MUNIHOLDINGS INSURED FUND INC/NJ
N-2/A, 1998-04-28
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<PAGE>
 
     
  AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 28, 1998     
                                            
                                         SECURITIES ACT FILE NO. 333-48289     
                                    
                                 INVESTMENT COMPANY ACT FILE NO. 811-08707     
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- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                                --------------
                                   FORM N-2
 [X]        REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                      
 [X]                  PRE-EFFECTIVE AMENDMENT NO. 1     
 [_]                     POST-EFFECTIVE AMENDMENT NO.
                                    AND/OR
 [X]    REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

                             AMENDMENT NO. 1     
 [X]                   (CHECK APPROPRIATE BOX OR BOXES)
 
                                --------------
                        MUNIHOLDINGS INSURED FUND, INC.
              (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
                                --------------
 
                            800 SCUDDERS MILL ROAD
                         PLAINSBORO, NEW JERSEY 08536
                   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
 
                                --------------
 
                                (609) 282-2800
             (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)
 
                                --------------
 
                                 ARTHUR ZEIKEL
                        MUNIHOLDINGS INSURED FUND, INC.
             800 SCUDDERS MILL ROAD, PLAINSBORO, NEW JERSEY 08536
       MAILING ADDRESS: P.O. BOX 9011, PRINCETON, NEW JERSEY 08543-9011
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
 
                                --------------
 
                                  COPIES TO:
  PATRICK D. SWEENEY, ESQ. FUND ASSET   FRANK P. BRUNO, ESQ. BROWN & WOOD LLP
    MANAGEMENT, L.P. P.O. BOX 9011      ONE WORLD TRADE CENTER NEW YORK, NEW
   PRINCETON, NEW JERSEY 08543-9011                YORK 10048-0557
 
                                --------------
 
  APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: As soon as practicable after
the effective date of this Registration Statement.
 
                                --------------
 
  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended (the "Securities Act"), other than securities offered only in
connection with dividend or interest reinvestment plans, check the following
box. [_]
 
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]______________
 
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the
same offering. [_]_______________
 
  If delivery of the prospectus is expected to be made pursuant to Rule 434
under the Securities Act, please check the following box. [_]
 
                                --------------
 
       CALCULATION OF REGISTRATION FEE UNDER THE SECURITIES ACT OF 1933
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<TABLE>   
<CAPTION>
                                             PROPOSED       PROPOSED
       TITLE OF              AMOUNT          MAXIMUM        MAXIMUM      AMOUNT OF
   SECURITIES BEING           BEING       OFFERING PRICE   AGGREGATE    REGISTRATION
      REGISTERED          REGISTERED(1)      PER UNIT    OFFERING PRICE    FEE(2)
- ------------------------------------------------------------------------------------
<S>                     <C>               <C>            <C>            <C>
Common Stock ($.10 par
 value)                 13,800,000 shares     $15.00      $207,000,000    $61,065
</TABLE>    
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                                --------------
   
(1) Includes 1,800,000 shares subject to the Underwriter's over-allotment
    option.     
(2) Estimated solely for the purpose of calculating the registration fee.
   
(3) Transmitted to the designated lockbox at Mellon Bank in Pittsburgh, PA.
    $34,095 was previously paid. $26,970 was transmitted in connection with this
    filing.     
 
- -------------------------------------------------------------------------------
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<PAGE>
 
                        MUNIHOLDINGS INSURED FUND, INC.
 
                             CROSS REFERENCE SHEET
 
<TABLE>
<CAPTION>
 ITEM NUMBER, FORM N-2                             CAPTION IN PROSPECTUS
 ---------------------                             ---------------------
PART A--INFORMATION REQUIRED IN A PROSPECTUS
 <C>                                              <S>
  1. Outside Front Cover Page....................  Outside Front Cover Page
  2. Inside Front and Outside Back Cover Pages...  Inside Front and Outside Back Cover Pages; Underwriting
  3. Fee Table and Synopsis......................  Prospectus Summary; Fee Table
  4. Financial Highlights........................  Not Applicable
  5. Plan of Distribution........................  Prospectus Summary; Net Asset Value; Underwriting
  6. Selling Shareholders........................  Not Applicable
  7. Use of Proceeds.............................  Use of Proceeds; Investment Objective and Policies
  8. General Description of the Registrant.......  Prospectus Summary; The Fund; Investment Objective and Policies; Risks and
                                                   Special Considerations of Leverage; Investment Restrictions; Dividends and
                                                   Distributions; Automatic Dividend Reinvestment Plan; Mutual Fund Investment
                                                   Option
  9. Management..................................  Directors and Officers; Investment Advisory and Management Arrangements;
                                                   Custodian; Transfer Agent, Dividend Disbursing Agent and Registrar
 10. Capital Stock, Long-Term Debt, and Other Se-
  curities.....................................    Description of Capital Stock
 11. Defaults and Arrears on Senior Securities...  Not Applicable
 12. Legal Proceedings...........................  Not Applicable
 13. Table of Contents of the Statement of
      Additional Information.....................  Not Applicable
PART B--INFORMATION REQUIRED IN A STATEMENT OF ADDITIONAL INFORMATION
 14. Cover Page..................................  Not Applicable
 15. Table of Contents...........................  Not Applicable
 16. General Information and History.............  Not Applicable
 17. Investment Objective and Policies...........  Prospectus Summary; Investment Objective and Policies; Investment
                                                   Restrictions
 18. Management..................................  Directors and Officers; Investment Advisory and Management Arrangements
 19. Control Persons and Principal Holders of Se-
  curities.....................................    Investment Advisory and Management Arrangements
 20. Investment Advisory and Other Services......  Investment Advisory and Management Arrangements; Custodian; Underwriting;
                                                   Transfer Agent, Dividend Disbursing Agent and Registrar; Legal Opinions;
                                                   Experts
 21. Brokerage Allocation and Other Practices....  Portfolio Transactions
 22. Tax Status..................................  Taxes; Automatic Dividend Reinvestment Plan
 23. Financial Statements........................  Report of Independent Auditors; Statement of Assets, Liabilities and Capital
</TABLE>
 
PART C--OTHER INFORMATION
 
  Information required to be included in Part C is set forth under the
appropriate Item, so numbered, in Part C to this Registration Statement.
<PAGE>
 
       
       
PROSPECTUS
                               
                            12,000,000 SHARES     
 
                        MUNIHOLDINGS INSURED FUND, INC.
 
                                 COMMON STOCK
 
                               ----------------
 
  MuniHoldings Insured Fund, Inc. (the "Fund") is a newly organized, non-
diversified, closed-end management investment company that seeks to provide
shareholders with current income exempt from Federal income taxes. The Fund
seeks to achieve its investment objective by investing primarily in a
portfolio of long-term, investment grade municipal obligations the interest on
which, in the opinion of bond counsel to the issuer, is exempt from Federal
income taxes. The Fund intends to invest in municipal obligations that are
rated investment grade or, if unrated, are considered by Fund Asset
Management, L.P. (the "Investment Adviser") to be of comparable quality. Under
normal circumstances, at least 80% of the Fund's assets will be invested in
municipal obligations with remaining maturities of one year or more that are
covered by insurance guaranteeing the timely payment of principal at maturity
and interest. Investors are advised to read this Prospectus carefully and
retain it for future reference.
 
  Because the Fund is newly organized, its shares have no history of public
trading. Shares of closed-end investment companies frequently trade at a
discount from their net asset value. This risk may be greater for investors
expecting to sell their shares in a relatively short period after completion
of the public offering. See "Prospectus Summary--Risk Factors and Special
Considerations."
 
  Within approximately three months after completion of the offering of Common
Stock described herein, the Fund intends to offer shares of preferred stock
representing approximately 40% of the Fund's capital immediately after the
issuance of such preferred stock. There can be no assurance, however, that
preferred stock representing such percentage of the Fund's capital will
actually be issued. INVESTORS SHOULD NOTE THE SPECIAL RISKS ASSOCIATED WITH
THE LEVERAGING OF THE COMMON STOCK. SEE "RISKS AND SPECIAL CONSIDERATIONS OF
LEVERAGE" AND "DESCRIPTION OF CAPITAL STOCK."
                                                      (Continued on next page)
 
  THESE SECURITIES HAVE NOT  BEEN APPROVED OR  DISAPPROVED BY THE SECURITIES
    AND  EXCHANGE  COMMISSION  NOR  HAS  THE COMMISSION  PASSED  UPON  THE
      ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
        CONTRARY IS A CRIMINAL OFFENSE.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>   
<CAPTION>
                                              PRICE TO   SALES LOAD PROCEEDS TO
                                               PUBLIC      (1)(2)     FUND(3)
- --------------------------------------------------------------------------------
<S>                                         <C>          <C>        <C>
Per Share.................................     $15.00       None       $15.00
- --------------------------------------------------------------------------------
Total(4)..................................  $180,000,000    None    $180,000,000
</TABLE>    
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
   
(1) The Investment Adviser or an affiliate will pay the Underwriter a
    commission in the amount of 2.00% of the Price to Public per share in
    connection with the sale of shares of Common Stock offered hereby. See
    "Underwriting."     
(2) The Fund and the Investment Adviser have agreed to indemnify the
    Underwriter against certain liabilities under the Securities Act of 1933.
    See "Underwriting."
   
(3) Before deducting organizational and offering expenses payable by the Fund
    estimated at $363,000.     
   
(4) The Fund has granted the Underwriter an option to purchase up to an
    additional 1,800,000 shares to cover over-allotments. If all such shares
    are purchased, the total Price to Public and Proceeds to Fund will be
    $207,000,000. See "Underwriting."     
                               ----------------
   
  The shares are offered by the Underwriter, subject to prior sale, when, as
and if issued by the Fund and accepted by the Underwriter, subject to approval
of certain legal matters by counsel for the Underwriter and certain other
conditions. The Underwriter reserves the right to withdraw, cancel or modify
such offer and to reject orders in whole or in part. It is expected that
delivery of the shares will be made in New York, New York on or about May 1,
1998.     
 
                               ----------------
 
                              MERRILL LYNCH & CO.
 
                               ----------------
                 
              The date of this Prospectus is April 28, 1998.     
<PAGE>
 
(Continued from preceding page)
 
  The Fund may invest all or a portion of its assets in certain tax-exempt
securities classified as "private activity bonds" that may subject certain
investors in the Fund to an alternative minimum tax. At times, the Fund may
seek to hedge its portfolio through the use of options and futures
transactions. There can be no assurance that the investment objective of the
Fund will be realized. The Fund is designed primarily for long-term investors
and should not be considered a vehicle for trading purposes. The address of
the Fund is 800 Scudders Mill Road, Plainsboro, New Jersey 08536, and its
telephone number is (609) 282-2800.
   
  Prior to this offering, there has been no public market for the Common Stock
of the Fund. The Fund's shares of Common Stock have been approved for listing
on the New York Stock Exchange. However, during an initial period, which is
not expected to exceed two weeks from the date of this Prospectus, the Fund's
Common Stock will not be listed on any securities exchange. During such
period, the Underwriter does not intend to make a market in the Fund's Common
Stock. Consequently, it is anticipated that an investment in the Fund will be
illiquid during such period.     
 
  The issuance of the preferred stock will result in leveraging of the Common
Stock. Although the terms of the preferred stock offering will be determined
by the Fund's Board of Directors, it is anticipated that the preferred stock
will pay dividends that will be adjusted over either relatively short-term
periods (generally seven to 28 days) or medium-term periods (up to five years)
and that the dividend rate will be based upon prevailing interest rates for
debt obligations of comparable maturity. The proceeds of the preferred stock
offering will be invested in longer-term obligations in accordance with the
Fund's investment objective. Because under normal market conditions,
obligations with longer maturities produce higher yields than short-term and
medium-term obligations, the Investment Adviser believes that the spread
inherent in the difference between the short-term and medium-term rates paid
by the Fund and the longer-term rates received by the Fund will provide
holders of Common Stock with a potentially higher yield.
 
  The Underwriter may engage in transactions that stabilize, maintain, or
otherwise affect the price of the Fund's Common Stock. Such transactions may
include stabilizing, the purchase of the Fund's Common Stock to cover short
positions and the imposition of penalty bids. For a description of these
activities, see "Underwriting."
 
                                       2
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The following summary is qualified in its entirety by reference to the more
detailed information included elsewhere in this Prospectus.
 
THE FUND    MuniHoldings Insured Fund, Inc. (the "Fund") is a newly
            organized, non-diversified, closed-end management investment
            company. See "The Fund."
 
THE            
OFFERING    The Fund is offering 12,000,000 shares of Common Stock at an
            initial offering price of $15.00 per share. The Common Stock is
            being offered by Merrill Lynch, Pierce, Fenner & Smith
            Incorporated ("Merrill Lynch" or the "Underwriter"). The
            Underwriter has been granted an option, exercisable for 45 days
            from the date of this Prospectus, to purchase up to 1,800,000
            additional shares of Common Stock to cover over-allotments. See
            "Underwriting."     
 
INVESTMENT  The investment objective of the Fund is to provide shareholders
OBJECTIVE   with current income exempt from Federal income taxes. The Fund
AND         will seek to achieve its investment objective by investing
POLICIES    primarily in a portfolio of long-term, investment grade
            municipal obligations the interest on which, in the opinion of
            bond counsel to the issuer, is exempt from Federal income
            taxes. The Fund intends to invest in municipal obligations that
            are rated investment grade or, if unrated, are considered by
            the Investment Adviser to be of comparable quality. Under
            normal circumstances, at least 80% of the Fund's assets will be
            invested in municipal obligations with remaining maturities of
            one year or more that are covered by insurance guaranteeing the
            timely payment of principal at maturity and interest. See
            "Investment Objective and Policies."
 
LISTING        
            Prior to this offering, there has been no public market for the
            Common Stock of the Fund. The Fund's shares of Common Stock
            have been approved for listing on the New York Stock Exchange.
            However, during an initial period which is not expected to
            exceed two weeks from the date of this Prospectus, the Fund's
            shares of Common Stock will not be listed on any securities
            exchange. During such period, the Underwriter does not intend
            to make a market in the Fund's shares of Common Stock.
            Consequently, it is anticipated that an investment in the Fund
            will be illiquid during such period. See "Underwriting."     
 
LEVERAGE    The Fund anticipates that it will be substantially invested in
            longer-term municipal obligations within approximately three
            months after completion of the offering of Common Stock
            described herein. To leverage the Common Stock, the Fund
            intends to offer shares of preferred stock within three months
            after completion of this offering representing approximately
            40% of the Fund's capital immediately after the issuance of
            such preferred stock. There can be no assurance, however, that
            preferred stock representing such percentage of the Fund's
            capital will actually be issued. The issuance of the preferred
            stock will result in the leveraging of the Common Stock.
            Although the terms of the preferred stock offering will be
            determined by the Fund's Board of Directors, it is anticipated
            that the preferred stock will pay dividends that will be
            adjusted over either relatively short-term periods (generally
            seven to 28 days) or medium-
 
                                       3
<PAGE>
 
            term periods (up to five years) and that the dividend rate will
            be based upon prevailing interest rates for debt obligations of
            comparable maturity. The proceeds of the preferred stock
            offering will be invested in longer-term obligations in
            accordance with the Fund's investment objective. Issuance and
            ongoing expenses of the preferred stock will be borne by the
            Fund and will reduce the net asset value of the Common Stock.
            Additionally, under certain circumstances, when the Fund is
            required to allocate taxable income to holders of preferred
            stock, it is anticipated that the terms of the preferred stock
            will require the Fund to make an additional distribution to
            such holders in an amount approximately equal to the tax
            liability resulting from such allocation and such additional
            distribution (such amount, an "Additional Distribution").
 
            The use of leverage by the Fund creates an opportunity for
            increased net income, but, at the same time, creates special
            risks. Because, under normal market conditions, obligations
            with longer maturities produce higher yields than short-term
            and medium-term obligations, the Investment Adviser believes
            that the spread inherent in the difference between the short-
            term and medium-term rates (and any Additional Distribution)
            paid by the Fund and the longer-term rates received by the Fund
            will provide holders of Common Stock with a potentially higher
            yield. Investors should note, however, that leverage creates
            certain risks for holders of Common Stock, including higher
            volatility of both the net asset value and market value of the
            Common Stock. Since any decline in the value of the Fund's
            investments will be borne entirely by holders of Common Stock,
            the effect of leverage in a declining market would result in a
            greater decrease in net asset value than if the Fund were not
            leveraged, which would likely be reflected in a decline in the
            market price for shares of Common Stock. Additionally,
            fluctuations in the dividend rates on, and the amount of
            taxable income allocable to, the preferred stock will affect
            the yield to holders of Common Stock. See "Risks and Special
            Considerations of Leverage." Upon issuance of the preferred
            stock, holders of the Common Stock will receive all net income
            of the Fund remaining after payment of dividends (and any
            Additional Distribution) on the preferred stock and will
            generally be entitled to a pro rata share of net realized
            capital gains. Upon any liquidation of the Fund, the holders of
            shares of preferred stock will be entitled to receive
            liquidating distributions (expected to equal the original
            purchase price per share of preferred stock plus any
            accumulated and unpaid dividends thereon and any accumulated
            and unpaid Additional Distribution) before any distribution is
            made to holders of Common Stock. See "Description of Capital
            Stock--Preferred Stock."
 
            Holders of preferred stock, voting as a separate class, will be
            entitled to elect two of the Fund's Directors, and holders of
            common and preferred stock, voting together as a single class,
            will be entitled to elect the remaining Directors. If, at any
            time, dividends on the Fund's preferred stock were to be in
            arrears in an amount equal to two full years of dividend
            payments, the holders of all outstanding shares of preferred
            stock, voting as a separate class, would be entitled to elect a
            majority of the Fund's Directors. The holders of preferred
            stock will also vote separately on certain other matters as
            required under the Fund's Articles of Incorporation, the
            Investment Company Act of 1940, as amended (the "1940 Act") and
            Maryland law, but otherwise will have equal voting rights with
            holders of Common Stock (one vote per share) and will vote
            together with holders of Common Stock as a single class. See
            "Description of Capital Stock--Preferred Stock--Voting Rights."
 
                                       4
<PAGE>
 
 
            There can be no assurance that the Fund will be able to realize
            a higher net return on its investment portfolio than the then
            current dividend rate (and any Additional Distribution) on the
            preferred stock. Changes in certain factors could cause the
            relationship between the short-term and medium-term dividend
            rates (and any Additional Distribution) paid by the Fund on the
            preferred stock and the long-term rates received by the Fund on
            its investment portfolio to change so that such short-term and
            medium-term rates (and any Additional Distribution) may
            substantially increase relative to rates on the long-term
            obligations in which the Fund may be invested. Under such
            conditions, the benefit of leverage to holders of Common Stock
            will be reduced, and the Fund's leveraged capital structure
            could result in a lower rate of return to holders of Common
            Stock than if the Fund were not leveraged. The Fund will have
            the authority to redeem the preferred stock for any reason and
            may redeem all or part of the preferred stock if it anticipates
            that the Fund's leveraged capital structure will result in a
            lower rate of return to holders of the Common Stock than that
            obtainable if the Common Stock were unleveraged for any
            significant amount of time.
 
            Prior to the time it offers the preferred stock, the Fund
            intends to apply for ratings on such stock from one or more
            NRSROs. The Fund believes that obtaining a rating for the
            preferred stock will enhance the marketability of the preferred
            stock and thereby reduce the dividend rate on the preferred
            stock from that which the Fund would be required to pay if the
            preferred stock were not rated.
 
INVESTMENT     
ADVISER     Fund Asset Management, L.P. is the Fund's investment adviser
            and is responsible for the management of the Fund's investment
            portfolio and for providing administrative services to the
            Fund. For its services, the Fund pays the Investment Adviser a
            monthly fee at the annual rate of 0.55 of 1% of the Fund's
            average weekly net assets, including proceeds from the sale of
            preferred stock. The Investment Adviser is an affiliate of
            Merrill Lynch Asset Management, L.P. ("MLAM"), which is owned
            and controlled by Merrill Lynch & Co., Inc. ("ML & Co."). The
            Asset Management Group of ML & Co. (which includes the
            Investment Adviser) acts as the investment adviser for over 100
            registered management investment companies and offers portfolio
            management services to individual and institutional accounts.
            As of March 1998, the Asset Management Group had a total of
            approximately $488 billion in investment company and other
            portfolio assets under management (approximately $37 billion of
            which was invested in municipal securities). This amount
            includes assets managed for certain affiliates of the
            Investment Adviser. See "Investment Advisory and Management
            Arrangements."     
 
DIVIDENDS
AND
DISTRIBUTIONS
            The Fund intends to pay dividends monthly and to distribute
            substantially all of its net investment income to holders of
            Common Stock. From and after issuance of the preferred stock,
            monthly distributions to holders of Common Stock will consist
            of substantially all net investment income remaining after the
            payment of dividends (and any Additional Distribution) on the
            preferred stock. It is expected that the Fund will commence
            paying dividends to holders of Common Stock within
            approximately 90 days from the date of this Prospectus. Net
            capital gains (including new categories of capital gains,
            discussed under "Taxes"), if any, will be distributed at least
            annually to holders of Common Stock and, after issuance of the
            preferred
 
                                       5
<PAGE>
 
            stock, on a pro rata basis to holders of Common Stock and
            preferred stock. When capital gains or other taxable income is
            allocated to holders of preferred stock, under certain
            circumstances, it is anticipated that the terms of the
            preferred stock will require the Fund to make an Additional
            Distribution. The Fund is not permitted to declare any cash
            dividend or other distribution on its Common Stock unless asset
            coverage (as defined in the 1940 Act) with respect to the
            Fund's preferred stock is at least 200%. If the Fund issues
            preferred stock representing 40% of its capital after the time
            of issuance, its asset coverage with respect to the preferred
            stock will be approximately 250%. If the Fund's ability to make
            distributions on its Common Stock is limited, this could under
            certain circumstances impair the ability of the Fund to
            maintain its qualification for taxation as a regulated
            investment company, which would have adverse tax consequences
            for holders of Common Stock. See "Taxes."
 
AUTOMATIC   All dividend and capital gains distributions will be
DIVIDEND    automatically reinvested in additional shares of Common Stock
REINVESTMENTof the Fund unless a shareholder elects to receive cash.
PLAN        Shareholders whose shares are held in the name of a broker or
            nominee should contact such broker or nominee to confirm that
            they may participate in the Fund's dividend reinvestment plan.
            See "Automatic Dividend Reinvestment Plan."
 
MUTUAL      Purchasers of shares of Common Stock of the Fund through
FUND        Merrill Lynch in this offering will have an investment option
INVESTMENT  consisting of the right to reinvest the net proceeds from a
OPTION      sale of such shares (the "Original Shares") in Class D initial
            sales charge shares of certain Merrill Lynch-sponsored open-end
            mutual funds ("Eligible Class D Shares") at their net asset
            value, without the imposition of the initial sales charge, if
            the conditions set forth below are satisfied. First, the sale
            of the Original Shares must be made through Merrill Lynch, and
            the net proceeds therefrom must be immediately reinvested in
            Eligible Class D Shares. Second, the Original Shares must have
            been either acquired in this offering or be shares representing
            reinvested dividends from shares of Common Stock acquired in
            this offering. Third, the Original Shares must have been
            continuously maintained in a Merrill Lynch securities account.
            Fourth, there must be a minimum purchase of $250 to be eligible
            for the investment option. Class D shares of the mutual funds
            are subject to an account maintenance fee at an annual rate of
            up to 0.25% of the average daily net asset value of such mutual
            fund. See "Mutual Fund Investment Option."
 
                                       6
<PAGE>
 
                    RISK FACTORS AND SPECIAL CONSIDERATIONS
 
  The Fund is a newly organized, non-diversified, closed-end management
investment company and has no operating history. Shares of closed-end
investment companies frequently trade at a discount from their net asset value.
This risk may be greater for investors expecting to sell their shares in a
relatively short period after completion of the public offering. Accordingly,
the Common Stock of the Fund is designed primarily for long-term investors and
should not be considered a vehicle for trading purposes. The net asset value of
the Fund's shares of Common Stock will fluctuate with interest rate changes as
well as with price changes of the Fund's portfolio securities, and these
fluctuations are likely to be greater in the case of a fund having a leveraged
capital structure, as contemplated for the Fund. See "Risks and Special
Considerations of Leverage."
 
  The Fund has registered as a "non-diversified" investment company so that it
will be able to invest more than 5% of its assets in the obligations of any
single issuer, subject to the diversification requirements of Subchapter M of
the Internal Revenue Code of 1986, as amended (the "Code"), applicable to the
Fund. Since the Fund may invest a relatively high percentage of its assets in
the obligations of a limited number of issuers, the Fund may be more
susceptible than a more widely-diversified fund to any single economic,
political or regulatory occurrence.
 
  The Fund intends to invest in municipal obligations that are rated in the
investment grade rating categories by Standard & Poor's ("S&P"), Moody's
Investors Service, Inc. ("Moody's") or Fitch IBCA, Inc. ("Fitch") or, if not
rated, are considered to be of comparable quality by the Investment Adviser.
Obligations rated in the lowest investment grade category may have certain
speculative characteristics. See "Investment Objective and Policies." The Fund
may invest in certain tax-exempt securities classified as "private activity
bonds" that may subject certain investors in the Fund to the alternative
minimum tax. See "Taxes--General."
 
  The Fund will be subject to certain restrictions on investments imposed by
guidelines of the insurance companies issuing the portfolio insurance and to
guidelines of one or more NRSROs that may issue ratings for the preferred
stock. These guidelines may impose asset coverage or portfolio composition
requirements that are more stringent than those imposed by the 1940 Act. It is
not anticipated that these covenants or guidelines will impede the Investment
Adviser from managing the Fund's portfolio in accordance with the Fund's
investment objective and policies.
 
  In order to seek to hedge various portfolio positions or to enhance its
return, the Fund may invest in certain instruments that may be characterized as
derivatives. These investments include various types of options transactions
and futures and options thereon. Such investments also may consist of non-
municipal tax-exempt securities and securities the potential investment return
on which is based on the change in particular measurements of value or interest
rates ("indexed securities"), including securities the potential investment
return on which is inversely related to a change in particular measurements of
value or interest rates ("inverse securities"). Certain of such investments may
be made solely for hedging purposes, not for speculation, and may in some cases
require limitations as to the type of permissible counterparty to the
transaction. Investments in indexed securities, including inverse securities,
subject the Fund to the risks associated with changes in the particular
indices, which may include reduced or eliminated interest payments and losses
of invested principal. Derivative instruments may have certain characteristics
that have a similar effect on the return to Common Stock investors as the
leverage transactions discussed under "Risks and Special Considerations of
Leverage;"
 
                                       7
<PAGE>
 
however, certain derivative investments will not be taken into account for
purposes of calculating the percentage of leverage of the Fund's portfolio. For
a further discussion of the risks associated with derivative investments, see
"Investment Objective and Policies," "Investment Objective and Policies--Other
Investment Policies--Indexed and Inverse Floating Obligations," "--Call Rights"
and "Investment Objective and Policies--Options and Futures Transactions."
 
  Subject to its investment restrictions, the Fund is authorized to engage in
options and futures transactions on exchanges and in the over-the-counter
markets ("OTC options") for hedging purposes with certain specified entities
meeting the criteria of the Fund. These transactions involve certain risk
considerations. These risks include the risk of imperfect correlation in
movements in the price of futures contracts and movements in the price of the
security that is the subject of the hedge and the inability to close futures
transactions under certain conditions. Because of the anticipated leveraged
nature of the Common Stock, hedging transactions will result in a larger impact
on the net asset value of the Common Stock than would be the case if the Common
Stock were not leveraged. Certain OTC options and assets used to cover OTC
options written by the Fund may be considered to be illiquid. The illiquidity
of such options or assets may prevent a successful sale of such options or
assets, result in a delay of sale, or reduce the amount of proceeds that might
be otherwise realized. See "Investment Objective and Policies--Options and
Futures Transactions." The Fund intends to apply for ratings of the preferred
stock from one or more NRSROs. In order to obtain these ratings, the Fund may
be required to limit its use of hedging techniques in accordance with the
specified guidelines of such NRSRO.
 
  The Fund's Articles of Incorporation include provisions that could have the
effect of limiting the ability of other entities or persons to acquire control
of the Fund or to change the composition of its Board of Directors and could
have the effect of depriving shareholders of an opportunity to sell their
shares at a premium over prevailing market prices by discouraging a third party
from seeking to obtain control of the Fund. See "Description of Capital Stock--
Certain Provisions of the Articles of Incorporation."
 
                                       8
<PAGE>
 
                                   FEE TABLE
 
<TABLE>
<S>                                                                       <C>
SHAREHOLDER TRANSACTION EXPENSES:
  Maximum Sales Load (as a percentage of offering price)................  None
  Dividend Reinvestment Plan Fees.......................................  None
ANNUAL EXPENSES (as a percentage of net assets attributable to shares of
 Common Stock):
  Management Fees(a)(b).................................................  0.55%
  Interest Payments on Borrowed Funds...................................  None
  Other Expenses(b).....................................................  0.10%
                                                                          ----
    Total Annual Expenses(b)............................................  0.65%
                                                                          ====
</TABLE>
 
<TABLE>   
<CAPTION>
                                                                 1 YEAR 3 YEARS
  EXAMPLE                                                        ------ -------
<S>                                                              <C>    <C>
  An investor would pay the following expenses on a $1,000
  investment, assuming (1) total annual expenses of 0.65%
  (assuming no leverage) and 1.21% (assuming leverage) and (2) a
  5% annual return throughout the periods:
  Assuming No Leverage..........................................  $ 7     $21
  Assuming Leverage.............................................  $12     $38
</TABLE>    
- --------
(a) See "Investment Advisory and Management Arrangements"--page 26.
   
(b) In the event that the Fund utilizes leverage by issuing preferred stock in
  an amount of approximately 40% of the Fund's capital, it is estimated that,
  as a percentage of net assets attributable to Common Stock, the Management
  Fees would be 0.92%, Other Expenses would be 0.29% and Total Annual Expenses
  would be 1.21%. See "Risks and Special Considerations of Leverage."     
 
  The foregoing Fee Table is intended to assist investors in understanding the
costs and expenses that a shareholder in the Fund will bear directly or
indirectly. The expenses set forth under "Other Expenses" are based on
estimated amounts through the end of the Fund's first fiscal year on an
annualized basis. The Example set forth above assumes reinvestment of all
dividends and distributions and utilizes a 5% annual rate of return as
mandated by Securities and Exchange Commission regulations. THE EXAMPLE SHOULD
NOT BE CONSIDERED A REPRESENTATION OF FUTURE EXPENSES OR ANNUAL RATE OF
RETURN, AND ACTUAL EXPENSES OR ANNUAL RATE OF RETURN MAY BE MORE OR LESS THAN
THOSE ASSUMED FOR PURPOSES OF THE EXAMPLE.
 
                                       9
<PAGE>
 
                                   THE FUND
 
  MuniHoldings Insured Fund, Inc. (the "Fund") is a newly organized, non-
diversified, closed-end management investment company. The Fund was
incorporated under the laws of the State of Maryland on March 11, 1998, and
has registered under the 1940 Act. The Fund's principal office is located at
800 Scudders Mill Road, Plainsboro, New Jersey 08536, and its telephone number
is (609) 282-2800.
 
  The Fund has been organized as a closed-end investment company. Closed-end
investment companies differ from open-end investment companies (commonly
referred to as "mutual funds") in that closed-end investment companies do not
generally make a continuous offering of their shares or redeem their
securities at the option of the shareholder, whereas open-end companies issue
securities redeemable at net asset value at any time at the option of the
shareholder and typically engage in a continuous offering of their shares.
Accordingly, open-end investment companies are subject to continuous asset in-
flows and out-flows that can complicate portfolio management. Shares of
closed-end investment companies, however, frequently trade at a discount from
their net asset value. This risk may be greater for investors expecting to
sell their shares in a relatively short period after completion of the public
offering.
 
                                USE OF PROCEEDS
   
  The net proceeds of this offering will be approximately $179,637,000 (or
approximately $206,637,000 assuming the Underwriter exercises the over-
allotment option in full) after payment of organizational and offering
expenses.     
 
  The net proceeds of the offering will be invested in accordance with the
Fund's investment objective and policies within approximately three months
after completion of the offering of Common Stock, depending on market
conditions and the availability of appropriate securities. Pending such
investment, it is anticipated that the proceeds will be invested in short-
term, tax-exempt securities. See "Investment Objective and Policies."
 
                       INVESTMENT OBJECTIVE AND POLICIES
   
  The investment objective of the Fund is to provide shareholders with current
income exempt from Federal income taxes. The Fund seeks to achieve its
investment objective by investing primarily in a portfolio of long-term,
investment grade municipal obligations issued by or on behalf of states,
territories and possessions of the United States and their political
subdivisions, agencies or instrumentalities, paying interest that, in the
opinion of bond counsel to the issuer, is exempt from Federal income taxes
("Municipal Bonds"). The Fund, at all times, except during interim periods
pending investment of the net proceeds of public offerings of the Fund's
securities and during temporary defensive periods, will invest at least 80% of
its total assets in Municipal Bonds. Under normal circumstances, at least 80%
of the Fund's assets will be invested in municipal obligations with remaining
maturities of one year or more that are covered by insurance guaranteeing the
timely payment of principal at maturity and interest. The Fund may invest all
or a portion of its assets in certain tax-exempt securities classified as
"private activity bonds" (in general, bonds that benefit non-governmental
entities) that may subject certain     
 
                                      10
<PAGE>
 
investors in the Fund to an alternative minimum tax. The Fund will not invest
more than 25% of its total assets (taken at market value) in Municipal Bonds
whose issuers are located in the same state. At times the Fund may seek to
hedge its portfolio through the use of futures transactions and options to
reduce volatility in the net asset value of its shares of Common Stock. The
investment objective of the Fund is a fundamental policy that may not be
changed without a vote of a majority of the Fund's outstanding voting
securities, as defined below under "Investment Restrictions." There can be no
assurance that the investment objective of the Fund will be realized.
 
  The Fund also may invest in securities not issued by or on behalf of a state
or territory or by an agency or instrumentality thereof, if the Fund
nevertheless believes such securities pay interest or distributions that are
exempt from Federal income taxation ("Non-Municipal Tax-Exempt Securities").
Non-Municipal Tax-Exempt Securities may include securities issued by other
investment companies that invest in Municipal Bonds, to the extent such
investments are permitted by the 1940 Act. Other Non-Municipal Tax-Exempt
Securities could include trust certificates or other instruments evidencing
interests in one or more long-term Municipal Bonds. Certain Non-Municipal Tax-
Exempt Securities may be characterized as derivative instruments. Non-
Municipal Tax-Exempt Securities will be considered "Municipal Bonds" for
purposes of the Fund's investment objective and policies.
 
  Investment in shares of Common Stock of the Fund offers several potential
benefits. The Fund offers investors the opportunity to receive income exempt
from Federal income taxes by investing in a professionally managed portfolio
comprised primarily of investment grade insured Municipal Bonds. Investment in
the Fund also relieves the investor of the burdensome administrative details
involved in managing a portfolio of Municipal Bonds. Additionally, the
Investment Adviser will seek to enhance the yield on the Common Stock by
leveraging the Fund's capital structure through the issuance of preferred
stock. The benefits are at least partially offset by the expenses involved in
operating an investment company. Such expenses primarily consist of the
advisory fee and operational costs. Additionally, the use of leverage involves
certain expenses and special risk considerations. See "Risks and Special
Considerations of Leverage."
 
  The investment grade Municipal Bonds in which the Fund will primarily invest
are those Municipal Bonds rated at the date of purchase in the four highest
rating categories of S&P, Moody's or Fitch or, if unrated, are considered to
be of comparable quality by the Investment Adviser. In the case of long-term
debt, the investment grade rating categories are AAA through BBB for S&P, Aaa
through Baa for Moody's and AAA through BBB for Fitch. In the case of short-
term notes, the investment grade rating categories are SP-l+ through SP-3 for
S&P, MIG-1 through MIG-4 for Moody's and F-1+ through F-3 for Fitch. In the
case of tax-exempt commercial paper, the investment grade rating categories
are A-1+ through A-3 for S&P, Prime-1 through Prime-3 for Moody's and F-l+
through F-3 for Fitch. Obligations ranked in the fourth highest rating
category (BBB, SP-3 and A-3 for S&P; Baa, MIG-4 and Prime-3 for Moody's; and
BBB and F-3 for Fitch), while considered "investment grade," may have certain
speculative characteristics. There may be sub-categories or gradations
indicating relative standing within the rating categories set forth above. See
Appendix I to this Prospectus for a description of S&P's, Moody's and Fitch's
ratings of Municipal Bonds. In assessing the quality of Municipal Bonds with
respect to the foregoing requirements, the Investment Adviser will take into
account the portfolio insurance as well as the nature of any letters of credit
or similar credit enhancements to which particular Municipal Bonds are
entitled and the creditworthiness of the insurance company or the financial
institution that provided such insurance or credit enhancements. Consequently,
if Municipal Bonds are covered by insurance policies issued by
 
                                      11
<PAGE>
 
insurers whose claims-paying ability is rated AAA by S&P or Fitch or Aaa by
Moody's, the Investment Adviser may consider such municipal obligations to be
equivalent to AAA- or Aaa- rated securities, as the case may be, even though
such Municipal Bonds would generally be assigned a lower rating if the rating
were based primarily upon the credit characteristics of the issuers without
regard to the insurance feature. The insured Municipal Bonds must also comply
with the standards applied by the insurance carriers in determining
eligibility for portfolio insurance.
 
 
  The Fund's investments may also include variable rate demand obligations
("VRDOs") and VRDOs in the form of participation interests ("Participating
VRDOs") in variable rate tax-exempt obligations held by a financial
institution, typically a commercial bank. The VRDOs in which the Fund will
invest are tax-exempt obligations, in the opinion of counsel to the issuer,
that contain a floating or variable interest rate adjustment formula and an
unconditional right of demand on the part of the holder thereof to receive
payment of the unpaid principal balance plus accrued interest on a short
notice period not to exceed seven days. Participating VRDOs provide the Fund
with a specified undivided interest (up to 100%) in the underlying obligation
and the right to demand payment of the unpaid principal balance plus accrued
interest on the Participating VRDOs from the financial institution on a
specified number of days' notice, not to exceed seven days. There is, however,
the possibility that because of default or insolvency, the demand feature of
VRDOs or Participating VRDOs may not be honored. The Fund has been advised by
its counsel that the Fund should be entitled to treat the income received on
Participating VRDOs as interest from tax-exempt obligations.
 
  The average maturity of the Fund's portfolio securities will vary based upon
the Investment Adviser's assessment of economic and market conditions. The net
asset value of the shares of common stock of a closed-end investment company,
such as the Fund, which invests primarily in fixed-income securities, changes
as the general levels of interest rates fluctuate. When interest rates
decline, the value of a fixed-income portfolio can be expected to rise.
Conversely, when interest rates rise, the value of a fixed-income portfolio
can be expected to decline. Prices of longer-term securities generally
fluctuate more in response to interest rate changes than do short-term or
medium-term securities. These changes in net asset value are likely to be
greater in the case of a fund having a leveraged capital structure, as
proposed for the Fund. See "Risks and Special Considerations of Leverage."
 
  The Fund intends to invest primarily in long-term Municipal Bonds with a
maturity of more than ten years. Also, the Fund may invest in intermediate-
term Municipal Bonds with a maturity of between three years and ten years. The
Fund may invest in short-term, tax-exempt securities, short-term U.S.
Government securities, repurchase agreements or cash. Such short-term
securities or cash will not exceed 20% of its total assets except during
interim periods pending investment of the net proceeds of public offerings of
the Fund's securities or in anticipation of the repurchase or redemption of
the Fund's securities and temporary periods when, in the opinion of the
Investment Adviser, prevailing market or economic conditions warrant. The Fund
does not ordinarily intend to realize significant interest income not exempt
from Federal income taxes.
 
  The Fund is classified as non-diversified within the meaning of the 1940
Act, which means that the Fund is not limited by such Act in the proportion of
its assets that it may invest in securities of a single issuer. However, the
Fund's investments will be limited so as to qualify the Fund for special tax
treatment afforded regulated investment companies under the Code. See "Taxes."
To qualify, among other requirements, the Fund will limit its investments so
that, at the close of each quarter of the taxable year, (i) not more than 25%
of the market value of the Fund's total assets will be invested in the
securities (other than U.S. Government securities) of a
 
                                      12
<PAGE>
 
single issuer, and (ii) with respect to 50% of the market value of its total
assets, not more than 5% of the market value of its total assets will be
invested in the securities (other than U.S. Government securities) of a single
issuer. A fund that elects to be classified as "diversified" under the 1940
Act must satisfy the foregoing 5% requirement with respect to 75% of its total
assets. To the extent that the Fund assumes large positions in the securities
of a small number of issuers, the Fund's yield may fluctuate to a greater
extent than that of a diversified company as a result of changes in the
financial condition or in the market's assessment of the issuers.
 
PORTFOLIO INSURANCE
   
  Under normal circumstances, at least 80% of the Fund's assets will be
invested in Municipal Bonds either (i) insured under an insurance policy
purchased by the Fund or (ii) insured under an insurance policy obtained by
the issuer thereof or any other party. The Fund will seek to limit its
investments to municipal bonds insured under insurance policies issued by
insurance carriers that have total admitted assets (unaudited) of at least
$75,000,000 and capital and surplus (unaudited) of at least $50,000,000 and
insurance claims-paying ability ratings of AAA from S&P or Fitch or Aaa from
Moody's. There can be no assurance that insurance from insurance carriers
meeting these criteria will be at all times available. See Appendix II to this
Prospectus for a brief description of S&P's, Fitch's and Moody's insurance
claims-paying ability ratings. Currently, it is anticipated that a majority of
the Municipal Bonds in the Fund's portfolio will be insured by the following
insurance companies that satisfy the foregoing criteria: AMBAC Indemnity
Corporation, Financial Guaranty Insurance Company, Financial Security
Assurance and Municipal Bond Investors Assurance Corporation. The Fund also
may purchase Municipal Bonds covered by insurance issued by any other
insurance company that satisfies the foregoing criteria. It is anticipated
that initially a majority of insured Municipal Bonds held by the Fund will be
insured under policies obtained by parties other than the Fund.     
 
  The Fund may purchase, but has no obligation to purchase, separate insurance
policies (the "Policies") from insurance companies meeting the criteria set
forth above that guarantee the payment of principal and interest on specified
eligible Municipal Bonds purchased by the Fund. A Municipal Bond will be
eligible for coverage if it meets certain requirements of the insurance
company set forth in a Policy. In the event interest or principal on an
insured Municipal Bond is not paid when due, the insurer will be obligated
under its Policy to make such payment not later than 30 days after it has been
notified by, and provided with documentation from, the Fund that such
nonpayment has occurred.
 
  The Policies will be effective only as to insured Municipal Bonds
beneficially owned by the Fund. In the event of a sale of any Municipal Bonds
held by the Fund, the issuer of the relevant Policy will be liable only for
those payments of interest and principal that are then due and owing. The
Policies will not guarantee the market value of the insured Municipal Bonds or
the value of the shares of the Fund.
 
  The insurer will not have the right to withdraw coverage on securities
insured by their Policies and held by the Fund so long as such securities
remain in the Fund's portfolio. In addition, the insurer may not cancel its
Policies for any reason except failure to pay premiums when due. The Board of
Directors of the Fund will reserve the right to terminate any of the Policies
if it determines that the benefits to the Fund of having its portfolio insured
under such policy are not justified by the expense involved.
 
  The premiums for the Policies are paid by the Fund and the yield on the
Fund's portfolio is reduced thereby. The Investment Adviser estimates that the
cost of the annual premiums for the Policies currently ranges from
approximately .02 of 1% to .15 of 1% of the principal amount of the Municipal
Bonds covered by such Policies.
 
                                      13
<PAGE>
 
The estimate is based on the expected composition of the Fund's portfolio of
Municipal Bonds. Additional information regarding the Policies is set forth in
Appendix II to this Prospectus. In instances in which the Fund purchases
Municipal Bonds insured under policies obtained by parties other than the
Fund, the Fund does not pay the premiums for such policies; rather, the cost
of such policies may be reflected in the purchase price of the Municipal
Bonds.
 
  It is the intention of the Investment Adviser to retain any insured
securities that are in default or in significant risk of default and to place
a value on the insurance, which ordinarily will be the difference between the
market value of the defaulted security and the market value of similar
securities that are not in default. In certain circumstances, however, the
Investment Adviser may determine that an alternate value for the insurance,
such as the difference between the market value of the defaulted security and
its par value, is more appropriate. The Investment Adviser's ability to manage
the portfolio may be limited to the extent it holds defaulted securities,
which may limit its ability in certain circumstances to purchase other
Municipal Bonds. See "Net Asset Value" below for a more complete description
of the Fund's method of valuing defaulted securities and securities that have
a significant risk of default.
 
  There can be no assurance that insurance with the terms and issued by
insurance carriers meeting the criteria described above will continue to be
available to the Fund. In the event the Board of Directors determines that
such insurance is unavailable or that the cost of such insurance outweighs the
benefits to the Fund, the Fund may modify the criteria for insurance carriers
or the terms of the insurance, or may discontinue its policy of maintaining
insurance for all or any of the Municipal Bonds held in the Fund's portfolio.
Although the Investment Adviser periodically reviews the financial condition
of each insurer, there can be no assurance that the insurers will be able to
honor their obligations under all circumstances.
 
  The portfolio insurance reduces financial or credit risk (i.e., the
possibility that the owners of the insured Municipal Bonds will not receive
timely scheduled payments of principal or interest). However, the insured
Municipal Bonds are subject to market risk (i.e., fluctuations in market value
as a result of changes in prevailing interest rates).
 
DESCRIPTION OF MUNICIPAL BONDS
 
  Municipal Bonds include debt obligations issued to obtain funds for various
public purposes, including construction of a wide range of public facilities,
refunding of outstanding obligations and obtaining funds for general operating
expenses and loans to other public institutions and facilities. In addition,
certain types of industrial development bonds are issued by or on behalf of
public authorities to finance various privately-operated facilities, including
certain local facilities for water supply, gas, electricity, sewage or solid
waste disposal. For purposes of this Prospectus, such obligations are
Municipal Bonds if the interest paid thereon is exempt from Federal income
tax, even though such bonds may be industrial development bonds ("IDBs") or
"private activity bonds" as discussed below. Also, for purposes of this
Prospectus, Non-Municipal Tax-Exempt securities as discussed above will be
considered Municipal Bonds.
 
  The two principal classifications of Municipal Bonds are "general
obligation" bonds and "revenue" bonds, which latter category includes IDBs
and, for bonds issued after August 15, 1986, private activity bonds. General
obligation bonds are secured by the issuer's pledge of faith, credit and
taxing power for the repayment of principal and the payment of interest.
Revenue or special obligation bonds are payable only from the revenues derived
from a particular facility or class of facilities or, in some cases, from the
proceeds of a special excise tax
 
                                      14
<PAGE>
 
or other specific revenue source such as from the user of the facility being
financed. IDBs are in most cases revenue bonds and do not generally constitute
the pledge of the credit or taxing power of the issuer of such bonds. The
repayment of principal and the payment of interest on such industrial
development bonds depends solely on the ability of the user of the facility
financed by the bonds to meet its financial obligations and the pledge, if
any, of real and personal property so financed as security for such payment.
Municipal Bonds may also include "moral obligation" bonds, which are normally
issued by special purpose public authorities. If an issuer of moral obligation
bonds is unable to meet its obligations, the repayment of such bonds becomes a
moral commitment but not a legal obligation of the state or municipality in
question.
 
  The Fund may purchase Municipal Bonds classified as "private activity bonds"
(in general, bonds that benefit non-governmental entities). Interest received
on certain tax-exempt securities that are classified as "private activity
bonds" may subject certain investors in the Fund to an alternative minimum
tax. There is no limitation on the percentage of the Fund's assets that may be
invested in Municipal Bonds that may subject certain investors to an
alternative minimum tax. See "Taxes--General." Also included within the
general category of Municipal Bonds are participation certificates issued by
government authorities or entities to finance the acquisition or construction
of equipment, land and/or facilities. The certificates represent
participations in a lease, an installment purchase contract or a conditional
sales contract (hereinafter collectively referred to as "lease obligations")
relating to such equipment, land or facilities. Although lease obligations do
not constitute general obligations of the issuer for which the issuer's
unlimited taxing power is pledged, a lease obligation frequently is backed by
the issuer's covenant to budget for, appropriate and make the payments due
under the lease obligation. However, certain lease obligations contain "non-
appropriation" clauses, which provide that the issuer has no obligation to
make lease or installment purchase payments in future years unless money is
appropriated for such purpose on a yearly basis. Although "non-appropriation"
lease obligations are secured by the lease property, disposition of the
property in the event of foreclosure might prove difficult. These securities
represent a relatively new type of financing that has not yet developed the
depth of marketability associated with more conventional securities.
 
  Federal tax legislation has limited the types and volume of bonds the
interest on which qualifies for a Federal income tax exemption. As a result,
this legislation and legislation that may be enacted in the future may affect
the availability of Municipal Bonds for investment by the Fund.
 
OTHER INVESTMENT POLICIES
 
  The Fund has adopted certain other policies as set forth below:
 
  Borrowings. The Fund is authorized to borrow money in amounts of up to 5% of
the value of its total assets at the time of such borrowings; provided,
however, that the Fund is authorized to borrow moneys in amounts of up to 33
1/3% of the value of its total assets at the time of such borrowings to
finance the repurchase of its own Common Stock pursuant to tender offers or
otherwise to redeem or repurchase shares of preferred stock or for temporary,
extraordinary or emergency purposes. Borrowings by the Fund (commonly known,
as with the issuance of preferred stock, as "leveraging") create an
opportunity for greater total return since the Fund will not be required to
sell portfolio securities to repurchase or redeem shares but, at the same
time, increase exposure to capital risk. In addition, borrowed funds are
subject to interest costs that may offset or exceed the return earned on the
borrowed funds.
 
                                      15
<PAGE>
 
  When-Issued Securities and Delayed Delivery Transactions. The Fund may
purchase or sell Municipal Bonds on a delayed delivery basis or on a when-
issued basis at fixed purchase or sale terms. These transactions arise when
securities are purchased or sold by the Fund with payment and delivery taking
place in the future. The purchase will be recorded on the date the Fund enters
into the commitment, and the value of the obligation will thereafter be
reflected in the calculation of the Fund's net asset value. The value of the
obligation on the delivery day may be more or less than its purchase price. A
separate account of the Fund will be established with its custodian consisting
of cash, cash equivalents or liquid securities having a market value at all
times at least equal to the amount of the commitment.
 
  Indexed and Inverse Floating Obligations. The Fund may invest in Municipal
Bonds the return on which is based on a particular index of value or interest
rates. For example, the Fund may invest in Municipal Bonds that pay interest
based on an index of Municipal Bond interest rates. The principal amount
payable upon maturity of certain Municipal Bonds also may be based on the
value of an index. To the extent the Fund invests in these types of Municipal
Bonds, the Fund's return on such Municipal Bonds will be subject to risk with
respect to the value of the particular index. Also, the Fund may invest in so-
called "inverse floating obligations" or "residual interest bonds" on which
the interest rates typically vary inversely with a short-term floating rate
(which may be reset periodically by a dutch auction, a remarketing agent, or
by reference to a short-term tax-exempt interest rate index). The Fund may
purchase in the secondary market synthetically-created inverse floating rate
bonds evidenced by custodial or trust receipts. Generally, interest rates on
inverse floating rate bonds will decrease when short-term rates increase, and
will increase when short-term rates decrease. Such securities have the effect
of providing a degree of investment leverage, since they may increase or
decrease in value in response to changes, as an illustration, in market
interest rates at a rate that is a multiple (typically two) of the rate at
which fixed-rate, long-term, tax-exempt securities increase or decrease in
response to such changes. As a result, the market values of such securities
generally will be more volatile than the market values of fixed-rate tax-
exempt securities. To seek to limit the volatility of these securities, the
Fund may purchase inverse floating obligations with shorter-term maturities or
limitations on the extent to which the interest rate may vary. The Investment
Adviser believes that indexed and inverse floating obligations represent a
flexible portfolio management instrument for the Fund that allows the
Investment Adviser to vary the degree of investment leverage relatively
efficiently under different market conditions.
 
  Call Rights. The Fund may purchase a Municipal Bond issuer's right to call
all or a portion of such Municipal Bond for mandatory tender for purchase (a
"Call Right"). A holder of a Call Right may exercise such right to require a
mandatory tender for the purchase of related Municipal Bonds, subject to
certain conditions. A Call Right that is not exercised prior to the maturity
of the related Municipal Bond will expire without value. The economic effect
of holding both the Call Right and the related Municipal Bond is identical to
holding a Municipal Bond as a non-callable security.
 
  Repurchase Agreements. The Fund may invest in securities pursuant to
repurchase agreements. Repurchase agreements may be entered into only with a
member bank of the Federal Reserve System or a primary dealer in U.S.
Government securities or an affiliate thereof. Under such agreements, the
seller agrees, upon entering into the contract, to repurchase the security at
a mutually agreed-upon time and price, thereby determining the yield during
the term of the agreement. The Fund may not invest in repurchase agreements
maturing in more than seven days if such investments, together with all other
illiquid investments, would exceed 15% of the Fund's net assets. In the event
of default by the seller under a repurchase agreement, the Fund may suffer
time delays and incur costs or possible losses in connection with the
disposition of the underlying securities.
 
                                      16
<PAGE>
 
  In general, for Federal income tax purposes, repurchase agreements are
treated as collateralized loans secured by the securities "sold." Therefore,
amounts earned under such agreements will not be considered tax-exempt
interest.
 
OPTIONS AND FUTURES TRANSACTIONS
 
  The Fund may hedge all or a portion of its portfolio investments against
fluctuations in interest rates through the use of options and certain
financial futures contracts and options thereon. While the Fund's use of
hedging strategies is intended to reduce the volatility of the net asset value
of the Common Stock, the net asset value of the Common Stock will fluctuate.
There can be no assurance that the Fund's hedging transactions will be
effective. In addition, because of the anticipated leveraged nature of the
Common Stock, hedging transactions will result in a larger impact on the net
asset value of the Common Stock than would be the case if the Common Stock
were not leveraged. Furthermore, the Fund will only engage in hedging
activities from time to time and may not necessarily be engaging in hedging
activities when movements in interest rates occur.
 
  Certain Federal income tax requirements may limit the Fund's ability to
engage in hedging transactions. Gains from transactions in options and futures
contracts distributed to shareholders will be taxable as ordinary income or,
in certain circumstances, as long-term capital gains to shareholders. See
"Taxes--Tax Treatment of Options and Futures Transactions." In addition, in
order to obtain ratings of the preferred stock from one or more NRSROs, the
Fund may be required to limit its use of hedging techniques in accordance with
the specified guidelines of such organizations.
 
  The following is a description of the options and futures transactions in
which the Fund may engage, limitations on the use of such transactions and
risks associated therewith. The investment policies with respect to the
hedging transactions of the Fund are not fundamental policies and may be
modified by the Board of Directors of the Fund without the approval of the
Fund's shareholders.
 
  Writing Covered Call Options.  The Fund may write (i.e., sell) covered call
options with respect to Municipal Bonds it owns, thereby giving the holder of
the option the right to buy the underlying security covered by the option from
the Fund at the stated exercise price until the option expires. The Fund
writes only covered call options, which means that so long as the Fund is
obligated as the writer of a call option, it will own the underlying
securities subject to the option. The Fund may not write covered call options
on underlying securities in an amount exceeding 15% of the market value of its
total assets.
 
  The Fund will receive a premium from writing a call option, which increases
the Fund's return on the underlying security in the event the option expires
unexercised or is closed out at a profit. By writing a call, the Fund limits
its opportunity to profit from an increase in the market value of the
underlying security above the exercise price of the option for as long as the
Fund's obligation as a writer continues. Covered call options serve as a
partial hedge against a decline in the price of the underlying security. The
Fund may engage in closing transactions in order to terminate outstanding
options that it has written.
 
  Purchase of Options. The Fund may purchase put options in connection with
its hedging activities. By buying a put the Fund has a right to sell the
underlying security at the exercise price, thus limiting the Fund's risk of
loss through a decline in the market value of the security until the put
expires. The amount of any appreciation in the value of the underlying
security will be partially offset by the amount of the premium paid for the
put option and any related transaction costs. Prior to its expiration, a put
option may be sold in a closing
 
                                      17
<PAGE>
 
sale transaction; profit or loss from the sale will depend on whether the
amount received is more or less than the premium paid for the put option plus
the related transaction costs. A closing sale transaction cancels out the
Fund's position as the purchaser of an option by means of an offsetting sale
of an identical option prior to the expiration of the option it has purchased.
In certain circumstances, the Fund may purchase call options on securities
held in its portfolio on which it has written call options or on securities
that it intends to purchase. The Fund will not purchase options on securities
if, as a result of such purchase, the aggregate cost of all outstanding
options on securities held by the Fund would exceed 5% of the market value of
the Fund's total assets.
 
  Financial Futures Contracts and Options. The Fund is authorized to purchase
and sell certain financial futures contracts and options thereon solely for
the purpose of hedging its investments in Municipal Bonds against declines in
value and to hedge against increases in the cost of securities it intends to
purchase. A financial futures contract obligates the seller of a contract to
deliver and the purchaser of a contract to take delivery of the type of
financial instrument covered by the contract or, in the case of index-based
futures contracts, to make and accept a cash settlement, at a specific future
time for a specified price. A sale of financial futures contracts may provide
a hedge against a decline in the value of portfolio securities because such
depreciation may be offset, in whole or in part, by an increase in the value
of the position in the financial futures contracts. A purchase of financial
futures contracts may provide a hedge against an increase in the cost of
securities intended to be purchased because such appreciation may be offset,
in whole or in part, by an increase in the value of the position in the
futures contracts.
 
  The purchase or sale of a futures contract differs from the purchase or sale
of a security in that no price or premium is paid or received. Instead, an
amount of cash or securities acceptable to the broker equal to approximately
5% of the contract amount must be deposited with the broker. This amount is
known as initial margin. Subsequent payments to and from the broker, called
variation margin, are made on a daily basis as the price of the financial
futures contract fluctuates making the long and short positions in the
financial futures contract more or less valuable.
 
  The Fund may purchase and sell financial futures contracts based on The Bond
Buyer Municipal Bond Index, a price-weighted measure of the market value of 40
large tax-exempt issues, and purchase and sell put and call options on such
financial futures contracts for the purpose of hedging Municipal Bonds that
the Fund holds or anticipates purchasing against adverse changes in interest
rates. The Fund also may purchase and sell financial futures contracts on U.S.
Government securities and purchase and sell put and call options on such
financial futures contracts for such hedging purposes. With respect to U.S.
Government securities, currently there are financial futures contracts based
on long-term U.S. Treasury bonds, U.S. Treasury notes, GNMA Certificates and
three-month U.S. Treasury bills.
 
  Subject to policies adopted by the Board of Directors, the Fund also may
engage in transactions in other financial futures contracts, such as financial
futures contracts on other municipal bond indices that may become available,
if the Investment Adviser should determine that there is normally sufficient
correlation between the prices of such financial futures contracts and the
Municipal Bonds in which the Fund invests to make such hedging appropriate.
 
  Over-The-Counter Options. The Fund may engage in options and futures
transactions on exchanges and in the over-the-counter markets ("OTC options").
In general, exchange-traded contracts are third-party contracts (i.e.,
performance of the parties' obligations is guaranteed by an exchange or
clearing corporation) with standardized strike prices and expiration dates.
OTC options transactions are two-party contracts with prices and
 
                                      18
<PAGE>
 
terms negotiated by the buyer and seller. See "Restrictions on OTC Options"
below for information as to restrictions on the use of OTC options.
 
  Restrictions on OTC Options. The Fund will engage in transactions in OTC
options only with banks or dealers that have capital of at least $50 million
or whose obligations are guaranteed by an entity having capital of at least
$50 million. Certain OTC options and assets used to cover OTC options written
by the Fund may be considered to be illiquid. The illiquidity of such options
or assets may prevent a successful sale of such options or assets, result in a
delay of sale, or reduce the amount of proceeds that might otherwise be
realized.
 
  Risk Factors in Options and Futures Transactions. Utilization of futures
transactions involves the risk of imperfect correlation in movements in the
price of financial futures contracts and movements in the price of the
security that is the subject of the hedge. If the price of the financial
futures contract moves more or less than the price of the security that is the
subject of the hedge, the Fund will experience a gain or loss that will not be
completely offset by movements in the price of such security. There is a risk
of imperfect correlation where the securities underlying financial futures
contracts have different maturities, ratings, geographic compositions or other
characteristics than the security being hedged. In addition, the correlation
may be affected by additions to or deletions from the index that serves as a
basis for a financial futures contract. Finally, in the case of financial
futures contracts on U.S. Government securities and options on such financial
futures contracts, the anticipated correlation of price movements between the
U.S. Government securities underlying the futures or options and Municipal
Bonds may be adversely affected by economic, political, legislative or other
developments that have a disparate impact on the respective markets for such
securities.
 
  Under regulations of the Commodity Futures Trading Commission ("CFTC"), the
futures trading activities described herein will not result in the Fund being
deemed a "commodity pool," as defined under such regulations, provided that
the Fund adheres to certain restrictions. In particular, the Fund may purchase
and sell financial futures contracts and options thereon (i) for bona fide
hedging purposes, without regard to the percentage of the Fund's assets
committed to margin and option premiums, and (ii) for non-hedging purposes if,
immediately thereafter, the sum of the amount of initial margin deposits on
the Fund's existing futures positions and option premiums entered into for
non-hedging purposes do not exceed 5% of the market value of the liquidation
value of the Fund's portfolio, after taking into account unrealized profits
and unrealized losses on any such transactions. Margin deposits may consist of
cash or securities acceptable to the broker and the relevant contract market.
 
  When the Fund purchases a financial futures contract, or writes a put option
or purchases a call option thereon, it will maintain an amount of cash, cash
equivalents (e.g., commercial paper and daily tender adjustable notes) or
liquid securities in a segregated account with the Fund's custodian so that
the amount so segregated plus the amount of initial and variation margin held
in the account of its broker equals the market value of the financial futures
contract, thereby ensuring that the use of such financial futures contract is
unleveraged.
 
  Although certain risks are involved in options and futures transactions, the
Investment Adviser believes that, because the Fund will engage in options and
futures transactions only for hedging purposes, the options and futures
portfolio strategies of the Fund will not subject the Fund to certain risks
frequently associated with speculation in options and futures transactions.
 
  The volume of trading in the exchange markets with respect to Municipal Bond
options may be limited, and it is impossible to predict the amount of trading
interest that may exist in such options. In addition, there can be no
assurance that viable exchange markets will continue to be available.
 
                                      19
<PAGE>
 
  The Fund intends to enter into options and futures transactions, on an
exchange or in the over-the-counter market, only if there appears to be a
liquid secondary market for such options or futures. There can be no
assurance, however, that a liquid secondary market will exist at any specific
time. Thus, it may not be possible to close an options or futures transaction.
The inability to close options and futures positions also could have an
adverse impact on the Fund's ability to effectively hedge its portfolio. There
is also the risk of loss by the Fund of margin deposits or collateral in the
event of bankruptcy of a broker with which the Fund has an open position in an
option or financial futures contract.
 
  The liquidity of a secondary market in a financial futures contract may be
adversely affected by "daily price fluctuation limits" established by
commodity exchanges that limit the amount of fluctuation in a financial
futures contract price during a single trading day. Once the daily limit has
been reached in the contract, no trades may be entered into at a price beyond
the limit, thus preventing the liquidation of open futures positions. Prices
have in the past moved beyond the daily limit on a number of consecutive
trading days.
 
  If it is not possible to close a financial futures position entered into by
the Fund, the Fund would continue to be required to make daily cash payments
of variation margin in the event of adverse price movements. In such a
situation, if the Fund has insufficient cash, it may have to sell portfolio
securities to meet daily variation margin requirements at a time when it may
be disadvantageous to do so.
 
  The successful use of these transactions also depends on the ability of the
Investment Adviser to forecast correctly the direction and extent of interest
rate movements within a given time frame. To the extent these rates remain
stable during the period in which a financial futures contract is held by the
Fund or move in a direction opposite to that anticipated, the Fund may realize
a loss on the hedging transaction that is not fully or partially offset by an
increase in the value of portfolio securities. As a result, the Fund's total
return for such period may be less than if it had not engaged in the hedging
transaction. Furthermore, the Fund will only engage in hedging transactions
from time to time and may not necessarily be engaged in hedging transactions
when movements in interest rates occur.
 
                 RISKS AND SPECIAL CONSIDERATIONS OF LEVERAGE
 
EFFECTS OF LEVERAGE
 
  Within approximately three months after the completion of the offering of
shares of Common Stock, the Fund intends to offer shares of preferred stock
representing approximately 40% of the Fund's capital immediately after the
issuance of such preferred stock. There can be no assurance, however, that
preferred stock representing such percentage of the Fund's capital will
actually be issued. The issuance of the preferred stock will result in the
leveraging of the Common Stock. Although the terms of the preferred stock
offering will be determined by the Fund's Board of Directors, it is
anticipated that the preferred stock will pay dividends that will be adjusted
over either relatively short-term periods (generally seven to 28 days) or
medium-term periods (up to five years) and that the dividend rate will be
based upon prevailing interest rates for debt obligations of comparable
maturity. The proceeds of the preferred stock offering will be invested in
longer-term obligations in accordance with the Fund's investment objective.
Issuance and ongoing expenses of the preferred stock will be borne by the Fund
and will reduce the net asset value of the Common Stock. Additionally, under
certain circumstances, when the Fund is required to allocate taxable income to
holders of preferred stock, it is anticipated that the terms of the preferred
stock will require the Fund to make an additional distribution to such holders
in an amount
 
                                      20
<PAGE>
 
approximately equal to the tax liability resulting from such allocation and
such additional distribution (such amount, an "Additional Distribution").
Because under normal market conditions, obligations with longer maturities
produce higher yields than short-term and medium-term obligations, the
Investment Adviser believes that the spread inherent in the difference between
the short-term and medium-term rates (and any Additional Distribution) paid by
the Fund as dividends on the preferred stock and the longer-term rates
received by the Fund will provide holders of Common Stock with a potentially
higher yield.
 
  Utilization of leverage, however, involves certain risks to the holders of
Common Stock. For example, issuance of the preferred stock may result in
higher volatility of the net asset value of the Common Stock and potentially
more volatility in the market value of the Common Stock. In addition,
fluctuations in the short-term and medium-term dividend rates on, and the
amount of taxable income allocable to, the preferred stock will affect the
yield to holders of Common Stock. So long as the Fund, taking into account the
costs associated with the preferred stock and the Fund's operating expenses,
is able to realize a higher net return on its investment portfolio than the
then current dividend rate (and any Additional Distribution) of the preferred
stock, the effect of leverage will be to cause holders of Common Stock to
realize a higher current rate of return than if the Fund were not leveraged.
Similarly, since a pro rata portion of the Fund's net realized capital gains
on its investment assets are generally payable to holders of Common Stock if
net capital gains are realized by the Fund, the effect of leverage will be to
increase the amount of such gains distributed to holders of Common Stock.
However, short-term, medium-term and long-term interest rates change from time
to time as does their relationship to each other (i.e., the slope of the yield
curve) depending upon such factors as supply and demand forces, monetary and
tax policies and investor expectations. Changes in any or all of such factors
could cause the relationship between short-term, medium-term and long-term
rates to change (i.e, to flatten or to invert the slope of the yield curve) so
that short-term and medium-term rates may substantially increase relative to
the long-term obligations in which the Fund may be invested. To the extent
that the current dividend rate (and any Additional Distribution) on the
preferred stock approaches the net return on the Fund's investment portfolio,
the benefit of leverage to holders of Common Stock will be reduced, and if the
current dividend rate (and any Additional Distribution) on the preferred stock
were to exceed the net return on the Fund's portfolio, the Fund's leveraged
capital structure would result in a lower rate of return to holders of Common
Stock than if the Fund were not leveraged. Similarly, since both the cost
associated with the issuance of preferred stock and any decline in the value
of the Fund's investments (including investments purchased with the proceeds
from any preferred stock offering) will be borne entirely by holders of Common
Stock, the effect of leverage in a declining market would result in a greater
decrease in net asset value to holders of Common Stock than if the Fund were
not leveraged.
 
  In an extreme case, a decline in net asset value could affect the Fund's
ability to pay dividends on the Common Stock. Failure to make such dividend
payments could adversely affect the Fund's qualification as a regulated
investment company under the Code. See "Taxes." The Fund intends, however, to
take all measures necessary to continue to make Common Stock dividend
payments. If the Fund's current investment income were not sufficient to meet
dividend requirements on either the Common Stock or the preferred stock, it
could be necessary for the Fund to liquidate certain of its investments. In
addition, the Fund will have the authority to redeem the preferred stock for
any reason and may redeem all or part of the preferred stock if (i) it
anticipates that the Fund's leveraged capital structure will result in a lower
rate of return for any significant amount of time to holders of the Common
Stock than that obtainable if the Common Stock were unleveraged, (ii) the
asset coverage for the preferred stock declines below 200% either as a result
of a decline in the value of the Fund's portfolio investments or as a result
of the repurchase of Common Stock in tender offers, or (iii) in order to
maintain the asset coverage guidelines established by the NRSROs that have
rated the preferred stock.
 
                                      21
<PAGE>
 
Redemption of the preferred stock or insufficient investment income to make
dividend payments, may reduce the net asset value of the Common Stock and
require the Fund to liquidate a portion of its investments at a time when it
may be disadvantageous, in the absence of such extraordinary circumstances, to
do so.
 
  Assuming the utilization of leverage by the issuance of preferred stock that
pays dividends at a rate that generally will be adjusted every 28 days in an
amount representing approximately 40% of the Fund's capital at an annual
dividend rate of 3.40% payable on such preferred stock based on market rates
as of the date of this Prospectus, the annual return that the Fund's portfolio
must experience (net of expenses) in order to cover such dividend payments
would be 1.36%.
 
  The following table is designed to illustrate the effect on the return to a
holder of the Fund's Common Stock of the leverage obtained by the issuance of
preferred stock representing approximately 40% of the Fund's capital, assuming
hypothetical annual returns on the Fund's portfolio of minus 10% to plus 10%.
As the table shows, leverage generally increases the return to stockholders
when portfolio return is positive and decreases the return when the portfolio
return is negative. The figures appearing in the table are hypothetical and
actual returns may be greater or less than those appearing in the table.
 
<TABLE>
   <S>                                                 <C>   <C>   <C>   <C>  <C>
   Assumed Portfolio Return
    (net of expenses)................................. (10)%  (5)%   0 %   5%  10%
   Corresponding Common Stock Return.................. (19)% (11)%  (2)%   6%  14%
</TABLE>
 
  Leveraging of the Common Stock cannot be fully achieved until preferred
stock is issued and the proceeds of the offering of preferred stock have been
invested in long-term Municipal Bonds.
 
PORTFOLIO MANAGEMENT AND OTHER CONSIDERATIONS
 
  In the event of an increase in short-term or medium-term rates or other
change in market conditions to the point where the Fund's leverage could
adversely affect holders of Common Stock as noted above, or in anticipation of
such changes, the Fund may attempt to shorten the average maturity of its
investment portfolio, which would tend to offset the negative impact of
leverage on holders of Common Stock. The Fund also may attempt to reduce the
degree to which it is leveraged by redeeming preferred stock pursuant to the
provisions of the Fund's Articles Supplementary establishing the rights and
preferences of the preferred stock or otherwise purchasing shares of preferred
stock. Purchases and redemptions of preferred stock, whether on the open
market or in negotiated transactions, are subject to limitations under the
1940 Act. In determining whether or not it is in the best interest of the Fund
and its stockholders to redeem outstanding preferred stock, the Board of
Directors will take into account a variety of factors including market
conditions, the ratio of preferred stock to Common Stock and the expenses
associated with such redemption. If market conditions subsequently change, the
Fund may sell previously unissued shares of preferred stock or shares of
preferred stock that the Fund previously issued but later repurchased or
redeemed.
 
  The Fund intends to apply for ratings of the preferred stock from one or
more NRSROs. In order to obtain these ratings, the Fund may be required to
maintain portfolio holdings meeting specified guidelines of such
organizations. These guidelines may impose asset coverage requirements that
are more stringent than those imposed by the 1940 Act. It is not anticipated
that these guidelines will impede the Investment Adviser from managing the
Fund's portfolio in accordance with the Fund's investment objective and
policies. Ratings on preferred stock issued by the Fund should not be confused
with ratings on obligations held by the Fund.
 
                                      22
<PAGE>
 
  Under the 1940 Act, the Fund is not permitted to issue shares of preferred
stock unless immediately after such issuance the net asset value of the Fund's
portfolio is at least 200% of the liquidation value of the outstanding
preferred stock (expected to equal the original purchase price of the
outstanding shares of preferred stock plus any accumulated and unpaid
dividends thereon and any accumulated and unpaid Additional Distribution). In
addition, the Fund is not permitted to declare any cash dividend or other
distribution on its Common Stock unless, at the time of such declaration, the
net asset value of the Fund's portfolio (determined after deducting the amount
of such dividend or distribution) is at least 200% of such liquidation value.
Under the Fund's proposed capital structure, assuming the sale of shares of
preferred stock representing approximately 40% of the Fund's capital, the net
asset value of the Fund's portfolio is expected to be approximately 250% of
the liquidation value of the Fund's preferred stock. To the extent possible,
the Fund intends to purchase or redeem shares of preferred stock from time to
time to maintain coverage of preferred stock of at least 200%.
 
                            INVESTMENT RESTRICTIONS
 
  The following are fundamental investment restrictions of the Fund and, prior
to issuance of the preferred stock, may not be changed without the approval of
the holders of a majority of the Fund's outstanding shares of Common Stock
(which for this purpose and under the 1940 Act means the lesser of (i) 67% of
the shares of Common Stock represented at a meeting at which more than 50% of
the outstanding shares of Common Stock are represented or (ii) more than 50%
of the outstanding shares). Subsequent to the issuance of the preferred stock,
the following investment restrictions may not be changed without the approval
of a majority of the outstanding shares of Common Stock and of the outstanding
shares of preferred stock, voting together as a class, and the approval of a
majority of the outstanding shares of preferred stock, voting separately as a
class. The Fund may not:
 
    1. Make investments for the purpose of exercising control or management.
 
    2. Purchase or sell real estate, commodities or commodity contracts;
  provided that the Fund may invest in securities secured by real estate or
  interests therein or issued by entities that invest in real estate or
  interest therein, and the Fund may purchase and sell financial futures
  contracts and options thereon.
 
    3. Issue senior securities or borrow money except as permitted by Section
  18 of the 1940 Act.
 
    4. Underwrite securities of other issuers except insofar as the Fund may
  be deemed an underwriter under the Securities Act of 1933, as amended, in
  selling portfolio securities.
 
    5. Make loans to other persons, except that the Fund may purchase
  Municipal Bonds and other debt securities and enter into repurchase
  agreements in accordance with its investment objective, policies and
  limitations.
 
    6. Invest more than 25% of its total assets (taken at market value at the
  time of each investment) in securities of issuers in a single industry;
  provided that, for purposes of this restriction, states, municipalities and
  their political subdivisions are not considered to be part of any industry.
 
    Additional investment restrictions adopted by the Fund, which may be
  changed by the Board of Directors without shareholder approval, provide
  that the Fund may not:
 
    a. Purchase securities of other investment companies, except to the
  extent that such purchases are permitted by applicable law. Applicable law
  currently prohibits the Fund from purchasing the securities of
 
                                      23
<PAGE>
 
  other investment companies except if immediately thereafter not more than
  (i) 3% of the total outstanding voting stock of such company is owned by
  the Fund, (ii) 5% of the Fund's total assets, taken at market value, would
  be invested in any one such company, (iii) 10% of the Fund's total assets,
  taken at market value, would be invested in such securities, and (iv) the
  Fund, together with other investment companies having the same investment
  adviser and companies controlled by such companies, owns not more than 10%
  of the total outstanding stock of any one closed-end investment company.
 
    b. Mortgage, pledge, hypothecate or in any manner transfer, as security
  for indebtedness, any securities owned or held by the Fund except as may be
  necessary in connection with borrowings mentioned in investment restriction
  (3) above or except as may be necessary in connection with transactions in
  financial futures contracts and options thereon.
 
    c. Purchase any securities on margin, except that the Fund may obtain
  such short-term credit as may be necessary for the clearance of purchases
  and sales of portfolio securities (the deposit or payment by the Fund of
  initial or variation margin in connection with financial futures contracts
  and options thereon is not considered the purchase of a security on
  margin).
 
    d. Make short sales of securities or maintain a short position or invest
  in put, call, straddle or spread options, except that the Fund may write,
  purchase and sell options and futures on Municipal Bonds, U.S. Government
  obligations and related indices or otherwise in connection with bona fide
  hedging activities and may purchase and sell Call Rights to require
  mandatory tender for the purchase of related Municipal Bonds.
 
  If a percentage restriction on investment policies or the investment or use
of assets set forth above is adhered to at the time a transaction is effected,
later changes in percentages resulting from changing values will not be
considered a violation.
 
  The Investment Adviser of the Fund and Merrill Lynch are owned and
controlled by ML & Co. Because of the affiliation of Merrill Lynch with the
Investment Adviser, the Fund is prohibited from engaging in certain
transactions involving Merrill Lynch except pursuant to an exemptive order or
otherwise in compliance with the provisions of the 1940 Act and the rules and
regulations thereunder. Included among such restricted transactions will be
purchases from or sales to Merrill Lynch of securities in transactions in
which it acts as principal. An exemptive order has been obtained that permits
the Fund to effect principal transactions with Merrill Lynch in high quality,
short-term, tax-exempt securities subject to conditions set forth in such
order. The Fund may consider in the future requesting an order permitting
other principal transactions with Merrill Lynch, but there can be no assurance
that such application will be made and, if made, that such order would be
granted.
 
                            DIRECTORS AND OFFICERS
 
  Information about the Directors, executive officers and the portfolio
manager of the Fund, including their ages and their principal occupations
during the last five years is set forth below. Unless otherwise noted, the
address of each Director, executive officer and the portfolio manager is 800
Scudders Mill Road, Plainsboro, New Jersey 08536.
 
  Arthur Zeikel (65)--President and Director (1)(2)--Chairman of the
Investment Adviser and MLAM (which terms, as used herein, include their
corporate predecessors) since 1997; President of the Investment Adviser and
MLAM from 1977 to 1997; Chairman of Princeton Services, Inc. ("Princeton
Services") since 1997, Director since 1993 and President from 1993 to 1997;
Executive Vice President of ML & Co. since 1990.
 
 
                                      24
<PAGE>
 
  Ronald W. Forbes (57)--Director (2)--1400 Washington Avenue, Albany, New
York 12222. Professor of Finance, School of Business, State University of New
York at Albany since 1989.
 
  Cynthia A. Montgomery (45)--Director (2)--Harvard Business School, Soldiers
Field Road, Boston, Massachusetts 02163. Professor, Harvard Business School
since 1989; Associate Professor, J.L. Kellogg Graduate School of Management,
Northwestern University from 1985 to 1989; Assistant Professor, Graduate
School of Business Administration, The University of Michigan from 1979 to
1985; Director, UNUM Corporation since 1990 and Director of Newell Co. since
1995.
 
  Charles C. Reilly (66)--Director (2)--9 Hampton Harbor Road, Hampton Bays,
New York 11946. Self-employed financial consultant since 1990; President and
Chief Investment Officer of Verus Capital, Inc. from 1979 to 1990; Senior Vice
President of Arnhold and S. Bleichroeder, Inc. from 1973 to 1990; Adjunct
Professor, Columbia University Graduate School of Business from 1990 to 1991;
Adjunct Professor, Wharton School, The University of Pennsylvania, from 1989
to 1990; Partner, Small Cities Cable Television since 1986.
 
  Kevin A. Ryan (65)--Director (2)--127 Commonwealth Avenue, Chestnut Hill,
Massachusetts 02167. Founder and current Director of The Boston University
Center for the Advancement of Ethics and Character; Professor of Education at
Boston University since 1982; formerly taught on the faculties of The
University of Chicago, Stanford University and Ohio State University.
 
  Richard R. West (60)--Director (2)--Box 604, Genoa, Nevada 89411. Professor
of Finance since 1984, and Dean from 1984 to 1993, and currently Dean Emeritus
of New York University, Leonard N. Stern School of Business Administration;
Director of Bowne & Co., Inc. (financial printers), Vornado, Inc. (real estate
holding company) and Alexander's Inc. (real estate company).
 
  Terry K. Glenn (57)--Executive Vice President (1)(2)--Executive Vice
President of the Investment Adviser and MLAM since 1983; Executive Vice
President and Director of Princeton Services since 1993; President of Merrill
Lynch Funds Distributor, Inc. ("MLFD") since 1986 and Director thereof since
1991; President of Princeton Administrators, L.P. since 1988.
 
  Vincent R. Giordano (53)--Senior Vice President (1)(2)--Senior Vice
President of the Investment Adviser and MLAM since 1984; Senior Vice President
of Princeton Services since 1993.
 
  Donald C. Burke (37)--Vice President (1)(2)--First Vice President of MLAM
since 1997; Vice President of MLAM from 1990 to 1997; Director of Taxation of
MLAM since 1990.
 
  Kenneth A. Jacob (47)--Vice President (1)(2)--First Vice President of MLAM
since 1997; Vice President of MLAM from 1984 to 1997.
   
  William R. Bock (62)--Vice President and Portfolio Manager (1)(2)--Vice
President of MLAM since 1989.     
 
  Gerald M. Richard (48)--Treasurer (1)(2)--Senior Vice President and
Treasurer of the Investment Adviser and MLAM since 1984; Senior Vice President
and Treasurer of Princeton Services since 1993; Vice President of MLFD since
1981 and Treasurer since 1984.
 
  Patrick D. Sweeney (43)--Secretary (1)(2)--First Vice President of MLAM
since 1997; Vice President of MLAM from 1990 to 1997.
- --------
(1) Interested person, as defined in the 1940 Act, of the Fund.
(2) Such Director or officer is a director, trustee or officer of one or more
    additional investment companies for which the Investment Adviser or its
    affiliate, MLAM, acts as investment adviser or manager.
 
                                      25
<PAGE>
 
  In the event that the Fund issues preferred stock, in connection with the
election of the Fund's Directors, holders of shares of preferred stock, voting
as a separate class, will be entitled to elect two of the Fund's Directors,
and the remaining Directors will be elected by all holders of capital stock,
voting as a single class. See "Description of Capital Stock."
 
COMPENSATION OF DIRECTORS
 
  The Fund pays each Director not affiliated with the Investment Adviser an
annual fee of $2,000 per year plus $400 per meeting attended, together with
such Director's actual out-of-pocket expenses relating to attendance at
meetings. The Fund also pays members of its Audit Committee, which consists of
all of the Directors not affiliated with the Investment Adviser, an annual fee
of $900. The Chairman of the Audit Committee receives an additional fee of
$1,000 per year.
 
  The following table sets forth compensation to be paid by the Fund to the
non-affiliated Directors projected through the end of the Fund's first full
fiscal year and for the calendar year ended December 31, 1997 the aggregate
compensation paid by all investment companies advised by the Investment
Adviser and its affiliate, MLAM ("FAM/MLAM Advised Funds"), to the non-
affiliated Directors.
 
<TABLE>
<CAPTION>
                                                              TOTAL COMPENSATION
                                              PENSION OR        FROM FUND AND
                              AGGREGATE   RETIREMENT BENEFITS  FAM/MLAM ADVISED
                             COMPENSATION ACCRUED AS PART OF      FUNDS PAID
NAME OF DIRECTOR              FROM FUND      FUND EXPENSE        TO DIRECTORS
- ----------------             ------------ ------------------- ------------------
<S>                          <C>          <C>                 <C>
Ronald W. Forbes(1).........    $4,500           None              $153,500
Cynthia A. Montgomery(1)....    $4,500           None              $153,500
Charles C. Reilly(1)........    $5,500           None              $313,000
Kevin A. Ryan(1)............    $4,500           None              $153,500
Richard R. West(1)..........    $4,500           None              $299,000
</TABLE>
- --------
   
(1) The Directors serve on the boards of other FAM/MLAM Advised Funds as
  follows: Mr. Forbes (27 registered investment companies consisting of 40
  portfolios); Ms. Montgomery (27 registered investment companies consisting
  of 40 portfolios); Mr. Reilly (45 registered investment companies consisting
  of 58 portfolios); Mr. Ryan (27 registered investment companies consisting
  of 40 portfolios); and Mr. West (46 registered investment companies
  consisting of 68 portfolios).     
 
                INVESTMENT ADVISORY AND MANAGEMENT ARRANGEMENTS
   
  The Investment Adviser is an affiliate of MLAM and is owned and controlled
by ML & Co., a financial services holding company. The Investment Adviser will
provide the Fund with investment advisory and management services. The Asset
Management Group of ML & Co. (which includes the Investment Adviser) acts as
the investment adviser for over 100 registered investment companies and offers
portfolio management services to individual and institutional accounts. As of
March 1998, the Asset Management Group had a total of approximately $488
billion in investment company and other portfolio assets under management
(approximately $37 billion of which were invested in municipal securities).
This amount includes assets managed for certain affiliates of the Investment
Adviser. The principal business address of the Investment Adviser is 800
Scudders Mill Road, Plainsboro, New Jersey 08536.     
 
                                      26
<PAGE>
 
  The Investment Advisory Agreement with the Investment Adviser (the
"Investment Advisory Agreement") provides that, subject to the supervision of
the Board of Directors of the Fund, the Investment Adviser is responsible for
the actual management of the Fund's portfolio. The responsibility for making
decisions to buy, sell or hold a particular security rests with the Investment
Adviser, subject to review by the Board of Directors. The Fund's portfolio
manager will consider analyses from various sources (including brokerage firms
with which the Fund does business), make the necessary investment decisions,
and place orders for transactions accordingly. The Investment Adviser will
also be responsible for the performance of certain administrative and
management services for the Fund. William R. Bock is the portfolio manager for
the Fund and is primarily responsible for the Fund's day-to-day management.
 
  For the services provided by the Investment Adviser under the Investment
Advisory Agreement, the Fund will pay a monthly fee at an annual rate of 0.55
of 1% of the Fund's average weekly net assets (i.e., the average weekly value
of the total assets of the Fund, including proceeds from the issuance of
shares of preferred stock, minus the sum of accrued liabilities of the Fund
and accumulated dividends on the shares of preferred stock). For purposes of
this calculation, average weekly net assets are determined at the end of each
month on the basis of the average net assets of the Fund for each week during
the month. The assets for each weekly period are determined by averaging the
net assets at the last business day of a week with the net assets at the last
business day of the prior week.
 
  The Investment Advisory Agreement obligates the Investment Adviser to
provide investment advisory services and to pay all compensation of and
furnish office space for officers and employees of the Fund connected with
investment and economic research, trading and investment management of the
Fund, as well as the compensation of all Directors of the Fund who are
affiliated persons of the Investment Adviser or any of its affiliates. The
Fund pays all other expenses incurred in the operation of the Fund, including,
among other things, expenses for legal and auditing services, taxes, costs of
printing proxies, listing fees, stock certificates and shareholder reports,
charges of the custodian and the transfer and dividend disbursing agent and
registrar, fees and expenses with respect to the issuance of preferred stock,
Securities and Exchange Commission fees, fees and expenses of unaffiliated
Directors, accounting and pricing costs, insurance, interest, brokerage costs,
litigation and other extraordinary or non-recurring expenses, mailing and
other expenses properly payable by the Fund. Accounting services are provided
to the Fund by the Investment Adviser, and the Fund reimburses the Investment
Adviser for its costs in connection with such services.
 
  Unless earlier terminated as described below, the Investment Advisory
Agreement will remain in effect for a period of two years from the date of
execution and will remain in effect from year to year thereafter if approved
annually (a) by the Board of Directors of the Fund or by a majority of the
outstanding shares of the Fund and (b) by a majority of the Directors who are
not parties to such contract or interested persons (as defined in the 1940
Act) of any such party. Such contract is not assignable and may be terminated
without penalty on 60 days' written notice at the option of either party
thereto or by the vote of the shareholders of the Fund.
 
  Securities held by the Fund may also be held by, or be appropriate
investments for, other funds or investment advisory clients for which the
Investment Adviser or its affiliates act as an adviser. Because of different
objectives or other factors, a particular security may be bought for one or
more clients when one or more clients are selling the same security. If
purchases or sales of securities by the Investment Adviser for the Fund or
other funds for which it acts as investment adviser or for other advisory
clients arise for consideration at or about the same time, transactions in
such securities will be made, insofar as feasible, for the respective funds
and clients in a manner deemed equitable to all. To the extent that
transactions on behalf of more than one client
 
                                      27
<PAGE>
 
of the Investment Adviser or its affiliates during the same period may
increase the demand for securities being purchased or the supply of securities
being sold, there may be an adverse effect on price.
 
CODE OF ETHICS
 
  The Board of Directors of the Fund has adopted a Code of Ethics pursuant to
Rule 17j-1 under the 1940 Act that incorporates the Code of Ethics of the
Investment Adviser (together, the "Codes"). The Codes significantly restrict
the personal investing activities of all employees of the Investment Adviser
and, as described below, impose additional, more onerous, restrictions on Fund
investment personnel.
 
  The Codes require that all employees of the Investment Adviser preclear any
personal securities investment (with limited exceptions, such as U.S.
Government securities). The preclearance requirement and associated procedures
are designed to identify any substantive prohibition or limitation applicable
to the proposed investment. The substantive restrictions applicable to all
employees of the Investment Adviser include a ban on acquiring any securities
in a "hot" initial public offering and a prohibition from profiting on short-
term trading securities. In addition, no employee may purchase or sell any
security that at the time is being purchased or sold (as the case may be), or
to the knowledge of the employee is being considered for purchase or sale, by
any fund advised by the Investment Adviser. Furthermore, the Codes provide for
trading "blackout periods" that prohibit trading by investment personnel of
the Fund within periods of trading by the Fund in the same (or equivalent)
security (15 or 30 days depending upon the transaction).
 
                            PORTFOLIO TRANSACTIONS
 
  Subject to policies established by the Board of Directors of the Fund, the
Investment Adviser is primarily responsible for the execution of the Fund's
portfolio transactions. In executing such transactions, the Investment Adviser
seeks to obtain the best results for the Fund, taking into account such
factors as price (including the applicable brokerage commission or dealer
spread), size of order, difficulty of execution and operational facilities of
the firm involved and the firm's risk in positioning a block of securities.
While the Investment Adviser generally seeks reasonably competitive commission
rates, the Fund does not necessarily pay the lowest commission or spread
available.
 
  The Fund has no obligation to deal with any broker or dealer in the
execution of transactions in portfolio securities. Subject to obtaining the
best price and execution, securities firms that provided supplemental
investment research to the Investment Adviser, including Merrill Lynch, may
receive orders for transactions by the Fund. Information so received will be
in addition to and not in lieu of the services required to be performed by the
Investment Adviser under the Investment Advisory Agreement, and the expenses
of the Investment Adviser will not necessarily be reduced as a result of the
receipt of such supplemental information.
 
  The securities in which the Fund primarily will invest are traded in the
over-the-counter markets, and the Fund intends to deal directly with the
dealers who make markets in the securities involved, except in those
circumstances where better prices and execution are available elsewhere. Under
the 1940 Act, except as permitted by exemptive order, persons affiliated with
the Fund are prohibited from dealing with the Fund as principal in the
purchase and sale of securities. Since transactions in the over-the-counter
market usually involve transactions with dealers acting as principal for their
own account, the Fund will not deal with affiliated persons, including Merrill
Lynch and its affiliates, in connection with such transactions except that,
pursuant to an
 
                                      28
<PAGE>
 
exemptive order obtained by the Investment Adviser, the Fund may engage in
principal transactions with Merrill Lynch in high quality, short-term, tax-
exempt securities. See "Investment Restrictions." An affiliated person of the
Fund may serve as its broker in over-the-counter transactions conducted on an
agency basis.
 
  The Fund may also purchase tax-exempt debt instruments in individually
negotiated transactions with the issuers. Because an active trading market may
not exist for such securities, the prices that the Fund may pay for these
securities or receive on their resale may be lower than that for similar
securities with a more liquid market.
 
PORTFOLIO TURNOVER
 
  Generally, the Fund does not purchase securities for short-term trading
profits. However, the Fund may dispose of securities without regard to the
time they have been held when such action, for defensive or other reasons
appears advisable to the Investment Adviser. While it is not possible to
predict turnover rates with any certainty, at present it is anticipated that
the Fund's annual portfolio turnover rate, under normal circumstances after
the Fund's portfolio is invested in accordance with its investment objective,
will be less than 100%. The portfolio turnover rate is calculated by dividing
the lesser of purchases or sales of portfolio securities for the particular
fiscal year by the monthly average of the value of the portfolio securities
owned by the Fund during the particular fiscal year. For purposes of
determining this rate, all securities whose maturities at the time of
acquisition are one year or less are excluded.
 
                          DIVIDENDS AND DISTRIBUTIONS
 
  The Fund intends to distribute all its net investment income. Dividends from
such net investment income will be declared and paid monthly to holders of
Common Stock. It is expected that the Fund will commence paying dividends to
holders of Common Stock within approximately 90 days of the date of this
Prospectus. From and after issuance of the preferred stock, monthly
distributions to holders of Common Stock normally will consist of
substantially all net investment income remaining after the payment of
dividends (and any Additional Distribution) on the preferred stock. All net
realized capital gains (including new categories of capital gains, discussed
below under "Taxes"), if any, will be distributed pro rata at least annually
to holders of Common Stock and any preferred stock. While any shares of
preferred stock are outstanding, the Fund may not declare any cash dividend or
other distribution on its Common Stock, unless at the time of such
declaration, (i) all accumulated preferred stock dividends, including any
Additional Distribution, have been paid, and (ii) the net asset value of the
Fund's portfolio (determined after deducting the amount of such dividend or
other distribution) is at least 200% of the liquidation value of the
outstanding preferred stock (expected to equal the original purchase price of
the outstanding shares of preferred stock plus any accumulated and unpaid
dividends thereon and any accumulated but unpaid Additional Distribution). If
the Fund's ability to make distributions on its Common Stock is limited, such
limitation could under certain circumstances impair the ability of the Fund to
maintain its qualification for taxation as a regulated investment company,
which would have adverse tax consequences for holders of Common Stock. See
"Taxes."
 
  See "Automatic Dividend Reinvestment Plan" for information concerning the
manner in which dividends and distributions to holders of Common Stock may be
automatically reinvested in shares of Common Stock of the Fund. Dividends and
distributions may be taxable to shareholders under certain circumstances as
discussed below, whether they are reinvested in shares of the Fund or received
in cash.
 
                                      29
<PAGE>
 
                                     TAXES
 
GENERAL
 
  The Fund intends to elect and to qualify for the special tax treatment
afforded regulated investment companies ("RICs") under the Code. As long as it
so qualifies, in any taxable year in which it distributes at least 90% of its
taxable net income and 90% of its tax-exempt net income (see below), the Fund
(but not its shareholders) will not be subject to Federal income tax to the
extent that it distributes its net investment income and net realized capital
gains. The Fund intends to distribute substantially all of such income.
 
  The Code requires a RIC to pay a nondeductible 4% excise tax to the extent
the RIC does not distribute, during each calendar year, 98% of its ordinary
income, determined on a calendar year basis, and 98% of its capital gains,
determined, in general, on an October 31 year-end, plus certain undistributed
amounts from previous years. The required distributions, however, are based
only on the taxable income of a RIC. The excise tax, therefore, generally will
not apply to the tax-exempt income of a RIC, such as the Fund, that pays
exempt-interest dividends.
 
  The Fund intends to qualify to pay "exempt-interest dividends" as defined in
Section 852(b)(5) of the Code. Under such section if, at the close of each
quarter of its taxable year, at least 50% of the value of its total assets
consists of obligations exempt from Federal income tax ("tax-exempt
obligations") under Section 103(a) of the Code (relating generally to
obligations of a state or local governmental unit), the Fund shall be
qualified to pay exempt-interest dividends to its shareholders. Exempt-
interest dividends are dividends or any part thereof paid by the Fund that are
attributable to interest on tax-exempt obligations and designated by the Fund
as exempt-interest dividends in a written notice mailed to the Fund's
shareholders within 60 days after the close of its taxable year. To the extent
that the dividends distributed to the Fund's shareholders are derived from
interest income exempt from tax under Code Section 103(a) and are properly
designated as exempt-interest dividends, they will be excludable from a
shareholder's gross income for Federal income tax purposes. Exempt-interest
dividends are included, however, in determining the portion, if any, of a
person's social security and railroad retirement benefits subject to Federal
income taxes. Interest on indebtedness incurred or continued to purchase or
carry Fund shares is not deductible for Federal income tax purposes to the
extent attributable to exempt-interest dividends. Each shareholder is advised
to consult a tax adviser with respect to whether exempt-interest dividends
retain the exclusion under Code Section 103(a) if such shareholder would be
treated as a "substantial user" or "related person" under Code Section 147(a)
with respect to property financed with the proceeds of an issue of "industrial
development bonds" or "private activity bonds," if any, held by the Fund.
 
  To the extent that the Fund's distributions are derived from interest on its
taxable investments or from an excess of net short-term capital gains over net
long-term capital losses ("ordinary income dividends"), such distributions
will be considered taxable ordinary income for Federal income tax purposes.
Distributions, if any, from an excess of net long-term capital gains over net
short-term capital losses derived from the sale of securities or from certain
transactions in futures or options ("capital gain dividends") are taxable as
long-term capital gains for Federal income tax purposes, regardless of the
length of time the shareholder has owned Fund shares. Recent legislation
creates additional categories of capital gains taxable at different rates.
Generally not later than 60 days after the close of its taxable year, the Fund
will provide its shareholders with a written notice designating the amounts of
any exempt-interest dividends, ordinary income dividends or capital gain
dividends, as well as the amount of capital gain dividends in the different
categories of capital gain referred to above. Distributions by the
 
                                      30
<PAGE>
 
Fund, whether from exempt-income, ordinary income or capital gains, will not
be eligible for the dividends received deduction allowed to corporations under
the Code.
 
  All or a portion of the Fund's gain from the sale or redemption of tax-
exempt obligations purchased at a market discount will be treated as ordinary
income rather than capital gain. This rule may increase the amount of ordinary
income dividends received by shareholders. Distributions in excess of the
Fund's earnings and profits will first reduce the adjusted tax basis of a
holder's shares and, after such adjusted tax basis is reduced to zero, will
constitute capital gains to such holder (assuming the shares are held as a
capital asset). Any loss upon the sale or exchange of Fund shares held for six
months or less will be disallowed to the extent of any exempt-interest
dividends received by the shareholder. In addition, any such loss that is not
disallowed under the rule stated above will be treated as long-term capital
loss to the extent of any capital gain dividends received by the shareholder.
If the Fund pays a dividend in January that was declared in the previous
October, November or December to shareholders of record on a specified date in
one of such months, then such dividend will be treated for tax purposes as
being paid by the Fund and received by its shareholders on December 31 of the
year in which such dividend was declared.
   
  The Internal Revenue Service (the "Service") has taken the position in a
revenue ruling that if a RIC has more than one class of shares, it may
designate distributions made to each class in any year as consisting of no
more than such class's proportionate share of particular types of income,
including exempt-interest income and net long-term capital gains (including
the additional categories of capital gains discussed above). A class's
proportionate share of a particular type of income is determined according to
the percentage of total dividends paid by the RIC during such year that was
paid to such class. Consequently, when both Common Stock and preferred stock
are outstanding, the Fund intends to designate distributions made to the
classes as consisting of particular types of income in accordance with the
classes' proportionate shares of such income. Thus, the Fund will designate
dividends paid as exempt-interest dividends in a manner that allocates such
dividends among the holders of Common Stock and preferred stock in proportion
to the total dividends paid to each class during the taxable year, or
otherwise as required by applicable law. Capital gain dividends (including the
additional categories of capital gains discussed above) will similarly be
allocated among the classes in proportion to the total dividends paid to each
class during the taxable year, or otherwise as required by applicable law.
When capital gain or other taxable income is allocated to holders of preferred
stock pursuant to the allocation rules described above, the terms of the
preferred stock may require the Fund to make an additional distribution to or
otherwise compensate such holders for the tax liability resulting from such
allocation.     
 
  The Code subjects interest received on certain otherwise tax-exempt
securities to an alternative minimum tax. The alternative minimum tax will
apply to interest received on certain "private activity bonds" issued after
August 7, 1986. Private activity bonds are bonds that, although tax-exempt,
are used for purposes other than those generally performed by governmental
units and that benefit non-governmental entities (e.g., bonds used for
industrial development or housing purposes). Income received on such bonds is
classified as an item of "tax preference" that could subject certain investors
in such bonds, including shareholders of the Fund, to an increased alternative
minimum tax. The Fund intends to purchase such "private activity bonds" and
will report to shareholders within 60 days after its taxable year-end the
portion of its dividends declared during the year that constitutes an item of
tax preference for alternative minimum tax purposes. The Code further provides
that corporations are subject to an alternative minimum tax based, in part, on
certain differences between taxable income as adjusted for other tax
preferences and the corporation's "adjusted current earnings," which more
closely reflect a corporation's economic income. Because an exempt-interest
dividend paid by the Fund will be
 
                                      31
<PAGE>
 
included in adjusted current earnings, a corporate shareholder may be required
to pay an alternative minimum tax on exempt-interest dividends paid by the
Fund.
 
  The Fund may invest in instruments the return on which includes
nontraditional features such as indexed principal or interest payments
("nontraditional instruments"). These instruments may be subject to special
tax rules under which the Fund may be required to accrue and distribute income
before amounts due under the obligations are paid. In addition, it is possible
that all or a portion of the interest payments on nontraditional instruments
could be recharacterized as taxable ordinary income.
 
  If at any time when shares of preferred stock are outstanding the Fund does
not meet the asset coverage requirements of the 1940 Act, the Fund will be
required to suspend distributions to holders of Common Stock until the asset
coverage is restored. See "Dividends and Distributions." This may prevent the
Fund from distributing at least 90% of its net investment income and may,
therefore, jeopardize the Fund's qualification for taxation as a RIC. Upon any
failure to meet the asset coverage requirements of the 1940 Act, the Fund, in
its sole discretion, may redeem shares of preferred stock in order to maintain
or restore the requisite asset coverage and avoid the adverse consequences to
the Fund and its shareholders of failing to qualify as a RIC. There can be no
assurance, however, that any such action would achieve such objectives.
 
  As noted above, the Fund must distribute annually at least 90% of its net
taxable and tax-exempt interest income. A distribution will only be counted
for this purpose if it qualifies for the dividends paid deduction under the
Code. Some types of preferred stock that the Fund currently contemplates
issuing may raise an issue as to whether distributions on such preferred stock
are "preferential" under the Code and, therefore, not eligible for the
dividends paid deduction. The Fund intends to issue preferred stock that
counsel advises will not result in the payment of a preferential dividend and
may seek a private letter ruling from the Service to that effect. If the Fund
ultimately relies solely on a legal opinion when it issues such preferred
stock, there is no assurance that the Service would agree that dividends on
the preferred stock are not preferential. If the Service successfully
disallowed the dividends paid deduction for dividends on the preferred stock,
the Fund could be disqualified as a RIC. In this case, dividends on the Common
Stock would not be exempt from Federal income taxes. Additionally, the Fund
would be subject to the alternative minimum tax.
 
  The value of shares acquired pursuant to the Fund's dividend reinvestment
plan will generally be excluded from gross income to the extent that the cash
amount reinvested would be excluded from gross income. If, when the Fund's
shares are trading at a premium over net asset value, the Fund issues shares
pursuant to the dividend reinvestment plan that have a greater fair market
value than the amount of cash reinvested, it is possible that all or a portion
of such discount (which may not exceed 5% of the fair market value of the
Fund's shares) could be viewed as a taxable distribution. If the discount is
viewed as a taxable distribution, it is also possible that the taxable
character of this discount would be allocable to all the shareholders,
including shareholders who do not participate in the dividend reinvestment
plan. Thus, shareholders who do not participate in the dividend reinvestment
plan might be required to report as ordinary income a portion of their
distributions equal to their allocable share of the discount.
 
  Under certain Code provisions, some taxpayers may be subject to 31%
withholding tax on certain ordinary income dividends and on capital gain
dividends and redemption payments ("backup withholding"). Generally,
shareholders subject to backup withholding will be those for whom no certified
taxpayer identification number is on file with the Fund or who, to the Fund's
knowledge, have furnished an incorrect number. When establishing
 
                                      32
<PAGE>
 
an account, an investor must certify under penalty of perjury that such number
is correct and that such investor is not otherwise subject to backup
withholding.
 
  The Code provides that every shareholder required to file a tax return must
include for information purposes on such return the amount of exempt-interest
dividends received from all sources (including the Fund) during the taxable
year.
 
TAX TREATMENT OF OPTIONS AND FUTURES TRANSACTIONS
 
  The Fund may purchase or sell municipal bond index financial futures
contracts and interest rate financial futures contracts on U.S. Government
securities. The Fund may also purchase and write call and put options on such
financial futures contracts. In general, unless an election is available to
the Fund or an exception applies, such options and financial futures contracts
that are "Section 1256 contracts" will be "marked to market" for Federal
income tax purposes at the end of each taxable year, i.e., each such option or
financial futures contract will be treated as sold for its fair market value
on the last day of the taxable year, and any gain or loss attributable to
Section 1256 contracts will be 60% long-term and 40% short-term capital gain
or loss. Application of these rules to Section 1256 contracts held by the Fund
may alter the timing and character of distributions to shareholders. The mark-
to-market rules outlined above, however, will not apply to certain
transactions entered into by the Fund solely to reduce the risk of changes in
price or interest rates with respect to its investments.
 
  Code Section 1092, which applies to certain "straddles," may affect the
taxation of the Fund's sales of securities and transactions in financial
futures contracts and related options. Under Section 1092, the Fund may be
required to postpone recognition for tax purposes of losses incurred in
certain sales of securities and certain closing transactions in financial
futures contracts or the related options.
 
STATE AND LOCAL TAXES
 
  The exemption from Federal income tax for exempt-interest dividends does not
necessarily result in an exemption for such dividends under the income or
other tax laws of any state or other tax laws or local taxing authority.
Shareholders are advised to consult their own tax advisers concerning state
and local tax matters.
 
                               ----------------
 
  The foregoing is a general and abbreviated summary of the applicable
provisions of the Code and Treasury Regulations presently in effect. For the
complete provisions, reference should be made to the pertinent Code sections
and the Treasury Regulations promulgated thereunder. The Code and the Treasury
Regulations are subject to change by legislative, judicial or administrative
action either prospectively or retroactively.
 
  Shareholders are urged to consult their tax advisers regarding specific
questions as to Federal, state, local or foreign taxes.
 
                     AUTOMATIC DIVIDEND REINVESTMENT PLAN
 
  Pursuant to the Fund's Automatic Dividend Reinvestment Plan (the "Plan"),
unless a holder of Common Stock otherwise elects, all dividend and capital
gains distributions will be automatically reinvested by The Bank of New York,
as agent for shareholders in administering the Plan (the "Plan Agent"), in
additional shares of
 
                                      33
<PAGE>
 
Common Stock of the Fund. Holders of Common Stock who elect not to participate
in the Plan will receive all distributions in cash paid by check mailed
directly to the shareholder of record (or, if the shares are held in street or
other nominee name, then to such nominee) by The Bank of New York, as dividend
paying agent. Such participants may elect not to participate in the Plan and
to receive all distributions of dividends and capital gains in cash by sending
written instructions to The Bank of New York, as dividend paying agent, at the
address set forth below. The Fund is not responsible for any failure of
delivery to the shareholder's address of record and no interest will accrue on
amounts represented by uncashed distribution checks. Participation in the Plan
is completely voluntary and may be terminated or resumed at any time without
penalty by written notice if received by the Plan Agent not less than ten days
prior to any dividend record date; otherwise, such termination or resumption
will be effective with respect to any subsequently declared dividend or
distribution.
 
  Whenever the Fund declares an income dividend or a capital gains
distribution (collectively, referred to as "dividends") payable either in
shares or in cash, non-participants in the Plan will receive cash, and
participants in the Plan will receive the equivalent in shares of Common
Stock. The shares will be acquired by the Plan Agent for the participant's
account, depending upon the circumstances described below, either (i) through
receipt of additional unissued but authorized shares of Common Stock from the
Fund ("newly issued shares") or (ii) by purchase of outstanding shares of
Common Stock on the open market ("open-market purchases") on the New York
Stock Exchange or elsewhere. If on the payment date for the dividend, the net
asset value per share of the Common Stock is equal to or less than the market
price per share of the Common Stock plus estimated brokerage commissions (such
condition being referred to herein as "market premium"), the Plan Agent will
invest the dividend amount in newly issued shares on behalf of the
participant. The number of newly issued shares of Common Stock to be credited
to the participant's account will be determined by dividing the dollar amount
of the dividend by the net asset value per share on the date the shares are
issued, provided that the maximum discount from the then current market price
per share on the date of issuance may not exceed 5%. If on the dividend
payment date the net asset value per share is greater than the market value
(such condition being referred to herein as "market discount"), the Plan Agent
will invest the dividend amount in shares acquired on behalf of the
participant in open-market purchases. Prior to the time the shares of Common
Stock commence trading on the New York Stock Exchange, participants in the
Plan will receive any dividends in newly issued shares.
 
  In the event of a market discount on the dividend payment date, the Plan
Agent will have until the last business day before the next date on which the
shares trade on an "ex-dividend" basis or in no event more than 30 days after
the dividend payment date (the "last purchase date") to invest the dividend
amount in shares acquired in open-market purchases. It is contemplated that
the Fund will pay monthly income dividends. Therefore, the period during which
open-market purchases can be made will exist only from the payment date on the
dividend through the date before the next "ex-dividend" date, which typically
will be approximately ten days. If, before the Plan Agent has completed its
open-market purchases, the market price of a share of Common Stock exceeds the
net asset value per share, the average per share purchase prices paid by the
Plan Agent may exceed the net asset value of the Fund's shares, resulting in
the acquisition of fewer shares than if the dividend had been paid in newly
issued shares on the dividend payment date. Because of the foregoing
difficulty with respect to open-market purchases, the Plan provides that if
the Plan Agent is unable to invest the full dividend amount in open-market
purchases during the purchase period or if the market discount shifts to a
market premium during the purchase period, the Plan Agent will cease making
open-market purchases and will invest the uninvested portion of the dividend
amount in newly issued shares at the close of business on the last purchase
date.
 
                                      34
<PAGE>
 
  The Plan Agent maintains all shareholders' accounts in the Plan and
furnishes written confirmation of all transactions in the account, including
information needed by shareholders for tax records. Shares in the account of
each Plan participant will be held by the Plan Agent in non-certificated form
in the name of the participant and each shareholder's proxy will include those
shares purchased or received pursuant to the Plan. The Plan Agent will forward
all proxy solicitation materials to participants and vote proxies for shares
held pursuant to the Plan in accordance with the instructions of the
participants.
 
  In the case of shareholders such as banks, brokers or nominees that hold
shares for others who are the beneficial owners, the Plan Agent will
administer the Plan on the basis of the number of shares certified from time
to time by the record shareholders as representing the total amount registered
in the record shareholder's name and held for the account of beneficial owners
who are to participate in the Plan.
 
  There will be no brokerage charges with respect to shares issued directly by
the Fund as a result of dividends or capital gains distributions payable
either in shares or in cash. However, each participant will pay a pro rata
share of brokerage commissions incurred with respect to the Plan Agent's open-
market purchases in connection with the reinvestment of dividends.
 
  The automatic reinvestment of dividends and distributions will not relieve
participants of any Federal, state or local income tax that may be payable (or
required to be withheld) on such dividends. See "Taxes."
 
  Shareholders participating in the Plan may receive benefits not available to
shareholders not participating in the Plan. If the market price plus
commissions of the Fund's shares is above the net asset value, participants in
the Plan will receive shares of the Fund at less than they could otherwise
purchase them and will have shares with a cash value greater than the value of
any cash distribution they would have received on their shares. If the market
price plus commissions is below the net asset value, participants will receive
distributions in shares with a net asset value greater than the value of any
cash distribution they would have received on their shares. However, there may
be insufficient shares available in the market to make distributions in shares
at prices below the net asset value. Also, since the Fund does not redeem its
shares, the price on resale may be more or less than the net asset value. See
"Taxes" for a discussion of tax consequences of the Plan.
 
  Experience under the Plan may indicate that changes are desirable.
Accordingly, the Fund reserves the right to amend or terminate the Plan. There
is no direct service charge to participants in the Plan; however, the Fund
reserves the right to amend the Plan to include a service charge payable by
the participants.
 
  All correspondence concerning the Plan should be directed to the Plan Agent
at 101 Barclay Street, New York, New York 10286.
 
                         MUTUAL FUND INVESTMENT OPTION
 
  Purchasers of shares of Common Stock of the Fund through Merrill Lynch in
this offering will have an investment option consisting of the right to
reinvest the net proceeds from a sale of such shares (the "Original Shares")
in Class D initial sales charge shares of certain Merrill Lynch-sponsored
open-end mutual funds ("Eligible Class D Shares") at their net asset value,
without the imposition of the initial sales charge, if the conditions set
forth below are satisfied. First, the sale of the Original Shares must be made
through Merrill Lynch, and the net proceeds therefrom must be immediately
reinvested in Eligible Class D Shares. Second, the
 
                                      35
<PAGE>
 
Original Shares must have been either acquired in this offering or be shares
representing reinvested dividends from shares of Common Stock acquired in this
offering. Third, the Original Shares must have been continuously maintained in
a Merrill Lynch securities account. Fourth, there must be a minimum purchase
of $250 to be eligible for the investment option. Class D shares of the mutual
funds are subject to an account maintenance fee at an annual rate of up to
0.25% of the average daily net asset value of such mutual fund. The Eligible
Class D Shares may be redeemed at any time at the next determined net asset
value, subject in certain cases to a redemption fee. Prior to the time the
shares of Common Stock commence trading on the New York Stock Exchange, the
distributor for the mutual funds will advise Merrill Lynch Financial
Consultants as to those mutual funds that offer the investment option
described above.
 
                                NET ASSET VALUE
 
  Net asset value per share of Common Stock is determined as of 15 minutes
after the close of business on the New York Stock Exchange (generally, 4:00
p.m., New York time) on the last business day in each week. For purposes of
determining the net asset value of a share of Common Stock, the value of the
securities held by the Fund plus any cash or other assets (including interest
accrued but not yet received) minus all liabilities (including accrued
expenses) and the aggregate liquidation value of the outstanding shares of
preferred stock is divided by the total number of shares of Common Stock
outstanding at such time. Expenses, including the fees payable to the
Investment Adviser, are accrued daily.
 
  The Municipal Bonds in which the Fund invests are traded primarily in the
over-the-counter markets. In determining net asset value, the Fund utilizes
the valuations of portfolio securities furnished by a pricing service approved
by the Board of Directors. The pricing service typically values portfolio
securities at the bid price or the yield equivalent when quotations are
readily available. Municipal Bonds for which quotations are not readily
available are valued at fair market value on a consistent basis as determined
by the pricing service using a matrix system to determine valuations. The
procedures of the pricing service and its valuations are reviewed by the
officers of the Fund under the general supervision of the Board of Directors.
The Board of Directors has determined in good faith that the use of a pricing
service is a fair method of determining the valuation of portfolio securities.
Positions in futures contracts are valued at closing prices for such contracts
established by the exchange on which they are traded, or if market quotations
are not readily available, are valued at fair value on a consistent basis
using methods determined in good faith by the Board of Directors.
 
  The Fund determines and makes available for publication the net asset value
of its Common Stock weekly. Currently, the net asset values of shares of
publicly traded closed-end investment companies investing in debt securities
are published in Barron's, the Monday edition of The Wall Street Journal, and
the Monday and Saturday editions of The New York Times.
 
                         DESCRIPTION OF CAPITAL STOCK
 
  The Fund is authorized to issue 200,000,000 shares of capital stock, par
value $.10 per share, all of which shares are initially classified as Common
Stock. The Board of Directors is authorized, however, to classify or
reclassify any unissued shares of capital stock by setting or changing the
preferences, conversion or other rights, voting powers, restrictions,
limitations as to dividends, qualifications, or terms or conditions of
redemption. Within approximately three months after completion of the offering
of the Common Stock described herein, the
 
                                      36
<PAGE>
 
Fund intends to reclassify an amount of unissued Common Stock as preferred
stock and at that time to offer shares of preferred stock representing
approximately 40% of the Fund's capital immediately after the issuance of such
preferred stock. There is no assurance that such preferred stock will be
issued.
 
COMMON STOCK
 
  Shares of Common Stock, when issued and outstanding, will be fully paid and
non-assessable. Shareholders are entitled to share pro rata in the net assets
of the Fund available for distribution to shareholders upon liquidation of the
Fund. Shareholders are entitled to one vote for each share held.
 
  So long as any shares of the Fund's preferred stock are outstanding, holders
of Common Stock will not be entitled to receive any net income of or other
distributions from the Fund unless all accumulated dividends on preferred
stock have been paid and unless asset coverage (as defined in the 1940 Act)
with respect to preferred stock would be at least 200% after giving effect to
such distributions. See "Preferred Stock" below.
 
  The Fund will send unaudited reports at least semi-annually and audited
annual financial statements to all of its shareholders.
 
  The Investment Adviser provided the initial capital for the Fund by
purchasing 6,667 shares of Common Stock of the Fund for $100,005. As of the
date of this Prospectus, the Investment Adviser owned 100% of the outstanding
shares of Common Stock of the Fund. The Investment Adviser may be deemed to
control the Fund until such time as it owns less than 25% of the outstanding
shares of the Fund.
 
PREFERRED STOCK
 
  It is anticipated that the Fund's shares of preferred stock will be issued
in one or more series, with rights as determined by the Board of Directors, by
action of the Board of Directors without the approval of the holders of Common
Stock. Under the 1940 Act, the Fund is permitted to have outstanding more than
one series of preferred stock so long as no single series has a priority over
another series as to the distribution of assets of the Fund or the payment of
dividends. Holders of Common Stock have no preemptive right to purchase any
shares of preferred stock that might be issued. It is anticipated that the net
asset value per share of the preferred stock will equal its original purchase
price per share plus accumulated dividends per share.
 
  The Fund's Board of Directors has declared its intention to authorize an
offering of shares of preferred stock (representing approximately 40% of the
Fund's capital immediately after the issuance of such preferred stock) within
approximately three months after completion of the offering of Common Stock,
subject to market conditions and to the Board's continuing to believe that
leveraging the Fund's capital structure through the issuance of preferred
stock is likely to achieve the benefits to the holders of Common Stock
described in the Prospectus. Although the terms of the preferred stock,
including its dividend rate, voting rights, liquidation preference and
redemption provisions will be determined by the Board of Directors (subject to
applicable law and the Fund's Articles of Incorporation), the initial series
of preferred stock will be structured to carry either a relatively short-term
dividend rate, in which case periodic redetermination of the dividend rate
will be made at relatively short intervals (generally seven or 28 days), or a
medium-term dividend rate, in which case periodic redetermination of the
dividend rate will be made at intervals of up to five years. In either case,
such redetermination of the dividend rate will be made through an auction or
remarketing procedure. Additionally, under certain circumstances, when the
Fund is required to allocate taxable income to holders of the preferred
 
                                      37
<PAGE>
 
stock, it is anticipated that the terms of the preferred stock will require
the Fund to make an Additional Distribution (as defined in "Special Leverage
Considerations and Risks--Effects of Leverage") to such holders. The Board
also has indicated that it is likely that the liquidation preference, voting
rights and redemption provisions of the preferred stock will be as stated
below. The Fund's Articles of Incorporation, as amended, together with any
Articles Supplementary, is referred to below as the "Charter."
 
  Liquidation Preference. In the event of any voluntary or involuntary
liquidation, dissolution or winding up of the Fund, the holders of shares of
preferred stock will be entitled to receive a preferential liquidating
distribution (expected to equal the original purchase price per share plus an
amount equal to accumulated and unpaid dividends whether or not earned or
declared and any accumulated and unpaid Additional Distribution) before any
distribution of assets is made to holders of Common Stock. After payment of
the full amount of the liquidating distribution to which they are entitled,
the preferred stockholders 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 any other corporation or corporations or a sale of all or
substantially all of the assets of the Fund will not be deemed to be a
liquidation, dissolution or winding up of the Fund.
 
  Voting Rights. Except as otherwise indicated in this Prospectus and except
as otherwise required by applicable law, holders of shares of preferred stock
will have equal voting rights with holders of shares of Common Stock (one vote
per share) and will vote together with holders of Common Stock as a single
class.
 
  In connection with the election of the Fund's directors, holders of shares
of preferred stock, voting as a separate class, will be entitled to elect two
of the Fund's directors, and the remaining directors will be elected by all
holders of capital stock, voting as a single class. So long as any preferred
stock is outstanding, the Fund will have not less than five directors. If at
any time dividends on shares of the Fund's preferred stock shall be unpaid in
an amount equal to two full years' dividends thereon, the holders of all
outstanding shares of preferred stock, voting as a separate class, will be
entitled to elect a majority of the Fund's directors until all dividends in
default have been paid or declared and set apart for payment.
 
  The affirmative vote of the holders of a majority of the outstanding shares
of the preferred stock, voting as a separate class, will be required to (i)
authorize, create or issue, or increase the authorized or issued amount of,
any class or series of stock ranking prior to or on a parity with any series
of preferred stock with respect to payment of dividends or the distribution of
assets on liquidation, or increase the authorized amount of preferred stock or
(ii) amend, alter or repeal the provisions of the Charter, whether by merger,
consolidation or otherwise, so as to adversely affect any of the contract
rights expressly set forth in the Charter of holders of preferred stock.
 
  Redemption Provisions. It is anticipated that shares of preferred stock will
generally be redeemable at the option of the Fund at a price equal to their
liquidation preference plus accumulated but unpaid dividends to the date of
redemption plus, under certain circumstances, a redemption premium. Shares of
preferred stock will also be subject to mandatory redemption at a price equal
to their liquidation preference plus accumulated but unpaid dividends to the
date of redemption upon the occurrence of certain specified events, such as
the failure of the Fund to maintain asset coverage requirements for the
preferred stock specified by the rating agencies that issue ratings on the
preferred stock.
 
 
                                      38
<PAGE>
 
CERTAIN PROVISIONS OF THE ARTICLES OF INCORPORATION
 
  The Fund's Articles of Incorporation include provisions that could have the
effect of limiting the ability of other entities or persons to acquire control
of the Fund or to change the composition of its Board of Directors and could
have the effect of depriving shareholders of an opportunity to sell their
shares at a premium over prevailing market prices by discouraging a third
party from seeking to obtain control of the Fund. A director may be removed
from office with or without cause, but only by vote of the holders of at least
66 2/3% of the votes entitled to be voted on the matter. A director elected by
all the holders of capital stock may be removed only by action of such
holders, and a director elected by the holders of preferred stock may be
removed only by action of such holders.
 
  In addition, the Articles of Incorporation require the favorable vote of the
holders of at least 66 2/3% of the Fund's shares of capital stock then
entitled to be voted, voting as a single class, to approve, adopt or authorize
the following:
 
    (i) a merger or consolidation or statutory share exchange of the Fund
  with other corporations,
 
    (ii) a sale of all or substantially all of the Fund's assets (other than
  in the regular course of the Fund's investment activities), or
 
    (iii) a liquidation or dissolution of the Fund, unless such action has
  been approved, adopted or authorized by the affirmative vote of two-thirds
  of the total number of Directors fixed in accordance with the by-laws, in
  which case the affirmative vote of a majority of the Fund's shares of
  capital stock is required. Following the proposed issuance of the preferred
  stock, it is anticipated that the approval, adoption or authorization of
  the foregoing would also require the favorable vote of a majority of the
  Fund's shares of preferred stock then entitled to be voted, voting as a
  separate class.
 
  In addition, conversion of the Fund to an open-end investment company would
require an amendment to the Fund's Articles of Incorporation. The amendment
would have to be declared advisable by the Board of Directors prior to its
submission to shareholders. Such an amendment would require the favorable vote
of the holders of at least 66 2/3% of the Fund's outstanding shares of capital
stock (including any preferred stock) entitled to be voted on the matter,
voting as a single class (or a majority of such shares if the amendment was
previously approved, adopted or authorized by two-thirds of the total number
of Directors fixed in accordance with the by-laws), and, assuming preferred
stock is issued, the affirmative vote of a majority of outstanding shares of
preferred stock of the Fund, voting as a separate class. Such a vote also
would satisfy a separate requirement in the 1940 Act that the change be
approved by the shareholders. Shareholders of an open-end investment company
may require the company to redeem their shares of common stock at any time
(except in certain circumstances as authorized by or under the 1940 Act) at
their net asset value, less such redemption charge, if any, as might be in
effect at the time of a redemption. All redemptions will be made in cash. If
the Fund is converted to an open-end investment company, it could be required
to liquidate portfolio securities to meet requests for redemption, and the
Common Stock would no longer be listed on a stock exchange.
 
  Conversion to an open-end investment company would also require redemption
of all outstanding shares of preferred stock and would require changes in
certain of the Fund's investment policies and restrictions, such as those
relating to the issuance of senior securities, the borrowing of money and the
purchase of illiquid securities.
 
 
                                      39
<PAGE>
 
  The Board of Directors has determined that the 66 2/3% voting requirements
described above, which are greater than the minimum requirements under
Maryland law or the 1940 Act, are in the best interests of shareholders
generally. Reference should be made to the Charter on file with the Securities
and Exchange Commission for the full text of these provisions.
 
                                   CUSTODIAN
 
  The Fund's securities and cash are held under a custodial agreement with The
Bank of New York, 90 Washington Street, New York, New York 10286.
 
                                 UNDERWRITING
   
  Merrill Lynch, Pierce, Fenner & Smith Incorporated (the "Underwriter") has
agreed, subject to the terms and conditions of a Purchase Agreement with the
Fund and the Investment Adviser, to purchase 12,000,000 shares of Common Stock
from the Fund. The Underwriter is committed to purchase all of such shares if
any are purchased.     
   
  The Underwriter has advised the Fund that it proposes initially to offer the
shares of Common Stock to the public at the public offering price set forth on
the cover page of this Prospectus. There is no sales charge or underwriting
discount charged to investors on purchases of shares of Common Stock in the
offering. The Investment Adviser or an affiliate has agreed to pay the
Underwriter from its own assets a commission in connection with the sale of
shares of Common Stock in the offering in the amount of $.30 per share. Such
payment is equal to 2.00% of the initial public offering price per share. The
Underwriter also has advised the Fund that from this amount the Underwriter
may pay a concession to certain dealers not in excess of $.30 per share on
sales by such dealers. After the initial public offering, the public offering
price and other selling terms may be changed. Investors must pay for shares of
Common Stock purchased in the offering on or before May 1, 1998.     
   
  The Fund has granted the Underwriter an option, exercisable for 45 days
after the date hereof, to purchase up to 1,800,000 additional shares of Common
Stock to cover over-allotments, if any, at the initial offering price.     
 
  The Underwriter may engage in certain transactions that stabilize the price
of the shares of Common Stock. Such transactions consist of bids or purchases
for the purpose of pegging, fixing or maintaining the price of the shares of
Common Stock.
 
  If the Underwriter creates a short position in the shares of Common Stock in
connection with the offering, i.e., if it sells more shares of Common Stock
than are set forth on the cover page of this Prospectus, the Underwriter may
reduce that short position by purchasing shares of Common Stock in the open
market. The Underwriter also may elect to reduce any short position by
exercising all or part of the over-allotment option described above.
 
  The Underwriter also may impose a penalty bid on certain selling group
members. This means that if the Underwriter purchases shares of Common Stock
in the open market to reduce the Underwriter's short position or to stabilize
the price of the shares of Common Stock, it may reclaim the amount of the
selling concession from the selling group members who sold those shares of
Common Stock as part of the offering.
 
                                      40
<PAGE>
 
  In general, purchases of a security for the purpose of stabilization or to
reduce a short position could cause the price of the security to be higher
than it might be in the absence of such purchases. The imposition of a penalty
bid might also have an effect on the price of a security to the extent that it
were to discourage resales of the security.
 
  Neither the Fund nor the Underwriter makes any representation or prediction
as to the direction or magnitude of any effect that the transactions described
above may have on the price of the shares of Common Stock. In addition,
neither the Fund nor the Underwriter makes any representation that the
Underwriter will engage in such transactions or that such transactions, once
commenced, will not be discontinued without notice.
   
  Prior to this offering, there has been no public market for the shares of
the Common Stock. The Fund's shares of Common Stock have been approved for
listing on the New York Stock Exchange. However, during an initial period
which is not expected to exceed two weeks from the date of this Prospectus,
the Fund's Common Stock will not be listed on any securities exchange.
Additionally, during such period, the Underwriter does not intend to make a
market in the Fund's Common Stock, although a limited market may develop.
Consequently, it is anticipated that an investment in the Fund will be
illiquid during such period. In order to meet the requirements for listing,
the Underwriter has undertaken to sell lots of 100 or more shares to a minimum
of 2,000 beneficial owners.     
 
  The Fund anticipates that the Underwriter may from time to time act as a
broker in connection with the execution of its portfolio transactions. The
Fund has obtained an exemptive order permitting it to engage in certain
principal transactions with the Underwriter involving high quality, short-
term, tax-exempt securities subject to certain conditions. See "Investment
Restrictions" and "Portfolio Transactions."
 
  The Underwriter is an affiliate of the Investment Adviser of the Fund.
 
  The Fund and the Investment Adviser have agreed to indemnify the Underwriter
against certain liabilities, including liabilities under the Securities Act of
1933.
 
            TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND REGISTRAR
   
  The transfer agent, dividend disbursing agent and registrar for the shares
of Common Stock of the Fund will be The Bank of New York, 101 Barclay Street,
New York, New York 10286.     
 
                                LEGAL OPINIONS
 
  Certain legal matters in connection with the Common Stock offered hereby
will be passed upon for the Fund and the Underwriter by Brown & Wood LLP, New
York, New York.
 
                                    EXPERTS
   
  The statement of assets, liabilities and capital of the Fund as of April 20,
1998 included in this Prospectus and Registration Statement has been audited
by Ernst & Young LLP, independent auditors, as set forth in their report
thereon appearing elsewhere herein, and is included in reliance upon such
report given upon the authority of such firm as experts in accounting and
auditing. The selection of independent auditors is subject to ratification by
shareholders of the Fund.     
 
                                      41
<PAGE>
 
                            ADDITIONAL INFORMATION
 
  The Fund is subject to the informational requirements of the Securities
Exchange Act of 1934 and the 1940 Act and in accordance therewith is required
to file reports, proxy statements and other information with the Commission.
Any such reports, proxy statements and other information can be inspected and
copied at the public reference facilities of the Commission at Room 1024,
Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
following regional offices of the Commission: Regional Office, at Seven World
Trade Center, Suite 1300, New York, New York 10048; Pacific Regional Office,
at 5670 Wilshire Boulevard, 11th Floor, Los Angeles, California 90036; and
Midwest Regional Office, at Northwestern Atrium Center, 500 West Madison
Street, Suite 1400, Chicago, Illinois 60661-2511. Copies of such materials can
be obtained from the public reference section of the Commission at 450 Fifth
Street, N.W., Washington, D.C. 20549, at prescribed rates. The Commission
maintains a Web site at http://www.sec.gov containing reports, proxy and
information statements and other information regarding registrants, including
the Fund, that file electronically with the Commission. Reports, proxy
statements and other information concerning the Fund can also be inspected at
the offices of the New York Stock Exchange, 20 Broad Street, New York, New
York 10005.
 
  Additional information regarding the Fund and the shares of Common Stock is
contained in the Registration Statement on Form N-2, including amendments,
exhibits and schedules thereto, relating to such shares filed by the Fund with
the Commission in Washington, D.C. This Prospectus does not contain all of the
information set forth in the Registration Statement, including any amendments,
exhibits and schedules thereto. For further information with respect to the
Fund and the shares offered hereby, reference is made to the Registration
Statement. Statements contained in this Prospectus as to the contents of any
contract or other document referred to are not necessarily complete and in
each instance reference is made to the copy of such contract or other document
filed as an exhibit to the Registration Statement, each such statement being
qualified in all respects by such reference. A copy of the Registration
Statement may be inspected without charge at the Commission's principal office
in Washington, D.C., and copies of all or any part thereof may be obtained
from the Commission upon the payment of certain fees prescribed by the
Commission.
 
YEAR 2000 ISSUES
 
  Many computer systems were designed using only two digits to designate
years. These systems may not be able to distinguish the Year 2000 from the
Year 1900 (commonly known as the "Year 2000 Problem"). Like other investment
companies and financial and business organizations, the Fund could be
adversely affected if the computer systems used by the Investment Adviser or
other Fund service providers do not properly address this problem prior to
January 1, 2000. The Investment Adviser has established a dedicated group to
analyze these issues and to implement any systems modifications necessary to
prepare for the Year 2000. Currently, the Investment Adviser does not
anticipate that the transition to the 21st Century will have any material
impact on its ability to continue to service the Fund at current levels. In
addition, the Investment Adviser has sought assurances from the Fund's other
service providers that they are taking all necessary steps to ensure that
their computer systems will accurately reflect the Year 2000, and the
Investment Adviser will continue to monitor the situation. At this time,
however, no assurance can be given that the Fund's other service providers
have anticipated every step necessary to avoid any adverse effect on the Fund
attributable to the Year 2000 Problem.
 
                                      42
<PAGE>
 
                        REPORT OF INDEPENDENT AUDITORS
   
To the Board of Directors and Shareholder of     
 MuniHoldings Insured Fund, Inc.
   
We have audited the accompanying statement of assets, liabilities and capital
of MuniHoldings Insured Fund, Inc. as of April 20, 1998. This statement of
assets, liabilities and capital is the responsibility of the Fund's
management. Our responsibility is to express an opinion on this statement of
assets, liabilities and capital based on our audit.     
 
We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the statement of assets, liabilities
and capital is free of material misstatement. An audit includes examining, on
a test basis, evidence supporting the amounts and disclosures in the statement
of assets, liabilities and capital. An audit also includes assessing the
accounting principles used and significant estimates made by management, as
well as evaluating the overall statement of assets, liabilities and capital
presentation. We believe that our audit provides a reasonable basis for our
opinion.
   
In our opinion, the statement of assets, liabilities and capital referred to
above presents fairly, in all material respects, the financial position of
MuniHoldings Insured Fund, Inc. at April 20, 1998, in conformity with
generally accepted accounting principles.     
                                             
                                          Ernst & Young LLP     
   
Princeton, New Jersey     
   
April 23, 1998     
 
                                      43
<PAGE>
 
                        MUNIHOLDINGS INSURED FUND, INC.
 
                 STATEMENT OF ASSETS, LIABILITIES AND CAPITAL
                                 
                              APRIL 20, 1998     
 
<TABLE>   
<S>                                                                    <C>
ASSETS
  Cash................................................................ $100,005
  Deferred organization and offering expenses (Note 1)................  358,250
                                                                       --------
    Total assets......................................................  458,255
                                                                       --------
LIABILITIES
  Accrued expenses (Note 1)...........................................  358,250
                                                                       --------
NET ASSETS............................................................ $100,005
                                                                       ========
CAPITAL
  Common Stock, par value $.10 per share; 200,000,000 shares autho-
   rized; 6,667 shares issued and outstanding (Note 1)................ $    667
  Paid-in Capital in excess of par....................................   99,338
                                                                       --------
  Total Capital-Equivalent to $15.00 net asset value per share of com-
   mon stock (Note 1)................................................. $100,005
                                                                       ========
</TABLE>    
 
             NOTES TO STATEMENT OF ASSETS, LIABILITIES AND CAPITAL
 
NOTE 1. ORGANIZATION
   
  The Fund was incorporated under the laws of the State of Maryland on March
11, 1998 as a closed-end, non-diversified management investment company and
has had no operations other than the sale to Fund Asset Management, L.P. (the
"Investment Adviser") of an aggregate of 6,667 shares for $100,005 on April
20, 1998. The General Partner of the Investment Adviser is an indirect,
wholly-owned subsidiary of Merrill Lynch & Co., Inc.     
 
  Deferred organization costs will be amortized on a straight-line basis over
a five-year period beginning with the commencement of operations of the Fund.
Direct costs relating to the public offering of the Fund's shares will be
charged to capital at the time of issuance of shares.
 
NOTE 2. MANAGEMENT ARRANGEMENTS
   
  The Fund has engaged the Investment Adviser to provide investment advisory
and management services to the Fund. The Investment Adviser will receive a
monthly fee for advisory services, at an annual rate equal to 0.55 of 1% of
the average weekly net assets of the Fund, including proceeds from the sale of
preferred stock. The Investment Adviser or an affiliate will pay Merrill
Lynch, Pierce, Fenner & Smith Incorporated a commission in the amount of 2.00%
of the price to the public per share in connection with the initial public
offering of the Fund's Common Stock.     
 
NOTE 3. FEDERAL INCOME TAXES
 
  The Fund intends to qualify as a "regulated investment company" and as such
(and by complying with the applicable provisions of the Internal Revenue Code
of 1986, as amended) will not be subject to Federal income tax on taxable
income (including realized capital gains) that is distributed to shareholders.
 
                                      44
<PAGE>
 
                                  APPENDIX I
 
                          RATINGS OF MUNICIPAL BONDS
 
DESCRIPTION OF MOODY'S INVESTORS SERVICE, INC. ("MOODY'S") MUNICIPAL BOND
RATINGS
 
Aaa  Bonds which are rated Aaa are judged to be of the best quality. They
     carry the smallest degree of investment risk and are generally
     referred to as "gilt edge." Interest payments are protected by a large
     or by an exceptionally stable margin and principal is secure. While
     the various protective elements are likely to change, such changes as
     can be visualized are most unlikely to impair the fundamentally strong
     position of such issues.
 
Aa   Bonds which are rated Aa are judged to be of high quality by all
     standards. Together with the Aaa group they comprise what are
     generally known as high grade bonds. They are rated lower than the
     best bonds because margins of protection may not be as large as in Aaa
     securities or fluctuation of protective elements may be of greater
     amplitude or there may be other elements present which make the long-
     term risks appear somewhat larger than in Aaa securities.
 
A    Bonds which are rated A possess many favorable investment attributes
     and are to be considered as upper medium grade obligations. Factors
     giving security to principal and interest are considered adequate, but
     elements may be present which suggest a susceptibility to impairment
     sometime in the future.
 
Baa  Bonds which are rated Baa are considered as medium grade obligations,
     i.e., they are neither highly protected nor poorly secured. Interest
     payment and principal security appear adequate for the present but
     certain protective elements may be lacking or may be
     characteristically unreliable over any great length of time. Such
     bonds lack outstanding investment characteristics and in fact have
     speculative characteristics as well.
 
Ba   Bonds which are rated Ba are judged to have speculative elements;
     their future cannot be considered as well assured. Often the
     protection of interest and principal payments may be very moderate and
     thereby not well safeguarded during both good and bad times over the
     future. Uncertainty of position characterizes bonds in this class.
 
B    Bonds which are rated B generally lack characteristics of the
     desirable investment. Assurance of interest and principal payments or
     of maintenance of other terms of the contract over any long period of
     time may be small.
 
Caa  Bonds which are rated Caa are of poor standing. Such issues may be in
     default or there may be present elements of danger with respect to
     principal or interest.
 
Ca   Bonds which are rated Ca represent obligations which are speculative
     in a high degree. Such issues are often in default or have other
     marked shortcomings.
 
C
     Bonds which are rated C are the lowest rated class of bonds, and
     issues so rated can be regarded as having extremely poor prospects of
     ever attaining any real investment standing.
 
  Note: Those bonds in the Aa, A, Baa, Ba and B categories which Moody's
believes possess the strongest credit attributes within those categories are
designated by the symbols Aa1, A1, Baa1, Ba1 and B1.
 
  Short-term Notes: The four ratings of Moody's for short-term notes are MIG
1/VMIG1, MIG 2/VMIG2, MIG 3/VMIG3 and MIG 4/VMIG4; MIG 1/VMIG1 denotes "best
quality . . . strong protection by established cash flows"; MIG 2/VMIG2
denotes "high quality" with ample margins of protection; MIG 3/VMIG3 notes are
of "favorable quality . . . but . . . lacking the undeniable strength of the
preceding grades"; MIG 4/VMIG4 notes are of "adequate quality . . .
[p]rotection commonly regarded as required of an investment security is
present . . . there is specific risk."
 
 
                                      I-1
<PAGE>
 
DESCRIPTION OF MOODY'S COMMERCIAL PAPER RATINGS
 
  Moody's Commercial Paper ratings are opinions of the ability of issuers to
repay punctually promissory obligations not having an original maturity in
excess of nine months. Moody's employs the following three designations, all
judged to be investment grade, to indicate the relative repayment ability of
rated issuers:
 
  Issuers rated Prime-1 (or related supporting institutions) have a superior
ability for repayment of short-term promissory obligations. Prime-1 repayment
ability will often be evidenced by the following characteristics: leading
market positions in well established industries; high rates of return on funds
employed; conservative capitalization structure with moderate reliance on debt
and ample asset protection; broad margins in earning coverage of fixed
financial charges and high internal cash generation; and well established
access to a range of financial markets and assured sources of alternate
liquidity.
 
  Issuers rated Prime-2 (or related supporting institutions) have a strong
ability for repayment of short-term promissory obligations. This will normally
be evidenced by many of the characteristics cited above but to a lesser degree.
Earnings trends and coverage ratios, while sound, may be more subject to
variation. Capitalization characteristics, while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.
 
  Issuers rated Prime-3 (or supporting institutions) have an acceptable ability
for repayment of short-term promissory obligations. The effect of industry
characteristics and market composition may be more pronounced. Variability in
earnings and profitability may result in changes in the level of debt
protection measurements and may require relatively high financial leverage.
Adequate alternate liquidity is maintained.
 
  Issuers rated Not Prime do not fall within any of the Prime rating
categories.
 
DESCRIPTION OF STANDARD & POOR'S, A DIVISION OF THE MCGRAW-HILL COMPANIES, INC.
 ("STANDARD & POOR'S"), MUNICIPAL DEBT RATINGS
 
  A Standard & Poor's issue credit rating is a current opinion of the
creditworthiness of an obligor with respect to a specific financial obligation,
a specific class of financial obligations, or a specific financial program. It
takes into consideration the creditworthiness of guarantors, insurers or other
forms of credit enhancement on the obligation.
 
  The issue credit rating is not a recommendation to purchase, sell or hold a
financial obligation, inasmuch as it does not comment as to market price or
suitability for a particular investor.
 
  The ratings are based on current information furnished by the obligors or
obtained by Standard & Poor's from other sources it considers reliable.
Standard & Poor's does not perform an audit in connection with any rating and
may, on occasion, rely on unaudited financial information. The ratings may be
changed, suspended or withdrawn as a result of changes in, or unavailability
of, such information, or based on other circumstances.
 
  The ratings are based, in varying degrees, on the following considerations:
 
   I.  Likelihood of payment-capacity and willingness of the obligor to meet
       its financial commitment on an obligation in accordance with the terms
       of obligation;
 
  II.  Nature of and provisions of the obligation; and
 
  III.  Protection afforded by, and relative position of, the obligation in
        the event of bankruptcy, reorganization or other arrangement under
        the laws of bankruptcy and other laws affecting creditors' rights.
 
     AAA  Debt rated "AAA" has the highest rating assigned by Standard &
          Poor's. The obligor's capacity to meet its financial commitment
          on the obligation is extremely strong.
 
                                      I-2
<PAGE>
 
          AA  Debt rated "AA" differs from the highest rated obligations only
              in small degree. The obligor's capacity to meet its financial
              commitment on the obligation is very strong.
 
           A  Debt rated "A" is somewhat more susceptible to the adverse
              effects of changes in circumstances and economic conditions than
              debt in higher-rated categories. However, the obligor's capacity
              to meet its financial commitment on the obligation is still
              strong.
 
         BBB  Debt rated "BBB" exhibits adequate protection parameters.
              However, adverse economic conditions or changing circumstances
              are more likely to lead to a weakened capacity of the obligor to
              meet its financial commitment to the obligation.
 
          BB  Debt rated "BB," "B," "CCC," "CC" and "C" is regarded as having
           B  significant speculative characteristics. "BB" indicates the
         CCC  least degree of speculation and "C" the highest degree of
          CC  speculation. While such bonds will likely have some quality and
           C  protective characteristics, these may be outweighed by large
              uncertainties or major exposures to adverse conditions.
 
           D  Debt rated "D" is in payment default. The "D" rating category is
              used when payments on an obligation are not made on the date due
              even if the applicable grace period has not expired, unless
              Standard & Poor's believes that such payments will be made
              during such grace period. The "D" rating also will be used upon
              the filing of a bankruptcy petition or the taking of a similar
              action if payments on an obligation are jeopardized.
 
  Plus (+) or Minus (-): The ratings from "AA" to "CCC" may be modified by the
addition of a plus or minus sign to show relative standing within the major
rating categories.
 
DESCRIPTION OF STANDARD & POOR'S COMMERCIAL PAPER RATINGS
 
  A Standard & Poor's Commercial Paper rating is a current assessment of the
likelihood of timely payment of debt having an original maturity of no more
than 365 days. Ratings are graded into several categories, ranging from "A-1"
for the highest-quality obligations to "D" for the lowest. These categories
are as follows:
 
A-1 This highest category indicates that the degree of safety regarding
    timely payment is strong. Those issues determined to possess extremely
    strong safety characteristics are denoted with a plus sign (+)
    designation.
 
A-2 Capacity for timely payment on issues with this designation is
    satisfactory. However, the relative degree of safety is not as high as
    for issues designated "A-1".
 
A-3
    Issues carrying this designation have an adequate capacity for timely
    payment. They are, however, more vulnerable to the adverse effects of
    changes in circumstances than obligations carrying the higher
    designations.
 
B
    Issues rated "B" are regarded as having only speculative capacity for
    timely payment.
 
C   This rating is assigned to short-term debt obligations with a doubtful
    capacity for payment.
 
D   Debt rated "D" is in payment default. The "D" rating category is used
    when interest payments or principal payments are not made on the date
    due, even if the applicable grace period has not expired, unless
    Standard & Poor's believes that such payments will be made during such
    grace period.
 
  A Commercial Paper rating is not a recommendation to purchase or sell a
security. The ratings are based on current information furnished to Standard &
Poor's by the issuer or obtained by Standard & Poor's from other sources it
considers reliable. The ratings may be changed, suspended, or withdrawn as a
result of changes in, or unavailability of, such information.
 
                                      I-3
<PAGE>
 
DESCRIPTION OF STANDARD & POOR'S SHORT-TERM ISSUED CREDIT RATINGS
 
  A Standard & Poor's note rating reflects the liquidity factors and market
access risks unique to notes. Notes due in three years or less will likely
receive a note rating. Notes maturing beyond three years will most likely
receive a long-term debt rating. The following criteria will be used in making
that assessment.
 
  --Amortization schedule--the larger the final maturity relative to other
  maturities, the more likely it will be treated as a note.
 
  --Source of payment--the more dependent the issue is on the market for its
  refinancing, the more likely it will be treated as a note.
 
Note rating symbols are as follows:
 
  SP-1  Strong capacity to pay principal and interest. An issue determined to
        possess a very strong capacity to pay debt service is given a plus
        "+" designation.
 
  SP-2  Satisfactory capacity to pay principal and interest, with some
        vulnerability to adverse financial and economic changes over the term
        of the notes.
 
  SP-3  Speculative capacity to pay principal and interest.
 
DESCRIPTION OF FITCH IBCA, INC. ("FITCH") INVESTMENT GRADE BOND RATINGS
 
  Fitch investment grade bond ratings provide a guide to investors in
determining the credit risk associated with a particular security. The rating
represents Fitch's assessment of the issuer's ability to meet the obligations
of a specific debt issue or class of debt in a timely manner.
 
  The rating takes into consideration special features of the issue, its
relationship to other obligations of the issuer, the current and prospective
financial condition and operating performance of the issuer and any guarantor,
as well as the economic and political environment that might affect the
issuer's future financial strength and credit quality.
 
  Fitch ratings do not reflect any credit enhancement that may be provided by
insurance policies or financial guarantees unless otherwise indicated.
 
  Bonds carrying the same rating are of similar but not necessarily identical
credit quality since the rating categories do not fully reflect small
differences in the degrees of credit risk.
 
  Fitch ratings are not recommendations to buy, sell, or hold any security.
Ratings do not comment on the adequacy of market price, the suitability of any
security for a particular investor, or the tax-exempt nature or taxability of
payments made in respect of any security.
 
  Fitch ratings are based on information obtained from issuers, other
obligors, underwriters, their experts, and other sources Fitch believes to be
reliable. Fitch does not audit or verify the truth or accuracy of such
information. Ratings may be changed, suspended, or withdrawn as a result of
changes in, or the unavailability of, information or for other reasons.
 
AAA     Bonds considered to be investment grade and of the highest credit
        quality. The obligor has an exceptionally strong ability to pay
        interest and repay principal, which is unlikely to be affected by
        reasonably foreseeable events.
 
AA      Bonds considered to be investment grade and of very high credit
        quality. The obligor's ability to pay interest and repay principal is
        very strong, although not quite as strong as bonds rated "AAA."
        Because bonds rated in the "AAA" and "AA" categories are not
        significantly vulnerable to foreseeable future developments, short-
        term debt of these issuers is generally rated "F-1+."
 
                                      I-4
<PAGE>
 
A         Bonds considered to be investment grade and of high credit quality.
          The obligor's ability to pay interest and repay principal is
          considered to be strong, but may be more vulnerable to adverse
          changes in economic conditions and circumstances than bonds with
          higher ratings.
 
BBB       Bonds considered to be investment grade and of satisfactory-credit
          quality. The obligor's ability to pay interest and repay principal
          is considered to be adequate. Adverse changes in economic conditions
          and circumstances, however, are more likely to have adverse impact
          on these bonds, and therefore impair timely payment. The likelihood
          that the ratings of these bonds will fall below investment grade is
          higher than for bonds with higher ratings.
 
  Plus (+) or Minus (-): Plus and minus signs are used with a rating symbol to
indicate the relative position of a credit within the rating category. Plus
and minus signs, however, are not used in the "AAA" category.
 
NR        Indicates that Fitch does not rate the specific issue.
 
Conditional  A conditional rating is premised on the successful completion of
             a project or the occurrence of a specific event.
 
Suspended  A rating is suspended when Fitch deems the amount of information
           available from the issuer to be inadequate for rating purposes.
 
Withdrawn  A rating will be withdrawn when an issue matures or is called or
           refinanced and, at Fitch's discretion, when an issuer fails to
           furnish proper and timely information.
 
FitchAlert  Ratings are placed on FitchAlert to notify investors of an
            occurrence that is likely to result in a rating change and the
            likely direction of such change. These are designated as
            "Positive," indicating a potential upgrade, "Negative," for
            potential downgrade, or "Evolving," where ratings may be raised or
            lowered. FitchAlert is relatively short-term, and should be
            resolved within 12 months.
 
  Ratings Outlook: An outlook is used to describe the most likely direction of
any rating change over the intermediate term. It is described as "Positive" or
"Negative." The absence of a designation indicates a stable outlook.
 
DESCRIPTION OF FITCH'S SPECULATIVE GRADE BOND RATINGS
 
  Fitch speculative grade bond ratings provide a guide to investors in
determining the credit risk associated with a particular security. The ratings
("BB" to "C") represent Fitch's assessment of the likelihood of timely payment
of principal and interest in accordance with the terms of obligation for bond
issues not in default. For defaulted bonds, the rating ("DDD" to "D") is an
assessment of the ultimate recovery value through reorganization or
liquidation.
 
  The rating takes into consideration special features of the issue, its
relationship to other obligations of the issuer, the current and prospective
financial condition and operating performance of the issuer and any guarantor,
as well as the economic and political environment that might affect the
issuer's future financial strength.
 
  Bonds that have the rating are of similar but not necessarily identical
credit quality since rating categories cannot fully reflect the differences in
degrees of credit risk.
 
 BB   Bonds are considered speculative. The obligor's ability to pay interest
      and repay principal may be affected over time by adverse economic
      changes. However, business and financial alternatives can be identified
      which could assist the obligor in satisfying its debt service
      requirements.
 
  B   Bonds are considered highly speculative. While bonds in this class are
      currently meeting debt service requirements, the probability of
      continued timely payment of principal and interest reflects the
      obligor's limited margin of safety and the need for reasonable business
      and economic activity throughout the life of the issue.
 
                                      I-5
<PAGE>
 
<TABLE>
 <C> <S>
 CCC Bonds have certain identifiable characteristics which, if not remedied,
     may lead to default. The ability to meet obligations requires an
     advantageous business and economic environment.
  CC Bonds are minimally protected. Default in payment of interest and/or
     principal seems probable over time.
   C Bonds are in imminent default in payment of interest or principal.
 DDD Bonds are in default on interest and/or principal payments. Such bonds are
  DD extremely speculative and should be valued on the basis of their ultimate
   D recovery value in liquidation or reorganization of the obligor. "DDD"
     represents the highest potential for recovery on these bonds, and "D"
     represents the lowest potential for recovery.
</TABLE>
 
  Plus (+) or Minus (-): Plus and minus signs are used with a rating symbol to
indicate the relative position of a credit within the rating category. Plus
and minus signs, however, are not used in the "DDD," "DD," or "D" categories.
 
DESCRIPTION OF FITCH'S SHORT-TERM RATINGS
 
  Fitch's short-term ratings apply to debt obligations that are payable on
demand or have original maturities of up to three years, including commercial
paper, certificates of deposit, medium-term notes, and municipal and
investment notes.
 
  The short-term rating places greater emphasis than a long-term rating on the
existence of liquidity necessary to meet the issuer's obligations in a timely
manner.
 
  Fitch short-term ratings are as follows:
 
F-1+   Exceptionally Strong Credit Quality. Issues assigned this rating are
       regarded as having the strongest degree of assurance for timely
       payment.
 
F-1    Very Strong Credit Quality. Issues assigned this rating reflect an
       assurance of timely payment only slightly less in degree than issues
       rated "F-1+."
 
F-2    Good Credit Quality. Issues assigned this rating have a satisfactory
       degree of assurance for timely payment, but the margin of safety is not
       as great as for issues assigned "F-1+" and "F-1" ratings.
 
F-3    Fair Credit Quality. Issues assigned this rating have characteristics
       suggesting that the degree of assurance for timely payment is adequate;
       however, near-term adverse changes could cause these securities to be
       rated below in investment grade.
 
F-S    Weak Credit Quality. Issues assigned this rating have characteristics
       suggesting a minimal degree of assurance for timely payment and are
       vulnerable to near-term adverse changes in financial and economic
       conditions.
 
D      Default. Issues assigned this rating are in actual or imminent payment
       default.
 
LOC    The symbol "LOC" indicates that the rating is based on a letter of
       credit issued by a commercial bank.
 
                                      I-6
<PAGE>
 
                                  APPENDIX II
 
                              PORTFOLIO INSURANCE
 
  Set forth below is further information with respect to the insurance
policies (the "Policies") that the Fund may obtain from several insurance
companies with respect to insured Municipal Bonds held by the Fund. The Fund
has no obligation to obtain any such Policies, and the terms of any Policies
actually obtained may vary significantly from the terms discussed below.
   
  In determining eligibility for insurance, insurance companies will apply
their own standards. These standards correspond generally to the standards
such companies normally use in establishing the insurability of new issues of
Municipal Bonds and are not necessarily the criteria that would be used in
regard to the purchase of such bonds by the Fund. The Policies do not insure
(i) municipal securities ineligible for insurance and (ii) municipal
securities no longer owned by the Fund.     
 
  The Policies do not guarantee the market value of the insured Municipal
Bonds or the value of the shares of the Fund. In addition, if the provider of
an original issuance insurance policy is unable to meet its obligations under
such policy or if the rating assigned to the insurance claims-paying ability
of any such insurer deteriorates, the insurance company will not have any
obligation to insure any issue held by the Fund that is adversely affected by
either of the above described events. In addition to the payment of premiums,
the Policies may require that the Fund notify the insurance company as to all
Municipal Bonds in the Fund's portfolio and permit the insurance company to
audit their records. The insurance premiums will be payable monthly by the
Fund in accordance with a premium schedule to be furnished by the insurance
company at the time the Policies are issued. Premiums are based upon the
amounts covered and the composition of the portfolio.
   
  The fund will seek to utilize insurance companies that have insurance
claims-paying ability ratings of AAA from Standard & Poor's, a division of the
The McGraw-Hill Companies, Inc. ("S&P") or Fitch IBCA, Inc. ("Fitch") or Aaa
from Moody's Investors Service ("Moody's"). There can be no assurance however,
that insurance from insurance carriers meeting these criteria will be at all
times available.     
 
  An S&P insurance claims-paying ability rating is an assessment of an
operating insurance company's financial capacity to meet obligations under an
insurance policy in accordance with the terms. An insurer with an insurance
claims-paying ability rating of AAA has the highest rating assigned by S&P.
Capacity to honor insurance contracts is considered by S&P to be extremely
strong and highly likely to remain so over a long period of time. A Fitch
insurance claims-paying ability rating provides an assessment of an insurance
company's financial strength and, therefore, its ability to pay policy and
contract claims under the terms indicated. An insurer with an insurance
claims-paying ability rating of AAA has the highest rating assigned by Fitch.
The ability to pay claims is adjudged by Fitch to be extremely strong for
insurance companies with this highest rating. In the opinion of Fitch,
foreseeable business and economic risk factors should not have any material
adverse impact on the ability of these insurers to pay claims. In Fitch's
opinion, profitability, overall balance sheet strength, capitalization and
liquidity are all at very secure levels and are unlikely to be affected by
potential adverse underwriting, investment or cyclical events. A Moody's
insurance claims-paying ability rating is an opinion of the ability of an
insurance company to repay punctually senior policyholder obligations and
claims. An insurer with an insurance claims-paying ability rating of Aaa is
considered by Moody's to be of the best quality. In the opinion of Moody's,
the policy obligations of an insurance company with an insurance claims-paying
ability rating of Aaa carry the smallest degree of credit risk and, while the
financial strength of these companies is likely to change, such changes as can
be visualized are most unlikely to impair the company's fundamentally strong
position.
 
                                     II-1
<PAGE>
 
  An insurance claims-paying ability rating of S&P, Fitch or Moody's does not
constitute an opinion on any specific contract in that such an opinion can
only be rendered upon the review of the specific insurance contract.
Furthermore, an insurance claims-paying ability rating does not take into
account deductibles, surrender or cancellation penalties or the timeliness of
payment; nor does it address the ability of a company to meet nonpolicy
obligations (i.e., debt contracts).
 
  The assignment of ratings by S&P, Fitch or Moody's to debt issues that are
fully or partially supported by insurance policies, contracts or guarantees is
a separate process from the determination of claims-paying ability ratings.
The likelihood of a timely flow of funds from the insurer to the trustee for
the bondholders is a key element in the rating determination for such debt
issues.
 
                                     II-2
<PAGE>
 
                                 APPENDIX III
 
                      TAXABLE EQUIVALENT YIELDS FOR 1998
 
<TABLE>
<CAPTION>
         TAXABLE INCOME*                                A TAX-EXEMPT YIELD OF
- ---------------------------------- 1998 FEDERAL --------------------------------------
SINGLE RETURN     JOINT RETURN     TAX BRACKET  5.00% 5.50% 6.00% 6.50%  7.00%  7.50%
- -------------  ------------------- ------------ ----- ----- ----- ------ ------ ------
                                                    IS EQUAL TO A TAXABLE YIELD OF
<S>            <C>                 <C>          <C>   <C>   <C>   <C>    <C>    <C>
  $ 25,351-
  $61,400      $   42,351-$102,300    28.00%    6.94% 7.64% 8.33%  9.03%  9.72% 10.42%
  $ 61,401-
  $128,100     $  102,301-$155,950    31.00%    7.25% 7.97% 8.70%  9.42% 10.14% 10.87%
  $128,101-
  $278,450     $  155,951-$278,450    36.00%    7.81% 8.59% 9.38% 10.16% 10.94% 11.72%
  Over
  $278,450     Over $278,450          39.60%    8.28% 9.11% 9.93% 10.76% 11.59% 12.42%
</TABLE>
- --------
* An investor's marginal tax rate may exceed the rates shown in the above
  table due to the reduction, or possible elimination, of the personal
  exemption deduction for high-income taxpayers and an overall limit on
  itemized deductions. Income also may be subject to certain state and local
  taxes. For investors who pay alternative minimum tax, tax-exempt yields may
  be equivalent to lower taxable yields than those shown above. The tax rates
  shown above do not apply to corporate taxpayers. The tax characteristics of
  the Fund are described more fully elsewhere in this Prospectus. Consult your
  tax adviser for further details. This chart is for illustrative purposes
  only and cannot be taken as an indication of anticipated Fund performance.
 
                                     III-1
<PAGE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING OF ANY SECURITIES
OTHER THAN THE REGISTERED SECURITIES TO WHICH IT RELATES OR AN OFFER TO ANY
PERSON IN ANY STATE OR JURISDICTION OF THE UNITED STATES OR ANY COUNTRY WHERE
SUCH OFFER WOULD BE UNLAWFUL.
 
                                ---------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           -----
<S>                                                                        <C>
Prospectus Summary........................................................     3
Risk Factors and Special Considerations...................................     7
Fee Table.................................................................     9
The Fund..................................................................    10
Use of Proceeds...........................................................    10
Investment Objective and Policies.........................................    10
Risks and Special Considerations of Leverage..............................    20
Investment Restrictions...................................................    23
Directors and Officers....................................................    24
Investment Advisory and Management Arrangements...........................    26
Portfolio Transactions....................................................    28
Dividends and Distributions...............................................    29
Taxes.....................................................................    30
Automatic Dividend Reinvestment Plan......................................    33
Mutual Fund Investment Option.............................................    35
Net Asset Value...........................................................    36
Description of Capital Stock..............................................    36
Custodian.................................................................    40
Underwriting..............................................................    40
Transfer Agent, Dividend Disbursing Agent and Registrar...................    41
Legal Opinions............................................................    41
Experts...................................................................    41
Additional Information....................................................    42
Report of Independent Auditors............................................    43
Statement of Assets, Liabilities and Capital..............................    44
Appendix I................................................................   I-1
Appendix II...............................................................  II-1
Appendix III.............................................................. III-1
</TABLE>
 
                                ---------------
   
  UNTIL JULY 27, 1998 (90 DAYS AFTER THE COMMENCEMENT OF THE OFFERING), ALL
DEALERS EFFECTING TRANSACTIONS IN THE COMMON STOCK, WHETHER OR NOT
PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS.
THIS DELIVERY REQUIREMENT IS IN ADDITION TO THE OBLIGATION OF DEALERS TO
DELIVER A PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR
UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.     
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                                
                             12,000,000 SHARES     
 
                         MUNIHOLDINGS INSUREDFUND, INC.
 
                                  COMMON STOCK
 
                                ---------------
 
                                   PROSPECTUS
 
                                ---------------
 
                              MERRILL LYNCH & CO.
                                 
                              APRIL 28, 1998     
                                                              
                                                           CODE--19024-0598     
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                                    PART C
 
                               OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS.
 
  (1) Financial Statements
 
    Report of Independent Auditors
       
    Statement of Assets, Liabilities and Capital as of April 20, 1998     
 
  (2) Exhibits:
 
<TABLE>   
     <C>    <S>
     (a)    --Articles of Incorporation(a)
     (b)    --By-Laws(a)
     (c)    --Not applicable
     (d)(1) --Portions of the Articles of Incorporation and By-Laws of the
             Registrant defining the rights of holders of shares of the
             Registrant(b)
     (d)(2) --Form of specimen certificate for shares of Common Stock of the
             Registrant(a)
     (e)    --Form of Dividend Reinvestment Plan(a)
     (f)    --Not applicable
     (g)    --Form of Investment Advisory Agreement between the Fund and the
             Investment Adviser(a)
     (h)(1) --Form of Purchase Agreement(a)
     (h)(2) --Merrill Lynch Standard Dealer Agreement(a)
     (i)    --Not applicable
     (j)    --Form of Custodian Contract between the Fund and The Bank of New
             York(a)
     (k)    --Form of Registrar, Transfer Agency and Service Agreement between
             the Fund and The Bank of New York(a)
     (l)    --Opinion and Consent of Brown & Wood LLP
     (m)    --Not applicable
     (n)    --Consent of Ernst & Young LLP, independent auditors for the Fund
     (o)    --Not applicable
     (p)    --Certificate of Fund Asset Management, L.P.
     (q)    --Not applicable
     (r)    --Not applicable
</TABLE>    
- --------
   
(a) Filed on March 19, 1998 as an Exhibit to the Registrant's Registration
    Statement on Form N-2 (File No. 333-48289).     
   
(b) Reference is made to Article V, Article VI (sections 2,3,4,5 and 6),
    Article VII, Article VIII, Article X, Article XI, Article XII and Article
    XIII of the Registrant's Articles of Incorporation, filed as Exhibit (a)
    to this Registration Statement; and to Article II, Article III (sections
    1,2,3,5 and 17), Article VI, Article VII, Article XII, Article XIII and
    Article XIV of the Registrant's By-Laws, filed as Exhibit (b) to this
    Registration Statement.     
       
ITEM 25. MARKETING ARRANGEMENTS.
   
  See Exhibits (h)(1) and (h)(2).     
 
                                      C-1
<PAGE>
 
ITEM 26. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
  The following table sets forth the estimated expenses to be incurred in
connection with the offering described in this Registration Statement:
 
<TABLE>   
   <S>                                                                 <C>
   Registration fees.................................................. $ 61,065
   New York Stock Exchange listing fee................................  116,100
   Printing (other than stock certificates)...........................   60,000
   Engraving and printing stock certificates..........................   20,000
   Legal fees and expenses............................................   55,000
   Accounting fees and expenses.......................................    7,000
   NASD fees..........................................................   21,200
   Miscellaneous......................................................    4,635
                                                                       --------
     Total............................................................ $345,000
                                                                       ========
</TABLE>    
 
ITEM 27. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT.
 
  The information in the Prospectus under the caption "Investment Advisory and
Management Arrangements" and in Note 1 to the Statement of Assets, Liabilities
and Capital is incorporated herein by reference.
 
ITEM 28. NUMBER OF HOLDERS OF SECURITIES.
 
  There will be one record holder of the Common Stock, par value $0.10 per
share, as of the effective date of this Registration Statement.
 
ITEM 29. INDEMNIFICATION.
 
  Section 2-418 of the General Corporation Law of the State of Maryland,
Article VI of the Registrant's Articles of Incorporation, filed as Exhibit
(a)(1) to this Registration Statement, Article VI of the Registrant's By-Laws,
filed as Exhibit (b) to this Registration Statement, and the Investment
Advisory Agreement, a form of which will be filed as Exhibit (g)(1) to this
Registration Statement, provide for indemnification.
 
  Insofar as indemnification for liabilities arising under the Securities Act
of 1933, as amended (the "1933 Act") may be provided to directors, officers
and controlling persons of the Fund, pursuant to the foregoing provisions or
otherwise, the Fund has been advised that in the opinion of the Securities and
Exchange Commission, such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by
the Fund of expenses incurred or paid by a director, officer or controlling
person of the Fund in connection with any successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered, the Fund will,
unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as
expressed in the Act and will be governed by the final adjudication of such
issue.
 
  Reference is made to Section Six of the Purchase Agreement, a form of which
will be filed as Exhibit (h)(1) hereto, for provisions relating to the
indemnification of the underwriter.
 
                                      C-2
<PAGE>
 
ITEM 30. BUSINESS AND OTHER CONNECTIONS OF THE INVESTMENT ADVISER.
   
  Fund Asset Management, L.P. (the "Investment Adviser"), an affiliate of
MLAM, acts as investment adviser for the following open-end registered
investment companies: CBA Money Fund, CMA Government Securities Fund, CMA
Money Fund, CMA Multi-State Municipal Series Trust, CMA Tax-Exempt Fund, CMA
Treasury Fund, The Corporate Fund Accumulation Program, Inc., Financial
Institutions Series Trust, Merrill Lynch Basic Value Fund, Inc., Merrill Lynch
California Municipal Series Trust, Merrill Lynch Corporate Bond Fund, Inc.,
Merrill Lynch Emerging Tigers Fund, Inc., Merrill Lynch Federal Securities
Trust, Merrill Lynch Funds for Institutions Series, Merrill Lynch Multi-State
Limited Maturity Municipal Series Trust, Merrill Lynch Multi-State Municipal
Series Trust, Merrill Lynch Municipal Bond Fund, Inc., Merrill Lynch Phoenix
Fund, Inc., Merrill Lynch Special Value Fund, Inc., Merrill Lynch World Income
Fund, Inc., and The Municipal Fund Accumulation Program, Inc., and for the
following closed-end registered investment companies: Apex Municipal Fund,
Inc., Corporate High Yield Fund, Inc., Corporate High Yield Fund II, Inc.,
Corporate High Yield Fund III, Inc., Debt Strategies Fund, Inc., Debt
Strategies Fund II, Inc., Income Opportunities Fund 1999, Inc., Income
Opportunities Fund 2000, Inc., Merrill Lynch Municipal Strategy Fund, Inc.,
MuniAssets Fund, Inc., MuniEnhanced Fund, Inc., MuniHoldings California
Insured Fund, Inc., MuniHoldings California Insured Fund II, Inc.,
MuniHoldings Florida Insured Fund, MuniHoldings Florida Insured Fund II,
MuniHoldings Fund, Inc., MuniHoldings Fund II, Inc., MuniHoldings New Jersey
Insured Fund, Inc., MuniHoldings New York Fund, Inc., MuniHoldings New York
Insured Fund, Inc., MuniInsured Fund, Inc., MuniVest Florida Fund, MuniVest
Fund, Inc., MuniVest Fund II, Inc., MuniVest Michigan Insured Fund, Inc.,
MuniVest New Jersey Fund, Inc., MuniVest Pennsylvania Insured Fund, MuniYield
Arizona Fund, Inc., MuniYield California Fund, Inc., MuniYield California
Insured Fund, Inc., MuniYield California Insured Fund II, Inc., MuniYield
Florida Fund, MuniYield Florida Insured Fund, MuniYield Fund, Inc., MuniYield
Insured Fund, Inc., MuniYield Michigan Fund, Inc., MuniYield Michigan Insured
Fund, Inc., MuniYield New Jersey Fund, Inc., MuniYield New Jersey Insured
Fund, Inc., MuniYield New York Insured Fund, Inc., MuniYield New York Insured
Fund II, Inc., MuniYield Pennsylvania Fund, MuniYield Quality Fund, Inc.,
MuniYield Quality Fund II, Inc., Senior High Income Portfolio, Inc., and
Worldwide DollarVest Fund, Inc.     
 
  Merrill Lynch Asset Management, L.P. ("MLAM"), an affiliate of the
Investment Adviser, acts as the investment adviser for the following open-end
registered investment companies: Merrill Lynch Adjustable Rate Securities
Fund, Inc., Merrill Lynch Americas Income Fund, Inc., Merrill Lynch Asset
Builder Program, Inc., Merrill Lynch Asset Growth Fund, Inc., Merrill Lynch
Asset Income Fund, Inc., Merrill Lynch Capital Fund, Inc., Merrill Lynch
Convertible Fund, Inc., Merrill Lynch Developing Capital Markets Fund, Inc.,
Merrill Lynch Dragon Fund, Inc., Merrill Lynch EuroFund, Merrill Lynch
Fundamental Growth Fund, Inc., Merrill Lynch Fund For Tomorrow, Inc., Merrill
Lynch Global Bond Fund for Investment and Retirement, Merrill Lynch Global
Allocation Fund, Inc., Merrill Lynch Global Convertible Fund, Inc., Merrill
Lynch Global Growth Fund, Inc., Merrill Lynch Global Holdings, Merrill Lynch
Global Resources Trust, Merrill Lynch Global SmallCap Fund, Inc., Merrill
Lynch Global Utility Fund, Inc., Merrill Lynch Global Value Fund, Inc.,
Merrill Lynch Government Bond Fund, Inc., Merrill Lynch Growth Fund, Merrill
Lynch Healthcare Fund, Inc., Merrill Lynch Index Funds, Inc., Merrill Lynch
Intermediate Government Bond Fund, Merrill Lynch International Equity Fund,
Merrill Lynch Latin America Fund, Inc., Merrill Lynch Middle East/Africa Fund,
Inc., Merrill Lynch Municipal Series Trust, Merrill Lynch Pacific Fund, Inc.,
Merrill Lynch Ready Assets Trust, Merrill Lynch Real Estate Fund, Inc.,
Merrill Lynch Retirement Series Trust, Merrill Lynch Series Fund, Inc.,
Merrill Lynch Short-Term Global Income Fund, Inc., Merrill Lynch Strategic
Dividend Fund, Merrill Lynch Technology Fund, Inc., Merrill Lynch U.S.
Treasury Money Fund, Merrill Lynch U.S.A. Government Reserves, Merrill Lynch
Utility Income Fund, Inc. and Merrill Lynch Variable Series Funds, Inc. and
Hotchkis and Wiley Funds (advised by Hotchkis and Wiley, a division of MLAM);
and for the following closed-end registered investment companies: Merrill
Lynch High Income Municipal Bond Fund, Inc. and Merrill Lynch Senior Floating
Rate Fund, Inc. MLAM also acts as subadviser to Merrill Lynch World Strategy
Portfolio and Merrill Lynch Basic Value Equity Portfolio, two investment
portfolios of EQ Advisors Trust.
 
  The address of each of these investment companies is P.O. Box 9011,
Princeton, New Jersey 08543-9011, except that the address of Merrill Lynch
Funds for Institutions Series and Merrill Lynch Intermediate
 
                                      C-3
<PAGE>
 
Government Bond Fund is One Financial Center, 23rd Floor, Boston,
Massachusetts 02111-2646. The address of the Investment Adviser, MLAM, Merrill
Lynch Funds Distributor, Inc. (the "Distributor"), Princeton Services, Inc.
("Princeton Services") and Princeton Administrators, L.P. also is P.O. Box
9011, Princeton, New Jersey 08543-9011. The address of Merrill Lynch, Pierce,
Fenner & Smith Incorporated ("Merrill Lynch") and Merrill Lynch & Co., Inc.
("ML & Co.") is World Financial Center, North Tower, 250 Vesey Street, New
York, New York 10281-1201.
 
  Set forth below is a list of each executive officer and partner of the
Investment Adviser indicating each business, profession, vocation or
employment of a substantial nature in which each such person or entity has
been engaged for the past two years for his or her or its own account or in
the capacity of director, officer, employee, partner or trustee. In addition,
Mr. Zeikel is President, Mr. Richard is Treasurer and Mr. Glenn is Executive
Vice President of all or substantially all of the investment companies
described in the preceding paragraphs and also hold the same positions with
all or substantially all of the investment companies advised by MLAM as they
do with those advised by the Investment Adviser. Messrs. Giordano, Harvey,
Kirstein and Monagle are directors or officers of one or more of such
companies.
 
<TABLE>   
<CAPTION>
                                                    OTHER SUBSTANTIAL BUSINESS,
                               POSITIONS WITH               PROFESSION,
           NAME              INVESTMENT ADVISER       VOCATION OR EMPLOYMENT
           ----              ------------------     ---------------------------
 <C>                      <C>                      <S>
   ML & Co................Limited.Partner          Financial Services Holding
                                                   Company; Limited Partner of
                                                   MLAM
 Princeton Services...... General Partner          General Partner of MLAM
 Arthur Zeikel........... Chairman                 Chairman of MLAM; President
                                                   of MLAM and the Investment
                                                   Adviser (from 1977 to 1997);
                                                   Chairman and Director of
                                                   Princeton Services;
                                                   President of Princeton
                                                   Services (from 1993 to
                                                   1997); Executive Vice
                                                   President of ML & Co.
 Jeffrey M. Peek......... President                President of MLAM; President
                                                   and Director of Princeton
                                                   Services; Executive Vice
                                                   President of ML & Co.
 Terry K. Glenn.......... Executive Vice President Executive Vice President of
                                                   MLAM; Executive Vice
                                                   President and Director of
                                                   Princeton Services;
                                                   President and Director of
                                                   MLFD; Director of MLFDS;
                                                   President of Princeton
                                                   Administrators, L.P.
 Linda L. Federici....... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
 Vincent R. Giordano..... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
 Elizabeth A. Griffin.... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
 Norman R. Harvey........ Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
 Michael J. Hennewinkel.. Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of the MLAM International
                                                   Group
 Philip L. Kirstein...... Senior Vice President,   Senior Vice President,
                           General Counsel and     General Counsel and
                           Secretary               Secretary of MLAM; Senior
                                                   Vice President, General
                                                   Counsel, Director and
                                                   Secretary of Princeton
                                                   Services
 Ronald M. Kloss......... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
 Debra W. Landsman-Yaros. Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services; Vice
                                                   President of MLFD
 Joseph T. Monagle, Jr... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
 Michael L. Quinn........ Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services;
                                                   Managing Director and First
                                                   Vice President of Merrill
                                                   Lynch from 1989 to 1995
 Richard L. Reller....... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services;
                                                   Director of MLFD
 Gerald M. Richard....... Senior Vice President    Senior Vice President and
                           and Treasurer           Treasurer of MLAM; Senior
                                                   Vice President and Treasurer
                                                   of Princeton Services; Vice
                                                   President and Treasurer of
                                                   MLFD
 Gregory D. Upah......... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
 Ronald L. Welburn....... Senior Vice President    Senior Vice President of
                                                   MLAM; Senior Vice President
                                                   of Princeton Services
</TABLE>    
 
                                      C-4
<PAGE>
 
ITEM 31. LOCATION OF ACCOUNT AND RECORDS.
 
  All accounts, books and other documents required to be maintained by Section
31(a) of the Investment Company Act of 1940, as amended, and the rules
promulgated thereunder are maintained at the offices of the registrant (800
Scudders Mill Road, Plainsboro, New Jersey 08536), its investment adviser (800
Scudders Mill Road, Plainsboro, New Jersey 08536), and its custodian and
transfer agent.
 
ITEM 32.  MANAGEMENT SERVICES.
 
  Not applicable.
 
ITEM 33. UNDERTAKINGS.
 
  (a) Registrant undertakes to suspend the offering of the shares of Common
Stock covered hereby until it amends its Prospectus contained herein if (1)
subsequent to the effective date of this Registration Statement, its net asset
value per share of Common Stock declines more than 10 percent from its net
asset value per share of Common Stock as of the effective date of this
Registration Statement, or (2) its net asset value per share of Common Stock
increases to an amount greater than its net proceeds as stated in the
Prospectus contained herein.
 
  (b) Registrant undertakes that:
 
    (1) For purposes of determining any liability under the 1933 Act, the
  information omitted from the form of prospectus filed as part of this
  Registration Statement in reliance upon Rule 430A and contained in the form
  of prospectus filed by the registrant pursuant to Rule 497(h) under the
  1933 Act shall be deemed to be part of this Registration Statement as of
  the time it was declared effective.
 
    (2) For the purpose of determining any liability under the 1933 Act, each
  post-effective amendment that contains a form of prospectus shall be deemed
  to be a new registration statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof.
 
                                      C-5
<PAGE>
 
                                  SIGNATURES
   
  Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant has duly caused this
Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the Township of Plainsboro, and State of New
Jersey, on the 28th day of April, 1998.     
 
                                          MUNIHOLDINGS INSURED FUND, INC,
                                            (Registrant)
                                                   
                                                /s/ GERALD M. RICHARD     
                                          By __________________________________
                                                 
                                              (GERALD M. RICHARD, TREASURER)
                                                               
                                                   
  Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date(s) indicated.
 
<TABLE>    
<S>  <C>
             SIGNATURES                        TITLE
                                                                     DATE
 
           ARTHUR ZEIKEL*              President and
- -------------------------------------   Director (Principal
           (ARTHUR ZEIKEL)              Executive Officer)
 
        /s/ GERALD M. RICHARD          Treasurer (Principal     April 28, 1998
- -------------------------------------   Financial and
         (GERALD M. RICHARD)            Accounting Officer)
 
          RONALD W. FORBES*            Director
- -------------------------------------
         (RONALD W. FORBES)
 
       CYNTHIA A. MONTGOMERY*          Director
- -------------------------------------
       (CYNTHIA A. MONTGOMERY)
 
         CHARLES C. REILLY*            Director
- -------------------------------------
         (CHARLES C. REILLY)
 
           KEVIN A. RYAN*              Director
- -------------------------------------
           (KEVIN A. RYAN)
 
          RICHARD R. WEST*             Director
- -------------------------------------
          (RICHARD R. WEST)
 
        /s/ GERALD M. RICHARD                                   April 28, 1998
  ----------------------------------
*By:
</TABLE>     
(GERALD M. RICHARD, ATTORNEY-IN-FACT)
                                                                        
                                                                         
                                      C-6
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>   
<CAPTION>
 EXHIBIT
 NUMBER
 -------
 <C>     <S>
 (l)     Opinion and Consent of Brown & Wood LLP
 (n)     Consent of Ernst & Young LLP, independent auditors for the Fund
 (p)     Certificate of Fund Asset Management, L.P.
</TABLE>    

<PAGE>
 
                                                                     EXHIBIT (L)


                               BROWN & WOOD LLP
                            One World Trade Center
                         New York, New York 10048-0557
                           Telephone (212) 839-5300
                           Facsimile (212) 839-5599

                                                April 28, 1998

MuniHoldings Insured Fund, Inc.
800 Scudders Mill Road
Plainsboro, New Jersey 08536

Ladies and Gentlemen:

     This opinion is being furnished in connection with the registration by
MuniHoldings Insured Fund, Inc., a Maryland corporation (the "Fund"), of shares
of common stock, par value $0.10 per share (the "Shares"), under the Securities
Act of 1933, as amended (the "Securities Act"), pursuant to the Fund's
registration statement on Form N-2, as amended (the "Registration Statement"),
under the Securities Act, in the amount set forth under "Amount Being
Registered" on the facing page of the Registration Statement.

     As counsel for the Fund, we are familiar with the proceedings taken by it
in connection with the authorization, issuance and sale of the Shares.  In
addition, we have examined and are familiar with the Articles of Incorporation
of the Fund, as amended, the By-Laws of the Fund, and such other documents as we
have deemed relevant to the matters referred to in this opinion.

     Based upon the foregoing, we are of the opinion that the Shares, upon
issuance and sale in the manner referred to in the Registration Statement, will
be legally issued, fully paid and non-assessable shares of common stock of the
Fund.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the use of our name in the Prospectus constituting
a part thereof.


                                     Very truly yours,

                                     /s/ Brown & Wood LLP

<PAGE>
 
                                                                     EXHIBIT (N)



                        CONSENT OF INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated April 23, 1998, in this Registration Statement on Form 
N-2 under the Securities Act of 1933 (File No. 333-48289) and under the
Investment Company Act of 1940 (File No. 811-08707) and related Prospectus of
MuniHoldings Insured Fund, Inc. for the registration of shares of its Common
Stock.



                                                   Ernst & Young LLP


Princeton, New Jersey
April 24, 1998





<PAGE>
 
                                                                     EXHIBIT (P)


                    CERTIFICATE OF THE SOLE STOCKHOLDER OF
                        MUNIHOLDINGS INSURED FUND, INC.

     Fund Asset Management, L.P. ("FAM"), the holder of 6,667 shares of common
stock, par value $0.10 per share, of MuniHoldings Insured Fund, Inc. (the
"Fund"), a Maryland corporation, does hereby confirm to the Fund its
representation that it purchased such shares for investment purposes, with no
present intention of redeeming or reselling any portion thereof, and further
agrees that if it redeems (by tender offer or otherwise) any portion of such
shares prior to the amortization of the Fund's organizational expenses, the
proceeds thereof will be reduced by the proportionate amount of unamortized
organizational expenses which the number of shares being redeemed bears to the
number of shares initially purchased and outstanding at the time of redemption.
FAM further agrees that, in the event such shares are sold or otherwise
transferred to any other party, prior to such sale or transfer FAM will obtain
on behalf of the Fund an agreement from such other party to comply with the
foregoing as to the reduction of redemption proceeds and to obtain a similar
agreement from any transferee of such party.


                         FUND ASSET MANAGEMENT, L.P.

                         By:    /s/ Robert Harris
                               ------------------------------
                              Name: Robert Harris
                              Title:  Assistant Secretary

Dated:  April 28, 1998


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