BLACKROCK 1999 TERM TRUST INC
N-30D, 1997-09-04
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- --------------------------------------------------------------------------------
BNN Subsidiary, Inc.
Portfolio of Investments
June 30, 1997 (Unaudited)
- --------------------------------------------------------------------------------
         Principal
           Amount                                                     Value
Rating*    (000)                Description                          (Note 1)
- --------------------------------------------------------------------------------
                     LONG-TERM INVESTMENTS--130.6%
                     Mortgage Pass-Throughs--5.4%
          $8,352+    Federal Home Loan Mortgage
                       Corporation, 5.50%, 9/01/99 ...........    $  8,261,438
AAA        2,580     Federal Housing Administration
                       Massachusetts St. Hsg. Fin. Agcy.,
                       Series C, 6.85%, 4/01/19 ..............       2,366,918
                                                                  ------------
                                                                    10,628,356
                                                                  ------------
                     Multiple Class Mortgage
                     Pass-Throughs--3.8%
AAA          497     Capstead Securities Corporation IV,
                       Series 1992-4, Class H,
                         12/25/20 (ARM) ......................         569,535
AAA        3,267     CBA Mortgage Corporation,
                       Series 1993-C1, Class A-2,
                         12/25/03 ............................      3,322,402
                     Federal Home Loan Mortgage Corporation,
                       Multiclass Mortgage Participation
                       Certificates,
           1,231       Series 172, Class 172-H, 5/15/20 ......       1,233,718
           1,183       Series 1330, Class 1330-M,
                         9/15/99, (ARM) ......................        711,649
                     Federal National Mortgage Association,
                       REMIC Pass-Through Certificates,
           1,030         Trust 1992 -176, Class 176-FA,
                           10/25/99 ..........................      1,007,690
           6,065         Trust 1994-8, Class 8-TA,
                           9/17/13 (I) .......................        451,177
AAA           60     Structured Asset Securities Corporation,
                       Series 1996, Class A, 2/25/28 .........          59,679
                                                                  ------------
                                                                     7,355,850
                                                                  ------------
                     Corporate Bonds--73.6%
                     Finance & Banking--34.6%
Aa3        3,350     Associates Corporation of
                       North America,
                       6.75%, 10/15/99 .......................       3,375,962
Aa3        5,000     CIT Group Holdings Incorporated,
                       5.875%, 12/09/99 ......................       4,935,650
A2         4,200     Citicorp, 9.75%, 8/01/99 ................       4,470,144
A1         2,500++   Goldman Sachs Group LP,
                       6.875%, 9/15/99 .......................       2,518,000
A3         3,000     Hartford National Corporation,
                       9.85%, 6/01/99 ........................       3,183,600
                     International Lease Finance
                       Corporation,
A1         1,100       6.09%, 11/08/99 .......................       1,090,540
A1         4,000       6.30%, 11/01/99 .......................       3,981,630
Baa1       5,000     Lehman Brothers Holdings
                       Incorporated, 6.71%, 10/12/99 .........       5,008,850
Baa3       2,000     Meditrust, 7.25%, 8/16/99 ...............       2,021,320
A1         2,000     Morgan Stanley Group Incorporated,
                       5.625%, 3/01/99 .......................       1,978,725
A1         5,000++   Paccar Financial Corporation,
                       5.84%, 6/15/99 ........................       4,948,800
Baa1       3,500     PaineWebber Group Incorporated,
                       6.31%, 7/22/99 ........................       3,476,630
Baa1       2,000     Salomon, Inc. 7.43%, 12/30/98 ...........       2,029,700
A2         4,000     Security Pacific Corporation,
                       9.75%, 5/15/99 ........................       4,234,139
A3         5,000     Shawmut National Corporation,
                       8.625%, 12/15/99 ......................       5,232,404
                     Smith Barney Holdings Incorporated,
A2         1,500       7.875%, 10/01/99 ......................       1,544,685
A2           529       7.98%, 3/01/00 ........................         546,513
A3         5,000++   Transamerica Finance Corporation,
                       5.97%, 12/09/99 .......................       4,935,392
Aa3        3,000     Travelers Group Incorporated,
                       7.75%, 6/15/99 ........................       3,077,250
A2         5,000     Union Planters National Bank,
                       6.47%, 10/29/99 .......................       4,995,862
                                                                  ------------
                                                                    67,585,796
                                                                  ------------
                     Corporate Bonds
                     Industrials--31.7%
Baa1       4,400     Alco Capital Resource Incorporated,
                       6.83%, 5/10/99 ........................       4,431,023
A1         1,895     Anheuser Busch Companies
                       Incorporated, 8.75%, 12/01/99 .........       1,996,743
A1         5,000     Bass America Incorporated,
                       6.75%, 8/01/99 ........................       5,035,000
A3         5,000     Chrysler Financial Corporation,
                       9.50%, 12/15/99 .......................       5,339,550
A2         1,612     Kern River Funding, 144A,
                       Series A, 6.42%, 3/31/01 ..............       1,600,856
Baa2       5,000     McDonnell Douglas Finance
                       Corporation, 6.30%, 12/23/99 ..........       4,970,750
Baa2       3,000     MCN Investment Corporation,
                       5.84%, 2/01/99 ........................       2,974,770
Baa2       4,000     Nabisco Brands Incorporated,
                       8.30%, 4/15/99 ........................       4,104,320
A2         2,000     National Fuel Gas Company,
                       5.58%, 3/01/99 ........................       1,977,960
BBB-       7,000     NWCG Holding Corporation,
                       Series B, Zero Coupon, 6/15/99 ........       6,101,776
Baa2       2,000     Occidental Petroleum Corporation,
                       6.08%, 11/26/99 .......................       1,971,020
BBB-       2,750     Pulte Home Corporation,
                       10.125%, 7/15/99 ......................       2,894,623
A2         5,000     Sears Roebuck & Company,
                       7.75%, 10/25/99 .......................       5,131,550
A1         3,000     Texaco Capital Incorporated,
                       9.00%, 12/15/99 .......................       3,178,290
A3         1,000     Textron Financial Corporation, 144A,
                       7.125%, 10/05/99 ......................       1,009,562
A+         3,000     TTX Company,
                       6.28%, 6/28/99 ........................       2,986,650
Baa2       2,500     Union Oil Company,
                       8.40%, 1/15/99 ........................       2,569,775
A2         4,000     Walt Disney Corporation,144A,
                       1.50%, 10/20/99 .......................       3,582,241
                                                                  ------------
                                                                    61,856,459
                                                                  ------------

See Notes to Financial Statements.


                                       1
<PAGE>

- --------------------------------------------------------------------------------
         Principal
           Amount                                                     Value
Rating*    (000)                Description                          (Note 1)
- --------------------------------------------------------------------------------
                     Corporate Bonds
                     Utilities--6.6%
A1        $4,750     Alabama Power Company,
                       6.375%, 8/01/99 .......................    $  4,744,443
A2         4,000     Atlanta Gas Light Company,
                       7.30%, 12/10/99 .......................       4,074,304
AA         2,000     California Petroleum Transport
                       Corporation, 7.30%, 4/01/99 ...........       2,028,983
BBB+       2,000     Potomac Capital Investment
                       Corporation, 6.73%, 8/09/99 ...........       2,007,203
                                                                  ------------
                                                                    12,854,933
                                                                  ------------
                     Corporate Bonds
                     Yankee--0.7%
A3         1,272     Nova Corporation of Alberta,
                       7.25%, 7/06/99 ........................       1,291,067
                                                                  ------------
                     Asset-Backed Securities--13.2%
AAA        1,871     Banc One Auto Grantor Trust,
                       Series 1996-A, Class A,
                       6.10%, 10/15/02 .......................       1,872,127
AAA        3,536     Chevy Chase Auto Receivables,
                       Series 1997-1, Class A,
                       6.50%, 10/15/03 .......................       3,546,609
AAA        5,000     Dayton Hudson Credit Card Trust,
                       Series 1995-1, Class A,
                       6.10%, 2/25/02 ........................       5,002,345
AAA        2,391     Fifth Third Bank Auto Trust,
                       Series 1996-B, Class A,
                       6.45%, 3/15/02 ........................       2,397,555
AAA        2,403     Ford Credit Grantor Trust,
                       Series 1995-B, Class A,
                       5.90%, 10/15/00 .......................       2,397,982
AAA        8,225++   Prime Credit Card Trust,
                       Series 1992-2, Class A,
                       7.45%, 11/15/02 .......................       8,413,920
AAA        2,000     Standard Credit Card Master Trust,
                       Series 1995-3, Class A,
                       7.85%, 2/07/02 ........................       2,063,438
                                                                  ------------
                                                                    25,693,976
                                                                  ------------
                     Stripped Mortgage-Backed
                     Securities--13.9%
                     Federal Home Loan Mortgage
                       Corporation, Multiclass Mortgage
                       Participation Certificates,
           5,773+      Series 1359, Class 1359-C,
                         9/15/99, (P/O) ......................       5,224,901
           1,452       Series 1719, Class 1719-C,
                         4/15/99, (P/O) ......................       1,351,565
           9,269+      Series 1887, Class 1887-J,
                         7/15/99, (P/O) ......................       8,144,851
                     Federal National Mortgage Association,
                       REMIC Pass-Through Certificates,
           1,443       Trust 1992-62, Class 62-H,
                         5/25/99, (P/O) ......................       1,298,348
           3,798+      Trust 1993-111, Class 111-A,
                         11/25/17, (P/O) .....................       3,595,074
             898       Trust 1993-176, Class 176-B,
                         6/25/18 (P/O) .......................         872,490
           6,862+      Trust 1994-47, Class 47-B,
                         9/25/22, (I/O) ......................       6,358,003
AAA       35,703     Sears Mortgage Corporation,
                       Series 1992-7, Class 7-X,
                         5/25/22, (I/O) ......................         357,034
                                                                  ------------
                                                                    27,202,266
                                                                  ------------
                     U.S Government Securities--5.3%
                     United States Treasury Notes,
           6,095+      5.875%, 11/15/99 ......................       6,055,931
           3,000+      6.00%, 8/15/99 ........................       2,992,500
           1,315       6.625%, 3/31/02 .......................       1,326,914
                                                                  ------------
                                                                    10,375,345
                                                                  ------------
                     Municipal Bonds--12.8%
AAA        2,000     Alameda County California Pension,
                       Series A, 7.35%, 12/01/99 .............       2,043,900
AAA        2,295     Essex County,
                       Zero Coupon, 11/15/99 .................       1,979,828
AAA        1,500     Long Beach California Pension,
                       6.26%, 9/01/99 ........................       1,496,550
Baa1         500     Los Angeles County California Pension,
                       Series A, 7.81%, 6/30/99 ..............         511,860
Baa1       3,000     New York St. Dormitory Authority
                       Revenues, 6.32%, 4/01/99 ..............       2,991,330
Baa1       1,550     New York St. Dormitory Authority
                       Revenues Pension Oblig.,
                       6.45%, 10/01/99 .......................       1,548,512
Baa1       5,000     New York, New York, Series G,
                       6.23%, 2/01/99 ........................       4,981,900
AAA          497     North Slope Borough Alaska,
                       Series A, Zero Coupon, 6/30/99 ........         437,919
AAA        5,000     Oakland California Pension,
                       Series A, 6.20%, 12/15/99 .............       4,983,000
AAA        3,000     Ventura County California
                       Pension Oblig., 5.92%, 11/01/99 .......       2,972,160
AAA        1,000     Western Minnesota Muni.
                       Pwr. Agcy. Supply, Series A,
                       6.05%, 1/01/99 ........................         997,740
                                                                  ------------
                                                                    24,944,699
                                                                  ------------

See Notes to Financial Statements.


                                       2
<PAGE>

- --------------------------------------------------------------------------------
         Principal
           Amount                                                     Value
Rating*    (000)                Description                          (Note 1)
- --------------------------------------------------------------------------------
                     Certificate of Deposit--2.6%
        $  5,000     MBNA America Bank, N. A.,
                       6.15%, 6/19/98 ........................    $  5,000,000
                                                                  ------------
                     Total Long-Term Investments
                       (cost $255,076,514) ...................     254,788,747

                     SHORT-TERM INVESTMENTS--0.2%
                     Repurchase Agreement--0.2%
             400     State Street Bank, &Trust Co.
                       Repo, 5.6%  dated  6/30/97,
                         due 7/1/97 in the amount of
                         $400,062 (cost $400,000
                         collateralized by $405,000
                         U.S. Treasury Note, 6.25% due
                         3/31/99, Value including
                         accrued interest $412,920 ...........         400,000
                                                                  ------------
                     Total Investments Before Security
                     Sold Short--130.8%
                       (Cost $255,476,514) ...................     255,188,747

                     SECURITY SOLD SHORT--(7.7%)
         (15,000)    United States Treasury Notes,
                       6.125%, 8/31/98 .......................     (15,037,500)
                       (Proceeds $14,960,156)                     ------------
                     Total Investments net of security
                       sold short--123.1%
                       (cost $240,516,358) ...................     240,151,247
                     Liabilities in excess of other
                       assets--(23.1%) .......................     (45,096,218)
                                                                  ------------
                     NET ASSETS--100% ........................    $195,055,029
                                                                  ============

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

 #   One contract equals 100,000 face value.

 +   (Partial)  principal  amount pledged as collateral  for reverse  repurchase
     agreements.

++   Entire  principal  amount  pledged as  collateral  for  reverse  repurchase
     agreements.


- --------------------------------------------------------------------------------
                              KEY TO ABBREVIATIONS
         ARM -- Adjustable Rate Mortgage.
         CMO -- Collateralized Mortgage Obligation.
         I/O -- Interest Only.
           I -- Denotes a CMO with Interest only characteristics.
           P -- Denotes a CMO with Principal only characteristics.
         P/O -- Principal Only.
       REMIC -- Real Estate Mortgage Investment Conduit.
- --------------------------------------------------------------------------------

See Notes to Financial Statements.


                                       3
<PAGE>

- --------------------------------------------------------------------------------
BNN Subsidiary, Inc.
Statement of Assets and Liabilities
June 30, 1997 (Unaudited)
- --------------------------------------------------------------------------------
Assets
Investments, at value (cost $255,476,514)
   (Note 1) ..............................................        $ 255,188,747
Cash .....................................................              109,648
Deposits with brokers as collateral for
   investments sold short (Note 1) .......................           15,318,750
Interest receivable ......................................            3,454,709
Receivable for Investments sold ..........................              179,401
                                                                  -------------
                                                                    274,251,255
                                                                  -------------
Liabilities
Reverse repurchase agreements (Note 4) ...................           62,465,875
Investments sold short, at value
   (proceeds $14,960,156) (Note 1) .......................           15,037,500
Due to Parent (Note 2) ...................................            1,208,497
Interest payable .........................................              484,354
                                                                  -------------
                                                                     79,196,226
                                                                  -------------
Net Assets ...............................................        $ 195,055,029
                                                                  =============
Net assets were comprised of:
   Common stock, at par (Note 5) .........................        $     216,106
   Paid-in capital in excess of par ......................          185,144,525
                                                                  -------------
                                                                    185,360,631
   Undistributed net investment income ...................           10,289,599
   Accumulated net realized loss .........................             (230,090)
   Net unrealized depreciation ...........................             (365,111)
                                                                  -------------
   Net assets, June 30, 1997 .............................        $ 195,055,029
                                                                  =============

Net asset value per share:
   ($195,055,029/ 21,610,583 shares of
   common stock issued and outstanding) ..................               $ 9.03
                                                                         ======




- --------------------------------------------------------------------------------
BNN Subsidiary, Inc.
Statement of Operations
Six Months Ended June 30, 1997 (Unaudited)
- --------------------------------------------------------------------------------
Net Investment Income
Income
   Interest (net of premium amortization of
      $512,247 and net of interest expense of
      $2,046,509 kudfh ...................................          $ 6,001,612
                                                                    -----------
Operating expenses
   Investment advisory ...................................              402,000
   Administration ........................................               95,000
   Reports to Shareholders ...............................               34,000
   Custodian .............................................               27,000
   Directors .............................................               18,000
   Audit .................................................                7,000
   Miscellaneous .........................................               64,448
                                                                    -----------
      Total operating expenses ...........................              647,448
                                                                    -----------
Net investment income ....................................            5,354,164
                                                                    -----------
Realized and Unrealized Gain (Loss) on
Investments (Note 3)
Net realized loss on Investments .........................             (288,114)
                                                                    -----------
Net change in unrealized depreciation on
   Investments ...........................................              542,287
   Short sales ...........................................               28,050
                                                                    -----------
                                                                        570,337
                                                                    -----------
Net gain on investments ..................................              282,223
                                                                    -----------
Net Increase In Net Assets Resulting
   from Operations .......................................          $ 5,636,387
                                                                    ===========

See Notes to Financial Statements.


                                       4
<PAGE>

- --------------------------------------------------------------------------------
BNN Subsidiary, Inc.
Statement of Cash Flows
Six months Ended June 30, 1997 (Unaudited)
- --------------------------------------------------------------------------------
Increase (Decrease) in Cash
Cash flows used for operating activities:
   Interest received .......................................      $   8,338,724
   Operating expenses paid .................................           (966,635)
   Interest expense paid ...................................         (1,866,713)
   Purchase of short-term portfolio
     investments, net ......................................          3,714,257
   Purchase of long-term portfolio investments .............       (110,969,077)
   Proceeds from disposition of long-term
     portfolio investments .................................         88,175,560
   Other ...................................................             47,431
                                                                  -------------
   Net cash flows used for operating activities ............        (13,526,453)
                                                                  -------------
Cash flows provided by financing activities:
   Increase in reverse repurchase agreements ...............         13,612,875
   Cash dividends paid .....................................                 --
                                                                  -------------
   Net cash flows provided by financing activities .........         13,612,875
                                                                  -------------
Net increase in cash .......................................             86,422
Cash at beginning of period ................................             23,226
                                                                  -------------
Cash at end of period ......................................      $     109,648
                                                                  =============

Reconciliation of Net Increase in Net Assets
Resulting from Operations to Net Cash Flows
Used for Operating Activities
Net increase in net assets resulting
  from operations ..........................................      $   5,636,387
                                                                  -------------
Increase in investments ....................................        (17,945,926)
Net realized loss ..........................................            288,115
Increase in unrealized depreciation ........................           (570,337)
Decrease in receivable for investments sold ................            668,372
Increase in interest receivable ............................           (221,644)
Decrease in deposits with brokers for
   short sales .............................................             56,250
Increase in other assets ...................................             47,432
Decrease in securities sold short ..........................            (28,050)
Decrease in payable for investments
   purchased ...............................................         (1,917,679)
Increase in due to Parent ..................................            600,018
Decrease in accrued expenses and other liabilities .........           (139,391)
                                                                  -------------
Total adjustments ..........................................        (19,162,840)
                                                                  -------------
   Net cash flows used for operating activities ............      $ (13,526,453)
                                                                  ============= 




- --------------------------------------------------------------------------------
BNN Subsidiary, Inc.
Statement of Changes
in Net Assets (Unaudited)
- --------------------------------------------------------------------------------
                                                                 For the period
                                               Six Months        July 19, 1996
                                                 Ended           (commencement
                                                June 30,       of operations) to
                                                  1997         December 31, 1996
                                             -------------     ----------------
Increase (Decrease)
in Net Assets

Operations:

  Net investment income ..............       $   5,354,164       $   4,935,435

  Net realized gain/loss on
    investments ......................            (288,114)             58,024

  Net change in unrealized
    (depreciation) on
    investments ......................             570,337            (935,448)
                                             -------------       -------------

  Net increase in net assets
    resulting from operations ........           5,636,387           4,058,011


Transfer of assets
  from BlackRock 1999
  Term Trust Inc. in exchange
  for shares issued ..................                  --         185,360,631
                                             -------------       -------------
Total increase .......................           5,636,387         189,418,642




Net Assets

Beginning of period ..................         189,418,642                  --
                                             -------------       -------------
End of period ........................       $ 195,055,029       $ 189,418,642
                                             =============       =============

See Notes to Financial Statements.


                                       5
<PAGE>

- --------------------------------------------------------------------------------
BNN Subsidiary, Inc.
Financial Highlights (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                                July 19,
                                                                             Six Months           1996*
                                                                               Ended             through
                                                                              June 30,         December 31,
                                                                               1997               1996
                                                                             ---------         ------------
<S>                                                                         <C>                <C>     
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ...............................          $ 8.76             $ 8.57
                                                                              ------             ------
  Net investment income (net of $0.09 and $0.05 of interest expense,
  respectively) ....................................................             .25                .23
  Net realized and unrealized gain (loss) on investments ...........             .02               (.04)
                                                                              ------             ------
Net increase from investment operations ............................             .27                .19
                                                                              ------             ------
Dividends from net investment income ...............................              --                 --
                                                                              ------             ------
Net asset value, end of period .....................................          $ 9.03             $ 8.76
                                                                              ======             ======
TOTAL INVESTMENT RETURN+: ..........................................            3.31%              2.22%

RATIOS TO AVERAGE NET ASSETS:++
Operating expenses@ ................................................             .67%++             .61%
Net investment income ..............................................            5.52%++            5.82%

SUPPLEMENTAL DATA:
Average net assets (in thousands) ..................................        $195,520           $186,426
Portfolio turnover .................................................              31%                12%
Net assets, end of period (in thousands) ...........................        $195,055           $189,419
Reverse repurchase agreements outstanding, end of
  period (in thousands) ............................................        $ 62,466           $ 48,853
Asset coverage+++ ..................................................        $  4,123           $  4,877
</TABLE>

- ----------
*    Commencement of investment operations.

@    The ratio of operating expenses, including interest expense, to average net
     assets was 2.78%++ and 1.02% for the period  indicated  above. The ratio of
     operating  expenses,  including interest expense and excise tax, to average
     net assets was 2.78%++ and 1.07% for the period indicated above.

+    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.  Dividends are assumed,  for purposes of
     this  calculation,  to be  reinvested.  This  calculation  does not reflect
     brokerage commissions. 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 and market value data for
     the Trust's shares.


                                       6
<PAGE>

- --------------------------------------------------------------------------------
BNN Subsidiary, Inc.
Notes to Financial Statements (Unaudited)
- --------------------------------------------------------------------------------

Note 1. Accounting Policies

BNN Subsidiary, Inc. was incorporated under the laws of the State of Maryland on
May 15, 1996, and is a diversified closed-end management investment company. The
Fund was  incorporated  solely for the purpose of receiving all or a substantial
portion of the assets of The BlackRock 1999 Term Trust Inc.,  incorporated under
the laws of the State of Maryland  on October  22, 1992 (the "1999 Term  Trust")
and as such,  a  wholly-owned  subsidiary  of the 1999 Term  Trust.  The Trust's
investment  objective is to manage a portfolio of investment  grade fixed income
securities  while  providing  cash flow  definition  to the 1999 Term Trust.  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 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  unless the Trust's  Board of Directors
determine that such price does not reflect its fair value, in which case it will
be valued at its fair value as determined by the Trust's Board of Directors. 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 60  days or less  are  valued  at
amortized  cost,  if their term to maturity  from date of purchase is 60 days or
less.  Short-term  securities with a term to maturity  greater than 60 days from
the date of purchase are valued at current market quotations until maturity.

     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.


                                       7
<PAGE>

     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  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 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.

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
more  volatile  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  hedged assets.  The Trust is also at 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 underlying
positions.


                                       8
<PAGE>

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 less or greater 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
securities lending during the six months ended June 30, 1997.

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  accretes  discount  and  amortizes  premium  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 shareholders.  Therefore,
no  federal  income  tax  provision  is  required.  As part of its tax  planning
strategy, the Trust may retain a portion of its taxable income and pay an excise
tax on the undistributed amounts.

Dividends  and  Distributions:   The  Trust  declares  and  pays  dividends  and
distributions,   first  from  net  investment  income  then  from  net  realized
short-term capital gains and other sources, if necessary.  Net long-term capital
gains,  if any,  in  excess  of loss  carryforwards  are  distributed  at  least
annually. Dividends and distributions are recorded on the ex-dividend date.

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  "Adviser") a  wholly-owned  corporate  subsidiary of PNC
Asset  Management  Group,  Inc., the holding company for PNC's asset  management
business,  and an  Administration  Agreement with  Prudential  Investments  Fund
Management,   Inc.  ("PIFM"),  an  indirect,   wholly-owned  subsidiary  of  The
Prudential Insurance Co. of America.

     The  Trust  reimburses  the  1999  Term  Trust  for its  pro-rata  share of
applicable  expenses,  including investment advisory and administrative fees, in
an amount equal to the proportionate  amount of net assets which are held by the
Trust relative to the net assets of the 1999 Term Trust.


Note 3. Portfolio Securities

Purchases and sales of investment  securities,  other than short-term invesments
and dollar rolls, for the six months ended June 30, 1997 aggregated $109,651,415
and $77,310,578, 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 June 30, 1997, the Trust did not
hold any illiquid securities.


                                       9
<PAGE>

     The Trust may from time to time  purchase in the secondary  market  certain
mortgage  pass-through  securities  packaged or master  serviced by 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.  It is possible  under
certain circumstances PNC Mortgage Securities Corp. or its affiliates 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.

     The federal  income tax basis of the Trust's  investments  at June 30, 1997
was  substantially   the  same  as  the  basis  for  financial   reporting  and,
accordingly,  net  unrealized  depreciation  for federal income tax purposes was
$365,111  (gross   unrealized   appreciation  --  $921,170;   gross   unrealized
depreciation -- $1,286,281).

Note 4. Borrowings

Reverse  Repurchase  Agreements:  The Trust may enter  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
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 will establish and maintain a segregated
account with the lender the value of which at least equals the principal  amount
of the reverse repurchase transaction, including accrued interest.

     The average  daily  balance of reverse  repurchase  agreements  outstanding
during the six months  ended June 30, 1997 was  approximately  $70,993,999  at a
weighted  average  interest rate of  approximately  5.77%. The maximum amount of
reverse repurchase agreements outstanding at any month-end during the six months
ended June 30, 1997 was  $77,962,750 as of March 31, 1997 which was 29% of total
assets. The amount of reverse repurchase agreements outstanding at June 30, 1997
was $62,465,875, which was 22.8% of total assets.

Dollar  Rolls:  The Trust may enter 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 will be compensated by the interest
earned on the cash  proceeds  of the  initial  sale and by the lower  repurchase
price at the future  date.  The Trust did not enter into dollar rolls during the
six months ended June 30, 1997.


Note 5. Capital

There are 200 million shares of $.01 par value common stock authorized. The 1999
Term Trust owned all of the 21,610,583 shares outstanding at June 30, 1997.


                                       10
<PAGE>

- --------------------------------------------------------------------------------
                              BNN SUBSIDIARY, INC.
                             ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

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


                                       11
<PAGE>

- -----------                                       ------------------------------
 BlackRock
- -----------                                       ------------------------------

Directors
Laurence D. Fink, Chairman
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Grosfeld
James Clayburn La Force, Jr.
Walter F. Mondale                                           BNN Subsidiary, Inc.
Ralph L. Schlosstein                                        ====================
                                                            Semi-Annual Report  
Officers                                                    June 30, 1997       
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
Frank Smith, Assistant Treasurer
Karen H. Sabath, Secretary

Investment Adviser
BlackRock Financial Management, Inc.
345 Park Avenue
New York, NY 10154
(800) 227-7BFM

Administrator
Prudential Investments Fund Management LLC
Gateway Center Three
100 Mulberry Street
Newark, NJ 07102-4077

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
919 Third Avenue
New York, NY 10022

     The accompanying financial statements                       
as of June 30, 1997 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.


             BNN Subsidiary, Inc.
c/o Prudential Investments Fund Management LLC
             Gateway Center Three
              100 Mulberry Street
             Newark, NJ 07102-4077
                (800) 227-7BFM

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