MANAGED MUNICIPAL FUND INC
N-30D, 2000-06-29
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                         [Flag Investors logo omitted]

                                MANAGED MUNICIPAL
                                   FUND SHARES

                               Semi-Annual Report
                                 April 30, 2000

<PAGE>

<PAGE>

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

                             [map graphic omitted]

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

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

                                                                               1
<PAGE>

LETTER TO SHAREHOLDERS
--------------------------------------------------------------------------------

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 October 23, 1990,  the Fund has
produced a cumulative  total return of 75.98%,  which translates into an average
annual total return of 6.12%. 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.

     [line graph omitted]
     plot points as follows:
     10/29/99     32
                  33
     11/12/99     41
                  44
                  37
     12/3/99      39
                  38
                  35
     12/24/99     39
                  39
                  40
     1/14/00      40
                  39
                  38
     2/4/00       41
                  44
                  49
     2/25/00      51
                  51
                  53
     3/17/00      56
                  57
                  64
     4/7/00       65
                  52
                  50
     4/28/00      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


2
<PAGE>

--------------------------------------------------------------------------------

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

R. Alan Medaugh
President

May 5, 2000

                                                                               3
<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 chart below.  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.

[bar chart 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

4
<PAGE>

--------------------------------------------------------------------------------

     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.

     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.

                                                                               5
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

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.

     The SEC standardized total return figures include the impact of the maximum
4.5% initial  sales charge for the Class A Shares.  Returns  would be higher for
Class A Shares investors who qualified for a lower initial sales charge.

Average Annual Total Return(1)

  Periods Ended   4/30/00         1 Year         5 Years      Since Inception(*)
--------------------------------------------------------------------------------
  Class A Shares                  (6.57)%         4.12%             5.60%
--------------------------------------------------------------------------------
(1) PAST  PERFORMANCE IS NOT AN INDICATOR OF FUTURE  RESULTS.  Since  investment
    return and principal value will fluctuate, an investor's shares may be worth
    more or less than their original cost when redeemed.

(*) 10/23/90

     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.

     These  figures  assume  the  reinvestment  of  dividend  and  capital  gain
distributions.  Returns  would have been lower  during the  specified  period if
certain fees and expenses had not been waived.

6
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                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------
STATEMENT OF NET ASSETS                                          APRIL 30, 2000
(UNAUDITED)
                                            Rating*         Par        Market
Issuer                                   (Moody's/S&P)     (000)        Value
--------------------------------------------------------------------------------
 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
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

8
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------
                                            Rating*          Par        Market
Issuer                                   (Moody's/S&P)      (000)        Value
--------------------------------------------------------------------------------
 MUNICIPAL BONDS -- (Continued)
--------------------------------------------------------------------------------
GENERAL OBLIGATIONS -- (CONTINUED)
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
                                                                    -----------
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
                                                                    -----------
                                                                               9
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------
STATEMENT OF NET ASSETS (CONCLUDED)                              APRIL 30, 2000
(UNAUDITED)
                                            Rating*         Par        Market
Issuer                                   (Moody's/S&P)     (000)        Value
--------------------------------------------------------------------------------
 MUNICIPAL BONDS -- (Concluded)
--------------------------------------------------------------------------------
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
                                                                    -----------
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
                                                                    -----------

10
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FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------
                                                          Par         Market
Issuer                                                   (000)         Value
--------------------------------------------------------------------------------
 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:
   Flag Investors Class A Share
   ($32,197,831 / 3,168,116 shares outstanding) ..................       $10.16
                                                                         ======
   ISI Class Share
   ($65,117,356 / 6,406,082 shares outstanding) ..................       $10.16
                                                                         ======
MAXIMUM OFFERING PRICE PER:
   Flag Investors Class A Share
   ($10.16 / 0.9550) .............................................       $10.64
                                                                         ======
   ISI Class Share
   ($10.16 / 0.9555) .............................................       $10.63
                                                                         ======

--------------
    *  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.

                                                                              11
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FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------
STATEMENT OF OPERATIONS
                                                                     For the Six
                                                                    Months Ended
                                                                      April 30,
--------------------------------------------------------------------------------
                                                                        2000(1)
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
                                                                     ==========

----------------
(1) Unaudited.

                       SEE NOTES TO FINANCIAL STATEMENTS.

12
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------
STATEMENTS OF CHANGES IN NET ASSETS
                                                     For the Six       For the
                                                    Months Ended     Year Ended
                                                      April 30,      October 31,
--------------------------------------------------------------------------------
                                                       2000(1)         1999
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:
      Flag Investors Class A Shares .............      (774,647)     (1,600,162)
      ISI Class Shares ..........................    (1,616,417)     (3,369,957)
   Net realized long-term gains:
      Flag Investors Class A Shares .............            --        (151,301)
      ISI Class Shares ..........................            --        (312,768)
                                                   ------------     -----------
   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 ended
      October 31, 1999 ..........................  $ 97,315,187    $104,758,400
                                                   ============    ============

--------------------
(1) Unaudited.

                       SEE NOTES TO FINANCIAL STATEMENTS.

                                                                              13
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS -- FLAG INVESTORS CLASS A
(FOR A SHARE OUTSTANDING THROUGHOUT EACH YEAR)
                                                                 For the Six
                                                                Months Ended
                                                                  April 30,
--------------------------------------------------------------------------------
                                                                   2000(4)
Per Share Operating Performance:
   Net asset value at beginning of period .......................  $ 10.12
                                                                   -------
Income from Investment Operations:
   Net investment income ........................................     0.23
   Net realized and unrealized gain/(loss) on investments .......     0.05
                                                                   -------
   Total from Investment Operations .............................     0.28
                                                                   -------
Less Distributions:
   Distributions from net investment income
      and net realized short-term gains .........................    (0.24)
   Distributions from net realized long-term gains ..............       --
                                                                   -------
   Total distributions ..........................................    (0.24)
                                                                   -------
   Net asset value at end of period .............................  $ 10.16
                                                                   =======
Total Return(3) .................................................     2.81%
Ratios to Average Daily Net Assets:
   Expenses(1) ..................................................     0.90%(5)
   Net investment income(2) .....................................     4.48%(5)
Supplemental Data:
   Net assets at end of period (000):
      Flag Investors Class A Shares .............................  $32,198
      ISI Class Shares ..........................................  $65,117
   Portfolio turnover rate ......................................        9%

---------------
(1) Without the waiver of advisory and administration fees (Note 2), 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.
(2) Without the waiver of advisory and administration fees (Note 2), the ratio
    of net investment income to average daily net assets would have been 4.38%
    (annualized), 4.03%, 4.01%, 4.26%, 4.25% and 4.52% for the six months ended
    April 30, 2000, and for the years ended October 31, 1999, 1998, 1997, 1996
    and 1995, respectively.
(3) Total return excludes the effect of sales charge.
(4) Unaudited.
(5) Annualized.

14
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                               For the Years Ended October 31,
-------------------------------------------------------------------------------------------------------------------------------
                                                                 1999           1998          1997        1996           1995
--------------------------------------------------------------------------------------------------------------------------------
<S>                                                            <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
                                                               -------        -------       -------      -------        -------
Income from Investment Operations:
   Net investment income ....................................     0.45           0.46          0.52         0.48           0.48
   Net realized and unrealized gain/(loss) on investments ...    (0.83)          0.33          0.24           --           0.98
                                                               -------        -------       -------      -------        -------
   Total from Investment Operations .........................    (0.38)          0.79          0.76         0.48           1.46
                                                               -------        -------       -------      -------        -------
Less Distributions:
   Distributions from net investment income
      and net realized short-term gains .....................    (0.47)         (0.54)        (0.52)       (0.54)         (0.54)
   Distributions from net realized long-term gains ..........    (0.04)         (0.03)        (0.03)       (0.01)         (0.08)
                                                               -------        -------       -------      -------        -------
   Total distributions ......................................    (0.51)         (0.57)        (0.55)       (0.55)         (0.62)
                                                               -------        -------       -------      -------        -------
   Net asset value at end of period .........................  $ 10.12        $ 11.01       $ 10.79      $ 10.58        $ 10.65
                                                               =======        =======       =======      =======        =======
Total Return(3) .............................................    (3.61)%         7.51%         7.43%        4.67%         15.42%
Ratios to Average Daily Net Assets:
   Expenses(1)                                                    0.90%          0.90%         0.90%        0.90%          0.90%
   Net investment income(2)                                       4.23%          4.24%         4.46%        4.48%          4.72%
Supplemental Data:
   Net assets at end of period (000):
      Flag Investors Class A Shares                            $34,150        $37,212       $38,390      $41,193        $45,980
      ISI Class Shares                                         $70,609        $80,749       $79,003      $84,712        $86,292
   Portfolio turnover rate                                           8%            18%           26%          32%            55%

---------------
<FN>
(1) Without the waiver of advisory and administration fees (Note 2), 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.
(2) Without the waiver of advisory and administration fees (Note 2), the ratio
    of net investment income to average daily net assets would have been 4.38%
    (annualized), 4.03%, 4.01%, 4.26%, 4.25% and 4.52% for the six months ended
    April 30, 2000, and for the years ended October 31, 1999, 1998, 1997, 1996
    and 1995, respectively.
(3) Total return excludes the effect of sales charge.
(4) Unaudited.
(5) Annualized.
</FN>
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS.

                                                                              15
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

NOTE 1 -- 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  investment  management 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  exempt  from  federal  income  tax  through
investment   in  a  portfolio   consisting   primarily  of  tax-free   municipal
obligations.

     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 in accordance with accounting  principles  generally accepted in
the United States.  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:

   A.  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 such prices are  determined by the
       Investment  Advisor to reflect  the fair market  value of such  municipal
       obligations. When there is an available market quotation, the Fund values
       a municipal obligation by using the most recent quoted bid 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.

16
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

NOTE 1 -- concluded

   B.  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 requires
       that the  collateral's  market  value,  including  any accrued  interest,
       exceed the  broker's  repurchase  obligation.  The  Fund's  access to the
       collateral may be delayed or limited if the broker defaults, the value of
       the  collateral   declines  or  the  broker  enters  into  an  insolvency
       proceeding.

   C.  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.

   D.  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,  gains 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.

NOTE 2 -- 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 months ended April 30,
2000,  ISI's advisory fee was $200,054,  of which $32,443 was payable at the end
of the period.

                                                                              17
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

NOTE 2 -- concluded

     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 months 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 combined assets of the ISI Funds  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 also provides  accounting services to the Fund for which the Fund pays
ICCC an annual fee that is  calculated  daily based upon its  average  daily net
assets and paid monthly. For the six months 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 agency services to the Fund for which the Fund
pays ICCC a per account fee that is  calculated  and paid  monthly.  For the six
months 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. 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,  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.

18
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

NOTE 3 -- Capital Share Transactions

     The Fund is authorized to issue up to 55 million  shares of $.001 par value
capital  stock (15 million  Flag  Investors  Class A, 20 million ISI Class,  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 below.

                                               FLAG INVESTORS CLASS A SHARES
                                          --------------------------------------
                                              FOR THE SIX           FOR THE
                                             MONTHS ENDED         YEAR ENDED
                                            APRIL 30, 2000(1)  OCTOBER 31, 1999
                                           ------------------  ----------------
 Shares sold ...............................      222,913           490,026
 Shares issued to shareholders on
    reinvestment of dividends ..............       46,086            92,630
 Shares redeemed ...........................     (474,777)         (590,052)
                                              -----------       -----------
 Net decrease in shares outstanding ........     (205,778)           (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.

                                                    ISI CLASS SHARES
                                         --------------------------------------
                                             FOR THE SIX           FOR THE
                                            MONTHS ENDED         YEAR ENDED
                                           APRIL 30, 20001    OCTOBER 31, 1998
                                          ----------------    ----------------
Shares sold ................................       70,594           261,822
Shares issued to shareholders on
   reinvestment 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)
                                              ===========      ============

----------------
1 Unaudited.

                                                                              19
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (CONCLUDED)

NOTE 4 -- 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 six month 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.

NOTE 5 -- Net Assets

     On April 30, 2000, net assets consisted of:

Paid-in capital:

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

20
<PAGE>

FLAG INVESTORS MANAGED MUNICIPAL FUND SHARES
--------------------------------------------------------------------------------

DIRECTORS AND OFFICERS

                                 EDWARD S. HYMAN
                                    CHAIRMAN

            R. ALAN MEDAUGH                   MARGARET M. BEELER
               PRESIDENT                   ASSISTANT VICE PRESIDENT

          JOSEPH R. HARDIMAN                  SUZANNE H. UGHETTA
               DIRECTOR                    ASSISTANT VICE PRESIDENT

             LOUIS E. LEVY                      KEITH C. REILLY
               DIRECTOR                    ASSISTANT VICE PRESIDENT

          CARL W. VOGT, ESQ.                   CHARLES A. RIZZO
               DIRECTOR                            TREASURER

              NANCY LAZAR                       FELICIA A. EMRY
            VICE PRESIDENT                         SECRETARY

          EDWARD J. VEILLEUX                     AMY M. OLMERT
            VICE PRESIDENT                    ASSISTANT SECRETARY

           CARRIE L. BUTLER                    DANIEL O. HIRSCH
            VICE PRESIDENT                    ASSISTANT SECRETARY

INVESTMENT OBJECTIVE
A mutual  fund  designed to provide a high level of total  return with  relative
stability of principal and, secondarily, high current income exempt from federal
income tax through  investment in a portfolio  consisting  primarily of tax-free
municipal obligations.

          ------------------------------------------------------------
               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 Flag
          Investors Funds,  including  charges and expenses,  obtain a
          prospectus from your investment  representative  or directly
          from the Fund at  1-800-767-FLAG.  Read it carefully  before
          you invest.
          ------------------------------------------------------------

<PAGE>

                     [Flag Investors logo omitted]

                            DOMESTIC EQUITY
                          Communications Fund
                         Emerging Growth Fund
                         Equity Partners Fund
                      Real Estate Securities Fund
                              Top 50 U.S.
                          Value Builder Fund

                         INTERNATIONAL EQUITY
                         European Mid-Cap Fund
                       International Equity Fund
                         Japanese Equity Fund
                              Top 50 Asia
                             Top 50 Europe
                             Top 50 World

                             FIXED INCOME
                     Managed Municipal Fund Shares
                    Short-Intermediate Income Fund
                Total Return U.S. Treasury Fund Shares

                             MONEY MARKET
                       Cash Reserve Prime Shares


                             P.O. Box 515
                       Baltimore, Maryland 21203
                             800-767-FLAG
                         WWW.FLAGINVESTORS.COM

                            Distributed by:
                        ICC DISTRIBUTORS, INC.

                                                                      MMSA(6/00)


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