall when interest rates rise and rise when interest rates fall. In general, bonds and other fixed-income obligations with longer maturities will be subject to greater volatility resulting from interest rate fluctuations

than will similar obligations with shorter maturities. “Duration” measures the sensitivity of a security’s price to changes in interest rates. Unlike final maturity, duration takes account of all payments made over the life of the security. Typically, with a 1% change in interest rates, an investment’s value may be expected to move in the opposite direction approximately 1% for each year of its duration. The greater a portfolio’s duration, the greater the change in the portfolio’s value in response to changes in interest rates. The Advisor increases or reduces the Fund’s portfolio duration based on its interest rate outlook. When the Advisor expects interest rates to fall, it attempts to maintain a longer portfolio duration. When the Advisor expects interest rates to increase, it attempts to shorten the portfolio’s duration. Generally, as is the case with any investment grade fixed-income obligations, Municipal Bonds with longer maturities tend to produce higher yields. Under normal market conditions, however, such yield to maturity increases tend to decline in the longer maturities (i.e., the slope of the yield curve flattens). At the same time, due to their longer exposure to interest rate risk, prices of longer term obligations are subject to greater market fluctuations as a result of changes in interest rates.

For temporary periods or to provide liquidity, the Fund has the authority to invest as much as 20% of its total assets in tax exempt and taxable money market obligations with a maturity of one year or less (such short-term obligations being referred to herein as “Temporary Investments”). In addition, the Fund reserves the right as a defensive measure to invest temporarily a greater portion of its assets in Temporary Investments, when, in the opinion of the Advisor, prevailing market or financial conditions warrant. Taxable money market obligations will yield taxable income.

The Fund also may invest in variable rate demand obligations (“VRDOs”) and VRDOs in the form of participation interests (“Participating VRDOs”) in variable rate tax exempt obligations held by a financial institution. The Fund’s hedging strategies are not fundamental policies and may be modified by the Fund’s Board of Directors (the “Board”) without the approval of the Fund’s stockholders. The Fund is also authorized to invest in indexed and inverse floating obligations for hedging purposes and to seek to enhance return.

Certain Municipal Bonds may be entitled to the benefits of letters of credit or similar credit enhancements issued by financial institutions. In such instances, the Board and the Advisor will take into account, in assessing the quality of such bonds, both the creditworthiness of the issuer of such bonds and the creditworthiness of the financial institution that provides the credit enhancement.

The Fund may also invest in privately placed or restricted securities (including in Rule 144A securities, which are privately placed

securities purchased by qualified institutional buyers), illiquid investments and investments in which no secondary market is readily available, including those of private companies.

The Fund may invest in securities not issued by or on behalf of a state or territory or by an agency or instrumentality thereof, if the Fund receives an opinion of counsel to the issuer that such securities pay interest that is excludable from gross income for federal income tax purposes (“Non Municipal Tax exempt Securities”). Non Municipal Tax exempt Securities could include trust certificates, partnership interests or other instruments evidencing interest in one or more long-term Municipal Bonds. Non‑Municipal Tax exempt Securities also may include securities issued by other investment companies that invest in Municipal Bonds, to the extent such investments are permitted by the Fund’s investment restrictions and applicable law. Non Municipal Tax exempt Securities are subject to the same risks associated with an investment in Municipal Bonds as well as many of the risks associated with investments in derivatives. While the Fund receives opinions of legal counsel to the effect that the income from the Non Municipal Tax exempt Securities in which the Fund invests is excludable from gross income for federal income tax purposes to the same extent as the underlying Municipal Bonds, the Internal Revenue Service (“IRS”) has not issued a ruling on this subject. Were the IRS to issue an adverse ruling or take an adverse position with respect to the taxation of these types of securities, there is a risk that the interest paid on such securities would be deemed taxable at the federal level.

The Fund ordinarily does not intend to realize significant investment income not exempt from federal income tax. From time to time, the Fund may realize taxable capital gains. Interest received on certain otherwise tax exempt securities that are classified as “private activity bonds” (in general, bonds that benefit non‑governmental entities) may be subject to a federal alternative minimum tax. The percentage of the Fund’s total assets invested in “private activity bonds” will vary from time to time. Federal tax legislation has limited the types and volume of bonds the interest on which qualifies for a federal income tax exemption. As a result, this legislation and legislation that may be enacted in the future may affect the availability of Municipal Bonds for investment by the Fund.

There is no guarantee that a shareholder’s investment in the Fund will not lose money or that the Fund will not return less over the life of the Fund than such shareholder’s initial investment.

Unless otherwise stated herein or in the SAI, the Fund’s investment policies are non‑fundamental policies and may be changed by the Board without prior shareholder approval. Unless otherwise expressly stated in this prospectus or the SAI, or otherwise required by applicable law, all percentage and ratings or credit quality limitations

stated in this prospectus apply only at the time of investment and subsequent changes in percentage (including changes resulting from the Fund having a smaller base of assets after a repurchase offer), value, ratings downgrades, liquidity profile or changes in credit quality will not result in the Fund being required to dispose of any portfolio security.

For a discussion of risk factors that may affect the Fund’s ability to achieve its investment objective, see “Risks” in the prospectus.

The Fund currently intends to use leverage to seek to achieve its investment objective.

The Fund’s use of leverage may increase or decrease from time to time in its discretion, and the Fund may, in the future, determine not to use leverage. The Fund currently utilizes leverage for investment purposes through the use of shares of preferred stock (“Preferred Shares”) and by investing in leveraged residual certificates issued by tender option bond (“TOB”) trusts (“TOB Residuals”). Under the Investment Company Act, the Fund is permitted to issue Preferred Shares in an amount up to 50% of its Managed Assets (100% of its net assets), borrow money (including by investing in TOB Residuals) or issue debt securities in an amount up to 33 1/3% of its Managed Assets (50% of its net assets) and enter into derivative instruments with leverage embedded in them in a limited manner or subject to a limit on leverage risk calculated based on value-at-risk, as required by Rule 18f-4 under the Investment Company Act. Although it has no present intention to do so, the Fund reserves the right to borrow money from banks or other financial institutions, or issue debt securities, in the future if it believes that market conditions would be conducive to the successful implementation of a leveraging strategy through borrowing money or issuing debt securities. The use of leverage creates an opportunity for increased common share net investment income dividends, but also creates risks for the holders of Shares. “Managed Assets” means the total assets of the Fund (including any assets attributable to money borrowed for investment purposes) minus the sum of the Fund’s accrued liabilities (other than money borrowed for investment purposes). See “Leverage” in the prospectus.

The Fund has leveraged its portfolio by issuing Variable Rate Demand Preferred Shares, par value $0.10 per share and with a liquidation preference of $100,000 per share (“VRDP Shares”). Under the Investment Company Act, the Fund is not permitted to issue Preferred Shares if, immediately after such issuance, the liquidation value of the Fund’s outstanding Preferred Shares exceeds 50% of its assets (including the proceeds from the issuance) less liabilities other than borrowings (i.e., the value of the Fund’s assets must be at least 200% of the liquidation value of its outstanding Preferred Shares). In addition, the Fund would not be permitted to declare any cash

dividend or other distribution on its common shares unless, at the time of such declaration, the value of the Fund’s assets less liabilities other than borrowings is at least 200% of such liquidation value. See “Leverage—Preferred Shares.”

As part of its leverage strategy, the Fund may invest in TOB Residuals. The TOB Residuals in which the Fund invests pay interest or income that, in the opinion of counsel to the issuer, is exempt from regular federal income tax. The Advisor will not conduct its own analysis of the tax status of the interest or income paid by TOB Residuals held by the Fund, but will rely on the opinion of counsel to the issuer. Although volatile, TOB Residuals typically offer the potential for yields exceeding the yields available on fixed rate municipal bonds with comparable credit quality, coupon, call provisions and maturity. See “Leverage—Tender Option Bond Transactions.”

The use of leverage is subject to numerous risks and will cause the Fund’s NAV and the yield to holders of Shares to be more volatile than if leverage was not used. For example, if short-term interest rates continue to rise, they may reach a level at which those rates exceed the return earned on securities purchased with leverage, which would result in a reduced yield and cause the Fund’s NAV to decline more than if the Fund had not used leverage. No assurance can be given that the Fund’s use of leverage will in any particular circumstance be possible or successful or that the Fund’s use of leverage will result in a higher yield to holders of Shares. See “Risks—Leverage Risk” in the prospectus.

The Fund’s investment adviser is BlackRock Advisors, LLC.

The Advisor is a subsidiary of BlackRock, Inc. (“BlackRock”). The Advisor receives an annual fee, payable monthly, in an amount equal to 0.90% of the average daily value of the Fund’s net assets.

The Advisor has contractually agreed, effective as of December 1, 2025, to waive the entirety of its management fee otherwise payable by the Fund through June 30, 2026.

The Fund declares distributions on a monthly basis. The Fund distributes all or a portion of its net investment income to holders of Shares. The Fund distributes all or a portion of its net investment income, after payment of dividends on the Fund’s VRDP Shares outstanding, to holders of Shares. Distributions may also include net realized capital gains. The Fund pays any capital gains distributions at least annually. In addition, the Fund may pay a special distribution at the end of the calendar year if necessary to comply with applicable law. See “Distributions” in this prospectus.

Various factors will affect the level of the Fund’s income, including the asset mix, the average maturity of the Fund’s portfolio and the Fund’s use of hedging. To permit the Fund to maintain more stable monthly distributions, the Fund may from time to time distribute more or less than the entire amount of income earned in a particular period. Any undistributed income would be available to supplement future distributions. As a result, the distributions paid by the Fund for any particular monthly period may be more or less than the amount of income actually earned by the Fund during that period. Undistributed income will add to the Fund’s NAV (and indirectly benefits the Advisor by increasing its fee) and, correspondingly, distributions from undistributed income will reduce the Fund’s NAV.

Shareholders will automatically have all dividends and distributions reinvested in Shares of the Fund in accordance with the Fund’s dividend reinvestment plan, unless an election is made to receive cash by contacting the Reinvestment Plan Agent (as defined herein). All correspondence concerning the Reinvestment Plan should be directed to the Reinvestment Plan Agent, in writing to: BlackRock Funds, C/O BNY Mellon Investment Servicing (U.S.) Inc., PO Box 534429, Pittsburgh, PA 15253-4429. Overnight correspondence should be directed to the Reinvestment Plan Agent at: BlackRock Funds, C/O BNY Mellon Investment Servicing, 500 Ross Street 154 0520, Pittsburgh, PA 15262. See “Dividend Reinvestment Plan” in the prospectus.

The Fund reserves the right to change its distribution policies and the basis for establishing the rate of its monthly distribution declarations at any time and may do so without prior notice to common shareholders. See “Distributions” in the prospectus.

As discussed above, the Fund has received the Multi-Class Exemptive Relief, which permits the Fund to, among other things, issue multiple classes of Shares and to impose asset-based distribution fees and early-withdrawal fees as applicable. The Fund currently offers three classes of Shares: Institutional Shares, Class A Shares, and Class U Shares. The Fund may in the future register and include other classes of Shares in the offering.

The Shares are offered on a daily basis. Shares are being offered through BlackRock Investments, LLC (the “Distributor”) at an offering price equal to the then-current NAV of the applicable class, plus, with respect to Class A Shares, the applicable sales load. The Distributor or Dealers (as defined below) may waive all or a portion of the sales load for certain classes of investors. If you buy Shares through certain selling agents or other financial intermediaries, they may directly charge you a transaction fee in such amount as they may determine. Any such fees will be in addition to your investment in the Fund and not deducted therefrom. Investors should consult with their selling agents or other financial intermediaries about any transaction

or other fees their selling agents or other financial intermediaries might impose on each class of shares. Generally, the stated minimum initial investment by an investor in the Fund is $100,000 for Institutional Shares, $1,000 for Class A Shares, $2,500 for Class U Shares. For Institutional Shares, the minimum initial investment is waived or reduced for certain eligible investors as described under “Plan of Distribution—Minimum Investments.” The minimum initial investment for each class of Shares may be modified or waived by the Fund and the Distributor for the Directors and certain employees of BlackRock, including its affiliates, vehicles controlled by such Directors and employees and their extended family members. There is no minimum subsequent investment for the Shares. See “Plan of Distribution” in the prospectus.

The Fund’s Shares outstanding immediately prior to the Conversion were redesignated as Institutional Shares effective upon the Conversion. Accordingly, shareholders of the Fund who held Shares of the Fund immediately prior to the Conversion (“Pre Conversion Shareholders”) held Institutional Shares of the Fund immediately following the Conversion, regardless of whether they met the eligibility requirements for Institutional Shares at the time of the Conversion. Although the eligibility requirements of Institutional Shares were waived for Pre Conversion Shareholders in connection with the Conversion, any additional purchases of the Fund by a Pre Conversion Shareholder following the Conversion will be subject to the terms and conditions in of the Shares in this prospectus, including share class eligibility requirements. Therefore, although Pre‑Conversion Shareholders held Institutional Shares of the Fund immediately following the Conversion, they may not be eligible to purchase additional Institutional Shares in the future but may be eligible to purchase Class A Shares or Class U Shares of the Fund.

Institutional Shares are not subject to a distribution or shareholder servicing fee. Class A Shares and Class U Shares are subject to an ongoing Distribution and Servicing Fee to compensate financial industry professionals for distribution-related expenses, if applicable, and providing ongoing services in respect of clients who own Shares of the Fund. Under the terms of the Multi-Class Exemptive Relief, the Fund is subject to Rule 12b‑1 under the Investment Company Act. The Fund has adopted a distribution and servicing plan (the “Distribution and Servicing Plan”) and pays the Distribution and Servicing Fee under such plan. The Distribution and Servicing Plan operates in a manner consistent with Rule 12b‑1 under the Investment Company Act, which regulates the manner in which an open end investment company may directly or indirectly bear the expenses of distributing its shares. The maximum annual rates at which the Distribution and Servicing Fees may be paid under the Distribution and Servicing Plan (calculated as a percentage of the Fund’s average

daily net assets attributable to each of the Class A Shares and Class U Shares) is 0.75%. 0.25% of such fee is a shareholder servicing fee and the remaining portion is a distribution fee.

BlackRock Investments, LLC, an affiliate of the Fund and the Advisor, acts as distributor for the Shares and serves in that capacity on a reasonable best efforts basis, subject to various conditions. The principal business address of the Distributor is 50 Hudson Yards, New York, NY 10001. The Shares are offered for sale through the Distributor at NAV, plus, with respect to Class A Shares, the applicable sales load. The Distributor may appoint additional selling agents (each a “Dealer”) or other financial intermediaries through which investors may purchase Shares. Dealers or other financial intermediaries may impose terms and conditions on investor accounts and investments in the Fund that are in addition to the terms and conditions set forth in this prospectus. Any terms and conditions imposed by a Dealer or other financial intermediary, or operational limitations applicable to such parties, may affect or limit a shareholder’s ability to purchase the Shares or tender the Shares for repurchase, or otherwise transact business with the Fund. Dealers typically receive the sales load with respect to Class A Shares purchased by their clients. Institutional Shares and Class U Shares are not subject to a sales load; however, investors may be required to pay brokerage commissions on purchases or sales of Institutional Shares to their Dealers. If you buy Shares through certain Dealers or other financial intermediaries, they may directly charge you a transaction fee in such amount as they may determine. Investors should consult with their Dealers or other financial intermediaries about any transaction or other fees their Dealers or other financial intermediaries might impose on each class of Shares in addition to any fees imposed by the Fund.

Institutional Shares are not subject to the Distribution and Servicing Fee but are only available through the Distributor or an asset-based fee program sponsored by a registered broker-dealer or registered investment adviser (also known as a “wrap fee” program) that has an agreement with the Distributor. With respect to Class A Shares and Class U Shares, the Fund will pay the Distributor the Distribution and Servicing Fee.

Additionally, the Advisor or its affiliates, in the Advisor’s discretion and from its own resources, may pay additional compensation to Dealers in connection with the sale of Shares (the “Additional Compensation”). In return for the Additional Compensation, the Fund may receive certain marketing advantages including but not limited to access to a broker’s or dealer’s registered representatives, placement on a list of investment options offered by a broker or dealer, or the ability to assist in training and educating the broker’s or dealer’s registered representatives. The Additional Compensation may differ among brokers or dealers in amount or in the amount of calculation.

Payments of Additional Compensation may be fixed dollar amounts or, based on the aggregate value of outstanding Shares held by common shareholders introduced by the broker or dealer, or determined in some other manner. The receipt of Additional Compensation by a selling broker or dealer may create potential conflicts of interest between an investor and its broker or dealer who is recommending the Fund over other potential investments. See “Plan of Distribution” in this prospectus.

The Shares are not listed on any securities exchange. The Fund is designed for long-term investors and an investment in the Shares, unlike an investment in a traditional listed closed end fund, should be considered illiquid. An investment in the Shares is not suitable for investors who need access to the money they invest and investors should provide for adequate liquidity outside of their investment in the Fund to meet their foreseeable liquidity needs. Before making an investment decision, an investor and/or its adviser should (i) consider the suitability of this investment with respect to its investment objectives and personal situation and (ii) consider factors such as its personal net worth, income, age, risk tolerance, and liquidity needs. Short-term investors and investors who cannot bear the loss of some or all of their investment and/or the risks associated with a lack of liquidity should not invest in the Fund. Unlike shares of open end funds (commonly known as mutual funds), which generally are redeemable on a daily basis, the Shares are not redeemable at an investor’s option, and unlike traditional listed closed end funds the Shares are not listed on any securities exchange. Notwithstanding that the Fund conducts periodic repurchase offers, investors should not expect to be able to sell their Shares when and/or in the amount desired regardless of how the Fund performs. See “Closed End Fund Structure” in this prospectus.

State Street Bank and Trust Company serves as the Fund’s custodian, and BNY Mellon Investment Servicing (US) Inc. serves as the Fund’s transfer agent.

State Street Bank and Trust Company serves as the Fund’s administrator and fund accountant.

An investment in the Shares of the Fund involves risk. You should consider carefully the risks summarized below, each of which is described in more detail under “Risks” beginning on page 72 of this prospectus.

Closed End Interval Fund; Illiquidity of Shares. The Fund is structured as an “interval fund” and designed primarily for long-term investors. An investment in the Shares, unlike an investment in a traditional listed closed end fund, should be considered illiquid. The Shares are appropriate only for investors who are seeking an investment in less liquid or illiquid portfolio investments within an

illiquid fund. An investment in the Shares is not suitable for investors who need access to the money they invest and investors should provide for adequate liquidity outside of their investment in the Fund to meet their foreseeable liquidity needs. Before making an investment decision, an investor and/or its adviser should (i) consider the suitability of this investment with respect to its investment objectives and personal situation and (ii) consider factors such as its personal net worth, income, age, risk tolerance, and liquidity needs. Short-term investors and investors who cannot bear the loss of some or all of their investment and/or the risks associated with a lack of liquidity should not invest in the Fund. Unlike open end funds (commonly known as mutual funds), which generally permit redemptions on a daily basis, the Shares are not redeemable at an investor’s option. Unlike traditional listed closed end funds, the Shares are not listed for trading on any securities exchange, and the Fund does not expect any secondary market to develop for the Shares in the foreseeable future. The NAV of the Shares may be volatile and the Fund’s use of leverage will increase this volatility. As the Shares are not traded, investors may not be able to dispose of their investment in the Fund when or in the amount desired, no matter how the Fund performs.

Although the Fund, as a fundamental policy, makes quarterly offers to repurchase between 5% and 25% of its outstanding Shares at NAV, the number of Shares tendered in connection with a repurchase offer may exceed the number of Shares the Fund has offered to repurchase, in which case the Fund may not repurchase all of your Shares tendered in that offer. In connection with any given repurchase offer, it is possible that the Fund may offer to repurchase only the minimum amount of 5% of its outstanding Shares. Hence, you may not be able to sell your Shares when and/or in the amount that you desire.

Investment Risk. An investment in the Fund’s Shares is subject to investment risk, including the possible loss of the entire amount that you invest. The Shares are designed for long-term investors, and the Fund should not be treated as a trading vehicle. At any point in time an investment in the Fund’s Shares may be worth less than the original amount invested, even after taking into account distributions paid by the Fund. During periods in which the Fund may use leverage, the Fund’s investment and certain other risks will be magnified.

Repurchase Offers Risk. As described under “Periodic Repurchase Offers,” the Fund is an “interval fund” and, to provide some liquidity to shareholders, makes quarterly offers to repurchase between 5% and 25% of its outstanding Shares at NAV, pursuant to Rule 23c‑3 under the Investment Company Act. The Fund believes that these repurchase offers are generally beneficial to the Fund’s shareholders. Repurchase offers generally are funded from available cash or sales of portfolio securities but may be funded with borrowings. However,

the repurchase of Shares by the Fund decreases the assets of the Fund and, therefore, may have the effect of increasing the Fund’s expense ratio. Repurchase offers and the need to fund repurchase obligations may also affect the ability of the Fund to be fully invested or force the Fund to maintain a higher percentage of its assets in liquid investments, which may harm the Fund’s investment performance. Moreover, diminution in the size of the Fund through repurchases may result in untimely sales of portfolio securities, and may limit the ability of the Fund to participate in new investment opportunities. If the Fund uses leverage, repurchases of Shares may compound the adverse effects of leverage in a declining market. In addition, if the Fund borrows money to finance repurchases, interest on that borrowing will negatively affect shareholders who do not tender their Shares by increasing Fund expenses and reducing any net investment income. Certain shareholders may from time to time own or control a significant percentage of the Fund’s Shares. Repurchase requests by these shareholders of these Shares of the Fund may cause repurchases to be oversubscribed, with the result that shareholders may only be able to have a portion of their Shares repurchased in connection with any repurchase offer. If a repurchase offer is oversubscribed and the Fund determines not to repurchase additional Shares beyond the repurchase offer amount, or if shareholders tender an amount of Shares greater than that which the Fund is entitled to purchase, the Fund will repurchase the Shares tendered on a pro rata basis, and shareholders will have to wait until the next repurchase offer to make another repurchase request. Shareholders will be subject to the risk of NAV fluctuations during that period. Thus, there is also a risk that some shareholders, in anticipation of proration, may tender more Shares than they wish to have repurchased in a particular quarterly period, thereby increasing the likelihood that proration will occur. Affiliates of the Fund may own Shares and determine to participate in the Fund’s repurchase offers, which may contribute to a repurchase offer being oversubscribed and the Fund effecting repurchases on a pro rata basis. The NAV of Shares tendered in a repurchase offer may fluctuate between the date a shareholder submits a repurchase request and the Repurchase Request Deadline, and to the extent there is any delay between the Repurchase Request Deadline and the Repurchase Pricing Date. The NAV on the Repurchase Request Deadline or the Repurchase Pricing Date may be higher or lower than on the date a shareholder submits a repurchase request. See “Periodic Repurchase Offers” in the prospectus.

Distribution Payment Risk. The Fund cannot assure investors that the Fund will achieve investment results that will allow the Fund to make a specified level of cash distributions or year to year increases in cash distributions. All distributions will be paid at the discretion of the Board and may depend on the Fund’s earnings, the Fund’s net investment income, the Fund’s financial condition, maintenance of the Fund’s RIC status, compliance with applicable regulations and such other factors as

the Board may deem relevant from time to time. Shareholders should not assume that the source of distributions will be net profits.

In the event that the Fund encounters delays in locating suitable investment opportunities, all or a substantial portion of the Fund’s distributions may constitute a return of capital to shareholders. To the extent that the Fund pays distributions that constitute a return of capital for U.S. federal income tax purposes, it will lower an investor’s tax basis in his or her Shares. A return of capital generally is a return of an investor’s investment, rather than a return of earnings or gains derived from the Fund’s investment activities, and generally results in a reduction of the tax basis in the Shares. As a result from such reduction in tax basis, shareholders may be subject to tax in connection with the sale of Fund Shares, even if such Shares are sold at a loss relative to the shareholder’s original investment.

Effect of Additional Subscriptions. The Fund intends to accept additional subscriptions for Shares, and such subscriptions will dilute the interest of existing shareholders in the Fund’s investment portfolio, which could have an adverse impact on the value of existing shareholders’ Shares.

Purchase Price Risk. The purchase price at which an investor purchases Shares will be determined as of the close of the regular trading session on the New York Stock Exchange (the “NYSE”) on each business day on which the NYSE is open for trading (“daily closing”) and will equal the NAV per Common Share of the applicable class as of such date, plus, with respect to Class A Shares, the applicable sales load. As a result, in the event of an increase in the Fund’s NAV per Common Share of an applicable class, an investor’s purchase price may be higher than the prior daily closing price per Common Share of the applicable class, and therefore an investor may receive fewer Shares than if an investor had subscribed at the prior daily closing price.

Best-Efforts Offering Risk. This offering is being made on a reasonable best efforts basis, whereby the Distributor is only required to use its reasonable best efforts to sell the Shares and neither it nor any Dealer has a firm commitment or obligation to purchase any of the Shares. To the extent that less than the maximum number of Shares is subscribed for, the opportunity for the allocation of the Fund’s investments among various issuers and industries may be decreased, and the returns achieved on those investments may be reduced as a result of allocating all of the Fund’s expenses over a smaller capital base. As a result, the Fund may be unable to achieve its investment objective and an investor could lose some or all of the value of his or her investment in the Shares. The Distributor is an affiliate of the Fund and the Advisor. As a result, the Distributor’s due diligence review and investigation of the Fund and this prospectus cannot be considered to be an independent review.

Municipal Securities Market Risk. Economic exposure to the municipal securities market involves certain risks. The municipal market is one in which dealer firms make markets in bonds on a principal basis using their proprietary capital. Most municipal securities will not be registered with the SEC or any state securities commission and will not be listed on any national securities exchange. The amount of public information available about the municipal securities to which the Fund is economically exposed is generally less than that for corporate equities or bonds, and the investment performance of the Fund may therefore be more dependent on the analytical abilities of the Advisor than would be a fund investing solely in stocks or taxable bonds. The secondary market for municipal securities, particularly the below investment grade securities to which the Fund may be economically exposed, also tends to be less well-developed or liquid than many other securities markets, which may adversely affect the Fund’s ability to sell such securities at attractive prices or at prices approximating those at which the Fund currently values them.

In addition, many state and municipal governments that issue securities are under significant economic and financial stress and may not be able to satisfy their obligations. This stress may be significantly exacerbated by the coronavirus pandemic. The ability of municipal issuers to make timely payments of interest and principal may be diminished during general economic downturns and as governmental cost burdens are reallocated among federal, state and local governments. The taxing power of any governmental entity may be limited by provisions of state constitutions or laws and an entity’s credit will depend on many factors, including the entity’s tax base, the extent to which the entity relies on federal or state aid, and other factors which are beyond the entity’s control. In addition, laws enacted in the future by Congress or state legislatures or referenda could extend the time for payment of principal and/or interest, or impose other constraints on enforcement of such obligations or on the ability of municipalities to levy taxes. Issuers of municipal securities might seek protection under the bankruptcy laws. In the event of bankruptcy of such an issuer, holders of municipal securities could experience delays in collecting principal and interest and such holders may not, in all circumstances, be able to collect all principal and interest to which they are entitled. To enforce its rights in the event of a default in the payment of interest or repayment of principal, or both, the Fund may take possession of and manage the assets securing the issuer’s obligations on such securities, which may increase the Fund’s operating expenses. Any income derived from the Fund’s ownership or operation of such assets may not be tax exempt or may fail to generate qualifying income for purposes of the income tests applicable to regulated investment companies (“RICs”) under the Internal Revenue Code of 1986 (the “Code”).

Risk Factors and Special Considerations Relating to Municipal Securities. The risks and special considerations involved in investment in municipal securities vary with the types of instruments being acquired. Certain instruments in which the Fund may invest may be characterized as derivative instruments. See “The Fund’s Investments—Description of Municipal Securities” and “The Fund’s Investments—Strategic Transactions—Financial Futures Transactions and Options.”

The value of municipal securities generally may be affected by uncertainties in the municipal markets as a result of legislation or litigation, including legislation or litigation that changes the taxation of municipal securities or the rights of municipal security holders in the event of a bankruptcy. Municipal bankruptcies are rare, and certain provisions of the U.S. Bankruptcy Code governing such bankruptcies are unclear. Further, the application of state law to municipal security issuers could produce varying results among the states or among municipal security issuers within a state. These uncertainties could have a significant impact on the prices of the municipal securities in which the Fund invests.

Tax Exempt Status Risk. In making investments, the Fund and the Advisor will rely on the opinion of issuers’ bond counsel and, in the case of derivative securities, sponsors’ counsel, on the tax exempt status of interest on municipal obligations and payments under tax‑exempt derivative securities. Neither the Fund nor the Advisor will independently review the bases for those tax opinions. If any of those tax opinions are ultimately determined to be incorrect or if events occur after the security is acquired that impact the security’s tax exempt status, the Fund and its shareholders could be subject to substantial tax liabilities. An assertion by the Internal Revenue Service (the “IRS”) that a portfolio security is not exempt from U.S. federal income tax (contrary to indications from the issuer) could affect the Fund’s and its shareholders’ income tax liability for the current or past years and could create liability for information reporting penalties. In addition, an IRS assertion of taxability may cause the Fund to be ineligible to pay exempt-interest dividends or may impair the liquidity and the fair market value of the securities. See “Tax Matters.”

Taxability Risk. The Fund intends to minimize the payment of taxable income to shareholders by investing in tax exempt or municipal securities in reliance at the time of purchase on an opinion of bond counsel to the issuer that the interest paid on those securities will be excludable from gross income for U.S. federal income tax purposes. Such securities, however, may be determined to pay, or have paid, taxable income subsequent to the Fund’s acquisition of the securities. In that event, the treatment of dividends previously paid or to be paid by the Fund as “exempt interest dividends” could be adversely affected, subjecting the Fund’s shareholders to increased

U.S. federal income tax liabilities. Alternatively, the Fund might enter into an agreement with the IRS to pay an agreed upon amount in lieu of the IRS adjusting individual shareholders’ income tax liabilities. If the Fund agrees to enter into such an agreement, the Fund’s yield could be adversely affected. Further, shareholders at the time the Fund enters into such an agreement that were not shareholders when the dividends in question were paid would bear some cost for a benefit they did not receive. Federal tax legislation may limit the types and volume of bonds the interest on which qualifies for a federal income tax exemption. As a result, current legislation and legislation that may be enacted in the future may affect the availability of municipal securities for investment by the Fund. In addition, future laws, regulations, rulings or court decisions may cause interest on municipal securities to be subject, directly or indirectly, to U.S. federal income taxation or interest on state municipal securities to be subject to state or local income taxation, or the value of state municipal securities to be subject to state or local intangible personal property tax, or may otherwise prevent the Fund from realizing the full current benefit of the tax exempt status of such securities. Any such change could also affect the market price of such securities, and thus the value of an investment in the Fund.

Alternative Minimum Tax and Capital Gain Tax Risk. The Fund expects that a portion of the interest or income it produces will be includable in alternative minimum taxable income. There is no limit on the portion of the Fund’s assets that may be invested in municipal securities the income from which would be subject to the alternative minimum tax. Exempt interest dividends also are likely to be subject to state and local income taxes. Distributions of any capital gain or other taxable income will be taxable to shareholders. The Shares may not be a suitable investment for investors who are subject to the federal alternative minimum tax or who would become subject to such tax by purchasing common shares. The suitability of an investment in common shares will depend upon a comparison of the after tax yield likely to be provided from the Fund with that from comparable tax exempt investments not subject to the alternative minimum tax, and from comparable fully taxable investments, in light of each such investor’s tax position.

Fixed-Income Securities Risks. Fixed-income securities in which the Fund may invest are generally subject to the following risks:

To the extent the Fund invests in debt securities that may be prepaid at the option of the obligor, the sensitivity of such securities to changes in interest rates may increase (to the detriment of the Fund) when interest rates rise. Moreover, because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the NAV of the Fund to the extent that it invests in floating rate debt securities. These basic principles of bond prices also apply to U.S. Government securities. A security backed by the “full faith and credit” of the U.S. Government is guaranteed only as to its stated interest rate and face value at maturity, not its current market price. Just like other fixed-income securities, government-guaranteed securities will fluctuate in value when interest rates change.

The Fund’s use of leverage will tend to increase the Fund’s interest rate risk. The Fund may utilize certain strategies, including taking positions in futures or interest rate swaps, for the purpose of reducing the interest rate sensitivity of fixed-income securities held by the Fund and decreasing the Fund’s exposure to interest rate risk. The Fund is not required to hedge its exposure to interest rate risk and may choose not to do so. In addition, there is no assurance that any attempts by the Fund to reduce interest rate risk will be successful or that any hedges that the Fund may establish will perfectly correlate with movements in interest rates.

Issuer Risk. The value of fixed-income securities may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage, reduced demand for the issuer’s goods and services, historical and prospective earnings of the issuer and the value of the assets of the issuer.

Credit Risk. Credit risk is the risk that one or more fixed-income securities in the Fund’s portfolio will decline in price or fail to make timely payments of interest or principal when due, or otherwise honor their obligations, because the issuer of the security experiences a decline in its financial status. Credit risk is increased when a portfolio security is downgraded or the perceived creditworthiness of the issuer deteriorates. To the extent the Fund invests in below investment grade securities, it will be exposed to a greater amount of credit risk than a

fund that only invests in investment grade securities. See “Risks—Below Investment Grade Securities Risk.” In addition, to the extent the Fund uses credit derivatives, such use will expose it to additional risk in the event that the bonds underlying the derivatives default. The degree of credit risk depends on the issuer’s financial condition and on the terms of the securities.

Prepayment Risk. During periods of declining interest rates, borrowers may exercise their option to prepay principal earlier than scheduled. For fixed rate securities, such payments often occur during periods of declining interest rates, forcing the Fund to reinvest in lower yielding securities, resulting in a possible decline in the Fund’s income and distributions to shareholders. This is known as prepayment or “call” risk. Below investment grade securities frequently have call features that allow the issuer to redeem the security at dates prior to its stated maturity at a specified price (typically greater than par) only if certain prescribed conditions are met (i.e., “call protection”). For premium bonds (bonds acquired at prices that exceed their par or principal value) purchased by the Fund, prepayment risk may be increased.

Reinvestment Risk. Reinvestment risk is the risk that income from the Fund’s portfolio will decline if the Fund invests the proceeds from matured, traded or called fixed-income securities at market interest rates that are below the Fund portfolio’s current earnings rate.

Duration and Maturity Risk. The Fund has no set policy regarding portfolio maturity or duration of the fixed-income securities it may hold. The Advisor may seek to adjust the portfolio’s duration or maturity based on its assessment of current and projected market conditions and all other factors that the Advisor deems relevant. Any decisions as to the targeted duration or maturity of any particular category of investments or of the Fund’s portfolio generally will be made based on all pertinent market factors at any given time. The Fund may incur costs in seeking to adjust the portfolio’s average duration or maturity. There can be no assurance that the Advisor’s assessment of current and projected market conditions will be correct or that any strategy to adjust the portfolio’s duration or maturity will be successful at any given time. In general, the longer the duration of any fixed-income securities in the Fund’s portfolio, the more exposure the Fund will have to the interest rate risks described above. See “Risks—Fixed-Income Securities Risks—Duration and Maturity Risk.”

Spread Risk. Credit spread refers to the difference in interest rates between higher quality and lower quality debt securities, with credit spreads tending to be wider for lower quality securities. Wider credit spreads and decreasing market values typically represent a deterioration of a debt security’s credit soundness and a perceived greater likelihood of risk or default by the issuer. In addition, credit

spreads in general, or for a particular quality of securities, may widen due to the anticipation of deteriorating economic conditions, with widening tending to be greater for lower grade securities. A widening of spread for a security generally will result in a reduction in the market value of the security.

Below Investment Grade Securities Risk. The Fund will invest without limit in Municipal Bonds that are rated, at the time of investment, below investment grade quality (rated Ba/BB or below, or judged to be of comparable quality by the Advisor), which are commonly referred to as “high yield” or “junk” bonds and are regarded as predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal when due. The value of high yield, lower quality bonds is affected by the creditworthiness of the issuers of the securities and by general economic and specific industry conditions. Issuers of high yield bonds are not perceived to be as strong financially as those with higher credit ratings. These issuers are more vulnerable to financial setbacks and recession than more creditworthy issuers, which may impair their ability to make interest and principal payments. Lower grade securities may be particularly susceptible to economic downturns. It is likely that an economic recession could severely disrupt the market for such securities and may have an adverse impact on the value of such securities. In addition, it is likely that any such economic downturn could adversely affect the ability of the issuers of such securities to repay principal and pay interest thereon and increase the incidence of default for such securities.

The secondary market for lower grade securities may be less liquid than that for higher rated securities. Adverse conditions could make it difficult at times for the Fund to sell certain securities or could result in lower prices than those used in calculating the Fund’s NAV. Because of the substantial risks associated with investments in lower grade securities, you could lose money on your investment in Shares of the Fund, both in the short-term and the long-term. To the extent that the Fund invests in lower grade securities that have not been rated by a rating agency, the Fund’s ability to achieve its investment objective will be more dependent on the Advisor’s credit analysis than would be the case when the Fund invests in rated securities. See “Risks—Below Investment Grade Securities Risk.”

Distressed and Defaulted Securities Risk. Investments in the securities of financially distressed issuers are speculative and involve substantial risks. These securities may present a substantial risk of default or may be in default at the time of investment. The Fund may incur additional expenses to the extent it is required to seek recovery upon a default in the payment of principal or interest on its portfolio holdings. In any reorganization or liquidation proceeding relating to a portfolio company, the Fund may lose its entire investment or may be required to accept cash or securities with a value less than its original

investment. Among the risks inherent in investments in a troubled entity is that it frequently may be difficult to obtain information as to the true financial condition of such issuer. The Advisor’s judgment about the credit quality of the issuer and the relative value and liquidity of its securities may prove to be wrong. Distressed securities and any securities received in an exchange for such securities may be subject to restrictions on resale.

Unrated Securities Risk. Because the Fund may purchase securities that are not rated by any rating organization, the Advisor may, after assessing their credit quality, internally assign ratings to certain of those securities in categories similar to those of rating organizations. Some unrated securities may not have an active trading market or may be difficult to value, which means the Fund might have difficulty selling them promptly at an acceptable price. To the extent that the Fund invests in unrated securities, the Fund’s ability to achieve its investment objective will be more dependent on the Advisor’s credit analysis than would be the case when the Fund invests in rated securities.

Leverage Risk. The use of leverage creates an opportunity for increased common share net investment income distributions, but also creates risks for the holders of Shares.

There can be no assurance that the Fund’s intended leveraging strategy will be successful. Leverage involves risks and special considerations for holders of Shares, including:

the likelihood of greater volatility of NAV and distribution rate of the Shares than a comparable portfolio without leverage;

the risk that fluctuations in interest rates or dividend rates on any leverage that the Fund must pay will reduce the return to the holders of Shares;

the effect of leverage in a declining market, which is likely to cause a greater decline in the NAV of the Shares than if the Fund were not leveraged; and

leverage may increase operating costs, which may reduce total return.

Any decline in the NAV of the Fund’s investments will be borne entirely by the holders of Shares. Therefore, if the market value of the Fund’s portfolio declines, leverage will result in a greater decrease in NAV to the holders of Shares than if the Fund were not leveraged. While the Fund may from time to time consider reducing leverage in response to actual or anticipated changes in interest rates in an effort to mitigate the increased volatility of current income and NAV associated with leverage, there can be no assurances that the Fund

will actually reduce leverage in the future or that any reduction, if undertaken, will benefit the holders of Shares. Changes in the future direction of interest rates are very difficult to predict accurately. If the Fund were to reduce leverage based on a prediction about future changes to interest rates, and that prediction turned out to be incorrect, the reduction in leverage would likely operate to reduce the income and/or total returns to holders of Shares relative to the circumstance where the Fund had not reduced leverage. The Fund may decide that this risk outweighs the likelihood of achieving the desired reduction to volatility in income and share price if the prediction were to prove to be correct and therefore determine not to reduce leverage as described above.

The Fund currently utilizes leverage through the use of Preferred Shares and investments in TOB Residuals (see “Risks—Tender Option Bond Risk”).

The Fund may utilize leverage through investment in derivatives. See “Risks—Strategic Transactions and Derivatives Risk.” Under Rule 18f‑4 under the Investment Company Act, among other things, the Fund must either use derivatives in a limited manner or comply with an outer limit on fund leverage risk based on value‑at‑risk. The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet the applicable requirements of the Investment Company Act and the rules thereunder.

Certain types of leverage used by the Fund may result in the Fund being subject to covenants relating to asset coverage and portfolio composition requirements. The Fund may be subject to certain restrictions on investments imposed by guidelines of one or more rating agencies, which may issue ratings for the short-term debt securities or preferred shares issued by the Fund. These guidelines may impose asset coverage or portfolio composition requirements that are more stringent than those imposed by the Investment Company Act. The Advisor does not believe that these covenants or guidelines will impede it from managing the Fund’s portfolio in accordance with the Fund’s investment objective and policies.

In addition to the foregoing, the use of leverage treated as indebtedness of the Fund for U.S. federal income tax purposes may reduce the amount of Fund dividends that are otherwise eligible for the dividends received deduction in the hands of corporate shareholders.

Tender Option Bond Risk. The Fund may leverage its assets through the use of TOB Residuals, which are derivative interests in municipal bonds. The TOB Residuals in which the Fund may invest pay interest or income that, in the opinion of counsel to the issuer of such TOB Residuals, is exempt from regular U.S. federal income tax. No independent investigation will be made to confirm the tax exempt

status of the interest or income paid by TOB Residuals held by the Fund. There is no assurance that the Fund’s strategy of using TOB Residuals to leverage its assets will be successful.

TOB Residuals represent beneficial interests in a special purpose trust formed for the purpose of holding municipal bonds contributed by one or more funds (a “TOB Trust”). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests (“TOB Floaters”), which are sold to third party investors, and TOB Residuals, which are generally issued to the fund(s) that transferred municipal bonds to the TOB Trust. TOB Floaters may have first priority on the cash flow from the municipal bonds held by the TOB Trust and are enhanced with a liquidity support arrangement provided by a third party bank or other financial institution (the “TOBs Liquidity Provider”) which allows holders to tender their position at par (plus accrued interest). The Fund, as a holder of TOB Residuals, is paid the residual cash flow from the TOB Trust after payment of TOB Trust expenses and interest on the TOB Floaters. As result, distributions on TOB Residuals will bear an inverse relationship to short-term municipal bond interest rates. Distributions on the TOB Residuals paid to the Fund will be reduced or, in the extreme, eliminated as short-term municipal interest rates rise and will increase when short-term municipal interest rates fall. The amount of such reduction or increase is a function, in part, of the amount of TOB Floaters sold by the TOB Trust relative to the amount of the TOB Residuals that it sells. The greater the amount of TOB Floaters sold relative to the TOB Residuals, the more volatile the distributions on the TOB Residuals will be. Short-term interest rates have been at historic lows in recent years, but have begun to increase and are generally expected to continue to do so in the current market environment.

The municipal bonds transferred to a TOB Trust typically are high grade municipal bonds. In certain cases, when municipal bonds transferred are lower grade municipal bonds, the TOB Trust transaction includes a credit enhancement feature that provides for the timely payment of principal and interest on the bonds to the TOB Trust by a credit enhancement provider. The TOB Trust would be responsible for the payment of the credit enhancement fee and the Fund, as a TOB Residual holder, would be responsible for reimbursement of any payments of principal and interest made by the credit enhancement provider.

Any leverage achieved through the Fund’s investment in TOB Residuals will increase the possibility that common share long-term returns will be diminished if the cost of the TOB Floaters issued by a TOB Trust exceeds the return on the securities in the TOB Trust. If the income and gains earned on municipal securities owned by a TOB Trust that issues TOB Residuals to the Fund are greater than the payments due on the TOB Floaters issued by the TOB Trust, the Fund’s returns will be greater than if it had not invested in the TOB Residuals.

Although the Fund generally would unwind a TOB transaction rather than try to sell a TOB Residual, if it did try to sell a TOB Residual, its ability to do so would depend on the liquidity of the TOB Residual.

TOB Residuals have varying degrees of liquidity based, among other things, upon the liquidity of the underlying securities deposited in the TOB Trust. The market price of TOB Residuals is more volatile than the underlying municipal bonds due to leverage.

The leverage attributable to the Fund’s use of TOB Residuals may be “called away” on relatively short notice and therefore may be less permanent than more traditional forms of leverage. The TOB Trust may be collapsed without the consent of the Fund upon the occurrence of termination events, as defined in the TOB Trust agreements, including if TOB Floaters that are tendered to the TOBs Liquidity Provider cannot be remarketed. Attempts to remarket tendered securities often failed during volatile market conditions in the past. Upon the occurrence of a termination event, a TOB Trust would be liquidated with the proceeds applied first to any accrued fees owed to the trustee of the TOB Trust, the remarketing agent of the TOB Floaters and the TOBs Liquidity Provider. Upon certain termination events, the holders of the TOB Floaters would be paid before the TOB Residual holders (i.e., the Fund) whereas in other termination events, the TOB Floater and TOB Residual holders would be paid pro rata. If the proceeds upon liquidation of a TOB Trust, net of payment of fees, are less than the aggregate amount the TOB Residual and TOB Floater holders invested in the TOB Trust, the Fund as a TOB Residual holder will realize a loss on its investment, particularly if the TOB Floater holders are paid before the TOB Residual holders. The risk of such a loss may be greater during volatile market conditions when it may be difficult to sell the bonds held by a TOB Trust.

The Fund may invest in a TOB Trust on either a non‑recourse or recourse basis. If the Fund invests in a TOB Trust on a recourse basis, it will typically enter into a reimbursement agreement with the TOBs Liquidity Provider pursuant to which the Fund is required to reimburse the TOBs Liquidity Provider the balance, if any, of the amount owed under the liquidity facility over the liquidation proceeds (the “Liquidation Shortfall”). As a result, if the Fund invests in a recourse TOB Trust, the Fund will bear the risk of loss with respect to any Liquidation Shortfall.

The Fund structures and “sponsors” the TOB Trusts in which it holds TOB Residuals and has certain duties and responsibilities, which may give rise to certain additional risks including, but not limited to, compliance, securities law and operational risks.

TOB Trusts constitute an important component of the municipal bond market. Any modifications or changes to the rules governing TOB Trusts may adversely impact the municipal market and the Fund, including through reduced demand for and liquidity of municipal bonds and increased financing costs for municipal issuers. The ultimate impact of any potential modifications on the TOB market and the overall municipal market is not yet certain.

Insurance Risk. The Fund may purchase municipal securities that are secured by insurance or may purchase insurance for municipal securities it owns. Insurance guarantees that interest payments on a municipal security will be made on time and that the principal will be repaid when the security matures. Insurance is expected to protect the Fund against losses caused by a municipal security issuer’s failure to make interest and principal payments. However, insurance does not protect the Fund or its shareholders against losses caused by declines in a municipal security’s value. Also, the Fund cannot be certain that any insurance company will make the payments it guarantees. While an insured municipal security will typically be deemed to have the rating of its insurer, if the insurer of a municipal security suffers a downgrade in its credit rating or the market discounts the value of the insurance provided by the insurer, the rating of the underlying municipal security will be more relevant and the value of the municipal security would more closely, if not entirely, reflect such rating. The Fund may lose money on its investment if the insurance company does not make payments it guarantees. If a municipal security’s insurer fails to fulfill its obligations or loses its credit rating, the value of the security could drop.

Yield and Ratings Risk. The yields on debt obligations are dependent on a variety of factors, including general market conditions, conditions in the particular market for the obligation, the financial condition of the issuer, the size of the offering, the maturity of the obligation and the ratings of the issue. The ratings of Moody’s, S&P and Fitch, which are described in “Appendix A—Description of Bond Ratings” to the SAI, represent their respective opinions as to the quality of the obligations they undertake to rate. Ratings, however, are general and are not absolute standards of quality. Consequently, obligations with the same rating, maturity and interest rate may have different market prices. Subsequent to its purchase by the Fund, a rated security may cease to be rated. The Advisor will consider such an event in determining whether the Fund should continue to hold the security.

Zero-Coupon Securities Risk. Zero-coupon securities are securities that are sold at a discount to par value and do not pay interest during the life of the security. The discount approximates the total amount of interest the security will accrue and compound over the period until maturity at a rate of interest reflecting the market rate of the security

at the time of issuance. Upon maturity, the holder of a zero coupon security is entitled to receive the par value of the security.

The Fund accrues income with respect to these securities for U.S. federal income tax and accounting purposes prior to the receipt of cash payments. Zero-coupon securities may be subject to greater fluctuation in value and less liquidity in the event of adverse market conditions than comparably rated securities that pay cash interest at regular intervals.

Further, to maintain its qualification for pass-through treatment under the federal tax laws, the Fund is required to distribute income to its shareholders and, consequently, may have to dispose of other, more liquid portfolio securities under disadvantageous circumstances or may have to leverage itself by borrowing in order to generate the cash to satisfy these distributions. The required distributions may result in an increase in the Fund’s exposure to zero coupon securities.

In addition to the above-described risks, there are certain other risks related to investing in zero coupon securities. During a period of severe market conditions, the market for such securities may become even less liquid. In addition, as these securities do not pay cash interest, the Fund’s investment exposure to these securities and their risks, including credit risk, will increase during the time these securities are held in the Fund’s portfolio.

Variable Rate Demand Obligations Risk. VRDOs are floating rate securities that combine an interest in a long-term municipal bond with a right to demand payment before maturity from a bank or other financial institution. If the bank or financial institution is unable to pay, the Fund may lose money.

Indexed and Inverse Securities Risk. Indexed and inverse securities provide a potential return based on a particular index of value or interest rates. The Fund’s return on these securities will be subject to risk with respect to the value of the particular index. These securities are subject to leverage risk and correlation risk. Certain indexed and inverse securities have greater sensitivity to changes in interest rates or index levels than other securities, and the Fund’s investment in such instruments may decline significantly in value if interest rates or index levels move in a way Fund management does not anticipate.

When-Issued, Forward Commitment and Delayed Delivery Transactions Risk. The Fund may purchase securities on a when-issued basis (including on a forward commitment or “TBA” (to be announced) basis) and may purchase or sell securities for delayed delivery. When-issued and delayed delivery transactions occur when securities are purchased or sold by the Fund with payment and delivery taking place in the future to secure an advantageous yield or price. Securities purchased on a when-issued or delayed delivery

basis may expose the Fund to counterparty risk of default as well as the risk that securities may experience fluctuations in value prior to their actual delivery. The Fund will not accrue income with respect to a when-issued or delayed delivery security prior to its stated delivery date. Purchasing securities on a when-issued or delayed delivery basis can involve the additional risk that the price or yield available in the market when the delivery takes place may not be as favorable as that obtained in the transaction itself.

Repurchase Agreements Risk. Subject to its investment objective and policies, the Fund may enter into repurchase agreements. Repurchase agreements typically involve the acquisition by the Fund of fixed-income securities from a selling financial institution such as a bank, savings and loan association or broker-dealer. The agreement provides that the Fund will sell the securities back to the institution at a fixed time in the future. The Fund does not bear the risk of a decline in the value of the underlying security unless the seller defaults under its repurchase obligation. In the event of the bankruptcy or other default of a seller of a repurchase agreement, the Fund could experience both delays in liquidating the underlying securities and losses, including possible decline in the value of the underlying security during the period in which the Fund seeks to enforce its rights thereto; possible lack of access to income on the underlying security during this period; and expenses of enforcing its rights. While repurchase agreements involve certain risks not associated with direct investments in fixed-income securities, the Fund follows procedures approved by the Board that are designed to minimize such risks. In addition, the value of the collateral underlying the repurchase agreement will be at least equal to the repurchase price, including any accrued interest earned on the repurchase agreement. In the event of a default or bankruptcy by a selling financial institution, the Fund generally will seek to liquidate such collateral. However, the exercise of the Fund’s right to liquidate such collateral could involve certain costs or delays and, to the extent that proceeds from any sale upon a default of the obligation to repurchase were less than the repurchase price, the Fund could suffer a loss.

Securities Lending Risk. The Fund may lend securities to financial institutions. Securities lending involves exposure to certain risks, including operational risk (i.e., the risk of losses resulting from problems in the settlement and accounting process), “gap” risk (i.e., the risk of a mismatch between the return on cash collateral reinvestments and the fees the Fund has agreed to pay a borrower), foreign exchange risk (i.e., the risk of a shortfall at default when a cash collateral investment is denominated in a currency other than the currency of the assets being loaned due to movements in foreign exchange rates), and credit, legal, counterparty and market risks. If a securities lending counterparty were to default, the Fund would be subject to the risk of a possible delay in receiving collateral or in recovering the loaned securities, or to a possible loss of rights in the

collateral. In the event a borrower does not return the Fund’s securities as agreed, the Fund may experience losses if the proceeds received from liquidating the collateral do not at least equal the value of the loaned security at the time the collateral is liquidated, plus the transaction costs incurred in purchasing replacement securities. This event could trigger adverse tax consequences for the Fund. The Fund could lose money if its short-term investment of the collateral declines in value over the period of the loan. Substitute payments for dividends received by the Fund for securities loaned out by the Fund will generally not be considered qualified dividend income. The securities lending agent will take the tax effects on shareholders of this difference into account in connection with the Fund’s securities lending program. Substitute payments received on tax exempt securities loaned out will generally not be tax exempt income.

Restricted and Illiquid Investments Risk. The Fund may invest in illiquid or less liquid investments or investments in which no secondary market is readily available or which are otherwise illiquid, including private placement securities. The Fund may not be able to readily dispose of such investments at prices that approximate those at which the Fund could sell such investments if they were more widely-traded and, as a result of such illiquidity, the Fund may have to sell other investments or engage in borrowing transactions if necessary to raise cash to meet its obligations. Limited liquidity can also affect the market price of investments, thereby adversely affecting the Fund’s NAV and ability to make dividend distributions. The financial markets have in recent years experienced periods of extreme secondary market supply and demand imbalance, resulting in a loss of liquidity during which market prices were suddenly and substantially below traditional measures of intrinsic value. During such periods, some investments could be sold only at arbitrary prices and with substantial losses. Periods of such market dislocation may occur again at any time.

Restricted securities are securities that may not be sold to the public without an effective registration statement under the Securities Act of 1933, as amended (the “Securities Act”), or that may be sold only in a privately negotiated transaction or pursuant to an exemption from registration. For example, Rule 144A under the Securities Act provides an exemption from the registration requirements of the Securities Act for the resale of certain restricted securities to qualified institutional buyers, such as the Fund. However, an insufficient number of qualified institutional buyers interested in purchasing the Rule 144A-eligible securities that the Fund holds could affect adversely the marketability of certain Rule 144A securities, and the Fund might be unable to dispose of such securities promptly or at reasonable prices. When registration is required to sell a security, the Fund may be obligated to pay all or part of the registration expenses and considerable time may pass before the Fund is permitted to sell a security under an effective registration statement. If adverse market

conditions develop during this period, the Fund might obtain a less favorable price than the price that prevailed when the Fund decided to sell. The Fund may be unable to sell restricted and other illiquid investments at opportune times or prices.

Investment Companies and ETFs Risk. Subject to the limitations set forth in the Investment Company Act and the rules thereunder, the Fund may acquire shares in other investment companies and in exchange-traded funds (“ETFs”), some of which may be affiliated investment companies. These investment companies and ETFs will generally have investment exposure to the commodities markets which may subject them to greater volatility than investments in traditional securities. The market value of the shares of other investment companies and ETFs may differ from their NAV. As an investor in investment companies and ETFs, the Fund would bear its ratable share of that entity’s expenses (to the extent not offset by BlackRock through waivers), including its investment advisory and administration fees, while continuing to pay its own advisory and administration fees and other expenses. As a result, shareholders will be absorbing duplicate levels of fees with respect to investments in other investment companies and ETFs (to the extent not offset by BlackRock through waivers).

The securities of other investment companies and ETFs, in which the Fund may invest may be leveraged. As a result, the Fund may be indirectly exposed to leverage through an investment in such securities. An investment in securities of other investment companies and ETFs, that use leverage may expose the Fund to higher volatility in the market value of such securities and the possibility that the Fund’s long-term returns on such securities (and, indirectly, the long-term returns of shares of the Fund) will be diminished. As with other investments, investments in other investment companies, including ETFs, are subject to market and selection risk. To the extent the Fund is held by an affiliated fund, the ability of the Fund itself to hold other investment companies may be limited.

Strategic Transactions and Derivatives Risk. The Fund may engage in various Strategic Transactions for duration management and other investment and risk management purposes, including to attempt to protect against possible changes in the market value of the Fund’s portfolio resulting from trends in the securities markets and changes in interest rates or to protect the Fund’s unrealized gains in the value of its portfolio securities, to facilitate the sale of portfolio securities for investment purposes or to establish a position in the securities markets as a temporary substitute for purchasing particular securities or to enhance income or gain. Derivatives are financial contracts or instruments whose value depends on, or is derived from, the value of an underlying asset, reference rate or index (or relationship between two indices). The Fund also may use derivatives to add leverage to the portfolio and/or to hedge against increases in the Fund’s costs

associated with any leverage strategy that it may employ. The use of Strategic Transactions to enhance current income may be speculative.

Strategic Transactions involve risks. The risks associated with Strategic Transactions include (i) the imperfect correlation between the value of such instruments and the underlying assets, (ii) the possible default of the counterparty to the transaction, (iii) illiquidity of the derivative instruments, and (iv) high volatility losses caused by unanticipated market movements, which are potentially unlimited. Although both OTC and exchange-traded derivatives markets may experience a lack of liquidity, OTC non‑standardized derivative transactions are generally less liquid than exchange-traded instruments. The illiquidity of the derivatives markets may be due to various factors, including congestion, disorderly markets, limitations on deliverable supplies, the participation of speculators, government regulation and intervention, and technical and operational or system failures. In addition, daily limits on price fluctuations and speculative position limits on exchanges on which the Fund may conduct its transactions in derivative instruments may prevent prompt liquidation of positions, subjecting the Fund to the potential of greater losses. Furthermore, the Fund’s ability to successfully use Strategic Transactions depends on the Advisor’s ability to predict pertinent asset prices, interest rates, currency exchange rates and other economic factors, which cannot be assured.

The use of Strategic Transactions may result in losses greater than if they had not been used, may require the Fund to sell or purchase portfolio securities at inopportune times or for prices other than current market values, may limit the amount of appreciation the Fund can realize on an investment or may cause the Fund to hold a security that it might otherwise sell. Additionally, amounts paid by the Fund as premiums and cash or other assets held in margin accounts with respect to Strategic Transactions are not otherwise available to the Fund for investment purposes. Please see the Fund’s SAI for a more detailed description of Strategic Transactions and the various derivative instruments the Fund may use and the various risks associated with them.

Exchange-traded derivatives and OTC derivative transactions submitted for clearing through a central counterparty have become subject to minimum initial and variation margin requirements set by the relevant clearinghouse, as well as possible margin requirements mandated by the SEC or the Commodity Futures Trading Commission (“CFTC”). The CFTC and federal banking regulators also have imposed margin requirements on non‑cleared OTC derivatives, and the SEC’s non cleared margin requirements for security-based swaps became effective on November 1, 2021. Applicable margin requirements may increase the overall costs for the Fund.

Many OTC derivatives are valued on the basis of dealers’ pricing of these instruments. However, the price at which dealers value a

particular derivative and the price that the same dealers would actually be willing to pay for such derivative should the Fund wish or be forced to sell such position may be materially different. Such differences can result in an overstatement of the Fund’s NAV and may materially adversely affect the Fund in situations in which the Fund is required to sell derivative instruments.

While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between the derivative and the underlying security, and there can be no assurance that the Fund’s hedging transactions will be effective.

Derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation is not yet known and may not be known for some time. New regulation may make derivatives more costly, may limit the availability of derivatives, or may otherwise adversely affect the value or performance of derivatives.

Future regulatory developments may impact the Fund’s ability to invest or remain invested in certain derivatives. Legislation or regulation may also change the way in which the Fund itself is regulated. The Advisor cannot predict the effects of any new governmental regulation that may be implemented on the ability of the Fund to use swaps or any other financial derivatives product, and there can be no assurance that any new governmental regulation will not adversely affect the Fund’s ability to achieve its investment objective.

Counterparty Risk. The Fund will be subject to credit risk with respect to the counterparties to the derivative contracts entered into by the Fund. Because derivative transactions in which the Fund may engage may involve instruments that are not traded on an exchange or cleared through a central counterparty but are instead traded between counterparties based on contractual relationships, the Fund is subject to the risk that a counterparty will not perform its obligations under the related contracts. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the Fund may experience significant delays in obtaining any recovery in bankruptcy or other reorganization proceedings. The Fund may obtain only a limited recovery, or may obtain no recovery, in such circumstances. Although the Fund intends to enter into transactions only with counterparties that the Advisor believes to be creditworthy, there can be no assurance that, as a result, a counterparty will not default and that the Fund will not sustain a loss on a transaction. In the event of the counterparty’s bankruptcy or insolvency, the Fund’s collateral may be subject to the conflicting claims of the counterparty’s creditors, and the Fund may be exposed to the risk of a court treating the Fund as a general unsecured creditor of the counterparty, rather than as the owner of the collateral.

The counterparty credit risk for cleared derivatives is generally lower than for uncleared OTC derivative transactions since a clearing organization is the counterparty to a cleared derivative contract and a clearing organization is generally considered to be of better credit quality than a counterparty to an uncleared OTC derivative transaction.

However, there can be no assurance that a clearing organization, or its members, will satisfy its obligations to the Fund, or that the Fund would be able to recover the full amount of assets deposited on its behalf with the clearing organization in the event of the default by the clearing organization or the Fund’s clearing broker. In addition, cleared derivative transactions benefit from daily marking to market and settlement, and segregation and minimum capital requirements applicable to intermediaries. Uncleared OTC derivative transactions generally may not benefit from such protections. This exposes the Fund to the risk that a counterparty will not settle a transaction in accordance with its terms and conditions because of a dispute over the terms of the contract (whether or not bona fide) or because of a credit or liquidity problem, thus causing the Fund to suffer a loss. Such “counterparty risk” is accentuated for contracts with longer maturities where events may intervene to prevent settlement, or where the Fund has concentrated its transactions with a single or small group of counterparties.

In addition, the Fund is subject to the risk that issuers of the instruments in which it invests and trades may default on their obligations under those instruments, and that certain events may occur that have an immediate and significant adverse effect on the value of those instruments. There can be no assurance that an issuer of an instrument in which the Fund invests will not default, or that an event that has an immediate and significant adverse effect on the value of an instrument will not occur, and that the Fund will not sustain a loss on a transaction as a result.

Swaps Risk. Swaps are a type of derivative. Swap agreements involve the risk of changes in market value of the swap position as well as the risk that the swap counterparty will default on its payment or other obligations to the Fund and the risk that the Fund will not be able to meet its obligations to pay the other party to the agreement. In order to seek to hedge the value of the Fund’s portfolio, to hedge against increases in the Fund’s cost associated with interest payments on any outstanding borrowings or to seek to increase the Fund’s return, the Fund may enter into swaps, including interest rate swap, total return swap (sometimes referred to as a “contract for difference”) and/or credit default swap transactions. In interest rate swap transactions, there is a risk that yields will move in the direction opposite of the direction anticipated by the Fund, which would cause the Fund to make payments to its counterparty in the transaction that could adversely affect Fund performance. In addition to the risks applicable

to swaps generally (including counterparty risk, high volatility, illiquidity risk and credit risk), credit default swap transactions involve special risks because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default or other credit event by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty).

The United States, the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (the “Dodd-Frank Act”), requires that certain derivatives with U.S. persons must be executed on a regulated market and a substantial portion of OTC derivatives must be submitted for clearing to regulated clearinghouses. As a result, swap transactions entered into by the Fund may become subject to various requirements applicable to swaps under the Dodd-Frank Act, including clearing, exchange-execution, reporting and recordkeeping requirements, which may make it more difficult and costly for the Fund to enter into swap transactions and may also render certain strategies in which the Fund might otherwise engage impossible or so costly that they will no longer be economical to implement. Furthermore, the number of counterparties that may be willing to enter into swap transactions with the Fund may also be limited if the swap transactions with the Fund are subject to the swap regulation under the Dodd-Frank Act.

Credit default and total return swap agreements may effectively add leverage to the Fund’s portfolio because, in addition to its Managed Assets, the Fund would be subject to investment exposure on the notional amount of the swap in excess of any premium and margin required to establish and maintain the position. Total return swap agreements are subject to market risk as well as the risk that a counterparty will default on its payment obligations to the Fund thereunder. The Fund is not required to enter into swap transactions for hedging purposes or to enhance income or gain and may choose not to do so. In addition, the swaps market is subject to a changing regulatory environment. It is possible that regulatory or other developments in the swaps market could adversely affect the Fund’s ability to successfully use swaps.

Economic Sector and Geographic Risk. The Fund may invest 25% or more of its Managed Assets in municipal securities of issuers in the same state (or U.S. Territory) or in the same economic sector. If the Fund does so, this may make it more susceptible to adverse economic, political or regulatory occurrences affecting a particular state or economic sector. As concentration increases, so does the potential for fluctuation in the net asset value of the Shares. See “Risks—Economic Sector and Geographic Risk.”

Risks Associated with Recent Market Events. Although interest rates were unusually low in recent years in the U.S. and abroad, in 2022,

the Federal Reserve and certain foreign central banks raised interest rates as part of their efforts to address rising inflation. The Federal Reserve and certain foreign central banks have started to lower interest rates, though economic or other factors, such as inflation, could stop such changes. It is difficult to accurately predict the pace at which interest rates might change, the timing, frequency or magnitude of any such changes in interest rates, or when such changes might stop or again reverse course. Additionally, various economic and political factors could cause the Federal Reserve or other foreign central banks to change their approach in the future and such actions may result in an economic slowdown both in the U.S. and abroad. Unexpected changes in interest rates could lead to significant market volatility or reduce liquidity in certain sectors of the market. Deteriorating economic fundamentals may, in turn, increase the risk of default or insolvency of particular issuers, negatively impact market value, cause credit spreads to widen, and reduce bank balance sheets. Any of these could cause an increase in market volatility, reduce liquidity across various markets or decrease confidence in the markets, which could negatively affect the value of debt instruments held by the Fund and result in a negative impact on the Fund’s performance.

Recent policy initiatives undertaken by the U.S. government have the potential to impact international relations, trade agreements and the overall regulatory environment in ways that could create uncertainty and instability in domestic and global markets, and could adversely affect the investment performance of the Fund. In particular, actions taken by the U.S. government in respect of international trade relations could lead to trade wars, increased costs for imported goods, disruptions in supply chains, reduced foreign investment, and instability in regions where the Fund invests. Political and diplomatic events within the United States, including a contentious domestic political environment, changes in political party control of one or more branches of the U.S. government, the U.S. government’s inability at times to agree on a long term budget and deficit reduction plan, the threat of a U.S. government shutdown, and disagreements over, or threats not to increase, the U.S. government’s borrowing limit (or “debt ceiling”), as well as political and diplomatic events abroad, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. A downgrade of the ratings of U.S. government debt obligations, or concerns about the U.S. government’s credit quality in general, could have a substantial negative effect on the U.S. and global economies. In recent years, some countries, including the United States, have adopted more protectionist trade policies. Slowing global economic growth, the rise in protectionist trade policies, inflationary pressures, changes to some major international trade agreements, risks associated with the trade agreements between countries and regions, including the U.S. and other foreign nations, political or economic dysfunction within some countries or regions,

including the U.S., and dramatic changes in commodity and currency prices could affect the economies of many nations in ways that cannot necessarily be foreseen at the present time.

Market Disruption and Geopolitical Risk. The occurrence of events similar to those in recent years, such as the aftermath of the war in Iraq, instability in Afghanistan, Pakistan, Egypt, Libya, Syria and the Middle East, international war or conflict (including the Israel-Hamas war), new and ongoing epidemics and pandemics of infectious diseases and other global health events, natural/environmental disasters, terrorist attacks in the United States and around the world, social and political discord, debt crises (such as the Greek crisis), sovereign debt downgrades, the Russian invasion of Ukraine, increasingly strained relations between the United States and a number of foreign countries, including historical adversaries, such as North Korea, Iran, China and Russia, and the international community generally, new and continued political unrest in various countries, such as Venezuela and Spain, the exit or potential exit of one or more countries from the EU or the EMU, and continued changes in the balance of political power among and within the branches of the U.S. government, among others, may result in market volatility, may have long term effects on the U.S. and worldwide financial markets, and may cause further economic uncertainties in the United States and worldwide.

Russia launched a large-scale invasion of Ukraine on February 24, 2022. The extent and duration of the military action, resulting sanctions and resulting future market disruptions, including declines in its stock markets and the value of the ruble against the U.S. dollar, in the region are impossible to predict, but could be significant. Any such disruptions caused by Russian military action or other actions (including cyberattacks and espionage) or resulting actual and threatened responses to such activity, including purchasing and financing restrictions, boycotts or changes in consumer or purchaser preferences, sanctions, tariffs or cyberattacks on the Russian government, Russian companies or Russian individuals, including politicians, could have a severe adverse effect on Russia and the European region, including significant negative impacts on the Russian economy, the European economy and the markets for certain securities and commodities, such as oil and natural gas, and may likely have collateral impacts on such sectors globally as well as other sectors. How long such military action and related events will last cannot be predicted.

Trade tensions between the United States and China have led to concerns about economic stability and could have an adverse impact on global economic conditions. The United States and China have each been implementing increased tariffs on imports from the other, and the United States has also adopted certain targeted measures such as export controls or sanctions implicating Chinese companies and

officials. While certain trade agreements have been agreed between the two countries, there remains much uncertainty as to whether the trade negotiations between the United States and China will be successful and how the trade war between the United States and China will progress. Uncertainty regarding the outcome of the trade tensions and the potential for a trade war could cause the U.S. dollar to decline against safe haven currencies, such as the Japanese yen and the Euro. Events such as these and their consequences are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future. If the trade war between the United States and China continues or escalates, or if additional tariffs or trade restrictions are implemented by the United States, China or other countries in connection with a global trade war, there could be material adverse effects on the global economy, and the Fund and its portfolio investments could be materially and adversely affected.

On January 31, 2020, the United Kingdom officially left the European Union (Brexit), subject to a transitional period that ended December 31, 2020. The United Kingdom and European Union have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the United Kingdom and the European Union in relation to matters not covered by the trade agreement, such as financial services. The Fund faces risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the United Kingdom and European Union is defined and the United Kingdom determines which European Union laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Fund has exposure and any other assets that the Fund invests in.

The occurrence of any of these above events could have a significant adverse impact on the value and risk profile of the Fund’s portfolio. The Fund does not know how long the securities markets may be affected by similar events and cannot predict the effects of similar events in the future on the U.S. economy and securities markets. There can be no assurance that similar events and other market disruptions will not have other material and adverse implications.

Cybersecurity incidents affecting particular companies or industries may adversely affect the economies of particular countries of the world in which the Fund invests.

Regulation and Government Intervention Risk. Federal, state, and other governments, their regulatory agencies or self-regulatory organizations may take actions that affect the regulation of the issuers in which the Fund invests in ways that are unforeseeable. Legislation or regulation may also change the way in which the Fund is regulated. Such legislation or regulation could limit or preclude the Fund’s ability to achieve its investment objective.

In light of popular, political and judicial focus on finance related consumer protection, financial institution practices are also subject to greater scrutiny and criticism generally. In the case of transactions between financial institutions and the general public, there may be a greater tendency toward strict interpretation of terms and legal rights in favor of the consuming public, particularly where there is a real or perceived disparity in risk allocation and/or where consumers are perceived as not having had an opportunity to exercise informed consent to the transaction. In the event of conflicting interests between retail investors holding common shares of a closed end investment company such as the Fund and a large financial institution, a court may similarly seek to strictly interpret terms and legal rights in favor of retail investors.

The Fund may be affected by governmental action in ways that are not foreseeable, and there is a possibility that such actions could have a significant adverse effect on the Fund and its ability to achieve its investment objective.

Legal, Tax and Regulatory Risks. Legal, tax and regulatory changes could occur that may have material adverse effects on the Fund.

To qualify for the favorable U.S. federal income tax treatment generally accorded to RICs, the Fund must, among other things, derive in each taxable year at least 90% of its gross income from certain prescribed sources and distribute for each taxable year at least 90% of its “investment company taxable income” (generally, ordinary income plus the excess, if any, of net short-term capital gain over net long-term capital loss). If for any taxable year the Fund does not qualify as a RIC, all of its taxable income for that year (including its net capital gain) would be subject to tax at regular corporate rates without any deduction for distributions to shareholders, and such distributions would be taxable as ordinary dividends to the extent of the Fund’s current and accumulated earnings and profits.

The rules dealing with U.S. federal income taxation are constantly under review by persons involved in the legislative process and by the IRS and the U.S. Treasury Department. Revisions in U.S. federal tax laws and interpretations of these laws could adversely affect the tax consequences of your investment.

Investment Dilution Risk. The Fund’s investors do not have preemptive rights to any Shares the Fund may issue in the future. After an investor purchases Shares, the Fund may sell additional Shares or other classes of Shares in the future or issue equity interests in private offerings. To the extent the Fund issues additional equity interests after an investor purchases its Shares, such investor’s percentage ownership interest in the Fund will be diluted.

Potential Conflicts of Interest of the Advisor and Others. The investment activities of the Advisor and its affiliates (including BlackRock, Inc. and its subsidiaries (collectively, the “Affiliates”)) and their respective directors, officers and employees and of in the management of, or their interest in, their own accounts and other accounts they manage, may present conflicts of interest that could disadvantage the Fund and its shareholders. BlackRock and its Affiliates provide investment management services to other funds and discretionary managed accounts that may follow investment programs similar to that of the Fund. Subject to the requirements of the Investment Company Act, BlackRock and its Affiliates intend to engage in such activities and may receive compensation from third parties for their services. None of BlackRock or its Affiliates are under any obligation to share any investment opportunity, idea or strategy with the Fund. As a result, BlackRock and its Affiliates may compete with the Fund for appropriate investment opportunities. The results of the Fund’s investment activities, therefore, may differ from those of an Affiliate or another account managed by an Affiliate and it is possible that the Fund could sustain losses during periods in which one or more Affiliates and other accounts achieve profits on their trading for proprietary or other accounts. BlackRock has adopted policies and procedures designed to address potential conflicts of interest. For additional information about potential conflicts of interest and the way in which BlackRock addresses such conflicts, please see “Conflicts of Interest” and “Management of the Fund—Portfolio Management—Potential Material Conflicts of Interest” in the SAI.

For a discussion of additional risks relating to investments in the Fund, including “Equity Securities Risk,” “Convertible Securities Risk,” “Short Sales Risk,” “Inflation Risk,” “Deflation Risk,” “Regulation as a ‘Commodity Pool’,” “Failures of Futures Commission Merchants and Clearing Organizations Risk,” “Reference Rate Replacement Risk,” “Market and Selection Risk,” “Defensive Investing Risk,” “Decision-Making Authority Risk,” “Management Risk,” “Valuation Risk,” “Reliance on the Advisor Risk,” “Reliance on Service Providers Risk,” “Information Technology Systems Risk,” “Operational Risk and Technology Risks,” “Misconduct of Employees and of Service Providers Risk,” “Operational Risk,” “Portfolio Turnover Risk,” and “Anti-Takeover Provisions Risk,” please see “Risks” beginning on page 72 of this prospectus.