BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC
N-30D, 1995-08-28
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--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
--------------------------------------------------------------------------------
 
                                                                   July 14, 1995
 
Dear Shareholder:
 
   The fixed income markets benefitted from extremely bullish sentiment and
rallied during the semi-annual period between January 1, 1995 and June 30, 1995.
The U.S. economy appears to have responded to the Fed's vigilance toward
inflation with low absolute levels of inflation and moderate rates of growth.
This scenario is suggestive of a "soft landing" for the economy, which has
sparked a significant Treasury market rally and resulted in overall strength in
most fixed income markets. Closed-end bond funds responded to the broader
markets by staging a significant rebound during the first six months of 1995
from their all-time low stock prices during the fourth quarter of 1994.
 
   BlackRock Financial Management, Inc., your Trust's investment adviser, is
pleased to report that its acquisition by PNC Bank, N.A. ("PNC") was officially
completed on February 28, 1995. PNC is a commercial bank whose principal office
is in Pittsburgh, Pennsylvania and is wholly-owned by PNC Bank Corp., a bank
holding company. The merger was structured to assure continuity of performance
and service through stability of our organization. BlackRock retains its name
and continues to operate out of its New York office. All members of BlackRock's
management team have signed long-term employment contracts and will continue to
be responsible for managing BlackRock's business so that shareholders will
notice no changes in the management of the Trust.
 
   You will note several enhancements to the Trust's semi-annual report designed
to improve the report's usefulness to you. The letter to shareholders which
reviews the markets and the Trust's investment strategy over the semi-annual
period is provided by the Trust's portfolio managers. In addition, we have
included an investment summary section which provides a synopsis of the Trust's
investment objectives and guidelines and reviews its investment strategy. We
appreciate your investment in The BlackRock Insured Municipal 2008 Term Trust
Inc. and look forward to continuing to serve your financial needs.
 
Sincerely,
 
/s/ Laurence D. Fink                         /s/ Ralph L. Schlosstein

    Laurence D. Fink                             Ralph L. Schlosstein
    Chairman                                     President
 
                                       1
<PAGE>
                                                                   July 14, 1995
 
Dear Shareholder,
 
   We are pleased to present the semi-annual report for The BlackRock Insured
Municipal 2008 Term Trust Inc. ("BRM" or the "Trust") for the period ended June
30, 1995. The past six months have witnessed a tremendous turnaround from the
poor performance of fixed income markets during 1994. At December 31, 1994, the
Trust was trading at a stock price of $12.25, but had risen to $13.75 as of June
30, 1995. The net asset value of the fund has responded to the rally in the
municipal markets and has increased since the start of the year from $13.88 to
$15.24 at the end of the second quarter.
 
   As of the date of this letter, the Trust had a stock price of $13.375 per
share, and was trading at a 13.71% discount to its net asset value of $15.50 per
share. This discount reflects the weakness in stock prices of closed-end
municipal bond funds, with more than 90% of such funds currently trading at
discounts to net asset value according to Lipper Analytical Services, Inc. The
Trust's current monthly dividend per share is $0.06625, which is equivalent to
an annualized yield of 5.94% on the current stock price and a taxable equivalent
yield of 9.84% based on a Federal 39.6% tax bracket.
 
   The Trust's monthly dividend has been reduced effective June 1995 as a result
of a decline in the amount of income which the Trust earns from leverage. The
Trust remains on track to achieve its primary objective to return $15 per share
to investors on or about December 31, 2008.
 
   The following summary provides a review of the fixed income markets over the
past six months as well as the trading activity in the Trust's portfolio that
has taken place since our last Shareholder's Report. This information should
provide you with a greater understanding of the types of active management
strategies we employ at BlackRock.
 
THE FIXED INCOME MARKETS
 
   In sharp contrast to 1994, the fixed income markets have rallied
substantially year-to-date, largely the result of a general comfort level with
the rate of inflation. In fact, the Federal Reserve recently eased its monetary
policy, modestly lowering the Federal funds target rate by 25 basis points (or
0.25%) to 5.75% on July 7, after one and a half years of exercising tighter
monetary control through seven consecutive interest rate increases. The move
comes as a response to successive weak economic reports on unemployment and
manufacturing inventories which imply a slow rate of growth in the economy and
the Federal Reserve's concern over a possible recession.
 
   The municipal market showed strong performance for the first two quarters of
1995, but remained overshadowed by the rally in the Treasury market. From
December 31, 1994 to March 31, 1995, yields across maturities of AAA general
obligation bonds fell over 63 basis points. However, during the second quarter
the AAA muni curve steepened as short and intermediate term municipal securities
rallied and the yield on 30 year AAA municipal bonds remained virtually
unchanged, despite an 81 basis point fall in the Treasury long bond.
 
   The demand for shorter paper stems principally from current concerns about
tax reform proposals, particularly the creation of a "flat tax." Some versions
of this proposal would eliminate the taxation of all investment income, which
would eliminate the current tax benefits of municipal bonds versus Treasuries
and other taxable investments. This could result in the underperformance of the
municipal market if the flat tax becomes a pivotal 1996 Presidential campaign
issue. While actual tax reform is at best two years away, we will continue to
actively follow the situation because investor concerns about tax reform could
cause dislocations in the municipal market, creating possible buying
opportunities for the Trust. At the close of the second quarter, the municipal
market had priced in a 20-21% flat tax rate on investment income. BlackRock
believes that the flat tax reform will not pass in its current form of
pre-election year rhetoric, but also believes it is essential to be aware of its
effects upon the trading environment for municipal securities.
 
   The municipal market had anticipated benefits from seasonal summer demand of
approximately $65 billion in coupon payments and redemptions in June and July
looking for reinvestment, but this demand did not fully materialize as the
rallying stock market drew the attention of retail investors. Supply was very
low, as new issuance of municipal debt is expected to be 35% lower than last
year. The fears of tax reform outweigh these factors as municipal securities
currently trade relatively cheap to their taxable counterparts.
 
                                       2
<PAGE>
THE TRUST'S PORTFOLIO AND INVESTMENT STRATEGY
 
   The Trust invests in a portfolio of high credit quality (AAA) tax-exempt
general obligation and revenue bonds. The securities in the portfolio are
insured as to timely payment of interest and principal, and currently 100% are
not subject to the Alternative Minimum Tax (AMT). BlackRock has managed the
Trust's portfolio to selectively modify its allocation to certain sectors,
issuers, revenue sources, and types of bonds.
 
   The following chart illustrates the changes in the sector allocation of the
portfolio since the end of the last fiscal period.
 
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
 
  SECTOR                 JUNE 30, 1995       DECEMBER 31, 1994

  County, City & State        34%                   34%
  Utility                     19%                   14%
  Hospital                    15%                   16%
  Transportation               8%                    7%
  Water & Sewer                6%                    9%
  Lease Revenue                5%                    5%
  Housing                      3%                    2%
  Building                     1%                    1%
  Education                    1%                    1%
  Tax Revenue                  1%                    1%
  Other                        7%                   10%
 
   Consistent with the Trust's objective to return $15 on or about December 31,
2008, the Trust's portfolio consists of securities with average maturities of
approximately 13 years and ratings of "AAA" by Standard & Poor's Corporation or
Moody's Investors Services or securities that are insured by a municipal bond
insurance company whose long-term obligations are rated "AAA." In addition, the
Trust is rated AAAf by Standard & Poor's.
 
   To enhance income, the Trust utilizes leverage through the issuance of
preferred stock, through which we can borrow at short-term tax-exempt rates and
earn the difference between that cost of borrowing and the yield on longer-term
assets purchased with those borrowings. The degree to which the Trust can
benefit from its use of leverage affects the ability of the Trust to pay high
monthly income and, as a result, sustained large increases in short-term rates
would negatively impact the amount of income that the Trust can derive from its
use of leverage. We will keep you informed of the effects, if any, on the
Trust's dividend paying abilities over time.
 
                                       3
<PAGE>
   We thank you for your investment in The BlackRock Insured Municipal 2008 Term
Trust Inc. Please feel free to contact us at (800) 227-7BFM (7236) if you have
specific questions which were not addressed in this report.
 

/s/ Robert S. Kapito                   /s/ Kevin Klingert

    Robert S. Kapito                       Kevin Klingert
    Vice Chairman and Portfolio Manager    Principal and Municipal Portfolio 
    BlackRock Financial Management, Inc.   Manager
                                           BlackRock Financial Management, Inc. 


<TABLE><CAPTION>

                            THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
<S>                                                                <C> 
Symbol on New York Stock Exchange:                                 BRM
Initial Offering Date:                                             September 18, 1992
Closing Stock Price as of 6/30/95:                                 $13.75
Net Asset Value as of 6/30/95:                                     $15.24
Yield on Closing Stock Price as of 6/30/95 ($13.75)1:               5.78%
Current Monthly Distribution per Common Share2:                   $0.06625
Current Annualized Distribution per Common Share2:                 $0.795
</TABLE>
 
--------------
 
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.
 
                                       4
<PAGE>
The BlackRock Insured
Municipal 2008 Term Trust Inc.
Portfolio of Investments
June 30, 1995
(Unaudited)
 
<TABLE><CAPTION>
--------------------------------------------------------------------------------------------------------------------
       PRINCIPAL
        AMOUNT                                                                                             VALUE
RATING*  (000)                                        DESCRIPTION                                        (NOTE 1)
--------------------------------------------------------------------------------------------------------------------
<S>  <C>     <C>                                                                                       <C>
             LONG-TERM INVESTMENTS--148.5%
             ALABAMA--0.2%
AAA  $  1,905 Mobile Impvt. Wt., Zero Coupon, 8/15/08, MBIA............................................. $     899,465
                                                                                                         -------------
             ARIZONA--0.4%
AAA     4,000 Chandler, G.O., Zero Coupon, 7/01/08, FGIC................................................     1,861,480
                                                                                                         -------------
             CALIFORNIA--1.6%
AAA     1,890 California Hlth. Facs. Fin. Auth. Rev., Marin Gen. Hosp., Ser. A, 5.75%, 8/01/09, FSA.....     1,894,177
AAA     5,000 California St. Pub. Wks. Brd. Lease Rev., Dept. of Corrections, Ser. C, 5.20%, 12/01/09, 
                MBIA...................................................................................      4,770,350
                                                                                                         -------------
                                                                                                             6,664,527
                                                                                                         -------------
             COLORADO--11.1%
AAA    30,205 Jefferson Cnty., Sch. Dist. No. R-001, G.O., 6.25%, 12/15/08, AMBAC.......................    31,776,566
AAA    13,285 Univ. of Colorado, Hosp. Auth. Rev., Ser. A, 6.25%, 11/15/08, AMBAC.......................    14,197,015
                                                                                                         -------------
                                                                                                            45,973,581
                                                                                                         -------------
             DISTRICT OF COLUMBIA--5.7%
             Dist. of Columbia, G.O., MBIA:
AAA     3,070   Ser. E, 5.875%, 6/01/08.................................................................     3,062,939
AAA    17,950   Ser. B, 6.30%, 6/01/09..................................................................    18,341,490
AAA     2,000 Dist. of Columbia, Hosp. Rev., Children's Hosp., Ser. A, 6.25%, 7/15/08, FGIC.............     2,038,600
                                                                                                         -------------
                                                                                                            23,443,029
                                                                                                         -------------
             FLORIDA--1.4%
AAA     5,795 Florida St. Brd. of Ed., Pub. Ed., Ser. B, 5.625%, 6/01/08, MBIA..........................     5,853,530
                                                                                                         -------------
             GEORGIA--1.8%
             Atlanta, C.O.P., Pretrial Det. Ctr., MBIA:
AAA     3,000   6.25%, 12/01/08.........................................................................     3,147,810
AAA     4,000   6.25%, 12/01/11.........................................................................     4,129,000
                                                                                                         -------------
                                                                                                             7,276,810
                                                                                                         -------------
             ILLINOIS--13.6%
AAA    14,205 Chicago O' Hare Intl. Arprt. Rev., Ser. A, 6.25%, 1/01/08, MBIA...........................    14,784,564
             Chicago, Sch. Fin. Auth., G.O., Ser. A, FGIC:
AAA    13,000   6.25%, 6/01/07..........................................................................    13,663,520
AAA     9,150   6.25%, 6/01/09..........................................................................     9,471,622
             Illinois Hlth. Facs. Auth. Rev.:
AAA     2,500   Carle Foundation, 6.75%, 1/01/10, FGIC..................................................     2,644,850
AAA    11,000   Alexian Med. Ctr. Proj., Ser. A, 4.10%++, 1/01/08, MBIA.................................    10,918,490
AAA    10,170 Met. Pier & Expo. Auth., Ded. St. Tax Rev., Ser. A, Zero Coupon, 6/15/08, FGIC............     4,709,524
                                                                                                         -------------
                                                                                                            56,192,570
                                                                                                         -------------
             INDIANA--2.5%
             Indiana Hlth. Fac. Fin. Auth. Hosp. Rev. & Impvt., Ancilla Sys. Inc., MBIA:
AAA     5,665   Ser. A, 6.25%, 7/01/08..................................................................     5,841,805
AAA     4,350   Ser. B, 6.25%, 7/01/08..................................................................     4,485,763
                                                                                                         -------------
                                                                                                            10,327,568
                                                                                                         -------------
             IOWA--2.0%
AAA     4,100 Iowa Fin. Auth., Sngl. Fam. Mtge. Rev., Ser. F, 6.35%, 7/01/09, AMBAC.....................     4,352,109
AAA     4,400 Muscatine, Elec. Rev., 5.00%, 1/01/08, CGIC...............................................     4,161,080
                                                                                                         -------------
                                                                                                             8,513,189
                                                                                                         -------------
</TABLE>
 
                       See Notes to Financial Statements.
                                       5
<PAGE>
<TABLE><CAPTION>
       PRINCIPAL
        AMOUNT                                                                                             VALUE
RATING*  (000)                                        DESCRIPTION                                        (NOTE 1)
--------------------------------------------------------------------------------------------------------------------
<S>  <C>     <C>                                                                                       <C>
             KENTUCKY--2.8%
AAA  $  9,000 Kentucky St. Tpke. Auth. Econ. Dev. Rd. Rev., 6.50%, 7/01/08, AMBAC....................... $   9,907,470
AAA     3,890 Owensboro, Elec. Lt. & Pwr. Rev., Ser. B, Zero Coupon, 1/01/09, AMBAC.....................     1,732,684
                                                                                                         -------------
                                                                                                            11,640,154
                                                                                                         -------------
             LOUISIANA--1.3%
AAA     5,000 Louisiana Pub. Facs. Auth. Hosp. Rev., Lafayette Gen. Med. Ctr. Proj., 6.30%, 10/01/08,   
                FSA.....................................................................................     5,234,850
                                                                                                         -------------
             MASSACHUSETTS--6.5%
AAA     4,465 Chelsea, Sch. Proj. Loan, 6.00%, 6/15/09, AMBAC...........................................     4,569,258
AAA     6,000 Massachusetts Bay Trans. Auth. Rev., Ser. B, 6.00%, 3/01/10, MBIA.........................     6,091,680
AAA    10,000 Massachusetts St. Hsg. Fin. Agcy., Hsg. Proj., Ser. A, 5.95%, 10/01/08, AMBAC.............    10,304,600
AAA     6,000 Massachusetts St., G.O., Ser. C, 5.20%, 8/01/08, FGIC.....................................     5,833,320
                                                                                                         -------------
                                                                                                            26,798,858
                                                                                                         -------------
             MICHIGAN--5.4%
             Lake Orion, Cmnty. Sch. Dist., AMBAC:
AAA     3,290   6.60%, 5/01/08..........................................................................     3,701,349
AAA     3,285   6.70%, 5/01/09..........................................................................     3,720,919
AAA     8,920 Michigan St. Bldg. Auth. Rev., Facs. Proj., Ser. IIA, 6.25%, 10/01/08, AMBAC..............     9,333,263
AAA     1,760 Western Michigan Univ. Rev., 6.20%, 11/15/08, FGIC........................................     1,850,482
AAA     3,400 Wyandotte, Elec. Rev., 6.25%, 10/01/08, MBIA..............................................     3,627,460
                                                                                                         -------------
                                                                                                            22,233,473
                                                                                                         -------------
             MISSOURI--1.7%
AAA     6,600 Kansas City, Sch. Dist. Bldg. Corp. Leasehold Rev., Cap. Impvts. Proj., Ser. A, 6.50%,   
                2/01/08, FGIC..........................................................................      7,008,672
                                                                                                         -------------
             NEVADA--4.1%
AAA     6,490 Clark Cnty., Fld. Ctrl., 6.30%, 11/01/05, AMBAC...........................................     6,856,296
             Washoe Cnty., Arpt. Auth., Ser. B, MBIA:
AAA     3,135   5.70%, 7/01/07..........................................................................     3,110,798
AAA     2,645   5.75%, 7/01/08..........................................................................     2,609,319
AAA     4,135 Washoe Cnty., Sch. District, G.O., Ser. A, 6.20%, 4/01/09, AMBAC..........................     4,261,117
                                                                                                         -------------
                                                                                                            16,837,530
                                                                                                         -------------
             NEW JERSEY--13.5%
AAA    30,275 New Jersey Econ. Dev. Auth., Mkt. Trans. Fac. Rev., Ser. A, 5.80%, 7/01/08, MBIA..........    30,643,144
AAA    24,495 New Jersey St. G.O., Ser. D, 6.00%, 2/15/09, MBIA.........................................    25,454,469
                                                                                                         -------------
                                                                                                            56,097,613
                                                                                                         -------------
             NEW YORK--7.4%
             New York City G.O., Ser. E, MBIA:
AAA     5,600   6.125%, 8/01/06.........................................................................     5,312,000
AAA    15,500   6.30%, 8/01/07..........................................................................    16,617,860
             New York St. Environ. Facs. Corp., Poll. Ctrl. Rev., Ser. D:
AAA     5,945   6.50%, 5/15/07..........................................................................     6,492,891
AAA     2,245   6.50%, 11/15/07.........................................................................     2,451,899
                                                                                                         -------------
                                                                                                            30,874,650
                                                                                                         -------------
             NORTH CAROLINA--9.0%
AAA     1,000 Cumberland Cnty. C.O.P., Civic Ctr. Proj., Ser. A, 6.375%, 12/01/09, AMBAC................     1,055,170
             North Carolina Eastn. Mun. Pwr. Agcy. Rev., Ser. B:
AAA    13,500   6.125%, 1/01/09, FGIC...................................................................    14,061,060
AAA     5,000   7.00%, 1/01/08, CAPMAC..................................................................     5,599,400
AAA    14,675   7.25%, 1/01/07, CAPMAC..................................................................    16,775,433
                                                                                                         -------------
                                                                                                            37,491,063
                                                                                                         -------------
             NORTH DAKOTA--1.2%
AAA     4,450 Bismark, Hosp. Rev., St. Alexius Med. Ctr., 6.90%, 5/01/06, AMBAC.........................     4,849,877
                                                                                                         -------------
</TABLE>
 
                       See Notes to Financial Statements.
                                       6
<PAGE>
<TABLE>

       PRINCIPAL
        AMOUNT                                                                                             VALUE
RATING*  (000)                                        DESCRIPTION                                        (NOTE 1)
--------------------------------------------------------------------------------------------------------------------
<S>  <C>     <C>                                                                                       <C>
             OHIO--2.4%
AAA  $  2,410 Cleveland, G.O., 6.40%, 11/15/08, MBIA.................................................... $   2,591,449
AAA     6,095 Hamilton City, Elec. Sys. Rev., Ser. A, 6.125%, 10/15/08, FGIC............................     6,373,115
AAA     1,000 Ohio St. Bldg. Auth., Facs. Rev., Juvenille Correctional Proj., 6.50%, 10/01/09, AMBAC....     1,075,140
                                                                                                         -------------
                                                                                                            10,039,704
                                                                                                         -------------

             PENNSYLVANIA--14.0%
AAA     4,000 Allegheny Cnty. Hosp. Dev. Auth. Rev., Magee Women's Hosp., 6.25%, 10/01/08, FGIC.........     4,182,440
             Dauphin Cnty. Gen. Auth. Hosp. Rev., HAPSCO-Western Pennsylvania Hosp. Proj., MBIA:
AAA    10,000   6.25%, Ser. A, 7/01/08..................................................................    10,454,700
AAA     5,000   6.25%, 7/01/08..........................................................................     5,198,650
AAA     6,600 Erie Cnty., Hosp. Auth. Rev., St. Vincent Hlth. Ctr. Proj., Ser. A, 6.25%, 7/01/08,       
                MBIA....................................................................................     6,900,102
AAA     3,500 Indiana Cnty. Indl. Dev. Auth., New York St. Elec. & Gas Corp., Ser. A, 6.00%, 6/01/06,   
                MBIA....................................................................................     3,677,240
AAA     6,500 Pennsylvania Hsg. Fin. Agcy. Rev., Rental Hsg., Ser. C, 6.25%, 7/01/07, FNMA Collateral...     6,767,475
AAA     7,450 Pennsylvania St., G.O., Ser. A, 6.50%, 11/01/07, FGIC.....................................     7,930,749
AAA    10,930 Pittsburgh, G.O., Ser. D, 6.00%, 9/01/08, AMBAC...........................................    11,318,452
AAA     1,665 Scranton-Lackawanna Hlth. & Welfare Auth. Rev., 6.90%, 1/01/09, MBIA......................     1,795,419
                                                                                                         -------------
                                                                                                            58,225,227
                                                                                                         -------------
             TEXAS--23.2%
             Austin, Pub. Impvt., G.O., AMBAC:
AAA     4,000   6.10%, 9/01/07..........................................................................     4,142,640
AAA     4,000   6.10%, 9/01/08..........................................................................     4,116,360
AAA     5,000   6.10%, 9/01/09..........................................................................     5,112,900
             Austin, Util. Sys. Rev.:
AAA    11,515   Ser. A, Zero Coupon, 11/15/08, MBIA.....................................................     5,242,664
AAA     5,000   Ser. A, Zero Coupon, 11/15/09, MBIA.....................................................     2,113,700
AAA     7,000   6.25%, 11/15/08, AMBAC..................................................................     7,385,210
AAA     5,225 Baytown, G.O., 6.40%, 2/01/08, AMBAC......................................................     5,434,836
AAA     9,930 Circle C Mun. Util. Dist. No. 3 Rev., 6.50%, 11/15/09, FGIC...............................    10,419,251
             Coppell Indpt. Sch. Dist., MBIA:
AAA     2,495   6.10%, 8/15/09..........................................................................     2,532,126
AAA     1,430   6.10%, 8/15/09+.........................................................................     1,517,731
AAA    16,135 Houston, Wtr. & Swr. Sys. Rev., Jr. Lien, Ser. C, 6.25%, 12/01/09, MBIA...................    16,786,047
AAA    23,000 San Antonio Elec. & Gas Rev., Ser. B, Zero Coupon, 2/01/09, FGIC..........................    10,193,600
             Texas Mun. Pwr. Agcy. Rev., AMBAC:
AAA    15,000   Zero Coupon, 9/01/08....................................................................     6,912,450
AAA    16,175   Zero Coupon, 9/01/09....................................................................     6,922,576
AAA     5,900 Texas St. Pub. Fin. Auth. Bldg. Rev., Ser. B, 6.25%, 2/01/09, AMBAC.......................     6,261,080
AAA     2,275 Ysleta, Indpt. Sch. Dist. Rev., Zero Coupon, 8/15/08, PSFG................................     1,051,141
                                                                                                         -------------
                                                                                                            96,144,312
                                                                                                         -------------
             UTAH--0.4%
AAA     1,550 Salt Lake Cnty. Mun. Bldg. Auth. Lease Rev., Ser. A, 6.05%, 10/01/08, MBIA................     1,603,677
                                                                                                         -------------
             WASHINGTON--12.6%
AAA     9,000 Seattle Hlth. Care Facs. Auth. Rev., Virginia Mason Oblig. Group, 6.30%, 2/15/09, MBIA....     9,254,070
AAA     4,000 Snohomish Cnty., Sch. Dist., 6.10%, 12/01/08, MBIA........................................     4,156,040
             Washington St. Pub. Pwr. Supply Sys. Rev.:
AAA     5,550   No. 3, Zero Coupon, 7/01/07, MBIA.......................................................     2,736,150
AAA     2,000   No. 3, Zero Coupon, 7/01/08, BIGI.......................................................       916,760
AAA    11,000   5.80%, 7/01/07, FSA.....................................................................    11,113,630
AAA    13,635   No. 2, Ser. A, 6.25%, 7/01/09, MBIA.....................................................    13,955,013
AAA    10,000   No. 2, Ser. A, 5.70%, 7/01/08, MBIA.....................................................     9,963,600
                                                                                                         -------------
                                                                                                            52,095,263
                                                                                                         -------------
</TABLE>
 
                       See Notes to Financial Statements.
                                       7
<PAGE>
<TABLE><CAPTION>

       PRINCIPAL
        AMOUNT                                                                                             VALUE
RATING*  (000)                                        DESCRIPTION                                        (NOTE 1)
--------------------------------------------------------------------------------------------------------------------
<S>  <C>     <C>                                                                                       <C>
             WEST VIRGINIA--2.7%
AAA  $ 11,600 West Virginia St. Parkways Econ. Dev. & Tourism Auth., 3.60%++, 5/15/09, FGIC............. $  11,124,168
                                                                                                         -------------
 
             Total Long-Term Investments (cost $586,191,343)...........................................   615,304,840
                                                                                                         -------------
             SHORT-TERM INVESTMENTS**--0.7%
             CALIFORNIA--0.2%
A1+     1,000 California Hlth. Facs. Fin. Auth. Rev., Sutter Hlth. Proj., Ser. A, 4.15%, 7/03/95,          
                FRDD...................................................................................      1,000,000
                                                                                                         -------------
             CONNECTICUT--0.1%
A1+       300 Connecticut St. Dev. Auth. Poll. Ctrl. Rev., Western Mass. Elec. Co., Ser. A, 4.10%,       
                7/03/95, FRDD..........................................................................        300,000
                                                                                                         -------------
             ILLINOIS--0.1%
A1+       600 Illinois St. Toll Hwy. Auth. Rev., Ser. B, 4.15%, 7/03/95, MBIA, FRDD.....................       600,000
                                                                                                         -------------

             LOUISIANA--0.1%
A1+       300 West Feliciana Parish Poll. Ctrl. Rev., Gulf Sts. Utils. Co., Ser. D, 4.10%, 7/03/95           
               FRDD....................................................................................        300,000
                                                                                                         -------------
             NEW YORK--0.2%
A1+       200 New York City, G.O., Ser. B, 4.50%, 7/03/95, FRDD.........................................       200,000
A1+       400 New York City Mun. Wtr. Fin. Auth. Rev., 4.10%, 7/03/95, FGIC, FRDD.......................       400,000
A1        200 New York City Trust Cultural Res. Rev., FRDD, 4.20%, 7/03/95..............................       200,000
                                                                                                         -------------
                                                                                                               800,000
                                                                                                         -------------
             Total Short-Term Investments (cost $3,000,000)............................................      3,000,000
                                                                                                         -------------
             TOTAL INVESTMENTS--149.2% (cost $589,191,343).............................................    618,304,840
             Other assets in excess of liabilities--0.5%...............................................      2,215,579
             Liquidation value of preferred stock--(49.7)%.............................................   (206,000,000)
                                                                                                         -------------
             NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS--100%........................................  $ 414,520,419
                                                                                                         -------------
                                                                                                         -------------
</TABLE>
 
------------------
 
    * Rating: using the greater of Standard and Poor's, Moody's or Fitch's.
 
   ** For purposes of amortized cost valuation, the maturity date of these
      instruments is considered to be the later 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.
 
    + This bond is prerefunded. See glossary for definition
 
   ++ This bond contains embedded caps. See glossary for definition
 
                                KEY TO ABBREVIATIONS

   AMBAC--American Municipal Bond Assurance Corporation
   BIGI--Bond Investors Guaranty Insurance Company
   CAPMAC--Capital Markets Assurance Corporation
   CGIC--Capital Guaranteed Insurance Company
   C.O.P.--Certificate of Participation
   FGIC--Financial Guaranty Insurance Company
   FNMA--Federal National Mortgage Association
   FRDD--Floating Rate Daily Demand**
   FSA--Financial Security Assurance
   G.O.--General Obligation Bond
   MBIA--Municipal Bond Insurance Association
   PSFG--Permanent School Fund Guaranty
 
                       See Notes to Financial Statements.
                                       8

<PAGE>
----------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1995
(UNAUDITED)
----------------------------------------------

ASSETS
Investments, at value (cost
 $589,191,343) (Note 1)...........   $618,304,840
Cash..............................          9,949
Interest receivable...............     10,520,547
Receivable for investments sold...         95,000
Deferred organization expenses and
 other assets.....................         76,549
                                     ------------
                                      629,006,885
                                     ------------
LIABILITIES
Payable for investments
purchased.........................      7,581,585
Dividends payable--common stock...        338,297
Advisory fee payable (Note 2).....        181,364
Dividends payable--preferred
stock.............................         92,133
Administration fee payable (Note
2)................................         49,346
Other accrued expenses............        243,741
                                     ------------
                                        8,486,466
                                     ------------
NET INVESTMENT ASSETS.............   $620,520,419
                                     ------------
                                     ------------
Net investment assets were
 comprised of:
 Common Stock:
   Par value (Note 4).............   $    272,071
   Paid-in capital in excess of
par...............................    378,448,786
 Preferred stock (Note 4).........    206,000,000
                                     ------------
                                      584,720,857
Undistributed net investment
income............................      4,711,905
Accumulated net realized gain.....      1,974,160
Net unrealized appreciation.......     29,113,497
                                     ------------
Net investment assets, June 30,
1995..............................   $620,520,419
                                     ------------
                                     ------------
Net assets applicable to common
shareholders......................   $414,520,419
                                     ------------
                                     ------------
Net asset value per common share:
 ($414,520,419 / 27,207,093 shares
 of common stock issued and
outstanding)......................         $15.24

----------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED JUNE 30, 1995
(UNAUDITED)
----------------------------------------------

NET INVESTMENT INCOME
 
Income
 
 Interest and discount earned.....   $ 17,782,647
                                     ------------
 
Expenses
 
 Investment advisory..............      1,068,003
 Administration...................        305,144
 Auction agent....................        253,000
 Reports to shareholders..........         45,000
 Custodian........................         44,000
 Directors........................         43,000
 Transfer agent...................         38,000
 Audit............................         11,000
 Legal............................          5,000
 Miscellaneous....................        156,188
                                     ------------
 Total expenses...................      1,968,335
                                     ------------
Net investment income.............     15,814,312
                                     ------------
 
REALIZED AND UNREALIZED GAIN ON
INVESTMENTS (NOTE 3)
 
Net realized gain on
investments.......................      2,788,989
 
Net change in unrealized
 appreciation on investments......     34,116,768
                                     ------------
 
Net gain on investments...........     36,905,757
                                     ------------
 
NET INCREASE IN NET INVESTMENT
ASSETS RESULTING FROM
OPERATIONS........................   $ 52,720,069
                                     ------------
                                     ------------
 
                       See Notes to Financial Statements.
 
                                       9
<PAGE>
--------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS
(UNAUDITED)
--------------------------------------------------------------------------------
<TABLE><CAPTION>
                                                                            SIX MONTHS
                                                                              ENDED         YEAR ENDED
                                                                             JUNE 30,      DECEMBER 31,
                                                                               1995            1994
                                                                           ------------    ------------
<S>                                                                        <C>             <C>
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
 
Operations:
 Net investment income..................................................   $ 15,814,312    $ 31,224,952
 Net realized gain (loss) on investments................................      2,788,989        (781,029)
 Net change unrealized appreciation (depreciation) on investments.......     34,116,768     (64,026,939)
                                                                           ------------    ------------
 Net increase (decrease) in net investment assets resulting from
operations..............................................................     52,720,069     (33,583,016)
 
Dividends and Distributions:
 To common shareholders from net investment income......................    (11,835,014)    (24,078,223)
 To preferred shareholders from net investment income...................     (4,043,333)     (6,203,408)
                                                                           ------------    ------------
   Total increase (decrease)............................................     36,841,722     (63,864,647)
 
NET INVESTMENT ASSETS
Beginning of period.....................................................    583,678,697     647,543,344
                                                                           ------------    ------------
End of period...........................................................   $620,520,419    $583,678,697
                                                                           ------------    ------------
                                                                           ------------    ------------
</TABLE>
 
                       See Notes to Financial Statements.
 
                                       10
<PAGE>
--------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
FINANCIAL HIGHLIGHTS
(UNAUDITED)
--------------------------------------------------------------------------------
 
<TABLE><CAPTION>
                                                                                                           SEPTEMBER 28,
                                                      SIX MONTHS                                               1992*
                                                        ENDED            YEAR ENDED DECEMBER 31,              THROUGH
                                                       JUNE 30,      -------------------------------       DECEMBER 31,
                                                         1995            1994               1993               1992
                                                      ----------     ------------       ------------       -------------
<S>                                                   <C>            <C>                <C>                <C>
PER COMMON SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..............     $  13.88        $  16.23           $  14.31           $   14.10
                                                      ----------     ------------       ------------       -------------
 Net investment income............................         0.58            1.15               1.14                0.17
 Net realized and unrealized gain (loss) on
investments.......................................         1.36           (2.39)              1.91                0.31
                                                      ----------     ------------       ------------       -------------
Net increase (decrease) from investment
operations........................................         1.94           (1.24)              3.05                0.48
                                                      ----------     ------------       ------------       -------------
Dividends from net investment income to:
 Preferred shareholders...........................        (0.15)          (0.23)             (0.20)              (0.02)
 Common shareholders..............................        (0.43)          (0.88)             (0.88)              (0.07)
Distributions from capital gains to:
 Preferred shareholders...........................       --              --                  (0.01)            --
 Common shareholders..............................       --              --                  (0.04)            --
                                                      ----------     ------------       ------------       -------------
Total dividends and distributions.................        (0.58)          (1.11)             (1.13)              (0.09)
                                                      ----------     ------------       ------------       -------------
Capital charge with respect to issuance of
shares............................................       --              --                 --                   (0.18)
                                                      ----------     ------------       ------------       -------------
Net asset value, end of period**..................     $  15.24        $  13.88           $  16.23           $   14.31#
                                                      ----------     ------------       ------------       -------------
                                                      ----------     ------------       ------------       -------------
Market value, end of period**.....................     $  13.75        $  12.25           $ 15.125           $   13.75
                                                      ----------     ------------       ------------       -------------
                                                      ----------     ------------       ------------       -------------
TOTAL INVESTMENT RETURN+..........................        15.79%         (13.71)%            16.05%              (1.99)%
                                                      ----------     ------------       ------------       -------------
                                                      ----------     ------------       ------------       -------------
 
RATIOS TO AVERAGE NET ASSETS OF COMMON
 SHAREHOLDERS:+++
Expenses..........................................         0.97%++         1.02%              0.88%               0.73%++
Net investment income.............................         7.83%++         7.80%              7.43%               4.91%++
 
SUPPLEMENTAL DATA:
Average net assets of common shareholders (in
thousands)........................................     $407,494        $400,555           $420,532           $ 372,256
Portfolio turnover................................           25%             64%                15%                  2%
Net assets of common shareholders, end of period
(in thousands)....................................     $414,520        $377,679           $441,543           $ 389,333
Preferred stock outstanding (in thousands)........     $206,000        $206,000           $206,000           $ 206,000
Asset coverage per share of preferred stock, end
of period.........................................     $150,612        $141,670           $157,171           $ 144,500
</TABLE>
 
------------
 * Commencement of investment operations.
 ** Net asset value and market value are published in The Wall Street Journal
    each Monday.
 # Net asset value immediately after the closing of the first public offering
   was $14.07.
 + 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. 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 return for periods of
   less than a year are not annualized.
 ++ Annualized.
+++ Ratios 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. Ratios do not reflect the effect of dividend payments to
    preferred shareholders.
 
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 Trust's shares.
 
                       See Notes to Financial Statements.
 
                                       11
<PAGE>
----------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
NOTES TO FINANCIAL STATEMENTS
(UNAUDITED)
----------------------------------------------
 
Note 1. Accounting           The BlackRock Insured
Policies                     Municipal 2008 Term
                             Trust Inc. (the
                             "Trust") was organized
                             in
Maryland on August 7, 1992 as a diversified, closed-end management investment
company. The Trust's investment objective is to manage a diversified portfolio
of high quality securities that will return $15 per share to investors on or
about December 31, 2008 while providing current income exempt from regular
Federal income tax. The ability of issuers of debt securities held by the Trust
to meet their obligations may be affected by economic developments in the
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 a pricing service which uses information with respect to
transactions in bonds, quotations from bond dealers, market transactions in
comparable securities and various relationships between securities in
determining values. 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.
 
   Short-term securities which mature in more than 60 days are valued at current
market quotations. Short-term securities which mature in 60 days or less are
valued at amortized cost, if their term to maturity from date of purchase is 60
days or less, or by amortizing their value on the 61st day prior to maturity, if
their original term to maturity from date of purchase exceeded 60 days.
 
OPTION SELLING/PURCHASING: When the Trust sells or purchases an option, an
amount equal to the premium received or paid by the Trust is recorded as a
liability or an asset and is subsequently adjusted to the current market value
of the option written or purchased. Premiums received or paid from writing or
purchasing options which expire unexercised are treated by the Trust on the
expiration date as realized gains or losses. The difference between the premium
and the amount paid or received on effecting a closing purchase or sale
transaction, including brokerage commissions, is also treated as a realized gain
or loss. If an option is exercised, the premium paid or received is added to the
proceeds from the sale or cost of the purchase in determining whether the Trust
has realized a gain or a loss on investment transactions. The Trust, as writer
of an option, may have no control over whether the underlying securities may be
sold (call) or purchased (put) and as a result bears the market risk of an
unfavorable change in the price of the security underlying the written option.
 
FINANCIAL FUTURES CONTRACTS: A futures contract is an agreement between two
parties to buy and sell a financial instrument for a set price on a future date.
Initial margin deposits are made upon entering into futures contracts and can be
either cash or securities. During the period the futures contract is open,
changes in the value of the contract are recognized as unrealized gains or
losses by "marking-to-market" on a daily basis to reflect the market value of
the contract at the end of each day's trading. Variation margin payments are
made or received, depending upon whether unrealized gains or losses are
incurred. When the contract is closed, the Trust records a realized gain or loss
equal to the difference between proceeds from (or cost of) the closing
transaction and the Trust's basis in the contract.
 
   The Trust may invest in financial futures contracts primarily for the purpose
of hedging its existing portfolio securities or securities the Trust intends to
purchase against fluctuations in value caused by changes in prevailing market
interest rates. Should interest rates move unexpectedly, the Trust may not
achieve the anticipated benefits of the financial futures contracts and may
realize a loss. The use of futures transactions involves the risk of imperfect
correlation in movements in the price of futures contracts, interest rates and
the underlying hedged assets.
 
SHORT SALES: The Trust may make short sales of securities as a method of hedging
potential price declines in similar securities owned. When the Trust makes a
short sale, it may borrow the securities sold short and deliver it to the
broker-dealer through which it made the short sale as collateral for its
obligation to deliver the security upon conclusion of the sale. The Trust may
have to pay a fee to borrow the particular securities and may be obligated to
pay over any payments received on such borrowed securities. A gain, limited to
the price at which the Trust sold the security short, or a loss, unlimited as to
dollar amount, will be recognized upon the termination of a short sale if the
market price is greater or less than the proceeds originally received.
 
SECURITIES TRANSACTIONS AND INVESTMENT INCOME: Securities transactions are
recorded on the 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 amortizes premium or accretes discount 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. Therefore, no
Federal income tax provision is required.
 
DIVIDENDS AND DISTRIBUTIONS: The Trust declares and pays dividends and
distributions to common shareholders monthly from
 
                                       12
<PAGE>
net investment income and other sources, if necessary. Net 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.
 
DEFERRED ORGANIZATION EXPENSES: A total of $60,000 was incurred in connection
with the organization of the Trust. These costs have been deferred and are being
amortized ratably over a period of sixty months from the date the Trust
commenced investment operations.
 
Note 2. Agreements               The Trust has an
                                 Investment Advisory
                                 Agreement with
                                 BlackRock Financial
Management, Inc. (the "Adviser") and an Administration Agreement with Middlesex
Administrators L.P. (the "Administrator"), an indirect wholly owned subsidiary
of Merrill Lynch & Co., Inc.
 
   The investment advisory fee paid to the Adviser 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 0.10% of the Trust's
average weekly net investment assets.
 
   Pursuant to the agreements, the Adviser provides continuous supervision of
the investment portfolio and pays the compensation of officers of the Trust who
are affiliated persons of the Adviser. The Administrator pays occupancy and
certain clerical and accounting costs of the Trust. The Trust bears all other
costs and expenses.
 
   On February 28, 1995, the Adviser was acquired by PNC Bank, N.A. Following
acquisition, the Adviser has become a wholly-owned corporate subsidiary of PNC
Asset Management Group, Inc., the holding company for PNC's asset management
businesses.
 
Note 3. Portfolio                Purchases and sales of
Securities                       investment securities,
                                 other than short- term
                                 investments, for the
six months ended June 30, 1995, aggregated $154,756,132 and $149,792,184
respectively.
 
   The Federal income tax basis of the Trust's investments at June 30, 1995 was
substantially the same as the basis for financial reporting, and accordingly,
net unrealized appreciation was $29,113,497 (gross unrealized
appreciation--$29,703,021; gross unrealized depreciation--$589,524).
 
   For Federal income tax purposes, the Trust had a capital loss carryforward at
December 31, 1994 of approximately $228,000 which will expire in 2002.
Accordingly, no capital gain distribution is expected to be paid to shareholders
until net gains have been realized in excess of such amount.
 
   The Trust incurred approximately $545,000 of realized
losses on investments in the post-October period of the year
ended December 31, 1994. A tax election was made to defer all of
these losses to the year ending December 31, 1995.
 
Note 4. Capital                  There are 200 million
                                 shares of $.01 par
                                 value common stock
                                 authorized. Of the
                                 27,207,093
common shares outstanding at June 30, 1995, the Adviser owned 7,093 shares.
 
   The Trust may classify or reclassify any unissued shares of common stock into
one or more series of preferred stock. On November 23, 1992, the Trust
reclassified 4,120 shares of common stock and issued 4 series of Auction Market
Preferred Stock ("Preferred Stock") as follows: Series T28--1,030 shares, Series
R28--1,030 shares, Series R7--1,030 shares and series T7--1,030 shares. The
Preferred Stock has a liquidation value of $50,000 per share plus any
accumulated but unpaid dividends.
 
   Dividends on Series T7 and R7 are cumulative at a rate which is reset every 7
days based on the results of an auction. Dividends on Series T28 are cumulative
at a rate which is reset every 28 days based on the results of an auction.
Series R28 paid dividends monthly at a rate established at the initial offering
through May 17, 1994. Thereafter, rates on Series R28 reset every 28 days based
on results of an auction. Dividend rates ranged from 2.99% to 5.875% for the six
months ended June 30, 1995.
 
   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 $50,000 per share plus any accumulated or
unpaid dividends whether or not declared. The Preferred Stock is also subject to
mandatory redemption at $50,000 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 shares, 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,
 
                                       13
<PAGE>
including, among other things, changes in the Trust's subclassification as a
closed-end investment company or changes in its fundamental investment
restrictions.
 
   On May 16, 1995 shareholders approved a proposal to split each share of the
Trust's Auction Rate Municipal Preferred Stock into two shares and
simultaneously reduce each share's liquidation preference from $50,000 to
$25,000. It is expected that the stock split will occur after the close of
business on July 24, 1995.
 
Note 5. Dividends                Subsequent to June 30,
                                 1995, the Board of
                                 Directors of the Trust
                                 declared a dividend
from undistributed earnings of $0.06625 per common share payable July 31, 1995
to shareholders of record on July 14, 1995.
 
   For the period July 1, 1995 to July 14, 1995 dividends declared on Preferred
Stock totalled $302,149 in aggregate for the four outstanding Preferred Stock
series.
 
Note 6. Quarterly Data
<TABLE><CAPTION>
                                                                                             NET REALIZED AND
                                                                                             UNREALIZED GAINS
                                                        NET INVESTMENT INCOME                   (LOSSES) ON
                                                                                                INVESTMENTS
                                                                           PER                                 PER
                                   TOTAL                                  COMMON                              COMMON
  QUARTERLY PERIOD                 INCOME               AMOUNT            SHARE              AMOUNT           SHARE
<S>                           <C>                  <C>                  <C>            <C>                    <C>
January 1, 1993 to March
31, 1993..................    $      8,508,139     $      7,582,686     $     .28      $       18,517,154     $ .68
April 1, 1993 to June 30,
1993......................           8,778,901            7,813,266           .28              17,865,646       .66
July 1, 1993 to September
30, 1993..................           8,824,076            7,839,092           .29              17,748,670       .65
October 1, 1993 to
December 31, 1993.........           8,834,900            8,009,842           .29              (2,110,705)     (.08)
January 1, 1994 to March
31, 1994..................           8,832,081            7,884,427           .29             (45,751,726)    (1.68)
April 1, 1994 to June 30,
1994......................           8,809,249            7,772,462           .29              (1,212,935)     (.05)
July 1, 1994 to September
30, 1994..................           8,829,898            7,734,106           .28              (4,375,948)     (.16)
October 1, 1994 to
December 31, 1994.........           8,857,899            7,833,957           .29             (13,467,359)     (.50)
January 1, 1995 to March
31, 1995..................           9,022,548            8,038,887           .30              32,598,380      1.19
April 1, 1995 to June 30,
1995......................           8,760,099            7,775,425           .28               4,307,377       .17
 
<CAPTION>
                             NET INCREASE (DECREASE) IN
                                NET INVESTMENT ASSETS
                                                                           DIVIDENDS AND DISTRIBUTIONS
                              RESULTING FROM OPERATIONS                 COMMON SHARES                  PREFERRED
                                                    PER                                PER
                                                   COMMON                             COMMON            SHARES*
  QUARTERLY PERIOD                AMOUNT           SHARE           AMOUNT             SHARE              AMOUNT
<S>                           <C>            <C>               <C>               <C>
January 1, 1993 to March
31, 1993..................  $       26,099,840     $ .96      $      6,019,569     $       .22      $      1,371,214
April 1, 1993 to June 30,
1993......................          25,678,912       .94             6,019,570             .22             1,405,893
July 1, 1993 to September
30, 1993..................          25,587,762       .94             6,019,569             .22             1,421,503
October 1, 1993 to
December 31, 1993.........           5,899,137       .21             7,187,297             .26             1,483,008
January 1, 1994 to March
31, 1994..................         (37,867,299)    (1.39 )           6,019,560             .22             1,335,347
April 1, 1994 to June 30,
1994......................           6,559,527       .24             6,019,553             .22             1,491,464
July 1, 1994 to September
30, 1994..................           3,358,158       .12             6,019,554             .22             1,532,047
October 1, 1994 to
December 31, 1994.........          (5,633,402)     (.21 )           6,019,556             .22             1,844,550
January 1, 1995 to March
31, 1995..................          40,637,267      1.49             6,019,538             .22             2,009,567
April 1, 1995 to June 30,
1995......................          12,082,802       .45             5,815,476             .21             2,033,766
 
<CAPTION>
                                PER                  SHARE PRICE OF                 PERIOD
                               COMMON                 COMMON STOCK                 END NET
  QUARTERLY PERIOD             SHARE             HIGH               LOW          ASSET VALUE
January 1, 1993 to March
31, 1993..................  $       .05      $      15.125     $      14.125     $     15.02
April 1, 1993 to June 30,
1993......................          .05             14.875            14.500           15.67
July 1, 1993 to September
30, 1993..................          .05             15.375            14.750           16.34
October 1, 1993 to
December 31, 1993.........          .06             15.500            14.875           16.23
January 1, 1994 to March
31, 1994..................          .05             15.375            13.875           14.57
April 1, 1994 to June 30,
1994......................          .05             14.875            13.625           14.53
July 1, 1994 to September
30, 1994..................          .06             14.625            13.375           14.38
October 1, 1994 to
December 31, 1994.........          .07             13.625            11.500           13.88
January 1, 1995 to March
31, 1995..................          .07             14.125            12.250           15.08
April 1, 1995 to June 30,
1995......................          .08             14.500            13.375           15.24
</TABLE>
 
--------------
* For the six months ended June 30, 1995 the average annualized rate paid to
  preferred shareholders was 3.96%.
 
                                       14
<PAGE>
--------------------------------------------------------------------------------
 
                           DIVIDEND REINVESTMENT PLAN
--------------------------------------------------------------------------------
 
   Pursuant to the Trust's Dividend Reinvestment Plan (the "Plan"), shareholders
may elect to have all distributions of dividends and capital gains automatically
reinvested by State Street Bank & Trust Company (the "Plan Agent") in Trust
shares. Shareholders who do not 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 custodian, 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 for the participants' accounts. The Trust will not issue 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 will be made 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.
 
   Experience under the Plan may indicate that changes are desirable.
Accordingly, 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 addresses are on the front of
this report.
 
                                       15
<PAGE>
--------------------------------------------------------------------------------
 
                             ADDITIONAL INFORMATION
--------------------------------------------------------------------------------
 
   There have been no material changes in the Trust's investment objectives or
policies that have not been approved by the shareholders. There have been no
changes in the Trust's charter or by-laws. There have been no changes 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.
 
   At a special meeting of Trust shareholders held on February 15, 1995 to
approve the Trusts' advisory agreement with BlackRock Financial Management,
Inc., shareholders approved the agreement. The result of the voting was as
follows:
 
          VOTES* FOR 19,469,024          VOTES* AGAINST 327,914          VOTES*
WITHHELD 675,859
 
   The Annual Meeting of Trust shareholders was held May 16, 1995 to vote on the
following matters:
 
   (1) To elect two Directors to serve as follows:
 
<TABLE><CAPTION>
DIRECTOR                                                       CLASS     TERM      EXPIRING
------------------------------------------------------------   -----    -------    --------
<S>                                                            <C>      <C>        <C>
Ralph L. Schlosstein........................................     II     3 years      1998
Kent Dixon..................................................    III      1 year      1996
</TABLE>
 
      and to elect two Directors to represent the interests of the preferred
shareholders as follows:
 
<TABLE><CAPTION>
DIRECTOR                                                       CLASS     TERM      EXPIRING
------------------------------------------------------------   -----    -------    --------
<S>                                                            <C>      <C>        <C>
Frank J. Fabozzi............................................     II     3 years      1998
Richard E. Cavanagh.........................................      I     2 years      1997
</TABLE>
 
    Directors whose term of office continues beyond this meeting are Andrew F.
     Brimmer, James Grosfeld, James Clayburn
     La Force, Jr. and Laurence D. Fink.
 
   (2) To consider and act on a proposal to split each share of the Trust's
       Auction Rate Preferred Stock (Preferred) into two shares and
       simultaneously reduce each share's liquidation preference, as provided in
       the Trust's Articles Supplementary, from $50,000 to $25,000.
 
   (3) To ratify the selection of Deloitte & Touche LLP as independent public
       accountants for the Trust for the fiscal year ending December 31, 1995.
 
   Shareholders elected the four Directors, approved the proposal to split each
Preferred share into two shares and ratified the selection of Deloitte & Touche
LLP. The results of the voting was as follows:
 
<TABLE><CAPTION>
                                                            VOTES* FOR    VOTES* AGAINST    VOTES* WITHHELD
                                                            ----------    --------------    ---------------
<S>                                                         <C>           <C>               <C>
Ralph L. Schlosstein.....................................   18,037,454             --           286,945
Kent Dixon...............................................   18,015,820             --           308,579
Frank J. Fabozzi.........................................       2,010              --               149
Richard E. Cavanagh......................................       2,010              --               149
 
Preferred Share Split....................................       2,117              31                11
 
Deloitte & Touche LLP....................................   17,953,711        122,659           248,029
</TABLE>
 
------------
* The votes represent common and preferred shareholders voting as a single class
  except for the election of Richard E. Cavanagh and Frank J. Fabozzi, and the
  approval of the preferred share split which represents the votes of only the
  preferred shareholders.
 
                                       16
<PAGE>
--------------------------------------------------------------------------------
                THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST
                               INVESTMENT SUMMARY
--------------------------------------------------------------------------------
 
THE TRUST'S INVESTMENT OBJECTIVE
 
   The Trust's investment objective is to provide current income exempt from
regular Federal income tax and to return $15 per share (the initial public
offering price per share) to investors on or about December 31, 2008.
 
WHO MANAGES THE TRUST?
 
   BlackRock Financial Management, Inc. (BlackRock or the Adviser) is the
investment adviser for the Trust. BlackRock is a registered investment adviser
specializing in fixed income securities. Currently, BlackRock manages over $32
billion of assets across the government, mortgage, corporate and municipal
sectors. These assets are managed on behalf of institutional and individual
investors in 21 closed-end funds, several open-end funds and separate accounts
for more than 80 clients in the U.S. and overseas. BlackRock is a subsidiary of
PNC Asset Management Group, Inc. which is a division of PNC Bank, N.A., the
nation's twelfth largest banking organization.
 
WHAT CAN THE TRUST INVEST IN?
 
   The Trust intends to invest at least 80% of its total assets in a diversified
portfolio of municipal obligations insured as to the timely payment of both
principal and interest. The Trust may invest up to 20% of its total assets in
uninsured municipal obligations which are rated Aaa by Moody's or AAA by S&P, or
are determined by the Trust's Adviser to be of comparable credit quality
(guaranteed, escrowed or backed in trust).
 
WHAT IS THE ADVISER'S INVESTMENT STRATEGY?
 
   The Adviser will seek to meet the Trust's investment objective by managing
the assets of the Trust so as to return the initial offering price ($15 per
share) at maturity. The Trust will implement a conservative strategy that will
seek to closely match the maturity of the assets of the portfolio with the
future return of the initial investment at the end of 2008. At the Trust's
termination, BlackRock expects that the value of the securities which have
matured, combined with the value of the securities that are sold and the value
of securities that are purchased, if any, will be sufficient to return the
initial offering price to investors. On a continuous basis, the Trust will seek
its objective by actively managing its portfolio of municipal obligations which
will have an average final maturity on or about December 31, 2008 and by
annually retaining a small portion of its income.
 
   In addition to seeking the return of the initial offering price, the Adviser
also seeks to provide current income exempt from regular Federal income tax to
investors. The portfolio managers will attempt to achieve this objective by
investing in securities that provide competitive income. In addition, leverage
will be used (in an amount up to 35% of the portfolio assets) to enhance the
income of the portfolio. In order to maintain competitive yields as the Trust
approaches maturity and depending on market conditions, the Adviser will attempt
to purchase securities with call protection or maturities as close to the
Trust's maturity date as possible. Securities with call protection should
provide the portfolio with some degree of protection against reinvestment risk
during times of lower prevailing interest rates. Since the Trust's primary goal
is to return the initial offering price at maturity, any cash that the Trust
receives prior to its maturity date will be reinvested in securities with
maturities which coincide with the remaining term of the Trust. It is important
to note that the Trust will be managed so as to preserve the integrity of the
return of the initial offering price. If market conditions, such as high
interest rate volatility, force a choice between current income and risking the
return of the initial offering price, it is likely that the return of the
initial offering price will be emphasized.
 
                                       17
<PAGE>
HOW ARE THE TRUST'S SHARES PURCHASED AND SOLD? DOES THE TRUST PAY DIVIDENDS
REGULARLY?
 
   The Trust's 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 last business day of the
month. For shares held in the shareholder's name, dividends may be reinvested in
additional shares of the fund through the Trust's transfer agent, Boston
Financial Data Services. 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 A TERM TRUST
 
   Under current market conditions, leverage increases the income earned by the
Trust. The Trust employs leverage primarily through the issuance of preferred
stock. Leverage permits the Trust to borrow money at short-term rates and
reinvest that money in longer-term assets which typically offer higher interest
rates. The difference between the cost of the borrowed funds and the income
earned on the proceeds that are invested in longer term assets is the benefit to
the Trust from leverage. In general, the portfolio is typically leveraged at
approximately 35% of total assets.
 
   Leverage also increases the duration (or price volatility of the net assets)
of the Trust, which can improve the performance of the fund in a declining rate
environment, but can cause net assets to decline faster than the market in a
rapidly rising rate environment. BlackRock's portfolio managers continuously
monitor and regularly review the Trust's use of leverage and the Trust may
reduce, or unwind, the amount of leverage employed should BlackRock consider
that reduction to be in the best interests of the shareholders.
 
SPECIAL CONSIDERATIONS AND RISK FACTORS RELEVANT TO TERM TRUSTS
 
___The Trust is intended to be a long-term investment and is not a short-term
trading vehicle.
 
   RETURN OF INITIAL INVESTMENT. Although the objective of the Trust is to
return its initial offering price upon termination, there can be no assurance
that this objective will be achieved.
 
   DIVIDEND CONSIDERATIONS. The income and dividends paid by the Trust are
likely to decline to some extent over the term of the Trust due to the
anticipated shortening of the dollar-weighted average maturity of the Trust's
assets.
 
   LEVERAGE. The Trust utilizes leverage through the issuance of preferred
stock, which involves special risks. The Trust's net asset value and market
value may be 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: BRM) 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.
 
   ILLIQUID SECURITIES. The Trust may invest in securities that are illiquid,
although under current market conditions the Trust expects only to do so to a
limited extent. An investment in these securities involves 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.
 
   MUNICIPAL OBLIGATIONS. Municipal obligations include debt obligations issued
by states, cities, and local authorities, and possessions and certain
territories of the United States to obtain funds for various public purposes,
including the construction of public facilities, the refinancing of outstanding
obligations and the obtaining of funds for general operating expenses and for
loans to other public institutions and facilities. 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.
 
   ALTERNATIVE MINIMUM TAX (AMT). The Trust may invest in securities subject to
AMT. The Trust currently holds no securities that are subject to AMT.
 
                                       18
<PAGE>
--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                                    GLOSSARY
--------------------------------------------------------------------------------
 
<TABLE>
<S>                        <C>
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.
 
EMBEDDED CAP BONDS:        Also known as additional interest municipal bonds. These securities are intended to
                           protect the income that a fund earns through leverage from significant increases in
                           short-term rates. The coupon on these bonds will increase if short term rates rise
                           significantly.
 
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 shares. It is the
                           underlying value of a single share on a given day. Net asset value for the Trust is
                           calculated weekly and published in Barron's on Saturday and The New York Times or
                           The Wall Street Journal each 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.
</TABLE>
 
                     IF YOU WOULD LIKE FURTHER INFORMATION
                    PLEASE CALL BLACKROCK AT (800) 227-7BFM
                    OR CONSULT WITH YOUR FINANCIAL ADVISOR.
 
                                       19
<PAGE>
DIRECTORS
Laurence D. Fink, Chairman
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Grosfeld
James Clayburn La Force, Jr.
                                                 THE [BLACKROCK "LOGO"]
Ralph L. Schlosstein
OFFICERS
                                                 INSURED MUNICIPAL
Ralph L. Schlosstein, President
Keith T. Anderson, Vice President
Michael C. Huebsch, Vice President
                                                 2008 TERM TRUST INC.
Robert S. Kapito, Vice President
Kevin Klingert, Vice President
                                  ----------------------------------------------
Richard M. Shea, Vice President/Tax
Henry Gabbay, Treasurer
                                                 SEMI-ANNUAL REPORT
James Kong, Assistant Treasurer
Karen H. Sabath, Secretary
                                                 JUNE 30, 1995
INVESTMENT ADVISER
BlackRock Financial Management, Inc.
345 Park Avenue
New York, NY 10154
(800) 227-7BFM

ADMINISTRATOR
Middlesex Administrators L.P.
800 Scudders Mill Road
Plainsboro, NJ 08536
(800) 688-0928

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

AUCTION AGENT
Bankers Trust Company
4 Albany Street
New York, NY 10006

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

LEGAL COUNSEL
Skadden, Arps, Slate, Meagher & Flom
919 Third Avenue
New York, NY 10022
 
   The accompanying financial statements as of June 30, 1995 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 INSURED
                         MUNICIPAL 2008 TERM TRUST INC.
                       c/o Middlesex Administrators L.P.
                             800 Scudders Mill Road
                              Plainsboro, NJ 08536
                                 (800) 227-7BFM
 
                              09247K 10 9
                              09247K 30 7
                              09247K 20 8
                              09247K 40 6
                              09247K 50 5


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