MANAGED MUNICIPAL FUND INC
N-30D, 2000-06-28
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ISI
INTERNATIONAL STRATEGY & INVESTMENT

                                       ISI
                                MANAGED MUNICIPAL
                                   FUND SHARES
                    (A CLASS OF MANAGED MUNICIPAL FUND, INC.)


                               SEMI-ANNUAL REPORT
                                 APRIL 30, 2000

<PAGE>
INVESTMENT ADVISOR'S REPORT
--------------------------------------------------------------------------------
         We are  pleased to report on the  progress  of your Fund for the period
ended April 30, 2000. The Fund recorded a total return, for the first six months
of the fiscal year of 2.81%.  Since its inception on February 26, 1990, the Fund
has  produced a  cumulative  total return of 80.44%,  which  translates  into an
average annual total return of 5.97%.  These figures assume the  reinvestment of
dividends  and capital gains  distributions  and exclude the impact of any sales
charge.

PORTFOLIO MANAGEMENT

     The Fund emphasizes "top quality" in its municipal bond  investments.  Over
the last six months,  quality yield spread  differentials have opened a bit. But
the  strong  revenue  growth  experienced  by  most  municipalities  has  so far
moderated any spread opening.

     [GRAPH OMITTED]

     plot points as follows:

     10/29/99            32
     11/05/99            33
     11/12/99            41
     11/19/99            44
     11/26/99            37
     12/03/99            39
     12/10/99            38
     12/17/99            35
     12/24/99            39
     12/31/99            39
     01/07/00            40
     01/14/00            40
     01/21/00            39
     01/28/00            38
     02/04/00            41
     02/11/00            44
     02/18/00            49
     02/25/00            51
     03/03/00            51
     03/10/00            53
     03/17/00            56
     03/24/00            57
     03/31/00            64
     04/07/00            65
     04/14/00            52
     04/21/00            50
     04/28/00            50

     ISI expects  the economy  will slow over the second half of the fiscal year
and that will hit medium quality municipals. In this environment, we believe the
Fund's high quality orientation should help its performance.

     The Fund's high quality municipalities have more financial options than the
typically more leveraged medium quality municipalities.  As a result, the Fund's
issues are often  quickly  pre-refunded.  This is an advantage for the Fund in a
rising interest rate environment  because the fund can sell these short maturity
issues and re-deploy the proceeds in the higher  yielding long maturity  market.
The Fund  currently  has almost  22.5% of its assets in  pre-refunded  bonds and
short-term reserves.  As the second half of the fiscal year unfolds, ISI will be
looking  for an  opportunity  to extend the  maturity of the Fund by selling its
short maturity  holdings and investing in the 20-year  maturity range.  For more
information  on the  outlook  for the  economy,  please see ISI's  report  which
follows this letter.

     We would like to welcome our new  investors to the Fund and thank those who
have been with us for some time. We appreciate your confidence.

Sincerely,

/S/SIGNATURE
R. Alan Medaugh
President

May 5, 2000

                                                                               1

<PAGE>

ECONOMIC OUTLOOK FOR 2000
--------------------------------------------------------------------------------

OVERVIEW

     Currently,  we see more negatives than positives for bonds. In establishing
our  position  on bonds,  we look at three  perspectives:  1)  fundamentals,  2)
sentiment,  and 3)  technicals.  Currently,  we  believe  the  fundamentals  and
technicals are negative,  while sentiment is positive. This mix puts us cautious
on bonds. We are watching the "fundamentals"  for a possible change,  given that
our company surveys last week predicted a slow down in the economy, money growth
has been slowing, and commodity prices have weakened.  But strong growth reports
have been dominant so far.  First quarter  nominal growth was reported last week
to be running at an 8.1% annual rate.  Inflation  readings  have also picked up.
The  Employment  Cost Index, a report  closely  watched by the Federal  Reserve,
jumped to a 4.3% annual rate for the first quarter. The pick-up in inflation has
gained  consumer  attention  according to the  University of Michigan  Inflation
Expectation report.  Inflation  expectations are up 100 basis points in the last
year,  implying future  pressure on wage demands.  We expect the Federal Reserve
will  increase  the Federal  Funds rate by 50 basis points in two 25 basis point
moves at the May and June meetings.

U.S. ECONOMY

     Over the last five years a distinct  economic growth pattern has persisted,
with the first quarter of the year strong  relative to the fourth quarter of the
preceding year as illustrated in the following chart.  For seasonal  strength to
continue  for five  years  means the forces  behind the growth are  accelerating
faster than the Bureau of Labor Statistics can adjust their seasonal models.  We
believe the keys to this first  quarter  growth are  accelerating  tax  refunds,
rising bonus payments and home mortgage refinancing windfalls.

     [GRAPH OMITTED]

     plot points as follows:

     12/31/95     2.6
     3/31/96      3.3
     12/31/96     2.9
     3/31/97      4.4
     12/31/97     3.3
     3/31/98      5.8
     12/31/98     4.6
     3/31/99      6.5
     12/31/99     5.9
     3/31/00      7.5

     The  question  is  what's  next.  It  would  seem  that the  first  quarter
acceleration  story suggests growth slows in the second quarter.  However,  that
has not been the case. In the past four years,  second quarter consumer spending
has accelerated half the time. This year there is a special stimulus: the repeal
of the  Social  Security  earnings  test for  workers  aged 65 to 69.  This will
provide  roughly a $1.4  billion  tax cut for the second  quarter,  or almost $6
billion  at an  annual  rate.  So, it is  likely  that this year may see  growth
persist  at a higher  rate into the second  quarter.  As a result,  the  Federal
Reserve will be forced to continue with its increases in short rates.

2

<PAGE>
ECONOMIC OUTLOOK FOR 2000 (CONCLUDED)
--------------------------------------------------------------------------------

     In the second half of 2000,  we expect the Federal  Reserve rate  increases
along  with those of other  Central  Banks  will  begin to dampen  growth.  Also
pointing to lower growth,  money supply  growth,  which leads retail sales,  has
rolled  over in the last month.  Equity  prices have also been flat for the last
four months while exhibiting volatile day to day action. This behavior is likely
to reduce  consumer  confidence.  ISI sees a slow  down  developing  from  these
factors.

FINANCIAL MARKETS

     Strong  growth  in 1999 and a  change  in  Federal  Reserve  policy  pushed
interest rates up from 4.82% to 5.63% on 20-year AAA municipal  bonds.  After an
early 2000 rally,  strong growth and a hawkish  Federal Reserve have again moved
rates  higher.  The stock  market has also played a role in raising  rates.  The
resulting  long-term  build up of consumer  balance sheet wealth has  stimulated
spending,  helping  bolster  economic  growth.  A  year-end  1999  money  growth
acceleration  to  head  off  any  Y2K  problems  most  likely   exacerbated  the
performance of the speculative part of the equity market such as the NASDAQ. The
recent  reversal of the money  acceleration  seemed to have  produced a sizeable
drop in the same  speculative  stock sector.  As a result,  price volatility has
become an important feature in the financial markets.

     Looking ahead, we expect growth to slow in the second half of 2000. This is
likely to cap the Federal  Reserve's  interest rate increases and begin to lower
long-term bond yields.

                                                                               3

<PAGE>

PORTFOLIO DIVERSIFICATION BY STATE
--------------------------------------------------------------------------------

     [GRAPHIC OMITTED]

                                STATE ALLOCATION
--------------------------------------------------------------------------------

                        % of                              % of
                      Municipal                         Municipal
                        Bonds                             Bonds
                      ---------                         ---------
 Texas                 19.5%           South Carolina      4.4%
 North Carolina        11.1            Illinois            2.9
 Washington            11.0            Ohio                2.8
 Florida                6.9            Utah                2.2
 Minnesota              6.0            Colorado            2.0
 Wisconsin              5.5            Missouri            1.9
 Kansas                 5.0            Indiana             1.7
 Virginia               5.0            Oregon              1.6
 Delaware               4.9            Hawaii              0.8
 Tennessee              4.8                             -------
                                       Total             100.0%



Average Maturity              12.8 years
--------------------------------------------------------------------------------
Average Duration               8.3 years
--------------------------------------------------------------------------------
Quality Breakdown:
--------------------------------------------------------------------------------
    AAA                         59%
--------------------------------------------------------------------------------
    AA                          41%
--------------------------------------------------------------------------------

4
<PAGE>

ADDITIONAL PERFORMANCE INFORMATION
--------------------------------------------------------------------------------

     The shareholder letter included in this report contains statistics designed
to help you  evaluate  the  performance  of your Fund's  management.  To further
assist in this evaluation, the Securities and Exchange Commission (SEC) requires
that we include the Fund's total return,  according to a  standardized  formula,
for various time periods through the end of the most recent calendar quarter.

     The SEC standardized  total return figures include the impact of the Fund's
maximum  initial  sales  charge.  Returns  would be  higher  for  investors  who
qualified for a lower initial sales charge.

     The SEC total return  figures may differ from total  return  figures in the
shareholder  letter because the SEC figures  include the impact of sales charges
while the total return figures in the shareholder letter do not. Any performance
figures shown are for the full period  indicated.  Since  investment  return and
principal value will fluctuate,  an investor's  shares may be worth more or less
than their original cost when redeemed.  Past performance is not an indicator of
future results.


--------------------------------------------------------------------------------
                           AVERAGE ANNUAL TOTAL RETURN 1

                                                               % Return with
  Periods ended 4/30/00:                                        Sales Charge
--------------------------------------------------------------------------------
  One Year                                                         (6.52)%
--------------------------------------------------------------------------------
  Five Years                                                        4.13%
--------------------------------------------------------------------------------
  Since Inception (2/26/90)                                         5.46%
--------------------------------------------------------------------------------

1 Past performance is not an indicator of future results. Investment return and
  principal  value will fluctuate so that shares,  when  redeemed,  may be worth
  more or less than their original cost.  These figures assume the  reinvestment
  of  dividends  and capital  gain  distributions  and include the Fund's  4.45%
  maximum  sales  charge.  Returns  would have been lower  during the  specified
  period if certain fees and expenses had not been waived.

--------------------------------------------------------------------------------
     This report is prepared for the general information of shareholders.  It is
authorized  for  distribution  to  prospective  investors  only when preceded or
accompanied by an effective prospectus.

     For more complete  information  regarding  any of the ISI Funds,  including
charges and expenses, obtain a prospectus from your investment representative or
directly from the Fund at 1-800-955-7175. Read it carefully before you invest.
--------------------------------------------------------------------------------

                                                                               5

<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------

STATEMENT OF NET ASSETS
APRIL 30, 2000
(UNAUDITED)

<TABLE>
<CAPTION>
                                                         RATING*
                                                         (MOODY'S/        PAR              MARKET
ISSUER                                                     S&P)          (000)             VALUE
----------------------------------------------------------------------------------------------------
<S>                                                     <C>             <C>             <C>
MUNICIPAL BONDS -- 94.1%
GENERAL OBLIGATIONS -- 67.4%
Arlington County, VA
   5.00%, 10/1/14 ....................................  Aaa/AAA         $2,000          $ 1,906,960
Arlington, TX, School District
   5.75%, 2/15/21 ....................................  AAA/NR           1,465            1,440,447
Charlotte, NC
   5.30%, 4/1/12 .....................................  Aaa/AAA          1,120            1,123,091
   5.00%, 2/1/19 .....................................  Aaa/AAA          2,300            2,095,990
Chesterfield County, VA
   5.625%, 1/15/14 ...................................  Aaa/AAA          1,350            1,374,651
Dallas, TX
   5.00%, 2/15/13 ....................................  Aaa/AAA          1,755            1,661,090
Delaware State, Series A
   5.125%, 4/1/16 ....................................  Aaa/AAA          2,150            2,043,424
   5.50%, 4/1/19 .....................................  Aaa/AAA          2,500            2,456,625
Dupage County, IL, Jail Project
   5.60%, 1/1/21 .....................................  Aaa/AAA          1,600            1,563,488
Florida Board of Education
   6.125%, 6/1/12 ....................................  Aa2/AA+          2,250            2,302,875
Florida State Board Capital Outlay, Series C
   5.50%, 6/1/21 .....................................  Aa2/AA+          2,000            1,927,400
Franklin County, OH
   5.45%, 12/1/09 ....................................  Aaa/AAA          1,500            1,517,910
   5.50%, 12/1/13 ....................................  Aaa/AAA          1,000            1,006,630
Grand Prairie, TX, School District
   5.20%, 2/15/18 ....................................  Aaa/AAA          2,000            1,849,940
King County, WA
   5.20%, 12/1/15 ....................................  Aa1/AA+          2,500            2,350,225
   5.00%, 12/1/17 ....................................  Aa1/AA+          2,565            2,316,862
Metropolitan Government Nashville &
   Davidson County, TN
   5.125%, 11/15/19 ..................................  Aa2/AA           2,000            1,811,200
Minneapolis, MN Refunding, Series B
   5.20%, 3/1/13 .....................................  Aaa/AAA          3,200            3,127,136
</TABLE>

6
<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------
STATEMENT OF NET ASSETS
APRIL 30, 2000
(UNAUDITED)

<TABLE>
<CAPTION>
                                                          RATING*
                                                         (MOODY'S/        PAR           MARKET
ISSUER                                                     S&P)          (000)           VALUE
-----------------------------------------------------------------------------------------------------
<S>                                                     <C>             <C>             <C>
MUNICIPAL BONDS -- (CONTINUED)
GENERAL OBLIGATIONS -- (CONCLUDED)
Minnesota State
   5.00%, 11/1/14 ....................................  Aaa/AAA         $2,500          $ 2,376,150
Missouri State, Series A
   5.00%, 6/1/23 .....................................  Aaa/AAA          2,000            1,783,720
North Carolina State Public Improvement, Series A
   5.25%, 3/1/16 .....................................  Aaa/AAA          1,170            1,130,840
North Carolina Public School Building
   4.60%, 4/1/17 .....................................  Aaa/AAA          5,000            4,333,050
Plano, TX Independent School District
   5.00%, 2/15/11 ....................................  Aaa/AAA          3,000            2,881,200
Portland, OR, Metro Regional Government
   5.25%, 9/1/07 .....................................  Aa/AA+           1,500            1,508,910
Salt Lake County, UT
   5.25%, 12/15/10 ...................................  Aaa/AAA          2,000            1,996,640
South Carolina Capital Improvement
   5.625%, 7/1/14 ....................................  Aaa/AAA          2,700            2,744,847
   5.65%, 7/1/21 .....................................  Aaa/AAA          1,260            1,251,886
Virginia State
   5.25%, 6/1/16 .....................................  Aaa/AAA          1,320            1,278,143
Washington State, Series A
   5.60%, 7/1/10 .....................................  Aa1/AA+          1,500            1,522,530
Washington State, Series E
   5.00%, 7/1/22 .....................................  Aa1/AA+          2,000            1,743,080
Washington State, Series R
   5.00%, 7/1/14 .....................................  Aa1/AA+          2,250            2,096,010
Wisconsin State, Series 1
   5.00%, 5/1/15 .....................................  Aa2/AA           1,000              929,070
Wisconsin State, Series B
   5.00%, 5/1/16 .....................................  Aa2/AA           3,500            3,220,805
   5.00%, 5/1/18 .....................................  Aa2/AA           1,000              904,070
                                                                                        -----------
                                                                                         65,576,895
                                                                                        -----------
</TABLE>

                                                                               7

<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------
STATEMENT OF NET ASSETS
APRIL 30, 2000
(UNAUDITED)

<TABLE>
<CAPTION>
                                                          RATING*
                                                         (MOODY'S/        PAR           MARKET
ISSUER                                                     S&P)          (000)           VALUE
-----------------------------------------------------------------------------------------------------------
<S>                                                     <C>             <C>             <C>
MUNICIPAL BONDS -- (CONTINUED)
OTHER REVENUE -- 4.1%
Charlotte, NC, Water & Sewer System Revenue
   5.25%, 6/1/24 .....................................  Aa2/AA+         $1,600          $ 1,467,072
Texas Water Development Board Revenue
   4.75%, 7/15/20 ....................................  Aa1/AAA          3,000            2,551,440
                                                                                        -----------
                                                                                          4,018,512
                                                                                        -----------
PREREFUNDED ISSUES -- 17.9%
Arlington, TX, School District
   5.75%, 2/15/21 ....................................  Aaa/NR*          3,535            3,642,004
Chicago, IL, Metropolitan Water
   Reclamation District-Greater Chicago
   6.30%, 12/1/09 ....................................  Aa1/AA           1,000            1,058,190
Dallas, TX
   5.00%, 2/15/10 ....................................  Aaa/AAA          1,750            1,747,655
Florida Transportation
   5.80%, 7/1/18 .....................................  Aa2/AAA          2,000            2,087,500
Indianapolis, IN, Public Improvement
   Board Revenue
   6.00%, 1/10/18 ....................................  Aaa/AAA          1,500            1,515,720
Lower Colorado River Authority, Jr. Lien
   5.25%, 1/1/15 .....................................  #AAA/AAA         2,000            1,953,860
State of Hawaii
   7.00%, 6/1/06 .....................................  #AAA/++            750              751,762
Tennessee State,Series A
   5.50%, 3/1/09 .....................................  Aaa/AAA          1,535            1,566,207
   5.55%, 3/1/10 .....................................  Aaa/AAA          1,000            1,022,460
Texas State
   6.00%, 10/1/14 ....................................  Aa1/AA           2,000            2,079,200
                                                                                       ------------
                                                                                         17,424,558
                                                                                       ------------
</TABLE>

8
<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------
STATEMENT OF NET ASSETS (CONTINUED)
APRIL 30, 2000
(UNAUDITED)

<TABLE>
<CAPTION>
                                                          RATING*
                                                         (MOODY'S/        PAR           MARKET
ISSUER                                                     S&P)          (000)           VALUE
----------------------------------------------------------------------------------------------------
<S>                                                     <C>             <C>             <C>
MUNICIPAL BONDS -- (CONCLUDED)
TRANSPORTATION REVENUE -- 4.7%
Kansas Transportation
   5.40%, 3/1/09 .....................................  Aa2/AA+         $4,500          $ 4,533,930
                                                                                        -----------
TOTAL MUNICIPAL BONDS
   (Cost $93,620,423) ................................                                   91,553,895
                                                                                        -----------
REPURCHASE AGREEMENT -- 4.6%
Goldman Sachs & Co., 5.63% Dated 4/28/00, to be
   repurchased for $4,484,000 on 5/1/00,
   collateralized by U.S. Treasury Bonds, 5.625%,
   due 5/15/01 with a market value of $4,559,456
   (Cost $4,470,000) .................................................   4,470          $ 4,470,000
                                                                                       ------------
TOTAL INVESTMENTS -- 98.7%
   (Cost $98,090,423) .............................................................      96,023,895
                                                                                       ------------
OTHER ASSETS IN EXCESS OF LIABILITIES-- 1.3% ......................................       1,291,292
                                                                                       ------------
NET ASSETS-- 100.0% .................................. ............................     $97,315,187
                                                                                       ------------
                                                                                       ------------
NET ASSET VALUE AND REDEMPTION PRICE PER:
  ISI Class Share
    ($65,117,356 / 6,406,082 shares outstanding) ..... ............................          $10.16
                                                                                       ------------
                                                                                       ------------
  Flag Investors Class A Share
    ($32,197,831 / 3,168,116 shares outstanding) ..... ............................          $10.16
                                                                                       ------------
                                                                                       ------------
MAXIMUM OFFERING PRICE PER:
  ISI Class Share
    ($10.16 / 0.9555) ................................ ............................          $10.63
                                                                                       ------------
                                                                                       ------------
  Flag Investors Class A Share
    ($10.16 / 0.9550) .............................................................          $10.64
                                                                                       ------------
                                                                                       ------------
</TABLE>

                                                                               9
<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------
STATEMENT OF NET ASSETS (CONCLUDED)
APRIL 30, 2000
(UNAUDITED)

--------------------------------------------------------------------------------
---------
     *  The Moody's and Standard & Poor's  ratings  indicated are believed to be
        the most recent ratings available as of April 30, 2000.
    ++  Prerefunded bonds backed by U.S. Treasury securities. Absent
        prerefunding, this obligation is rated Aa3/A+.
Moody's Municipal Bond Ratings:
   Aaa  Judged to be of the best quality.
    Aa  Judged to be of high  quality by all standards. Issues are always  rated
        with a 1,2 or 3, which denote a high, medium, or low ranking within the
        rating.
  #AAA  Advance refunded issues secured by escrowed funds held in cash, held in
        a trust or invested in direct  non-callable U.S. government obligations
        or non-callable obligations.
    NR  Not rated.
S&P Municipal Bond Rating:
   AAA  Of the highest quality.
    AA  The second strongest capacity for payments of debt service. Those issues
        determined to possess very strong safety characteristics are denoted
        with a plus (+) sign.
    NR  Not rated.
--------------------------------------------------------------------------------
See Notes to Financial Statements.

10
<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED APRIL 30, 2000
(UNAUDITED)

--------------------------------------------------------------------------------
INVESTMENT INCOME:
     Interest ..................................................  $2,716,190
                                                                  ----------
EXPENSES:
     Investment advisory fee ...................................     200,054
     Distribution fee ..........................................     125,034
     Administration fee ........................................      54,083
     Accounting fee ............................................      27,421
     Professional fees .........................................      27,233
     Transfer agent fee ........................................      24,831
     Registration fees .........................................      22,439
     Printing and Postage ......................................      16,478
     Miscellaneous .............................................       5,086
                                                                  ----------
        Total expenses .........................................     502,659
     Less: Fees waived .........................................     (49,537)
                                                                  ----------
        Net expenses ...........................................     453,122
                                                                  ----------
     Net investment income .....................................   2,263,068
                                                                  ----------
NET REALIZED AND UNREALIZED GAIN/(LOSS) ON INVESTMENTS:
     Net realized loss from security transactions ..............     (74,065)
     Change in unrealized appreciation/depreciation of investments   559,378
                                                                  ----------
     Net gain on investments ...................................     485,313
                                                                  ----------
NET INCREASE IN NET ASSETS RESULTING
 FROM OPERATIONS ...............................................  $2,748,381)
                                                                  ----------
                                                                  ----------
--------------------------------------------------------------------------------
See Notes to Financial Statements.

                                                                              11
<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------

STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                               FOR THE SIX            FOR THE YEAR
                                                               MONTHS ENDED             ENDED
                                                                APRIL 30,             OCTOBER 31,
                                                                 2000(1)                 1999
-----------------------------------------------------------------------------------------------------
<S>                                                            <C>                    <C>
INCREASE/(DECREASE) IN NET ASSETS:
OPERATIONS:

     Net investment income ..................................  $  2,263,068           $  4,818,088
     Net realized gain/(loss) from
        security transactions ...............................       (74,065)               547,939
     Change in unrealized appreciation/
        (depreciation) of investments .......................       559,378             (9,251,142)
                                                               ------------           ------------
     Net increase/(decrease) in net assets
        resulting from operations ...........................     2,748,381             (3,885,115)
                                                               ------------           ------------
DIVIDENDS TO SHAREHOLDERS FROM:
     Net investment income and short-term gains:
        ISI Class Shares ....................................    (1,616,417)            (3,369,957)
        Flag Investors Class A Shares .......................      (774,647)            (1,600,162)
     Net realized long-term gains:
        ISI Class Shares ....................................            --               (312,768)
        Flag Investors Class A Shares .......................            --               (151,301)
                                                               ------------           ------------
     Total distributions ....................................    (2,391,064)            (5,434,188)
                                                               ------------           ------------
CAPITAL SHARE TRANSACTIONS:
     Proceeds from sale of shares ...........................     2,968,448              8,098,100
     Value of shares issued in reinvestment of dividends ....     1,217,931              2,739,411
     Cost of shares repurchased .............................   (11,986,909)           (14,720,429)
                                                               ------------           ------------
     Decrease in net assets derived from
        capital share transactions ..........................    (7,800,530)            (3,882,918)
                                                               ------------           ------------
     Total decrease in net assets ...........................    (7,443,213)           (13,202,221)
NET ASSETS:
     Beginning of period ....................................   104,758,400            117,960,621
                                                               ------------           ------------
     End of period including distributions in excess of net
        investment income of $10,935 for the year end
        October 31, 1999 ....................................  $ 97,315,187           $104,758,400
                                                               ------------           ------------
                                                               ------------           ------------
-----------------------------------------------------------------------------------------------------
<FN>
1 Unaudited.
See Notes to Financial Statements.
</FN>
</TABLE>

12

<PAGE>

MANAGED MUNICIPAL FUND, INC.
--------------------------------------------------------------------------------

FINANCIAL HIGHLIGHTS--ISI CLASS
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                         FOR THE SIX MONTHS
                                           ENDED APRIL 30,           FOR THE YEARS ENDED OCTOBER 31,
---------------------------------------------------------------------------------------------------------------------------
                                                   2000(5)     1999       1998         1997      1996        1995
---------------------------------------------------------------------------------------------------------------------------
<S>                                               <C>         <C>        <C>         <C>        <C>          <C>
PER SHARE OPERATING PERFORMANCE:
   Net asset value at beginning of period .....   $ 10.12     $ 11.01    $ 10.79     $ 10.58    $ 10.65      $ 9.81
                                                 --------    --------   --------    --------   --------     -------
INCOME FROM INVESTMENT OPERATIONS:
   Net investment income ......................      0.23        0.45       0.46        0.52       0.48        0.48
   Net realized and unrealized
     gain/(loss) on investments ...............      0.05       (0.83)      0.33        0.24         --        0.98
                                                 --------    --------   --------    --------   --------     -------
   Total from Investment Operations ...........      0.28       (0.38)      0.79        0.76       0.48        1.46
                                                 --------    --------   --------    --------   --------     -------
LESS DISTRIBUTIONS:
   Net investment income and net realized
     short-term gains .........................     (0.24)      (0.47)     (0.54)      (0.52)     (0.54)      (0.54)
   Net realized long-term gains ...............        --       (0.04)     (0.03)      (0.03)     (0.01)      (0.08)
                                                 --------    --------   --------    --------   --------     -------
   Total distributions ........................     (0.24)      (0.51)     (0.57)      (0.55)     (0.55)      (0.62)
                                                 --------    --------   --------    --------   --------     -------
   Net asset value at end of period ...........   $ 10.16     $ 10.12    $ 11.01     $ 10.79    $ 10.58     $ 10.65
                                                 --------    --------   --------    --------   --------     -------
                                                 --------    --------   --------    --------   --------     -------
TOTAL RETURN 1 ................................      2.81%      (3.61)%     7.51%       7.43%      4.67%      15.42%
RATIOS TO AVERAGE DAILY NET ASSETS:
   Expenses2 ..................................      0.90%4      0.90%      0.90%       0.90%      0.90%       0.90%
   Net investment income3 .....................      4.48%4      4.23%      4.24%       4.46%      4.48%       4.72%
SUPPLEMENTAL DATA:
   Net assets at end of period (000):
      ISI Class Shares ........................   $65,117     $70,609    $80,749     $79,003    $84,712     $86,292
      Flag Investors Class A Shares ...........   $32,198     $34,150    $37,212     $38,390    $41,193     $45,980
   Portfolio turnover rate ....................         9%          8%        18%         26%        32%         55%
---------------------------------------------------------------------------------------------------------------------------
<FN>
1 Total return excludes the effect of sales charge.
2 Without the waiver of advisory and administration  fees (Note B), the ratio of
  expenses to average daily net assets would have been  1.00%(annualized),  1.10%,
  1.13%,  1.10%,  1.13% and 1.10% for the six months ended April 30,2000,  and for
  the years ended October 31, 1999,  1998,  1997, 1996 and 1995,  respectively.
3 Without the waiver of advisory  and  administration  fees (Note B), the ratio of
  net investment income to average daily net assets would have been 4.03%,  4.01%,
  4.26%,  4.25% and 4.52% for the years ended April 30, 2000, 1998, 1997, 1996 and
  1995,   respectively.
4 Annualized.
5 Unaudited.
</FN>
</TABLE>

See  Notes  to  Financial Statements.

                                                                              13

<PAGE>

NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

   A.SIGNIFICANT  ACCOUNTING  POLICIES  -- Managed  Municipal  Fund,  Inc.  (the
     "Fund"),  which was organized as a Maryland  Corporation on January 5, 1990
     and began operations  February 26, 1990, is registered under the Investment
     Company  Act of  1940  as a  diversified,  open-end  management  investment
     company.  It is  designed  to  provide a high  level of total  return  with
     relative stability of principal as well as the secondary  objective of high
     current income through  investment in a portfolio  consisting  primarily of
     municipal obligations,  the interest on which is exempt from federal income
     tax.

     The Fund consists of two share classes:  ISI Managed  Municipal Fund Shares
     ("ISI Class Shares"),  which began  operations  February 26, 1990, and Flag
     Investors  Managed  Municipal Fund Class A Shares ("Flag  Investors Class A
     Shares"), which began operations October 23, 1990.

     The ISI Class Shares have a 4.45%  maximum  front-end  sales charge and the
     Flag Investors Class A Shares have a 4.50% maximum  front-end sales charge.
     Both classes have a 0.25% distribution fee.

     When preparing the Fund's financial statements,  management makes estimates
     and assumptions to comply with accounting  principles generally accepted in
     the UnitedStates. These estimates affect 1) the assets and liabilities that
     we report at the date of the financial statements; 2) the contingent assets
     and liabilities  that we disclose at the date of the financial  statements;
     and 3) the  revenues  and  expenses  that we  report  for the  period.  Our
     estimates  could  be  different  from the  actual  results.  Under  certain
     circumstances,  it is necessary to  reclassify  prior year  information  in
     order  to  conform  to  the  current  year's   pre-sentation.   The  Fund's
     significant accounting policies are:

     SECURITY  VALUATION  --  Municipal  obligations  are usually  traded in the
     over-the-counter market.

     The Fund utilizes the services of an  independent  pricing vendor to obtain
     prices.  When there is an  available  market  quotation,  the Fund values a
     municipal  obligation  by  using  the  most  recent  price  provided  by an
     investment dealer.  When a market quotation is not readily  available,  the
     Investment  Advisor determines a fair value using procedures that the Board
     of  Directors  establishes  and  monitors.  At April 30, 2000 there were no
     Board  Valued  Securities.  The Fund  values  short-term  obligations  with
     maturities  of 60 days or less at amortized  cost which  approximates  fair
     market value.

     REPURCHASE  AGREEMENTS  -- The Fund may  enter  into  tri-party  repurchase
     agreements with  broker-dealers and domestic banks. A repurchase  agreement
     is a short-term  investment in which the Fund buys a debt security that the
     broker agrees to repurchase at a set time and price. The third party, which
     is the broker's  custodial bank, holds the collateral in a separate account
     until the  repurchase  agreement  matures.  The agreement  ensures that the
     collateral's market value, including any accrued interest, is sufficient if
     the broker defaults.  The Fund's access to the collateral may be delayed or
     limited if the broker defaults and the value of the collateral  declines or
     if the broker enters into an insolvency proceeding.

     FEDERAL INCOME TAXES -- The Fund determines its distributions  according to
     income tax  regulations,  which may be different  from  generally  accepted
     accounting   principles.   As  a  result,   the  Fund  occasionally   makes
     reclassifications  within its capital  accounts to reflect income and gains
     that are available for distribution under income tax regulations.

     The Fund is  organized  as a regulated  investment  company.  As long as it
     maintains this status and distributes to its shareholders substantially all
     of its taxable net investment  income and net realized  capital  gains,  it
     will be exempt from most, if not all, federal income and excise taxes. As a
     result, the Fund has made no provisions for federal income taxes.

14

<PAGE>

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
--------------------------------------------------------------------------------

     SECURITY  TRANSACTIONS,  INVESTMENT INCOME,  DISTRIBUTIONS AND OTHER -- The
     Fund uses the trade  date to  account  for  security  transactions  and the
     specific  identification cost method for financial reporting and income tax
     purposes to  determine  the gain or loss of  investments  sold or redeemed.
     Interest  income is recorded on an accrual basis and includes  amortization
     of premiums and accretion of discounts when appropriate.  Income and common
     expenses are  allocated to each class based on its  respective  average net
     assets.  Class  specific  expenses  are  charged  directly  to each  class.
     Dividend  income and  distributions  to  shareholders  are  recorded on the
     ex-dividend date.

   B.INVESTMENT  ADVISORY FEES,  TRANSACTIONS  WITH AFFILIATES AND OTHER FEES --
     International  Strategy & Investment Inc. ("ISI") is the Fund's  investment
     advisor.  As compensation for its advisory  services,  the Fund pays ISI an
     annual  fee  based on the  Fund's  average  daily net  assets.  This fee is
     calculated  daily and paid monthly at the annual rate of 0.40%. For the six
     month period ended April 30, 2000, ISI's advisory fee was $200,054 of which
     $32,443 was payable at the end of the period.

     ISI has  contractually  agreed to waive its fees through February 28, 2001,
     to the extent  necessary,  so that the Fund's annual expenses do not exceed
     0.90% of its average daily net assets. For the six month period ended April
     30, 2000, ISI waived fees of $49,537.

     Investment Company Capital Corp. ("ICCC") is the Fund's  Administrator.  As
     compensation for its administrative  services, the Fund pays ICCC an annual
     fee based on the combined  assets of the ISI Funds and is calculated  daily
     and paid  monthly at the  following  annual  rates:  0.20% of the first $75
     million,  0.15%  of the next $75  million,  0.10% of the next $75  million,
     0.05% of the next $275 million, and 0.03% of the amount over $500 million.

     Certain  officers and  directors of the Fund are also officers or directors
     of ISI or ICCC.

     ICCC provides accounting services, to the Fund for which the Fund pays ICCC
     an annual fee that is calculated daily and paid monthly based on the Fund's
     average  daily net assets.  For the six month  period ended April 30, 2000,
     ICCC's  fee was  $27,421,  of which  $4,499  was  payable at the end of the
     period.

     ICCC also provides  transfer  agent services to the Fund for which the Fund
     pays ICCC a per account fee that is calculated  and paid  monthly.  For the
     six month  period ended April 30,  2000,  ICCC's fee was $24,831,  of which
     $3,614 was payable at the end of the period.

     ISI Group  Inc.  ("ISI  Group"),  which is  affiliated  with ISI,  provides
     distribution  services for the ISI class of the Fund for which ISI Group is
     paid an annual fee,  pursuant to Rule 12b-1,  that is calculated  daily and
     paid  monthly at an annual  rate  equal to 0.25% of the ISI Class'  average
     daily net assets.

     ICC  Distributors,  Inc.  ("ICC  Distributors"),  a  member  of  the  Forum
     Financial Group of companies,  provides  distribution services for the Flag
     Investors  Class A Shares for which ICC  Distributors is paid an annual fee
     that is calculated  daily and paid monthly at an annual rate equal to 0.25%
     of the Flag Investors Class A Shares' average daily net assets.

     For the six month period ended April 30, 2000, distribution fees aggregated
     $125,034.  ISI group's fee was $84,526, of which $13,582 was payable at the
     end of the period.  ICC Distributor's fee was $40,508,  of which $6,696 was
     payable at the end of the period.

                                                                              15

<PAGE>

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
--------------------------------------------------------------------------------

   C.CAPITAL  SHARE  TRANSACTIONS  -- The Fund is  authorized  to issue up to 55
     million  shares of $.001 par value capital stock (20 million ISI Class,  15
     million Flag  Investors  Class A, 2.5 million  Class B, 15 million Class C,
     0.5 million Class D and 2 million undesignated).  Transactions in shares of
     the Fund are listed in the chart below:

                                  ISI CLASS SHARES
                      ---------------------------------------
                          FOR THE SIX           FOR THE
                          MONTHS ENDED         YEAR ENDED
                         APRIL 30, 20001      OCT. 31, 1999
                      ---------------------------------------

 Shares sold ...........       70,594            261,822
 Shares issued to share-
   holders on reinvest-
   ment of dividends ...       74,603            163,148
 Shares redeemed .......     (713,562)          (786,574)
                          -----------        -----------
 Net decrease in shares
   outstanding .........     (568,365)          (361,604)
                          -----------        -----------
                          -----------        -----------
 Proceeds from sale
   of shares ...........  $   710,860        $ 2,797,892
 Value of reinvested
   dividends ...........      752,771          1,747,918
 Cost of shares
   redeemed ............   (7,190,584)        (8,384,868)
                          -----------        -----------
 Net decrease from
   capital share
   transactions ........  $(5,726,953)       $(3,839,058)
                          -----------        -----------
                          -----------        -----------


                         FLAG INVESTORS CLASS A SHARES
                      ---------------------------------------
                          FOR THE SIX           FOR THE
                          MONTHS ENDED         YEAR ENDED
                         APRIL 30, 20001      OCT. 31, 1999
                      ---------------------------------------
 Shares sold ...........      222,913            490,026
 Shares issued to share-
   holders on reinvest-
   ment of dividends ...       46,086             92,630
 Shares redeemed .......     (474,778)          (590,052)
                          -----------        -----------
 Net decrease in shares
   outstanding .........     (205,779)            (7,396)
                          -----------        -----------
                          -----------        -----------
 Proceeds from sale
   of shares ...........   $2,257,587        $ 5,300,208
 Value of reinvested
   dividends ...........      465,160            991,493
 Cost of shares
   redeemed ............   (4,796,324)        (6,335,561)
                          -----------        -----------
 Net decrease from
   capital share
   transactions ........  $(2,073,577)       $   (43,860)
                          -----------        -----------
                          -----------        -----------
-------------------
1 Unaudited.

16

<PAGE>

NOTES TO FINANCIAL STATEMENTS (CONCLUDED)
--------------------------------------------------------------------------------

   D.INVESTMENT TRANSACTIONS -- Excluding short-term  obligations,  purchases of
     investment   securities  aggregated  $8,681,400  and  sales  of  investment
     securities aggregated $15,547,882 for the period ended April 30, 2000.

     On April 30, 2000, aggregate net unrealized  depreciation over tax cost for
     portfolio   securities  was  $2,066,528  of  which  $1,061,387  related  to
     appreciated securities and $3,127,915 related to depreciated securities.

   E. NET ASSETS -- On April 30, 2000, net assets consisted of:

     Paid-in capital:
       ISI Class Shares .....................   $67,518,820
       Flag Investors
           Class A Shares ...................    32,075,889
     Distributions in excess of
       net investment income ................      (138,930)
     Undistributed net realized loss
       from investment transactions(74,064)
     Unrealized depreciation
       of investments .......................    (2,066,528)
                                                -----------
                                                $97,315,187
                                                -----------
                                                -----------

                                                                              17

<PAGE>

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<PAGE>
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<PAGE>

                                       ISI
                                     MANAGED
                                    MUNICIPAL
                                   FUND SHARES
--------------------------------------------------------------------------------
DIRECTORS AND OFFICERS

Edward S. Hyman                         Margaret M. Beeler
CHAIRMAN                                ASSISTANT VICE PRESIDENT
R. Alan Medaugh                         Suzanne H. Ughetta
PRESIDENT                               ASSISTANT VICE PRESIDENT
Joseph R. Hardiman                      Keith C. Reilly
DIRECTOR                                ASSISTANT VICE PRESIDENT
Louis E. Levy                           Charles A. Rizzo
DIRECTOR                                TREASURER
Carl W. Vogt, Esq.                      Felicia A.Emry
DIRECTOR                                SECRETARY
Nancy Lazar                             Amy M. Olmert
VICE PRESIDENT                          ASSISTANT SECRETARY
Edward J. Veilleux                      Daniel O. Hirsch
VICE PRESIDENT                          ASSISTANT SECRETARY
Carrie L. Butler
VICE PRESIDENT


INVESTMENT OBJECTIVE

A mutual  fund  designed to provide a high level of total  return with  relative
stability of principal and, secondarily,  high current income through investment
in a portfolio  consisting primarily of municipal  obligations,  the interest on
which is exempt from federal income tax.

INVESTMENT ADVISOR
--------------------------------------------------------------------------------
ISI Inc.
535 Madison Avenue, 30th Floor
New York, NY 10022
(800) 955-7175

SHAREHOLDER SERVICING AGENT
--------------------------------------------------------------------------------
Investment Company Capital Corp.
P.O. Box 219426
Kansas City, MO 64121-9426
(800) 882-8585

DISTRIBUTOR
--------------------------------------------------------------------------------
ISI Group, Inc.
535 Madison Avenue, 30th Floor
New York, NY 10022
(800) 955-7175/p


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