SEC Form N-CSRS filed by AllianceBernstein National Municipal Income Fund Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number: 811-10573

ALLIANCEBERNSTEIN NATIONAL MUNICIPAL INCOME FUND, INC.

(Exact name of registrant as specified in charter)

1345 Avenue of the Americas, New York, New York 10105

(Address of principal executive offices) (Zip code)

Stephen M. Woetzel

AllianceBernstein L.P.

1345 Avenue of the Americas

New York, New York 10105

(Name and address of agent for service)

Registrant’s telephone number, including area code: (800) 221-5672

Date of fiscal year end: October 31, 2024

Date of reporting period: April 30, 2024

APR^04.30.24

SEMI-ANNUAL REPORT

ALLIANCEBERNSTEIN
NATIONAL MUNICIPAL INCOME FUND
(NYSE: AFB)

You may obtain a description of the Fund’s proxy voting policies and procedures, and information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30, without charge. Simply visit AB’s website at www.abfunds.com, or go to the Securities and Exchange Commission’s (the “Commission”) website at www.sec.gov, or call AB at (800) 227 4618.

The Fund files its complete schedule of portfolio holdings with the Commission for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. The Fund’s Form N-PORT reports are available on the Commission’s website at www.sec.gov.

AllianceBernstein Investments, Inc. (ABI) is the distributor of the AB family of mutual funds. ABI is a member of FINRA and is an affiliate of AllianceBernstein L.P., the Adviser of the funds.

The [A/B] logo is a registered service mark of AllianceBernstein and AllianceBernstein^® is a registered service mark used by permission of the owner, AllianceBernstein L.P.

FROM THE PRESIDENT

Dear Shareholder,

We’re pleased to provide this report for the AllianceBernstein National Municipal Income Fund, Inc. (the “Fund”). Please review the discussion of Fund performance, the market conditions during the reporting period and the Fund’s investment strategy.

At AB, we’re striving to help our clients achieve better outcomes by:

Whether you’re an individual investor or a multibillion-dollar institution, we’re putting our knowledge and experience to work for you every day.

For more information about AB’s comprehensive range of products and shareholder resources, please log on to www.abfunds.com.

Thank you for your investment in AB mutual funds—and for placing your trust in our firm.

Sincerely,

Onur Erzan

President and Chief Executive Officer, AB Mutual Funds

SEMI-ANNUAL REPORT

June 27, 2024

This report provides management’s discussion of fund performance for the AllianceBernstein National Municipal Income Fund, Inc., for the semi-annual reporting period ended April 30, 2024. The Fund is a closed-end fund, and its shares are listed and traded on the New York Stock Exchange.

The Fund seeks to provide high current income exempt from regular federal income tax by investing substantially all of its net assets in municipal securities that pay interest that is exempt from federal income tax.

RETURNS AS OF APRIL 30, 2024 (unaudited)

The Fund’s market price per share on April 30, 2024, was $10.49. The Fund’s NAV price per share on April 30, 2024, was $12.20. For additional Financial Highlights, please see pages 45-46.

INVESTMENT RESULTS

The table above shows the Fund’s performance compared with its benchmark, the Bloomberg Municipal Bond Index, for the six- and 12-month periods ended April 30, 2024.

For the six-month period, the Fund outperformed the benchmark. Sector allocation, security selection, yield-curve positioning and the Fund’s duration overweight contributed to performance, relative to the benchmark. Relative overweights in state general obligation and not-for-profit health care were the two largest sector contributors, while an overweight to guaranteed bonds detracted.

For the 12-month period, the Fund outperformed the benchmark. Sector allocation, security selection and yield-curve positioning contributed to performance, while the Fund’s duration overweight detracted from performance. Relative overweights in charter schools and not-for-profit health care were the two largest sector contributors, while an overweight to prerefunded bonds detracted.

Leverage, achieved through the usage of tender option bond (“TOB”) and variable-rate municipal term preferred shares, added to total return over the six-month period, and detracted over the 12-month period as bond yields rose.

The Fund did not use derivatives during either period.

MARKET REVIEW AND INVESTMENT STRATEGY

For the six-month period ended April 30, 2024, the yield on a 10-Year 5% coupon AAA municipal bond fell to 2.81% from 3.61% and the yield on the 10-Year US Treasury fell to 4.69% from 4.92%. After-tax spreads tightened materially across the curve indicating municipals became expensive relative to Treasuries. Performance was particularly strong for the first two months of this period however worries about a reacceleration of inflation during the subsequent 4 months of the reporting period dampened the overall return.

The Fund’s Senior Investment Management Team (the “Team”) continues to focus on real after-tax return by investing in municipal bonds that generate income exempt from federal income taxes. The Team relies on an investment process that combines quantitative and fundamental research to build effective bond portfolios.

The Fund may purchase municipal securities that are insured under policies issued by certain insurance companies. Historically, insured municipal securities typically received a higher credit rating, which meant that the issuer of the securities paid a lower interest rate. As a result of declines in the credit quality and associated downgrades of most bond insurers, insurance has less value than it did in the past. The market now values insured municipal securities primarily based on the credit quality of the issuer of the security, with little value given to the insurance feature. In purchasing such insured securities, the Adviser evaluates the risk and return of municipal securities through its own research. If an insurance company’s rating is downgraded or the company becomes insolvent, the prices of municipal securities insured by the insurance company may decline. As of April 30, 2024, the Fund’s percentages of investments in municipal bonds that are insured and in insured municipal bonds that have been pre-refunded or escrowed to maturity were 12.16% and 0.00%, respectively.

INVESTMENT POLICIES

The Fund will normally invest at least 80%, and normally substantially all, of its net assets in municipal securities paying interest that is exempt from regular federal income tax. The Fund also normally will invest at least 75% of its assets in investment-grade municipal securities or unrated municipal securities considered to be of comparable quality. The Fund may invest up to 25% of its net assets in municipal bonds rated below investment-grade and unrated municipal bonds considered to be of comparable quality as determined by the Adviser. The Fund intends to invest primarily in municipal securities that pay interest that is not subject to the federal alternative minimum tax (“AMT”), but may invest without limit in municipal securities paying interest that is subject to the federal AMT. For more information regarding the Fund’s risks, please see “Disclosures and Risks” on pages 4-9 and “Note G—Risks Involved in Investing in the Fund” of the Notes to Financial Statements on pages 39-44.

DISCLOSURES AND RISKS

AllianceBernstein National Municipal Income Fund

Shareholder Information

Weekly comparative net asset value (“NAV”) and market price information about the Fund is published each Saturday in Barron’s and in other newspapers in a table called “Closed-End Funds.” Daily NAVs and market price information, and additional information regarding the Fund, is available at www.abfunds.com and www.nyse.com. For additional shareholder information regarding this Fund, please see pages 47-48.

Benchmark Disclosure

The Bloomberg Municipal Bond Index is unmanaged and does not reflect fees and expenses associated with the active management of a mutual fund portfolio. The Bloomberg Municipal Bond Index represents the performance of the long-term tax-exempt bond market consisting of investment-grade bonds. In addition, the Index does not reflect the use of leverage, whereas the Fund utilizes leverage. An investor cannot invest directly in an index, and its results are not indicative of the performance for any specific investment, including the Fund.

A Word About Risk

Among the risks of investing in the Fund are changes in the general level of interest rates or changes in bond credit quality ratings. Changes in interest rates have a greater effect on bonds with longer maturities than on those with shorter maturities. Please note, as interest rates rise, existing bond prices fall and can cause the value of your investment in the Fund to decline. While the Fund invests principally in bonds and other fixed-income securities, in order to achieve its investment objectives, the Fund may at times use certain types of investment derivatives, such as options, futures, forwards and swaps. These instruments involve risks different from, and in certain cases, greater than, the risks presented by more traditional investments. At the discretion of the Fund’s Adviser, the Fund may invest up to 25% of its net assets in municipal bonds that are rated below investment-grade (i.e., “junk bonds”). These securities involve greater volatility and risk than higher-quality fixed-income securities.

Financing and Related Transactions; Leverage and Other Risks: The Fund utilizes leverage to seek to enhance the yield and NAV attributable to its common stock. These objectives may not be achieved in all interest-rate environments. Leverage creates certain risks for holders of common stock, including the likelihood of greater volatility of the NAV and market price of the common stock. If income from the securities purchased from the funds made available by leverage is not sufficient to cover the cost of leverage, the Fund’s return will be less than if leverage had not been used.

DISCLOSURES AND RISKS (continued)

As a result, the amounts available for distribution to common stockholders as dividends and other distributions will be reduced. During periods of rising short-term interest rates, the interest paid on the preferred shares or floaters in TOB transactions would increase, which may adversely affect the Fund’s income and distribution to common stockholders. A decline in distributions would adversely affect the Fund’s yield and possibly the market value of its shares. If rising short-term rates coincide with a period of rising long-term rates, the value of the long-term municipal bonds purchased with the proceeds of leverage would decline, adversely affecting the NAV attributable to the Fund’s common stock and possibly the market value of the shares.

The Fund’s outstanding Variable Rate MuniFund Term Preferred Shares result in leverage. The Fund may also use other types of financial leverage, including TOB transactions, either in combination with, or in lieu of, the preferred shares. In a TOB transaction, the Fund may transfer a highly rated fixed-rate municipal security into a special purpose entity (typically, a trust). The Fund receives cash and a residual interest security (sometimes referred to as an “inverse floater”) issued by the trust in return. The trust simultaneously issues securities, which pay an interest rate that is reset each week based on an index of high-grade short-term [seven-day] demand notes. These securities, sometimes referred to as “floaters”, are bought by third parties, including tax-exempt money market funds, and can be tendered by these holders to a liquidity provider at par, unless certain events occur. The Fund continues to earn all the interest from the transferred bond less the amount of interest paid on the floaters and the expenses of the trust, which include payments to the trustee and the liquidity provider and organizational costs. The Fund also uses the cash received from the transaction for investment purposes or to retire other forms of leverage. Under certain circumstances, the trust may be terminated and collapsed, either by the Fund or upon the occurrence of certain events, such as a downgrade in the credit quality of the underlying bond, or in the event holders of the floaters tender their securities to the liquidity provider. See Note H to the financial statements for more information about TOB transactions.

The use of derivative instruments by the Fund, such as forwards, futures, options and swaps, may also result in a form of leverage.

Because the advisory fees received by the Adviser are based on the total net assets of the Fund (including assets supported by the proceeds of the Fund’s outstanding preferred shares), the Adviser has a financial incentive for the Fund to keep its preferred shares outstanding, which may create a conflict of interest between the Adviser and the common shareholders of the Fund.

DISCLOSURES AND RISKS (continued)

Tax Risk: There is no guarantee that the income on the Fund’s municipal securities will be exempt from regular federal income and state income taxes. Unfavorable legislation, adverse interpretations by federal or state authorities, litigation or noncompliant conduct by the issuer of a municipal security could affect the tax-exempt status of municipal securities. If the Internal Revenue Service or a state authority determines that an issuer of a municipal security has not complied with applicable requirements, interest from the security could become subject to regular federal income tax and/or state personal income tax, possibly retroactively to the date the security was issued, the value of the security could decline significantly, and a portion of the distributions to Fund shareholders could be recharacterized as taxable. Recent federal legislation included reductions in tax rates for individuals, with relatively larger reductions in tax rates for corporations. These tax rate reductions may reduce the demand for municipal bonds which could reduce the value of municipal bonds held by the Fund.

Market Risk: The market value of a security may move up or down, sometimes rapidly and unpredictably. These fluctuations may cause a security to be worth less than the price originally paid for it, or less than it was worth at an earlier time. Market risk may affect a single issuer, industry, sector of the economy or the market as a whole. Global economies and financial markets are increasingly interconnected, which increases the probabilities that conditions in one country or region might adversely impact issuers in a different country or region. Conditions affecting the general economy, including political, social, or economic instability at the local, regional, or global level may also affect the market value of a security. Health crises, such as pandemic and epidemic diseases, as well as other incidents that interrupt the expected course of events, such as natural disasters, including fires, earthquakes and flooding, war or civil disturbance, acts of terrorism, power outages and other unforeseeable and external events, and the public response to or fear of such diseases or events, have had, and may in the future have, an adverse effect on the Fund’s investments and NAV and can lead to increased market volatility. For example, the diseases or events themselves or any preventative or protective actions that governments may take in respect of such diseases or events may result in periods of business disruption, inability to obtain raw materials, supplies and component parts, and reduced or disrupted operations for issuers of securities held by the Fund. The occurrence and pendency of such diseases or events could adversely affect the economies and financial markets either in specific countries or worldwide.

Municipal Market Risk: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Fund’s investments in municipal securities. These factors include economic conditions, political or legislative changes, public

DISCLOSURES AND RISKS (continued)

health crises, uncertainties related to the tax status of municipal securities, and the rights of investors in these securities. To the extent that the Fund invests more of its assets in a particular state’s municipal securities, the Fund may be vulnerable to events adversely affecting that state, including economic, political and regulatory occurrences, court decisions, terrorism, public health crises (including the occurrence of a contagious disease or illness) and catastrophic natural disasters, such as hurricanes, fires or earthquakes. The Fund’s investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project’s ability to make payments of principal and interest on these securities.

Credit Risk: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security and accrued interest. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

Interest-Rate Risk: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of existing investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest-rate risk is generally greater for fixed-income securities with longer maturities or durations. The Fund may be subject to a greater risk of rising interest rates than would normally be the case due to the recent end of a period of historically low rates and the effect of potential central bank monetary policy, and government fiscal policy, initiatives and resulting market reactions to those initiatives.

Inflation Risk: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.

Derivatives Risk: The Fund may enter into derivative transactions such as forwards, options, futures and swaps. Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Fund. A short position in a derivative instrument

DISCLOSURES AND RISKS (continued)

involves the risk of a theoretically unlimited increase in the value of the underlying asset, which could cause the Fund to suffer a potentially unlimited loss. Derivatives, especially over-the-counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. Derivatives may result in significant losses, including losses that are far greater than the value of the derivatives reflected on the statement of assets and liabilities.

Illiquid Investments Risk: Illiquid investments risk exists when particular investments are or become difficult to purchase or sell, possibly preventing the Fund from selling out of these securities at an advantageous price. Causes of illiquid investments risk may include low trading volumes, large positions and heavy redemptions of Fund shares. Illiquid investments risk may be magnified in a rising interest-rate environment, when the value and liquidity of fixed-income securities generally decline. Derivatives and securities involving substantial market and credit risk tend to involve greater illiquid investments risk than most other types of investments. The Fund is subject to illiquid investments risk because the market for municipal securities is generally smaller than many other markets, which may make municipal securities more difficult to trade than other types of securities. Illiquid securities may also be difficult to value.

Duration Risk: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to the full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise.

Management Risk: The Fund is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected.

These risks are fully discussed in the Fund’s prospectus. As with all investments, you may lose money by investing in the Fund.

An Important Note About Historical Performance

The performance shown in this report represents past performance and does not guarantee future results. Current performance may be lower or higher than the performance information shown. All fees and expenses related to the operation of the Fund have been

DISCLOSURES AND RISKS (continued)

deducted. Performance assumes reinvestment of distributions and does not account for taxes. Historical performance does not reflect the deduction of taxes that a shareholder would pay on fund distributions or the sale of fund shares and assumes the reinvestment of dividends and capital gains distributions at prices obtained pursuant to the Fund’s dividend reinvestment plan.

HISTORICAL PERFORMANCE

AVERAGE ANNUAL RETURNS AS OF APRIL 30, 2024 (unaudited)

AVERAGE ANNUAL RETURNS

AS OF THE MOST RECENT CALENDAR QUARTER-END

MARCH 31, 2024 (unaudited)

Performance assumes the reinvestment of dividends and capital gains distributions at prices obtained pursuant to the Fund’s dividend reinvestment plan.

PORTFOLIO SUMMARY

April 30, 2024 (unaudited)

PORTFOLIO STATISTICS

Net Assets ($mil): $350.6

PORTFOLIO OF INVESTMENTS

April 30, 2024 (unaudited)

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As of April 30, 2024, the Fund’s percentages of investments in municipal bonds that are insured and in insured municipal bonds that have been pre-refunded or escrowed to maturity are 12.2% and 0.0%, respectively.

Glossary:

AGM – Assured Guaranty Municipal

BAM – Build American Mutual

CMBS – Commercial Mortgage-Backed Securities

OSF – Order of St. Francis

See notes to financial statements.

STATEMENT OF ASSETS & LIABILITIES

April 30, 2024 (unaudited)

See notes to financial statements.

STATEMENT OF OPERATIONS

Six Months Ended April 30, 2024 (unaudited)

See notes to financial statements.

STATEMENT OF CHANGES IN NET ASSETS

APPLICABLE TO COMMON SHAREHOLDERS

See notes to financial statements.

STATEMENT OF CASH FLOWS

For the six months ended April 30, 2024 (unaudited)

In accordance with U.S. GAAP, the Fund has included a Statement of Cash Flows as a result of its substantial investments in Variable Rate MuniFund Term Preferred Shares throughout the period.

See notes to financial statements.

NOTES TO FINANCIAL STATEMENTS

April 30, 2024 (unaudited)

NOTE A

Significant Accounting Policies

AllianceBernstein National Municipal Income Fund, Inc. (the “Fund”) is organized as a Maryland corporation and is registered under the Investment Company Act of 1940 (the “1940 Act”) as a diversified, closed-end management investment company. The financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”), which require management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities in the financial statements and amounts of income and expenses during the reporting period. Actual results could differ from those estimates. The Fund is an investment company under U.S. GAAP and follows the accounting and reporting guidance applicable to investment companies. The following is a summary of significant accounting policies followed by the Fund.

1. Security Valuation

Portfolio securities are valued at market value determined on the basis of market quotations or, if market quotations are not readily available or are unreliable, at “fair value” as determined in accordance with procedures approved by and under the oversight of the Fund’s Board of Directors (the “Board”). Pursuant to these procedures, AllianceBernstein L.P. (the “Adviser”) serves as the Fund’s valuation designee pursuant to Rule 2a-5 of the 1940 Act. In this capacity, the Adviser is responsible, among other things, for making all fair value determinations relating to the Fund’s portfolio investments, subject to the Board’s oversight.

In general, the market values of securities which are readily available and deemed reliable are determined as follows: securities listed on a national securities exchange (other than securities listed on the NASDAQ Stock Market, Inc. (“NASDAQ”)) or on a foreign securities exchange are valued at the last sale price at the close of the exchange or foreign securities exchange. If there has been no sale on such day, the securities are valued at the last traded price from the previous day. Securities listed on more than one exchange are valued by reference to the principal exchange on which the securities are traded; securities listed only on NASDAQ are valued in accordance with the NASDAQ Official Closing Price; listed or over the counter (“OTC”) market put or call options are valued at the mid level between the current bid and ask prices. If either a current bid or current ask price is unavailable, the Adviser will have discretion to determine the best valuation (e.g., last trade price in the case of listed options); open futures are valued using the closing settlement price or, in the absence of such a price, the most recent quoted bid price. If there are no quotations available for the day of valuation, the last available closing settlement price is used; U.S. Government securities and any other debt instruments having 60 days

NOTES TO FINANCIAL STATEMENTS (continued)

or less remaining until maturity are generally valued at market by an independent pricing vendor, if a market price is available. If a market price is not available, the securities are valued at amortized cost. This methodology is commonly used for short term securities that have an original maturity of 60 days or less, as well as short term securities that had an original term to maturity that exceeded 60 days. In instances when amortized cost is utilized, the Valuation Committee (the “Committee”) must reasonably conclude that the utilization of amortized cost is approximately the same as the fair value of the security. Factors the Committee will consider include, but are not limited to, an impairment of the creditworthiness of the issuer or material changes in interest rates. Fixed-income securities, including mortgage-backed and asset-backed securities, may be valued on the basis of prices provided by a pricing service or at a price obtained from one or more of the major broker-dealers. In cases where broker-dealer quotes are obtained, the Adviser may establish procedures whereby changes in market yields or spreads are used to adjust, on a daily basis, a recently obtained quoted price on a security. Swaps and other derivatives are valued daily, primarily using independent pricing services, independent pricing models using market inputs, as well as third party broker-dealers or counterparties. Open-end mutual funds are valued at the closing net asset value per share, while exchange traded funds are valued at the closing market price per share.

Securities for which market quotations are not readily available (including restricted securities) or are deemed unreliable are valued at fair value as deemed appropriate by the Adviser. Factors considered in making this determination may include, but are not limited to, information obtained by contacting the issuer, analysts, analysis of the issuer’s financial statements or other available documents. In addition, the Fund may use fair value pricing for securities primarily traded in non-U.S. markets because most foreign markets close well before the Fund values its securities at 4:00 p.m., Eastern Time. The earlier close of these foreign markets gives rise to the possibility that significant events, including broad market moves, may have occurred in the interim and may materially affect the value of those securities. To account for this, the Fund generally values many of its foreign equity securities using fair value prices based on third party vendor modeling tools to the extent available.

2. Fair Value Measurements

In accordance with U.S. GAAP regarding fair value measurements, fair value is defined as the price that the Fund would receive to sell an asset or pay to transfer a liability in an orderly transaction between market participants at the measurement date. U.S. GAAP establishes a framework for measuring fair value, and a three-level hierarchy for fair value measurements based upon the transparency of inputs to the valuation of an asset

NOTES TO FINANCIAL STATEMENTS (continued)

or liability (including those valued based on their market values as described in Note A.1 above). Inputs may be observable or unobservable and refer broadly to the assumptions that market participants would use in pricing the asset or liability. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Fund. Unobservable inputs reflect the Fund’s own assumptions about the assumptions that market participants would use in pricing the asset or liability based on the best information available in the circumstances. Each investment is assigned a level based upon the observability of the inputs which are significant to the overall valuation. The three-tier hierarchy of inputs is summarized below.

The fair value of debt instruments, such as bonds, and over-the-counter derivatives is generally based on market price quotations, recently executed market transactions (where observable) or industry recognized modeling techniques and are generally classified as Level 2. Pricing vendor inputs to Level 2 valuations may include quoted prices for similar investments in active markets, interest rate curves, coupon rates, currency rates, yield curves, option adjusted spreads, default rates, credit spreads and other unique security features in order to estimate the relevant cash flows which are then discounted to calculate fair values. If these inputs are unobservable and significant to the fair value, these investments will be classified as Level 3.

Other fixed income investments, including non-U.S. government and corporate debt, are generally valued using quoted market prices, if available, which are typically impacted by current interest rates, maturity dates and any perceived credit risk of the issuer. Additionally, in the absence of quoted market prices, these inputs are used by pricing vendors to derive a valuation based upon industry or proprietary models which incorporate issuer specific data with relevant yield/spread comparisons with more widely quoted bonds with similar key characteristics. Those investments for which there are observable inputs are classified as Level 2. Where the inputs are not observable, the investments are classified as Level 3.

NOTES TO FINANCIAL STATEMENTS (continued)

The following table summarizes the valuation of the Fund’s investments by the above fair value hierarchy levels as of April 30, 2024:

3. Taxes

It is the Fund’s policy to meet the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all of its investment company taxable income and net realized gains, if any, to shareholders. Therefore, no provisions for federal income or excise taxes are required.

In accordance with U.S. GAAP requirements regarding accounting for uncertainties in income taxes, management has analyzed the Fund’s tax positions taken or expected to be taken on federal and state income tax returns for all open tax years (the current and the prior three tax years) and has concluded that no provision for income tax is required in the Fund’s financial statements.

4. Investment Income and Investment Transactions

Dividend income is recorded on the ex-dividend date or as soon as the Fund is informed of the dividend. Interest income is accrued daily. Investment transactions are accounted for on the date the securities are purchased or sold. Investment gains or losses are determined on the identified cost basis. Non-cash dividends, if any, are recorded on the ex-dividend date at the fair value of the securities received. The Fund amortizes premiums and accretes original issue and market discounts as adjustments to interest income. The Fund accounts for distributions

NOTES TO FINANCIAL STATEMENTS (continued)

received from real estate investment trust (“REIT”) investments or from regulated investment companies as dividend income, realized gain, or return of capital based on information provided by the REIT or the investment company.

5. Dividends and Distributions

Dividends and distributions to shareholders, if any, are recorded on the ex-dividend date. Income dividends and capital gains distributions are determined in accordance with federal tax regulations and may differ from those determined in accordance with U.S. GAAP. To the extent these differences are permanent, such amounts are reclassified within the capital accounts based on their federal tax basis treatment; temporary differences do not require such reclassification.

6. Cash and Short-Term Investments

Cash and short-term investments include cash on hand and short-term investments with maturities of less than one year when purchased.

NOTE B

Advisory Fee and Other Transactions with Affiliates

Under the terms of an investment advisory agreement, the Fund pays the Adviser an advisory fee at the annual rate of .55% of the Fund’s adjusted average daily net assets. Such advisory fee, which is calculated on the basis of the assets attributable to the Fund’s common and preferred shareholders, is accrued daily and paid monthly. In computing daily net assets for purposes of determining the advisory fee payable, the Fund calculates daily the value of the total assets of the Fund, minus the value of the total liabilities of the Fund, except that the aggregate liquidation preference of Variable Rate MuniFund Term Preferred Shares (the“VMTPS”), which is a liability for financial reporting purposes, is not deducted.

Under the terms of the shareholder inquiry agency agreement with Alliance-Bernstein Investor Services, Inc. (“ABIS”), a wholly-owned subsidiary of the Adviser, the Fund reimburses ABIS for costs relating to servicing phone inquiries on behalf of the Fund. During the six months ended April 30, 2024, there was no reimbursement paid to ABIS.

The Fund may invest in AB Government Money Market Portfolio (the “Government Money Market Portfolio”) which has a contractual annual advisory fee rate of .20% of the portfolio’s average daily net assets and bears its own expenses. The Adviser had contractually agreed to waive .10% of the advisory fee of Government Money Market Portfolio (resulting in a net advisory fee of .10%) until August 31, 2023. Effective September 1, 2023, the Adviser has contractually agreed to waive .05% of the advisory fee of Government Money Market Portfolio (resulting in a net

NOTES TO FINANCIAL STATEMENTS (continued)

advisory fee of .15%) until August 31, 2024. In connection with the investment by the Fund in Government Money Market Portfolio, the Adviser has contractually agreed to waive its advisory fee from the Fund in an amount equal to the Fund’s pro rata share of the effective advisory fee of Government Money Market Portfolio, as borne indirectly by the Fund as an acquired fund fee and expense. For the six months ended April 30, 2024, such waiver amounted to $4,529.

A summary of the Fund’s transactions in AB mutual funds for the six months ended April 30, 2024 is as follows:

NOTE C

Investment Transactions

Purchases and sales of investment securities (excluding short-term investments) for the six months ended April 30, 2024 were as follows:

The cost of investments for federal income tax purposes was substantially the same as the cost for financial reporting purposes. Accordingly, gross unrealized appreciation and unrealized depreciation are as follows:

1. Derivative Financial Instruments

The Fund may use derivatives in an effort to earn income and enhance returns, to replace more traditional direct investments, to obtain exposure to otherwise inaccessible markets (collectively, “investment purposes”), or to hedge or adjust the risk profile of its portfolio.

The Fund did not engage in derivatives transactions for the six months ended April 30, 2024.

NOTES TO FINANCIAL STATEMENTS (continued)

NOTE D

Common Stock

There are 28,744,936 shares of common stock outstanding at April 30, 2024. During the six months ended April 30, 2024 and the year ended October 31, 2023, the Fund did not issue any shares in connection with the Fund’s dividend reinvestment plan.

NOTE E

Variable Rate MuniFund Term Preferred Shares

During the year ended October 31, 2019, the Fund completed private offerings of 2019 VMTPS and 2018 VMTPS, each having a liquidation preference of $25,000 per share, on August 28, 2019 and December 19, 2018, respectively. The Fund issued and sold 5,754 2019 VMTPS and 3,531 2018 VMTPS in its offerings. The 2019 VMTPS and 2018 VMTPS rank pari passu with each other but are subject to a mandatory redemption by the Fund in August 2049 and December 2048, respectively.

The VMTPS generally do not trade, and market quotations are generally not available. The VMTPS paid a variable dividend rate tied to a SIFMA Municipal Swap index, plus an additional fixed “spread” amount of 0.90% for 2018 VMTPS and 0.98% for 2019 VMTPS, as established at the time of issuance. Effective April 22, 2021, the spread was 1.05% for the 2018 VMTPS. Effective September 14, 2023, the base rate is 80% of the Secured Overnight Financing Rate (“SOFR”) plus a spread of .55% for the 2018 VMTPS. Effective December 9, 2021, the spread is 0.91% for the 2019 VMTPS. As of April 30, 2024, the dividend rates for the 2018 VMTPS and 2019 VMTPS were 4.81% and 4.68%, respectively. In the Fund’s statement of assets and liabilities, the aggregate liquidation preference of the VMTPS is shown as a liability in accordance with U.S. GAAP because the VMTPS have a stated mandatory redemption date. For the six months ended April 30, 2024, the average amount of the VMTPS outstanding and the daily weighted average dividend rate were $232,125,000 and 4.59%, respectively.

Dividends on the VMTPS (which are treated as interest payments for financial reporting purposes) are accrued daily and paid monthly. Unpaid dividends on the VMTPS are recorded as “Interest expense payable” on the statement of assets and liabilities. Dividends accrued on the VMTPS are recorded as a component of “Interest expense, fees and amortization of offering costs” on the statement of operations.

Costs incurred by the Fund in connection with its offering of the VMTPS were recorded as a deferred charge, and are amortized over the first three years of the life of the shares and the amortization is included within “Interest expense, fees and amortization of offering costs” on the statement

NOTES TO FINANCIAL STATEMENTS (continued)

of operations. The debt issuance costs related to the liability represented by the VMTPS under U.S. GAAP are presented as a direct deduction from the liability rather than as an asset on the statement of assets and liabilities, consistent with debt discounts. The Fund included deferred offering costs in “Variable Rate MuniFund Term Preferred Shares, at liquidation value (net of unamortized deferred offering cost)” on the statement of assets and liabilities. The VMTPS are treated as equity for tax purposes. During the six months ended April 30, 2024, no additional costs were incurred and capitalized by the Fund.

The preferred shareholders, i.e., the holders of both the 2019 VMTPS and 2018 VMTPS, voting together as a separate class, have the right to elect at least two directors at all times and to elect a majority of the directors in the event two years’ dividends on the preferred shares are unpaid. In each case, the remaining directors will be elected by the common shareholders and preferred shareholders voting together as a single class. The preferred shareholders vote as a separate class on certain other matters as required under the Fund’s Charter, the Investment Company Act of 1940 and Maryland law.

NOTE F

Distributions to Common Shareholders

The tax character of distributions to be paid for the year ending October 31, 2024 will be determined at the end of the current fiscal year. The tax character of distributions paid during the fiscal years ended October 31, 2023 and October 31, 2022 were as follows:

As of October 31, 2023, the components of accumulated earnings (deficit) on a tax basis were as follows:

NOTES TO FINANCIAL STATEMENTS (continued)

For tax purposes, net realized capital losses may be carried over to offset future capital gains, if any. Funds are permitted to carry forward capital losses for an indefinite period, and such losses will retain their character as either short-term or long-term capital losses. As of October 31, 2023, the Fund had a net short-term capital loss carryforward of $11,029,205 and a net long-term capital loss carryforward of $26,786,098 which may be carried forward for an indefinite period.

NOTE G

Risks Involved in Investing in the Fund

Among the risks of investing in the Fund are changes in the general level of interest rates or changes in bond credit quality ratings. Changes in interest rates have a greater effect on bonds with longer maturities than on those with shorter maturities. Please note, as interest rates rise, existing bond prices fall and can cause the value of your investment in the Fund to decline. While the Fund invests principally in bonds and other fixed-income securities, in order to achieve its investment objectives, the Fund may at times use certain types of investment derivatives, such as options, futures, forwards and swaps. These instruments involve risks different from, and in certain cases, greater than, the risks presented by more traditional investments. At the discretion of the Fund’s Adviser, the Fund may invest up to 25% of its net assets in municipal bonds that are rated below investment-grade (i.e., “junk bonds”). These securities involve greater volatility and risk than higher-quality fixed-income securities.

Market Risk—The market value of a security may move up or down, sometimes rapidly and unpredictably. These fluctuations may cause a security to be worth less than the price originally paid for it, or less than it was worth at an earlier time. Market risk may affect a single issuer, industry, sector of the economy or the market as a whole. Global economies and financial markets are increasingly interconnected, which increases the probabilities that conditions in one country or region might adversely impact issuers in a different country or region. Conditions affecting the general economy, including political, social, or economic instability at the local, regional, or global level may also affect the market value of a security. Health crises, such as pandemic and epidemic diseases, as well as other incidents that interrupt the expected course of events, such as natural disasters, including fires, earthquakes and flooding, war or civil disturbance, acts of terrorism, power outages and other unforeseeable and external events, and the public response to or fear of such diseases or events, have had, and may in the future have, an adverse effect on the Fund’s investments and net asset value and can lead to increased market volatility. For example, the diseases or events themselves or any preventative or protective actions that governments may take in respect of such diseases or events may result in periods of business disruption,