BLK SUBSIDIARY INC
N-30D, 2000-03-01
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- --------------------------------------------------------------------------------
BLK SUBSIDIARY, INC.
PORTFOLIO OF INVESTMENTS
DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
        PRINCIPAL
         AMOUNT                                                   VALUE
RATING*  (000)                     DESCRIPTION                   (NOTE 1)
- --------------------------------------------------------------------------------

                 LONG-TERM INVESTMENTS--130.0%
                 MORTGAGE PASS-THROUGHS--17.7%
      $ 21,967   Federal Home Loan Mortgage Corp.,
                   6.50%, 4/01/28 - 7/01/29 ...............      $   20,710,608
                                                                 --------------
           326   Federal Housing Administration,
                   Ponds at Punaluu,
                   7.625%, 4/01/37 ........................             325,841
                 Federal National Mortgage
                   Association,
       147,662@    6.50%, 6/01/23 - 6/01/29 ...............         139,007,648
        20,563@    7.00%, 2/01/24 - 9/01/29 ...............          19,922,269
                                                                 --------------
                                                                    179,966,366
                                                                 --------------
                 AGENCY MULTIPLE CLASS MORTGAGE
                 PASS-THROUGHS--2.6%
                 Federal Home Loan Mortgage Corp.,
                   Multiclass Mortgage
                   Participation Certificates,
         2,139     Series 1454, Class 1454-FB,
                     4/15/20 ..............................           2,041,138
            93     Series 1563, Class 1563-S,
                     10/15/07 .............................              87,425
            95     Series 1663, Class 1663-A,
                     7/15/23 ..............................              92,122
           389     Series 1686, Class 1686-PK,
                     4/15/23 ..............................             384,376
                 Federal National Mortgage Association,
                   REMIC Pass-Through Certificates,
        10,061     Trust 1992-43, Class 43-E,
                     4/25/22 ..............................          10,004,833
         6,375     Trust 1994-81, Class 81-PE,
                     6/25/18 ..............................           6,368,843
         6,162     Trust 1996-T6, Class T6-C,
                     2/26/01 ..............................           6,093,662
         1,541     Trust 1996-T6, Class T6-D,
                     2/26/01 ..............................           1,518,856
                                                                 --------------
                                                                     26,591,255
                                                                 --------------
                 NON-AGENCY MULTIPLE CLASS
                 MORTGAGE PASS-THROUGHS--0.0%
AA         190   Collateralized Mortgage
                   Securities Corp.,
                   Series F, Class F4-A, 11/01/15 .........             194,558
                                                                 --------------

                 ADJUSTABLE & INVERSE FLOATING
                 RATE MORTGAGES--1.6%
                 Federal Home Loan Mortgage Corp.,
                   Multiclass Mortgage Participation
                   Certificates,
           356     Series 1563, Class 1563-SB,
                     8/15/08 ..............................             347,922
           603     Series 1592, Class 1592-NE,
                     12/15/22 .............................             554,732
         1,066     Series 1606, Class 1606-SB,
                     11/15/08 .............................           1,036,684
         2,229     Series 1671, Class 1671-KB,
                     2/15/24 ..............................           2,181,561
                 Federal National Mortgage Association,
                   REMIC Pass-Through Certificates,
         3,717     Trust 1992-155, Class 155-SA,
                     10/25/05 .............................           3,759,285
           230     Trust 1993-117, Class 117-S,
                     7/25/08 ..............................             220,624
         1,719     Trust 1993-178, Class 178-SC,
                     9/25/23 ..............................           1,643,465
         2,247     Trust 1993-196, Class 196-SM,
                     10/25/08 .............................           1,938,944
         1,544     Trust 1993-214, Class 214-SO,
                     12/25/08 .............................           1,494,963
         1,500     Trust 1993-G17, Class G17-SH,
                     4/25/23 ..............................             911,250
         2,406     Trust 1998-38, Class 38-S,
                     1/18/12 ..............................           2,416,713
                                                                 --------------
                                                                     16,506,143
                                                                 --------------
                 INTEREST ONLY MORTGAGE-BACKED
                 SECURITIES--3.2%
AAA    123,720   Credit Suisse First Boston Mortgage
                     Securities Corp., Series 1997-C1,
                     Class AX, 6/20/29** ..................          10,198,406
                 Federal Home Loan Mortgage Corp.,
                   Multiclass Mortgage
                   Participation Certificates,
         5,257     Series G3, Class G3-S,
                     4/25/19 ..............................             133,637
         5,725     Series G32, Class G32-PT,
                     2/25/19 ..............................             282,627
            30     Series 113, Class 113-N,
                     5/15/21 ..............................             897,006
             3     Series 1378, Class 1378-DA,
                     1/15/18 ..............................               3,080
            13     Series 1388, Class 1388-G,
                     5/15/06 ..............................             145,152
             7     Series 1404, Class 1404-E,
                     1/15/06 ..............................              54,605
         1,647     Series 1617, Class 1617-EB,
                     9/15/23 ..............................           1,618,873
         8,289     Series 1621, Class 1621-SJ,
                     10/15/20 .............................             169,753
                 Federal National Mortgage Association,
                   REMIC Pass-Through Certificates,
             4     Trust 1991-29, Class 29-J,
                     4/25/21 ..............................             134,372
            12     Trust 1991-80, Class 80-Q,
                     7/25/21 ..............................             329,783

See Notes to Financial Statements.

                                       1
<PAGE>

- --------------------------------------------------------------------------------
        PRINCIPAL
         AMOUNT                                                   VALUE
RATING*  (000)                     DESCRIPTION                   (NOTE 1)
- --------------------------------------------------------------------------------

                 INTEREST ONLY MORTGAGE-BACKED
                 SECURITIES(CONTINUED)
      $  3,253     Trust 1993-141, Class 141-PW,
                     6/25/18 ..............................      $      148,217
        12,720     Trust 1998-3, Class 3-SC,
                     2/18/28 ..............................             178,879
                 Merrill Lynch Mortgage Investors, Inc.,
AAA     66,932     Series 1997-C2, Class IO,
                     12/10/29 .............................           4,345,512
AAA     47,653     Series 1998-C2, Class IO,
                     2/15/30 ..............................           3,411,739
AAA         26   Merrill Lynch Trust,
                     Series 43, Class 43-F, 8/27/15 .......             121,136
                 Morgan Stanley Capital Inc.,
AAA    112,525     Series 1998-HF1, Class HF1-X,
                     2/15/18 ..............................           6,046,776
AAA     98,995     Series 1998-WF2, Class WF2-X,
                     4/15/23 ..............................           3,870,200
                                                                 --------------
                                                                     32,089,753
                                                                 --------------
                 PRINCIPAL ONLY MORTGAGE-BACKED
                 SECURITIES--1.8%
                 Federal Home Loan Mortgage Corp.,
                   Multiclass Mortgage
                   Participation Certificates,
           383     Series 1338, Class 1338-Q,
                     8/15/07 ..............................             323,903
         4,714     Series 1662, Class 1662-PO,
                     1/15/09 ..............................           3,739,054
                 Federal National Mortgage Association,
                   REMIC Pass-Through Certificates,
         1,602     Trust 5, Class 1, 9/01/07 ..............           1,334,710
           637     Trust 60, Class 1, 1/01/19 .............             506,341
           179     Trust 1991-G44, Class G44-H,
                     11/25/21 .............................             174,402
         9,734     Trust 1993-257, Class 257-A,
                     6/25/23 ..............................           9,246,274
         3,453     Trust 1994-54, Class 54-B,
                     11/25/23 .............................           3,304,283
                                                                 --------------
                                                                     18,628,967
                                                                 --------------
                 COMMERCIAL MORTGAGE-BACKED
                 SECURITIES--3.6%
BBB      4,148   CBA Mortgage Corp.,
                   Series 1993-C1, Class D,
                   6.67%, 12/25/03 ........................           4,010,950
AAA      3,526   Mortgage Capital Funding, Inc.,
                   Series 1998-MC3, Class A1,
                   6.001%, 11/18/31 .......................           3,330,923
AAA      5,200   PaineWebber Mortgage Acceptance
                   Corp. IV, Series 1995-M1, Class A,
                   6.70%, 1/15/07** .......................           5,102,500
                 Resolution Trust Corp.,
AA       6,230     Series 1994-C1, Class C,
                   8.00%, 6/25/26 .........................           6,221,812
A        5,435     Series 1994-C2, Class D,
                   8.00%, 4/25/25 .........................           5,343,357
AAA     12,800   Structured Asset Securities Corp.,
                   Series 1996-CFL, Class B,
                   6.303%, 2/25/28 ........................          12,736,000
                                                                 --------------
                                                                     36,745,542
                                                                 --------------
                 ASSET-BACKED SECURITIES--14.0%
BBB      2,183   Amresco Securitized Interest,
                   Series 1996-1, Class A,
                   8.10%, 4/26/26** .......................           1,570,978
Aaa     21,096   Brazos Student Loan Financial Corp.,
                   Series 1998-A, Class A1,
                   6.46%, 6/01/06 .........................          21,026,919
                 Broad Index Secured Trust Offering,
Baa2    10,000     6.58%, 3/26/01 .........................           9,784,131
Baa2    10,000     7.149%, 9/09/01** ......................           9,981,250
AA       6,000   Chase Credit Card Master Trust,
                   Series 1997-2, Class A,
                   6.30%, 4/15/03 .........................           5,992,500
AA       5,723   Chase Manhattan Grantor Trust,
                   Series 1996-B, Class A,
                   6.61%, 9/15/02 .........................           5,717,646
AA      35,000@  Citibank Credit Card Trust,
                   Series 1996-1, Class A,
                   Zero Coupon, 2/07/03 ...................          32,527,950
NR       5,892   Global Rated Eligible Asset Trust,
                   Series 1998-A, Class A-1,
                   7.33%, 3/15/06**/*** ...................           1,767,548
AA      35,000   Honda Auto Lease Trust,
                   Series 1999-A, Class A3,
                   6.10%, 1/15/02 .........................          34,732,031
AA       7,000   IMC Home Equity Loan Trust,
                   Series 1998-3, Class A-9,
                   5.35%, 6/20/01 .........................             476,321
A        8,150   Newcourt Equipment Trust,
                   Series 1998-1, Class B,
                   5.97%, 4/20/05 .........................           8,030,243
AA       5,750@  Standard Credit Card Master Trust,
                   Series 1995-3, Class A,
                   7.85%, 2/07/02 .........................           5,758,984
                 Structured Mortgage Asset
                   Residential Trust,@@/***
NR       9,989     Series 1997-2, 8.724%, 3/15/06 .........           2,197,641
NR      11,016     Series 1997-3, 8.57%, 4/15/06 ..........           2,423,565
                                                                 --------------
                                                                    141,987,707
                                                                 --------------
                 U.S. GOVERNMENT AND AGENCY
                 SECURITIES--30.9%
                 U.S. Treasury Bonds,
        73,833@    3.625%, 4/15/28 (TIPS) .................          65,941,407
        11,000     5.25%, 11/15/28 - 2/15/29 ..............           9,064,370
        35,000@    6.125%, 11/15/27 .......................          32,571,700
                 U.S. Treasury Notes,
       108,000@    4.50%, 9/30/00 .........................         106,767,720
       100,000@    5.50%, 7/31/01 .........................          98,922,000
                                                                 --------------
                                                                    313,267,197
                                                                 --------------

See Notes to Financial Statements.

                                       2
<PAGE>

- --------------------------------------------------------------------------------
        PRINCIPAL
         AMOUNT                                                   VALUE
RATING*  (000)                     DESCRIPTION                   (NOTE 1)
- --------------------------------------------------------------------------------

                 ZERO COUPON BONDS--6.6%
                 Government Trust Certificates,
       $35,925     Series 1-D, 11/15/00 ...................      $   34,001,468
        34,630     Series 2-F, 11/15/00 ...................          32,775,806
                                                                 --------------
                                                                     66,777,274
                                                                 --------------
                 TAXABLE MUNICIPAL BONDS--3.1%
AAA      1,000   Kern County California Pension
                   Obligation, 6.27%, 8/15/01 .............             990,750
AAA      2,035   Long Beach California Pension
                   Obligation, 6.45%, 9/01/01 .............           2,021,284
AAA      6,000   Los Angeles County California
                   Pension Obligation,
                   Series D, 6.38%, 6/30/01 ...............           5,958,240
NR       5,630   Massachusetts Housing Fin. Agency,
                   Series 1991-B,
                   6.85%, 10/01/20 ........................           5,151,957
                 New York City G.O.,
A-       5,000     Series I, 6.40%, 3/15/01 ...............           4,964,950
A-       5,000     Series I, 7.24%, 4/15/01 ...............           5,012,901
Baa1     1,000   New York State Environmental
                 Facility Auth., Series A,
                   6.62%, 3/15/01 .........................             992,660
Baa1     3,345   New York State Housing Fin. Agency,
                   Series B, 7.14%, 3/15/02 ...............           3,324,395
BBB      2,000   New York State Urban
                   Development Corp., Series B,
                   6.90%, 4/01/01 .........................           1,991,300
AA       1,000   St. Josephs Health Systems California,
                   Series A, 7.02%, 7/01/01 ...............           1,000,130
                                                                 --------------
                                                                     31,408,567
                                                                 --------------
                 CORPORATE BONDS--34.2%
                 FINANCE & BANKING--20.7%
A3       1,300@  Amsouth Bancorp.,
                   6.75%, 11/01/25 ........................           1,243,632
A-       5,000     Aristar, Inc., 7.25%, 6/15/01 ..........           5,001,950
                 Associates Corp.,
AA-      5,000     6.68%, 7/25/00 .........................           5,005,600
AA-      5,000     7.46%, 3/28/00 .........................           5,014,400
A+      10,000     AT&T Corp., 5.74%, 6/30/01 .............           9,829,500
Baa2     9,000   Capital One Bank,
                   6.26%, 5/07/01 .........................           8,849,790
A-      15,000   Donaldson, Lufkin & Jenrette,
                   5.625%, 2/15/16 ........................          14,769,300
BBB-    10,000   Franchise Finance Corp.,
                   7.00%, 11/30/00 ........................           9,882,400
A+       6,750   Goldman Sachs Group,
                   6.20%, 12/15/00** ......................           6,701,603
A3       5,000   Great Western Financial Corp.,
                   6.375%, 7/01/00 ........................           4,990,450
A        4,000   Household Financial Corp.,
                   7.45%, 4/01/00 .........................           4,005,440
                 Lehman Brothers Holdings, Inc.,
A        8,000     6.75%, 9/24/01 .........................           7,940,384
A       10,000     7.25%, 4/15/03 .........................           9,924,052
A1       5,700   Meridian Bancorp Inc.,
                   6.625%, 6/15/00 ........................           5,700,904
AA-     10,715   Merrill Lynch & Co., Inc.,
                   5.75%, 11/02/02 ........................          10,342,518
Aa3      3,800   Morgan Stanley Dean Witter
                   Discover, Inc.,
                   5.75%, 2/15/01 .........................           3,760,404
Aa2     10,000   Nations Bank Corp.,
                   7.00%, 9/15/01 .........................          10,007,000
BBB+    10,000   PaineWebber Group Inc.,
                   5.81%, 6/08/01 .........................           9,789,440
A3      10,000   Popular Inc., 6.20%, 4/30/01 .............           9,855,100
A+       5,000   Prudential Funding Corp.,
                   6.00%, 5/11/01** .......................           4,944,250
BBB+     6,590   Ryder Systems Inc.,
                   9.25%, 5/15/01 .........................           6,718,813
                 Salomon Smith Barney Holdings Inc.,
Aa3     13,000     5.875%, 2/01/01 ........................          12,855,050
Aa3     12,500     6.625%, 11/30/00 .......................          12,466,500
Aa3      3,600     7.00%, 5/15/00 .........................           3,605,112
Aa3      1,925   Security Pacific Corp.,
                   11.00%, 3/01/01 ........................           2,011,125
A-      15,000   Transamerica Finance Corp.,
                   6.75%, 6/01/00 .........................          15,016,800
BB       5,500   Trinet Corporate Realty Trust,
                   7.30%, 5/15/01 .........................           5,318,170
A2        5000   Union Planters National Bank,
                   6.76%, 10/30/01 ........................           4,972,050
                                                                 --------------
                                                                    210,521,737
                                                                 --------------
                 INDUSTRIALS--4.4%
BBB     10,000     Amerco Inc., 7.49%, 9/18/01 ............          10,073,500
BBB+     7,500   Erac USA Finance Co.,
                   7.00%, 6/15/00** .......................           7,510,441
A+      10,000   Ford Motor Credit Co.,
                   6.18%, 12/27/01 ........................           9,869,300
A-       2,505   ICI Wilmington Inc.,
                   8.75%, 5/01/01 .........................           2,543,577
A2         702   Kern River Funding Corp.,
                   6.42%, 3/31/01** .......................             698,555
                 Sears Roebuck & Co.,
A-       4,250     6.50%, 6/15/00 .........................           4,240,693
A-       5,000     7.29%, 4/24/00 .........................           5,009,150
BBB      4,550   WMX TECHNOLOGIES INC.,
                   7.125%, 6/15/01 ........................           4,409,769
                                                                 --------------
                                                                     44,354,985
                                                                 --------------
                 UTILITIES--1.4%
BBB      9,000   Pacificorp Holdings Inc.,
                   6.75%, 4/01/01** .......................           8,960,310
BBB+     5,000   Potomac Capital Investment Corp.,
                   6.73%, 8/09/00** .......................           5,000,000
                                                                 --------------
                                                                     13,960,310
                                                                 --------------
                 YANKEE--7.7%
                 African Development Bank,
Aa1      5,000     7.75%, 12/15/01            5,067,000
Aaa      3,350     8.625%, 5/01/01            3,433,985
NR       8,405   Banamex Remittance Master Trust,
                   Series 1996, 7.57%, 1/01/01** ..........           8,363,271
BBB-    15,000   Empresa Electric Guacolda,
                   7.60%, 4/30/01** .......................          14,700,000
A+      18,000   Province of Quebec,
                   9.125%, 8/22/01 ........................          18,525,356

See Notes to Financial Statements.

                                       3
<PAGE>

- --------------------------------------------------------------------------------
        PRINCIPAL
         AMOUNT                                                   VALUE
RATING*  (000)                     DESCRIPTION                   (NOTE 1)
- --------------------------------------------------------------------------------

                 YANKEE (CONTINUED)
BBB    $15,000   Republic of Argentina,
                   Zero Coupon, 4/15/01 ...................      $   13,305,000
Ba+      3,000   Republic of Colombia,
                   8.00%, 6/14/01 .........................           2,970,000
BBB-    12,000   Transpatadora de Gas,
                   10.25%, 4/25/01 ........................          12,090,000
                                                                 --------------
                                                                     78,454,612
                                                                 --------------
                 Total corporate bonds ....................         347,291,644
                                                                 --------------
                 STRIPPED MONEY MARKET
                 INSTRUMENTS--10.7%
AAA     65,000   Aim Prime Money Market Portfolio,
                   Zero Coupon, 1/02/01 ...................          61,193,730
AAA     50,000   Goldman Sachs Money Market
                   Portfolio, Zero Coupon, 1/02/01 ........          47,063,150
                                                                 --------------
                                                                    108,256,880
                                                                 --------------
       NOTIONAL
        AMOUNT
         (000)
        -------
                 CALL OPTIONS PURCHASED--0.0%
      $200,000   Interest Rate Swap,
                   5.6% over 3 month LIBOR,
                     expires 8/7/00 .......................              61,550
                                                                 --------------
                 Total long-term investments before
                   call options written and investment
                   sold short
                   (cost $1,350,726,324) ..................       1,319,773,403
                                                                 --------------

                 CALL OPTIONS WRITTEN--(0.2%)
                 Interest Rate Swap,
     $(300,000)    3 month LIBOR over 3 Year CMT,
                     expires 8/8/01 .......................          (1,457,841)
      (200,000)    3 month LIBOR over 5 Year CMT,
                     expires 8/12/01 ......................            (863,734)
                                                                 --------------
                   (premiums received $1,914,957) .........          (2,321,575)
                                                                 --------------
       PRINCIPAL
        AMOUNT
         (000)
        -------
                 INVESTMENT SOLD SHORT--(4.5%)
     $ (47,500)  U.S. Treasury Bonds,
                   6.125%, 8/15/29
                   (proceeds received $46,282,812) ........         (45,280,800)
                                                                 --------------
                 Total investments, net of call options
                   written and investment sold
                   short--125.3%
                   (cost $1,302,528,555) ..................       1,272,171,028
                 Liabilities in excess of other
                   assets--(25.3)% ........................        (256,935,727)
                                                                 --------------
                 NET ASSETS--100% .........................      $1,015,235,301
                                                                 ==============

- ----------
    * Using the higher of Standard & Poor's, Moody's or Fitch's rating.
   ** Security is exempt from registration under Rule 144A of the Securities Act
      of 1933.  These  securities  may be resold  in  transactions  exempt  from
      registration to qualified institutional buyers.
  *** Illiquid securities representing 0.50% of portfolio assets.
    @ Entire or partial  principal  amount  pledged as  collateral  for  reverse
      repurchase agreements or financial futures contracts.
   @@ Security is restricted as to public resale.  The securities  were acquired
      in 1997 and have an aggregate current cost of $7,351,917.

- --------------------------------------------------------------------------------
                              KEY TO ABBREVIATIONS
     CMT   -- Constant Maturity Treasury.
     G.O.  -- General Obligation.
     LIBOR -- London InterBank Offer Rate.
     REMIC -- Real Estate Mortgage Investment Conduit.
     TIPS  -- Treasury Inflation Protection Security.
- --------------------------------------------------------------------------------

See Notes to Financial Statements.

                                       4
<PAGE>

- --------------------------------------------------------------------------------
BLK SUBSIDIARY, INC.
STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------

ASSETS
Investments at value
  (cost $1,350,726,324) (Note 1) ..........................     $ 1,319,773,403
Cash ......................................................             608,757
Deposits with brokers as collateral
  for investments sold short (Note 1) .....................          46,659,011
Receivable for investments sold ...........................          34,647,673
Interest receivable .......................................          13,223,584
Interest rate caps, at value
  (amortized cost $1,652,609) (Note 1) ....................           1,848,504
                                                                ---------------
                                                                  1,416,760,932
                                                                ---------------

LIABILITIES
Reverse repurchase agreements (Note 4) ....................         332,985,250
Investments sold short, at value
  (proceeds $46,282,812) (Note 1) .........................          45,280,800
Due to parent (Note 2) ....................................          17,719,969
Payable for investments purchased .........................           2,831,989
Call options written, at value
  (premium received $1,914,957) (Note 1) ..................           2,321,575
Due to broker-variation margin ............................             375,006
Unrealized depreciation on credit default swaps
  (Notes 1 & 3) ...........................................              11,042
                                                                ---------------
                                                                    401,525,631
                                                                ---------------
NET ASSETS ................................................     $ 1,015,235,301
                                                                ===============
Net assets were comprised of:
  Common stock, at par (Note 5) ...........................     $     1,420,106
  Paid-in capital in excess of par ........................       1,010,883,105
                                                                ---------------
                                                                  1,012,303,211
  Undistributed net investment income .....................          45,018,391
  Accumulated net realized loss ...........................         (11,619,627)
  Net unrealized depreciation .............................         (30,466,674)
                                                                ---------------
  Net assets, December 31, 1999 ...........................     $ 1,015,235,301
                                                                ===============
Net asset value per share:
  ($1,015,235,301 divided by 142,010,583 shares of
  common stock issued and outstanding) ....................     $          7.15
                                                                ===============


- --------------------------------------------------------------------------------
BLK SUBSIDIARY, INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED
DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------

NET INVESTMENT INCOME
Income
  Interest (net of premium amortization
    of  $2,554,416 and interest expense
    of $14,018,113) .......................................     $    10,842,222
                                                                ---------------
Operating expenses
  Investment advisory .....................................           2,056,362
  Administration ..........................................             514,091
  Custodian ...............................................             126,000
  Legal ...................................................             123,000
  Independent accountants .................................              39,500
  Directors ...............................................              30,500
  Miscellaneous ...........................................             100,247
                                                                ---------------
    Total operating expenses ..............................           2,989,700
                                                                ---------------
  Net investment income before excise tax .................           7,852,522
    Excise tax ............................................           2,172,405
                                                                ---------------
  Net investment income ...................................           5,680,117
                                                                ---------------

REALIZED AND UNREALIZED GAIN (LOSS) ON
  INVESTMENTS
Net realized gain (loss) on:
  Investments .............................................          (8,333,287)
  Short sales .............................................           2,169,862
  Options written .........................................             306,850
  Swaps ...................................................           3,261,750
  Futures .................................................          (4,461,249)
                                                                ---------------
                                                                     (7,056,074)
                                                                ---------------

Net change in unrealized appreciation (depreciation) on:
  Investments .............................................           4,133,807
  Short sales .............................................           1,952,509
  Options written .........................................          (2,164,373)
  Interest rate caps ......................................             924,499
  Swaps ...................................................             (98,495)
  Futures .................................................           1,453,960
                                                                ---------------
                                                                      6,201,907
                                                                ---------------
Net loss on investments ...................................            (854,167)
                                                                ---------------

NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS ...............................     $     4,825,950
                                                                ===============

                       See Notes to Financial Statements.

                                       5
<PAGE>

- --------------------------------------------------------------------------------
BLK SUBSIDIARY, INC.
STATEMENT OF CASH FLOWS
SIX MONTHS ENDED
DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------

RECONCILIATION OF NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS TO NET CASH FLOWS
  PROVIDED BY OPERATING ACTIVITIES

Net increase in net assets resulting from
  operations ..............................................     $     4,825,950
                                                                ---------------
Decrease in investments ...................................         191,992,271
Net realized loss .........................................           7,056,074
Decrease in unrealized depreciation .......................          (6,201,907)
Increase in unrealized depreciation on
  credit default swaps ....................................              11,042
Decrease in unrealized appreciation
  on interest rate swaps ..................................              87,453
Decrease in interest receivable ...........................             383,759
Increase in receivable for
  investments sold ........................................         (34,355,162)
Decrease in deposits with brokers
  for investments sold short ..............................          20,403,489
Decrease in payable
  for investments purchased ...............................         (16,762,555)
Increase in call options written ..........................           2,320,871
Decrease in interest rate caps ............................          (2,651,151)
Decrease in payable for investments
  sold short ..............................................         (21,203,760)
Decrease in broker-variation margin .......................            (845,165)
Increase in due to Parent .................................           5,153,947
                                                                ---------------
  Total adjustments .......................................     $   145,389,206
                                                                ---------------
Net cash flows provided by operating
  activities ..............................................     $   150,215,156
                                                                ===============

INCREASE (DECREASE) IN CASH
Net cash flows provided by operating activities ...........     $   150,215,156
                                                                ---------------
Cash flows used for financing activity:
  Decrease in reverse repurchase agreements ...............        (149,609,096)
                                                                ---------------
Net increase in cash ......................................             606,060
Cash at beginning of period ...............................               2,697
                                                                ---------------
Cash at end of period .....................................     $       608,757
                                                                ===============

- --------------------------------------------------------------------------------
BLK SUBSIDIARY, INC.
STATEMENTS OF CHANGES
IN NET ASSETS
(UNAUDITED)
- --------------------------------------------------------------------------------

                                            SIX MONTHS              YEAR
                                               ENDED                ENDED
                                            DECEMBER 31,           JUNE 30,
                                                1999                 1999
                                           --------------       --------------

INCREASE (DECREASE) IN
  NET ASSETS
Operations:
  Net investment income ...............    $    5,680,117       $   58,274,471
  Net realized loss on
    investments .......................        (7,056,074)          (3,150,890)
  Net change in unrealized
    appreciation/depreciation
    on investments ....................         6,201,907          (34,561,917)
                                           --------------       --------------
  Net increase
    in net assets resulting
    from operations ...................         4,825,950           20,561,664
Dividends from net
  investment income ...................                --          (60,815,696)
                                           --------------       --------------
Total increase  (decrease) ............         4,825,950          (40,254,032)

NET ASSETS
Beginning of  period ..................     1,010,409,351        1,050,663,383
                                           --------------       --------------
End of  period (including
  undistributed net
  investment income
  of $45,018,391 and
  $37,414,069, respectively) ..........    $1,015,235,301       $1,010,409,351
                                           ==============       ==============

                       See Notes to Financial Statements.

                                       6
<PAGE>

- --------------------------------------------------------------------------------
BLK SUBSIDIARY, INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                             SIX MONTHS                             FOR THE PERIOD
                                                                                ENDED                             OCTOBER 17, 1997*
                                                                             DECEMBER 31,        YEAR ENDED            THROUGH
                                                                                 1999           JUNE 30, 1999       JUNE 30, 1998
                                                                              ----------          ----------          ----------
<S>                                                                           <C>                 <C>               <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ....................................     $     7.12          $     7.40        $     7.14
                                                                              ----------          ----------        ----------
   Net investment income (net of interest expense of
     $0.10, $0.14 and $0.12, respectively) ..............................           0.04                0.41              0.28
   Net realized and unrealized loss .....................................          (0.01)              (0.26)            (0.02)
                                                                              ----------          ----------        ----------
Net increase from investment operations .................................           0.03                0.15              0.26
                                                                              ----------          ----------        ----------
Dividends from net investment income ....................................             --               (0.43)               --
                                                                              ----------          ----------        ----------
Net asset value, end of period ..........................................     $     7.15          $     7.12        $     7.40
                                                                              ==========          ==========        ==========

TOTAL INVESTMENT RETURN+.................................................           0.42%               2.03%             3.64%
                                                                              ==========          ==========        ==========
RATIOS TO AVERAGE NET ASSETS:
Operating expenses ......................................................           0.58%++             0.56%             0.56%++
Operating expenses and interest expense .................................           3.33%++             2.38%             3.01%++
Operating expenses, interest expense and excise taxes ...................           3.75%++             2.56%             3.10%++
Net investment income ...................................................           2.77%++             5.47%             5.54%++

SUPPLEMENTAL DATA:
Average net assets (in thousands) .......................................     $1,017,005          $1,065,302        $1,024,887
Portfolio turnover ......................................................             50%                148%              182%
Net assets, end of period (in thousands) ................................     $1,015,235          $1,010,409        $1,050,663
Reverse repurchase agreements outstanding,
   end of period (in thousands) .........................................     $  332,985          $  482,594        $   51,665
Asset coverage+++........................................................     $    4,049          $    3,094        $   21,336
</TABLE>

- -------------
*    Commencement of investment operations.
+    This entity is not publicly traded and therefore total investment return is
     calculated  assuming a purchase  of common  stock at the  current net asset
     value on the first  day and a sale at the  current  net asset  value on the
     last day of each period reported.  Total  investment  return for periods of
     less than one full year are not annualized.
++   Annualized.
+++  Per $1,000 of reverse repurchase agreement outstanding.

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 each of the periods  indicated.  This
information has been determined based upon financial information provided in the
financial statements.

                       See Notes to Financial Statements.

                                       7
<PAGE>

- --------------------------------------------------------------------------------
BLK SUBSIDIARY,  INC.
NOTES TO FINANCIAL STATEMENTS
(UNAUDITED)
- --------------------------------------------------------------------------------

NOTE 1. ORGANIZATION &
ACCOUNTING
POLICIES

BLK Subsidiary,  Inc. (the "Trust") was incorporated under the laws of the state
of Maryland on October 17,  1997,  and is a  diversified  closed-end  management
investment  company.  The Trust  was  incorporated  solely  for the  purpose  of
receiving all or a substantial  portion of the assets of The BlackRock 2001 Term
Trust Inc. ("BTM"),  incorporated under the laws of the State of Maryland and as
such, a wholly-owned  subsidiary of BTM. The Trust's investment  objective is to
manage a portfolio of investment  grade fixed income  securities while providing
cash  flow  definition  to BTM.  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:  The Trust values mortgage-backed,  asset-backed and other
debt securities,  swaps,  caps,  floors and  non-exchange  traded options on the
basis of current  market  quotations  provided  by  dealers or pricing  services
approved  by the  Trust's  Board of  Directors.  In  determining  the value of a
particular  security,  pricing services may use certain information with respect
to transactions in such securities, quotations from dealers, market transactions
in comparable  securities,  various relationships observed in the market between
securities, and calculated yield measures based on valuation technology commonly
employed in the market for such securities.  Exchange-traded  options are valued
at their last sales price as of the close of options  trading on the  applicable
exchanges.  In the absence of a last sale,  options are valued at the average of
the quoted bid and asked prices as of the close of business.  A futures contract
is valued at the last sale price as of the close of the commodities  exchange on
which it trades.  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 supervisionand
responsibility of the Trust's Board of Directors.

Short-term securities having a remaining maturity of 60 days or less are valued
at amortized cost which approximates market value.

REPURCHASE AGREEMENT:  In connection with transactions in repurchase agreements,
the Trust's custodian takes possession of the underlying collateral  securities,
the  value of which at least  equals  the  principal  amount  of the  repurchase
transaction,  including  accrued  interest.  To the extent  that any  repurchase
transaction   exceeds  one  business  day,  the  value  of  the   collateral  is
marked-to-market  on a daily basis to ensure the adequacy of the collateral.  If
the seller  defaults and the value of the  collateral  declines or if bankruptcy
proceedings   are  commenced  with  respect  to  the  seller  of  the  security,
realization of the collateral by the Trust may be delayed or limited.

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.

   Options,  when used by the Trust,  help in  maintaining a targeted  duration.
Duration is a measure of the price  sensitivity  of a security or a portfolio to
relative changes in interest rates. For instance, a duration of "one" means that
a portfolio's or a security's price would be expected to change by approximately
one percent  with a one percent  change in interest  rates,  while a duration of
five  would  imply  that the price  would  move  approximately  five  percent in
relation to a one percent change in interest rates.

   Option  selling and  purchasing is used by the Trust to  effectively  "hedge"
positions, or collections of positions, so that changes in interest rates do not
change the duration of the portfolio  unexpectedly.  In general,  the Trust uses
options to hedge a long or short position or an overall portfolio that is longer
or shorter than the benchmark security. A call option gives the purchaser of the
option the right (but not  obligation)  to buy, and obligates the seller to sell
(when the option is exercised), the underlying position at the exercise price at
any time or at a specified time during the option period. A put option gives the
holder the right to sell and obligates the writer to buy the underlying position
at the  exercise  price at any time or at a  specified  time  during  the option
period. Put options can be

                                       8
<PAGE>

purchased to effectively  hedge a position or a portfolio against price declines
if a portfolio  is long.  In the same sense,  call  options can be  purchased to
hedge a portfolio that is shorter than its benchmark against price changes.  The
Trust can also sell (or write)  covered  call  options  and put options to hedge
portfolio positions.

   The main risk that is associated with  purchasing  options is that the option
expires without being exercised.  In this case, the option expires worthless and
the premium paid for the option is considered the loss. The risk associated with
writing call options is that the Trust may forego the  opportunity  for a profit
if the  market  value of the  underlying  position  increases  and the option is
exercised. The risk in writing put options is that the Trust may incur a loss if
the  market  value  of the  underlying  position  decreases  and the  option  is
exercised.  In addition,  as with futures  contracts,  the Trust risks not being
able to enter into a closing transaction for the written option as the result of
an illiquid market.

SWAPS:  In a simple  interest  rate swap,  one investor  pays a floating rate of
interest on a notional principal amount and receives a fixed rate of interest on
the  same   notional   principal   amount  for  a  specified   period  of  time.
Alternatively,  an investor  may pay a fixed rate and  receive a floating  rate.
Interest rate swaps were conceived as asset/liability  management tools. In more
complex  swaps,  the notional  principal  amount may decline (or amortize)  over
time.

   Credit  default  swaps  involve the receipt or payment of fixed  amounts at a
specified rate times the notional  amount in exchange for the payment or receipt
of an amount only upon a credit event of the underlying security. See note 3 for
a summary of open swap agreements as of December 31, 1999.

   During the term of the swap,  changes in the value of the swap are recognized
as unrealized gains or losses by "marking-to-market" to reflect the market value
of the swap. When the swap is terminated,  the Trust will record a realized gain
or loss  equal to the  difference  between  the  proceeds  from (or cost of) the
closing transaction and the Trust's basis in the contract, if any.

   The Trust is exposed to credit loss in the event of non-  performance  by the
other party to the swap. However, the Trust does not anticipate  non-performance
by any  counterparty.

SWAP  OPTIONS:  Swap  options are similar to options on  securities  except that
instead of selling or purchasing the right to buy or sell a security, the writer
or  purchaser of the swap option is granting or buying the right to enter into a
previously  agreed  upon  interest  rate swap  agreement  at any time before the
expiration of the option.  Premiums  received or paid from writing or purchasing
options are recorded as liabilities or assets and are  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 commission, 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 loss on investment transactions.

   The main risk that is  associated  with  purchasing  swap options is that the
swap option  expires  without  being  exercised.  In this case,  the swap option
expires  worthless  and the premium paid for the swap option is  considered  the
loss. The main risk that is associated  with the writing of a swap option is the
market  risk of an  unfavorable  change in the value of the  interest  rate swap
underlying the written swap option.

   Swap  options may be used by the Trust to manage the  duration of the Trust's
portfolio in a manner similar to more generic options described above.

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  the  proceeds  from (or cost of) the  closing
transaction and the Trust's basis in the contract.

   Financial  futures  contracts,  when used by the Trust, help in maintaining a
targeted  duration.  Futures  contracts  can be sold to  effectively  shorten an
otherwise longer duration portfolio. In the same sense, futures contracts can be
purchased  to lengthen a portfolio  that is shorter  than its  duration  target.
Thus, by buying or selling futures contracts,  the Trust can effectively "hedge"
positions  so that  changes in interest  rates do not change the duration of the
portfolio unexpectedly.

   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

                                       9
<PAGE>

hedged  assets.  The Trust is also at the risk of not being able to enter into a
closing  transaction for the futures contract  because of an illiquid  secondary
market. In addition, since futures are used to shorten or lengthen a portfolio's
duration,  there is a risk that the  portfolio  may have  temporarily  performed
better  without the hedge or that the Trust may lose the  opportunity to realize
appreciation in the market price of the underlying positions.

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  security  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  LENDING:  The Trust may lend its  portfolio  securities to qualified
institutions.  The loans are secured by collateral at least equal, at all times,
to the market  value of the  securities  loaned.  The Trust may bear the risk of
delay in recovery of, or even loss of rights in, the  securities  loaned  should
the borrower of the securities fail financially. The Trust receives compensation
for lending its  securities in the form of interest on the loan.  The Trust also
continues to receive interest on the securities  loaned, and any gain or loss in
the market price of the securities  loaned that may occur during the term of the
loan will be for the account of the Trust.  The Trust did not engage in security
lending during the period ended December 31, 1999.

INTEREST  RATE CAPS:  Interest  rate caps are  similar to  interest  rate swaps,
except  that one party  agrees to pay a fee,  while  the  other  party  pays the
excess, if any, of a floating rate over a specified fixed or floating rate.

   Interest  rate caps are  intended to both manage the  duration of the Trust's
portfolio and its exposure to changes in short term rates.  Owning interest rate
caps reduces the  portfolio's  duration,  making it less sensitive to changes in
interest rates from a market value  perspective.  The effect on income  involves
protection from rising short term rates,  which the Trust experiences  primarily
in the form of leverage.

   The Trust is exposed to credit  loss in the event of  non-performance  by the
other party to the interest  rate cap.  However,  the Trust does not  anticipate
non-performance by any counterparty.

   Transaction  fees paid or received by the Trust are  recognized  as assets or
liabilities  and amortized or accreted into interest  expense or income over the
life of the interest rate cap. The asset or liability is subsequentlyadjusted to
the current market value of the interest rate cap purchased or sold.  Changes in
the  value of the  interest  rate cap are  recognized  as  unrealized  gains and
losses.

SECURITIES  TRANSACTIONS AND NET INVESTMENT  INCOME:  Security  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  and  accretes  discount  on
securities purchased using the interest method.

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 substantially all of its taxable income to shareholder. Therefore, no
federal income tax provision is required.  As part of its tax planning strategy,
the Trust  intends to retain a portion of its  taxable  income and pay an excise
tax on the undistributed amount.

RECLASSIFICATION  OF  CAPITAL  ACCOUNTS:  The  Trust  accounts  for and  reports
distributions  to  shareholders  in  accordance  with the American  Institute of
Certified  Public  Accountants'  Statement  of  Position  93-2:   Determination,
Disclosure,  and Financial Statement  Presentation of Income,  Capital Gain, and
Return of Capital  Distributions by Investment  Companies.  The effect caused by
applying  this   statement  was  to  decrease   paid-in   capital  and  increase
undistributed  net investment  income by $1,924,205 due to certain  expenses not
being deductible for tax purposes. Net investment income, net realized gains and
net assets were not affected by this change.

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

NOTE 2. AGREEMENTS

The  Trust  has  an  Investment  Advisory  Agreement  with  BlackRock  Financial
Management, Inc. (the "Advisor"), a wholly-owned subsidiary of BlackRockAdvisors
Inc., which is a wholly-owned subsidiary of BlackRock, Inc., which in turn is an
indirect  majority-owned   subsidiary  of  PNC  Bank  Corp.  The  Trust  has  an
Administration  Agreement  with Mitchell  Hutchins  Asset  Management  Inc. (the
"Administrator"), a wholly-owned subsidiary of PaineWebber Incorporated.

   The Trust reimburses the 2001 Term Trust for its pro-rata share of applicable
expenses,  including  investment advisory and administrative  fees, in an amount
equal to the proportion-

                                       10
<PAGE>

ate amount of net assets which are held by the Trust  relative to the net assets
of the 2001 Term Trust.

NOTE 3. PORTFOLIO
SECURITIES

Purchases and sales of investment securities,  other than short-term investments
and  dollar  rolls,  for the six  months  ended  December  31,  1999  aggregated
$733,322,037 and $911,919,886, respectively.

   The Trust may invest up to 40% of its total  assets in  securities  which are
not readily  marketable,  including those which are restricted as to disposition
under securities law ("restricted securities").  At December 31, 1999, the Trust
held 6.8% of its portfolio assets in restricted securities.

   The Trust may from time to time  purchase  in the  secondary  market  certain
mortgage pass-through  securities packaged or master serviced by affiliates such
as PNC Mortgage  Securities Corp. (or Sears Mortgage if PNC Mortgage  Securities
Corp.  succeeded to rights and duties of Sears) or mortgage  related  securities
containing  loans  or  mortgages  originated  by PNC  Bank  or  its  affiliates,
including Midland Loan Services,Inc. It is possible under certain circumstances,
PNC  Mortgage  Securities  Corp.  or  its  affiliates,  including  Midland  Loan
Services,  Inc.  could have  interests  that are in conflict with the holders of
these mortgage backed securities, and such holders could have rights against PNC
Mortgage Securities Corp. or its affiliates,  including Midland Loan Securities,
Inc.

   The federal income tax basis of the Trust's  investments at December 31, 1999
was substantially the same as the basis for financial reporting and accordingly,
net  unrealized  depreciation  for federal  income tax purposes was  $30,466,674
(gross      unrealized      appreciation--$18,997,367;      gross     unrealized
depreciation--$49,464,041).

   Details of open  financial  futures  contracts  at  December  31, 1999 are as
follows:

                                      VALUE AT       VALUE AT
NUMBER OF               EXPIRATION     TRADE       DECEMBER 31,     UNREALIZED
CONTRACTS     TYPE         DATE        DATE           1999         DEPRECIATION
- ---------    -----      ----------    -------      ------------     ----------
Long position:
   750    30 Yr.T-Bond   3/2000     $68,497,125    $68,203,125      $(294,000)
                                                                    =========
   Details of the interest rate cap held at December 31, 1999 are as follows:
NOTIONAL                                               VALUE AT
 AMOUNT   FIXED  FLOATING  TERMINATION   AMORTIZED   DECEMBER 31,  UNREALIZED
  (000)    RATE    RATE       DATE         COST         1999       APPRECIATION
- --------  -----  --------  -----------   ---------   -----------   ------------
120,000   6.00%   3-month    2/19/02    $1,652,609   $1,848,504      $195,895
                   LIBOR                                             ========

   Details of open credit default swaps at December 31, 1999 are as follows:

NOTIONAL
 AMOUNT                                                              UNREALIZED
  (000)     TERMS                                                  DEPRECIATION
 -------    -----                                                  ------------
  Sold:
$(15,000)   An  agreement  with  Salomon  Brothers  International     $(10,920)
            Limited  dated July 16, 1999 (trade  date) to receive
            1.68% per year times the  notional  amount.  The fund
            makes a payment only upon a credit event with respect
            to News America Holdings,  the referenced security in
            the contract,  of the notional amount.  The scheduled
            termination date is June 15, 2001.

(15,000)    An  agreement  with  Salomon  Brothers  International         (122)
            Limited  dated July 20, 1999 (trade  date) to receive
            1% per year times the notional amount. The fund makes
            a payment  only upon a credit  event with  respect to
            MCI Worldcom  Inc.,  the  referenced  security in the
            contract,  of  the  notional  amount.  The  scheduled
            termination date is June 15, 2001.
                                                                       --------
                                                                       $(11,042)
                                                                       ========

NOTE 4. BORROWINGS

REVERSE  REPURCHASE  AGREEMENTS:   The  Trust  enters  into  reverse  repurchase
agreements with qualified, third party broker-dealers as determined by and under
the direction of the Trust's  Board of  Directors.  Interest on the value of the
reverse  repurchase  agreements  issued  and  outstanding  will  be  based  upon
competitive  market rates at the time of issuance.  At the time the Trust enters
into a reverse repurchase  agreement,  it establishes and maintains a segregated
account with the lender containing  liquid high-grade  securities having a value
not less than the repurchase price,  including accrued interest,  of the reverse
repurchase agreement.

   The average daily balance of reverse repurchase agreements outstanding during
the six months ended  December 31, 1999,  was  approximately  $439,558,194  at a
weighted  average  interest rate of  approximately  4.96%. The maximum amount of
reverse repurchase agreements  outstanding at any month-end during the year, was
$613,051,938 as of August 31, 1999 which was 32.62% of total assets.

DOLLAR  ROLLS:  The Trust  enters  into  dollar  rolls in which the Trust  sells
securities  for delivery in the current  month and  simultaneously  contracts to
repurchase  substantially similar (same type, coupon and maturity) securities on
a specified future date.  During the roll period the Trust forgoes principal and
interest paid on the securities.The  Trust is compensated by the interest earned
on the cash  proceeds of the initial sale and by the lower  repurchase  price at
the future date.

                                       11
<PAGE>

                                                             #

   The Trust  did not enter  into  dollar  rolls  during  the six  months  ended
December 31, 1999.

NOTE 5. CAPITAL

There are 200 million  shares of $.01 par value  common  stock  authorized.  BTM
owned all of the 142,010,583 shares outstanding at December 31, 1999.

                                       12
<PAGE>

BLACKROCK


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

OFFICERS
Ralph L. Schlosstein, PRESIDENT
Scott Amero, VICE PRESIDENT
Keith T. Anderson, VICE PRESIDENT
Michael C. Huebsch, VICE PRESIDENT
Robert S. Kapito, VICE PRESIDENT
Richard M. Shea, VICE PRESIDENT/TAX
Henry Gabbay, TREASURER
James Kong, ASSISTANT TREASURER
Karen H. Sabath, SECRETARY

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

ADMINISTRATOR
Mitchell Hutchins Asset Management Inc.
51 West 52nd Street
New York, NY 10019

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

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

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

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

   The accompanying financial statements as of December 31, 1999 were not
audited and accordingly, no opinion is expressed on them.


                              BLK SUBSIDIARY, INC.
                   c/o Mitchell Hutchins Asset Management Inc.
                               51 West 52nd Street
                               New York, NY 10019
                                 (800) 227-7BFM






BLK SUBSIDIARY, INC.
==========================
SEMI-ANNUAL REPORT
DECEMBER 31, 1999

[RECYCLE LOGO] Printed on recycled paper                             092477-10-8



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