Primary Offering Prospectus - Form 424B2

Table of Contents

BASE PROSPECTUS

$363,851,781.95

Common Shares

Preferred Shares

Rights to Purchase Common Shares

Nuveen Dynamic Municipal Opportunities Fund

The Offering. Nuveen Dynamic Municipal Opportunities Fund (the "Fund") is offering, on an immediate, continuous or delayed basis, in one or more offerings, with a maximum aggregate dollar offering price of up to $363,851,781.95, common shares ("Common Shares"), preferred shares ("Preferred Shares"), and/or subscription rights to purchase Common Shares ("Rights," and collectively with Common Shares and Preferred Shares, "Securities"), in any combination. The Fund may offer and sell such Securities directly to one or more purchasers, to or through underwriters, through dealers or agents that the Fund designates from time to time, or through a combination of these methods. The prospectus supplement relating to any offering of Securities will describe such offering, including, as applicable, the names of any underwriters, dealers or agents and information regarding any applicable purchase price, fee, commission or discount arrangements made with those underwriters, dealers or agents or the basis upon which such amount may be calculated. The prospectus supplement relating to any Rights offering will set forth the number of Common Shares issuable upon the exercise of each Right (or number of Rights) and the other terms of such Rights offering. For more information about the manners in which the Fund may offer Securities, see "Plan of Distribution."

The Fund. The Fund is a diversified, closed-end management investment company. The Fund's objective is to seek total return through income exempt from regular federal income taxes and capital appreciation. There can be no assurance that the Fund will achieve its investment objectives or that the Fund's investment strategies will be successful.

This Prospectus, together with any related prospectus supplement, sets forth concisely information about the Fund that a prospective investor should know before investing, and should be retained for future reference. Investing in Securities involves risks, including the risks associated with the Fund's use of leverage. You could lose some or all of your investment. You should consider carefully these risks together with all of the other information in this Prospectus and any related prospectus supplement before making a decision to purchase any of the Securities. See "Risk Factors" beginning on page 13.

Common Shares are listed on the New York Stock Exchange (the "NYSE"). The trading or "ticker" symbol of the Common Shares is "NDMO." The closing price of the Common Shares, as reported by the NYSE on August 15, 2024, was $10.88 per Common Share. The net asset value of the Common Shares at the close of business on that same date was $11.24 per Common Share. Preferred Shares and/or Rights issued by the Fund may also be listed on a securities exchange.

* * *

You should read this Prospectus, together with any related prospectus supplement, which contains important information about the Fund, before deciding whether to invest and retain it for future reference. A Statement of Additional Information, dated August 26, 2024 (the "SAI"), containing additional information about the Fund has been filed with the U.S. Securities and Exchange Commission (the "SEC") and is incorporated by reference in its entirety into this Prospectus. You may request a free copy of the SAI, the table of contents of which is on the last page of this Prospectus, annual and semi-annual reports to shareholders and other information about the Fund and make shareholder inquiries by calling (800) 257-8787, by writing to the Fund at 333 West Wacker Drive, Chicago, Illinois 60606 or from the Fund's website (http://www.nuveen.com). The information contained in, or that can be accessed through, the Fund's website is not part of this Prospectus, except to the extent specifically incorporated by reference herein. You also may obtain a copy of the SAI (and other information regarding the Fund) from the SEC's web site (http://www.sec.gov).

The date of this Prospectus is August 26, 2024.

The Securities do not represent a deposit or obligation of, and are not guaranteed or endorsed by, any bank or other insured depository institution, and are not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other governmental agency.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this Prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

Table of Contents

TABLE OF CONTENTS

You should rely only on the information contained or incorporated by reference into this Prospectus and any related prospectus supplement. The Fund has not authorized anyone to provide you with different information. The Fund is not making an offer of these securities in any state where the offer is not permitted. You should not assume that the information contained in this Prospectus and any related prospectus supplement is accurate as of any date other than the dates on their covers. The Fund will update this Prospectus to reflect any material changes to the disclosures herein.

Table of Contents

FORWARD-LOOKING STATEMENTS

Any projections, forecasts and estimates contained or incorporated by reference herein are forward looking statements and are based upon certain assumptions. Projections, forecasts and estimates are necessarily speculative in nature, and it can be expected that some or all of the assumptions underlying any projections, forecasts or estimates will not materialize or will vary significantly from actual results. Actual results may vary from any projections, forecasts and estimates and the variations may be material. Some important factors that could cause actual results to differ materially from those in any forward looking statements include changes in interest rates, market, financial or legal uncertainties, including changes in tax law, and the timing and frequency of defaults on underlying investments. Consequently, the inclusion of any projections, forecasts and estimates herein should not be regarded as a representation by the Fund or any of its affiliates or any other person or entity of the results that will actually be achieved by the Fund. Neither the Fund nor its affiliates has any obligation to update or otherwise revise any projections, forecasts and estimates including any revisions to reflect changes in economic conditions or other circumstances arising after the date hereof or to reflect the occurrence of unanticipated events, even if the underlying assumptions do not come to fruition. The Fund acknowledges that, notwithstanding the foregoing, the safe harbor for forward-looking statements under the Private Securities Litigation Reform Act of 1995 does not apply to investment companies such as the Fund.

Table of Contents

PROSPECTUS SUMMARY

This is only a summary. You should review the more detailed information contained elsewhere in this Prospectus and any related prospectus supplement and in the Statement of Additional Information (the "SAI").

Table of Contents

Table of Contents

Table of Contents

The Fund reserves the right to change its distribution policy and the basis for establishing the rate of its monthly distributions at any time and may do so without prior notice to Common Shareholders.

Table of Contents

See "Fund Tax Risk," as contained in the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Principal Risks of the Funds-Fund Level and Other Risks."

Table of Contents

SUMMARY OF FUND EXPENSES

Please refer to the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Updated Disclosures for Funds with an Effective Shelf Offering Registration Statement-Summary of Fund Expenses," which is incorporated by reference herein, for a discussion of fees and expenses of the Fund.

FINANCIAL HIGHLIGHTS

The Fund's financial highlights for the fiscal years ended October 31, 2023, October 31, 2022, October 31, 2021 and the fiscal period August 26, 2020 (commencement of operations) through October 31, 2020, are incorporated by reference from the Fund's Annual Reportfor the fiscal year ended October 31, 2023 (File No. 811-23489), as filed with the SEC on Form N-CSR on January 5, 2024. The financial highlights for each of these fiscal periods have been derived from financial statements audited by KPMG LLP, the Fund's independent registered public accounting firm, for the last four fiscal periods. KPMG LLP has not reviewed or examined any records, transactions or events after the date of such reports. The information with respect to the six months ended April 30, 2024 is unaudited and is included in the Fund's 2024 Semi-Annual Report which is incorporated herein by reference. A copy of the Fund's Annual Report and Semi-Annual Report may be obtained from www.sec.gov or by visiting www.nuveen.com.

TRADING AND NET ASSET VALUE INFORMATION

Please refer to the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Updated Disclosures for Funds with an Effective Shelf Offering Registration Statement-Trading and Net Asset Value Information," which is incorporated by reference herein, for a discussion of the following information for the periods indicated: (i) the high and low market prices for Common Shares reported as of the end of the day on the NYSE, (ii) the high and low net asset values of Common Shares, and (iii) the high and low of the premium/(discount) to net asset value (expressed as a percentage) of Common Shares.

The net asset value per Common Share, the market price, and percentage of premium/(discount) to net asset value per Common Share on August 15, 2024, $11.24, $10.88 and (3.20)%, respectively. As of July 31, 2024, the Fund had 59,562,212 Common Shares outstanding and net assets applicable to Common Shares of $668,085,662.

THE FUND

The Fund is a diversified, closed-end management investment company registered under the 1940 Act. The Fund was organized as a Massachusetts business trust on November 4, 2019, pursuant to the Declaration of Trust, which is governed by the laws of the Commonwealth of Massachusetts. The Fund's Common Shares are listed on the NYSE under the symbol "NDMO." Preferred Shares and/or Rights issued by the Fund may also be listed on a securities exchange.

The following provides information about the Fund's outstanding Common Shares and Preferred Shares as of July 31, 2024:

Table of Contents

USE OF PROCEEDS

Unless otherwise specified in a prospectus supplement, the net proceeds from any offering will be invested in accordance with the Fund's investment objective and policies as stated below. Pending investment, the timing of which may vary depending on the size of the investment but in no case is expected to exceed 30 days, it is anticipated that the proceeds will be invested in high-quality, short-term investments. See "Use of Leverage."

THE FUND'S INVESTMENTS

Investment Objective and Policies

Please refer to the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Investment Objective" and "-Investment Policies," as such investment objective and investment policies may be supplemented from time to time, which is incorporated by reference herein, for a discussion of the Fund's investment objective and policies.

Portfolio Composition and Other Information

Please refer to the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Investment Policies-Portfolio Contents," as such portfolio contents may be supplemented from time to time, which is incorporated by reference herein, for a discussion of the investments principally included in the Fund's portfolio. More detailed information about the Fund's portfolio investments are contained in the SAI under "The Fund's Investments."

Portfolio Turnover

The Fund may engage in portfolio trading when considered appropriate, but short-term trading will not be used as the primary means of achieving the Fund's investment objective. For the fiscal year ended October 31, 2023, the Fund's portfolio turnover rate was 79%. For the six months ended April 30, 2024, the Fund's portfolio turnover was 42% (unaudited). However, there are no limits on the Fund's rate of portfolio turnover, and investments may be sold without regard to length of time held when, in Nuveen Asset Management's opinion, investment considerations warrant such action. A higher portfolio turnover rate would result in correspondingly greater brokerage commissions and other transactional expenses that are borne by the Fund. Although these commissions and expenses are not reflected in the Fund's "Total Annual Expenses" disclosed in the Fund's most recent annual report on Form N-CSR, they will be reflected in the Fund's total return. In addition, high portfolio turnover may result in the realization of net short-term capital gains by the Fund which, when distributed to shareholders, will be taxable as ordinary income. See "Tax Matters."

Other Policies

Certain investment policies specifically identified in the SAI as such are considered fundamental and may not be changed without shareholder approval. See "Investment Restrictions" in the SAI.

Table of Contents

LIMITED TERM; ELIGIBLE TENDER OFFER

The Fund's Declaration of Trust provides that the Fund will have a limited period of existence and will terminate as of the close of business on the first business day of the month that follows the twelfth anniversary of the effective date of the initial registration statement of the Fund, which is September 1, 2032 (the "Stated Termination Date"); provided that the Board of Trustees may, in its sole discretion and without any action by the shareholders of the Fund, by vote of a majority of the then Board of Trustees with notice to the shareholders, extend the Fund's term for up to two one year periods (in the event that the term of the Fund has been so extended, the termination date shall be referred to as the "Extended Termination Date" and the later of the Stated Termination Date and the Extended Termination Date is referred to as the "Termination Date"); furthermore, notwithstanding the foregoing, the Board of Trustees may determine to cause the Fund to conduct an Eligible Tender Offer (as defined below). If the Eligible Tender Offer is completed, the Board of Trustees may, in its sole discretion and without any action by the shareholders of the Fund, by vote of a majority of the then Board of Trustees, provide that the Fund may continue without limitation of time, subject to the terms and conditions described below. If an Eligible Tender Offer is not conducted, the Fund will, no later than the Termination Date, cease investment operations, retire or redeem its leverage facilities, liquidate its investment portfolio (to the extent possible) and, on or after the Termination Date, the Fund will distribute all of its liquidated net assets to Common Shareholders of record in one or more distributions.

Eligible Tender Offer. The Declaration of Trust provides that an eligible tender offer (an "Eligible Tender Offer") is a tender offer by the Fund to all holders of outstanding Common Shares as of a date within the 6-18 months preceding the Termination Date. If the tender offer is completed, Shareholders who properly tender Common Shares in the Eligible Tender Offer will receive a purchase price equal to the NAV per share on the expiration date of the Eligible Tender Offer. In an Eligible Tender Offer, the Fund will offer to purchase all outstanding Common Shares held by each Common Shareholder. At the time of the Eligible Tender Offer, the Board of Trustees will determine the minimum net assets the Fund must retain following the Eligible Tender Offer to ensure the Fund's continued viability (the "Termination Threshold"). The Termination Threshold will be based on prevailing market conditions at the time of the Eligible Tender Offer.

If the number of Common Shares properly tendered in an Eligible Tender Offer would result in the Fund's net assets totaling greater than the Termination Threshold, the Fund will purchase all Common Shares properly tendered and not withdrawn pursuant to the terms of the Eligible Tender Offer and following the completion of such Eligible Tender Offer, the Board of Trustees may, in its sole discretion and without any action by the shareholders of the Fund, provide that the Fund may continue without limitation of time. See "Risks-Fund Level and Other Risks-Limited Term and Tender Offer Risks" as each such risk is contained in the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Principal Risks of the Funds." In making this decision, the Board of Trustees will take such actions with respect to the Fund's continued operations as it deems to be in the best interests of the Fund, based on market conditions at such time, the extent of Common Shareholder participation in the Eligible Tender Offer and all other factors deemed relevant by the Board of Trustees in consultation with Nuveen Fund Advisors, taking into account that Nuveen Fund Advisors may have a potential conflict of interest in seeking to convert the Fund to a fund with a continued existence without limitation of time.

If the number of properly tendered Common Shares would result in the Fund's net assets totaling less than the Termination Threshold if the Eligible Tender Offer were consummated, the Eligible Tender Offer will be terminated, no Common Shares will be repurchased pursuant to the Eligible Tender Offer and the Fund will begin (or continue) liquidating its investment portfolio and proceed to terminate on the Termination Date.

Any Eligible Tender Offer would be made, and Common Shareholders would be notified thereof, in accordance with the Declaration of Trust, the 1940 Act, the 1934 Act and the applicable tender offer rules thereunder (including Rule 13e-4 and Regulation 14E under the 1934 Act).

Termination, Liquidation. Unless the Fund's existence is continued without limitation of time, as described under "-Eligible Tender Offer" above, no later than the Termination Date, the Fund will cease investment operations, retire or redeem its leverage facilities, liquidate its investment portfolio (to the extent possible) and, on or after the Termination Date, the Fund will distribute all of its liquidated net assets to Common Shareholders of record in one or more distributions. In determining whether to extend the Fund's term, the Board of Trustees may consider a number of factors, including, without limitation, whether the Fund would be unable to sell its assets at favorable prices in a time frame consistent with the Termination Date due to lack of market liquidity or other adverse market conditions, or whether market conditions are such that it is reasonable to believe that, with an extension, the Fund's remaining assets would appreciate and generate income in an amount that, in the aggregate, is meaningful relative to the cost and expense of continuing the Fund's operations.

Nuveen Fund Advisors and Nuveen Asset Management will seek to manage the Fund's investment portfolio consistent with the Fund's obligation to cease operations on the Termination Date. To that end, Nuveen Fund Advisors and Nuveen Asset Management intend to seek municipal securities that they reasonably expect can be sold or otherwise exited at favorable prices on or before the Termination Date. However, there is no assurance that a market or other exit strategy will be available for the Fund's less liquid investments. As the Termination Date approaches, Nuveen Fund Advisors and Nuveen Asset Management expect to seek to liquidate the Fund's less liquid investments. As a result, based on prevailing market conditions, available investment opportunities and other factors, the Fund may invest the proceeds from the sale of such investments in money market mutual funds, cash, cash equivalents, securities issued or guaranteed by the U.S. government or its instrumentalities or agencies, high quality short-term money market instruments, short-term debt securities, certificates of deposit, bankers' acceptances and other bank obligations, commercial paper or other liquid debt securities. As a result, as the Termination Date approaches, the Fund's monthly cash distributions may decline, and there can be no assurance that the Fund will achieve its investment objective or that its investment strategies will be successful.

Depending on a variety of factors, including the performance of the Fund's investment portfolio over the period of its operations, the amount distributed to Common Shareholders in connection with its termination or paid to participating Common Shareholders upon completion of an Eligible Tender Offer may be less, and potentially significantly less, than such Common Shareholders' original investment. The Fund's final distribution to Common Shareholders on the Termination Date and the amount paid to participating Common Shareholders upon completion of an Eligible Tender Offer will be based upon the Fund's NAV at such time, and initial investors and any investors that purchase Common Shares after the completion of this offering may receive less, and potentially significantly less, than their original investment.

Because the Fund's assets will be liquidated in connection with its termination or to pay for Common Shares tendered in an Eligible Tender Offer, the Fund may be required to sell portfolio securities when it otherwise would not, including at times when market conditions are not favorable, which may cause the Fund to lose money. The Fund will make a distribution on the Termination Date of all cash raised from the liquidation of its assets prior to that time. However, given the nature of certain of the Fund's investments, the Fund may be unable to liquidate certain of its investments until the Termination Date. In this case, the Fund may make one or more additional distributions after the Termination Date of any cash received from the ultimate liquidation of those investments. This would delay distribution payments, perhaps for an extended period of time, and there can be no assurance that the total value of the cash distribution made on the Termination Date and such subsequent distributions, if any, will equal the Fund's NAV on the Termination Date, depending on the ultimate results of such post-Termination Date asset liquidations. If, as a result of lack of market liquidity or other adverse market conditions, the Board of Trustees determines it is in the best interests of the Fund, the Fund may transfer any portfolio investments that remain unsold on the Termination Date to a liquidating trust and distribute interests in such liquidating trust to Common Shareholders as part of the Fund's final distribution. Interests in the liquidating trust are expected to be nontransferable, except by operation of law. The liquidating trust will seek to liquidate such remaining investments for the benefit of the Common Shareholders as soon as practicable following the Termination Date. However, there can be no assurance as to the timing of or the value obtained from such liquidation. See "Risks-Fund Level and Other Risks-Limited Term and Tender Offer Risks." as each such risk is contained in the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Principal Risks of the Funds."

USE OF LEVERAGE

The Fund uses leverage to pursue its investment objective. The Fund may use leverage to the extent permitted by the 1940 Act. The Fund may source leverage through a number of methods including through issuing Preferred Shares, borrowings, the issuance of debt securities, entering into reverse repurchase agreements (effectively a borrowing), and investing in residual interest certificates of tender option bond trusts, also called inverse floating rate securities, that have the economic effect of leverage because the Fund's investment exposure to the underlying bonds held by the trust have been effectively financed by the trust's issuance of floating rate certificates. See "The Fund's Investments-Portfolio Composition-Municipal Securities-Inverse Floating Rate Securities" and "Investment Restrictions" in the SAI. For a discussion of risks, see "Portfolio Level Risks-Inverse Floating Rate Securities Risk" and "Fund Level and Other Risks-Reverse Repurchase Agreement Risk," as each such risk is contained in the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Principal Risks of the Funds." The Fund may also use certain derivatives and other forms of leverage that have the economic effect of leverage by creating additional investment exposure.

Currently, the Fund employs leverage through its outstanding MFP Shares which have seniority over the Common Shares. The Fund currently also invests in residual interest certificates of tender option bond trusts, also called inverse floating rate securities, that have the economic effect of leverage because the Fund's investment exposure to the underlying bonds held by the trust have been effectively financed by the trust's issuance of floating rate certificates.

The Fund may issue "senior securities" as defined under the 1940 Act. "Senior securities" include (i) the issuance of Preferred Shares; (ii) borrowings (including loans from financial institutions); and (iii) the issuance of debt securities. "Senior securities" have seniority over the Common Shares in regard to the income and assets of the Fund.

Reverse repurchase agreements involve the sale of securities held by the Fund with an agreement to repurchase the securities at an agreed-upon price, date and interest payment. Selling a portfolio security and agreeing to buy it back under a reverse repurchase agreement is economically equivalent to borrowing.

The Fund may use derivatives, such as interest rate swaps with varying terms, in order to hedge duration risk or manage the interest rate expense associated with all or a portion of its leverage. Interest rate swaps are bi-lateral agreements whereby parties agree to exchange future payments, typically based upon the differential of a fixed rate and a variable rate, on a specified notional amount. Interest rate swaps can enable the Fund to effectively convert its variable leverage expense to fixed, or vice-versa. For example, if the Fund issues leverage having a short-term floating rate of interest, the Fund could use interest rate swaps to hedge against a rise in the short-term benchmark interest rates associated with its outstanding leverage. In doing so, the Fund would seek to achieve lower leverage costs, and thereby enhance Common Share distributions, over an extended period, which would be the result if short-term market interest rates on average exceed the fixed interest rate over the term of the swap. To the extent the fixed swap rate is greater than short-term market interest rates on average over the period, overall costs associated with leverage will be greater (and thereby reduce distributions to Common Shareholders) than if the Fund had not entered into the interest rate swap(s).

The Fund also may borrow for temporary purposes as permitted by the 1940 Act.

In pursuit of its investment objective, the Fund has the ability to actively and dynamically reduce or increase the amount and type of leverage based upon changes in market conditions, composition of the Fund's holdings and remaining time until the Fund's Termination Date. The Fund's leverage ratio will vary from time to time based upon such changes in the amount of leverage used and variations in the value of the Fund's holdings. So long as the net income received from the Fund's investments purchased with leverage proceeds exceeds the then current expense of any leverage, the investment of the proceeds of leverage will generate more net income than if the Fund had not leveraged itself. Under these circumstances, the excess net income will be available to pay higher distributions to Common Shareholders. However, if the net income received from the Fund's portfolio investments purchased with the proceeds of leverage is less than the current expense of any leverage, the Fund may be required to utilize other Fund assets to make interest or dividend payments on its leveraging instruments which may result in a decline in Common Share NAV and reduced net investment income available for distribution to Common Shareholders.

The Fund pays a management fee to Nuveen Fund Advisors (which in turn pays a portion of such fee to Nuveen Asset Management) based on a percentage of Managed Assets. Managed Assets include the proceeds realized and managed from the Fund's use of most types of leverage (excluding the leverage exposure attributable to the use of futures, swaps and similar derivatives). Because Managed Assets include the Fund's net assets as well as assets that are attributable to the Fund's investment of the proceeds of its leverage, it is anticipated that the Fund's Managed Assets will be greater than its net assets. Nuveen Fund Advisors and Nuveen Asset Management are responsible for using leverage to pursue the Fund's investment objective. Nuveen Fund Advisors and Nuveen Asset Management will base their decision regarding whether and how much leverage to use for the Fund, and the terms of that leverage, on their assessment of whether such use of leverage is in the best interests of the Fund. However, a decision to employ or increase leverage will have the effect, all other things being equal, of increasing Managed Assets and in turn Nuveen Fund Advisors' and Nuveen Asset Management's management fees. Thus, Nuveen Fund Advisors and Nuveen Asset Management may have a conflict of interest in determining whether to use or increase leverage. Nuveen Fund Advisors and Nuveen Asset Management will seek to manage that potential conflict by using leverage only when they determine that it would be in the best interests of the Fund and its Common Shareholders, and by periodically reviewing with the Board of Trustees the Fund's performance and the Fund's degree of overall use of leverage and the impact of the use of leverage on that performance.

Table of Contents

The 1940 Act generally defines a "senior security" as any bond, debenture, note, or similar obligation or instrument constituting a security and evidencing indebtedness, and any stock of a class having priority over any other class as to distribution of assets or payment of dividends; however, the term does not include any promissory note or other evidence of indebtedness issued in consideration of any loan, extension, or renewal thereof, made for temporary purposes and in an amount not exceeding five percent of the value of the Fund's total assets. A loan shall be presumed to be for temporary purposes if it is repaid within 60 days and is not extended or renewed.

Under the 1940 Act, the Fund is not permitted to issue "senior securities" that are Preferred Shares if, immediately after the issuance of Preferred Shares, the asset coverage ratio with respect to such Preferred Shares would be less than 200%. With respect to any such Preferred Shares, asset coverage means the ratio which the value of the total assets of the Fund, less all liabilities and indebtedness not represented by senior securities, bears to the aggregate amount of senior securities representing indebtedness of the Fund plus the aggregate liquidation preference of such Preferred Shares.

Under the 1940 Act, the Fund is not permitted to issue "senior securities representing indebtedness" if, immediately after the issuance of such senior securities representing indebtedness, the asset coverage ratio with respect to such senior securities would be less than 300%. "Senior securities representing indebtedness" include borrowings (including loans from financial institutions) and debt securities. "Senior securities representing indebtedness" also include other derivative investments or transactions, such as reverse repurchase agreements, to the extent the Fund has not fully covered, segregated or earmarked cash or liquid assets in accordance with the 1940 Act, the rules thereunder, and applicable positions of the SEC and its staff. With respect to any such senior securities representing debt, asset coverage means the ratio which the value of the total assets of the Fund, less all liabilities and indebtedness not represented by senior securities (as defined in the 1940 Act), bears to the aggregate amount of such borrowing represented by senior securities issued by the Fund.

If the Fund issues senior securities and the asset coverage with respect to such senior securities declines below the required ratios discussed above (as a result of market fluctuations or otherwise), the Fund may sell portfolio securities when it may be disadvantageous to do so.

Certain types of leverage used by the Fund may result in the Fund being subject to certain covenants, asset coverage or other portfolio composition limits by its lenders, debt or preferred securities purchasers, rating agencies that may rate the debt or preferred securities, or reverse repurchase counterparties. Such limitations may be more stringent than those imposed by the 1940 Act and may impact whether the Fund is able to maintain its desired amount of leverage. At this time Nuveen Fund Advisors does not believe that any such potential investment limitations will impede it from managing the Fund's portfolio in accordance with its investment objective and policies.

Utilization of leverage is a speculative investment technique and involves certain risks to the Common Shareholders, including increased variability of the Fund's net income, distributions and NAV in relation to market changes. See "Leverage Risk," as such risk is contained in the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Principal Risks of the Funds-Fund Level and Other Risks." There is no assurance that the Fund will use leverage or that the Fund's use of leverage will work as planned or achieve its goals.

Effects of Leverage

Please refer to the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Effects of Leverage," as such may be supplemented from time to time, which is incorporated by reference herein, for a discussion of the effects of leverage.

Table of Contents

RISK FACTORS

Risk is inherent in all investing. Investing in any investment company security involves risk, including the risk that you may receive little or no return on your investment or even that you may lose part or all of your investment. Please refer to the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Current Investment Objectives, Investment Policies and Principal Risks of the Funds-Principal Risks of the Funds," as such principal risks may be supplemented from time to time, which is incorporated by reference herein, for a discussion of the principal risks you should consider before making an investment in the Fund. The specific risks applicable to a particular offering of Securities will be set forth in the related prospectus supplement.

MANAGEMENT OF THE FUND

Trustees and Officers

The Board of Trustees is responsible for the management of the Fund, including supervision of the duties performed by Nuveen Fund Advisors and Nuveen Asset Management. The names and business addresses of the trustees and officers of the Fund and their principal occupations and other affiliations during the past five years are set forth under "Management of the Fund" in the SAI.

Investment Adviser, Sub-Adviser and Portfolio Managers

Investment Adviser. Nuveen Fund Advisors, LLC, the Fund's investment adviser, is responsible for overseeing the Fund's overall investment strategy and implementation. Nuveen Fund Advisors offers advisory and investment management services to a broad range of investment company clients. Nuveen Fund Advisors has overall responsibility for management of the Fund, oversees the management of the Fund's portfolio, manages the Fund's business affairs and provides certain clerical, bookkeeping and other administrative services. Nuveen Fund Advisors is located at 333 West Wacker Drive, Chicago, Illinois 60606. Nuveen Fund Advisors is an indirect subsidiary of Nuveen, the investment management arm of TIAA. TIAA is a life insurance company founded in 1918 by the Carnegie Foundation for the Advancement of Teaching and is the companion organization of College Retirement Equities Fund. As of June 30, 2024, Nuveen managed approximately $1.2 trillion in assets, of which approximately $145.5 billion was managed by Nuveen Fund Advisors.

Sub-Adviser. Nuveen Asset Management, LLC, 333 West Wacker Drive, Chicago, Illinois 60606, serves as the Fund's sub-adviser pursuant to a sub-advisory agreement between Nuveen Fund Advisors and Nuveen Asset Management (the "Sub-Advisory Agreement"). Nuveen Asset Management, a registered investment adviser, is a wholly owned subsidiary of Nuveen Fund Advisors. Nuveen Asset Management oversees day-to-day investment operations of the Fund. Pursuant to the Sub-Advisory Agreement, Nuveen Asset Management is compensated for the services it provides to the Fund with a portion of the management fee Nuveen Fund Advisors receives from the Fund. Nuveen Fund Advisors and Nuveen Asset Management retain the right to reallocate investment advisory responsibilities and fees between themselves in the future.

Portfolio Managers. Nuveen Asset Management is responsible for the execution of specific investment strategies and day-to-day investment operations of the Fund. Nuveen Asset Management manages the Nuveen funds using a team of analysts and portfolio managers that focuses on a specific group of funds. The day-to-day operation of the Fund and the execution of its specific investment strategies is the primary responsibility of Daniel J. Close, Stephen J. Candido, and Timothy T. Ryan, the designated portfolio managers of the Fund. Messrs. Close and Candido have served as portfolio managers of the Fund since April 2023 and Mr. Ryan has served as a portfolio manager of the Fund since August 2020.

Daniel J. Close, CFA, Managing Director at Nuveen Asset Management, leads the municipal fixed income strategic direction and investment perspectives forNuveen. He serves as lead portfolio manager for high yield municipal strategies, along with tax-exempt and taxable municipal strategies that include customizedinstitutional portfolios, open-end funds and closed-end funds. Prior to his current role, in 2010, helped establish and expand the platform as Head of Taxable Municipals,and he has deep experience serving clients worldwide. He helps set direction for custom fixed income solutions and asset allocation across multi-sector portfolios. As aleading expert on taxable municipals, he serves as a trusted voice on the complexities of the taxable municipal market. After joining Nuveen in 2000, he was a municipalfixed income research analyst covering the corporate-backed, energy, transportation and utility sectors. He began working in the investment industry in 1998 as an analystat Banc of America Securities. He received his BS in Business from Miami University and his MBA from Northwestern University's J. L. Kellogg School ofManagement. Mr. Close has earned the Chartered Financial Analyst designation and is a member of the CFA Institute and the CFA Society of Chicago.

Table of Contents

Stephen J. Candido, CFA, Managing Director at Nuveen Asset Management, is a portfolio manager for high yield municipal strategies at Nuveen, managing high yield funds and institutional accounts. He also has responsibility for tax-exempt open-end funds and closed-end funds that allocate to both investment grade and high yield municipals. Stephen started working in the investment industry in 1996 when he joined Nuveen in the unit trust division. Prior to his current role, he was a vice president and senior research analyst specializing in high yield sectors including land secured credits, project finance and housing. Stephen was also an assistant vice president for Nuveen's global structured products team beginning in 2005. He also served as the manager of the fixed income unit trust product management and pricing group starting in 2001 and prior to that held positions as an equity research analyst and fixed income pricing analyst. Stephen graduated with a B.S. in Finance from Miami University and an M.B.A. in Finance from the University of Illinois at Chicago. He holds the Chartered Financial Analyst designation and is a member of the CFA Institute and the CFA Society of Chicago.

Timothy T. Ryan, CFA, Managing Director at Nuveen Asset Management, is a portfolio manager for the firm's SPDR Nuveen Exchange Traded Funds (ETFs) as well as several institutional portfolios. He is also the lead portfolio manager for the Strategic Municipal Opportunities strategy and co-manager for the All American Municipal Bond strategy. Tim joined Nuveen Asset Management as a portfolio manager in 2010 when the firm entered into a sub-advisory agreement with State Street Global Advisors. His portfolio management responsibilities have included overseeing a number of mutual funds as well as separately managed accounts for institutions and individuals. He began his municipal career in 1983 in public finance and switched to asset management in 1991 as a research analyst for Scudder, Stevens and Clark. During his investment management career, he has held positions in credit research, trading and portfolio management at various firms including State Street Global Advisors. Mr. Ryan graduated with a B.S. from the University of Wisconsin and a M.A. in Management from the J.L. Kellogg Graduate School of Management at Northwestern University. Mr. Ryan also holds the Chartered Financial Analyst designation and is a member of the CFA Institute.

Additional information about the Portfolio Managers' compensation, other accounts managed by the Portfolio Managers and the Portfolio Managers' ownership of securities in the Fund is provided in the SAI. The SAI is available free of charge by calling (800) 257-8787or by visiting the Fund's website at www.nuveen.com. The information contained in, or that can be accessed through, the Fund's website is not part of this Prospectus or the SAI, except to the extent specifically incorporated by reference herein or in the SAI.

Investment Management and Sub-AdvisoryAgreements

Investment Management Agreement. Pursuant to an investment management agreement between Nuveen Fund Advisors and the Fund (the "Investment Management Agreement"), the Fund has agreed to pay an annual management fee for the services and facilities provided by Nuveen Fund Advisors, payable on a monthly basis, based on the sum of a fund-level fee and a complex-level fee, as described below.

Fund-Level Fee. The annual fund-level fee for the Fund, payable monthly, is calculated according to the following schedule:

Table of Contents

Complex-Level Fee. The overall complex-level fee, payable monthly, begins at a maximum rate of 0.1600% of the Fund's average daily managed assets, with breakpoints for eligible complex-level assets above $124.3 billion. Therefore, the maximum management fee rate for the Fund is the Fund-level fee plus 0.1600%. The current overall complex-level fee schedule is as follows:

As of July 31, 2024, the complex-level fee rate for the Fund was 0.1572%.

In addition to the fee of Nuveen Fund Advisors, the Fund pays all other costs and expenses of its operations, including compensation of its trustees (other than those affiliated with Nuveen Fund Advisors and Nuveen Asset Management), custodian, transfer agency and dividend disbursing expenses, legal fees, expenses of independent auditors, expenses of repurchasing shares, expenses associated with any borrowings, expenses of issuing any Preferred Shares, expenses of preparing, printing and distributing shareholder reports, notices, proxy statements and reports to governmental agencies, and taxes, if any. All fees and expenses are accrued daily and deducted before payment of dividends to investors.

A discussion regarding the basis for the Board of Trustees' most recent approval of the Investment Management Agreement for the Fund may be found in the Fund's annual report to shareholders dated October 31 of each year.

Sub-AdvisoryAgreement. Pursuant to the Sub-AdvisoryAgreement, Nuveen Asset Management receives from Nuveen Fund Advisors a management fee equal to 50% of the investment management fee paid on the Fund's average daily Managed Assets. Nuveen Fund Advisors and Nuveen Asset Management retain the right to reallocate investment advisory responsibilities and fees between themselves in the future.

Table of Contents

A discussion regarding the basis for the Board of Trustees' most recent approval of the Sub-Advisory Agreement may be found in the Fund's annual report to shareholders dated October 31 of each year.

NET ASSET VALUE

The Fund's NAV per Common Share is determined as of the close of trading (normally 4:00 p.m. Eastern time) on each day the NYSE is open for business. NAV is calculated by taking the market value of the Fund's total assets, less all liabilities, and dividing by the total number of Common Shares outstanding. The result, rounded to the nearest cent, is the NAV per share.

The Fund utilizes independent pricing services approved by the Board of Trustees to value portfolio instruments at their market value. Independent pricing services typically value non-equity portfolio instruments utilizing a range of market-based inputs and assumptions, including readily available market quotations obtained from broker-dealers making markets in such instruments, cash flows and transactions for comparable instruments. In valuing municipal securities, the pricing services may also consider, among other factors, the yields or prices of municipal securities of comparable quality, type of issue, coupon, maturity and rating and the obligor's credit characteristics considered relevant by the pricing service or Nuveen Fund Advisors. In pricing certain securities, particularly less liquid and lower quality securities, the pricing services may consider information about a security, its issuer or market activity provided by Nuveen Fund Advisors or Nuveen Asset Management.

If a price cannot be obtained from a pricing service or other pre-approvedsource, or if the Fund's valuation designee deems such price to be unreliable, or if a significant event occurs after the close of the local market but prior to the time at which the Fund's NAV is calculated, a portfolio instrument will be valued at its fair value as determined in good faith by the Fund's valuation designee. The Fund's valuation designee may determine that a price is unreliable in various circumstances. For example, a price may be deemed unreliable if it has not changed for an identified period of time, or has changed from the previous day's price by more than a threshold amount, and recent transactions and/or broker dealer price quotations differ materially from the price in question.

The Board of Trustees has designated Nuveen Fund Advisors as the Fund's valuation designee pursuant to Rule 2a-5 under the 1940 Act and delegated to Nuveen Fund Advisors the day-to-day responsibility of making fair value determinations. All fair value determinations made by Nuveen Fund Advisors are subject to review by the Board of Trustees. As a general principle, the fair value of a portfolio instrument is the amount that an owner might reasonably expect to receive upon the instrument's current sale. A range of factors and analysis may be considered when determining fair value, including relevant market data, interest rates, credit considerations and/or issuer specific news. However, fair valuation involves subjective judgments, and it is possible that the fair value determined for a portfolio instrument may be materially different from the value that could be realized upon the sale of that instrument.

DISTRIBUTIONS

The Fund pays regular monthly cash distributions to Common Shareholders (stated in terms of a fixed cents per Common Share dividend distribution rate which may be set from time to time). The Fund intends to distribute all or substantially all of its net investment income each year through its regular monthly distributions and to distribute realized capital gains at least annually. In addition, in any monthly period, to maintain its declared per common share distribution amount, the Fund may distribute more or less than its net investment income during the period. In the event the Fund distributes more than its net investment income, such distributions may also include realized gains and/or a return of capital.

To the extent that a distribution includes a return of capital the NAV per share may erode. A return of capital may occur, for example, when some or all of the money that you invested in the Fund is paid back to you. A return of capital distribution does not necessarily reflect the Fund's investment performance and should not be confused with "yield" or "income."

Table of Contents

If the Fund's distribution includes anything other than net investment income, the Fund will provide a notice to Common Shareholders of its best estimate of the distribution sources at the time of the distribution. These estimates may not match the final tax characterization (for the full year's distributions) contained in the Common Shareholders' 1099-DIVforms after the end of the year.

While the Fund intends to distribute all realized capital gains at least annually, the Fund may elect to retain all or a portion of any net capital gain (which is the excess of net long-term capital gain over net short-term capital loss) otherwise allocable to Common Shareholders and pay U.S. federal income tax on the retained gain. As provided under U.S. federal income tax law, Common Shareholders of record as of the end of the Fund's taxable year will include their share of the retained net capital gain in their income for the year as a long-term capital gain (regardless of their holding period in the common shares), and will be entitled to an income tax credit or refund for the federal income tax deemed paid on their behalf by the Fund. If the Fund's total distributions during a given year is an amount that exceeds the Fund's current and accumulated earnings and profits, the excess would be treated by Common Shareholders as return of capital for federal income tax purposes to the extent of the Common Shareholder's basis in their shares and thereafter as capital gain.

Distributions will be reinvested in additional shares under the Fund's Dividend Reinvestment Plan unless a shareholder elects to receive cash. The Fund reserves the right to change its distribution policy and the basis for establishing the rate of its monthly distributions at any time and may do so without prior notice to Common Shareholders.

DIVIDEND REINVESTMENT PLAN

Please refer to the section of the Fund's most recent annual report on Form N-CSR entitled "Shareholder Update-Dividend Reinvestment Plan," which is incorporated by reference herein, for a discussion of the Fund's dividend reinvestment plan.

PLAN OF DISTRIBUTION

The Fund may offer and sell Securities from time to time on an immediate, continuous or delayed basis, in one or more offerings under this Prospectus and a related prospectus supplement, on terms to be determined at the time of the offering. The Fund may offer and sell such Securities directly to one or more purchasers, to or through underwriters, through dealers or agents that the Fund designates from time to time, or through a combination of these methods. Sales of Securities may be made in transactions that are deemed to be "at the market" as defined in Rule 415 under the Securities Act of 1933, as amended (the "1933 Act"), including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange.

The prospectus supplement relating to any offering of Securities will describe the terms of such offering, including, as applicable:

The prospectus supplement relating to any Rights offering will set forth the number of Common Shares issuable upon the exercise of each Right (or number of Rights) and the other terms of such Rights offering.

Table of Contents

Direct Sales

The Fund may offer and sell Securities directly to, and solicit offers from, institutional investors or others who may be deemed to be underwriters as defined in the 1933 Act for any resales of Securities. In this case, no underwriters or agents would be involved. The Fund may use electronic media, including the Internet, to sell offered Securities directly. The Fund will describe the terms of any of those sales in a prospectus supplement.

By Agents

The Fund may offer and sell Securities through an agent or agents designated by the Fund from time to time. An agent may sell Securities it has purchased from the Fund as principal to other dealers for resale to investors and other purchasers, and may reallow all or any portion of the discount received in connection with the purchase from the Fund to the dealers. After the initial offering of Securities, the offering price (in the case of Securities to be resold at a fixed offering price), the concession and the discount may be changed.

By Underwriters

If any underwriters are involved in the offer and sale of Securities, such Securities will be acquired by the underwriters and may be resold by them, either at a fixed public offering price established at the time of offering or from time to time in one or more negotiated transactions or otherwise, at prices related to prevailing market prices determined at the time of sale. Unless otherwise set forth in the applicable prospectus supplement, the obligations of the underwriters to purchase Securities will be subject to conditions precedent and the underwriters will be obligated to purchase all Securities described in the prospectus supplement if any are purchased. Any initial public offering price and any discounts or concessions allowed or re-allowedor paid to underwriters may be changed from time to time.

In connection with an offering of Common Shares, if a prospectus supplement so indicates, the Fund may grant the underwriters an option to purchase additional Common Shares at the public offering price, less the underwriting discounts and commissions, within 45 days from the date of the prospectus supplement, to cover any overallotments.

By Dealers

The Fund may offer and sell Securities from time to time through one or more dealers who would purchase the securities as principal. The dealers then may resell the offered Securities to the public at fixed or varying prices to be determined by those dealers at the time of resale. The Fund will set forth the names of the dealers and the terms of the transaction in the prospectus supplement.

General

Any underwriters, dealer or agent participating in an offering of Securities may be deemed to be an "underwriter," as that term is defined in the 1933 Act, of Securities so offered and sold, and any discounts and commission received by them, and any profit realized by them on resale of the offered Securities for whom they act as agent, may be deemed to be underwriting discounts and commissions under the 1933 Act.

Underwriters, dealers and agents may be entitled, under agreements entered into with the Fund, to indemnification by the Fund against some liabilities, including liabilities under the 1933 Act.

The Fund may offer to sell Securities either at a fixed price or at prices that may vary, at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices.

Table of Contents

To facilitate an offering of Common Shares in an underwritten transaction and in accordance with industry practice, the underwriters may engage in transactions that stabilize, maintain, or otherwise affect the market price of the Common Shares or any other Security. Those transactions may include overallotment, entering stabilizing bids, effecting syndicate covering transactions, and reclaiming selling concessions allowed to an underwriter or a dealer.

Any of these activities may stabilize or maintain the market price of the Securities above independent market levels. Underwriters are not required to engage in these activities and may end any of these activities at any time.

In connection with any Rights offering, the Fund may also enter into a standby underwriting arrangement with one or more underwriters pursuant to which the underwriter(s) will purchase Common Shares remaining unsubscribed for after the Rights offering.

Unless otherwise indicated in the prospectus supplement, each series of offered Preferred Shares will be a new issue of securities for which there currently is no market. Any underwriters to whom Preferred Shares are sold for public offering and sale may make a market in such Preferred Shares as permitted by applicable laws and regulations, but such underwriters will not be obligated to do so, and any such market making may be discontinued at any time without notice. Accordingly, there can be no assurance as to the development or liquidity of any market for the Preferred Shares.

Underwriters, agents and dealers may engage in transactions with or perform services, including various investment banking and other services, for the Fund and/or any of the Fund's affiliates in the ordinary course of business.

The maximum amount of compensation to be received by any Financial Industry Regulatory Authority ("FINRA") member or independent broker-dealer will not exceed the applicable FINRA limit for the sale of any securities being offered pursuant to Rule 415 under the Securities Act. We will not pay any compensation to any underwriter or agent in the form of warrants, options, consulting or structuring fees or similar arrangements.

To the extent permitted under the 1940 Act and the rules and regulations promulgated thereunder, the underwriters may from time to time act as a broker or dealer and receive fees in connection with the execution of the Fund's portfolio transactions after the underwriters have ceased to be underwriters and, subject to certain restrictions, each may act as a broker while it is an underwriter.

A prospectus and accompanying prospectus supplement in electronic form may be made available on the websites maintained by underwriters. The underwriters may agree to allocate a number of Securities for sale to their online brokerage account holders. Such allocations of Securities for Internet distributions will be made on the same basis as other allocations. In addition, Securities may be sold by the underwriters to securities dealers who resell Securities to online brokerage account holders.

Table of Contents

DESCRIPTION OF SHARES

Common Shares

The Declaration of Trust authorizes the issuance of an unlimited number of Common Shares. The Common Shares have a par value of $0.01 per share and, subject to the rights of holders of any Preferred Shares, have equal rights to the payment of dividends and the distribution of assets upon liquidation. The Common Shares when issued, are fully paid and, subject to matters discussed in "Certain Provisions in the Declaration of Trust and By-Laws," non-assessable, and have no preemptive or conversion rights or rights to cumulative voting. A copy of the Declaration of Trust is filed with the SEC as an exhibit to the Fund's registration statement of which this Prospectus is a part.

Each whole Common Share has one vote with respect to matters submitted for a vote by the Fund's Common Shareholders and on which the shareholder is entitled to vote, and each fractional share shall be entitled to a proportional fractional vote consistent with the requirements of the 1940 Act and the rules promulgated thereunder, and will vote together as a single class. Whenever the Fund incurs borrowings and/or Preferred Shares are outstanding, Common Shareholders will not be entitled to receive any cash distributions from the Fund unless all interest on such borrowings has been paid and all accumulated dividends on Preferred Shares have been paid, unless asset coverage (as defined in the 1940 Act) with respect to any borrowings would be at least 300% after giving effect to the distributions and asset coverage (as defined in the 1940 Act) with respect to Preferred Shares would be at least 200% after giving effect to the distributions. See "-Preferred Shares" below.

The Common Shares are listed on the NYSE and trade under the ticker symbol "NDMO." The Fund intends to hold annual meetings of shareholders so long as the Common Shares are listed on a national securities exchange and such meetings are required as a condition to such listing. The Fund does not issue share certificates.

Unlike open-end funds, closed-end funds like the Fund do not provide daily redemptions. Rather, if a shareholder determines to buy additional Common Shares or sell shares already held, the shareholder may conveniently do so by trading on the exchange through a broker or otherwise. Common shares of closed-end investment companies may frequently trade on an exchange at prices lower than NAV. Common shares of closed-end investment companies like the Fund have during some periods traded at prices higher than NAV and have during other periods traded at prices lower than NAV.

Because the market value of the Common Shares may be influenced by such factors as distribution levels (which are in turn affected by expenses), call protection, dividend stability, portfolio credit quality, NAV, relative demand for and supply of such shares in the market, general market and economic conditions, and other factors beyond the control of the Fund, the Fund cannot assure you that Common Shares will trade at a price equal to or higher than NAV in the future. The Common Shares are designed primarily for long-term investors, and investors in the Common Shares should not view the Fund as a vehicle for trading purposes. See "Repurchase of Fund Shares; Conversion to Open-End Fund."

Preferred Shares

The Fund's Declaration of Trust authorizes the issuance of an unlimited number of Preferred Shares in one or more classes or series, with rights as determined by the Board of Trustees, by action of the Board of Trustees without the approval of the Common Shareholders. As of July 31, 2024, there were 2,400 Preferred Shares outstanding. On June 8, 2022, the Fund issued 2,400 MFP Shares in a single series, Series A (the "Series A MFP Shares"). The Series A MFP Shares have various rights that were approved by the Board of Trustees without the approval of Common Shareholders, which are specified in the Fund's statement establishing and fixing the rights and preferences with respect to such Shares (each, a "Statement"). The discussion below generally describes the rights of the holders of Preferred Shares, including rights generally applicable to the holders of the Fund's outstanding MFP Shares, although the terms of any Preferred Shares that may be issued by the Fund may be the same as, or different from, the terms described below, subject to the applicable Statement, applicable law and the Declaration of Trust.

Table of Contents

Under the 1940 Act, the Fund is not permitted to issue "senior securities" that are Preferred Shares if, immediately after the issuance of Preferred Shares, the asset coverage ratio would be less than 200%. See "Leverage." Additionally, the Fund will generally not be permitted to purchase any of its Common Shares or declare dividends (except a dividend payable in Common Shares) or other distributions on its Common Shares unless, at the time of such purchase or declaration, the asset coverage ratio with respect to such Preferred Shares, after taking into account such purchase or distribution, is at least 200%. Preferred Shares issued by the Fund have priority over the Common Shares.

For so long as any Preferred Shares are outstanding, the Fund will not: (1) declare or pay any dividend or other distribution (other than a dividend or distribution paid in Common Shares) in respect of the Common Shares, (2) call for redemption, redeem, purchase or otherwise acquire for consideration any Common Shares, or (3) pay any proceeds of the liquidation of the Fund in respect of the Common Shares, unless, in each case, (A) immediately thereafter, the Fund shall be in compliance with the 200% asset coverage limitations set forth under the 1940 Act after deducting the amount of such dividend or other distribution or redemption or purchase price or liquidation proceeds and (B) all cumulative dividends and other distributions of shares of all series of Preferred Shares of the Fund due on or prior to the date of the applicable dividend, distribution, redemption, purchase or acquisition shall have been declared and paid.

Distribution Preference

The Fund's Preferred Shares have complete priority over the Common Shares as to distribution of assets.

Liquidation Preference

In the event of any voluntary or involuntary liquidation, dissolution or winding up of the affairs of the Fund, holders of Preferred Shares would be entitled to receive a preferential liquidating distribution (expected to equal the original purchase price per share plus accumulated and unpaid dividends thereon, whether or not earned or declared) before any distribution of assets is made to Common Shareholders. After payment of the full amount of the liquidating distribution to which they are entitled, holders of Preferred Shares will not be entitled to any further participation in any distribution of assets by the Fund. A consolidation or merger of the Fund with or into another entity or a sale of all or substantially all of the assets of the Fund shall not be deemed to be a liquidation, dissolution or winding up of the Fund.

Voting Rights

In connection with any issuance of Preferred Shares, the Fund must comply with Section 18(i) of the 1940 Act, which requires, among other things, that Preferred Shares be voting shares and have equal voting rights with Common Shares. Except with respect to certain matters affecting only the holders of the Preferred Shares and except as discussed further below, holders of Preferred Shares vote together with Common Shareholders as a single class on matters submitted to Fund shareholders.

In connection with the election of the Fund's trustees, holders of Preferred Shares, voting as a separate class, are entitled to elect two of the Fund's trustees, and the remaining trustees are elected by Common Shareholders and holders of Preferred Shares, voting together as a single class. In addition, if at any time dividends on the Fund's outstanding Preferred Shares are unpaid in an amount equal to two full years' dividends thereon, the holders of all outstanding Preferred Shares, voting as a separate class, would be entitled to elect a majority of the Fund's trustees until all dividends in arrears have been paid or declared and set apart for payment.

Table of Contents

The Statement with respect to each series of the Fund's Preferred Shares sets forth certain voting and consent rights of the holders of such Shares, including with respect to certain actions that would affect the preferences, rights, or powers of such class or series or the authorization or issuance of any class or series ranking prior to the Preferred Shares. Except as may otherwise be required by law, the Fund's Declaration of Trust requires that (1) the affirmative vote of the holders of at least two-thirds of the Fund's Preferred Shares outstanding at the time, voting as a separate class, would be required to approve any conversion of the Fund from a closed-end to an open-end investment company and (2) the affirmative vote of the holders of at least two-thirds of the outstanding Preferred Shares, voting as a separate class, would be required to approve any plan of reorganization (as such term is used in the 1940 Act) adversely affecting such shares; provided however, that such separate class vote would be a majority vote if the action in question has previously been approved, adopted or authorized by the affirmative vote of two-thirds of the total number of trustees fixed in accordance with the Declaration of Trust or the By-laws. The affirmative vote of the holders of a majority of the outstanding Preferred Shares, voting as a separate class, would be required to approve any action not described in the preceding sentence requiring a vote of security holders under Section 13(a) of the 1940 Act including, among other things, changes in the Fund's investment objective or changes in the investment restrictions described as fundamental policies under "Investment Restrictions" in the SAI. The class or series vote of holders of Preferred Shares described above would in each case be in addition to any separate vote of the requisite percentage of Common Shares and Preferred Shares necessary to authorize the action in question.

The foregoing voting provisions would not apply with respect to the Fund's Preferred Shares if, at or prior to the time when a vote was required, such shares have been (1) redeemed or (2) called for redemption and sufficient funds would have been deposited in trust to effect such redemption.

Redemption, Purchase and Sale of Preferred Shares

The terms of the Preferred Shares may provide that they are redeemable by the Fund at certain times, in whole or in part, at the liquidation preference of such share plus accumulated dividends, that the Fund may tender for or purchase Preferred Shares and that the Fund may subsequently resell any shares so tendered for or purchased. Any redemption or purchase of Preferred Shares by the Fund would reduce the leverage applicable to Common Shares, while any resale of such shares by the Fund would increase such leverage.

Table of Contents

RIGHTS OFFERINGS

The Fund may in the future, and at its discretion, choose to make offerings of Rights to its shareholders to purchase Common Shares. Rights may be issued independently or together with any other offered security and may or may not be transferable by the person purchasing or receiving the rights. In connection with a Rights offering to shareholders, the Fund would distribute certificates or other documentation evidencing the Rights and a prospectus supplement to the Fund's shareholders as of the record date that the Fund sets for determining the shareholders eligible to receive Rights in such Rights offering. Any such future Rights offering will be made in accordance with the 1940 Act and, to the extent such Rights are transferable, will comply with applicable interpretations of the SEC or its staff, as such interpretations may be modified in the future, which currently require that: (i) the Fund's Board of Trustees make a good faith determination that such offering would result in a net benefit to existing shareholders; (ii) the offering fully protects shareholders' preemptive rights and does not discriminate among shareholders (except for the possible effect of not offering fractional rights); (iii) management uses its best efforts to ensure an adequate trading market in the Rights for use by shareholders who do not exercise such Rights; and (iv) the ratio of such transferable Rights offering does not exceed one new share for each three rights held

The applicable prospectus supplement would describe the following terms of the Rights (to the extent each is applicable) in respect of which this Prospectus is being delivered:

A certain number of Rights would entitle the holder of the Right(s) to purchase for cash such number of shares at such exercise price as in each case is set forth in, or be determinable as set forth in, the prospectus supplement relating to the Rights offered thereby. Rights would be exercisable at any time up to the close of business on the expiration date for such Rights set forth in the prospectus supplement. After the close of business on the expiration date, all unexercised Rights would become void. Upon expiration of the Rights offering and the receipt of payment and the Rights certificate or other appropriate documentation properly executed and completed and duly executed at the corporate trust office of the Rights agent, or any other office indicated in the prospectus supplement, the Common Shares purchased as a result of such exercise will be issued as soon as practicable. To the extent permissible under applicable law, the Fund may determine to offer any unsubscribed offered securities directly to persons other than shareholders, to or through agents, underwriters or dealers or through a combination of such methods, as set forth in the applicable prospectus supplement.

Table of Contents

CERTAIN PROVISIONS IN THE DECLARATION OF TRUST AND BY-LAWS

General. The By-laws of the Fund provide that by becoming a shareholder of the Fund, each shareholder shall be deemed to have agreed to be bound by the terms of the Declaration of Trust and By-laws. However, neither the Declaration of Trust nor the By-laws purport to require the waiver of a shareholder's rights under the federal securities laws.

Shareholder and Trustee Liability. Under Massachusetts law, shareholders could, under certain circumstances, be held personally liable for the Fund's obligations. However, the Declaration of Trust contains an express disclaimer of shareholder liability for the Fund's debts or obligations and requires that notice of such limited liability be given in each agreement, obligation or instrument entered into or executed by the Fund or the trustees. The Declaration of Trust further provides for indemnification out of the Fund's assets and property for all loss and expense of any shareholder held personally liable for the Fund's obligations. Thus, the risk of a shareholder incurring financial loss on account of shareholder liability is limited to circumstances in which the Fund would be unable to meet its obligations. The Fund believes that the likelihood of such circumstances is remote.

The Declaration of Trust provides that the Fund's obligations are not binding upon the Fund's trustees individually, but only upon the Fund's assets and property, and that the trustees shall not be liable for errors of judgment or mistakes of fact or law. Nothing in the Declaration of Trust, however, protects a trustee against any liability to which the trustee would otherwise be subject by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of the trustee's office.

The Declaration of Trust provides that the Fund will have a limited period of existence and will terminate as of the Stated Termination Date; provided that the Board of Trustees may, in its sole discretion and without any action by the shareholders of the Fund, extend the Fund's term for up to two one year periods; furthermore, notwithstanding the foregoing, if the Board of Trustees determines to cause the Fund to conduct an Eligible Tender Offer, and the Eligible Tender Offer is completed, the Board of Trustees may, in its sole discretion and without any action by the shareholders of the Fund, provide that the Fund may continue without limitation of time, subject to the terms and conditions described herein. Unless the Fund's existence is continued without limitation of time as described herein on or before the Termination Date, the Fund will cease its investment operations, retire or redeem its leverage facilities, liquidate its investment portfolio (to the extent possible) and, on or after the Termination Date, the Fund will distribute all of its liquidated net assets to Common Shareholders of record in one or more distributions.

The Declaration of Trust provides that the Fund, or any class or series thereof, may be terminated at any time by the Board of Trustees by notice to the shareholders without a vote of the shareholders of the Fund.

The Declaration of Trust provides that an Eligible Tender Offer is a tender offer by the Fund to purchase up to 100% of the then-outstanding Common Shares as of a date within 6-18 months preceding the Termination Date. Shareholders who properly tender Common Shares in the Eligible Tender Offer will receive a purchase price equal to the NAV per share on the expiration date of the Eligible Tender Offer. The Declaration of Trust provides that, if the number of properly tendered Common Shares would result in the Fund exceeding the Termination Threshold, then the Board of Trustees may determine to provide that the Fund may continue without limitation of time. The Declaration of Trust provides that if net assets of the Fund would be less than the Termination Threshold following the completion of the Eligible Tender Offer, the tender offer will not be completed, no Common Shares will be purchased and the Fund will terminate as of the Termination Date.

Anti-Takeover Provisions. The Declaration of Trust and By-laws include provisions that could limit the ability of other entities or persons to acquire control of the Fund or to convert the Fund to open-end status. The By-laws require the Board of Trustees be divided into three classes with staggered terms. See "Management of the Fund" in the SAI. This provision of the By-laws could delay for up to two years the replacement of a majority of the Board of Trustees. When Preferred Shares are issued, holders of Preferred Shares, voting as a separate class, are entitled to elect two of the Fund's trustees. In addition, the Declaration of Trust requires a vote by holders of at least two-third of the Common Shares and, if issued, Preferred Shares, voting together as a single class, except as described below, to authorize (1) a conversion of the Fund from a closed-end to an open-end investment company, (2) a merger or consolidation of the Fund, or a series or class of the Fund, with any corporation, association, trust or other organization or a reorganization of the Fund, or a series or class of the Fund, (3) a sale, lease or transfer of all or substantially all of the Fund's assets (other than in the regular course of the Fund's investment activities), (4) in certain circumstances, a termination of the Fund, or a series or class of the Fund or (5) a removal of trustees by shareholders, and then only for cause, unless, with respect to (1) through (4), such transaction has already been authorized by the affirmative vote of two-thirds of the total number of trustees fixed in accordance with the Declaration of Trust or the By-laws, in which case the affirmative vote of the holders of at least a majority of the Fund's Common Shares and, if issued, Preferred Shares outstanding at the time, voting together as a single class, would be required; provided, however, that where only a particular class or series is affected (or, in the case of removing a trustee, when the trustee has been elected by only one class), only the required vote by the applicable class or series will be required. However, approval of shareholders would not be required for any transaction, whether deemed a merger, consolidation, reorganization or otherwise whereby the Fund issues shares in connection with the acquisition of assets (including those subject to liabilities) from any other investment company or similar entity. In the case of the conversion of the Fund to an open-end investment company, or in the case of any of the foregoing transactions constituting a plan of reorganization that adversely affects the holders of any outstanding Preferred Shares, the action in question also would require the affirmative vote of the holders of at least two-thirds of the Preferred Shares outstanding at the time, voting as a separate class, unless such transaction has already been authorized by the affirmative vote of two-thirds of the total number of trustees fixed in accordance with the Declaration of Trust or the By-laws, in which case the affirmative vote of the holders of at least a majority of the Fund's Preferred Shares outstanding at the time would be required. None of the foregoing provisions may be amended except by the vote of at least two-thirds of the Common Shares and any preferred shares voting together as a single class. The votes required to approve the conversion of the Fund from a closed-end to an open-end investment company or to approve transactions constituting a plan of reorganization which adversely affects the holders of preferred shares are higher than those required by the 1940 Act. The Board of Trustees believes that the provisions of the Declaration of Trust relating to such higher votes are in the best interest of the Fund and its shareholders.

Table of Contents

Procedural Requirements on Derivative Actions, Exclusive Jurisdiction and Jury Trial Waiver. The By-laws of the Fund contain certain provisions affecting potential shareholder claims against the Fund, including procedural requirements for derivative actions, an exclusive forum provision, and the waiver of shareholder rights to a jury trial. Massachusetts is considered a "universal demand" state, meaning that under Massachusetts corporate law a shareholder must make a demand on the company before bringing a derivative action (i.e., a lawsuit brought by a shareholder on behalf of the company). The By-laws of the Fund provide detailed procedures for the bringing of derivative actions by shareholders which are modeled on the substantive provisions of the Massachusetts corporate law derivative demand statute. The procedures are intended to permit legitimate inquiries and claims while avoiding the time, expense, distraction, and other harm that can be caused to the Fund or its shareholders as a result of spurious shareholder demands and derivative actions. Among other things, these procedures:

These procedures may be more restrictive than procedures for bringing derivative suits applicable to other investment companies.

The By-laws also require that actions by shareholders against the Fund, except for actions under the U.S. federal securities laws, be brought only in a certain federal court in Massachusetts, or if not permitted to be brought in federal court, then in the Business Litigation Session of the Massachusetts Superior Court in Suffolk County (the "Exclusive Jurisdictions"), and that the right to jury trial be waived to the fullest extent permitted by law. Other investment companies may not be subject to similar restrictions. The designation of Exclusive Jurisdictions may make it more expensive for a shareholder to bring a suit than if the shareholder were permitted to select another jurisdiction. Also, the designation of Exclusive Jurisdictions and the waiver of jury trials limit a shareholder's ability to litigate a claim in the jurisdiction and in a manner that may be more favorable to the shareholder. It is possible that a court may choose not to enforce these provisions of the Fund's By-laws.

Table of Contents

Preemptive Rights. The Declaration of Trust provides that Common Shareholders shall have no right to acquire, purchase or subscribe for any shares or investments of the Fund, other than such right, if any, as the Fund's Board of Trustees in its discretion may determine. As of the date of this Prospectus, no preemptive rights have been granted by the Board of Trustees.

Reference should be made to the Declaration of Trust and By-laws on file with the SEC for the full text of these provisions.

REPURCHASE OF FUND SHARES; CONVERSION TO OPEN-ENDFUND

The Fund is a closed-end investment company and as such its shareholders will not have the right to cause the Fund to redeem their shares. Instead, the Common Shares will trade in the open market at a price that will be a function of several factors, including dividend levels (which are in turn affected by expenses), NAV, call protection, dividend stability, portfolio credit quality, relative demand for and supply of such shares in the market, general market and economic conditions and other factors. Because shares of closed-end investment companies may frequently trade at prices lower than NAV, the Fund's Board of Trustees has currently determined that, at least annually, it will consider action that might be taken to reduce or eliminate any material discount from NAV in respect of Common Shares, which may include the repurchase of such shares in the open market or in private transactions, the making of a tender offer for such shares at NAV, or the conversion of the Fund to an open-end investment company. The Fund cannot assure you that its Board of Trustees will decide to take any of these actions, or that share repurchases or tender offers will actually reduce market discount.

If the Fund converted to an open-endinvestment company, it would be required to redeem all Preferred Shares, including MFP Shares, then outstanding (requiring in turn that it liquidate a portion of its investment portfolio), and the Common Shares would no longer be listed on the NYSE or elsewhere and it would likely have to significantly reduce any leverage it is then employing, which may require a repositioning of its investment portfolio, which may in turn generate substantial transaction costs, which would be borne by Common Shareholders, and may adversely affect Fund performance and Fund distributions. In contrast to a closed-endinvestment company, shareholders of an open-endinvestment company may require the company to redeem their shares at any time (except in certain circumstances as authorized by the 1940 Act or the rules thereunder) at their NAV, less any redemption charge that is in effect at the time of redemption. The Fund currently expects that any such redemptions would be made in cash. The Fund may charge sales or redemption fees upon conversion to an open-endfund. In order to avoid maintaining large cash positions or liquidating favorable investments to meet redemptions, open-endinvestment companies typically engage in a continuous offering of their shares. Open-endinvestment companies are thus subject to periodic asset in-flowsand out-flowsthat can complicate portfolio management. The Board of Trustees may at any time propose conversion of the Fund to an open-endinvestment company depending upon its judgment as to the advisability of such action in light of circumstances then prevailing.

Before deciding whether to take any action if the Common Shares trade below NAV, the Fund's Board of Trustees would consider all relevant factors, including the extent and duration of the discount, the liquidity of the Fund's portfolio, the impact of any action that might be taken on the Fund or its shareholders, and market considerations. Based on these considerations, even if the Fund's shares should trade at a discount, the Board of Trustees may determine that, in the interest of the Fund and its shareholders, no action should be taken.

Table of Contents

TAX MATTERS

The following information is meant as a general summary for U.S. shareholders. This summary does not discuss the tax consequences of an investment in Rights or Preferred Shares. Please see the SAI for additional information. Investors should rely on their own tax adviser for advice about the particular federal, state and local tax consequences to them of investing in the Fund.

The Fund has elected and intends to qualify each year to be treated as a regulated investment company ("RIC") under Subchapter M of the Internal Revenue Code of 1986, as amended. In order to qualify for treatment as a RIC, the Fund must satisfy certain requirements regarding the sources of its income, the diversification of its assets and the distribution of its income. As a RIC, the Fund is not expected to be subject to federal income tax. The Fund primarily invests in municipal securities issued by states, cities and local authorities and certain possessions and territories of the United States (such as Puerto Rico or Guam) or municipal securities whose income is otherwise exempt from regular federal income taxes. To qualify to pay exempt-interest dividends, which are treated as items of interest excludable from gross income for federal income tax purposes, at least 50% of the value of the total assets of the Fund must consist of obligations exempt from regular income tax as of the close of each quarter of the Fund's taxable year. If the proportion of taxable investments held by the Fund exceeds 50% of the Fund's total assets as of the close of any quarter of any Fund taxable year, the Fund would not for that taxable year satisfy the general eligibility test that would otherwise permit it to pay exempt-interest dividends. A shareholder treats an exempt-interest dividend as interest on state and local bonds exempt from regular federal income tax. Federal income tax law imposes an alternative minimum tax. Interest on certain municipal securities, such as certain private activity bonds, is included as an item of tax preference in determining the amount of a taxpayer's alternative minimum taxable income. To the extent that the Fund receives income from such municipal securities, a portion of the dividends paid by the Fund, although exempt from regular federal income tax, will be taxable to shareholders whose tax liabilities are determined under the federal alternative minimum tax. The Fund will annually provide a report indicating the percentage of the Fund's income attributable to municipal securities and the percentage includable in federal alternative minimum taxable income.

In addition to exempt-interest dividends, the Fund may also distribute to its shareholders amounts that are treated as long-term capital gain or ordinary income (which may include short-term capital gains). These distributions are generally subject to regular federal income tax, whether or not reinvested in additional shares. Capital gain distributions are generally taxable at rates applicable to long-term capital gains regardless of how long a shareholder has held its shares. Long-term capital gains are currently taxable to non-corporate shareholders at rates of up to 20%. The Fund does not expect that any part of its distributions to shareholders from its investments will qualify for the dividends-received deduction available to corporate shareholders or as "qualified dividend income," which is taxable to non-corporate shareholders at preferential U.S. federal income tax rates.

A 3.8% Medicare contribution tax generally applies to all or a portion of the net investment income of a shareholder who is an individual and not a nonresident alien for U.S. federal income tax purposes and who has adjusted gross income (subject to certain adjustments) that exceeds a threshold amount ($250,000 if married filing jointly or if considered a "surviving spouse" for federal income tax purposes, $125,000 if married filing separately, and $200,000 in other cases). This 3.8% tax also applies to all or a portion of the undistributed net investment income of certain shareholders that are estates and trusts. For these purposes, interest, dividends, and certain capital gains are generally taken into account in computing a shareholder's net investment income, but exempt-interest dividends are not taken into account.

As a RIC, the Fund will not be subject to federal income tax in any taxable year provided that it meets certain requirements. As described in "Distributions" above, the Fund may retain for investment some (or all) of its net capital gain. If the Fund retains any net capital gain or taxable net investment income, it will be subject to tax at the regular corporate rate on the amount retained. If the Fund retains any net capital gain, it may designate the retained amount as undistributed capital gains in a notice to its shareholders who, if subject to federal income tax on long-term capital gains, (i) will be required to include in income for federal income tax purposes, as long-term capital gain, their share of such undistributed amount; (ii) will be deemed to have paid their proportionate shares of the tax paid by the Fund on such undistributed amount and will be entitled to credit that amount of tax against their federal income tax liabilities, if any; and (iii) will be entitled to claim refunds to the extent the credit exceeds such liabilities. For federal income tax purposes, the tax basis of shares owned by a shareholder of the Fund will be increased by an amount equal to the difference between the amount of undistributed capital gains included in the shareholder's gross income and the tax deemed paid by the shareholder.

Table of Contents

Dividends declared by the Fund in October, November or December, payable to shareholders of record in such a month, and paid during the following January will be treated as having been received by shareholders in the year the distributions were declared.

Each shareholder will receive an annual statement summarizing the U.S. federal income tax status of all distributions.

The repurchase, sale or exchange of Common Shares normally will result in capital gain or loss to holders of Common Shares who hold their shares as capital assets. Generally a shareholder's gain or loss will be long-term capital gain or loss if the shares have been held for more than one year even though the increase in value in such Common Shares may be at least partly attributable to tax-exempt interest income. Present law taxes both long-term and short-term capital gains of corporations at the rates applicable to ordinary income. For non-corporate taxpayers, however, long-term capital gains are currently taxed at rates of up to 20%. Short-term capital gains and other ordinary income are taxed to non-corporate taxpayers at ordinary income rates. If a shareholder sells or otherwise disposes of Common Shares before holding them for six months, any loss on the sale or disposition will be treated as a long-term capital loss to the extent of any amounts treated as distributions to the Common Shareholder of long-term capital gain (including any amount credited to the shareholder as undistributed capital gain) or (2) disallowed to the extent of exempt interest dividends received by a Common Shareholder. Any loss realized by a shareholder on the disposition of shares held 6 months or less is disallowed to the extent of the amount of exempt-interest dividends received by the shareholder with respect to Common Shares. Any loss realized on a sale or exchange of shares of the Fund will be disallowed to the extent those shares of the Fund are replaced by substantially identical shares of the Fund (including shares acquired by reason of participation in the Plan) within a period of 61 days beginning 30 days before and ending 30 days after the date of disposition of the original shares, or to the extent the shareholder enters into a contract or option to repurchase shares within such period. In that event, the basis of the replacement shares of the Fund will be adjusted to reflect the disallowed loss.

Any interest on indebtedness incurred or continued to purchase or carry the Fund's shares to which exempt-interest dividends are allocated is not deductible. Under certain applicable rules, the purchase or ownership of shares may be considered to have been made with borrowed funds even though such funds are not directly used for the purchase or ownership of the shares. In addition, if you receive social security or certain railroad retirement benefits, you may be subject to U.S. federal income tax on a portion of such benefits as a result of receiving investment income, including exempt-interest dividends and other distributions paid by the Fund.

The Fund may be required to withhold (as "backup withholding") U.S. federal income tax from distributions (including exempt-interest dividends) and repurchase proceeds payable to a shareholder if the shareholder fails to provide the Fund with his or her correct taxpayer identification number or to make required certifications, or if the shareholder has been notified by the IRS that he or she is subject to backup withholding. The backup withholding rate is 24%. Backup withholding is not an additional tax; rather, it is a way in which the IRS ensures it will collect taxes otherwise due. Any amounts withheld may be credited against a shareholder's U.S. federal income tax liability.

The Fund may invest in municipal securities that pay interest that is taxable under the federal alternative minimum tax. If you are, or as a result of investment in the Fund would become, subject to the federal alternative minimum tax, the Fund may not be a suitable investment for you. In addition, distributions of taxable ordinary income (including any net short-term capital gain) will be taxable to shareholders as ordinary income (and not eligible for favorable taxation as "qualified dividend income"), and capital gain dividends will be taxable as long-term capital gains.

State and Local Tax Matters. The exemption from U.S. federal income tax for exempt-interest dividends generally does not result in exemption for such dividends under the income or other tax laws of any state or local taxing authority. In some states, however, the portion of any exempt-interest dividends derived from interest received by the Fund on its holdings of that state's securities and those of its political subdivisions and instrumentalities is exempt from the state's income tax. The Fund will report annually to its shareholders the percentage of interest income earned by the Fund during the preceding year on tax-exempt obligations indicating, on a state-by-state basis, the source of such income. Shareholders of the Fund are advised to consult their own tax advisors about state and local tax matters.

CUSTODIAN AND TRANSFER AGENT

The custodian of the assets of the Fund is State Street Bank and Trust Company, One Congress Street, Suite 1, Boston, Massachusetts 02114-2016 (the "Custodian"). The Custodian performs custodial, fund accounting and portfolio accounting services. The Fund's transfer, shareholder services and dividend paying agent with respect to the Fund's Common Shares is Computershare Inc. and Computershare Trust Company, N.A., located at 150 Royall Street, Canton, Massachusetts 02021. The transfer agent, tender and dividend paying agent and calculation agent for any Preferred Shares, will be identified in the applicable prospectus supplement.

Table of Contents

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

KPMG LLP, an independent registered public accounting firm, provides auditing services to the Fund. The principal business address of KPMG LLP is 200 East Randolph Street, Chicago, IL 60601.

LEGAL MATTERS

Certain legal matters in connection with the offering will be passed upon for the Fund by Stradley Ronon Stevens & Young, LLP, located at 2005 Market Street, Suite 2600, Philadelphia, Pennsylvania. Stradley Ronon Stevens & Young, LLP may rely as to certain matters of Massachusetts law on the opinion of Morgan, Lewis & Bockius LLP. Any additional legal opinions will be described in a prospectus supplement.

AVAILABLE INFORMATION

The Fund is subject to the informational requirements of the Securities Exchange Act of 1934, as amended (the "Exchange Act") and the 1940 Act and is required to file reports, proxy statements and other information with the SEC. Reports, proxy statements, and other information about the Fund can be inspected at the offices of the NYSE.

This Prospectus does not contain all of the information in the Fund's Registration Statement, including amendments, exhibits, and schedules. Statements in this Prospectus about the contents of any contract or other document are not necessarily complete and, in each instance, reference is made to the copy of the contract or other document filed as an exhibit to the Registration Statement, each such statement being qualified in all respects by this reference.

Additional information about the Fund and the Securities can be found in the Fund's Registration Statement (including amendments, exhibits, and schedules) on Form N-2filed with the SEC. The SEC maintains a website (http://www.sec.gov) that contains the Fund's Registration Statement, other documents incorporated by reference, and other information the Fund has filed electronically with the SEC, including proxy statements and reports filed under the Exchange Act.

INCORPORATION BY REFERENCE

The documents listed below, and any reports and other documents subsequently filed with the SEC pursuant to Section 30(b)(2) of the 1940 Act and Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act prior to the termination of the offering will be incorporated by reference into this Prospectus and deemed to be part of this Prospectus from the date of the filing of such reports and documents:

The information incorporated by reference is considered to be part of this Prospectus, and later information that the Fund files with the SEC will automatically update and supersede this information. Incorporated materials not delivered with the Prospectus may be obtained, without charge, by calling (800) 257-8787,by writing to the Fund at 333 West Wacker Drive, Chicago, Illinois 60606, or from the Fund's website (http://www.nuveen.com).