MANAGED MUNICIPAL FUND INC
N-30D, 1999-07-07
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- --------------------------------------------------------------------------------
Investment Advisor's Report
- --------------------------------------------------------------------------------

     We are pleased to report on the progress of your Fund for the period ended
April 30, 1999. As of this date, the Fund recorded a 12-month total return of
6.5%. Since its inception on February 26, 1990, the Fund has produced a
cumulative total return of 84.44%, which translates into an average annual total
return of 6.9%. These figures assume the reinvestment of dividends and capital
gains distributions and exclude the impact of any sales charge. Please see the
"ISI Economic Outlook" section for further details.

Overview

     The general level of municipal rates moved marginally lower over the last
12 months, down about 15 basis points. The last year however was volatile. In
conjunction with Treasuries, Municipal yields fell to their lowest levels in
early October. In the following months, influenced by strong economic growth,
rates climbed (Municipals rose 35 basis points). Currently, rates are above the
average for the last year even though inflation is very low. Please see chart
below.


                       Fair Market Yield Curves -- History

                                   [GRAPHIC]

In the printed version of the document, a line graph appears which depicts the
following plot points:


                       FAIR MARKET YIELD CURVES - HISTORY

                              4/30/98                  4/30/99
                         U.S. Treasury Yield      U.S. Treasury Yield
                             < 6% Coupon              < 6% Coupon

3 MO ..................       5.10                      4.63
6 MO ..................       5.37                      4.74
1 YR ..................       5.55                      4.96
2 YR ..................       5.58                      5.09
3 YR ..................       5.64                      5.18
4 YR ..................       5.68                      5.28
5 YR ..................       5.66                      5.22
7 YR ..................       5.72                      5.42
8 YR ..................       5.75                      5.43
9 YR ..................       5.75                      5.41
10 YR .................       5.68                      5.32
15 YR .................       5.92                      5.77
20 YR .................       6.03                      5.93
25 YR .................       6.04                      5.90
30 YR .................       5.96                      5.71


     Looking over the last five years, yields on high quality long term
municipal bonds have fallen from 6.09% in April 1994 to 4.97% currently. The
fund's long average maturity has meant its total return (income plus capital
appreciation) has been 6.76%. This compares favorably with the average yield
over the period of 5.48%. However, after this long period of generally declining
rates, the fund has been forced to trim its dividend rate from 4.5 cents per
month to 4.0 cents per month. The fund's dividend payout policy is a
conservative one and this corresponds with the fund's generally conservative
investment approach which stresses high credit quality.

Top Quality Has Value

     The yield on top grade municipals is close to the yield on moderate quality
bonds. Three years ago, the yield spread between AAA and BBB was 80 basis
points; currently the difference has narrowed to 37 basis points. Given the
volatile nature of the economy today, ISI sees good investment value in the best
grade municipal bonds. Please see the table below for the recent relationship
between top and medium grade municipals.

                       Yield Spread between long maturity
                           AAA and BBB Municipal Bonds
                          Yield on BBB minus AAA G.O.'s
- --------------------------------------------------------------------------------
              4/95      4/96       4/97       4/98       4/99
- --------------------------------------------------------------------------------
            + 60 bp   + 80 bp    + 70 bp    + 35 bp    + 37 bp


                                                                               1

<PAGE>

- --------------------------------------------------------------------------------
Investment Advisor's Report
- --------------------------------------------------------------------------------

Value of Long Maturity Municipals

     The recent increase in yield on long term municipal bonds has pushed up
their relative yield versus Treasuries while the relative yield on shorter
maturity issues has fallen. Please see the table below for a year-to-year
comparison.

                % of Treasury Yield for Same Maturity Municipals

      Maturity                April, 1999                April, 1998
- --------------------------------------------------------------------------------
       5 year                    72.7%                      75.1%
      10 year                    77.5%                      80.0%
      20 year                    82.9%                      84.5%
      30 year                    87.8%                      86.4%

     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/ R. Alan Medaugh
- -------------------
R. Alan Medaugh
President



May 7, 1999

- --------------------------------------------------------------------------------
Economic Outlook for 1999
- --------------------------------------------------------------------------------

Overview

     ISI expects U.S. real Gross Domestic Product (GDP) to slow to 3% over the
rest of 1999. In a global context, we expect Japan, the World's second largest
economy to remain weak under the weight of declining employment and capital
expenditures. In each of the last three years, after a growth scare, yields on
long term Treasuries have declined. ISI expects this year's slowing of the U.S.
economy to produce a similar interest rate decline.

U.S. Economy

     Since the start of last year's strong fourth quarter, oil prices are up by
$3 per barrel, bond yields are up by 1% and home mortgage refinancing activity
has declined by roughly 65%. As a result of these changes, we expect the U.S. to
slow down.

     Already the U.S. economy's performance has begun to slow its rate of
growth. Activity is still at a very high level, but momentum is slowing, as can
be seen by the year-on-year slowdowns in employment, help-wanted ads, home
sales, consumer sentiment, and nondefense capital goods orders. Please see graph
below of Existing Home Sales which shows the change of momentum in this strong
part of the economy.


               U.S. EXISTING HOME SALES 3 Mo. Avg. Y/Y % Mar 8.2%


                                   [GRAPHIC]

In the printed version of the document, a line graph appears which depicts the
following plot points:


                                                      U.S. Existing
                                                        Home Sales
                                                     3 Mo. Avg. Y/Y%
                                                     ---------------
        31-Jan-88....................................     -14.5
        29-Feb-88....................................     -13.7
        31-Mar-88....................................      -9.9
        30-Apr-88....................................      -6.9
        31-May-88....................................      -4.0
        30-Jun-88....................................       0.8
        31-Jul-88....................................       3.0
        31-Aug-88....................................       6.8
        30-Sep-88....................................       7.1
        31-Oct-88....................................       8.1
        30-Nov-88....................................       8.5
        31-Dec-88....................................      12.0
        31-Jan-89....................................      14.3
        28-Feb-89....................................      13.3
        31-Mar-89....................................       7.2
        30-Apr-89....................................      -1.3
        31-May-89....................................      -7.7
        30-Jun-89....................................     -12.3
        31-Jul-89....................................     -12.5
        31-Aug-89....................................     -10.1
        30-Sep-89....................................      -5.9
        31-Oct-89....................................      -3.8
        30-Nov-89....................................      -3.2
        31-Dec-89....................................      -6.9
        31-Jan-90....................................      -4.5
        28-Feb-90....................................      -4.4
        31-Mar-90....................................      -0.3
        30-Apr-90....................................      -0.1
        31-May-90....................................       2.6
        30-Jun-90....................................       2.8
        31-Jul-90....................................       1.9
        31-Aug-90....................................       0.2
        30-Sep-90....................................      -4.4
        31-Oct-90....................................      -7.4
        30-Nov-90....................................     -10.9
        31-Dec-90....................................     -11.7
        31-Jan-91....................................     -15.1
        28-Feb-91....................................     -14.6
        31-Mar-91....................................     -12.6
        30-Apr-91....................................      -5.2
        31-May-91....................................       0.1
        30-Jun-91....................................       3.9
        31-Jul-91....................................       3.8
        31-Aug-91....................................      -1.0
        30-Sep-91....................................      -1.2
        31-Oct-91....................................      -2.1
        30-Nov-91....................................       0.5
        31-Dec-91....................................       3.7
        31-Jan-92....................................       8.0
        29-Feb-92....................................      13.3
        31-Mar-92....................................      14.3
        30-Apr-92....................................      12.1
        31-May-92....................................       5.6
        30-Jun-92....................................       2.0
        31-Jul-92....................................       1.1
        31-Aug-92....................................       3.0
        30-Sep-92....................................       5.1
        31-Oct-92....................................       9.0
        30-Nov-92....................................      14.3
        31-Dec-92....................................      19.5
        31-Jan-93....................................      16.5
        28-Feb-93....................................      10.6
        31-Mar-93....................................       2.2
        30-Apr-93....................................      -0.2
        31-May-93....................................       0.9
        30-Jun-93....................................       4.9
        31-Jun-93....................................       9.2
        31-Aug-93....................................      14.1
        30-Sep-93....................................      15.5
        31-Oct-93....................................      13.4
        30-Nov-93....................................      12.2
        31-Dec-93....................................      11.1
        31-Jan-94....................................      13.2
        28-Feb-94....................................      12.0
        31-Mar-94....................................      14.5
        30-Apr-94....................................      15.5
        31-May-94....................................      17.3
        30-Jun-94....................................      13.0
        31-Jul-94....................................       6.7
        31-Aug-94....................................       1.9
        30-Sep-94....................................      -1.2
        31-Oct-94....................................      -2.1
        30-Nov-94....................................      -5.9
        31-Dec-94....................................      -9.2
        31-Jan-95....................................     -10.1
        28-Feb-95....................................      -9.5
        31-Mar-95....................................      -8.4
        30-Apr-95....................................     -11.8
        31-May-95....................................     -12.1
        30-Jun-95....................................      -9.6
        31-Jul-95....................................      -2.7
        31-Aug-95....................................       3.2
        30-Sep-95....................................       5.9
        31-Oct-95....................................       9.1
        30-Nov-95....................................      10.0
        31-Dec-95....................................       9.2
        31-Jan-96....................................       8.7
        29-Feb-96....................................      10.0
        31-Mar-96....................................      12.0
        30-Apr-96....................................      18.6
        31-May-96....................................      19.4
        30-Jun-96....................................      16.3
        31-Jul-96....................................      10.7
        31-Aug-96....................................       5.0
        30-Sep-96....................................       3.5
        31-Oct-96....................................       0.2
        30-Nov-96....................................       0.1
        31-Dec-96....................................       1.8
        31-Jan-97....................................       2.9
        28-Feb-97....................................       3.2
        31-Mar-97....................................       1.7
        30-Apr-97....................................      -1.1
        31-May-97....................................      -1.9
        30-Jun-97....................................       0.1
        31-Jul-97....................................       2.2
        31-Aug-97....................................       3.9
        30-Sep-97....................................       6.4
        31-Oct-97....................................       9.4
        30-Nov-97....................................       9.9
        31-Dec-97....................................      10.1
        31-Jan-98....................................       8.2
        28-Feb-98....................................      10.9
        31-Mar-98....................................      14.3
        30-Apr-98....................................      18.0
        31-May-98....................................      17.1
        30-Jun-98....................................      16.0
        31-Jul-98....................................      15.8
        31-Aug-98....................................      15.3
        30-Sep-98....................................      11.7
        31-Oct-98....................................       8.0
        30-Nov-98....................................       9.5
        31-Dec-98....................................      11.3
        31-Jan-99....................................      12.9
        28-Feb-99....................................      10.2
        31-Mar-99....................................       7.8


2

<PAGE>

- --------------------------------------------------------------------------------
Economic Outlook for 1999 (continued)
- --------------------------------------------------------------------------------

     The above mentioned swings, plus the change from tax refunds to April 15
tax payments, are likely to slow U.S. growth to 3% going forward. The shift to
slower growth is likely to produce lower U.S. interest rates.

Inflation

     ISI expects U.S. inflation to be under 1.25% for 1999. A large part of the
good inflation news comes from restrained wage growth and high worker
productivity. The U.S. recently reported its Employment Cost Index (ECI)
registered a low 0.4% increase (1.6% annual rate) for the first quarter. The
U.S. slowdown in labor costs is also being echoed in a number of other economies
around the world. For example, average hourly earnings are in slowing trends in
the UK, Australia, France, and Italy. Average monthly wages are down 1.7% year
to year in Japan. In Singapore, 60% of companies plan to freeze staff wages.
Wages respond with a lag. So, the global slump in 1998 may be slowing wages in
1999. In addition, restructurings and mergers in the U.S., Europe, and now Japan
are putting labor on the defensive. A global slowdown in wage inflation seems to
be unfolding and this would result in very low inflation reports. Low inflation
means that real interest rates, what's left after deducting inflation from a
bond's yield, will be high even if long term Treasury rates drop.

World Economy

     ISI expects only moderate world growth in 1999. For example, prices in
Japan are declining on all fronts, i.e. consumer prices, wages, property prices,
and rents. In the face of this deflation, employment is also declining, down
250,000 month-to-month in March alone, which would be the equivalent of a
500,000 drop in our monthly employment report, i.e. a stunning plunge. There are
clear growth positives emerging for Japan, most notably, permanent cuts in tax
rates and zero interest rates. But these are likely to be offset by declining
employment, pay cuts, and cuts in capital expenditures. Japan's government is
encouraging restructurings. Indeed, another step in that direction was taken
recently when the government announced it was putting together "a package of
bills to promote corporate restructuring and eliminate excess capacity." The
government also approved a plan recently calling for a decade-long freeze on its
hiring of new workers. The plan's objective is to cut government employment by
250,000 over the next 10 years. The world's second largest economy looks likely
to experience another year of sub-par growth, setting a subdued tone for Asia in
general.

     Looking out a year, stronger growth is possible after a prolonged series of
Central Bank easings (134 over the last 7 months). The stock markets are
performing well around the world, reflecting a long term optimism about growth
but the near term difficulties sighted above are likely to produce sluggish
growth in 1999. We will be using our proprietary surveys of U.S. companies and
international economic reports to monitor changes in global growth prospects.

                                                                               3

<PAGE>

- --------------------------------------------------------------------------------
Portfolio Diversification by State
- --------------------------------------------------------------------------------

                                   [GRAPHIC]


                                State Allocation


                   % of                                     % of
                 Municipal                                Municipal
                   Bonds                                    Bonds
- --------------------------------------------------------------------------------
Texas              15.9%                 Maryland           2.9%
Virginia           12.0                  Illinois           2.6
North Carolina     11.6                  Ohio               2.4
Minnesota           8.7                  Delaware           2.0
Kansas              6.2                  Utah               1.9
Florida             6.0                  Missouri           1.8
South Carolina      5.2                  Indiana            1.4
Wisconsin           5.0                  Oregon             1.4
Washington          4.6                  Hawaii             0.7
Tennessee           4.3                                   -----
Georgia             3.4                  Total            100.0%

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.

- --------------------------------------------------------------------------------
                           AVERAGE ANNUAL TOTAL RETURN
                                                            % Return with
  Periods ended 3/31/99:                                     Sales Charge
- --------------------------------------------------------------------------------
  One Year                                                       0.86%
- --------------------------------------------------------------------------------
  Five Years                                                     5.79%
- --------------------------------------------------------------------------------
  Since Inception (2/26/90)                                      6.39%
- --------------------------------------------------------------------------------

     While the total return figures are required by SEC rules, such comparisons
are of limited utility since the Fund's total return is adjusted for sales
charges and expenses while the total return of the indices are not. In fact, if
you wished to replicate the total return of these indices, you would have to
purchase the securities they represent, an effort that would require a
considerable amount of money and would incur expenses that are not reflected in
the index results.

     The SEC total return figures may differ from total return figures in the
shareholder letter because the time periods may be different and 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,
and investor's shares may be worth more or less than their original cost when
redeemed. Past performance is not an indicator of future results.

     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, 1999
(Unaudited)

<TABLE>
<CAPTION>
                                                                  Rating*
                                                                 (Moody's/      Par       Market
Issuer                                                             S&P)        (000)       Value
- ---------------------------------------------------------------------------------------------------
<S>                                                              <C>         <C>       <C>
Municipal Bonds: 95.8%
General Obligations -- 71.4%
Arlington County, VA
   5.00%, 10/1/14 ............................................   Aaa/AAA     $2,000     $ 2,050,700
Arlington, TX, School District
   5.75%, 2/15/21 ............................................   AAA/NR**     1,465       1,536,038
Charlotte, NC
   5.30%, 4/1/11 .............................................   Aaa/AAA      1,590       1,680,519
   5.30%, 4/1/12 .............................................   Aaa/AAA      3,445       3,630,065
Dallas, TX
   5.00%, 2/15/10 ............................................   Aaa/AAA      1,750       1,838,655
   5.00%, 2/15/13 ............................................   Aaa/AAA      1,755       1,783,168
Delaware State, Series "A"
   5.125%, 4/1/16 ............................................   Aa1/AA+      2,150       2,180,659
Dupage County, IL, Jail Project
   5.60%, 1/1/21 .............................................   Aaa/AAA      1,600       1,719,392
Florida Board of Education
   6.125%, 6/1/12 ............................................   Aa2/AA+      2,250       2,408,693
Florida Board of Education
   5.50%, 6/1/21 .............................................   Aa2/AA+      2,000       2,064,980
Franklin County, OH
   5.45%, 12/1/09 ............................................   Aaa/AAA      1,500       1,618,695
   5.50%, 12/1/13 ............................................   Aaa/AAA      1,000       1,068,470
Georgia State Series "D"
   5.25%, 8/1/09 .............................................   Aaa/AAA      1,580       1,703,287
   5.00%, 8/1/10 .............................................   Aaa/AAA      2,000       2,101,840
Grand Prairie, TX, School District
   5.20%, 2/15/18 ............................................   Aaa/AAA      2,000       2,017,140
King County, WA
   5.20%, 12/1/15 ............................................   Aa1/AA+      2,500       2,559,875
   5.00%, 12/1/17 ............................................   Aa1/AA+      2,565       2,555,663
Maryland State & Local Facilities,
   Second Series
   5.125%, 10/15/10 ..........................................   Aaa/AAA      3,000       3,168,090
Metropolitan Government Nashville &
   Davidson County, TN
   5.125%, 11/15/19 ..........................................   Aa2/AA       2,000       1,988,640
</TABLE>


6

<PAGE>

- --------------------------------------------------------------------------------
Managed Municipal Fund, Inc.
- --------------------------------------------------------------------------------

Statement of Net Assets (continued)
April 30, 1999
(Unaudited)

<TABLE>
<CAPTION>
                                                                  Rating*
                                                                 (Moody's/      Par       Market
Issuer                                                             S&P)        (000)       Value
- ---------------------------------------------------------------------------------------------------
<S>                                                              <C>         <C>       <C>

General Obligations -- continued
Minneapolis, MN Ref - Series "B"
   5.20%, 3/1/13 .............................................   Aaa/AAA     $3,200     $ 3,314,976
Minneapolis, MN, Sports Arena Project
   5.00%, 10/1/11 ............................................   Aaa/AAA      1,710       1,772,176
Minneapolis, MN, Sports Arena Project
   5.00%, 10/1/12 ............................................   Aaa/AAA      1,920       1,979,846
Minnesota State
   5.00%, 11/1/14 ............................................   Aaa/AAA      2,500       2,545,375
Missouri State Series "A"
   5.00%, 6/1/23 .............................................   Aaa/AAA      2,000       1,983,320
North Carolina Public School Building
   4.60%, 4/1/17 .............................................   Aaa/AAA      5,000       4,810,700
Plano, TX Independent School District
   5.00%, 2/15/11 ............................................   Aaa/AAA      3,000       3,036,720
Portland, OR, Metro Regional
   Government Ult
   5.25%, 9/1/07 .............................................     Aa/AA+     1,500       1,582,470
Salt Lake County, UT
   5.25%, 12/15/10 ...........................................   Aaa/AAA      2,000       2,120,260
South Carolina Capital Improvement
   5.00%, 3/1/09 .............................................   Aaa/AAA      2,700       2,824,443
   5.625%, 7/1/14 ............................................   Aaa/AAA      2,700       2,911,248
Tennessee State
   5.50%, 3/1/09 .............................................   Aaa/AAA      1,535       1,653,702
   5.55%, 3/1/10 .............................................   Aaa/AAA      1,000       1,079,910
Washington State:
   Series "A" 5.60%, 7/1/10 ..................................    Aa1/AA+     1,500       1,597,980
   Series "E" 5.00%, 7/1/22 ..................................    Aa1/AA+     2,000       1,948,980
   Series "R" 5.00%, 7/1/14 ..................................    Aa1/AA+     2,250       2,275,425
Wisconsin State:
Series "1" 5.00%, 5/1/15 .....................................    Aa2/AA      1,000       1,006,460
   Series "B" 5.00%, 5/1/16 ..................................    Aa2/AA      3,500       3,510,045
   Series "B" 5.00%, 5/1/18 ..................................    Aa2/AA      1,000         989,120
                                                                                   ----------------
                                                                                         82,617,725
                                                                                   ----------------
</TABLE>


                                                                               7

<PAGE>

- --------------------------------------------------------------------------------
Managed Municipal Fund, Inc.
- --------------------------------------------------------------------------------

Statement of Net Assets (continued)
April 30, 1999
(Unaudited)

<TABLE>
<CAPTION>
                                                                  Rating*
                                                                 (Moody's/      Par       Market
Issuer                                                             S&P)        (000)       Value
- ---------------------------------------------------------------------------------------------------
<S>                                                              <C>         <C>       <C>

General Obligations -- concluded
Other Revenue -- 2.4%
Texas Water Development Board Revenue
   4.75%, 7/15/20 ............................................   Aa1/AAA     $3,000     $ 2,834,940
                                                                                       ------------
Prerefunded Issues -- 12.5%
Arlington, TX, School District
   5.75%, 2/15/21 ............................................   Aaa/NR**     3,535       3,849,862
Charlotte, NC
   5.80%, 2/1/16 .............................................   Aaa/AAA      2,500       2,746,850
Chicago, IL, Metropolitan Water
   Reclamation District-Greater Chicago
   6.30%, 12/1/09 ............................................   Aa2/AA       1,000       1,127,040
Indianapolis, IN, Public Improvement
   Board Revenue
   6.00%, 1/10/18 ............................................   Aaa/AAA      1,500       1,612,845
Lower Colorado River Authority,
   Jr. Lien
   5.25%, 1/1/15 .............................................   #AAA/AAA     2,000       2,098,200
State of Hawaii Prerefunded
   7.00%, 6/1/06 .............................................   #AAA/++        750         778,815
Texas State
   6.00%, 10/1/14 ............................................   Aa2/AA       2,000       2,202,260
                                                                                       ------------
                                                                                         14,415,872
                                                                                       ------------
Transportation Revenue -- 9.5%
Florida Transportation
   5.80%, 7/1/18 .............................................   Aa2/AA+      2,000       2,207,180
Kansas Transportation
   5.40%, 3/1/09 .............................................   Aa2/AA+      2,000       2,103,720
   5.40%, 3/1/09 .............................................   Aa2/AA+      2,500       2,673,250
Virginia State Transportation Board
   5.125%, 5/15/21 ...........................................   Aa2/AA       4,000       3,966,000
                                                                                       ------------
                                                                                         10,950,150
                                                                                       ------------
Total Municipal Bonds
  (Cost $105,307,888) ........................................                          110,818,687
                                                                                       ------------
</TABLE>


8


<PAGE>

- --------------------------------------------------------------------------------
Managed Municipal Fund, Inc.
- --------------------------------------------------------------------------------

Statement of Net Assets (concluded)
April 30, 1999
(Unaudited)


                                                                   Market
Issuer                                                             Value
- --------------------------------------------------------------------------------
REPURCHASE AGREEMENT: 0.4%
Goldman Sachs & Co., 4.80%
   Dated 4/30/99, to be repurchased for $421,168 on
   5/3/99, collateralized by U.S. Treasury Bonds with
   a market value of $429,807
   (Cost $421,000)                                               $    421,000
                                                                 ------------
Total Investments--96.2%
  (Cost $105,728,888)***                                          111,239,687
Other Assets in Excess of Liabilities--3.8%                         4,451,538
                                                                 ------------
Total Net Assets--100.0%                                         $115,691,225
                                                                 ------------
Net Asset Value and Redemption Price Per:
  Flag Investors Class A Share
    ($36,728,661 / 3,377,193 shares outstanding)                 $      10.88
                                                                 ============

  ISI Class Share
    ($78,962,564 / 7,259,041 shares outstanding)                 $      10.88
                                                                 ============
Maximum Offering Price Per:
  Flag Investors Class A Share
    ($10.88 / 0.9550)                                            $      11.39
                                                                 ============
  ISI Class Share
    ($10.88 / 0.9555)                                            $      11.39
                                                                 ============
- --------
     *  The Moody's and Standard & Poor's ratings indicated are believed to be
        the most recent ratings available as of April 30, 1999.
    **  Not rated.
   ***  Also Aggregate cost for federal tax purposes.
    ++  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.

                                                                               9

<PAGE>

- --------------------------------------------------------------------------------
Managed Municipal Fund, Inc.
- --------------------------------------------------------------------------------

Statement of Operations
For the Six Months Ended April 30, 1999
(Unaudited)

- --------------------------------------------------------------------------------
INVESTMENT INCOME:
   Interest .....................................................   $ 2,944,580
                                                                    -----------

EXPENSES:
   Investment advisory fee ......................................       234,105
   Distribution fee .............................................       146,316
   Administration fee ...........................................       117,053
   Professional Fees ............................................        71,564
   Accounting fee ...............................................        28,616
   Registration fees ............................................        23,533
   Transfer agent fee ...........................................        21,711
   Printing and postage .........................................        20,995
   Custodian fee ................................................        10,594
   Miscellaneous ................................................        13,172
                                                                    -----------
      Total expenses ............................................       687,659

   Less: Fees waived ............................................      (160,923)
                                                                    -----------
      Net expenses ..............................................       526,736
                                                                    -----------
   Net investment income ........................................     2,417,844
                                                                    -----------

NET REALIZED AND UNREALIZED GAIN/(LOSS) ON INVESTMENTS:
   Net realized gain from security transactions .................       227,001
   Change in unrealized appreciation/depreciation  of investments    (1,114,438)
                                                                    -----------
   Net loss on investments ......................................      (887,437)
                                                                    -----------

NET INCREASE IN NET ASSETS RESULTING
 FROM OPERATIONS ................................................   $ 1,530,407
                                                                    ===========
- --------------------------------------------------------------------------------
See Notes to Financial Statements.

10

<PAGE>

- --------------------------------------------------------------------------------
Managed Municipal Fund, Inc.
- --------------------------------------------------------------------------------

Statements of Changes in Net Assets

<TABLE>
<CAPTION>
                                                                    For the Six
                                                                   Months Ended        For the Year
                                                                  April 30, 1999           Ended
                                                                    (Unaudited)      October 31, 1998
- -----------------------------------------------------------------------------------------------------
<S>                                                                <C>              <C>
INCREASE/(DECREASE) IN NET ASSETS:
Operations:
     Net investment income ......................................   $   2,417,844    $   4,931,438
     Net realized gain from
        security transactions ...................................         227,001          910,737
     Change in unrealized appreciation/
        depreciation of investments .............................      (1,114,438)       2,598,160
                                                                    -------------    -------------
     Net increase in net assets
        resulting from operations ...............................       1,530,407        8,440,335
                                                                    -------------    -------------
DIVIDENDS TO SHAREHOLDERS FROM:
     Net investment income and net realized short-term gains:
        ISI Class Shares ........................................        (932,725)      (3,912,967)
        Flag Investors Class A Shares ...........................      (1,977,900)      (1,861,540)
     Net realized mid-term and long-term gains:
        ISI Class Shares ........................................            --           (218,689)
        Flag Investors Class A Shares ...........................            --           (106,065)
                                                                    -------------    -------------
     Total distributions ........................................      (2,910,625)      (6,099,261)
                                                                    -------------    -------------
CAPITAL SHARE TRANSACTIONS:
     Proceeds from sale of shares ...............................       4,322,066        7,880,427
     Value of shares issued in reinvestment of dividends ........       1,447,758        3,000,727
     Cost of shares repurchased .................................      (6,659,002)     (12,655,343)
                                                                    -------------    -------------
     Increase/(decrease) in net assets derived from
        capital share transactions ..............................        (889,178)      (1,774,189)
                                                                    -------------    -------------
     Total increase/(decrease) in net assets ....................      (2,269,396)         566,885
NET ASSETS:
     Beginning of period ........................................     117,960,621      117,393,736
                                                                    -------------    -------------
     End of period including undistributed net investment
        income/(loss) of ($233,663) and $32,118,
        respectively ............................................   $ 115,691,225    $ 117,960,621
                                                                    =============    =============

- --------------------------------------------------------------------------------------------------
</TABLE>
See Notes to Financial Statements.

                                                                              11

<PAGE>

- --------------------------------------------------------------------------------
Managed Municipal Fund, Inc.
- --------------------------------------------------------------------------------
Financial Highlights -- ISI Class
(For a share outstanding throughout each period)

<TABLE>
<CAPTION>

                                               For the Six
                                              Months Ended                          For the Year Ended October 31,
                                              April 30,1999    ---------------------------------------------------------------------
                                              (Unaudited)         1998           1997           1996           1995           1994
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>            <C>            <C>            <C>            <C>           <C>
Per Share Operating Performance:
   Net asset value at beginning of period       $ 11.01        $ 10.79        $ 10.58        $ 10.65        $  9.81        $ 11.10
                                                -------        -------        -------        -------        -------        -------
Income from Investment Operations:
   Net investment income ................          0.22           0.46           0.52           0.48           0.48           0.46
   Net realized and unrealized
     gain/(loss) on investments .........         (0.08)          0.33           0.24           --             0.98          (1.15)
                                                -------        -------        -------        -------        -------        -------
   Total from Investment Operations .....          0.14           0.79           0.76           0.48           1.46          (0.69)
                                                -------        -------        -------        -------        -------        -------
Less Distributions:
   Net investment income and net realized
     short-term gains ...................         (0.27)         (0.54)         (0.52)         (0.54)         (0.54)         (0.56)
   Net realized mid-term and
     long-term gains ....................          --            (0.03)         (0.03)         (0.01)         (0.08)         (0.04)
                                                -------        -------        -------        -------        -------        -------
   Total distributions ..................         (0.27)         (0.57)         (0.55)         (0.55)         (0.62)         (0.60)
                                                -------        -------        -------        -------        -------        -------
   Net asset value at end of period .....       $ 10.88        $ 11.01        $ 10.79        $ 10.58        $ 10.65        $  9.81
                                                =======        =======        =======        =======        =======        =======
Total Return(1)..........................          1.29%          7.51%          7.43%          4.67%         15.42%         (6.49)%
Ratios to Average Daily Net Assets:
   Expenses(2)...........................          0.90%(4)       0.90%          0.90%          0.90%          0.90%          0.90%
   Net investment income(3)..............          4.13%(4)       4.24%          4.46%          4.48%          4.72%          4.37%
Supplemental Data:
   Net assets at end of period (000):
      ISI Class Shares ..................       $78,962        $80,749        $79,003        $84,712        $86,292        $83,607
      Flag Investors Class A Shares .....       $36,729        $37,212        $38,390        $41,193        $45,980        $49,903
   Portfolio turnover rate ..............             4%            18%            26%            32%            55%            37%


- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
(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 1.17% (annualized),
     for the six months ended April 30, 1999, and 1.13%, 1.10%, 1.13%, 1.10%,
     and 1.11% for the years ended Oct. 31, 1998, 1997, 1996, 1995 and 1994,
     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 3.85%
     (annualized), for the six months ended April 30, 1999, and 4.01%, 4.26%,
     4.25%, 4.52% and 4.16% for the years ended Oct. 31, 1998, 1997, 1996, 1995
     and 1994, respectively.
(4)  Annualized.

See Notes to Financial Statements.

12

<PAGE>

- --------------------------------------------------------------------------------
Notes to Financial Statements
- --------------------------------------------------------------------------------

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 February 26, 1990, and Flag Investors
     Managed Municipal Fund Class A Shares ("Flag Investors Class A Shares"),
     which began 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 generally accepted accounting principles.
     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 presentation. 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. 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.

     Security Transactions, Investment Income, Distributions and Other -- The
     Fund uses


                                                                              13

<PAGE>

- --------------------------------------------------------------------------------
Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------

     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 and Investment Company Capital Corp. ("ICC"), an indirect
     subsidiary of Bankers Trust Corporation, is the Fund's administrator. 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, 1999, ISI's advisory fee was $234,105 (net of fee waivers)
     of which $38,181 was payable at the end of the period. As compensation for
     its administrative services, the Fund pays ICC 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 0.20%. For the six month period ended April
     30, 1999 ICC's administration fee was $117,053 (net of fee waivers) of
     which $19,020 was payable at the end of the period.

     ISI and ICC have agreed to reduce their fees proportionately when necessary
     so that the Fund's annual expenses are no more than 0.90% of the Fund's
     average daily net assets. For the period ended April 30, 1999, ISI waived
     fees of $107,282 and ICC waived fees of $53,641.

     Certain officers and directors of the Fund are also officers or directors
     of the Fund's investment advisor or administrator.

     ICC also provides accounting services to the Fund for which the Fund pays
     ICC an annual fee that is calculated daily based upon its average daily net
     assets and paid monthly. For the six months ended April 30, 1999 ICC's fee
     was $23,896 of which $4,720 was payable at the end of the period. ICC also
     provides transfer agency services to the Fund for which the Fund pays ICC a
     per account fee that is calculated and paid monthly. For the six months
     ended April 30, 1999 ICC's fee was $16,238 of which $11,473 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 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 months
     ended April 30, 1999, distribution fees aggregated $146,316. ISI Group's
     fee was $99,421 of which $16,275 was payable at the end of the period. ICC
     Distributor's fee was $46,895 of which $7,588 was payable at the end of the
     period.

     The Fund's complex offers a retirement plan for eligible Directors. The
     actuarially computed pension expense allocated to the Fund for the period
     ended April 30, 1999 was $818 and the accrued liability was $23,669.

C.   Capital Share Transactions -- The Fund is authorized to issue up to 37
     million shares of $.001 par value capital stock (20 million ISI Class, 15
     million Flag Investors Class A, and

14

<PAGE>

- --------------------------------------------------------------------------------
Notes to Financial Statements (concluded)
- --------------------------------------------------------------------------------

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, 1999(1)      Oct. 31, 1998
                                           ------------------     --------------

Shares sold ..........................             140,630              518,215
Shares issued to share-
  holders on reinvest-
  ment of dividends ..................              85,549              190,021
Shares redeemed ......................            (303,189)            (695,012)
                                               -----------          -----------
Net increase/(decrease)
  in shares
  outstanding ........................             (77,010)              13,224
                                               ===========          ===========
Proceeds from sale
  of shares ..........................         $ 1,539,366          $ 5,635,106
Value of reinvested
  dividends ..........................             934,627            2,057,230
Cost of shares
  redeemed ...........................          (3,317,921)          (7,540,268)
                                               -----------          -----------
Net increase/(decrease)
  from capital share
  transactions .......................         $  (843,928)         $   152,068
                                               ===========          ===========

                                               Flag Investors Class A Shares
                                           -------------------------------------
                                              For the Six            For the
                                              Months Ended          Year Ended
                                            April 30, 1999(1)      Oct. 31, 1998
                                           ------------------     --------------

Shares sold ..........................             254,000              206,924
Shares issued to share-
  holders on reinvest-
  ment of dividends ..................              46,969               87,142
Shares redeemed ......................            (305,065)            (470,241)
                                               -----------          -----------
Net decrease in shares
  outstanding ........................              (4,096)            (176,175)
                                               ===========          ===========
Proceeds from sale
  of shares ..........................         $ 2,782,700          $ 2,245,321
Value of reinvested
  dividends ..........................             513,130              943,497
Cost of shares
  redeemed ...........................          (3,341,081)          (5,115,075)
                                               -----------          -----------
Net decrease from
  capital share
  transactions .......................         $   (45,251)         $(1,926,257)
                                               ===========          ===========
- ---------------
(1)  Unaudited


D.   Investment Transactions -- Excluding short-term obligations, purchases of
     investment securities aggregated $4,851,050 and sales of investment
     securities aggregated $8,034,030 for the period ended April 30, 1999.

     On April 30, 1999, aggregate net unrealized appreciation over tax cost for
     portfolio securities was $5,510,798 of which $5,700,412 related to
     appreciated securities and $189,614 related to depreciated securities.

E. Net Assets -- At April 30, 1999, net assets consisted of:

          Paid-in capital:
            ISI Class Shares .....................      $  76,257,829
            Flag Investors
                Class A Shares ...................         34,156,260
          Undistributed net
            investment loss ......................           (460,663)
          Accumulated net realized gain
            from security transactions ...........            227,001
          Unrealized appreciation
            of investments .......................          5,510,798
                                                        -------------
                                                        $ 115,691,225
                                                        =============

F.   Subsequent Event -- Effective June 1, 1999 ICC's fees for providing
     administrative services to the Fund were changed to the following schedule:

     Combined Assets of ISI Funds    Incremental Fee
        ----------------------        -------------
            $0-$75,000,000                .20%
       $75,000,000-$150,000,000           .15%
       $150,000,000-$225,000,000          .10%
       $225,000,000-$500,000,000          .05%
           over $500,000,000              .03%

     Concurrent with this fee change ICC terminated its participation in fee
     waivers.


                                                                              15

<PAGE>


                                       ISI
                                     Managed
                                    Municipal
                                   Fund Shares

Directors and Officers

Edward S. Hyman                               Carl W. Vogt, Esq.
Chairman                                      Director

Richard T. Hale                               Nancy Lazar
Vice Chairman                                 Vice President

R. Alan Medaugh                               Carrie L. Butler
Director and President                        Vice President

James J. Cunnane                              Margaret M. Beeler
Director                                      Assistant Vice President

Joseph R. Hardiman                            Keith C. Reilly
Director                                      Assistant Vice President

Louis E. Levy                                 Joseph A. Finelli
Director                                      Treasurer

Eugene J. McDonald                            Amy M. Olmert
Director                                      Secretary

Rebecca W. Rimel                              Scott J. Liotta
Director                                      Assistant Secretary



Investment Objective

A mutual fund 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.

- --------------------------------------------------------------------------------
Investment Advisor
- --------------------------------------------------------------------------------
ISI Inc.
717 Fifth Avenue
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.
717 Fifth Avenue
New York, NY 10022
(800) 955-7175


ISI
                       International Strategy & Investment


                                       ISI
                                MANAGED MUNICIPAL
                                   FUND SHARES

                    (A Class of Managed Municipal Fund, Inc.)


                                   MUNICIPALS
                                    GRAPHIC
                                   ----------


                               SEMI-ANNUAL REPORT

                                 April 30, 1999


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