--------------------------------------------------------------------------------
              THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISOR
--------------------------------------------------------------------------------


                                                                    May 31, 2001

Dear Shareholder:

      The  semi-annual  period was marked by the  Federal  Reserve's  aggressive
response to the dramatic U.S. led global economic  slowdown.  Economic  weakness
intensified as Gross Domestic Product ("GDP") growth slowed to a pace of 2% from
3% over the six-month  period.  The U.S. slowdown was primarily driven by a near
collapse in corporate  spending and expansion as profits declined,  as well as a
significant  reduction of  inventories.  In the first quarter of 2001,  the U.S.
Treasury  yield curve  steepening of 100 basis points between 2-year and 30-year
Treasuries dominated performance in the fixed income market as the Fed eased the
discount  rate 150 basis points over the quarter and then an additional 50 basis
points in April 2001 to 4.50%.

      Despite the  aggressive  Fed easing of interest rates due to concerns that
economic  activity  may  continue to be  "unacceptably  weak," all high  quality
spread sectors outperformed Treasuries over the period.

      Since March 2000, there has been an equity market decline of approximately
20%. With no immediate stimulus, this decline will place significant reliance on
monetary policy.  Looking  forward,  we believe the revival of profit growth and
continued  robust spending rates by consumers in the face of a negative  savings
rate  may  require  a Fed  funds  rate of 3.5% to  4.0%.  A Fed  that  can  move
aggressively  as inflationary  expectations  move down should continue to foster
increased  risk  tolerances  in the market.  While the direct  beneficiaries  of
declining  inflation  and Treasury  surpluses  should be short and  intermediate
Treasuries,  the longer-term  beneficiary should be the long-end of the Treasury
market,  particularly  15-year to 20-year Treasuries.  We believe investors will
more readily embrace high quality spread assets as substitutes for  intermediate
Treasuries  in the future.  We also believe that the GDP growth rate will remain
far below the 5.0% of 2000, as consumers spend less and save more.

      This semi-annual report contains a summary of market conditions during the
semi-annual  period and a review of portfolio  strategy by your Trust's managers
in addition to the Trust's unaudited financial statements and a detailed list of
the portfolio's holdings.  Continued thanks for your confidence in BlackRock. We
appreciate the opportunity to help you achieve your long-term investment goals.

Sincerely,

/s/ LAURENCE D. FINK                         /s/ RALPH L. SCHLOSSTEIN
--------------------                         ------------------------
Laurence D. Fink                             Ralph L. Schlosstein
Chairman                                     President

                                       1


                                                                    May 31, 2001

Dear Shareholder:
     We are  pleased  to  present  the  unaudited  semi-annual  report  for  The
BlackRock  Investment  Quality  Municipal  Trust Inc.  ("the Trust") for the six
months ended April 30, 2001.  We would like to take this  opportunity  to review
the  Trust's  stock  price  and net asset  value  (NAV)  performance,  summarize
developments in the fixed income markets and discuss recent portfolio management
activity.

     The Trust is a diversified,  actively  managed  closed-end  bond fund whose
shares  are traded on the New York Stock  Exchange  under the symbol  "BKN." The
Trust's  investment  objective is to provide high current  income that is exempt
from regular Federal income tax consistent with the preservation of capital. The
Trust seeks to achieve this  objective by investing in  investment  grade (rated
"AAA" to "BBB" by a major rating  agency or of  equivalent  quality)  tax-exempt
general   obligation  and  revenue  bonds  issued  by  city,  county  and  state
municipalities throughout the United States.

     The table below  summarizes  the changes in the Trust's stock price and nav
over the past six months:



                                 ---------------------------------------------------------------------
                                  4/30/01       10/31/00       CHANGE          HIGH            LOW
------------------------------------------------------------------------------------------------------
                                                                             
  STOCK PRICE                     $13.38         $12.125          10.35%      $13.875       $11.8125
------------------------------------------------------------------------------------------------------
  NET ASSET VALUE (NAV)           $14.58         $14.30            1.96%      $14.97        $14.24
------------------------------------------------------------------------------------------------------


THE FIXED INCOME MARKETS

     Investor hopes for a soft landing quickly turned to fears of a recession as
the U.S. economy rapidly  deteriorated  over the first part of the period.  This
economic weakness intensified in the beginning of 2001 as GDP growth slowed over
the six-month  period to 2% from 3%.  Increasing  pressure on corporate  profits
restrained  investment  spending,  subsequently  reducing the demand for capital
goods and output.  Despite eroding consumer confidence,  slower economic growth,
mounting  layoffs,  and the  reduction  of over $5  trillion  of wealth from the
decline of the equity  markets  from their early year 2000 highs,  the  consumer
remains  relatively  resilient.  According  to the minutes of the April 18, 2001
Federal Open Market  Committee  meeting,  "Capital  investment  has continued to
soften and the  persistent  erosion in current and  expected  profitability,  in
combination with rising uncertainty about the business outlook,  seems poised to
dampen capital spending going forward.  This potential restraint,  together with
the possible  effects of earlier  reductions in equity wealth on consumption and
the risk of  slower  growth  abroad,  threatens  to keep  the  pace of  economic
activity  unacceptably weak." Over the period, the Federal Reserve  aggressively
lowered the discount rate by a total of 2.00% to bring the current discount rate
to 4.50%. Additionally, at the May meeting, the Fed cut rates by 50 basis points
for the fifth time this year.

     U.S.  Treasury  yields began to regain their  characteristic  slopes in the
beginning of the period  after nearly a year of inversion  caused by $30 billion
of Treasury  buybacks  and  multiple  Federal  Reserve  tightenings.  The 2-year
Treasury  note rallied in response to a slumping  economy and a volatile  equity
market. The markets have been further supported by Fed actions,  which cut rates
by 50 basis points on four occasions over the period. The yield curve at the end
of the period  reflected  expectations  of another 100 basis points of easing by
September.  As of April 30, 2001, the 10-year Treasury was yielding 5.34% versus
5.75% on October 31, 2000.

     On a tax-adjusted basis,  municipal bonds outperformed the taxable domestic
bond market for the  semi-annual  period ending April 30, 2001,  returning 7.27%
(as measured by the LEHMAN MUNICIPAL INDEX at a tax bracket of 39.6%) versus the
LEHMAN AGGREGATE INDEX'S 6.22%. Throughout this period,  municipals performed in
line with spread  products and  Treasuries.  Municipals  benefited from retail's
continued   efforts  to  diversify   out  of  equities  and  into  fixed  income
investments.  In a dramatic  reversal from most of 2000, the semi-annual  period
finally saw municipal mutual fund portfolios experience positive cash flows. The
retail  market took a renewed  interest in  municipals  driven  primarily by the
turmoil  experienced  in  equities,  while  institutional  demand for  municipal
securities  increased as investors  looked for  attractive  after tax yields vs.
Treasuries  without the inherent credit risk associated with corporate bonds. As
a result of falling  interest  rates  during the second half of the period,  new
issue supply rose substantially above last year's pace.

                                       2


THE TRUST'S PORTFOLIO AND INVESTMENT STRATEGY

     The Trust's portfolio is actively managed to diversify  exposure to various
sectors,  issuers,  revenue sources and security types.  BlackRock's  investment
strategy  emphasizes  a  relative  value  approach,  which  allows  the Trust to
capitalize  upon  changing  market  conditions  by rotating  municipal  sectors,
credits and coupons.

     Additionally, the Trust employs leverage to enhance its income by borrowing
at short-term  municipal  rates and  investing  the proceeds in longer  maturity
issues that have higher  yields.  The degree to which the Trust can benefit from
its use of leverage  may affect its ability to pay high monthly  income.  At the
end of the period, the Trust's leverage amount was 37% of total assets.

     Municipals outperformed most spread products on a tax-adjusted basis during
the period, except on the short-end of the yield curve. The curve steepened over
the period and the 20-year to 25-year part of the curve  remains very steep on a
historical basis. We remain overweight in premium coupon securities in an effort
to avoid market discount problems.  Premium coupon securities offer better price
performance during periods of falling interest rates, and similar performance to
discounts  when interest  rates rise.  Retail demand  improved at the end of the
period, primarily for bonds 15-years or longer.

     The following charts compare the Trust's current and October 31, 2000 asset
composition and credit quality allocations:

          ----------------------------------------------------------------------
                                SECTOR BREAKDOWN
          ----------------------------------------------------------------------
          SECTOR                            APRIL 30, 2001     OCTOBER 31, 2000
          ----------------------------------------------------------------------
          Transportation                          18%                  20%
          ----------------------------------------------------------------------
          Industrial & Pollution Control          13%                  11%
          ----------------------------------------------------------------------
          University/School                       13%                  13%
          ----------------------------------------------------------------------
          Hospital                                12%                  12%
          ----------------------------------------------------------------------
          City, County & State                    11%                  11%
          ----------------------------------------------------------------------
          Housing                                  9%                   9%
          ----------------------------------------------------------------------
          Power                                    7%                   8%
          ----------------------------------------------------------------------
          Lease Revenue                            5%                   5%
          ----------------------------------------------------------------------
          Tax Revenue                              4%                   4%
          ----------------------------------------------------------------------
          Other                                    3%                   3%
          ----------------------------------------------------------------------
          Special District                         2%                   2%
          ----------------------------------------------------------------------
          Water & Sewer                            2%                   1%
          ----------------------------------------------------------------------
          Resource Recovery                        1%                   1%
          ----------------------------------------------------------------------

          ----------------------------------------------------------------------
          CREDIT RATING*                    APRIL 30, 2001     OCTOBER 31, 2000
          ----------------------------------------------------------------------
          AAA/Aaa                                 61%                  58%
          ----------------------------------------------------------------------
          AA/Aa                                   12%                  11%
          ----------------------------------------------------------------------
          A/A                                     16%                  19%
          ----------------------------------------------------------------------
          BBB/Baa                                 6%                    9%
          ----------------------------------------------------------------------
          BB/Ba                                   1%                   --
          ----------------------------------------------------------------------
          Not Rated                               4%                   3%
          ----------------------------------------------------------------------

----------------------
* Using the higher of Standard & Poor's, Moody's or Fitch's rating.

                                       3


     We look  forward to  continuing  to manage  the Trust to  benefit  from the
opportunities  available to investors in the investment grade municipal  market.
We  thank  you for your  investment  and  continued  interest  in The  BlackRock
Investment  Quality  Municipal Trust Inc. Please feel free to call our marketing
center at (800) 227-7BFM  (7236) if you have any specific  questions  which were
not addressed in this report.

Sincerely,


/s/ ROBERT S. KAPITO                     /s/ KEVIN M. KLINGERT
--------------------                     ---------------------
Robert S. Kapito                         Kevin M. Klingert
Vice Chairman and Portfolio Manager      Managing Director and Portfolio Manager


--------------------------------------------------------------------------------
              THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
--------------------------------------------------------------------------------
  Symbol on New York Stock Exchange:                                BKN
--------------------------------------------------------------------------------
  Initial Offering Date:                                     February 19, 1993
--------------------------------------------------------------------------------
  Closing Stock Price as of 4/30/01:                              $13.38
  Net Asset Value as of 4/30/01:                                  $14.58
  Yield on Closing Stock Price as of 4/30/01 ($13.38)(1):           5.83%
--------------------------------------------------------------------------------
  Current Monthly Distribution per Share(2):                      $ 0.065
--------------------------------------------------------------------------------
  Current Annualized Distribution per Share(2):                   $ 0.780
--------------------------------------------------------------------------------

----------------
(1) Yield  on  Closing  Stock  Price  is  calculated  by  dividing  the  current
    annualized distribution per share by the closing stock price per share.
(2) Distribution is not constant and is subject to change.


                         PRIVACY PRINCIPLES OF THE TRUST

     The Trust is committed to maintaining  the privacy of  shareholders  and to
safeguarding its non-public personal  information.  The following information is
provided to help you understand  what personal  information  the Trust collects,
how we  protect  that  information  and why,  in  certain  cases,  we may  share
information with select other parties.

     Generally,  the Trust does not receive any non-public personal  information
relating to its shareholders, although certain nonpublic personal information of
its  shareholders may become available to the Trust. The Trust does not disclose
any  non-public   personal   information   about  its   shareholders  or  former
shareholders  to anyone,  except as permitted by law or as is necessary in order
to service shareholder accounts (for example, to a transfer agent or third party
administrator).

     The Trust restricts  access to non-public  personal  information  about the
shareholders  to BlackRock  employees  with a legitimate  business  need for the
information. The Trust maintains physical,  electronic and procedural safeguards
designed to protect the non-public personal information of its shareholders.



                                       4


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
PORTFOLIO OF INVESTMENTS APRIL 30, 2001 (UNAUDITED)
--------------------------------------------------------------------------------



----------------------------------------------------------------------------------------------------------------------
        PRINCIPAL
          AMOUNT                                                                          OPTION CALL       VALUE
RATING*   (000)                             DESCRIPTION                                   PROVISIONS+     (NOTE 1)
----------------------------------------------------------------------------------------------------------------------
                                                                                            
                      LONG-TERM INVESTMENTS--157.4%
                      ALABAMA--6.0%
AAA     $14,000       University of Alabama Hosp. Rev., Ser. A, 5.875%, 9/01/31, MBIA .... 9/10 @ 101   $ 14,491,260
                                                                                                        ------------

                      ALASKA--5.0%
AAA      12,000       Alaska St. Hsg. Fin. Corp. Rev., Ser. A, 5.875%, 12/01/24, MBIA .... 12/05 @ 102    12,185,400
                                                                                                        ------------

                      CALIFORNIA--13.2%
Aa2       1,220       California Hsg. Fin. Agcy. Rev., Home Mtg., Ser. C, 5.65%, 8/01/14 . 2/04 @ 102      1,254,062
Aa2       5,770       California St. G.O., 5.625%, 5/01/18 ............................... 5/10 @ 101      5,875,418
AAA      15,460       Los Angeles Cnty. Asset Leasing Corp. Rev., 5.95%, 12/01/07, AMBAC  No Opt. Call    17,074,488
                      University of California Rev., Research Fac., Ser. B,
Aaa       2,000++      6.10%, 9/01/03 ....................................................     N/A         2,160,040
Aaa       3,305++      6.20%, 9/01/03 ....................................................     N/A         3,576,803
Aaa       2,000++      6.25%, 9/01/03 ....................................................     N/A         2,166,700
                                                                                                        ------------
                                                                                                          32,107,511
                                                                                                        ------------

                      COLORADO--11.4%
AAA       3,100       Arapahoe Cnty. Cap. Impvt. Hwy. Rev., Trust Fund, Ser. E,
                       Zero Coupon, 8/31/04 ..............................................    ETM          2,726,078
                      Denver City & Cnty. Arpt. Rev.,
A         3,000        Ser. C, 6.50%, 11/15/06 ........................................... 11/02 @ 102     3,152,610
A         1,120        Ser. C, 6.65%, 11/15/05 ........................................... 11/02 @ 102     1,181,163
Aaa       3,705++      Ser. D, 7.00%, 11/15/01 ...........................................     N/A         3,777,211
A        14,085        Ser. D, 7.00%, 11/15/25 ........................................... 11/01 @ 100    14,248,104
AAA       2,250++     E-470 Pub. Hwy. Auth. Rev., Ser. B, 6.90%, 8/31/05 .................     N/A         2,582,145
                                                                                                        ------------
                                                                                                          27,667,311
                                                                                                        ------------

                      CONNECTICUT--1.1%
Baa3      3,000       Mashantucket Western Pequot Tribe, Spl. Rev., Ser. A,
                       5.50%, 9/01/28** .................................................. 9/09 @ 101      2,765,490
                                                                                                        ------------

                      DELAWARE--3.0%
NR        7,000       Charter Mac Equity Issuer Trust, Ser. B, 7.60%, 11/30/10** .........No Opt. Call     7,343,630
                                                                                                        ------------

                     DISTRICT OF COLUMBIA--0.8%
                      District of Columbia G.O., Ser. E, CAPMAC, ........................
AAA          70++      6.00%, 6/01/03 ....................................................     N/A            74,734
AAA       1,830        6.00%, 6/01/09 .................................................... 6/03 @ 102      1,916,797
                                                                                                        ------------
                                                                                                           1,991,531
                                                                                                        ------------

                      FLORIDA--3.4%
AAA       1,680       Florida Hsg. Fin. Agcy. Rev., Sngl. Fam. Mtg., Ser. 1994-A, .......
                       6.55%, 7/01/14, GNMA .............................................. 1/05 @ 102      1,766,873
NR        5,000       Hillsborough Cnty. Ind. Dev. Auth. Fac. Rev., National Gypsum,
                       Ser. A, 7.125%, 4/01/30 ........................................... 4/10 @ 101      2,987,400
BB+       4,000       Santa Rosa Bay Bridge Auth. Rev., 6.25%, 7/01/28 ................... 7/06 @ 102      3,487,760
                                                                                                        ------------
                                                                                                           8,242,033
                                                                                                        ------------



                       See Notes to Financial Statements.

                                        5




----------------------------------------------------------------------------------------------------------------------
        PRINCIPAL
          AMOUNT                                                                          OPTION CALL       VALUE
RATING*   (000)                             DESCRIPTION                                   PROVISIONS+     (NOTE 1)
----------------------------------------------------------------------------------------------------------------------
                                                                                            
                      HAWAII--1.1%
AAA     $ 2,500       Hawaii St. Dept. Budget & Fin. Spl. Purp. Rev., Hawaiian Elec. Co.
                       Inc., Ser. D, 6.15%, 1/01/20, AMBAC ............................... 1/09 @ 101   $  2,662,400
                                                                                                        ------------

                      ILLINOIS--12.6%
AAA      10,000       Chicago Brd. of Edl., Chicago Sch. Reform, 5.75%, 12/01/27, AMBAC ..12/07 @ 102     10,294,000
AAA       5,000       Chicago Pub. Bldg. Rev., Ser. A, 7.00%, 1/01/20, MBIA ..............    ETM          6,006,150
AAA       5,050       Chicago Wtr. Rev., 5.25%, 11/01/23, FGIC ...........................11/07 @ 102      4,900,873
                      Illinois Edl. Fac. Auth. Rev., Loyola Univ., FGIC,
AAA       4,000++      5.45%, 7/01/05 ....................................................    N/A          4,177,520
AAA       5,000++      5.70%, 7/01/05 ....................................................    N/A          5,253,000
                                                                                                        ------------
                                                                                                          30,631,543
                                                                                                        ------------

                      INDIANA--3.3%
BBB       7,595       Indianapolis Arpt. Auth. Rev., Spl. Fac. Fed. Express Corp. Proj.,
                       7.10%, 1/15/17 .................................................... 7/04 @ 102      8,023,434
                                                                                                        ------------

                      KENTUCKY--8.4%
AAA      16,465       Kentucky Econ. Dev. Fin. Sys., Norton Hlth. Care Inc., Ser. B,
                       Zero Coupon, 10/01/23, MBIA .......................................No Opt. Call     4,511,410
AAA      15,000++     Kentucky St. Tpke. Auth., Econ. Dev. Road Rev., 5.75%, 7/01/03,
                       AMBAC .............................................................    N/A         15,974,100
                                                                                                        ------------
                                                                                                          20,485,510
                                                                                                        ------------

                      LOUISIANA--8.3%
AAA      14,400++     Louisiana Pub. Fac. Auth. Hosp. Rev., Our Lady of the Lake Regl.
                       Med. Ctr., 5.90%, 12/01/03, FSA ...................................    N/A         15,489,216
AAA       4,640       New Orleans Pub. Impt. G.O., 5.875%, 11/01/29, FSA .................11/09 @ 100      4,843,835
                                                                                                        ------------
                                                                                                          20,333,051
                                                                                                        ------------

                      MARYLAND--6.9%
Aa2       8,920       Maryland St. Dept. Hsg. & Cmnty. Dev. Admin., Sngl. Fam. Prog.,
                       Ser. 2, 6.55%, 4/01/26 ............................................4/05 @ 102       9,241,209
NR        4,000       MuniMae Te Bond Subsidiary LLC, Ser. B, , 7.75%, 11/01/10** ........No Opt. Call     4,208,360
AAA       3,175       Northeast Waste Disp. Auth. Rev., Sld. Wst., Montgomery Cnty.
                       Res. Rec. Proj., Ser. A, 6.30%, 7/01/16, MBIA ..................... 7/03 @ 102      3,322,701
                                                                                                        ------------
                                                                                                          16,772,270
                                                                                                        ------------

                      MASSACHUSETTS--1.2%
AAA       3,000       Massachusetts St. Hlth. & Edl. Fac. Auth. Rev., Hallmark Hlth.
                       Sys., Ser. A, 5.00%, 7/01/21, FSA .................................7/08 @ 101       2,814,630
                                                                                                        ------------

                      MICHIGAN--0.8%
AAA       2,000       River Rouge Sch. Dist., 5.625%, 5/01/22, FSA .......................5/03 @ 101.5     2,045,280
                                                                                                        ------------

                      MISSOURI--1.6%
                      LAKE OF THE OZARKS CMNTY. BRDG. CORP., BRDG. SYS. REV.,
BBB-      2,000        5.25%, 12/01/14 ...................................................12/08 @ 102      1,830,800
BBB-      2,500        5.25%, 12/01/26 ...................................................12/08 @ 102      2,162,225
                                                                                                        ------------
                                                                                                           3,993,025
                                                                                                        ------------

                      NEVADA--1.6%
AAA       3,750       Washoe Cnty. Arpt. Auth., Arpt. Sys. Impvt. Rev.,
                       Ser. B, 5.80%, 7/01/09, MBIA ...................................... 7/03 @ 102      3,927,488
                                                                                                        ------------


                       See Notes to Financial Statements.

                                        6




------------------------------------------------------------------------------------------------------------------------
        PRINCIPAL
          AMOUNT                                                                            OPTION CALL       VALUE
RATING*   (000)                             DESCRIPTION                                     PROVISIONS+     (NOTE 1)
------------------------------------------------------------------------------------------------------------------------
                                                                                              
                     NEW JERSEY--3.9%
AAA    $ 2,000       Delaware River Port Auth. PA & NJ Port Dist. Proj., Ser. B,
                       5.70%, 1/01/22, FSA ...............................................   1/10 @ 100   $  2,055,120
AA       7,000       New Jersey St. Transp. Trust Fund Auth. Rev., Transp. Sys., Ser. A,
                       6.00%, 6/15/19 ....................................................   6/10 @ 100      7,498,330
                                                                                                          ------------
                                                                                                             9,553,450
                                                                                                          ------------

                     NEW MEXICO--0.8%
AAA      1,945       Farmington P.C.R., So. CA. Edison Co., Ser. A, 5.875%, 6/01/23,
                       MBIA ..............................................................   6/03 @ 102      1,980,146
                                                                                                          ------------
                     NEW YORK--17.8%
                     New York City G.O.,
A+       4,140         Ser. A, 6.00%, 8/01/05 ............................................  No Opt. Call     4,464,866
A+       7,000         Ser. E, 6.50%, 2/15/06 ............................................  No Opt. Call     7,720,090
Aaa      7,000++       Ser. H, 7.20%, 2/01/02 ............................................      N/A          7,319,760
                     New York City Ind. Dev. Agcy. Spec. Fac. Rev., Term.
                       One Group Assoc. Proj.,
A-       4,000         6.00%, 1/01/08 ....................................................   1/04 @ 102      4,206,240
A-       1,000         6.00%, 1/01/15 ....................................................   1/04 @ 102      1,026,830
AA+     10,000       New York City Transitional Fin. Auth. Rev., Ser. B, 6.00%, 11/15/21 .   5/10 @ 101     10,831,800
                     New York St. Dorm. Auth. Rev., Univ. of Rochester, MBIA,
AAA      1,865         Ser. A, Zero Coupon, 7/01/21 ......................................   7/10 @ 101      1,135,468
AAA      2,030         Ser. A, Zero Coupon, 7/01/23 ......................................   7/10 @ 101      1,232,859
AAA      3,000++     New York St. Dorm. Auth. Rev., St. Univ. Edl. Fac., Ser. B, 6.10%,
                       5/15/04 ...........................................................      N/A          3,274,770
A        1,955       New York St. Hsg. Fin. Agcy., Hlth. Fac. of New York City, Ser. A,
                       6.375%, 11/01/04 ..................................................  No Opt. Call     2,091,205
                                                                                                          ------------
                                                                                                            43,303,888
                                                                                                          ------------

                     NORTH CAROLINA--2.3%
AAA      5,000       North Carolina Eastn. Mun. Pwr. Agcy. Sys. Rev., Ser. B,
                       7.00%, 1/01/08, CAPMAC ............................................  No Opt. Call     5,690,800
                                                                                                          ------------

                     OHIO--0.2%
NR         450       Cleveland Cuyahoga Cnty. Port Auth. Rev., Port Dev. Proj., 6.00%,
                       3/01/07 ...........................................................  No Opt. Call       449,267
                                                                                                          ------------

                     OREGON--2.2%
BBB-     5,600         KLAMATH FALLS ELEC. REV., SR. LIEN-KLAMATH COGEN, 5.50%, 1/01/07 ..  NO OPT. CALL     5,444,936
                                                                                                          ------------
                     PENNSYLVANIA--10.8%
AAA     10,100       Lehigh Cnty. Gen. Purpose Auth. Rev., St. Lukes Hosp. Bethlehem
                       Proj., 5.50%, 11/15/13, AMBAC .....................................  11/03 @ 102     10,330,886
AAA      7,000       Montgomery Cnty. Edl. & Hlth. Care Auth., Holy Redeemer,
                       5.25%, 10/01/23, AMBAC ............................................   0/07 @ 101      6,793,360
AAA      4,000       Pennsylvania Intergovernmental Coop. Auth. Spl. Tax Rev.,
                       Philadelphia Fdg. Prog.,
                       5.50%, 6/15/20, FGIC ..............................................   6/06 @ 100      4,031,960
                     Pennsylvania St. Higher Edl. Fac. Auth., Hlth. Svcs. Rev., Ser. A,
A        2,300         5.75%, 1/01/17 ....................................................   1/06 @ 101      2,279,967
A        2,750         5.875%, 1/01/15 ...................................................   1/06 @ 101      2,754,125
                                                                                                          ------------
                                                                                                            26,190,298
                                                                                                          ------------

                     RHODE ISLAND--2.2%
AA+      3,190       Rhode Island Hsg. & Mtg. Fin., Homeownership Oppty., Ser. 15-B,
                       6.75%, 10/01/17 ...................................................   4/04 @ 102      3,337,888
AAA      2,000       Rhode Island St. Hlth. & Edl. Bldg. Corp. Rev., Hosp. Fin., 5.50%,
                       5/15/16, MBIA .....................................................   5/07 @ 102      2,024,660

                                                                                                          ------------
                                                                                                             5,362,548
                                                                                                          ------------


                       See Notes to Financial Statements.

                                        7




-----------------------------------------------------------------------------------------------------------------------------------
        PRINCIPAL
          AMOUNT                                                                                    OPTION CALL        VALUE
RATING*   (000)                             DESCRIPTION                                             PROVISIONS+       (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
                     TENNESSEE--5.4%
A      $ 7,800       Maury Cnty. Ind. Dev. Brd., P.C.R., Saturn Corp. Proj., 6.50%, 9/01/24 ....     9/04 @ 102      $  8,110,206
AAA      4,865       Memphis Shelby Cnty. Arpt. Auth. Rev., Ser. D, 6.00%, 3/01/24, AMBAC ......     3/10 @ 101         5,090,201
                                                                                                                     ------------
                                                                                                                       13,200,407
                                                                                                                     ------------

                     TEXAS--6.6%
                     Dallas Cnty. Util. & Reclam. Dist., Ser. A, AMBAC,
AAA      6,085        Zero Coupon, 2/15/19 .....................................................   2/05 @ 44.538        2,097,074
AAA      3,800        Zero Coupon, 2/15/20 .....................................................   2/05 @ 41.799        1,235,684
BBB-     5,500       Dallas Ft. Worth Intl. Arpt. Fac. Impvt. Rev., Amer. Airlines Inc.,
                      6.375%, 5/01/35 ..........................................................    11/09 @ 101         5,370,365
AAA      6,000       Grapevine G.O., 5.875%, 8/15/24, FGIC .....................................     8/10 @ 100         6,220,080
Aa1      1,000       Texas St. Wtr. Fin. Asst. G.O., 5.75%, 8/01/22 ............................     8/10 @ 100         1,034,910
                                                                                                                     ------------
                                                                                                                       15,958,113
                                                                                                                     ------------

                     UTAH--2.5%
                     Intermountain Pwr. Agcy. Pwr. Supply Rev.,
AAA      2,810        5.00%, 7/01/13, AMBAC ....................................................         ETM            2,811,068
AAA      1,640        5.00%, 7/01/13, AMBAC ....................................................     7/01 @ 100         1,639,967
A+       1,145        Ser. 86-B, 5.00%, 7/01/16 ................................................         ETM            1,116,157
A+         655        Ser. 86-B, 5.00%, 7/01/16 ................................................     7/01 @ 100           638,501
                                                                                                                     ------------
                                                                                                                        6,205,693
                                                                                                                     ------------

                     WASHINGTON--8.8%
                     WASHINGTON ST. G.O.,
AA+      4,000        Ser. A, 5.375%, 7/01/21 ..................................................     7/06 @ 100         3,995,560
AA+      1,000        Ser. B, 6.00%, 1/01/25 ...................................................     1/10 @ 100         1,058,180
                     Washington St. Pub. Pwr. Supply Sys. Rev.,
AAA     13,395        Nuclear Proj. No. 1, 5.75%, 7/01/11, MBIA ................................     7/06 @ 102        14,296,082
AAA      2,000        Nuclear Proj. No. 2, 5.55%, 7/01/10, FGIC ................................     7/03 @ 102         2,046,580
                                                                                                                     ------------
                                                                                                                       21,396,402
                                                                                                                     ------------

                     WYOMING--4.2%
A       10,000       Sweetwater Cnty. P.C.R., Idaho Pwr. Co. Proj., Ser. A, 6.05%, 7/15/26 .....     7/06 @ 102        10,231,700
                                                                                                                     ------------

                     TOTAL LONG-TERM INVESTMENTS (COST $366,756,561) ...........................                      383,450,445
                                                                                                                     ------------

                     SHORT-TERM INVESTMENTS***--0.4%
                     CALIFORNIA--0.0%
A-1+        25       California Statewide Cmnty. Dev. Auth. Rev., John Muir/ Mt. Diablo Hlth.,
                      4.20%, 5/01/01, FRDD, AMBAC ..............................................         N/A               25,000
VMIG1       84       Irvine Impvt. BD. Act of 1915, Spec. Assmt. Dist. 97-17, 4.30%,
                      5/01/01, FRDD ............................................................         N/A               84,000
                                                                                                                     ------------
                                                                                                                          109,000
                                                                                                                     ------------

                     NEW YORK--0.4%
A-1+       900       New York City Mun. Wtr. Fin. Auth. Rev., Ser. G, 4.25%, 5/01/01, FRDD, FGIC         N/A              900,000
                                                                                                                     ------------


                       See Notes to Financial Statements.

                                        8




-----------------------------------------------------------------------------------------------------------------------------------
        PRINCIPAL
          AMOUNT                                                                                    OPTION CALL        VALUE
RATING*   (000)                             DESCRIPTION                                             PROVISIONS+       (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
                     TEXAS--0.0%
A-1+     $  75       Harris Cnty. Hlth. Fac. Dev. Corp. Rev., 4.35%, 5/01/01, FRDD ..............        N/A         $     75,000
                                                                                                                     ------------
                     TOTAL SHORT-TERM INVESTMENTS (COST $1,084,000) .............................                       1,084,000
                                                                                                                     ------------

                     TOTAL INVESTMENTS--157.8% (COST $367,840,561) ..............................                     384,534,445
                     Other assets in excess of liabilities--2.3% ................................                       5,672,436
                     Liquidation value of preferred stock--(60.1)% ..............................                    (146,550,000)
                                                                                                                     ------------
                     NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS--100% .........................                    $243,656,881
                                                                                                                     ============


-------------
  * Using the higher of Standard & Poor's, Moody's or Fitch's rating.
 ** Security is exempt from  registration  under rule 144a of the Securities Act
    of  1933.  These  securities  may be  resold  in  transactions  exempt  from
    registration to qualified institutional buyers.
*** For  purposes  of  amortized  cost  valuation,  the  maturity  date of these
    instruments  is  considered  to be the earlier of the next date on which the
    security  can be  redeemed  at par,  or the next  date on which  the rate of
    interest is adjusted.
  + Option call provisions: date (month/year) and price of the earliest optional
    call or redemption.  There may be other call provisions at varying prices at
    later dates.
 ++ This bond is prerefunded. See glossary for definition.


-----------------------------------------------------------------------
                              KEY TO ABBREVIATIONS:

         AMBAC -- American Municipal Bond Assurance Corporation
        CAPMAC -- Capital Markets Assurance Company
           ETM -- Escrowed to Maturity
          FGIC -- Financial Guaranty Insurance Company
          FRDD -- Floating Rate Daily Demand
           FSA -- Financial Security Assurance
          GNMA -- Government National Mortgage Association
          G.O. -- General Obligation
          MBIA -- Municipal Bond Insurance Association
        P.C.R. -- Pollution Control Revenue
-----------------------------------------------------------------------

                       See Notes to Financial Statements.

                                       9
 

--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
APRIL 30, 2001 (UNAUDITED)
--------------------------------------------------------------------------------

ASSETS
Investments, at value (cost $367,840,561) (Note 1)   $384,534,445
Cash .............................................        257,633
Interest receivable ..............................      6,935,279
Receivable for investments sold ..................         65,390
Other assets .....................................         34,970
                                                     ------------
                                                      391,827,717
                                                     ------------

LIABILITIES
Dividends payable--common stock ..................      1,085,961
Dividends payable--preferred stock ...............         88,354
Offering costs payable--preferred stock ..........        158,744
Investment advisory fee payable (Note 2) .........        113,317
Administration fee payable (Note 2) ..............         48,564
Deferred directors fees (Note 1) .................         19,947
Other accrued expenses ...........................        105,949
                                                     ------------
                                                        1,620,836
                                                     ------------
NET INVESTMENT ASSETS ............................   $390,206,881
                                                     ============
Net investment assets were comprised of:
  Common stock:
    Par value (Note 4) ...........................   $    167,071
    Paid-in capital in excess of par .............    231,608,000
  Preferred stock (Note 4) .......................    146,550,000
                                                     ------------
                                                      378,325,071
  Undistributed net investment income ............        708,563
  Accumulated net realized loss ..................     (5,520,637)
  Net unrealized appreciation ....................     16,693,884
                                                     ------------
Net investment assets, April 30, 2001 ............   $390,206,881
                                                     ============
Net assets applicable to common shareholders .....   $243,656,881
                                                     ============
Net asset value per share:
  ($243,656,881 / 16,707,093 shares of
  common  stock issued and outstanding) ..........         $14.58
                                                           ======

--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED APRIL 30, 2001 (UNAUDITED)
--------------------------------------------------------------------------------

NET INVESTMENT INCOME
Income
  Interest and discount earned .........    $11,172,278
                                            -----------

Expenses
  Investment advisory ..................        682,680
  Administration .......................        292,577
  Auction agent ........................        191,500
  Custodian ............................         51,500
  Directors ............................         36,000
  Reports to shareholders ..............         29,500
  Legal ................................         15,500
  Registration .........................         15,500
  Independent accountants ..............         12,500
  Transfer agent .......................         11,500
  Miscellaneous ........................         35,183
                                            -----------
  Total expenses .......................      1,373,940
                                            -----------
Net investment income ..................      9,798,338
                                            -----------

REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS
Net realized loss on investments .......        (58,690)
Net change in unrealized appreciation on
  investments ..........................      4,435,066
                                            -----------
Net gain on investments ................      4,376,376
                                            -----------
NET INCREASE IN NET INVESTMENT ASSETS
RESULTING FROM OPERATIONS ..............    $14,174,714
                                            ===========

                       See Notes to Financial Statements.

                                       10


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS (UNAUDITED)
--------------------------------------------------------------------------------



                                                                    SIX MONTHS ENDED    YEAR ENDED
                                                                       APRIL  30,       OCTOBER 31,
                                                                          2001             2000
                                                                    ----------------   -------------
                                                                                 
INCREASE (DECREASE) IN NET INVESTMENT ASSETS

OPERATIONS:
  Net investment income ...........................................   $   9,798,338    $  18,877,184
  Net realized loss on investments ................................         (58,690)      (5,068,444)
  Net change in unrealized appreciation on investments ............       4,435,066       12,219,832
                                                                      -------------    -------------
    Net increase in net investment assets resulting from operations      14,174,714       26,028,572
                                                                      -------------    -------------

DIVIDENDS AND DISTRIBUTIONS:
  To common shareholders from net investment income ...............      (6,515,470)     (13,953,202)
  To preferred shareholders from net investment income ............      (2,851,760)      (5,841,351)
                                                                      -------------    -------------
    Total dividends and distributions .............................      (9,367,230)     (19,794,553)
                                                                      -------------    -------------

CAPITAL STOCK TRANSACTIONS:
  Net proceeds from additional issuance of preferred shares .......              --       16,080,131
                                                                      -------------    -------------
    Total increase ................................................       4,807,484       22,314,150
                                                                      -------------    -------------

NET INVESTMENT ASSETS
Beginning of period ...............................................     385,399,397      363,085,247
                                                                      -------------    -------------
End of period (including undistributed net investment income
  of $708,563 and $277,455, respectively) .........................   $ 390,206,881    $ 385,399,397
                                                                      =============    =============








                       See Notes to Financial Statements.

                                       11


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
--------------------------------------------------------------------------------




                                                                                              YEAR ENDED OCTOBER 31,
                                                            SIX MONTHS ENDED  ----------------------------------------------------
                                                             APRIL 30, 2001     2000       1999       1998       1997       1996
                                                             --------------     ----       ----       ----       ----       ----

                                                                                                        
PER COMMON SHARE OPERATING PERFORMANCE:
NET ASSET VALUE, BEGINNING OF PERIOD .......................... $  14.30      $  13.95   $  15.78   $  15.32   $  14.52   $  14.18
                                                                --------      --------   --------   --------   --------   --------
  Net investment income .......................................      .59          1.13       1.09       1.08       1.08       1.09
  Net realized and unrealized gain (loss) on
    investments ...............................................      .25           .43      (1.63)       .70        .80        .34
                                                                --------      --------   --------   --------   --------   --------
Net increase (decrease) from investment operations ............      .84          1.56       (.54)      1.78       1.88       1.43
                                                                --------      --------   --------   --------   --------   --------
Dividends and distributions:
  Dividends from net investment income to:
    Common shareholders .......................................     (.39)         (.83)      (.86)      (.81)      (.78)      (.79)
    Preferred shareholders ....................................     (.17)         (.35)      (.24)      (.24)      (.27)      (.28)
  Distributions from net realized gain on investments to:
    Common shareholders .......................................     --            --         (.15)      (.20)      (.02)      (.01)
    Preferred shareholders ....................................     --            --         (.04)      (.07)      (.01)      (.01)
                                                                --------      --------   --------   --------   --------   --------
TOTAL DIVIDENDS AND DISTRIBUTIONS .............................    (0.56)        (1.18)     (1.29)     (1.32)     (1.08)     (1.09)
                                                                --------      --------   --------   --------   --------   --------
Capital change with respect to issuance of preferred shares ...     --            (.03)      --         --         --         --
                                                                --------      --------   --------   --------   --------   --------
Net asset value, end of period* ............................... $  14.58      $  14.30   $  13.95   $  15.78   $  15.32   $  14.52
                                                                ========      ========   ========   ========   ========   ========
Market value, end of period* .................................. $  13.38      $  12.13   $  13.13   $  15.44   $  13.38   $  12.44
                                                                ========      ========   ========   ========   ========   ========
TOTAL INVESTMENT RETURN+ ......................................    13.67%        (1.27)%    (9.03)%    23.81%     14.39%     10.41%
                                                                ========      ========   ========   ========   ========   ========

RATIOS TO AVERAGE NET ASSETS OF COMMON
  SHAREHOLDERS++:
Expenses ......................................................     1.12%+++      1.20%      1.05%      1.04%      1.07%      1.12%
Net investment income before preferred stock dividends ........     8.04%+++      8.18%      7.21%      6.95%      7.42%      7.57%
Preferred stock dividends .....................................     2.34%+++      2.53%      1.60%      1.53%      1.88%      1.97%
Net investment income available to common shareholders ........     5.70%+++      5.65%      5.61%      5.42%      5.54%      5.60

SUPPLEMENTAL DATA:
Average net assets of common shareholders (in thousands) ...... $245,708      $230,746   $252,536   $259,280   $243,947   $238,540
Portfolio turnover ............................................        0%           35%        26%        46%       160%       164%
Net assets of common shareholders, end of period (in thousands) $243,657      $238,849   $233,085   $263,590   $255,926   $242,547
Preferred stock outstanding (in thousands) .................... $146,550      $146,550   $130,000   $130,000   $130,000   $130,000
Asset coverage per share of preferred stock, end of period .... $ 66,565      $ 65,745   $ 69,824   $ 75,690   $ 74,241   $ 71,644


-----------
  * Net asset value and market value are published  in BARRON'S  on Saturday and
    THE WALL STREET JOURNAL on Monday.
  + Total investment return is calculated assuming a purchase of common stock at
    the current market price on the first day and a
    sale at the  current  market  price on the last day of the period  reported.
    Dividends  and  distributions,  if any,  are  assumed  for  purposes of this
    calculation to be reinvested at prices  obtained under the Trust's  dividend
    reinvestment  plan.  Total  investment  return  does not  reflect  brokerage
    commissions.  Total  investment  returns for periods less than one full year
    are not annualized.
 ++ Ratios are calculated on the basis of income and expenses applicable to both
    the common and  preferred stock relative to the average net assets of common
    shareholders.
+++ Annualized.

The information above represents the unaudited operating  performance data for a
share of common stock outstanding,  total investment  return,  ratios to average
net  assets  and  other  supplemental  data  for  the  periods  indicated.  This
information has been determined based upon financial information provided in the
financial statements and market value data for the Trust's common shares.

                       See Notes to Financial Statements.

                                       12


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
--------------------------------------------------------------------------------

NOTE 1. ORGANIZATION & ACCOUNTING POLICIES

   The  BlackRock  Investment  Quality  Municipal  Trust Inc.  (the "Trust") was
organized  in  Maryland  on  November  19,  1992  as a  diversified,  closed-end
management  investment company.  The Trust's investment objective is to manage a
portfolio of investment  quality  securities while providing high current income
exempt from regular  Federal  income tax  consistent  with the  preservation  of
capital.  The  ability of issuers of debt  securities  held by the Trust to meet
their  obligations  may be  affected  by  economic  developments  in a  specific
industry  or  region.  No  assurance  can be given that the  Trust's  investment
objective will be achieved.

   The following is a summary of significant accounting policies followed by the
Trust.

SECURITIES VALUATION:  Municipal securities  (including  commitments to purchase
such  securities  on a  "when-issued"  basis)  are valued on the basis of prices
provided  by  dealers or  pricing  services  approved  by the  Trust's  Board of
Directors.  In determining the value of a particular security,  pricing services
may use certain  information  with respect to transactions  in such  securities,
quotations from bond dealers,  market transactions in comparable  securities and
various  relationships  between  securities in  determining  values.  Short-term
securities  are valued at amortized  cost.  Any  securities  or other assets for
which such current  market  quotations  are not readily  available are valued at
fair value as determined in good faith under procedures established by and under
the general supervision and responsibility of the Trust's Board of Directors.

SECURITIES  TRANSACTIONS  AND INVESTMENT  INCOME:  Securities  transactions  are
recorded on trade date.  Realized and unrealized gains and losses are calculated
on the identified  cost basis.  Interest income is recorded on the accrual basis
and  the  Trust  accretes  original  issue  discount  or  amortizes  premium  on
securities purchased using the interest method.

FEDERAL  INCOME  TAXES:  It is the  Trust's  intention  to  continue to meet the
requirements  of the Internal  Revenue Code  applicable to regulated  investment
companies  and to distribute  sufficient  net income to  shareholders.  For this
reason and because  substantially  all of the Trust's  gross income  consists of
tax-exempt interest, no Federal income tax provision is required.

DIVIDENDS  AND  DISTRIBUTIONS:   The  Trust  declares  and  pays  dividends  and
distributions to common  shareholders  monthly from net investment  income,  net
realized short-term capital gains and other sources, if necessary. Net long-term
capital  gains,  if any,  in excess  of loss  carryforwards  may be  distributed
annually.  Dividends and  distributions  are recorded on the  ex-dividend  date.
Dividends and distributions to preferred shareholders are accrued and determined
as described in Note 4.

ESTIMATES: The preparation of financial statements in conformity with accounting
principles   generally  accepted  in  the  United  States  of  America  requires
management to make estimates and assumptions that affect the reported amounts of
assets and  liabilities  and disclosure of contingent  assets and liabilities at
the date of the financial  statements  and the reported  amounts of revenues and
expenses  during the reporting  period.  Actual  results could differ from those
estimates.

DEFERRED  COMPENSATION PLAN: Under a deferred  compensation plan approved by the
Board of Directors on February 24, 2000,  non-interested  Directors may elect to
defer receipt of all or a portion of their annual compensation.

   Deferred amounts earn a return for the Directors as though  equivalent dollar
amounts had been invested in common shares of other  BlackRock funds selected by
the  Directors.  This has the same  economic  effect for the Directors as if the
Directors had invested the deferred amounts in such other BlackRock funds.

   The  deferred  compensation  plan is not  funded and  obligations  thereunder
represent  general unsecured claims against the general assets of the Trust. The
Trust may, however,  elect to invest in common shares of those funds selected by
the Directors in order to match its deferred compensation obligations.

NEW ACCOUNTING POLICIES:  The Trust will adopt the provisions of the AICPA Audit
and Accounting Guide for Investment Companies, as revised,  effective for fiscal
years  beginning  after  December  15, 2000.  As required,  the Trust will begin
amortizing  discounts on debt securities  effective  November 1, 2001.  Prior to
this date,  the Trust  amortized  premiums and original  issue  discount on debt
securities but did not amortize market discount.  The cumulative  effect of this
accounting  change will have no impact on the total net assets of the Trust. The
impact of this accounting  change is anticipated to have an immaterial effect on
the  financial  statements  and will result in an increase to cost of securities
and a corresponding decrease in net unrealized appreciation, based on securities
held as of October 31, 2001.

NOTE 2. AGREEMENTS

   The Trust has an Investment Advisory Agreement with BlackRock Advisors, Inc.,
(the "Advisor"), which is a wholly-owned subsidiary of BlackRock, Inc., which in
turn is an indirect,  majority-owned subsidiary of PNC Financial Services Group,
Inc. The Trust has an Administration Agreement with

                                       13



Princeton Administrators,  L.P. (the "Administrator"),  an indirect wholly-owned
affiliate of Merrill Lynch & Co., Inc.

   The  investment  advisory  fee paid to the  Advisor  is  computed  weekly and
payable  monthly at an annual  rate of 0.35% of the Trust's  average  weekly net
investment  assets.  The  administration  fee paid to the  Administrator is also
computed  weekly and  payable  monthly at an annual rate of 0.15% of the Trust's
average  weekly  net  investment  assets,  subject to a minimum  monthly  fee of
$12,500.

   Pursuant to the agreements,  the Advisor provides  continuous  supervision of
the investment  portfolio and pays the compensation of officers of the Trust who
are  affiliated  persons of the Advisor.  The  Administrator  pays occupancy and
certain  clerical and accounting  costs of the Trust.  The Trust bears all other
costs and expenses.

NOTE 3. PORTFOLIO SECURITIES

     Sales of investment  securities,  other than short-term investments for the
period  ended April 30, 2001  aggregated  $1,174,410.  There were no  purchases,
other than short-term investments, during the period ended April 30, 2001.

   The  Trust  may  invest  in  securities  which  are not  readily  marketable,
including  those which are  restricted as to  disposition  under  securities law
("restricted  securities").  At April 30,  2001,  the  Trust  held 6% of its net
assets in securities restricted as to resale.

   The Federal income tax basis of the Trust's investments at April 30, 2001 was
$367,921,783,  and  accordingly,  net unrealized  appreciation  was  $16,612,662
(gross  unrealized  appreciation--$19,999,556,  gross unrealized  depreciation--
$3,386,894).

   For federal income tax purposes, the Trust had a capital loss carryforward at
October 31, 2000 of  approximately  $5,381,000 of which  $312,000 will expire in
2007  and  $5,069,000  will  expire  in  2008.  Accordingly,   no  capital  gain
distribution  is expected to be paid to  shareholders  until net gains have been
realized in excess of such amount.

NOTE 4. CAPITAL

   There are 200 million shares of $.01 par value common stock  authorized.  The
Trust may classify or reclassify any unissued shares of common stock into one or
more series of preferred stock. Of the 16,707,093  common shares  outstanding at
April 30, 2001, the Advisor owned 7,205 shares. As of April 30, 2001, there were
5,862 shares of preferred  stock  outstanding as follows:  Series  T7--3,262 and
Series  T28--2,600,  which  includes 662 shares of series T7 issued on March 10,
2000.

   On March 10,  2000,  the Trust  reclassified  662 shares of common  stock and
issued an additional  662 shares of Series T7 preferred  stock.  The  additional
shares  issued have  identical  rights and  features of the  existing  Series T7
preferred stock.  Estimated offering cost of $304,369 and underwriting  discount
of $165,500 have been charged to paid-in  capital in excess of par of the common
shares.

   Dividends on Series T7 are  cumulative  at a rate which is reset every 7 days
based on the results of an auction.  Dividends on Series T28 are also cumulative
at a rate  which is reset  every 28 days  based on the  results  of an  auction.
Dividend  rates  ranged  from 2.90% to 5.10%  during the period  ended April 30,
2001.

   The Trust may not declare dividends or make other  distributions on shares of
common  stock or purchase  any such  shares if, at the time of the  declaration,
distribution,  or  purchase,  asset  coverage  with  respect to the  outstanding
preferred stock would be less than 200%.

   The preferred  stock is redeemable at the option of the Trust, in whole or in
part, on any dividend  payment date at $25,000 per share plus any accumulated or
unpaid dividends whether or not declared. The preferred stock is also subject to
mandatory  redemption  at  $25,000  per  share  plus any  accumulated  or unpaid
dividends,  whether or not  declared,  if certain  requirements  relating to the
composition  of the  assets  and  liabilities  of the  Trust as set forth in the
Articles of Incorporation are not satisfied.

   The holders of  preferred  stock have voting  rights  equal to the holders of
common stock (one vote per share) and will vote  together with holders of shares
of common stock as a single class. However,  holders of preferred stock are also
entitled to elect two of the Trust's  directors.  In  addition,  the  Investment
Company Act of 1940 requires that along with approval by stockholders that might
otherwise  be  required,  the  approval  of the  holders  of a  majority  of any
outstanding  preferred stock,  voting separately as a class would be required to
(a) adopt any plan of  reorganization  that would adversely affect the preferred
stock, and (b) take any action requiring a vote of security holders,  including,
among other  things,  changes in the Trust's  subclassification  as a closed-end
investment company or changes in its fundamental investment restrictions.



NOTE 5. DIVIDENDS AND DISTRIBUTIONS

   Subsequent to April 30, 2001,  the Board of Directors of the Trust declared a
dividend from undistributed  earnings of $0.065 per common share payable June 1,
2001, to shareholders of record on May 15, 2001.

   For the period May 1, 2001 to May 31, 2001,  dividends  declared on Preferred
Stock totalled  $411,085 in aggregate for the two  outstanding  preferred  stock
series.

                                       14


--------------------------------------------------------------------------------
              THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                           DIVIDEND REINVESTMENT PLAN
--------------------------------------------------------------------------------

   Pursuant to the  Trust's  Dividend  Reinvestment  Plan (the  "Plan"),  common
shareholders are  automatically  enrolled to have all distributions of dividends
and capital  gains  reinvested by State Street Bank and Trust Company (the "Plan
Agent") in Trust  shares  pursuant  to the Plan.  Shareholders  who elect not to
participate in the Plan will receive all  distributions in cash paid by check in
United States dollars mailed  directly to the  shareholders of record (or if the
shares are held in street or other  nominee  name,  then to the  nominee) by the
transfer agent, as dividend disbursing agent.

   The Plan Agent  serves as agent for the  shareholders  in  administering  the
Plan.  After the Trust  declares a dividend or determines to make a capital gain
distribution,  the Plan Agent will, as agent for the  participants,  receive the
cash  payment and use it to buy Trust  shares in the open market on the New York
Stock Exchange or elsewhere for the participants'  accounts.  The Trust will not
issue any new shares under the Plan.

   Participants  in the Plan may withdraw  from the Plan upon written  notice to
the Plan Agent and will receive  certificates  for whole Trust shares and a cash
payment for any fraction of a Trust share.

   The Plan Agent's fees for the handling of the  reinvestment  of dividends and
distributions  will be paid by the Trust.  However,  each participant will pay a
pro rata  share of  brokerage  commissions  incurred  with  respect  to the Plan
Agent's open market  purchases in connection with the  reinvestment of dividends
and  distributions.  The automatic  reinvestment of dividends and  distributions
will not relieve  participants  of any Federal income tax that may be payable on
such dividends or distributions.

   The Trust reserves the right to amend or terminate the Plan as applied to any
dividend or distribution paid subsequent to written notice of the change sent to
all  shareholders  of the Trust at least 90 days  before the record date for the
dividend or distribution. The Plan also may be amended or terminated by the Plan
Agent upon at least 90 days' written  notice to all  shareholders  of The Trust.
All  correspondence  concerning the Plan should be directed to the Plan Agent at
(800) 699-1BFM. The address is on the front of this report.




                                       15




--------------------------------------------------------------------------------
              THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                             ADDITIONAL INFORMATION
--------------------------------------------------------------------------------

   Quarterly  performance and other information regarding the Trust may be found
on      BlackRock's      website,      which     can     be      accessed     at
http://www.blackrock.com/funds/cefunds.html.   This   reference  to  BlackRock's
website is intended to allow  investors  public access to quarterly  information
regarding the Trust and is not intended to incorporate  BlackRock's website into
this report.

ANNUAL MEETING OF TRUST SHAREHOLDERS. There have been no material changes in the
Trust's  investment  objectives  or policies  that have not been approved by the
shareholders  or to its  charter  or by-laws or in the  principal  risk  factors
associated  with  investment  in The  Trust.  There  have been no changes in the
persons who are  primarily  responsible  for the  day-to-day  management  of the
Trust's portfolio.

     The Annual Meeting of Trust  Shareholders  was held on May 24, 2001 to vote
on the following matter:

     To elect three Directors as follows:

          DIRECTOR:                            CLASS       TERM       EXPIRING
          --------                             -----       -----      --------
          Frank J. Fabozzi ...............      II        3 years       2004
          Walter F. Mondale ..............      II        3 years       2004
          Ralph L. Schlosstein ...........      II        3 years       2004

          Directors  whose term of office  continues  beyond  this  meeting  are
          Andrew F. Brimmer,  Richard E. Cavanagh,  Kent Dixon, Laurence D. Fink
          and James Clayburn La Force, Jr.

     Shareholders elected the three Directors. The results of the voting were as
follows:

                                         Votes For*  Votes Against* Abstentions*
                                         ---------   -------------  -----------
     Frank J. Fabozzi .................      5,650        --                 18
     Walter F. Mondale ................ 14,919,675        --            298,804
     Ralph L. Schlosstein ............. 14,979,178        --            239,301

-------------
* The votes  represent  common  and  preferred  shareholders  voting as a single
class.








                                       16


--------------------------------------------------------------------------------
              THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                               INVESTMENT SUMMARY
--------------------------------------------------------------------------------

THE TRUST'S INVESTMENT OBJECTIVE

The BlackRock  Investment Quality Municipal Trust's  investment  objective is to
provide high current  income exempt from regular  Federal  income tax consistent
with the preservation of capital.

WHO MANAGES THE TRUST?

BlackRock  Advisors,  Inc. (the "Advisor")  manages the Trust.  The Advisor is a
wholly-owned subsidiary of BlackRock,  Inc.  ("BlackRock"),  which is one of the
largest  publicly traded  investment  management firms in the United States with
$202 billion of assets under management as of March 31, 2001.  BlackRock manages
assets on  behalf  of more  than  3,300  institutions  and  200,000  individuals
worldwide, including nine of the ten largest companies in the U.S. as determined
by Fortune Magazine,  through a variety of equity,  fixed income,  liquidity and
alternative  investment  separate  accounts  and  mutual  funds,  including  the
BLACKROCK  FUNDS and  BLACKROCK  PROVIDENT  INSTITUTIONAL  FUNDS.  In  addition,
BlackRock  provides risk management and technology  services to a growing number
of  institutional  investors  under the BLACKROCK  SOLUTIONS  name.  Clients are
served from  BlackRock's  headquarters  in New York City,  as well as offices in
Wilmington, DE, Edinburgh, Scotland, Tokyo, Japan, and Hong Kong. BlackRock is a
member of The PNC Financial  Services Group,  Inc.  ("PNC"),  one of the largest
diversified  financial  services  organizations  in the  United  States,  and is
majority-owned by PNC and by BlackRock employees.

WHAT CAN THE TRUST INVEST IN?

Under normal  conditions,  the Trust expects to continue to manage its assets so
that at least 80% of its investments are rated at least  investment grade ("BBB"
by Standard & Poor's or "Baa" by Moody's Investor Services) and up to 20% of its
assets may instead be deemed to be of equivalent  credit quality by the Advisor.
Examples of the types of securities that the Trust may invest in include general
obligation bonds,  which are backed by the full taxing power of the municipality
(states,  counties and cities), and revenue bonds, which are backed by a revenue
source  associated with the issuing  municipality  or by a special tax.  Revenue
bonds  include  those that are backed by  revenues  generated  by  universities,
hospitals,  housing  developments,  utilities,  public  facilities,  toll roads,
airports, etc.

WHAT IS THE ADVISOR'S INVESTMENT STRATEGY?

The Advisor will manage the assets of the Trust in  accordance  with the Trust's
investment  objective and policies to seek to achieve its objective by investing
in municipal  debt  securities  that are  diversified  both  geographically  and
according to revenue source. As such, the Advisor actively manages the assets in
relation  to market  conditions  and  interest  rate  changes.  In  seeking  the
investment  objective,  the Trust does not expect to invest more than 25% of its
total assets in municipals that are issued by the same state. Depending on yield
and  portfolio  allocation  considerations,  the  Advisor may choose to invest a
portion of the Trust's  assets in securities  which pay interest that is subject
to AMT (alternative minimum tax).

Under current market conditions the use of leverage  increases the income earned
by the Trust.  The Trust  employs  leverage  primarily  through the  issuance of
preferred  stock.   Preferred  stockholders  will  receive  dividends  based  on
short-term rates in exchange for allowing the Trust to borrow additional assets.
These assets will be invested in longer-term assets which typically offer higher
interest  rates and the  difference  between the cost of the  dividends  paid to
preferred  stockholders  and the interest earned on the  longer-term  securities
will provide higher income levels for common  stockholders in most interest rate
environments. See "Leverage Considerations in the Trust" below.

HOW ARE THE TRUST'S SHARES PURCHASED AND SOLD? DOES THE TRUST PAY DIVIDENDS
REGULARLY?

The  Trust's  common  shares  are traded on the New York  Stock  Exchange  which
provides investors with liquidity on a daily basis. Orders to buy or sell shares
of The Trust must be placed  through a registered  broker or financial  advisor.
The Trust pays monthly  dividends which are typically paid on the first business
day of the month. For shares held in the shareholder's

                                       17


name,  dividends may be reinvested in additional shares of the Trust through the
Trust's transfer agent, State Street Bank and Trust Company.  Investors who wish
to hold shares in a brokerage  account should check with their financial advisor
to determine whether their brokerage firm offers dividend reinvestment services.

LEVERAGE CONSIDERATIONS IN THE TRUST

Leverage  increases  the duration (or price  sensitivity  of the net assets with
respect to changes  in  interest  rates) of the  Trust,  which can  improve  the
performance  of the Trust in a  declining  rate  environment,  but can cause net
assets to decline  faster  than the  market in a rapidly  rising  interest  rate
environment.  The Trust may reduce,  or unwind,  the amount of leverage employed
should the Advisor  consider that  reduction to be in the best  interests of the
Trust.  The  Advisor's  portfolio  managers  continuously  monitor and regularly
review the  Trust's  use of  leverage  and  maintain  the  ability to unwind the
leverage if that course is chosen.

SPECIAL CONSIDERATIONS AND RISK FACTORS RELEVANT TO THE TRUST

THE TRUST IS  INTENDED  TO BE A  LONG-TERM  INVESTMENT  AND IS NOT A  SHORT-TERM
TRADING VEHICLE.

INVESTMENT  OBJECTIVE.  Although  the  objective of the Trust is to provide high
current  income  exempt from  regular  Federal  income tax  consistent  with the
preservation  of capital,  there can be no assurance that this objective will be
achieved.

DIVIDEND  CONSIDERATIONS.  The income and dividends paid by the Trust are likely
to vary over time as fixed income market conditions change. Future dividends may
be higher or lower than the dividend the Trust is currently paying.

LEVERAGE.  The Trust utilizes  leverage through the issuance of preferred stock,
which involves special risks. The Trust's net asset value and market value maybe
more volatile due to its use of leverage.

MARKET PRICE OF SHARES.  The shares of closed-end  investment  companies such as
the Trust trade on the New York Stock  Exchange  (NYSE symbol:  BKN) and as such
are subject to supply and demand influences.  As a result, shares may trade at a
discount or a premium to their net asset value.

INVESTMENT GRADE MUNICIPAL  OBLIGATIONS.  The value of municipal debt securities
generally  varies  inversely with changes in prevailing  market  interest rates.
Depending  on the amount of call  protection  that the  securities  in the Trust
have, the Trust may be subject to certain  reinvestment risks in environments of
declining interest rates.

ILLIQUID  SECURITIES.  The Trust may  invest in  securities  that are  illiquid,
although  under current  market  conditions the Trust expects to do so to only a
limited extent. These securities involve special risks.

ANTITAKEOVER  PROVISIONS.  Certain antitakeover provisions will make a change in
the Trust's  business or management  more difficult  without the approval of the
Trust's Board of Directors and may have the effect of depriving  shareholders of
an  opportunity  to sell their shares at a premium above the  prevailing  market
price.




                                       18


--------------------------------------------------------------------------------
              THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                                    GLOSSARY
--------------------------------------------------------------------------------


CLOSED-END FUND:                   Investment  vehicle which initially  offers a
                                   fixed  number of shares and trades on a stock
                                   exchange.  The fund invests in a portfolio of
                                   securities  in  accordance  with  its  stated
                                   investment objectives and policies.

DISCOUNT:                          When a fund's net asset value is greater than
                                   its  stock  price  the  fund  is  said  to be
                                   trading at a discount.

DIVIDEND:                          Income generated by securities in a portfolio
                                   and  distributed  to  shareholders  after the
                                   deduction  of expenses.  This Trust  declares
                                   and pays dividends to common  shareholders on
                                   a monthly basis.

DIVIDEND REINVESTMENT:             Shareholders   may  have  all  dividends  and
                                   distributions of capital gains  automatically
                                   reinvested into additional shares of a fund.

MARKET PRICE:                      Price per share of a security  trading in the
                                   secondary market. For a closed-end fund, this
                                   is the  price at which  one share of the fund
                                   trades on the stock exchange.  If you were to
                                   buy or sell shares,  you would pay or receive
                                   the market price.

NET ASSET VALUE (NAV):             Net asset value is the total  market value of
                                   all  securities  and other assets held by the
                                   Trust,    plus   income    accrued   on   its
                                   investments,  minus any liabilities including
                                   accrued expenses, divided by the total number
                                   of  outstanding  common  shares.  It  is  the
                                   underlying  value of a single common share on
                                   a given day. Net asset value for the Trust is
                                   calculated  weekly and  published in BARRON'S
                                   on Saturday  and THE WALL  STREET  JOURNAL on
                                   Monday.

PREMIUM:                           When a fund's stock price is greater than its
                                   net  asset  value,  the  fund  is  said to be
                                   trading at a premium.

PREREFUNDED BONDS:                 These securities are  collateralized  by U.S.
                                   Government   securities  which  are  held  in
                                   escrow  and  are  used to pay  principal  and
                                   interest on the  tax-exempt  issue and retire
                                   the  bond  in  full  at the  date  indicated,
                                   typically at a premium to par.








                                       19


---------
BLACKROCK
---------

DIRECTORS
Laurence D. Fink, CHAIRMAN
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Clayburn La Force, Jr.
Walter F. Mondale
Ralph L. Schlosstein

OFFICERS                                            THE BLACKROCK
Ralph L. Schlosstein, PRESIDENT                     INVESTMENT QUALITY
Keith T. Anderson, VICE PRESIDENT                   MUNICIPAL TRUST INC.
Michael C. Huebsch, VICE PRESIDENT                  ====================
Robert S. Kapito, VICE PRESIDENT                    SEMI-ANNUAL REPORT
Kevin Klingert, VICE PRESIDENT                      APRIL 30, 2001
Richard M. Shea, VICE PRESIDENT/TAX
Henry Gabbay, TREASURER
James Kong, ASSISTANT TREASURER
Anne Ackerley, SECRETARY

INVESTMENT ADVISOR
BlackRock Advisors, Inc.
100 Bellevue Parkway
Wilmington, DE 19809
(800) 227-7BFM

ADMINISTRATOR
Princeton Administrators, L.P.
P.O. Box 9095
Princeton, NJ 08543-9095
(800) 543-6217

CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
One Heritage Drive
North Quincy, MA 02171
(800) 699-1BFM

AUCTION AGENT
Deutsche Bank
4 Albany Street
New York, NY 10006

INDEPENDENT ACCOUNTANTS
Deloitte & Touche LLP
Two World Financial Center
New York, NY 10281-1434

LEGAL COUNSEL
Skadden, Arps, Slate, Meagher & Flom LLP
Four Times Square
New York, NY 10036

LEGAL COUNSEL -- INDEPENDENT DIRECTORS
Debevoise & Plimpton
875 Third Avenue
New York, NY 10022

   The accompanying  financial  statements
as of April 30,  2001 were not audited and
accordingly,  no opinion is  expressed  on
them.

   This   report   is   for    shareholder
information.  This  is  not  a  prospectus
intended  for use in the  purchase or sale
of any securities.

     THE BLACKROCK INVESTMENT QUALITY
           MUNICIPAL TRUST INC.
    c/o Princeton Administrators, L.P.
               P.O. Box 9095
         Princeton, NJ 08543-9095
              (800) 543-6217

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