MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III
N-30D, 2000-10-04
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<PAGE>   1

MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III
                                                        Two World Trade Center
LETTER TO THE SHAREHOLDERS July 31, 2000                New York, New York 10048

DEAR SHAREHOLDER:

The 6-month period ended July 31, 2000, proved to be an extremely difficult one
for high-yield bond investors, as the high-yield market remained mired in one of
its worst slumps in the past 20 years. Concern over a rapidly growing U.S.
economy and the threat of inflation prompted the Federal Reserve Board to
continue its policy of raising short-term interest rates. As a result of the
Fed's actions and the ensuing higher-interest-rate environment, the financial
markets became worried about a potential hard landing for the U.S. economy and
its effect on future corporate earnings. These fears resulted in an extremely
weak fixed-income market during 1999 and an increasingly volatile equity market
in the first half of 2000. As investors became more risk averse, we witnessed a
severe flight to quality in the fixed-income markets, with the high-yield sector
being hit exceptionally hard. Much as in the last major high-yield market
correction ten years ago, significant investor outflows have greatly exaggerated
the decline, creating an extremely oversold market.

Credit spreads within the fixed-income markets widened dramatically over the
past year and a half as investors came to favor higher-quality securities. As a
result of this flight to quality, the yield spread between high-yield bonds and
comparable U.S. government securities is now approaching its widest margin in
history. Spreads have also broadened between the different tiers within the
high-yield sector as investors have gravitated toward the highest-quality end of
the marketplace. As a result of this trend, lower-yielding, higher-quality
BB-rated bonds have held up significantly better than those in the
higher-yielding, lower-quality B-rated sector. Much as we saw in the high-yield
bear market of 1989 and 1990, investors' reactions have resulted in a sharp
decline in the prices of many high-yield bonds, driving market yields
substantially higher in the process so that yield spreads on many B-rated bonds
are approaching their highest levels on record.
<PAGE>   2
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

LETTER TO THE SHAREHOLDERS July 31, 2000, continued



PERFORMANCE

For the 6-month period ended July 31, 2000, Morgan Stanley Dean Witter High
Income Advantage Trust II produced a total return of -7.64 percent, based on a
change in net asset value (NAV) and reinvestment of distributions totaling $0.33
per share. For the same period, the Trust's total return was 19.11 percent,
based on a change in its market price on the New York Stock Exchange (NYSE) and
reinvestment of distributions.

PORTFOLIO STRATEGY

As discussed, the past year and a half has been one of the most difficult
periods for the high-yield market, particularly the B-rated sector, the market's
largest one. As a result of the substantial weakness in the high-yield market,
we have seen high-yield bond prices decline sharply and yields rise dramatically
over this period. Although the Trust's position in the more defensive,
higher-quality end of the market held up relatively well in the turbulent market
environment, its long-term core position in the B-rated sector was adversely
affected over the past year. With yields on many high-yield issues at or near
10-year highs and currently trading at significant discounts to their stated
maturity value, we currently view the high-yield sector as extremely
undervalued, although the timing of a recovery is still very uncertain at this
point. As the market outlook improves over time, we would expect to see investor
flows turn positive once again, creating strong demand for many of today's
depressed high-yield bonds. In light of our positive long-term outlook based on
historically low valuations, we are maintaining our focus on this sector of the
market, which we believe offers the Trust long-term total return potential.

From an industry perspective we view the telecommunications sector as a
potentially rewarding investment opportunity, given the worldwide movement
toward providing expanded global telecommunications services, including voice,
video and data services over a combination of hardline and wireless networks.
The powerful combination of exciting growth prospects for the industry over the
next few years, along with the likelihood of the formation of strategic
partnerships with other major players, provides a fundamental backdrop for
strong revenue growth, higher profitability and future significant credit
improvement. Included among the Trust's current holdings are a number of telecom
companies that over the past year have either announced important strategic
partnerships or have raised equity capital to fuel future growth and profits.
With the recent high-yield market weakness we have seen many of these telecom
bonds decline sharply in price as investor nervousness spreads to this large but
volatile sector of the market. Despite the recent sector weakness, we view the
longer-



                                       2
<PAGE>   3
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

LETTER TO THE SHAREHOLDERS July 31, 2000, continued



term prospects of this important industry very positively and feel that at
today's currently depressed levels many of these bonds represent outstanding
investment opportunities.

LOOKING AHEAD

In light of today's substantially higher yields, near-record yield spreads over
U.S. government bonds and significantly discounted bond prices, we view the
high-yield market as a potentially rewarding long-term investment opportunity.
Assuming a soft landing in the economy with growth continuing into 2001, we
would expect the high-yield market to recover over time and bond prices to
rebound from their current extremely depressed levels, much as they did in the
early 1990s period following the last high-yield bear market. Although the
B-rated segment of the market has clearly not been a good investment performer
over the past 18 months, we remain confident that its attractive yield and
capital appreciation potential remain intact for long-term investors.

We would like to remind you that the Trustees have approved a procedure whereby
the Trust may, when appropriate, repurchase shares in the open market or in
privately negotiated transactions at a price not above market value or net asset
value, whichever is lowest at the time of purchase.

We appreciate your ongoing support of Morgan Stanley Dean Witter High Income
Advantage Trust III and look forward to continuing to serve your investment
needs.

<TABLE>
<S>                                              <C>
Very truly yours,

/s/ CHARLES A. FIUMEFREDDO                       /s/ MITCHELL M. MERIN
CHARLES A. FIUMEFREDDO                           MITCHELL M. MERIN
Chairman of the Board                            President
</TABLE>



                                       3
<PAGE>   4



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

RESULTS OF ANNUAL MEETING (unaudited)

                             *         *         *

On June 22, 2000, an annual meeting of the Trust's shareholders was held for the
purpose of voting on the following matter, the results of which were as follows:

(1) ELECTION OF TRUSTEES:

<TABLE>
<S>                                                           <C>
Michael Bozic
For.........................................................  10,770,186
Withheld....................................................     212,528

Charles A. Fiumefreddo
For.........................................................  10,772,470
Withheld....................................................     210,244
</TABLE>

  The following Trustees were not standing for reelection at this meeting: Wayne
  E. Hedien, Edwin J. Garn, Dr. Manuel H. Johnson, Michael E. Nugent, Philip J.
  Purcell and John L. Schroeder.



                                      4
<PAGE>   5



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited)

<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                           COUPON    MATURITY
THOUSANDS                                            RATE       DATE         VALUE
-------------------------------------------------------------------------------------
<C>         <S>                                     <C>       <C>         <C>
            CORPORATE BONDS (95.7%)
            Aerospace (0.9%)
$    500    Sabreliner Corp. - 144A*..............  11.00 %   06/15/08    $   413,750
                                                                          -----------

            Beverages - Non-Alcoholic (1.8%)
   1,000    Sparkling Spring Water (Canada).......  11.50     11/15/07        780,000
                                                                          -----------

            Books/Magazines (0.5%)
     250    Perry-Judds, Inc. ....................  10.625    12/15/07        215,000
                                                                          -----------

            Broadcast/Media (0.6%)
     300    Tri-State Outdoor Mediagroup, Inc. ...  11.00     05/15/08        270,000
                                                                          -----------

            Broadcasting (1.0%)
     200    STC Broadcasting, Inc. ...............  11.00     03/15/07        198,000
     250    XM Satellite Radio Inc. - 144A*
             (Units)++............................  14.00     03/15/10        233,750
                                                                          -----------
                                                                              431,750
                                                                          -----------
            Cable Television (0.7%)
   3,750    Australis Holdings Property Ltd.
             (Australia) (a)......................  15.00++   11/01/02         37,500
     500    Knology Holdings, Inc. ...............  11.875++  10/15/07        265,000
                                                                          -----------
                                                                              302,500
                                                                          -----------
            Casino/Gambling (5.6%)
   2,800    Aladdin Gaming Capital Corp. (Series
             B)...................................  13.50++   03/01/10      1,680,000
   1,500    Fitzgeralds Gaming Corp. (Series B)
             (b)..................................  12.25     12/15/04        795,000
                                                                          -----------
                                                                            2,475,000
                                                                          -----------
            Cellular Telephone (1.2%)
     300    Dobson/Sygnet Communications..........  12.25     12/15/08        309,000
     700    Dolphin Telecom PLC (United
             Kingdom).............................  14.00++   05/15/09        231,000
                                                                          -----------
                                                                              540,000
                                                                          -----------
            Construction/Agricultural Equipment/
             Trucks (1.6%)
     750    J.B. Poindexter & Co., Inc. ..........  12.50     05/15/04        708,750
                                                                          -----------

            Consumer Electronics/Appliances (0.7%)
   5,000    International Semi-Tech
             Microelectronics, Inc. (Canada)
             (a)..................................  11.50++   08/15/03         50,000
     250    Windmere-Durable Holdings, Inc. ......  10.00     07/31/08        245,000
                                                                          -----------
                                                                              295,000
                                                                          -----------
            Consumer Specialties (1.9%)
   1,000    Samsonite Corp. ......................  10.75     06/15/08        827,500
                                                                          -----------
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS




                                       5
<PAGE>   6
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited) continued



<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                           COUPON    MATURITY
THOUSANDS                                            RATE       DATE         VALUE
-------------------------------------------------------------------------------------
<C>         <S>                                     <C>       <C>         <C>
            Consumer/Business Services (3.4%)
    $500    Anacomp, Inc. (Series B)..............  10.875%   04/01/04    $   337,500
     250    Anacomp, Inc. (Series D)..............  10.875    04/01/04        168,750
     668    Comforce Corp. (Series B).............  15.00+    12/01/09        200,320
   1,500    Comforce Operating, Inc. .............  12.00     12/01/07        810,000
                                                                          -----------
                                                                            1,516,570
                                                                          -----------
            Containers/Packaging (4.6%)
   1,000    Berry Plastics Corp. .................  12.25     04/15/04        962,500
   1,583    Envirodyne Industries, Inc. ..........  10.25     12/01/01      1,068,525
                                                                          -----------
                                                                            2,031,025
                                                                          -----------
            Diversified Electronic Products (0.8%)
     500    High Voltage Engineering, Inc. .......  10.75     08/15/04        345,000
                                                                          -----------

            Diversified Manufacturing (6.7%)
     600    Eagle-Picher Industries, Inc. ........   9.375    03/01/08        501,000
   3,900    Jordan Industries, Inc. (Series B)....  11.75++   04/01/09      2,496,000
                                                                          -----------
                                                                            2,997,000
                                                                          -----------
            E.D.P. Services (0.9%)
     500    Globix Corp. .........................  12.50     02/01/10        395,000
                                                                          -----------

            Electronic Distributors (0.0%)
   1,000    CHS Electronics, Inc. (a)(b)..........   9.875    04/15/05         20,000
                                                                          -----------

            Environmental Services (1.1%)
     550    Allied Waste North America Inc.
             (Series B)...........................  10.00     08/01/09        479,875
                                                                          -----------

            Food Chains (1.1%)
     260    Eagle Food Centers, Inc. (a)(b).......   8.625    04/15/00        135,200
     750    Pueblo Xtra International, Inc.
             (Series C)...........................   9.50     08/01/03        375,000
                                                                          -----------
                                                                              510,200
                                                                          -----------
            Food Distributors (1.7%)
     500    Fleming Companies, Inc. (Series B)....  10.625    07/31/07        431,250
     350    Volume Services America...............  11.25     03/01/09        320,250
                                                                          -----------
                                                                              751,500
                                                                          -----------
            Hotels/Resorts (1.3%)
     500    Epic Resorts LLC (Series B)...........  13.00     06/15/05        175,000
     600    Resort At Summerlin (Series B)........  13.00     12/15/07        419,717
                                                                          -----------
                                                                              594,717
                                                                          -----------
            Industrial Specialties (2.3%)
     300    Indesco International, Inc. ..........   9.75     04/15/08        114,000
     500    International Wire Group, Inc. .......  11.75     06/01/05        500,000
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS



                                       6
<PAGE>   7
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited) continued



<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                           COUPON    MATURITY
THOUSANDS                                            RATE       DATE         VALUE
-------------------------------------------------------------------------------------
<C>         <S>                                     <C>       <C>         <C>
    $500     Outsourcing Services Group, Inc.
             (Series B)...........................  10.875%   03/01/06    $   400,000
                                                                          -----------
                                                                            1,014,000
                                                                          -----------
            Internet Services (0.9%)
     500    Cybernet Internet Services Inc. ......  14.00     07/01/09        210,000
     250    PSINet, Inc. .........................  10.50     12/01/06        202,500
                                                                          -----------
                                                                              412,500
                                                                          -----------
            Medical Specialties (2.1%)
     900    Mediq/PRN Life Support Services,
             Inc. (b).............................  11.00     06/01/08         45,000
   1,000    Universal Hospital Services, Inc.
             (issued 02/25/98)....................  10.25     03/01/08        580,000
     500    Universal Hospital Services, Inc.
             (issued 01/26/99)....................  10.25     03/01/08        290,000
                                                                          -----------
                                                                              915,000
                                                                          -----------
            Medical/Nursing Services (2.3%)
   1,500    Pediatric Services of America, Inc.
             (Series A)...........................  10.00     04/15/08      1,027,500
                                                                          -----------

            Military/Gov't/Technical (0.5%)
     300    Loral Space & Communications Ltd. ....   9.50     01/15/06        225,000
                                                                          -----------

            Movies/Entertainment (0.4%)
     800    Regal Cinemas Inc. ...................   9.50     06/01/08        160,000
                                                                          -----------

            Office Equipment/Supplies (1.7%)
   1,300    Mosler, Inc. .........................  11.00     04/15/03        780,000
                                                                          -----------

            Oil Refining/Marketing (0.0%)
   1,500    Transamerican Refining Corp. (Series
             B) (a)(b)............................  16.00     06/30/03         18,750
                                                                          -----------

            Other Telecommunications (11.9%)
   1,000    Birch Telecom Inc. ...................  14.00     06/15/08        800,000
     500    DTI Holdings, Inc. (Series B).........  12.50++   03/01/08        195,000
     350    Esprit Telecom Group PLC (United
             Kingdom).............................  11.50     12/15/07        252,000
     500    Esprit Telecom Group PLC (United
             Kingdom).............................  10.875    06/15/08        335,000
   1,800    Firstworld Communications, Inc. ......  13.00++   04/15/08        558,000
     300    Globenet Comm Group Ltd. (Bermuda)....  13.00     07/15/07        304,500
     300    Pac-West Telecomm Inc. ...............  13.50     02/01/09        303,000
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS




                                       7
<PAGE>   8
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited) continued



<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                           COUPON    MATURITY
THOUSANDS                                            RATE       DATE         VALUE
-------------------------------------------------------------------------------------
<C>         <S>                                     <C>       <C>         <C>
$    500    Primus Telecommunication Group, Inc.
             (Series B)...........................   9.875%   05/15/08    $   275,000
     200    Primus Telecommunications Group,
             Inc. ................................  12.75     10/15/09        122,000
     250    Versatel Telecom International NV
             (Netherlands)........................  13.25     05/15/08        256,250
     700    Viatel, Inc. .........................  11.25     04/15/08        434,000
     250    Viatel, Inc. (issued 03/19/99)........  11.50     03/15/09        155,000
     300    Viatel, Inc. (issued 12/08/99)........  11.50     03/15/09        186,000
   1,000    World Access, Inc. (c)................  13.25     01/15/08        889,999
     250    Worldwide Fiber Inc. (Canada).........  12.00     08/01/09        232,500
                                                                          -----------
                                                                            5,298,249
                                                                          -----------
            Package Goods/Cosmetics (1.8%)
     806    J.B. Williams Holdings, Inc. .........  12.00     03/01/04        797,940
                                                                          -----------

            Printing/Forms (0.1%)
     500    Premier Graphics Inc. (b).............  11.50     12/01/05         35,000
                                                                          -----------

            Restaurants (5.8%)
   6,251    American Restaurant Group Holdings,
             Inc. - 144A* (c).....................   0.00     12/15/05      1,781,450
   1,500    FRD Acquisition Corp. (Series B)......  12.50     07/15/04        555,000
     300    Friendly Ice Cream Corp. .............  10.50     12/01/07        249,750
                                                                          -----------
                                                                            2,586,200
                                                                          -----------
            Retail - Specialty (1.1%)
     300    Pantry, Inc. .........................  10.25     10/15/07        289,500
     250    Petro Stopping Centers L.P. ..........  10.50     02/01/07        223,750
                                                                          -----------
                                                                              513,250
                                                                          -----------
            Specialty Foods/Candy (2.6%)
   8,322    SFAC New Holdings Inc. (c)............  13.00++   06/15/09      1,165,057
                                                                          -----------

            Telecommunications (12.3%)
     250    Caprock Communications Corp. .........  11.50     05/01/09        182,500
     300    Caprock Communications Corp.
             (Series B)...........................  12.00     07/15/08        225,000
     250    Covad Communications Group, Inc. .....  12.50     02/15/09        190,000
     300    Covad Communications Group, Inc.
             (Series B)...........................  12.00     02/15/10        222,000
   1,300    e. Spire Communications, Inc. ........  13.75     07/15/07        845,000
     500    Focal Communications Corp. (Series
             B)...................................  12.125++  02/15/08        337,500
     300    GST Equipment Funding, Inc. (a).......  13.25     05/01/07        157,500
     250    Hyperion Telecommunication, Inc.
             (Series B)...........................  12.25     09/01/04        245,000
     450    Level 3 Communications, Inc. .........   9.125    05/01/08        389,250
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS




                                       8
<PAGE>   9
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited) continued



<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                           COUPON    MATURITY
THOUSANDS                                            RATE       DATE         VALUE
-------------------------------------------------------------------------------------
<C>         <S>                                     <C>       <C>         <C>
$    250    MGC Communications, Inc. - 144A*......  13.00 %   04/01/10    $   232,500
     500    Nextlink Communications LLC...........  12.50     04/15/06        515,000
   8,750    Normex Technologies Corp. (Series B)
             (a)(b)...............................  14.00     05/15/02        700,000
     900    Rhythms Netconnections, Inc. .........  12.75     04/15/09        594,000
     250    Startec Global Communications
             Corp. ...............................  12.00     05/15/08        200,000
     500    Talton Holdings, Inc. (Series B)......  11.00     06/30/07        425,000
                                                                          -----------
                                                                            5,460,250
                                                                          -----------
            Wireless Communications (11.8%)
   2,000    Advanced Radio Telecom Corp. .........  14.00     02/15/07      1,759,999
     500    AMSC Acquisition Co., Inc. (Series
             B)...................................  12.25     04/01/08        372,500
     200    Arch Escrow Corp. ....................  13.75     04/15/08        160,000
   4,000    CellNet Data Systems, Inc. (a)........  14.00++   10/01/07        280,000
     500    Globalstar LP/Capital Corp. ..........  10.75     11/01/04        135,000
     600    Orbcomm Global LP/Capital Corp.
             (Series B)...........................  14.00     08/15/04        210,000
   1,000    Paging Network, Inc. (b)..............  10.125    08/01/07        400,000
   1,500    Paging Network, Inc. (b)..............  10.00     10/15/08        600,000
   1,000    USA Mobile Communications Holdings,
             Inc. ................................  14.00     11/01/04        860,000
     500    Winstar Communications,
             Inc. - 144A*.........................  12.75     04/15/10        465,000
                                                                          -----------
                                                                            5,242,499
                                                                          -----------
            TOTAL CORPORATE BONDS
             (Cost $70,488,151)........................................    42,551,332
                                                                          -----------
<CAPTION>
NUMBER OF
 SHARES
---------
<C>         <S>
            COMMON STOCKS (d)(0.6%)
            Clothing/Shoe/Accessory Stores (0.0%)
 551,830    County Seat Stores, Inc. (c)...............................         4,966
                                                                          -----------

            Hotels/Resorts (0.0%)
   2,000    Motels of America, Inc. - 144A*............................           500
                                                                          -----------

            Medical/Nursing Services (0.0%)
 104,665    Raintree Healthcare Corp. (c)..............................           942
                                                                          -----------

            Other Telecommunications (0.5%)
   6,667    Versatel Telecom International NV (ADR) Netherlands........       213,344
   3,142    World Access, Inc. (c).....................................        28,278
                                                                          -----------
                                                                              241,622
                                                                          -----------
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS



                                       9
<PAGE>   10
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited) continued



<TABLE>
<CAPTION>
NUMBER OF
 SHARES                                                                      VALUE
-------------------------------------------------------------------------------------
<C>         <S>                                     <C>       <C>         <C>
            Restaurants (0.0%)
   4,750    American Restaurant Group Holdings, Inc. - 144A*...........   $     1,188
                                                                          -----------

            Specialty Foods/Candy (0.1%)
     453    SFAC New Holdings Inc. (c).................................           113
  90,000    Specialty Foods Acquisition Corp. - 144A*..................        22,500
                                                                          -----------
                                                                               22,613
                                                                          -----------
            Telecommunication Equipment (0.0%)
  41,066    FWT, Inc. (Class A) (c)....................................           411
                                                                          -----------

            Textiles (0.0%)
 112,296    United States Leather, Inc. (c)............................         1,123
                                                                          -----------

            TOTAL COMMON STOCKS
             (Cost $6,404,795).........................................       273,365
                                                                          -----------

            PREFERRED STOCKS (0.5%)
            Oil Refining/Marketing (0.0%)
   2,633    Transamerica Refining Corp. (Conv.) (Class B)*.............            26
   1,448    Transamerica Refining Corp. (Conv.) (Class C)*.............            14
   3,818    Transamerica Refining Corp. (Conv.) (Class D)*.............            38
   7,899    Transamerica Refining Corp. (Conv.) (Class E)*.............            80
                                                                          -----------
                                                                                  158
                                                                          -----------
            Telecommunication Equipment (0.5%)
 410,666    FWT, Inc. (Series A) (c)...................................       205,333
                                                                          -----------

            TOTAL PREFERRED STOCKS
             (Cost $1,647,295).........................................       205,491
                                                                          -----------
</TABLE>

<TABLE>
<CAPTION>
NUMBER OF                                                    EXPIRATION
WARRANTS                                                        DATE
---------                                                    ----------
<C>         <S>                                              <C>          <C>
            WARRANTS (d) (0.3%)
            Aerospace (0.1%)
   2,500    Sabreliner Corp. - 144A*.......................   04/15/03         25,000
                                                                          -----------

            Casino/Gambling (0.0%)
  23,000    Aladdin Gaming Enterprises, Inc. - 144A*.......   03/01/10            230
                                                                          -----------
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS





                                       10
<PAGE>   11
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited) continued



<TABLE>
<CAPTION>
NUMBER OF                                                    EXPIRATION
WARRANTS                                                        DATE         VALUE
-------------------------------------------------------------------------------------
<C>         <S>                                              <C>          <C>
            Hotels/Resorts (0.0%)
     500    Epic Resorts LLC - 144A*.......................   06/15/05    $         5
     500    Resort At Summerlin - 144A*....................   12/15/07              5
                                                                          -----------
                                                                                   10
                                                                          -----------
            Internet Services (0.0%)
     500    Cybernet Internet Services Inc. - 144A*........   07/01/09          5,000
                                                                          -----------

            Oil Refining/Marketing (0.0%)
   1,500    Transamerican Refining Corp. - 144A*...........   06/30/03              2
                                                                          -----------

            Other Telecommunications (0.2%)
   1,000    Birch Telecom Inc. - 144A*.....................   06/15/08         55,000
   2,500    DTI Holdings Inc. - 144A*......................   03/01/08             25
   1,800    Firstworld Communications, Inc. - 144A*........   04/15/08         36,000
                                                                          -----------
                                                                               91,025
                                                                          -----------
            Telecommunications (0.0%)
     250    Startec Global Communications Corp. - 144A*....   05/15/08            875
                                                                          -----------

            Wireless Communications (0.0%)
     500    Motient Corp. - 144A*..........................   04/01/08         20,000
                                                                          -----------

            TOTAL WARRANTS
            (Cost $244,674)............................................       142,142
                                                                          -----------
</TABLE>

<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                           COUPON    MATURITY
THOUSANDS                                            RATE       DATE
---------                                           -------   ---------
<C>         <S>                                     <C>       <C>         <C>
            SHORT-TERM INVESTMENT (0.3%)
            REPURCHASE AGREEMENT
 $   124    The Bank of New York
            (dated 07/31/00; proceeds $123,577)
            (e)(Cost $123,555).....................     6.50%  08/01/00       123,555
                                                                          -----------

            TOTAL INVESTMENTS
            (Cost $78,908,470) (f)............................    97.4%    43,295,885


            OTHER ASSETS IN EXCESS OF LIABILITIES.............      2.6     1,155,760
                                                                 -----    -----------

            NET ASSETS........................................   100.0%   $44,451,645
                                                                 =====    ===========

</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS




                                       11
<PAGE>   12
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

PORTFOLIO OF INVESTMENTS July 31, 2000 (unaudited) continued



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

<TABLE>
<C>  <S>
ADR  American Depository Receipt.
 *   Resale is restricted to qualified institutional investors.
++   Consists of one or more class of securities traded together
     as a unit; stocks or bonds with attached warrants.
 +   Payment-in-kind security.
++   Currently a zero coupon bond and will pay interest at the
     rate shown at a future specified date.
(a)  Issuer in bankruptcy.
(b)  Non-income producing security; bond in default.
(c)  Acquired through exchange offer.
(d)  Non-income producing securities.
(e)  Collateralized by $124,250 U.S. Treasury Note 5.875% due
     02/15/04 valued at $126,026.
(f)  The aggregate cost for federal income tax purposes
     approximates the aggregate cost for book purposes. The
     aggregate gross unrealized appreciation is $661,370 and the
     aggregate gross unrealized depreciation is $36,273,955,
     resulting in net unrealized depreciation of $35,612,585.
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS




                                       12
<PAGE>   13



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

FINANCIAL STATEMENTS

<TABLE>
<S>                                                           <C>
STATEMENT OF ASSETS AND LIABILITIES
July 31, 2000 (unaudited)
ASSETS:
Investments in securities, at value
 (cost $78,908,470).........................................  $43,295,885
Interest receivable.........................................    1,214,505
Prepaid expenses and other assets...........................       14,563
                                                              -----------

    TOTAL ASSETS............................................   44,524,953
                                                              -----------

LIABILITIES:
Investment management fee payable...........................       29,014
Accrued expenses and other payables.........................       44,294
                                                              -----------

    TOTAL LIABILITIES.......................................       73,308
                                                              -----------

    NET ASSETS..............................................  $44,451,645
                                                              ===========

COMPOSITION OF NET ASSETS:
Paid-in-capital.............................................  $111,277,286
Net unrealized depreciation.................................  (35,612,585)
Accumulated undistributed net investment income.............      254,832
Accumulated net realized loss...............................  (31,467,888)
                                                              -----------

    NET ASSETS..............................................  $44,451,645
                                                              ===========

NET ASSET VALUE PER SHARE,
 12,837,779 shares outstanding
 (unlimited shares authorized of $.01 par value)............        $3.46
                                                              ===========
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS




                                       13
<PAGE>   14



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

FINANCIAL STATEMENTS, continued

<TABLE>
<S>                                                           <C>
STATEMENT OF OPERATIONS
For the six months ended July 31, 2000 (unaudited)
NET INVESTMENT INCOME:
INTEREST INCOME.............................................  $ 4,227,335
                                                              -----------

EXPENSES
Investment management fee...................................      182,647
Professional fees...........................................       34,255
Transfer agent fees and expenses............................       18,647
Shareholder reports and notices.............................       15,074
Registration fees...........................................       12,436
Trustees' fees and expenses.................................        6,040
Custodian fees..............................................        2,034
Other.......................................................        6,496
                                                              -----------

    TOTAL EXPENSES..........................................      277,629
                                                              -----------

    NET INVESTMENT INCOME...................................    3,949,706
                                                              -----------

NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized gain...........................................      252,683
Net change in unrealized depreciation.......................   (7,383,712)
                                                              -----------

    NET LOSS................................................   (7,131,029)
                                                              -----------

NET DECREASE................................................  $(3,181,323)
                                                              ===========
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS



                                       14
<PAGE>   15



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

FINANCIAL STATEMENTS, continued

<TABLE>
<CAPTION>
STATEMENT OF CHANGES IN NET ASSETS
                                                        FOR THE SIX
                                                        MONTHS ENDED    FOR THE YEAR
                                                         JULY 31,          ENDED
                                                           2000        JANUARY 31, 2000
---------------------------------------------------------------------------------------
                                                        (unaudited)
<S>                                                     <C>            <C>
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment income.................................  $ 3,949,706      $  8,555,182
Net realized gain (loss)..............................      252,683        (1,211,052)
Net change in unrealized depreciation.................   (7,383,712)      (11,007,329)
                                                        -----------      ------------

    NET DECREASE......................................   (3,181,323)       (3,663,199)

Dividends to shareholders from net investment
 income...............................................   (4,236,418)       (9,012,471)
Decrease from transactions in shares of beneficial
 interest.............................................           --          (151,345)
                                                        -----------      ------------

    NET DECREASE......................................   (7,417,741)      (12,827,015)
NET ASSETS:
Beginning of period...................................   51,869,386        64,696,401
                                                        -----------      ------------

    END OF PERIOD
    (Including undistributed net investment income of
    $254,832 and $541,544, respectively)..............  $44,451,645      $ 51,869,386
                                                        ===========      ============
</TABLE>

        SEE NOTES TO FINANCIAL STATEMENTS



                                       15
<PAGE>   16



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

NOTES TO FINANCIAL STATEMENTS July 31, 2000 (unaudited)

1. ORGANIZATION AND ACCOUNTING POLICIES

Morgan Stanley Dean Witter High Income Advantage Trust III (the "Trust") is
registered under the Investment Company Act of 1940, as amended, as a
diversified, closed-end management investment company. The Trust's primary
investment objective is to earn a high level of current income and, as a
secondary objective, capital appreciation, but only when consistent with its
primary objective. The Trust seeks to achieve its objective by investing
primarily in lower-rated fixed income securities. The Trust was organized as a
Massachusetts business trust on November 23, 1988 and commenced operations on
February 28, 1989.

The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual results could differ from
those estimates.

The following is a summary of significant accounting policies:

A. VALUATION OF INVESTMENTS -- (1) an equity security listed or traded on the
New York or American Stock Exchange, NASDAQ, or other exchange is valued at its
latest sale price, prior to the time when assets are valued; if there were no
sales that day, the security is valued at the latest bid price (in cases where
securities are traded on more than one exchange; the securities are valued on
the exchange designated as the primary market pursuant to procedures adopted by
the Trustees); (2) all other portfolio securities for which over-the-counter
market quotations are readily available are valued at the latest available bid
price; (3) when market quotations are not readily available, including
circumstances under which it is determined by Morgan Stanley Dean Witter
Advisors Inc. (the "Investment Manager") that sale or bid prices are not
reflective of a security's market value, portfolio securities are valued at
their fair value as determined in good faith under procedures established by and
under the general supervision of the Trustees; (4) certain of the Trust's
portfolio securities may be valued by an outside pricing service approved by the
Trustees. The pricing service may utilize a matrix system incorporating security
quality, maturity and coupon as the evaluation model parameters, and/or research
and evaluations by its staff, including review of broker-dealer market price
quotations, if available, in determining what it believes is the fair valuation
of the portfolio securities valued by such pricing service; and (5) short-term
debt securities having a maturity date of more than sixty days at time of
purchase are valued on a mark-to-market basis until sixty days prior to maturity
and thereafter at amortized cost based on their value on the 61st day.
Short-term debt securities having a maturity date of sixty days or less at the
time of purchase are valued at amortized cost.




                                       16
<PAGE>   17
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

NOTES TO FINANCIAL STATEMENTS July 31, 2000 (unaudited) continued



B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on the
trade date (date the order to buy or sell is executed). Realized gains and
losses on security transactions are determined by the identified cost method.
Discounts are accreted over the life of the respective securities. Interest
income is accrued daily except where collection is not expected.

C. FEDERAL INCOME TAX STATUS -- It is the Trust's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute all of its taxable income to its shareholders.
Accordingly, no federal income tax provision is required.

D. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Trust records dividends
and distributions to its shareholders on the record date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and
distributions which exceed net investment income and net realized capital gains
for financial reporting purposes but not for tax purposes are reported as
dividends in excess of net investment income or distributions in excess of net
realized capital gains. To the extent they exceed net investment income and net
realized capital gains for tax purposes, they are reported as distributions of
paid-in-capital.

2. INVESTMENT MANAGEMENT AGREEMENT

Pursuant to an Investment Management Agreement with the Investment Manager, the
Trust pays the Investment Manager a management fee, calculated weekly and
payable monthly, by applying the following annual rates to the Trust's weekly
net assets: 0.75% to the portion of weekly net assets not exceeding $250
million; 0.60% to the portion of weekly net assets exceeding $250 million but
not exceeding $500 million; 0.50% to the portion of weekly net assets exceeding
$500 million but not exceeding $750 million; 0.40% to the portion of weekly net
assets exceeding $750 million but not exceeding $1 billion; and 0.30% to the
portion of weekly net assets exceeding $1 billion.

3. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES

The cost of purchases and proceeds from sales of portfolio securities, excluding
short-term investments, for the six months ended July 31, 2000 aggregated
$4,358,625 and $6,516,792, respectively.




                                       17
<PAGE>   18
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

NOTES TO FINANCIAL STATEMENTS July 31, 2000 (unaudited) continued



Morgan Stanley Dean Witter Trust FSB, an affiliate of the Investment Manager, is
the Trust's transfer agent. At July 31, 2000, the Trust had transfer agent fees
and expenses payable of approximately $4,000.

4. SHARES OF BENEFICIAL INTEREST

<TABLE>
<CAPTION>
                                                                                         CAPITAL
                                                                                         PAID IN
                                                                           PAR VALUE    EXCESS OF
                                                                SHARES     OF SHARES    PAR VALUE
                                                              ----------   ---------   ------------
<S>                                                           <C>          <C>         <C>
Balance, January 31, 1999...................................  12,876,779   $128,768    $120,947,519
Treasury shares purchased and retired (weighted average
 discount 4.39%)*...........................................     (39,000)      (390)       (150,955)
Reclassification due to permanent book/tax differences......          --         --      (9,647,656)
                                                              ----------   --------    ------------
Balance, January 31, 2000 and July 31, 2000.................  12,837,779   $128,378    $111,148,908
                                                              ==========   ========    ============
</TABLE>

---------------------
* The Trustees have voted to retire the shares purchased.

5. DIVIDENDS

The Trust declared the following dividends from net investment income:

<TABLE>
<CAPTION>
   DECLARATION       AMOUNT          RECORD             PAYABLE
       DATE         PER SHARE         DATE                DATE
------------------  ---------   -----------------  ------------------
<S>                 <C>         <C>                <C>
  July 25, 2000      $0.055      August 4, 2000     August 18, 2000
 August 29, 2000     $0.055     September 8, 2000  September 22, 2000
</TABLE>

6. FEDERAL INCOME TAX STATUS

At January 31, 2000, the Trust had a net capital loss carryover of approximately
$30,596,000 which may be used to offset future capital gains to the extent
provided by regulations which is available through January 31 of the following
years:

<TABLE>
<CAPTION>
                                  AMOUNT IN THOUSANDS
---------------------------------------------------------------------------------------
        2002              2003       2004       2005       2006       2007       2008
---------------------   --------   --------   --------   --------   --------   --------
<S>                     <C>        <C>        <C>        <C>        <C>        <C>
       $3,256           $10,665     $4,258     $3,007     $5,910     $1,633     $1,867
       ======           =======     ======     ======     ======     ======     ======
</TABLE>



                                       18
<PAGE>   19
MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

NOTES TO FINANCIAL STATEMENTS July 31, 2000 (unaudited) continued



Capital losses incurred after October 31 ("post-October" losses) within the
taxable year are deemed to arise on the first business day of the Trust's next
taxable year. The Trust incurred and will elect to defer net capital losses of
approximately $7,000 during fiscal 2000.

At January 31, 2000, the Trust had temporary book/tax differences primarily
attributable to post-October losses, capital loss deferrals on wash sales and
interest on bonds in default.





                                       19
<PAGE>   20



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

FINANCIAL HIGHLIGHTS

Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:

<TABLE>
<CAPTION>
                                                        FOR THE SIX                  FOR THE YEAR ENDED JANUARY 31,
                                                       MONTHS ENDED       ----------------------------------------------------
                                                       JULY 31, 2000        2000       1999       1998       1997       1996
------------------------------------------------------------------------------------------------------------------------------
                                                        (unaudited)
<S>                                                 <C>                   <C>        <C>        <C>        <C>        <C>
SELECTED PER SHARE DATA:

Net asset value, beginning of period..............         $ 4.04           $ 5.02     $ 6.18     $ 6.11     $ 6.39     $ 6.12
                                                           ------           ------     ------     ------     ------     ------

Income (loss) from investment operations:
 Net investment income............................           0.31             0.66       0.72       0.78       0.77       0.75
 Net realized and unrealized gain (loss)..........          (0.56)           (0.94)     (1.16)      0.05      (0.26)      0.24
                                                           ------           ------     ------     ------     ------     ------

Total income (loss) from investment operations....          (0.25)           (0.28)     (0.44)      0.83       0.51       0.99
                                                           ------           ------     ------     ------     ------     ------

Less dividends from net investment income.........          (0.33)           (0.70)     (0.72)     (0.76)     (0.79)     (0.72)
                                                           ------           ------     ------     ------     ------     ------

Net asset value, end of period....................         $ 3.46           $ 4.04     $ 5.02     $ 6.18     $ 6.11     $ 6.39
                                                           ======           ======     ======     ======     ======     ======

Market value, end of period.......................         $4.625           $4.188     $5.938     $7.375     $ 7.00     $ 6.75
                                                           ======           ======     ======     ======     ======     ======

TOTAL RETURN+.....................................          19.11%(1)       (19.47)%   (10.59)%    16.86%     16.03%     15.31%

RATIOS TO AVERAGE NET ASSETS:
Expenses..........................................           1.16%(2)         1.08%      1.05%      0.96%      0.98%      1.00%

Net investment income.............................          16.47%(2)        14.78%     12.61%     12.70%     12.13%     11.80%

SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...........        $44,452          $51,869    $64,696    $79,572    $78,707    $82,277

Portfolio turnover rate...........................              9%(1)           40%        81%       113%       161%        78%
</TABLE>

---------------------
 +  Total return is based upon the current market value on the last day of each
    period reported Dividends are assumed to be reinvested at the prices
    obtained under the Trust's dividend reinvestment plan. Total return does not
    reflect brokerage commissions.
(1) Not annualized.
(2) Annualized.

                          SEE NOTES TO FINANCIAL STATEMENTS




                                       20
<PAGE>   21



MORGAN STANLEY DEAN WITTER HIGH INCOME ADVANTAGE TRUST III

CHANGE IN INDEPENDENT ACCOUNTANTS

On July 1, 2000 PricewaterhouseCoopers LLP resigned as independent accountants
of the Trust.

The reports of PricewaterhouseCoopers LLP on the financial statements of the
Trust for the past two fiscal years contained no adverse opinion or disclaimer
of opinion and were not qualified or modified as to uncertainty, audit scope or
accounting principle.

In connection with its audits for the two most recent fiscal years and through
July 1, 2000, there have been no disagreements with PricewaterhouseCoopers LLP
on any matter of accounting principles or practices, financial statement
disclosure, or auditing scope or procedure, which disagreements if not resolved
to the satisfaction of PricewaterhouseCoopers LLP would have caused them to make
reference thereto in their report on the financial statements for such years.

The Trust, with the approval of its Board of Trustees and its Audit Committee,
engaged Deloitte & Touche LLP as its new independent accountants as of July 1,
2000.




                                       21
<PAGE>   22

                      (This Page Intentionally Left Blank)
<PAGE>   23

                      (This Page Intentionally Left Blank)
<PAGE>   24

TRUSTEES
----------------------------------
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
Wayne E. Hedien
James F. Higgins
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder

OFFICERS
----------------------------------
Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Mitchell M. Merin
President

Barry Fink
Vice President, Secretary and General Counsel

Peter Avelar
Vice President

Thomas F. Caloia
Treasurer

TRANSFER AGENT
----------------------------------
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center -- Plaza Two
Jersey City, New Jersey 07311

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

INVESTMENT MANAGER
----------------------------------
Morgan Stanley Dean Witter Advisors Inc.
Two World Trade Center
New York, New York 10048

The financial statements included herein have been taken from the records of the
Trust without examination by the independent accountants and accordingly they do
not express an opinion thereon.


MORGAN STANLEY
DEAN WITTER
HIGH INCOME
ADVANTAGE
TRUST III



Semiannual Report
July 31, 2000



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