AMERICAN CENTURY TARGET MATURITIES TRUST
N-30D, 1998-05-26
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                                  SEMIANNUAL
                                    REPORT

                         [american century logo(reg.sm)]
                                    American
                                 Century(reg.tm)


                                MARCH 31, 1998

                                    BENHAM
                                     GROUP

                         Target Maturities Trust: 2000
                         Target Maturities Trust: 2005
                         Target Maturities Trust: 2010
                         Target Maturities Trust: 2015
                         Target Maturities Trust: 2020
                         Target Maturities Trust: 2025

                               TABLE OF CONTENTS
Our Message to You ........................................................    1
Report Highlights .........................................................    2
Market Perspective ........................................................    4
Target Maturities Trust: 2000
           Performance & Portfolio Information ............................    5
           Management Q & A ...............................................    6
           Schedule of Investments ........................................    8
           Financial Highlights ...........................................   36
Target Maturities Trust: 2005
           Performance & Portfolio Information ............................    9
           Management Q & A ...............................................   10
           Schedule of Investments ........................................   12
           Financial Highlights ...........................................   37
Target Maturities Trust: 2010
           Performance & Portfolio Information ............................   13
           Management Q & A ...............................................   14
           Schedule of Investments ........................................   16
           Financial Highlights ...........................................   38
Target Maturities Trust: 2015
           Performance & Portfolio Information ............................   17
           Management Q & A ...............................................   18
           Schedule of Investments ........................................   20
           Financial Highlights ...........................................   39
Target Maturities Trust: 2020
           Performance & Portfolio Information ............................   21
           Management Q & A ...............................................   22
           Schedule of Investments ........................................   24
           Financial Highlights ...........................................   40
Target Maturities Trust: 2025
           Performance & Portfolio Information ............................   25
           Management Q & A ...............................................   26
           Schedule of Investments ........................................   28
           Financial Highlights ...........................................   41
Statements of Assets and Liabilities ......................................   29
Statements of Operations ..................................................   30
Statements of Changes in Net Assets .......................................   31
Notes to Financial Statements .............................................   33
Retirement Account Information ............................................   42
Background Information ....................................................   44
Glossary ..................................................................   45

       American Century  Investments  offers you nearly 70 fund choices covering
stocks,  bonds,  money markets,  specialty  investments and blended  portfolios.
We've organized our funds into three distinct groups,  based on investment style
and objectives, to help simplify your fund decisions. These groups appear below.

                 AMERICAN CENTURY INVESTMENTS--FAMILY OF FUNDS
- -------------------------------------------------------------------------------
        Benham                American Century          Twentieth Century
         Group                     Group                      Group
- -------------------------------------------------------------------------------
   MONEY MARKET FUNDS         ASSET ALLOCATION &           GROWTH FUNDS
 GOVERNMENT BOND FUNDS          BALANCED FUNDS          INTERNATIONAL FUNDS
 DIVERSIFIED BOND FUNDS   CONSERVATIVE EQUITY FUNDS
  MUNICIPAL BOND FUNDS         SPECIALTY FUNDS
- -------------------------------------------------------------------------------
    Target Maturities
        Trust

We welcome your comments or questions about this report.  See the back cover for
ways to contact us by mail, phone or e-mail.

American  Century and Benham  Group are  registered  marks of  American  Century
Services Corporation.


                          AMERICAN CENTURY INVESTMENTS


                              OUR MESSAGE TO YOU

           [photo of James E. Stowers, Jr. and James E. Stowers III]

    The U.S. Treasury market rallied during the six-month period ended March 31,
1998. Low inflation,  an improving federal budget and healthy economy created an
ideal  environment  for bonds.  The financial  crisis in Asia boosted demand for
Treasurys as global investors looked for a safe place to put their money.

    Zero-coupon  bonds,  which are  considerably  more  sensitive  to changes in
interest rates than traditional Treasurys,  produced handsome returns during the
six-month period. Rapidly falling interest rates helped longer-maturity zeros to
post double-digit gains.

    The past six months have been eventful for American Century.  As many of you
may know, we gained a powerful  business  partner this past  January,  when J.P.
Morgan  became a  substantial  minority  shareholder.  J.P.  Morgan  has been in
business over 150 years, serving institutions,  governments and individuals with
complex financial needs. The new business  partnership will allow both companies
to offer investors a highly diverse menu of options and services.

    Many of you may also know that Jim  Benham,  founder  of the  Benham  Group,
retired  in  December.  With the  integration  of Benham and  Twentieth  Century
successfully  completed,  Jim felt it was time to step back  from the  business.
Much of the Benham culture has become a part of American Century,  including the
educational investor seminar program Jim created. Two of his sons, Jim A. Benham
and Tim Benham, remain with the company to carry on the Benham tradition.

    We're also working hard to prepare our computer systems for year 2000 (Y2K),
which has been  widely  publicized  in the  financial  press.  Y2K refers to the
possible inability of computer systems to distinguish between the years 1900 and
2000. Like other financial companies,  a significant  percentage of our computer
operations  involves some type of date comparison or date calculation.  Although
much of our system is already Y2K  compliant,  we anticipate the rest will be in
compliance by the end of this year.

    In  closing,  we are  proud to note that  1998  marks  the 40th  year  since
American  Century  launched its first mutual funds.  Not many fund companies can
claim a 40-year  track record,  or a fund family that includes  nearly 70 stock,
bond,  money market and blended  (stock and bond) funds that  provide  investors
with such a wide range of choice and flexibility. Whatever your financial goals,
we believe we have an outstanding group of funds to help you reach them.

    Thank you for your investment with American Century.

Sincerely,

/s/James E. Stowers, Jr.                     /s/James E. Stowers III
James E. Stowers, Jr.                        James E. Stowers III
Chairman of the Board and Founder            Chief Executive Officer


SEMIANNUAL REPORT                                OUR MESSAGE TO YOU       1


                               REPORT HIGHLIGHTS

MARKET PERSPECTIVE

*   Zero-coupon  Treasury  bonds  produced  excellent  returns in the six months
    ended March 31, 1998, when interest rates declined sharply.

*   Interest rates fell in part because inflation was low--consumer  prices rose
    at the slowest pace in a dozen years in 1997.

*   While inflation was dormant,  the economy surged ahead by 3.7% in the fourth
    quarter of 1997 and by 4.2% in the first three months of 1998.

*   Economic turmoil in Asia spurred demand for U.S. Treasury securities, which
    are considered "safe-haven" investments.

*   Demand for  Treasurys was also helped by the strong U.S.  dollar,  high real
    yields  (nominal  interest  rates minus the current rate of inflation) and a
    healthy economy.

TARGET MATURITIES TRUST: 2000

*   The fund  returned  3.47% for the six months (see the Total Returns table on
    page 5). Target:  2000's positive returns are a result of the recent decline
    in interest rates.

*   The fund's  anticipated  value at  maturity  (AVM) rose by $0.36  because we
    lowered the  assumption  for expenses in our AVM  calculation to reflect the
    new, unified fee structure.

*   We sold some STRIPS  (defined on page 45) and bought the principal  piece of
    an old  Treasury  bond with a yield to maturity  that was 0.20%  higher than
    STRIPS yields.

*   Going forward,  we'll continue to keep the portfolio's average maturity date
    close to the November 15, 2000 maturity of the benchmark.

TARGET MATURITIES TRUST: 2005

*   For the six months, the fund produced a total return of 6.18% (see the Total
    Returns table on page 9), reflecting the recent decline in interest rates.

*   The fund's  anticipated  value at  maturity  (AVM) rose by $0.98  because we
    lowered the  assumption  for expenses in our AVM  calculation to reflect the
    new, unified fee structure.

*   We used new money  coming  into the fund to buy STRIPS  maturing in February
    2006.  Those  securities have a higher yield than  2005-maturity  STRIPS and
    also helped boost Target: 2005's AVM.

*   Going forward, we'll continue to keep the fund's average maturity date close
    to the November 15, 2005 maturity of the benchmark.

TARGET MATURITIES TRUST: 2010

*   For the six months, the fund produced a total return of 8.79% (see the Total
    Returns table on page 13), reflecting the recent decline in interest rates.

*   The fund's  anticipated  value at  maturity  (AVM) rose by $1.28  because we
    lowered the  assumption  for expenses in our AVM  calculation to reflect the
    new, unified fee structure.


                TARGET: 2000

TOTAL RETURNS:                AS OF 3/31/98
     6 Months                        3.47%*
     1 Year                           9.16%

NET ASSETS:                  $239.9 million
     (AS OF 3/31/98)

INCEPTION DATE:                     3/25/85

TICKER SYMBOL:                        BTMTX


                TARGET: 2005

TOTAL RETURNS:                AS OF 3/31/98
     6 Months                        6.18%*
     1 Year                          17.05%

NET ASSETS:                  $406.4 million
     (AS OF 3/31/98)

INCEPTION DATE:                     3/25/85

TICKER SYMBOL:                        BTFIX


                TARGET: 2010

TOTAL RETURNS:                AS OF 3/31/98
     6 Months                        8.79%*
     1 Year                          24.23%

NET ASSETS:                  $183.6 million
     (AS OF 3/31/98)

INCEPTION DATE:                     3/25/85

TICKER SYMBOL:                        BTTNX

* Not annualized.


2      REPORT HIGHLIGHTS                      AMERICAN CENTURY INVESTMENTS


                               REPORT HIGHLIGHTS

*   We used new money  coming into the fund to buy November  2010 STRIPS,  which
    helped lengthen the average maturity date from October 3 to October 7, 2010.

*   Going forward,  we'll work to get the fund's average maturity date closer to
    the November 15, 2010 maturity of the benchmark.

TARGET MATURITIES TRUST: 2015

*   The fund returned  12.34% for the six months (see the Total Returns table on
    page 17).  Those  healthy  returns  are a result of the  recent  decline  in
    interest rates and the fund's high degree of sensitivity to rate changes.

*   Target: 2015's anticipated value at maturity (AVM) rose by $1.97 because we
    lowered the assumption for expenses in our AVM calculation to reflect the
    new, unified fee structure.

*   We used new money  coming into the fund to buy November  2015 STRIPS,  which
    helped  keep the  fund's  average  maturity  date very  close to that of the
    benchmark.

*   Going forward,  we'll continue to track the benchmark to help the fund reach
    its AVM.

TARGET MATURITIES TRUST: 2020

*   For the six months, the fund returned 15.27% (see the Total Returns table on
    page 21). Those returns reflect the recent decline in interest rates and the
    fund's extreme sensitivity to rate changes.

*   The fund's  anticipated  value at  maturity  (AVM) rose by $2.32  because we
    lowered the  assumption  for expenses in our AVM  calculation to reflect the
    new, unified fee structure.

*  We sold some of our shortest  maturity and highest tax cost REFCORPs (defined
   on page 45) to meet shareholder redemptions.

*   Going  forward,  we'll work to move the  portfolio's  average  maturity date
    closer to the November 15, 2020 maturity of the benchmark.

TARGET MATURITIES TRUST: 2025

*   For the six months, the fund returned 16.48% (see the Total Returns table on
    page 25). Those returns reflect the recent decline in interest rates and the
    fund's extreme sensitivity to rate changes.

*   The fund's  anticipated  value at  maturity  (AVM) rose by $1.88  because we
    lowered the  assumption  for expenses in our AVM  calculation to reflect the
    new, unified fee structure.

*   Fund assets nearly tripled,  and we used that new money to buy STRIPS, which
    are the most liquid zero-coupon bonds (the easiest to buy and sell).

*   Going forward,  we'll continue to move the portfolio's average maturity date
    closer to the November 15, 2025 maturity of the benchmark.


                  TARGET: 2015

TOTAL RETURNS:                AS OF 3/31/98
     6 Months                       12.34%*
     1 Year                          33.47%

NET ASSETS:                  $145.1 million
     (AS OF 3/31/98)

INCEPTION DATE:                      9/1/86

TICKER SYMBOL:                        BTFTX


                 TARGET: 2020

TOTAL RETURNS:                AS OF 3/31/98
     6 Months                       15.27%*
     1 Year                          41.66%

NET ASSETS:                  $556.9 million
     (AS OF 3/31/98)

INCEPTION DATE:                    12/29/89

TICKER SYMBOL:                        BTTTX


                 TARGET: 2025

TOTAL RETURNS:                AS OF 3/31/98
     6 Months                       16.48%*
     1 Year                          47.14%

NET ASSETS:                  $205.5 million
     (AS OF 3/31/98)

INCEPTION DATE:                     2/15/96

TICKER SYMBOL:                        BTTRX

* Not annualized.

Many of the investment  terms in this report are defined in the Glossary on page
45.


SEMIANNUAL REPORT                                 REPORT HIGHLIGHTS       3


                              MARKET PERSPECTIVE

[line graph - data below]

Shifting Yield Curve for Treasury Zeros

Years to Maturity        9/30/97        3/31/98
1                        5.670%         5.600%
2                        5.840%         5.610%
3                        5.910%         5.670%
4                        5.990%         5.680%
5                        6.010%         5.750%
6                        6.095%         5.780%
7                        6.180%         5.810%
8                        6.230%         5.847%
9                        6.280%         5.883%
10                       6.330%         5.920%
11                       6.370%         5.952%
12                       6.410%         5.984%
13                       6.450%         6.016%
14                       6.490%         6.048%
15                       6.530%         6.080%
16                       6.548%         6.090%
17                       6.566%         6.100%
18                       6.584%         6.110%
19                       6.602%         6.120%
20                       6.620%         6.130%
21                       6.614%         6.126%
22                       6.608%         6.122%
23                       6.602%         6.118%
24                       6.596%         6.114%
25                       6.590%         6.110%
26                       6.556%         6.088%
27                       6.522%         6.066%
28                       6.488%         6.044%
29                       6.454%         6.022%
30                       6.420%         6.000%

REPRESENTATIVE RETURNS FOR ZEROS (six months ended 3/31/98)

   11/15/00 coupon STRIPS         3.77%
   11/15/05 coupon STRIPS         6.35%
   11/15/10 coupon STRIPS         8.92%
   11/15/15 coupon STRIPS         12.68%
   11/15/20 coupon STRIPS         15.52%
   11/15/25 coupon STRIPS         17.59%

Source: Bloomberg Financial Markets

EXCEPTIONAL PERFORMANCE

    Zero-coupon  Treasury bonds produced  outstanding  returns in the six months
ended March 31, 1998, when interest rates declined  sharply (see the yield curve
graphic at right).  Longer-term  zeros,  which are most  sensitive to changes in
rates, performed best. As shown in the accompanying table, the November 15, 2025
STRIPS issue returned 17.59%,  while the  shorter-term  November 15, 2000 STRIPS
returned 3.77%.

U.S. ECONOMY

    Interest  rates came down in part  because  inflation  remained  low despite
healthy U.S. economic growth. In 1997,  consumer prices rose at the slowest pace
in a dozen years.  Huge gains in worker  productivity and savings on health care
and benefits  costs  allowed  companies to pay higher wages  without  increasing
prices.  Lower  energy  and  commodity  prices  also  played  a role in  keeping
inflation in check. Oil prices hit a nine-year low in March 1998.

    While inflation was dormant, the economy roared ahead,  expanding by 3.7% in
the  fourth  quarter  of 1997 and 4.2% in the first  three  months of 1998.  The
unemployment rate reached a 24-year low during the period.

ASIAN FLU

    Economic  turmoil in Asia also  contributed  to lower U.S.  interest  rates.
Analysts expect slower Asian demand for U.S. goods to take the edge off economic
growth going forward.  In addition,  the dollar appreciated sharply against many
Asian  currencies.   A  stronger  dollar  makes  imports  cheaper  for  American
consumers,  limiting  the  ability  of  U.S.  companies  to push  through  price
increases.

SUPPLY AND DEMAND

    Demand  for  Treasury  bonds was  given a boost by the Asian  crisis--global
investors  looking for refuge from  volatile  world equity  markets  bought U.S.
Treasury securities for their relative safety.

    With inflation so low,  "real" yields on Treasurys  (nominal  interest rates
minus the current rate of  inflation)  exceeded 4%,  compared  with a historical
average of around 2%. High real  yields,  a healthy  economy  and strong  dollar
attracted large global capital flows to the U.S. bond market.

    Treasurys also benefited from an improving  federal budget picture.  Smaller
federal  budget  deficits mean less need for government  borrowing,  so Treasury
supply will likely  decline  going  forward.  That helped boost prices and lower
yields on existing securities.


4      MARKET PERSPECTIVE                     AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                         TARGET MATURITIES TRUST: 2000

                                                                                 AVERAGE ANNUAL RETURNS
                                      6 MONTHS         1 YEAR           3 YEARS         5 YEARS          10 YEARS
- -----------------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998*

<S>                                     <C>             <C>             <C>              <C>              <C>  
Target Maturities Trust: 2000 ........  3.47%           9.16%           8.11%            6.02%            9.86%

11/15/00 Maturity
STRIPS Issue .........................  3.77%           9.66%           8.56%            6.43%            10.36%

Merrill Lynch Long-Term
Treasury Index .......................  8.03%           20.49%          12.44%           8.96%            10.78%
</TABLE>

* Returns for periods less than one year are not annualized.

See pages 44-45 for more information  about returns,  the comparative  index and
the fund's benchmark.

[mountain graph - data below]

Growth of $10,000 Over Ten Years
$10,000 investment made 3/31/88

                                  Value on 3/31/98
                                      11/15/00           Merrill Lynch
                Target: 2000        STRIPS Issue        Long-Term Index
Mar-88             $10,000             $10,000              $10,000
Apr-88             $9,796              $9,762               $9,839
May-88             $9,554              $9,644               $9,666
Jun-88             $10,106             $10,189              $10,074
Jul-88             $9,873              $9,884               $9,883
Aug-88             $9,905              $9,967               $9,921
Sep-88             $10,420             $10,459              $10,296
Oct-88             $10,817             $10,872              $10,599
Nov-88             $10,547             $10,604              $10,367
Dec-88             $10,690             $10,647              $10,499
Jan-89             $10,964             $11,075              $10,711
Feb-89             $10,593             $10,685              $10,496
Mar-89             $10,739             $10,803              $10,607
Apr-89             $11,093             $11,134              $10,856
May-89             $11,530             $11,625              $11,288
Jun-89             $12,313             $12,417              $11,928
Jul-89             $12,629             $12,694              $12,200
Aug-89             $12,258             $12,333              $11,876
Sep-89             $12,310             $12,374              $11,921
Oct-89             $12,785             $12,921              $12,399
Nov-89             $12,891             $13,033              $12,500
Dec-89             $12,808             $13,020              $12,483
Jan-90             $12,244             $12,452              $12,057
Feb-90             $12,235             $12,405              $12,005
Mar-90             $12,250             $12,391              $11,974
Apr-90             $11,856             $12,012              $11,667
May-90             $12,417             $12,624              $12,211
Jun-90             $12,719             $12,927              $12,490
Jul-90             $12,851             $13,087              $12,618
Aug-90             $12,273             $12,490              $12,072
Sep-90             $12,402             $12,600              $12,227
Oct-90             $12,750             $13,036              $12,499
Nov-90             $13,314             $13,588              $13,018
Dec-90             $13,616             $13,906              $13,289
Jan-91             $13,720             $14,055              $13,439
Feb-91             $13,772             $13,997              $13,492
Mar-91             $13,835             $14,102              $13,536
Apr-91             $14,033             $14,373              $13,715
May-91             $14,013             $14,289              $13,714
Jun-91             $13,918             $14,199              $13,606
Jul-91             $14,125             $14,434              $13,805
Aug-91             $14,692             $14,962              $14,287
Sep-91             $15,152             $15,492              $14,733
Oct-91             $15,285             $15,538              $14,781
Nov-91             $15,469             $15,836              $14,852
Dec-91             $16,430             $16,824              $15,738
Jan-92             $15,757             $16,124              $15,227
Feb-92             $15,857             $16,216              $15,335
Mar-92             $15,639             $15,960              $15,166
Apr-92             $15,633             $16,061              $15,172
May-92             $16,062             $16,412              $15,571
Jun-92             $16,484             $16,843              $15,794
Jul-92             $17,221             $17,597              $16,439
Aug-92             $17,431             $17,855              $16,578
Sep-92             $17,883             $18,324              $16,833
Oct-92             $17,440             $17,843              $16,498
Nov-92             $17,348             $17,755              $16,548
Dec-92             $17,822             $18,232              $16,988
Jan-93             $18,377             $18,820              $17,491
Feb-93             $19,042             $19,502              $18,071
Mar-93             $19,128             $19,622              $18,120
Apr-93             $19,318             $19,820              $18,252
May-93             $19,258             $19,752              $18,320
Jun-93             $20,000             $20,511              $19,090
Jul-93             $20,072             $20,591              $19,384
Aug-93             $20,673             $21,207              $20,162
Sep-93             $20,826             $21,387              $20,251
Oct-93             $20,837             $21,366              $20,376
Nov-93             $20,466             $20,997              $19,857
Dec-93             $20,578             $21,111              $19,916
Jan-94             $20,987             $21,543              $20,400
Feb-94             $20,259             $20,808              $19,548
Mar-94             $19,563             $20,083              $18,750
Apr-94             $19,307             $19,808              $18,462
May-94             $19,321             $19,840              $18,373
Jun-94             $19,209             $19,739              $18,208
Jul-94             $19,600             $20,154              $18,783
Aug-94             $19,663             $20,218              $18,667
Sep-94             $19,255             $19,799              $18,101
Oct-94             $19,143             $19,703              $18,021
Nov-94             $19,013             $19,576              $18,117
Dec-94             $19,160             $19,722              $18,435
Jan-95             $19,577             $20,190              $18,906
Feb-95             $20,196             $20,861              $19,437
Mar-95             $20,276             $20,939              $19,578
Apr-95             $20,613             $21,278              $19,923
May-95             $21,666             $22,381              $21,464
Jun-95             $21,858             $22,567              $21,723
Jul-95             $21,723             $22,460              $21,384
Aug-95             $21,936             $22,685              $21,845
Sep-95             $22,112             $22,816              $22,239
Oct-95             $22,454             $23,235              $22,894
Nov-95             $22,845             $23,650              $23,455
Dec-95             $23,133             $23,934              $24,089
Jan-96             $23,357             $24,212              $24,076
Feb-96             $22,926             $23,755              $22,901
Mar-96             $22,647             $23,483              $22,465
Apr-96             $22,437             $23,250              $22,090
May-96             $22,336             $23,164              $21,984
Jun-96             $22,615             $23,459              $22,430
Jul-96             $22,667             $23,525              $22,430
Aug-96             $22,644             $23,496              $22,157
Sep-96             $23,002             $23,874              $22,764
Oct-96             $23,469             $24,401              $23,651
Nov-96             $23,830             $24,753              $24,428
Dec-96             $23,594             $24,523              $23,850
Jan-97             $23,670             $24,612              $23,695
Feb-97             $23,672             $24,612              $23,663
Mar-97             $23,471             $24,431              $23,100
Apr-97             $23,750             $24,723              $23,662
May-97             $23,926             $24,920              $23,915
Jun-97             $24,129             $25,144              $24,367
Jul-97             $24,643             $25,667              $25,776
Aug-97             $24,493             $25,528              $25,057
Sep-97             $24,757             $25,819              $25,761
Oct-97             $25,030             $26,093              $26,609
Nov-97             $25,047             $26,147              $26,958
Dec-97             $25,255             $26,370              $27,413
Jan-98             $25,593             $26,741              $27,956
Feb-98             $25,550             $26,701              $27,760
Mar-98             $25,619             $26,792              $27,830

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction costs and management fees) that reduce returns, while the index's
total return line does not.

PORTFOLIO AT A GLANCE
                                      3/31/98          9/30/97
Number of Securities                     51               31
Anticipated Growth Rate                 5.06%            5.24%
Weighted Average Maturity Date        11/14/00         11/14/00
Anticipated Value at Maturity
   (AVM--see graph on next page)       $101.49          $101.13
Expense Ratio                          0.60%*            0.56%

* Annualized.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2000       5


                         TARGET MATURITIES TRUST: 2000

MANAGEMENT Q & A

    An  interview  with  Dave  Schroeder,  a  portfolio  manager  on the  Target
Maturities Trust investment team.

HOW DID THE FUND PERFORM OVER THE LAST SIX MONTHS?

    Target:  2000 produced  positive  returns,  reflecting the recent decline in
interest rates (see the Market  Perspective on page 4). For the six months ended
March 31, 1998, the fund returned  3.47%,  while its  benchmark,  a November 15,
2000 STRIPS issue,  returned 3.77%. (See the Total Returns table on the previous
page for other fund performance  comparisons.) However, fund returns are reduced
by management expenses and transaction costs, while the benchmark's are not.

TARGET: 2000'S ANTICIPATED VALUE AT MATURITY (AVM) INCREASED BY $0.36 (SEE PAGE
5). WHY?

    The higher AVM is a result of the new,  unified fee  structure  shareholders
approved last summer.  We  approximate  the fund's  anticipated  growth rate and
value at maturity each day, so shareholders  have an idea what their  investment
should  return  if they  hold  their  shares  to the  maturity  date.  But  that
calculation  assumes that the expense  ratio and  portfolio  composition  remain
constant over the life of the fund. In the past, our AVM  calculation  was based
on the old expense cap of 0.70%,  though actual fund expenses  varied.  Lowering
the  assumption  for expenses in our  calculation  to 0.60%--the  fund's current
management fee--caused the anticipated value at maturity to rise.

[line graph - data below]

Target: 2000's Share Price vs. Anticipated Value at Maturity

             Actual Share Price            Anticipated Value at Maturity
               (Historical)                   (Estimated Share Price)
'85               $26.77                              $100
'86               $35.44                              $100
'87               $33.33                              $98.69
'88               $37.16                              $97.43
'89               $44.52                              $96.21
'90               $47.33                              $97.59
'91               $57.11                              $98.91
'92               $61.947                             $101.16
'93               $71.526                             $100.708
'94               $66.598                             $100.829
'95               $80.408                             $100.992
'96               $79.947                             $101.102
'97               $86.06                              $101.13
'98               $89.05                              $101.49
'99
'00

The top line in the graph  represents the fund's  Anticipated  Value at Maturity
(AVM--defined  on page 45), which fluctuates from day to day based on the fund's
expected  maturity date. The bottom line represents the fund's  historical share
price, which is managed to grow over time to reach the fund's AVM.

While this graph  demonstrates  the fund's  expected  long-term  growth pattern,
please  keep in mind  that  the  fund  may  experience  significant  share-price
volatility over the short term.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


6      TARGET MATURITIES TRUST: 2000          AMERICAN CENTURY INVESTMENTS


                         TARGET MATURITIES TRUST: 2000

THE CHARTS BELOW SHOW THAT THE FUND'S STRIPS HOLDINGS DECREASED OVER THE LAST
SIX MONTHS. WHY THE CHANGE?

    The decrease in STRIPS was  partially  cash-flow  related.  Fund assets fell
from about $248 million to around $240 million over the last six months.  STRIPS
are the most liquid (the easiest to buy and sell) zero-coupon  bonds, so we sold
them to meet shareholder redemptions. We also sold STRIPS and bought PHYSICALs.

WHAT ARE "PHYSICALS" AND WHY BUY THEM?

    PHYSICALs  are the stripped  interest and  principal  payments from Treasury
bearer bonds traded in physical  form. We bought these zeros because their yield
to maturity was 0.20% higher than STRIPS yields.  We bought a nearly $15 million
par value piece that consisted of the principal portion of a Treasury long bond.
We'll try to convert these  physical zeros into wirable  securities,  which will
cause their prices to rise relative to STRIPS.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

    While it's  possible  rates  could go lower,  we think the  majority  of the
decline in yields is already  behind us. In our opinion,  economic  growth would
have to slow  significantly  to get  bond  prices  moving  higher  again,  and a
slowdown of that  magnitude  doesn't  seem likely in the near  future.  Analysts
thought  slower  demand  from Asia  would put the brakes on the  economy,  but a
robust consumer sector has kept growth strong. Continued economic strength helps
establish  a floor on how low  interest  rates can  go--the  Federal  Reserve is
reluctant  to lower  short-term  interest  rates as long as the economy  remains
robust and there's at least the threat of inflation from higher wages.

WHAT ARE YOUR PLANS FOR THE FUND GOING FORWARD?

    We manage Target:  2000 to deliver a pure play on zero-coupon bonds,  giving
shareholders  the total return and interest rate  sensitivity of a zero maturing
November 15, 2000.  While there's no assurance that Target:  2000 will reach its
anticipated value at maturity, we'll manage the fund to try to meet or beat that
value.  To do that,  we'll  continue to work to keep the average  maturity  date
close to that of the benchmark.  We'll also try to keep turnover and transaction
costs down by using cash  inflows and  outflows as  opportunities  to adjust the
portfolio's  composition  and weighted  average  maturity date.  We're likely to
continue to use STRIPS to meet liquidity needs,  while we'll look for additional
yield in other types of zeros.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
STRIPS             53%
TRs                30%
PHYSICALs           5%
CUBES               5%
Other               7%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
STRIPS             62%
TRs                28%
Other              10%


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2000       7


                            SCHEDULE OF INVESTMENTS
                         TARGET MATURITIES TRUST: 2000

MARCH 31, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

ZERO-COUPON U.S. TREASURY SECURITIES(1)

              $      71,250  CUBES, 8.76%, 8/15/99                $      65,971

                     75,000  ETR, 5.26%, 11/15/99                        68,408

                    153,000  STRIPS -- COUPON, 5.40%,
                                 11/15/99                               139,860

                  2,836,700  TBR, 7.83%, 11/15/99                     2,588,178

                     75,000  TR, 5.20%, 11/15/99                         68,483

                    349,800  TR, 5.46%, 11/15/99                        319,406

                    133,000  CATS, 5.22%, 2/15/00                       119,737

                     88,125  CUBES, 8.60%, 2/15/00                       79,337

                 12,100,000  STRIPS -- COUPON, 5.73%,
                                 2/15/00                             10,907,253

                    306,945  TBR, 8.80%, 2/15/00                        276,083

                 29,708,220  TR, 6.69%, 2/15/00                      26,745,584

                     28,146  TR, 8.50%, 2/15/00                          25,339

                    199,843  TR, 8.88%, 2/15/00                         179,914

                    100,000  TR, 9.28%, 2/15/00                          90,028

                    149,000  CATS, 5.25%, 5/15/00                       132,457

                  5,850,000  CUBES, 5.68%, 5/15/00                    5,195,123

                    645,525  TBR, 8.62%, 5/15/00                        573,262

                    849,000  TBR, 8.72%, 5/15/00                        753,959

                  5,000,000  CUBES, 5.50%, 8/15/00                    4,374,037

                 46,800,000  STRIPS -- COUPON, 5.49%,
                                 8/15/00                             41,007,242

                  9,667,000  STRIPS -- PRINCIPAL, 6.94%,
                                 8/15/00                              8,473,385

                    894,045  TBR, 8.72%, 8/15/00                        781,215

                  2,735,000  COUGAR, 7.38%, 11/15/00                  2,358,205

                  1,197,000  COUGAR, 8.37%, 11/15/00                  1,032,092

                    410,625  CUBES, 9.26%, 11/15/00                     354,415

                 39,391,000  STRIPS -- PRINCIPAL, 7.61%,
                                 11/15/00                            34,055,225

                  3,754,000  TIGR, 7.83%, 11/15/00                    3,240,122

                    265,000  TR, 5.85%, 11/15/00                        228,725

                  1,199,424  TR, 7.17%, 11/15/00                      1,035,237

                     29,600  TR, 8.49%, 11/15/00                         25,548

                        843  TR, 9.43%, 11/15/00                            728

                    381,769  TR, 9.52%, 11/15/00                        329,509

                    376,250  TR, 9.79%, 11/15/00                        324,746

                     75,000  CATS, 5.34%, 2/15/01                        63,807

                 20,700,000  STRIPS -- COUPON, 6.19%,
                                 2/15/01                             17,645,295


Principal Amount                                                        Value
- --------------------------------------------------------------------------------

               $  4,657,000  TIGR, 5.52%, 2/15/01                $    3,962,002

                  3,933,650  TR, 5.52%, 2/15/01                       3,346,603

                  2,052,928  TR, 5.87%, 2/15/01                       1,746,555

                  4,435,750  TR, 6.92%, 2/15/01                       3,773,771

                 10,000,000  TR, 7.80%, 2/15/01                       8,507,627

                  1,400,000  COUGAR, 5.63%, 5/15/01                   1,173,120

                  1,496,250  CUBES, 6.21%, 5/15/01                    1,253,391

                     44,000  TIGR, 5.39%, 5/15/01                        36,914

                 24,350,000  TR, 7.06%, 5/15/01                      20,428,689

                 17,450,000  STRIPS -- PRINCIPAL, 7.44%,
                                 8/15/01                             14,451,020

                  7,060,020  TR, 5.38%, 8/15/01                       5,835,173

                 15,000,000  U.S. Treasury Corpus, 5.99%,
                                 11/15/01                            12,200,983
                                                             -------------------

TOTAL INVESTMENT SECURITIES--100.0%                                $240,373,763
                                                             ===================
   (Cost $234,953,553)

NOTES TO SCHEDULE OF INVESTMENTS

CATS = Certificates of Accrual of Treasury Securities

COUGAR = Coupons on Underlying Government Securities

CUBES = Coupons Under Book Entry Safekeeping

ETR = Easy Growth Treasury Receipts

STRIPS = Separate Trading of Registered Interest and Principal of Securities

TBR = Treasury Bond Receipts

TIGR = Treasury Investment Growth Receipts

TR = Treasury Receipts

(1)  Rates indicated are the yield to maturity at purchase. These securities are
     purchased at a substantial discount from their value at maturity.

See Notes to Financial Statements


8      TARGET MATURITIES TRUST: 2000          AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                         TARGET MATURITIES TRUST: 2005

                                                                                AVERAGE ANNUAL RETURNS
                                     6 MONTHS         1 YEAR           3 YEARS         5 YEARS          10 YEARS
- -----------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998*

<S>                                    <C>             <C>             <C>              <C>              <C>   
Target Maturities Trust: 2005 ........ 6.18%           17.05%          11.55%           8.72%            12.01%

11/15/05 Maturity
STRIPS Issue ......................... 6.35%           17.52%          12.09%           8.96%            12.25%

Merrill Lynch Long-Term
Treasury Index ....................... 8.03%           20.49%          12.44%           8.96%            10.78%
</TABLE>

* Returns for periods less than one year are not annualized.

See pages 44-45 for more information  about returns,  the comparative  index and
the fund's benchmark.


[mountain graph - data below]

Growth of $10,000 Over Ten Years
$10,000 investment made 3/31/88

                                   Value on 3/31/98
                                       11/15/05           Merrill Lynch
                 Target: 2005        STRIPS Issue        Long-Term Index
Mar-88             $10,000              $10,000              $10,000
Apr-88             $9,751               $9,610               $9,839
May-88             $9,420               $9,434               $9,666
Jun-88             $10,308              $10,278              $10,074
Jul-88             $9,832               $9,770               $9,883
Aug-88             $9,891               $9,853               $9,921
Sep-88             $10,503              $10,497              $10,296
Oct-88             $11,098              $11,089              $10,599
Nov-88             $10,717              $10,725              $10,367
Dec-88             $11,048              $10,998              $10,499
Jan-89             $11,379              $11,427              $10,711
Feb-89             $10,975              $11,053              $10,496
Mar-89             $11,147              $11,243              $10,607
Apr-89             $11,510              $11,574              $10,856
May-89             $12,086              $12,231              $11,288
Jun-89             $13,184              $13,239              $11,928
Jul-89             $13,379              $13,392              $12,200
Aug-89             $12,939              $12,888              $11,876
Sep-89             $12,975              $12,933              $11,921
Oct-89             $13,710              $13,748              $12,399
Nov-89             $13,859              $13,902              $12,500
Dec-89             $13,687              $13,777              $12,483
Jan-90             $12,776              $12,845              $12,057
Feb-90             $12,662              $12,755              $12,005
Mar-90             $12,639              $12,673              $11,974
Apr-90             $12,095              $12,047              $11,667
May-90             $12,930              $13,014              $12,211
Jun-90             $13,329              $13,456              $12,490
Jul-90             $13,374              $13,496              $12,618
Aug-90             $12,422              $12,438              $12,072
Sep-90             $12,580              $12,597              $12,227
Oct-90             $12,930              $13,014              $12,499
Nov-90             $13,837              $13,961              $13,018
Dec-90             $14,177              $14,325              $13,289
Jan-91             $14,272              $14,487              $13,439
Feb-91             $14,345              $14,375              $13,492
Mar-91             $14,367              $14,450              $13,536
Apr-91             $14,599              $14,658              $13,715
May-91             $14,499              $14,538              $13,714
Jun-91             $14,313              $14,392              $13,606
Jul-91             $14,567              $14,724              $13,805
Aug-91             $15,288              $15,340              $14,287
Sep-91             $15,932              $16,067              $14,733
Oct-91             $15,909              $15,980              $14,781
Nov-91             $15,995              $16,103              $14,852
Dec-91             $17,220              $17,405              $15,738
Jan-92             $16,476              $16,654              $15,227
Feb-92             $16,562              $16,732              $15,335
Mar-92             $16,268              $16,369              $15,166
Apr-92             $16,136              $16,223              $15,172
May-92             $16,739              $16,821              $15,571
Jun-92             $17,034              $17,092              $15,794
Jul-92             $18,036              $18,087              $16,439
Aug-92             $18,204              $18,272              $16,578
Sep-92             $18,676              $18,784              $16,833
Oct-92             $18,100              $18,175              $16,498
Nov-92             $18,159              $18,248              $16,548
Dec-92             $18,866              $18,991              $16,988
Jan-93             $19,483              $19,653              $17,491
Feb-93             $20,503              $20,654              $18,071
Mar-93             $20,463              $20,680              $18,120
Apr-93             $20,744              $20,949              $18,252
May-93             $20,762              $21,032              $18,320
Jun-93             $22,045              $22,334              $19,090
Jul-93             $22,345              $22,639              $19,384
Aug-93             $23,274              $23,587              $20,162
Sep-93             $23,510              $23,928              $20,251
Oct-93             $23,624              $23,998              $20,376
Nov-93             $22,753              $23,083              $19,857
Dec-93             $22,934              $23,274              $19,916
Jan-94             $23,728              $24,035              $20,400
Feb-94             $22,385              $22,712              $19,548
Mar-94             $21,261              $21,362              $18,750
Apr-94             $21,048              $21,034              $18,462
May-94             $20,930              $20,937              $18,373
Jun-94             $20,721              $20,733              $18,208
Jul-94             $21,370              $21,422              $18,783
Aug-94             $21,320              $21,402              $18,667
Sep-94             $20,512              $20,574              $18,101
Oct-94             $20,354              $20,459              $18,021
Nov-94             $20,508              $20,593              $18,117
Dec-94             $20,893              $21,000              $18,435
Jan-95             $21,419              $21,565              $18,906
Feb-95             $22,204              $22,362              $19,437
Mar-95             $22,390              $22,560              $19,578
Apr-95             $22,862              $23,047              $19,923
May-95             $24,862              $25,088              $21,464
Jun-95             $25,179              $25,411              $21,723
Jul-95             $24,707              $24,969              $21,384
Aug-95             $25,224              $25,496              $21,845
Sep-95             $25,673              $25,955              $22,239
Oct-95             $26,308              $26,625              $22,894
Nov-95             $27,061              $27,399              $23,455
Dec-95             $27,714              $28,074              $24,089
Jan-96             $27,751              $28,137              $24,076
Feb-96             $26,449              $26,811              $22,901
Mar-96             $25,959              $26,341              $22,465
Apr-96             $25,433              $25,773              $22,090
May-96             $25,243              $25,591              $21,984
Jun-96             $25,732              $26,126              $22,430
Jul-96             $25,769              $26,144              $22,430
Aug-96             $25,528              $25,895              $22,157
Sep-96             $26,228              $26,605              $22,764
Oct-96             $27,172              $27,662              $23,651
Nov-96             $28,052              $28,486              $24,428
Dec-96             $27,371              $27,788              $23,850
Jan-97             $27,275              $27,750              $23,695
Feb-97             $27,248              $27,701              $23,663
Mar-97             $26,553              $27,032              $23,100
Apr-97             $27,166              $27,661              $23,662
May-97             $27,484              $27,974              $23,915
Jun-97             $27,888              $28,453              $24,367
Jul-97             $29,266              $29,831              $25,776
Aug-97             $28,587              $29,160              $25,057
Sep-97             $29,273              $29,872              $25,761
Oct-97             $29,999              $30,618              $26,609
Nov-97             $30,161              $30,742              $26,958
Dec-97             $30,556              $31,181              $27,413
Jan-98             $31,250              $31,957              $27,956
Feb-98             $31,037              $31,709              $27,760
Mar-98             $31,079              $31,767              $27,830

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction costs and management fees) that reduce returns, while the index's
total return line does not.


PORTFOLIO AT A GLANCE
                                      3/31/98           9/30/97
Number of Securities                     38                34
Anticipated Growth Rate                 5.23%             5.57%
Weighted Average Maturity Date        12/02/05          11/16/05
Anticipated Value at Maturity
   (AVM--see graph on next page)       $101.83           $100.85
Expense Ratio                          0.60%*             0.57%

* Annualized.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2005       9


                         TARGET MATURITIES TRUST: 2005

MANAGEMENT Q & A

    An  interview  with  Dave  Schroeder,  a  portfolio  manager  on the  Target
Maturities Trust investment team.

HOW DID THE FUND PERFORM OVER THE LAST SIX MONTHS?

    Target:  2005  performed  well,  producing a 6.18% return for the six months
ended March 31, 1998.  For the year ended in March,  the fund  returned  17.05%.
Those  positive  returns are a product of lower  interest rates overall (see the
Market Perspective on page 4).

    The fund's benchmark,  a November 15, 2005 STRIPS issue,  returned 6.35% for
the six months. (See the Total Returns table on the previous page for additional
fund  performance  comparisons.)  Keep in mind that fund  returns are reduced by
management expenses and transaction costs, while the benchmark's are not.

TARGET: 2005'S ANTICIPATED VALUE AT MATURITY (AVM) INCREASED BY $0.98 (SEE PAGE
9). WHY?

    The higher AVM is a result of the new,  unified fee  structure  shareholders
approved last summer.  We  approximate  the fund's  anticipated  growth rate and
value at maturity each day, so shareholders  have an idea what their  investment
should  return  if they  hold  their  shares  to the  maturity  date.  But  that
calculation  assumes that the expense  ratio and  portfolio  composition  remain
constant over the life of the fund. In the past, our AVM  calculation  was based
on the old expense cap of 0.70%,  though actual fund expenses  varied.  Lowering
the  assumption  for expenses in our  calculation  to 0.60%--the  fund's current
management fee--caused the anticipated value at maturity to rise.

[line graph - data below]

Target: 2005's Share Price vs. Anticipated Value at Maturity

             Actual Share Price            Anticipated Value at Maturity
               (Historical)                   (Estimated Share Price)
'85               $16.69                              $98
'86               $23.74                              $97
'87               $21.28                              $94.59
'88               $24.36                              $93.66
'89               $30.18                              $93.14
'90               $31.26                              $97.25
'91               $37.97                              $99.29
'92               $41.597                             $99.625
'93               $50.575                             $100.087
'94               $46.066                             $100.516
'95               $61.108                             $100.34
'96               $57.829                             $100.707
'97               $64.54                              $100.85
'98               $68.53                              $101.82
'99
'00
'01
'02
'03
'04
'05

The top line in the graph  represents the fund's  Anticipated  Value at Maturity
(AVM--defined  on page 45), which fluctuates from day to day based on the fund's
expected  maturity date. The bottom line represents the fund's  historical share
price, which is managed to grow over time to reach the fund's AVM.

While this graph  demonstrates  the fund's  expected  long-term  growth pattern,
please  keep in mind  that  the  fund  may  experience  significant  share-price
volatility over the short term.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


10      TARGET MATURITIES TRUST: 2005          AMERICAN CENTURY INVESTMENTS


                         TARGET MATURITIES TRUST: 2005

THE CHARTS BELOW SHOW THE FUND'S STRIPS HOLDINGS  INCREASED  SUBSTANTIALLY  OVER
THE LAST SIX MONTHS. WHY THE CHANGE?

    The increase in STRIPS was largely cash-flow related.  Fund assets grew from
$282 million to $406 million over the last six months. Some of that increase was
from appreciation, but the vast majority was from new money. STRIPS are the most
liquid (easiest to buy and sell)  zero-coupon  bonds, so we used them to put the
new cash to work quickly.

    One of the things we do to keep the fund's  turnover and  transaction  costs
down is use cash  inflows  and  outflows as  opportunities  to adjust the fund's
portfolio and average maturity date.  Because there was some additional yield to
be had by buying  longer-maturity  STRIPS,  we used the new money to extend  the
fund's weighted average maturity date out to early December 2005. We did that by
buying STRIPS  maturing in February 2006.  Those  securities  carried about five
extra basis points in yield over  2005-maturity  STRIPS.  That additional  yield
also  contributed  slightly to the increase in the fund's  anticipated  value at
maturity.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

    While it's  possible  rates  could go lower,  we think the  majority  of the
decline in yields is already  behind us. In our opinion,  economic  growth would
have to slow  significantly  to get  bond  prices  moving  higher  again,  and a
slowdown of that  magnitude  doesn't  seem likely in the near  future.  Analysts
thought  slower  demand  from Asia  would put the brakes on the  economy,  but a
robust consumer sector has kept growth strong. Continued economic strength helps
establish  a floor on how low  interest  rates can  go--the  Federal  Reserve is
reluctant  to lower  short-term  interest  rates as long as the economy  remains
robust and there's at least the threat of inflation from higher wages.

WHAT ARE YOUR PLANS FOR THE FUND GOING FORWARD?

    We manage Target:  2005 to deliver a pure play on zero-coupon bonds,  giving
shareholders  the total return and interest rate  sensitivity of a zero maturing
November 15, 2005.  While there's no assurance that Target:  2005 will reach its
anticipated value at maturity, we'll manage the fund to try to meet or beat that
value.  To do that,  we'll  continue to work to keep the average  maturity  date
close to that of the benchmark.  We'll also try to keep turnover and transaction
costs down by using cash  inflows and  outflows as  opportunities  to adjust the
portfolio's  composition  and weighted  average  maturity date.  We're likely to
continue to use STRIPS to meet liquidity needs,  while we'll look for additional
yield in other types of zeros.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
STRIPS             56%
REFCORPs           30%
CATS                6%
TRs                 4%
Other               4%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
STRIPS             41%
REFCORPs           40%
CATS                8%
TRs                 6%
Other               5%


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2005       11


                            SCHEDULE OF INVESTMENTS
                         TARGET MATURITIES TRUST: 2005

MARCH 31, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

ZERO-COUPON U.S. TREASURY SECURITIES(1)

             $      693,750  CUBES, 6.56%, 11/15/04             $       473,879

                     87,000  ETR, 5.96%, 11/15/04                        59,122

                     27,000  TIGR, 5.90%, 11/15/04                       18,443

                 11,500,000  REFCORP STRIPS -- COUPON,
                                 5.95%, 1/15/05                       7,766,641

                  4,500,000  STRIPS -- COUPON, 6.37%,
                                 2/15/05                              3,044,386

                  3,200,000  U.S. Treasury Corpus, 9.00%,
                                 2/15/05                              2,139,021

                  2,000,000  REFCORP STRIPS -- COUPON,
                                 5.84%, 4/15/05                       1,330,553

                  4,615,672  CUBES, 8.59%, 5/15/05                    3,060,192

                  1,000,000  ETR, 6.67%, 5/15/05                        659,341

                 38,374,000  STRIPS -- COUPON, 6.79%,
                                 5/15/05                             25,583,219

                 33,059,000  STRIPS -- PRINCIPAL, 6.62%,
                                 5/15/05                             22,039,809

                    428,750  TBR, 9.37%, 5/15/05                        282,693

                  6,450,000  TR, 8.38%, 5/15/05                       4,261,586

                 12,500,000  REFCORP STRIPS -- COUPON,
                                 6.76%, 7/15/05                       8,189,884

                  9,000,000  STRIPS -- COUPON, 5.50%,
                                 8/15/05                              5,909,701

                 59,500,000  STRIPS -- PRINCIPAL, 6.58%,
                                 8/15/05                             39,069,693

                 50,270,000  REFCORP STRIPS -- COUPON,
                                 6.51%, 10/15/05                     32,453,413

                    170,000  CATS, 6.21%, 11/15/05                      109,383

                    491,519  CUBES, 8.86%, 11/15/05                     316,257

                  6,500,000  STRIPS -- COUPON, 6.24%,
                                 11/15/05                             4,207,134

                  2,247,000  TBR, 8.45%, 11/15/05                     1,437,246

                 10,900,000  U.S. Treasury Corpus, 7.73%,
                                 11/15/05                             6,961,641

                 46,429,000  REFCORP STRIPS -- COUPON,
                                 7.45%, 1/15/06                      29,494,482

                187,056,000  STRIPS -- COUPON, 6.03%,
                                 2/15/06                            119,146,134

                 19,415,340  TR, 8.23%, 2/15/06                      12,291,214

                 56,800,000  REFCORP STRIPS -- COUPON,
                                 7.09%, 4/15/06                      35,564,472

                    107,000  CATS, 6.05%, 5/15/06                        66,778


Principal Amount                                                        Value
- --------------------------------------------------------------------------------

              $  36,132,000  CATS, 8.83%, 5/15/06                 $  22,461,083

                  2,567,000  CATS, 8.84%, 5/15/06                     1,595,749

                    566,500  CUBES, 6.53%, 5/15/06                      353,551

                  4,718,000  STRIPS -- COUPON, 7.66%,
                                 5/15/06                              2,963,133

                    410,000  TBR, 8.46%, 5/15/06                        254,270

                  1,000,000  TR, 8.40%, 5/15/06                         621,640

                    146,346  TR, 8.89%, 5/15/06                          91,334

                 11,428,000  REFCORP STRIPS -- COUPON,
                                 7.03%, 7/15/06                       7,045,706

                  8,000,000  STRIPS -- COUPON, 5.80%,
                                 8/15/06                              4,947,757

                  1,299,780  TR, 8.86%, 8/15/06                         798,658
                                                             -------------------

TOTAL INVESTMENT SECURITIES--100.0%                                $407,069,198
                                                             ===================
   (Cost $380,831,587)

NOTES TO SCHEDULE OF INVESTMENTS

CATS = Certificates of Accrual of Treasury Securities

CUBES = Coupons Under Book Entry Safekeeping

ETR = Easy Growth Treasury Receipts

REFCORP = Resolution Funding Corporation

STRIPS = Separate Trading of Registered Interest and Principal of Securities

TBR = Treasury Bond Receipts

TIGR = Treasury Investment Growth Receipts

TR = Treasury Receipts

(1)  Rates indicated are the yield to maturity at purchase. These securities are
     purchased at a substantial discount from their value at maturity.

See Notes to Financial Statements


12      TARGET MATURITIES TRUST: 2005          AMERICAN CENTURY INVESTMENTS

<TABLE>
<CAPTION>
                         TARGET MATURITIES TRUST: 2010

                                                                                AVERAGE ANNUAL RETURNS
                                     6 MONTHS         1 YEAR           3 YEARS         5 YEARS          10 YEARS
- ----------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998*

<S>                                    <C>             <C>             <C>             <C>               <C>   
Target Maturities Trust: 2010 .......  8.79%           24.23%          14.72%          10.78%            13.22%

11/15/10 Maturity
STRIPS Issue ........................  8.92%           24.94%          15.49%          11.39%            13.61%

Merrill Lynch Long-Term
Treasury Index ......................  8.03%           20.49%          12.44%           8.96%            10.78%
</TABLE>

* Returns for periods less than one year are not annualized.

See pages 44-45 for more information  about returns,  the comparative  index and
the fund's benchmark.


[mountain graph - data below]

Growth of $10,000 Over Ten Years
$10,000 investment made 3/31/88

                                   Value on 3/31/98
                                       11/15/10           Merrill Lynch
                Target: 2010         STRIPS Issue        Long-Term Index
Mar-88             $10,000              $10,000              $10,000
Apr-88             $9,657               $9,482               $9,839
May-88             $9,210               $9,157               $9,666
Jun-88             $10,162              $10,160              $10,074
Jul-88             $9,605               $9,497               $9,883
Aug-88             $9,631               $9,557               $9,921
Sep-88             $10,395              $10,326              $10,296
Oct-88             $11,049              $11,061              $10,599
Nov-88             $10,615              $10,638              $10,367
Dec-88             $11,204              $10,965              $10,499
Jan-89             $11,528              $11,569              $10,711
Feb-89             $10,900              $10,942              $10,496
Mar-89             $11,159              $11,186              $10,607
Apr-89             $11,547              $11,616              $10,856
May-89             $12,434              $12,504              $11,288
Jun-89             $13,793              $13,951              $11,928
Jul-89             $13,955              $14,044              $12,200
Aug-89             $13,307              $13,328              $11,876
Sep-89             $13,327              $13,442              $11,921
Oct-89             $14,246              $14,414              $12,399
Nov-89             $14,447              $14,566              $12,500
Dec-89             $14,343              $14,511              $12,483
Jan-90             $13,074              $13,148              $12,057
Feb-90             $12,887              $13,024              $12,005
Mar-90             $12,783              $12,935              $11,974
Apr-90             $12,123              $12,139              $11,667
May-90             $13,159              $13,490              $12,211
Jun-90             $13,676              $14,067              $12,490
Jul-90             $13,592              $14,059              $12,618
Aug-90             $12,233              $12,340              $12,072
Sep-90             $12,414              $12,618              $12,227
Oct-90             $12,828              $12,991              $12,499
Nov-90             $14,006              $14,179              $13,018
Dec-90             $14,382              $14,555              $13,289
Jan-91             $14,608              $14,658              $13,439
Feb-91             $14,595              $14,502              $13,492
Mar-91             $14,615              $14,599              $13,536
Apr-91             $14,809              $14,873              $13,715
May-91             $14,738              $14,701              $13,714
Jun-91             $14,401              $14,417              $13,606
Jul-91             $14,647              $14,717              $13,805
Aug-91             $15,528              $15,576              $14,287
Sep-91             $16,233              $16,362              $14,733
Oct-91             $16,104              $16,234              $14,781
Nov-91             $15,974              $16,044              $14,852
Dec-91             $17,411              $17,533              $15,738
Jan-92             $16,628              $16,748              $15,227
Feb-92             $16,744              $16,851              $15,335
Mar-92             $16,427              $16,521              $15,166
Apr-92             $16,175              $16,252              $15,172
May-92             $16,900              $16,979              $15,571
Jun-92             $16,990              $17,040              $15,794
Jul-92             $18,045              $18,086              $16,439
Aug-92             $18,123              $18,143              $16,578
Sep-92             $18,466              $18,484              $16,833
Oct-92             $18,019              $18,031              $16,498
Nov-92             $18,252              $18,310              $16,548
Dec-92             $19,113              $19,177              $16,988
Jan-93             $19,709              $19,762              $17,491
Feb-93             $20,828              $20,921              $18,071
Mar-93             $20,744              $20,880              $18,120
Apr-93             $20,945              $21,006              $18,252
May-93             $21,107              $21,195              $18,320
Jun-93             $22,686              $22,815              $19,090
Jul-93             $23,495              $23,646              $19,384
Aug-93             $24,667              $24,837              $20,162
Sep-93             $24,673              $24,887              $20,251
Oct-93             $24,990              $25,264              $20,376
Nov-93             $24,026              $24,266              $19,857
Dec-93             $24,136              $24,384              $19,916
Jan-94             $25,133              $25,395              $20,400
Feb-94             $23,385              $23,617              $19,548
Mar-94             $21,948              $22,156              $18,750
Apr-94             $21,579              $21,690              $18,462
May-94             $21,197              $21,338              $18,373
Jun-94             $20,874              $21,021              $18,208
Jul-94             $21,883              $22,067              $18,783
Aug-94             $21,547              $21,755              $18,667
Sep-94             $20,498              $20,608              $18,101
Oct-94             $20,330              $20,495              $18,021
Nov-94             $20,699              $20,887              $18,117
Dec-94             $21,346              $21,562              $18,435
Jan-95             $21,987              $22,262              $18,906
Feb-95             $22,705              $22,995              $19,437
Mar-95             $22,926              $23,248              $19,578
Apr-95             $23,463              $23,825              $19,923
May-95             $26,091              $26,566              $21,464
Jun-95             $26,563              $27,074              $21,723
Jul-95             $25,877              $26,376              $21,384
Aug-95             $26,615              $27,162              $21,845
Sep-95             $27,275              $27,873              $22,239
Oct-95             $28,324              $29,031              $22,894
Nov-95             $29,307              $30,020              $23,455
Dec-95             $30,330              $31,118              $24,089
Jan-96             $30,162              $30,907              $24,076
Feb-96             $28,019              $28,714              $22,901
Mar-96             $27,307              $27,999              $22,465
Apr-96             $26,498              $27,118              $22,090
May-96             $26,291              $26,978              $21,984
Jun-96             $27,062              $27,812              $22,430
Jul-96             $27,074              $27,794              $22,430
Aug-96             $26,544              $27,236              $22,157
Sep-96             $27,489              $28,275              $22,764
Oct-96             $28,907              $29,786              $23,651
Nov-96             $30,228              $31,097              $24,428
Dec-96             $29,258              $30,077              $23,850
Jan-97             $28,915              $29,727              $23,695
Feb-97             $28,884              $29,684              $23,663
Mar-97             $27,867              $28,663              $23,100
Apr-97             $28,675              $29,556              $23,662
May-97             $29,045              $29,919              $23,915
Jun-97             $29,678              $30,643              $24,367
Jul-97             $31,910              $32,952              $25,776
Aug-97             $30,720              $31,677              $25,057
Sep-97             $31,820              $32,877              $25,761
Oct-97             $33,010              $34,158              $26,609
Nov-97             $33,442              $34,633              $26,958
Dec-97             $34,154              $35,292              $27,413
Jan-98             $34,906              $36,092              $27,956
Feb-98             $34,571              $35,763              $27,760
Mar-98             $34,615              $35,810              $27,830

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction costs and management fees) that reduce returns, while the index's
total return line does not.


PORTFOLIO AT A GLANCE
                                      3/31/98          9/30/97
Number of Securities                     16               16
Anticipated Growth Rate                 5.44%            5.80%
Weighted Average Maturity Date        10/07/10         10/03/10
Anticipated Value at Maturity
   (AVM--see graph on next page)      $104.68           $103.40
Expense Ratio                          0.60%*            0.62%

* Annualized.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2010       13


                         TARGET MATURITIES TRUST: 2010

MANAGEMENT Q & A

    An  interview  with  Dave  Schroeder,  a  portfolio  manager  on the  Target
Maturities Trust investment team.

HOW DID THE FUND PERFORM OVER THE LAST SIX MONTHS?

    Target:  2010 performed  well,  producing an 8.79% return for the six months
ended March 31, 1998. For the year ended in March, the fund returned 24.23%. The
fund's impressive  returns reflect the recent decline in interest rates (see the
Market Perspective on page 4).

    Target: 2010's benchmark,  a November 15, 2010 STRIPS issue, returned 8.92%.
(See the Total  Returns  table on the previous  page for other fund  performance
comparisons.)  Keep in mind that fund returns are reduced by management fees and
transaction costs, while the benchmark's are not.

TARGET: 2010'S ANTICIPATED VALUE AT MATURITY (AVM) INCREASED BY $1.28 (SEE PAGE
13). WHY?

    The  higher  AVM is  largely  a result  of the new,  unified  fee  structure
shareholders  approved last summer. We approximate the fund's anticipated growth
rate and value at  maturity  each day, so  shareholders  have an idea what their
investment  should  return if they hold their shares to the maturity  date.  But
that calculation assumes that the expense ratio and portfolio composition remain
constant over the life of the fund. In the past, our AVM  calculation  was based
on the old expense cap of 0.70%,  though actual fund expenses  varied.  Lowering
the  assumption  for expenses in our  calculation  to 0.60%--the  fund's current
management fee--caused the anticipated value at maturity to rise.

[line graph - data below]

Target: 2010's Share Price vs. Anticipated Value at Maturity

             Actual Share Price            Anticipated Value at Maturity
               (Historical)                   (Estimated Share Price)
'85               $11.43                              $97
'86               $17.65                              $97
'87               $14.96                              $95.27
'88               $17.31                              $97.13
'89               $22.16                              $96.66
'90               $22.22                              $97.52
'91               $26.9                               $98.97
'92               $29.534                             $100.179
'93               $37.292                             $100.874
'94               $32.981                             $101.78
'95               $46.864                             $101.788
'96               $42.474                             $102.529
'97               $49.16                              $103.4
'98               $53.48                              $104.67
'99
'00
'01
'02
'03
'04
'05
'06
'07
'08
'09
'10

The top line in the graph  represents the fund's  Anticipated  Value at Maturity
(AVM--defined  on page 45), which fluctuates from day to day based on the fund's
expected  maturity date. The bottom line represents the fund's  historical share
price, which is managed to grow over time to reach the fund's AVM.

While this graph  demonstrates  the fund's  expected  long-term  growth pattern,
please  keep in mind  that  the  fund  may  experience  significant  share-price
volatility over the short term.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


14      TARGET MATURITIES TRUST: 2010          AMERICAN CENTURY INVESTMENTS


                         TARGET MATURITIES TRUST: 2010

THE CHARTS BELOW SHOW THE FUND'S STRIPS HOLDINGS  INCREASED  SUBSTANTIALLY.  WHY
THE CHANGE?

    The increase in STRIPS was largely cash-flow related.  Fund assets grew from
about $125 million to around $184  million over the last six months.  While some
of that  increase was from  appreciation,  the vast majority was from new money.
STRIPS are the most liquid  zero-coupon  bonds (the easiest to buy and sell), so
we used them to help meet cash flow needs.

    One of the things we do to keep turnover and  transaction  costs down is use
cash inflows and outflows as  opportunities to adjust the portfolio and maturity
date.  The most  recent six months were no  different.  We used the new money to
increase  our position in November  2010 STRIPS,  which went from 10% to about a
quarter  of  assets  during  the  six-month  period.  Buying  those  longer-term
securities extended Target: 2010's weighted average maturity date from October 3
to October 7, 2010,  moving it a little closer to the November 15, 2010 maturity
of the benchmark.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

    While it's  possible  rates  could go lower,  we think the  majority  of the
decline in yields is already  behind us. In our opinion,  economic  growth would
have to slow  significantly  to get  bond  prices  moving  higher  again,  and a
slowdown of that  magnitude  doesn't  seem likely in the near  future.  Analysts
thought  slower  demand  from Asia  would put the brakes on the  economy,  but a
robust consumer sector has kept growth strong. Continued economic strength helps
establish  a floor on how low  interest  rates can  go--the  Federal  Reserve is
reluctant  to lower  short-term  interest  rates as long as the economy  remains
robust and there's at least the threat of inflation from higher wages.

WHAT ARE YOUR PLANS FOR THE FUND GOING FORWARD?

    We manage Target:  2010 to deliver a pure play on zero-coupon bonds,  giving
shareholders  the total return and interest rate  sensitivity of a zero maturing
November 15, 2010.  While there's no assurance that Target:  2010 will reach its
anticipated value at maturity, we'll manage the portfolio to try to meet or beat
that value. To do that, we'll continue to work to move the average maturity date
closer to that of the benchmark. We'll also try to keep turnover and transaction
costs down by using cash  inflows and  outflows as  opportunities  to adjust the
portfolio's  composition  and weighted  average  maturity date.  We're likely to
continue to use STRIPS to meet liquidity needs,  while we'll look for additional
yield in other types of zeros.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
STRIPS             59%
REFCORPs           33%
ETRs                8%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
STRIPS             48%
REFCORPs           41%
ETRs               11%


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2010       15


                            SCHEDULE OF INVESTMENTS
                         TARGET MATURITIES TRUST: 2010

MARCH 31, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

ZERO-COUPON U.S. TREASURY SECURITIES(1)

                $28,520,000  ETR, 7.11%, 5/15/09                 $   14,556,168

                  2,000,000  REFCORP STRIPS -- COUPON,
                                 7.98%, 10/15/09                      1,001,502

                 11,500,000  STRIPS -- PRINCIPAL, 7.18%,
                                 11/15/09                             5,775,453

                  8,772,000  REFCORP STRIPS -- COUPON,
                                 7.30%, 1/15/10                       4,324,365

                 34,728,000  REFCORP STRIPS -- COUPON,
                                 7.18%, 4/15/10                      16,837,225

                  2,587,000  STRIPS -- COUPON, 6.80%,
                                 5/15/10                              1,267,244

                 15,000,000  REFCORP STRIPS -- COUPON,
                                 7.89%, 7/15/10                       7,146,202

                 29,277,000  STRIPS -- COUPON, 6.50%,
                                 8/15/10                             14,094,460

                 26,000,000  REFCORP STRIPS -- COUPON,
                                 6.86%, 10/15/10                     12,187,663

                 91,700,000  STRIPS -- COUPON, 6.71%,
                                 11/15/10                            43,456,223

                 20,500,000  REFCORP STRIPS -- COUPON,
                                 6.28%, 1/15/11                       9,452,775

                 40,360,000  STRIPS -- COUPON, 7.91%,
                                 2/15/11                             18,817,442

                 18,850,000  REFCORP STRIPS -- COUPON,
                                 7.84%, 4/15/11                       8,562,238

                 14,000,000  STRIPS -- COUPON, 6.32%,
                                 5/15/11                              6,432,943

                 11,715,000  STRIPS -- COUPON, 7.23%,
                                 8/15/11                              5,299,085

                 30,000,000  STRIPS -- COUPON, 6.56%,
                                 11/15/11                            13,364,717
                                                             -------------------

TOTAL INVESTMENT SECURITIES--100.0%                                $182,575,705
                                                             ===================
    (Cost $163,868,666)

NOTES TO SCHEDULE OF INVESTMENTS

ETR = Easy Growth Treasury Receipts

REFCORP = Resolution Funding Corporation

STRIPS = Separate Trading of Registered Interest and Principal of Securities

(1)  Rates indicated are the yield to maturity at purchase. These securities are
     purchased at a substantial discount from their value at maturity.

See Notes to Financial Statements


16      TARGET MATURITIES TRUST: 2010          AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                         TARGET MATURITIES TRUST: 2015

                                                                                AVERAGE ANNUAL RETURNS
                                     6 MONTHS         1 YEAR           3 YEARS         5 YEARS          10 YEARS
- -----------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998*

<S>                                    <C>             <C>             <C>             <C>               <C>   
Target Maturities Trust: 2015 ........ 12.34%          33.47%          18.08%          13.08%            13.72%

11/15/15 Maturity
STRIPS Issue ......................... 12.68%          34.42%          18.82%          13.66%            14.20%

Merrill Lynch Long-Term
Treasury Index .......................  8.03%          20.49%          12.44%            8.96%           10.78%
</TABLE>

* Returns for periods less than one year are not annualized.

See pages 44-45 for more information  about returns,  the comparative  index and
the fund's benchmark.

[mountain graph - data below]

Growth of $10,000 Over Ten Years
$10,000 investment made 3/31/88

                                   Value on 3/31/98
                                       11/15/15           Merrill Lynch
                Target: 2015         STRIPS Issue        Long-Term Index
Mar-88             $10,000              $10,000              $10,000
Apr-88             $9,395               $9,501               $9,839
May-88             $8,934               $8,850               $9,666
Jun-88             $9,782               $9,823               $10,074
Jul-88             $9,093               $8,981               $9,883
Aug-88             $8,976               $8,962               $9,921
Sep-88             $9,840               $9,887               $10,296
Oct-88             $10,638              $10,711              $10,599
Nov-88             $9,941               $10,008              $10,367
Dec-88             $10,605              $10,478              $10,499
Jan-89             $10,957              $11,142              $10,711
Feb-89             $10,453              $10,520              $10,496
Mar-89             $10,747              $10,789              $10,607
Apr-89             $10,966              $11,084              $10,856
May-89             $11,965              $12,023              $11,288
Jun-89             $13,694              $13,845              $11,928
Jul-89             $13,904              $14,079              $12,200
Aug-89             $13,157              $13,273              $11,876
Sep-89             $13,115              $13,291              $11,921
Oct-89             $14,047              $14,465              $12,399
Nov-89             $14,374              $14,593              $12,500
Dec-89             $14,156              $14,358              $12,483
Jan-90             $12,771              $13,030              $12,057
Feb-90             $12,594              $12,699              $12,005
Mar-90             $12,309              $12,445              $11,974
Apr-90             $11,318              $11,450              $11,667
May-90             $12,653              $12,748              $12,211
Jun-90             $13,149              $13,344              $12,490
Jul-90             $13,157              $13,343              $12,618
Aug-90             $11,411              $11,513              $12,072
Sep-90             $11,545              $11,675              $12,227
Oct-90             $12,007              $12,259              $12,499
Nov-90             $13,266              $13,457              $13,018
Dec-90             $13,678              $13,814              $13,289
Jan-91             $13,955              $14,144              $13,439
Feb-91             $13,837              $14,099              $13,492
Mar-91             $13,854              $14,092              $13,536
Apr-91             $14,089              $14,430              $13,715
May-91             $13,887              $14,029              $13,714
Jun-91             $13,468              $13,664              $13,606
Jul-91             $13,770              $14,061              $13,805
Aug-91             $14,777              $14,935              $14,287
Sep-91             $15,483              $15,716              $14,733
Oct-91             $15,239              $15,462              $14,781
Nov-91             $14,920              $15,068              $14,852
Dec-91             $16,751              $16,944              $15,738
Jan-92             $15,802              $15,962              $15,227
Feb-92             $15,995              $16,171              $15,335
Mar-92             $15,693              $15,847              $15,166
Apr-92             $15,374              $15,562              $15,172
May-92             $16,129              $16,349              $15,571
Jun-92             $16,020              $16,208              $15,794
Jul-92             $17,330              $17,571              $16,439
Aug-92             $17,145              $17,375              $16,578
Sep-92             $17,120              $17,371              $16,833
Oct-92             $16,650              $16,876              $16,498
Nov-92             $17,330              $17,564              $16,548
Dec-92             $18,052              $18,315              $16,988
Jan-93             $18,673              $18,962              $17,491
Feb-93             $19,731              $20,057              $18,071
Mar-93             $19,555              $19,887              $18,120
Apr-93             $19,723              $20,053              $18,252
May-93             $20,143              $20,476              $18,320
Jun-93             $21,570              $21,945              $19,090
Jul-93             $22,678              $23,094              $19,384
Aug-93             $24,593              $25,102              $20,162
Sep-93             $24,383              $24,889              $20,251
Oct-93             $24,819              $25,343              $20,376
Nov-93             $23,711              $24,172              $19,857
Dec-93             $23,560              $24,082              $19,916
Jan-94             $24,517              $25,080              $20,400
Feb-94             $22,704              $23,229              $19,548
Mar-94             $21,251              $21,679              $18,750
Apr-94             $20,722              $21,161              $18,462
May-94             $20,109              $20,545              $18,373
Jun-94             $19,715              $20,131              $18,208
Jul-94             $21,083              $21,564              $18,783
Aug-94             $20,369              $20,822              $18,667
Sep-94             $19,135              $19,518              $18,101
Oct-94             $19,068              $19,455              $18,021
Nov-94             $19,563              $19,964              $18,117
Dec-94             $20,243              $20,690              $18,435
Jan-95             $21,016              $21,533              $18,906
Feb-95             $21,587              $22,075              $19,437
Mar-95             $21,965              $22,486              $19,578
Apr-95             $22,376              $22,978              $19,923
May-95             $25,634              $26,380              $21,464
Jun-95             $25,978              $26,713              $21,723
Jul-95             $25,088              $25,811              $21,384
Aug-95             $26,247              $27,026              $21,845
Sep-95             $27,036              $27,843              $22,239
Oct-95             $28,480              $29,399              $22,894
Nov-95             $29,555              $30,455              $23,455
Dec-95             $30,915              $31,873              $24,089
Jan-96             $30,554              $31,502              $24,076
Feb-96             $27,716              $28,641              $22,901
Mar-96             $26,641              $27,532              $22,465
Apr-96             $25,819              $26,657              $22,090
May-96             $25,760              $26,619              $21,984
Jun-96             $26,566              $27,528              $22,430
Jul-96             $26,574              $27,448              $22,430
Aug-96             $25,684              $26,555              $22,157
Sep-96             $26,835              $27,827              $22,764
Oct-96             $28,622              $29,747              $23,651
Nov-96             $30,360              $31,368              $24,428
Dec-96             $29,051              $30,086              $23,850
Jan-97             $28,429              $29,500              $23,695
Feb-97             $28,429              $29,443              $23,663
Mar-97             $27,093              $28,063              $23,100
Apr-97             $28,101              $29,102              $23,662
May-97             $28,478              $29,639              $23,915
Jun-97             $29,343              $30,567              $24,367
Jul-97             $32,424              $33,649              $25,776
Aug-97             $30,703              $31,921              $25,057
Sep-97             $32,189              $33,477              $25,761
Oct-97             $33,901              $35,226              $26,609
Nov-97             $34,732              $36,154              $26,958
Dec-97             $35,704              $37,171              $27,413
Jan-98             $36,500              $38,011              $27,956
Feb-98             $36,062              $37,532              $27,760
Mar-98             $36,163              $37,723              $27,830

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction costs and management fees) that reduce returns, while the index's
total return line does not.


PORTFOLIO AT A GLANCE
                                     3/31/98           9/30/97
Number of Securities                    12                11
Anticipated Growth Rate                5.52%             5.93%
Weighted Average Maturity Date       11/18/15          11/17/15
Anticipated Value at Maturity
   (AVM--see graph on next page)      $112.49           $110.52
Expense Ratio                         0.60%*             0.61%

* Annualized.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2015       17


                         TARGET MATURITIES TRUST: 2015

MANAGEMENT Q & A

    An  interview  with  Dave  Schroeder,  a  portfolio  manager  on the  Target
Maturities Trust investment team.

HOW DID THE FUND PERFORM OVER THE LAST SIX MONTHS?

    Target:  2015 performed  well,  producing a 12.34% return for the six months
ended March 31,  1998.  For the year ended in March,  the fund  returned a hefty
33.47%.  The fund's excellent returns are a product of lower interest rates (see
the Market Perspective on page 4).

    Target:  2015 slightly  underperformed  its  benchmark,  a November 15, 2015
STRIPS issue,  which returned 12.68% for the six months and 34.42% for the year.
However,  fund returns are reduced by management expenses and transaction costs,
while the benchmark's are not. (See the Total Returns table on the previous page
for other fund performance comparisons.)

TARGET:  2015'S ANTICIPATED VALUE AT MATURITY (AVM) INCREASED BY $1.97 (SEE PAGE
17). WHY?

    The  higher  AVM is  largely  a result  of the new,  unified  fee  structure
shareholders  approved last summer. We approximate the fund's anticipated growth
rate and value at  maturity  each day, so  shareholders  have an idea what their
investment  should  return if they hold their shares to the maturity  date.  But
that calculation assumes that the expense ratio and portfolio composition remain
constant over the life of the fund. In the past, our AVM  calculation  was based
on the old expense cap of 0.70%,  though

Target: 2015's Share Price vs. Anticipated Value at Maturity

             Actual Share Price            Anticipated Value at Maturity
               (Historical)                   (Estimated Share Price)
'86               $14.24                              $101
'87               $11.37                              $102.86
'88               $12.63                              $102.75
'89               $16.86                              $101.77
'90               $16.29                              $102.24
'91               $19.95                              $106.05
'92               $21.502                             $107.792
'93               $28.064                             $106.952
'94               $24.11                              $108.832
'95               $36.819                             $109.462
'96               $31.962                             $110.109
'97               $38.34                              $110.52
'98               $43.07                              $112.49
'99
'00
'01
'02
'03
'04
'05
'06
'07
'08
'09
'10
'11
'12
'13
'14
'15

The top line in the graph  represents the fund's  Anticipated  Value at Maturity
(AVM--defined  on page 45), which fluctuates from day to day based on the fund's
expected  maturity date. The bottom line represents the fund's  historical share
price, which is managed to grow over time to reach the fund's AVM.

While this graph  demonstrates  the fund's  expected  long-term  growth pattern,
please  keep in mind  that  the  fund  may  experience  significant  share-price
volatility over the short term.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


18      TARGET MATURITIES TRUST: 2015          AMERICAN CENTURY INVESTMENTS


                         TARGET MATURITIES TRUST: 2015

actual  fund  expenses  varied.  Lowering  the  assumption  for  expenses in our
calculation to 0.60%--the fund's current management  fee--caused the anticipated
value at maturity to rise.

DID YOU MAKE ANY CHANGES TO THE PORTFOLIO?

    We increased the fund's holdings of November 2015 STRIPS,  which helped keep
the weighted  average  maturity date close to that of the benchmark.  The change
was largely  cash-flow  related--assets  grew from around $115  million to about
$145 million.  Because STRIPS are the most liquid zero-coupon bonds (the easiest
to buy and sell),  we used them to put the new money to work quickly.  The other
reason we bought  STRIPS is that in this area of the  zero-coupon  yield  curve,
REFCORP  yields  aren't  significantly  higher than STRIPS  yields.  And because
REFCORPs tend to be less liquid than STRIPS,  it generally doesn't make sense to
buy REFCORPs unless we can find them at very attractive yields.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

    While it's  possible  rates  could go lower,  we think the  majority  of the
decline in yields is already  behind us. In our opinion,  economic  growth would
have to slow  significantly  to get  bond  prices  moving  higher  again,  and a
slowdown of that  magnitude  doesn't  seem likely in the near  future.  Analysts
thought  slower  demand  from Asia  would put the brakes on the  economy,  but a
robust consumer sector has kept growth strong. Continued economic strength helps
establish  a floor on how low  interest  rates can  go--the  Federal  Reserve is
reluctant  to lower  short-term  interest  rates as long as the economy  remains
robust and there's also the threat of inflation from higher wages.

WHAT ARE YOUR PLANS FOR THE FUND GOING FORWARD?

    We manage Target:  2015 to deliver a pure play on zero-coupon bonds,  giving
shareholders  the total return and interest rate  sensitivity of a zero maturing
November 15, 2015.  While there's no assurance that Target:  2015 will reach its
anticipated value at maturity, we'll manage the portfolio to try to meet or beat
that value. To do that, we'll continue to work to keep the average maturity date
close to that of the benchmark.  We'll also try to keep turnover and transaction
costs down by using cash  inflows and  outflows as  opportunities  to adjust the
fund's  composition and weighted average maturity date. We're likely to continue
to use STRIPS to meet liquidity needs,  while we'll look for additional yield in
other types of zeros.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
STRIPS             56%
REFCORPs           44%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
STRIPS             50%
REFCORPs           50%


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2015       19


                            SCHEDULE OF INVESTMENTS
                         TARGET MATURITIES TRUST: 2015

MARCH 31, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

ZERO-COUPON U.S. TREASURY SECURITIES(1)

               $  9,350,000  STRIPS -- COUPON, 7.52%,
                                 2/15/15                        $     3,402,877

                 39,440,000  REFCORP STRIPS -- COUPON,
                                 8.21%, 4/15/15                      13,912,484

                 43,408,000  STRIPS -- COUPON, 8.88%,
                                 5/15/15                             15,567,154

                 29,644,000  REFCORP STRIPS -- COUPON,
                                 8.55%, 7/15/15                      10,297,277

                 35,050,000  STRIPS -- COUPON, 9.17%,
                                 8/15/15                             12,379,890

                 48,421,000  REFCORP STRIPS -- COUPON,
                                 8.38%, 10/15/15                     16,566,158

                 77,808,000  STRIPS -- COUPON, 7.63%,
                                 11/15/15                            27,080,574

                 36,300,000  STRIPS -- COUPON, 8.38%,
                                 2/15/16                             12,443,127

                 17,700,000  STRIPS -- COUPON, 8.39%,
                                 5/15/16                              5,973,366

                 46,500,000  REFCORP STRIPS -- COUPON,
                                 7.67%, 7/15/16                      15,180,773

                 25,500,000  REFCORP STRIPS -- COUPON,
                                 8.18%, 10/15/16                      8,199,330

                 12,000,000  STRIPS -- COUPON, 5.91%,
                                 11/15/16                             3,930,165
                                                              ------------------

TOTAL INVESTMENT SECURITIES--100.0%                                $144,933,175
                                                              ==================
   (Cost $103,796,839)

NOTES TO SCHEDULE OF INVESTMENTS

REFCORP = Resolution Funding Corporation

STRIPS = Separate Trading of Registered Interest and Principal of Securities

(1)  Rates indicated are the yield to maturity at purchase. These securities are
     purchased at a substantial discount from their value at maturity.

See Notes to Financial Statements


20      TARGET MATURITIES TRUST: 2015          AMERICAN CENTURY INVESTMENTS

<TABLE>
<CAPTION>
                         TARGET MATURITIES TRUST: 2020

                                                                                 AVERAGE ANNUAL RETURNS
                                      6 MONTHS         1 YEAR           3 YEARS         5 YEARS     LIFE OF FUND(2)
- ---------------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998(1)

<S>                                    <C>              <C>             <C>             <C>           <C>   
Target Maturities Trust: 2020 .......  15.27%           41.66%          20.91%          14.33%        12.33%

Fund Benchmark(3) ...................  15.52%           42.60%          21.74%          14.75%        11.81%(4)

Merrill Lynch Long-Term
Treasury Index ......................   8.03%           20.49%          12.44%            8.96%       9.18%(4)
</TABLE>

(1)  Returns for periods less than one year are not annualized.

(2)  Inception date was December 29, 1989.

(3)  From December 1989 through April 1990, the fund's  benchmark was an 8/15/19
     STRIPS issue; from May 1990 through October 1991, it was an 11/15/19 STRIPS
     issue;  and from  November  1991 to the  present,  it has been an  11/15/20
     STRIPS issue.

(4)  Returns since December 31, 1989, the date nearest the fund's  inception for
     which data are available.

See pages 44-45 for more information  about returns,  the comparative  index and
the fund's benchmark.

[mountain graph - data below]

Growth of 10,000 Over Life of Fund
$10,000 investment made 12/31/89*

                                  Value on 3/31/98
                                        Fund              Merrill Lynch
                Target: 2020          Benchmark          Long-Term Index
Dec-89             $10,000             $10,000              $10,000
Jan-90             $9,083              $9,063               $9,659
Feb-90             $8,767              $8,518               $9,617
Mar-90             $8,658              $8,407               $9,593
Apr-90             $7,967              $7,781               $9,346
May-90             $8,917              $8,351               $9,783
Jun-90             $9,258              $8,818               $10,006
Jul-90             $9,308              $9,237               $10,108
Aug-90             $7,950              $7,837               $9,671
Sep-90             $8,025              $7,976               $9,795
Oct-90             $8,458              $8,356               $10,013
Nov-90             $9,275              $8,845               $10,429
Dec-90             $9,550              $9,080               $10,646
Jan-91             $9,800              $9,373               $10,766
Feb-91             $9,850              $9,275               $10,809
Mar-91             $9,717              $9,257               $10,844
Apr-91             $9,808              $9,399               $10,987
May-91             $9,633              $9,133               $10,986
Jun-91             $9,208              $8,774               $10,900
Jul-91             $9,458              $9,058               $11,059
Aug-91             $10,117             $9,601               $11,446
Sep-91             $10,450             $10,012              $11,803
Oct-91             $10,117             $9,551               $11,841
Nov-91             $9,792              $9,257               $11,898
Dec-91             $11,208             $10,623              $12,608
Jan-92             $10,558             $10,005              $12,199
Feb-92             $10,742             $10,094              $12,285
Mar-92             $10,592             $9,970               $12,150
Apr-92             $10,408             $9,818               $12,154
May-92             $10,942             $10,295              $12,474
Jun-92             $10,842             $10,226              $12,653
Jul-92             $11,708             $11,110              $13,170
Aug-92             $11,533             $10,884              $13,281
Sep-92             $11,358             $10,690              $13,485
Oct-92             $10,925             $10,305              $13,217
Nov-92             $11,508             $10,861              $13,257
Dec-92             $12,142             $11,474              $13,609
Jan-93             $12,675             $11,985              $14,013
Feb-93             $13,383             $12,716              $14,477
Mar-93             $13,358             $12,631              $14,516
Apr-93             $13,300             $12,608              $14,622
May-93             $13,708             $12,951              $14,676
Jun-93             $14,692             $13,854              $15,293
Jul-93             $15,775             $14,963              $15,529
Aug-93             $17,542             $16,680              $16,152
Sep-93             $17,267             $16,421              $16,223
Oct-93             $17,583             $16,769              $16,324
Nov-93             $16,625             $15,862              $15,907
Dec-93             $16,467             $15,625              $15,955
Jan-94             $17,100             $16,254              $16,342
Feb-94             $15,800             $14,984              $15,660
Mar-94             $14,508             $13,672              $15,021
Apr-94             $14,142             $13,354              $14,790
May-94             $13,750             $12,955              $14,719
Jun-94             $13,375             $12,613              $14,587
Jul-94             $14,417             $13,623              $15,048
Aug-94             $13,767             $12,992              $14,954
Sep-94             $12,733             $11,974              $14,501
Oct-94             $12,608             $11,832              $14,437
Nov-94             $12,992             $12,212              $14,513
Dec-94             $13,558             $12,775              $14,768
Jan-95             $14,175             $13,401              $15,146
Feb-95             $14,533             $13,750              $15,571
Mar-95             $14,767             $13,925              $15,684
Apr-95             $15,075             $14,250              $15,961
May-95             $17,642             $16,707              $17,195
Jun-95             $17,933             $17,009              $17,402
Jul-95             $17,117             $16,274              $17,131
Aug-95             $18,008             $17,105              $17,500
Sep-95             $18,725             $17,816              $17,816
Oct-95             $19,917             $18,972              $18,340
Nov-95             $20,667             $19,659              $18,790
Dec-95             $21,875             $20,861              $19,298
Jan-96             $21,492             $20,480              $19,288
Feb-96             $19,067             $18,155              $18,347
Mar-96             $18,242             $17,378              $17,997
Apr-96             $17,583             $16,761              $17,697
May-96             $17,608             $16,824              $17,612
Jun-96             $18,133             $17,361              $17,969
Jul-96             $18,150             $17,391              $17,969
Aug-96             $17,450             $16,655              $17,750
Sep-96             $18,333             $17,558              $18,236
Oct-96             $19,741             $19,071              $18,947
Nov-96             $21,107             $20,130              $19,570
Dec-96             $20,033             $19,111              $19,107
Jan-97             $19,408             $18,529              $18,983
Feb-97             $19,415             $18,543              $18,957
Mar-97             $18,423             $17,620              $18,506
Apr-97             $19,265             $18,424              $18,956
May-97             $19,573             $18,742              $19,159
Jun-97             $20,264             $19,504              $19,520
Jul-97             $22,964             $21,958              $20,649
Aug-97             $21,464             $20,593              $20,073
Sep-97             $22,638             $21,752              $20,648
Oct-97             $24,080             $23,179              $20,648
Nov-97             $24,981             $24,036              $20,648
Dec-97             $25,765             $24,758              $20,648
Jan-98             $26,347             $25,385              $20,648
Feb-98             $26,039             $25,055              $20,648
Mar-98             $26,100             $25,127              $20,648

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction costs and management fees) that reduce returns, while the index's
total return line does not.

*  12/31/89  is the date  nearest  the  fund's  inception  for which  comparable
performance data exist. The fund's actual inception date is 12/29/89.

PORTFOLIO AT A GLANCE
                                     3/31/98           9/30/97
Number of Securities                   15                15
Anticipated Growth Rate               5.56%             5.98%
Weighted Average Maturity Date       9/09/20           9/01/20
Anticipated Value at Maturity
   (AVM--see graph on next page)     $107.16           $104.84
Expense Ratio                        0.60%*             0.53%

* Annualized.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2020       21


                         TARGET MATURITIES TRUST: 2020

MANAGEMENT Q & A

    An  interview  with  Dave  Schroeder,  a  portfolio  manager  on the  Target
Maturities Trust investment team.

HOW DID THE FUND PERFORM OVER THE LAST SIX MONTHS?

    Target:  2020  performed  very well,  producing a 15.27%  return for the six
months  ended March 31,  1998.  For the year ended in March,  the fund  returned
41.66%. The fund's benchmark,  a November 15, 2020 STRIPS issue, returned 15.52%
for the six months and 42.60% for the year. However, fund returns are reduced by
management  expenses  and  transaction  costs,  while the  benchmark's  are not.
Nevertheless,   since  its  inception  in  December  1989,   Target:   2020  has
outperformed  its  benchmark  by more than half a  percentage  point  even after
expenses.  (See the Total  Returns  table on the  previous  page for other  fund
performance comparisons.)

CAN YOU EXPLAIN HOW TARGET: 2020 MANAGED TO PRODUCE THOSE STOCK-LIKE RETURNS?

    Those  impressive  returns  are a product of the recent  decline in interest
rates.  Long-term  zero-coupon  bonds  and  funds  that buy  them are  extremely
sensitive to rate changes--their  prices rise faster than interest-paying  bonds
when rates fall, but zeros also suffer more price  depreciation than other bonds
when rates  rise.  That means zeros can be a great asset to own when the outlook
for inflation is good and nominal interest rates are falling, which was the case
over the last year or so (see the Market  Perspective  on page 4). The potential
for huge returns  explains why a  high-profile  equity  investor  such as Warren
Buffett was such a big buyer of long-term zeros during the last year.

[line graph - data below]

Target: 2020's Share Price vs. Anticipated Value at Maturity

             Actual Share Price            Anticipated Value at Maturity
               (Historical)                   (Estimated Share Price)
'90               $11.46                              $92.6
'91               $13.45                              $97.77
'92               $14.575                             $102.184
'93               $19.765                             $101.274
'94               $16.273                             $102.175
'95               $26.245                             $102.54
'96               $22                                 $103.598
'97               $27.17                              $104.84
'98               $31.32                              $107.16
'99
'00
'01
'02
'03
'04
'05
'06
'07
'08
'09
'10
'11
'12
'13
'14
'15
'16
'17
'18
'19
'20

The top line in the graph  represents the fund's  Anticipated  Value at Maturity
(AVM--defined  on page 45), which fluctuates from day to day based on the fund's
expected  maturity date. The bottom line represents the fund's  historical share
price, which is managed to grow over time to reach the fund's AVM.

While this graph  demonstrates  the fund's  expected  long-term  growth pattern,
please  keep in mind  that  the  fund  may  experience  significant  share-price
volatility over the short term.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


22      TARGET MATURITIES TRUST: 2020          AMERICAN CENTURY INVESTMENTS


                         TARGET MATURITIES TRUST: 2020

TARGET:  2020'S ANTICIPATED VALUE AT MATURITY (AVM) INCREASED BY $2.32 (SEE PAGE
21). WHY?

    The higher AVM is a result of the new,  unified fee  structure  shareholders
approved last summer.  We  approximate  the fund's  anticipated  growth rate and
value at maturity each day, so shareholders  have an idea what their  investment
should  return  if they  hold  their  shares  to the  maturity  date.  But  that
calculation  assumes that the expense  ratio and  portfolio  composition  remain
constant over the life of the fund. In the past, our AVM  calculation  was based
on the old expense cap of 0.70%,  though actual fund expenses  varied.  Lowering
the  assumption  for expenses in our  calculation  to 0.60%--the  fund's current
management  fee--caused the  anticipated  value at maturity to rise. The size of
the increase is a good illustration of the power of compounding.  In a fund that
has  only a few  years to run,  such as  Target:  2000,  the  revision  meant an
increase of $0.36 to the approximated ending share price. But in this fund, with
more than 20 years to run, it works out to a gain of $2.32.

THE FUND'S REFCORP HOLDINGS FELL. WHY THE CHANGE?

    We  sold  some  of  our   shorter-maturity   REFCORPs  to  meet  shareholder
redemptions.  The portfolio's  weighted  average  maturity date was in September
2020,  compared  with a  mid-November  maturity for our  benchmark.  Selling our
longer-term  securities  would have shortened our maturity and hurt  performance
relative to the benchmark. We also attempted to limit our year-end capital gains
distribution  by selling our highest cost tax lots. As a result,  we reduced our
holdings of July 2020 REFCORPs from about 20% of assets last September to around
13% by March.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

    While it's  possible  rates  could go lower,  we think the  majority  of the
decline in yields is already behind us, so investors  shouldn't  expect a repeat
of the 40%-plus  return of the last year. In our opinion,  economic growth would
have to slow  significantly  to get  bond  prices  moving  higher  again,  and a
slowdown of that  magnitude  doesn't  seem likely in the near  future.  Analysts
thought  slower  demand  from Asia  would put the brakes on the  economy,  but a
robust consumer sector has kept growth strong. Continued economic strength helps
establish  a floor on how low  interest  rates can  go--the  Federal  Reserve is
reluctant  to lower  short-term  interest  rates as long as the economy  remains
robust and there's also the threat of inflation from higher wages.

WHAT ARE YOUR PLANS FOR THE FUND GOING FORWARD?

    We manage Target:  2020 to deliver a pure play on zero-coupon bonds,  giving
shareholders  the total return and interest rate  sensitivity of a zero maturing
November 15, 2020.  While there's no assurance that Target:  2020 will reach its
anticipated value at maturity, we'll manage the fund to try to meet or beat that
value.  To do that,  we'll  continue to work to move the average  maturity  date
closer  to  that  of  the   benchmark,   using  cash  inflows  and  outflows  as
opportunities  to adjust the  portfolio.  We're also  likely to  continue to use
STRIPS to meet liquidity needs.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
REFCORPs          55%
STRIPS            45%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
REFCORPs          63%
STRIPS            37%


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2020       23


                            SCHEDULE OF INVESTMENTS
                         TARGET MATURITIES TRUST: 2020

MARCH 31, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

ZERO-COUPON U.S. TREASURY SECURITIES(1)

              $  57,823,000  REFCORP STRIPS -- COUPON,
                                 8.49%, 1/15/20                   $  15,173,097

                240,000,000  STRIPS -- COUPON, 7.96%,
                                 2/15/20                             64,399,491

                 38,344,000  REFCORP STRIPS -- COUPON,
                                 7.64%, 4/15/20                       9,909,399

                 70,500,000  STRIPS -- COUPON, 8.38%,
                                 5/15/20                             18,639,715

                 59,400,000  REFCORP STRIPS -- COUPON,
                                 8.16%, 7/15/20                      15,115,680

                291,000,000  REFCORP STRIPS -- PRINCIPAL,
                                 8.27%, 7/15/20                      74,051,562

                247,135,000  STRIPS -- COUPON, 7.47%,
                                 8/15/20                             64,349,757

                 16,165,000  REFCORP STRIPS -- COUPON,
                                 7.23%, 10/15/20                      4,051,289

                436,000,000  REFCORP STRIPS -- PRINCIPAL,
                                 7.38%, 10/15/20                    109,270,777

                249,407,000  STRIPS -- COUPON, 7.53%,
                                 11/15/20                            63,988,252

                 20,482,000  REFCORP STRIPS -- COUPON,
                                 8.41%, 1/15/21                       5,054,535

                294,945,000  REFCORP STRIPS -- PRINCIPAL,
                                 7.32%, 1/15/21                      72,786,343

                 88,250,000  STRIPS -- COUPON, 7.19%,
                                 2/15/21                             22,298,150

                 61,500,000  STRIPS -- COUPON, 6.52%,
                                 5/15/21                             15,276,850

                 14,500,000  STRIPS -- COUPON, 7.40%,
                                 11/15/21                             3,494,999
                                                             -------------------

TOTAL INVESTMENT SECURITIES--100.0%                                $557,859,896
                                                             ===================
    (Cost $408,803,791)

NOTES TO SCHEDULE OF INVESTMENTS

REFCORP = Resolution Funding Corporation

STRIPS = Separate Trading of Registered Interest and Principal of Securities

(1)  Rates indicated are the yield to maturity at purchase. These securities are
     purchased at a substantial discount from their value at maturity.

See Notes to Financial Statements


24      TARGET MATURITIES TRUST: 2020          AMERICAN CENTURY INVESTMENTS

<TABLE>
<CAPTION>
                         TARGET MATURITIES TRUST: 2025

                                        6 MONTHS         1 YEAR        LIFE OF FUND(2)
- --------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998(1)

<S>                                       <C>             <C>              <C>   
Target Maturities Trust: 2025 ..........  16.48%          47.14%           13.45%

Fund Benchmark(3) ......................  17.59%          47.14%           10.80%

Merrill Lynch Long-Term
Treasury Index .........................  8.03%           20.49%            7.79%
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) Inception date was February 15, 1996.

(3)  The fund's  benchmark was an 8/15/25  STRIPS issue from  inception  through
     January 1998, when the benchmark was changed to an 11/15/25 STRIPS issue.

See pages 44-45 for more information  about returns,  the comparative  index and
the fund's benchmark.


[mountain graph - data graph]

Growth of 10,000 Over Life of Fund
$10,000 investment made 2/15/96

                                  Value on 3/31/98
                                        Fund             Merrill Lynch
                Target: 2025          Benchmark         Long-Term Index
15-Feb             $10,000             $10,000             $10,000
Feb-96             $9,542              $9,308              $9,650
Mar-96             $9,124              $8,965              $9,466
Apr-96             $8,756              $8,354              $9,308
May-96             $8,746              $8,403              $9,263
Jun-96             $8,983              $8,713              $9,451
Jul-96             $8,968              $8,645              $9,451
Aug-96             $8,529              $8,198              $9,336
Sep-96             $9,023              $8,696              $9,591
Oct-96             $9,799              $9,456              $9,965
Nov-96             $10,540             $10,105             $10,293
Dec-96             $9,890              $9,455              $10,049
Jan-97             $9,492              $9,048              $9,984
Feb-97             $9,427              $8,946              $9,970
Mar-97             $8,883              $8,449              $9,733
Apr-97             $9,392              $8,854              $9,970
May-97             $9,558              $9,002              $10,077
Jun-97             $9,966              $9,432              $10,267
Jul-97             $11,463             $10,865             $10,861
Aug-97             $10,561             $9,989              $10,558
Sep-97             $11,221             $10,572             $10,855
Oct-97             $12,016             $11,370             $11,212
Nov-97             $12,419             $11,834             $11,359
Dec-97             $12,867             $12,218             $11,551
Jan-98             $13,246             $12,616             $11,779
Feb-98             $13,009             $12,336             $11,697
Mar-98             $13,068             $12,432             $11,726

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction costs and management fees) that reduce returns, while the index's
total return line does not.


PORTFOLIO AT A GLANCE
                                      3/31/98          9/30/97
Number of Securities                    19               14
Anticipated Growth Rate                5.48%            5.86%
Weighted Average Maturity Date        6/10/25          7/10/25
Anticipated Value at Maturity
   (AVM--see graph on next page)      $112.76          $110.88
Expense Ratio                         0.60%*            0.62%

* Annualized.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2025       25


                         TARGET MATURITIES TRUST: 2025

MANAGEMENT Q & A

    An  interview  with  Dave  Schroeder,  a  portfolio  manager  on the  Target
Maturities Trust investment team.

HOW DID THE FUND PERFORM OVER THE LAST SIX MONTHS?

    Target:  2025  performed  very well,  producing a 16.48%  return for the six
months  ended March 31,  1998.  For the year ended in March,  the fund  returned
47.14%. The fund's benchmark,* returned 17.59% for the six months and 47.14% for
the  year.  However,  fund  returns  are  reduced  by  management  expenses  and
transaction  costs,  while  the  benchmark's  are not.  Since its  inception  on
February 15, 1996,  Target:  2025 has  outperformed  its benchmark by 2.65% even
after expenses. (See the Total Returns table on the previous page for other fund
performance comparisons.)

CAN YOU EXPLAIN HOW TARGET: 2025 MANAGED TO PRODUCE THOSE STOCK-LIKE RETURNS?

    Those  impressive  returns  are a product of the recent  decline in interest
rates.  Long-term  zero-coupon  bonds  and  funds  that buy  them are  extremely
sensitive to rate changes--their  prices rise faster than interest-paying  bonds
when rates fall, but zeros also suffer more price  depreciation than other bonds
when rates  rise.  That means zeros can be a great asset to own when the outlook
for inflation is good and nominal interest rates are falling, which was the case
over the last year or so (see the Market  Perspective  on page 4). The potential
for huge returns  explains why a  high-profile  equity  investor  such as Warren
Buffett was such a big buyer of long-term zeros during the last year.

* The fund's  benchmark  was an 8/15/25  STRIPS  issue  from  inception  through
  January 1998, when the benchmark was changed to an 11/15/25 STRIPS issue.

[line graph - data below]

Target: 2025's Share Price vs. Anticipated Value at Maturity

             Actual Share Price            Anticipated Value at Maturity
               (Historical)                   (Estimated Share Price)
'96               $17.91                              $109.24
'97               $22.27                              $110.88
'98               $25.94                              $112.76
'99
'00
'01
'02
'03
'04
'05
'06
'07
'08
'09
'10
'11
'12
'13
'14
'15
'16
'17
'18
'19
'20
'21
'22
'23
'24
'25

The top line in the graph  represents the fund's  Anticipated  Value at Maturity
(AVM--defined  on page 45), which fluctuates from day to day based on the fund's
expected  maturity date. The bottom line represents the fund's  historical share
price, which is managed to grow over time to reach the fund's AVM.

While this graph  demonstrates  the fund's  expected  long-term  growth pattern,
please  keep in mind  that  the  fund  may  experience  significant  share-price
volatility over the short term.

Past performance is no guarantee of future results. Even if fund shares are held
to maturity,  there is no  guarantee  that the fund's share price will reach its
AVM.  There is also no  guarantee  that the AVM will  fluctuate as little in the
future  as it has  in  the  past.  For  more  information,  please  consult  the
prospectus.


26      TARGET MATURITIES TRUST: 2025          AMERICAN CENTURY INVESTMENTS


                         TARGET MATURITIES TRUST: 2025

TARGET:  2025'S ANTICIPATED VALUE AT MATURITY (AVM) INCREASED BY $1.88 (SEE PAGE
25). WHY?

    The higher AVM is a result of the new,  unified fee  structure  shareholders
approved last summer.  We  approximate  the fund's  anticipated  growth rate and
value at maturity each day, so shareholders  have an idea what their  investment
should  return  if they  hold  their  shares  to the  maturity  date.  But  that
calculation  assumes that the expense  ratio and  portfolio  composition  remain
constant over the life of the fund. In the past, our AVM  calculation  was based
on the old expense cap of 0.70%,  though actual fund expenses  varied.  Lowering
the  assumption  for expenses in our  calculation  to 0.60%--the  fund's current
management  fee--caused the  anticipated  value at maturity to rise. The size of
the increase is a good illustration of the power of compounding.  In a fund that
has  only a few  years to run,  such as  Target:  2000,  the  revision  meant an
increase of $0.36 to the approximated ending share price. But in this fund, with
more than 25 years to run,  it works  out to a gain of more  than five  times as
much.

REFCORPS DECLINED AS A PERCENT OF THE PORTFOLIO. WHY THE CHANGE?

    The fund's  assets  nearly  tripled,  going from $74  million to almost $206
million,  and we used that new money to buy STRIPS.  We used them to put the new
money to work quickly because STRIPS are the most liquid  zero-coupon bonds (the
easiest  to buy and  sell).  The  other  reason  we  bought  STRIPS  is that the
difference  in yield  between them and REFCORPs  narrowed at the long end of the
zero-coupon  yield curve.  When we opened Target:  2025 in 1996,  REFCORP yields
were 20 to 25 basis points  higher than STRIPS  yields.  But that premium is now
down to about 10 basis  points.  We don't think it makes  sense to buy  REFCORPs
unless we can find them at much more attractive yields.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

    While it's  possible  rates  could go lower,  we think the  majority  of the
decline in yields is already behind us, so investors  shouldn't  expect a repeat
of the 45%-plus  return of the last year. In our opinion,  economic growth would
have to slow  significantly  to get  bond  prices  moving  higher  again,  and a
slowdown of that  magnitude  doesn't  seem likely in the near  future.  Analysts
thought  slower  demand  from Asia  would put the brakes on the  economy,  but a
robust consumer sector has kept growth strong. Continued economic strength helps
establish  a floor on how low  interest  rates can  go--the  Federal  Reserve is
reluctant  to lower  short-term  interest  rates as long as the economy  remains
robust and there's also the threat of inflation from higher wages.

WHAT ARE YOUR PLANS FOR THE FUND GOING FORWARD?

    We manage Target:  2025 to deliver a pure play on zero-coupon bonds,  giving
shareholders  the total return and interest rate  sensitivity of a zero maturing
November  15,  2025.  While  there's no  assurance  Target:  2025 will reach its
anticipated value at maturity, we'll manage the fund to try to meet or beat that
value.  To do that,  we'll continue to work to move the fund's average  maturity
date  closer to that of the  benchmark,  using  cash  inflows  and  outflows  as
opportunities to adjust the portfolio.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
STRIPS             57%
REFCORPs           43%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
REFCORPs           63%
STRIPS             37%


SEMIANNUAL REPORT                     TARGET MATURITIES TRUST: 2025       27


                            SCHEDULE OF INVESTMENTS
                         TARGET MATURITIES TRUST: 2025

MARCH 31, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

ZERO-COUPON U.S. TREASURY SECURITIES(1)

              $  10,000,000  REFCORP STRIPS -- COUPON,
                                 6.19%, 1/15/24                 $     2,094,140

                 12,000,000  REFCORP STRIPS -- COUPON,
                                 6.50%, 4/15/24                       2,475,410

                  3,926,000  REFCORP STRIPS -- COUPON,
                                 7.10%, 7/15/24                         797,613

                 72,083,000  REFCORP STRIPS -- COUPON,
                                 6.83%, 10/15/24                     14,351,543

                 13,000,000  STRIPS -- COUPON, 7.27%,
                                 11/15/24                             2,663,172

                 17,500,000  STRIPS -- PRINCIPAL, 7.26%,
                                 11/15/24                             3,585,039

                 41,645,000  REFCORP STRIPS -- COUPON,
                                 6.93%, 1/15/25                       8,154,911

                156,900,000  STRIPS -- COUPON, 6.45%,
                                 2/15/25                             31,618,340

                275,300,000  STRIPS -- PRINCIPAL, 6.44%,
                                 2/15/25                             55,478,197

                 23,399,000  REFCORP STRIPS -- COUPON,
                                 7.00%, 4/15/25                       4,542,923

                  8,500,000  REFCORP STRIPS -- COUPON,
                                 6.95%, 7/15/25                       1,616,715

                 26,000,000  STRIPS -- COUPON, 6.05%,
                                 8/15/25                              5,092,416

                 73,000,000  STRIPS -- PRINCIPAL, 5.90%,
                                 8/15/25                             14,297,937

                 95,167,000  REFCORP STRIPS -- COUPON,
                                 6.79%, 10/15/25                     17,829,539

                 45,000,000  REFCORP STRIPS -- COUPON,
                                 6.81%, 1/15/26                       8,336,377

                 21,000,000  STRIPS -- PRINCIPAL, 5.99%,
                                 2/15/26                              4,008,671

                 43,000,000  REFCORP STRIPS -- COUPON,
                                 6.68%, 4/15/26                       7,911,016

                 36,000,000  REFCORP STRIPS -- COUPON,
                                 7.29%, 7/15/26                       6,523,324

                 80,042,000  REFCORP STRIPS -- COUPON,
                                 6.99%, 10/15/26                     14,287,971
                                                             -------------------

TOTAL INVESTMENT SECURITIES--100.0%                                $205,665,254
                                                             ===================
   (Cost $181,475,172)

NOTES TO SCHEDULE OF INVESTMENTS

REFCORP = Resolution Funding Corporation

STRIPS = Separate Trading of Registered Interest and Principal of Securities

(1)  Rates indicated are the yield to maturity at purchase. These securities are
     purchased at a substantial discount from their value at maturity.

See Notes to Financial Statements


28      TARGET MATURITIES TRUST: 2025          AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                     STATEMENTS OF ASSETS AND LIABILITIES


MARCH 31, 1998 (UNAUDITED)              2000             2005             2010            2015            2020          2025
<S>                               <C>             <C>             <C>             <C>             <C>              <C>        
ASSETS

Investment securities, at value
  (identified cost of
  $234,953,553, $380,831,587,
  $163,868,666, $103,796,839,
  $408,803,791 and $181,475,172,
  respectively) (Note 3) .......  $ 240,373,763   $ 407,069,198   $ 182,575,705   $ 144,933,175   $ 557,859,896    $205,665,25

Cash ...........................         12,720       1,172,801       1,524,994         409,739         585,438      1,012,847

Other receivable ...............           --              --              --              --            15,135           --
                                  -------------   -------------   -------------   -------------   -------------  -------------
                                    240,386,483     408,241,999     184,100,699     145,342,914     558,460,469    206,678,101
                                  -------------   -------------   -------------   -------------   -------------  -------------
LIABILITIES

Disbursements in excess
  of demand deposit cash .......        224,710         295,691         256,679          43,001         514,685        240,321

Payable for capital shares
  redeemed .....................        131,451       1,353,147         132,216          99,918         738,311        801,163

Accrued management
  fee (Note 2) .................        120,182         202,392          90,356          72,362         281,863        103,922

Payable for trustees'
  fees and expenses ............            758             935             695             655           1,096            720
                                  -------------   -------------   -------------   -------------   -------------  -------------
                                        477,101       1,852,165         479,946         215,936       1,535,955      1,146,126
                                  -------------   -------------   -------------   -------------   -------------  -------------
Net Assets .....................  $ 239,909,382   $ 406,389,834   $ 183,620,753   $ 145,126,978   $ 556,924,514    $205,531,97
                                  =============   =============   =============   =============   =============  =============
CAPITAL SHARES

Outstanding (Unlimited
  number of shares
  authorized) ..................      2,694,025       5,930,051       3,433,442       3,369,568      17,781,654      7,922,723
                                  =============   =============   =============   =============   =============  =============
Net Asset Value Per Share ......  $       89.05   $       68.53   $       53.48   $       43.07   $       31.32  $       25.94
                                  =============   =============   =============   =============   =============  =============
NET ASSETS CONSIST OF:

Capital paid in ................  $ 231,079,950   $ 375,139,588   $ 162,613,311   $ 102,313,656   $ 387,434,248    $179,008,72

Undistributed net
  investment income ............      3,450,030       5,091,331       2,401,190       1,880,513       6,966,926      2,699,246

Accumulated undistributed
  net realized gain (loss)
  on investment transactions ...        (40,808)        (78,696)       (100,787)       (203,527)     13,467,235       (366,082)

Net unrealized appreciation on
  investments (Note 3) .........      5,420,210      26,237,611      18,707,039      41,136,336     149,056,105     24,190,082
                                  -------------   -------------   -------------   -------------   -------------  -------------
                                  $ 239,909,382   $ 406,389,834   $ 183,620,753   $ 145,126,978   $ 556,924,514  $ 205,531,975
                                  =============   =============   =============   =============   =============  =============
</TABLE>
See Notes to Financial Statements


SEMIANNUAL REPORT              STATEMENTS OF ASSETS AND LIABILITIES       29


<TABLE>
<CAPTION>
                           STATEMENTS OF OPERATIONS

FOR THE SIX MONTHS ENDED
MARCH 31, 1998 (UNAUDITED)              2000           2005            2010            2015            2020           2025

INVESTMENT INCOME

Income:

<S>                              <C>             <C>            <C>             <C>             <C>            <C>         
Interest .....................   $  7,885,705    $ 10,348,378   $  4,866,675    $  3,839,580    $ 16,244,930   $  4,850,340

Income from securities 
lending ......................            --              --             --              --           105,086         32,906
                                 ------------    ------------   ------------    ------------    ------------   ------------
                                    7,885,705      10,348,378      4,866,675       3,839,580      16,350,016      4,883,246
                                 ------------    ------------   ------------    ------------    ------------   ------------
Expenses (Note 2):

Management fees ..............        720,818         971,465        466,312         398,512       1,721,154        502,049

Trustees' fees and expenses ..          5,515           6,177          4,637           4,410           9,123          4,920
                                 ------------    ------------   ------------    ------------    ------------   ------------
                                      726,333         977,642        470,949         402,922       1,730,277        506,969
                                 ------------    ------------   ------------    ------------    ------------   ------------
Net investment income ........      7,159,372       9,370,736      4,395,726       3,436,658      14,619,739      4,376,277
                                 ------------    ------------   ------------    ------------    ------------   ------------
REALIZED AND UNREALIZED
GAIN (LOSS)
ON INVESTMENTS (NOTE 3)

Net realized gain (loss)
  on investments .............      3,361,323         238,868        (15,540)       (100,044)     16,529,698        138,234

Change in net unrealized
  appreciation on 
  investments ................     (2,124,152)      7,472,926      7,391,483      10,878,643      49,616,228     15,040,285
                                 ------------    ------------   ------------    ------------    ------------   ------------

Net realized and
  unrealized gain
  on investments .............      1,237,171       7,711,794      7,375,943      10,778,599      66,145,926     15,178,519
                                 ------------    ------------   ------------    ------------    ------------   ------------
Net Increase in Net Assets

Resulting from Operations ....   $  8,396,543    $ 17,082,530   $ 11,771,669    $ 14,215,257    $ 80,765,665   $ 19,554,796
                                 ============    ============   ============    ============    ============   ============
</TABLE>

See Notes to Financial Statements


30      STATEMENTS OF OPERATIONS               AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                      STATEMENTS OF CHANGES IN NET ASSETS


SIX MONTHS ENDED MARCH 31, 1998
(UNAUDITED) AND YEAR ENDED
SEPTEMBER 30, 1997                                2000                             2005                             2010

Increase (Decrease) in Net Assets         1998            1997              1998             1997            1998            1997

OPERATIONS

<S>                               <C>              <C>              <C>              <C>              <C>              <C>          
Net investment income .........   $   7,159,372    $  16,169,545    $   9,370,736    $  15,451,023    $   4,395,726    $   6,845,706

Net realized gain (loss)
  on investments ..............       3,361,323        1,190,560          238,868        1,348,958          (15,540)       1,066,854

Change in net unrealized
  appreciation (depreciation)
on investments ................      (2,124,152)       2,108,565        7,472,926       11,653,361        7,391,483        9,112,041
                                  -------------    -------------    -------------    -------------    -------------    -------------
Net increase in net assets
  resulting from operations ...       8,396,543       19,468,670       17,082,530       28,453,342       11,771,669       17,024,601
                                  -------------    -------------    -------------    -------------    -------------    -------------
DISTRIBUTIONS TO
SHAREHOLDERS

From net investment income ....    (15,765,056)     (17,081,069)     (15,987,498)     (14,549,884)      (7,094,254)      (6,941,406)

From net realized gains on
  investment transactions .....            --               --        (1,217,264)      (1,764,760)        (849,134)      (2,886,953)
                                  -------------    -------------    -------------    -------------    -------------    -------------
Decrease in net assets from
  distributions to 
  shareholders ................    (15,765,056)     (17,081,069)     (17,204,762)     (16,314,644)      (7,943,388)      (9,828,359)
                                  -------------    -------------    -------------    -------------    -------------    -------------
CAPITAL SHARE TRANSACTIONS

Proceeds from shares sold .....      31,197,059       68,953,917      167,807,747      121,523,893       79,977,881       63,762,772

Proceeds from reinvestment
  of distributions ............      15,630,391       16,712,103       17,061,205       15,992,574        7,879,476        9,617,856

Payments for shares redeemed ..    (47,926,689)    (107,433,075)     (60,034,027)    (106,841,952)     (32,876,714)     (66,882,232)
                                  -------------    -------------    -------------    -------------    -------------    -------------
Net increase (decrease)
  in net assets from capital
  share transactions ..........      (1,099,239)     (21,767,055)     124,834,925       30,674,515       54,980,643        6,498,396
                                  -------------    -------------    -------------    -------------    -------------    -------------
Net increase (decrease)
  in net assets ...............      (8,467,752)     (19,379,454)     124,712,693       42,813,213       58,808,924       13,694,638

NET ASSETS

Beginning of period ...........     248,377,134      267,756,588      281,677,141      238,863,928      124,811,829      111,117,191
                                  -------------    -------------    -------------    -------------    -------------    -------------
End of period .................   $ 239,909,382    $ 248,377,134    $ 406,389,834    $ 281,677,141    $ 183,620,753      $124,811,82
                                  =============    =============    =============    =============    =============    =============
Undistributed net
  investment income ...........   $   3,450,030    $  12,055,714    $   5,091,331    $  11,708,093    $   2,401,190    $   5,099,718
                                  =============    =============    =============    =============    =============    =============
TRANSACTIONS IN
SHARES OF THE FUNDS

Sold ..........................         353,356          833,120        2,455,653        1,988,109        1,519,604        1,383,983

Issued in reinvestment
  of distributions ............         191,104          217,238          270,807          282,750          159,950          233,038

Redeemed ......................       (544,056)      (1,291,432)        (887,881)      (1,748,806)        (624,118)      (1,456,337)

Reverse share split ...........       (192,640)        (221,717)        (272,951)        (288,036)        (161,116)        (237,690)
                                  -------------    -------------    -------------    -------------    -------------    -------------
Net increase (decrease) .......        (192,236)        (462,791)       1,565,628          234,017          894,320         (77,006)
                                  =============    =============    =============    =============    =============    =============
</TABLE>

See Notes to Financial Statements


SEMIANNUAL REPORT               STATEMENTS OF CHANGES IN NET ASSETS       31


<TABLE>
<CAPTION>
                      STATEMENTS OF CHANGES IN NET ASSETS

SIX MONTHS ENDED MARCH 31, 1998
(UNAUDITED) AND YEAR ENDED
SEPTEMBER 30, 1997                               2000                             2005                             2010

Increase (Decrease) in Net Assets        1998            1997              1998             1997            1998           1997

OPERATIONS

<S>                            <C>              <C>              <C>              <C>              <C>              <C>            
Net investment income ........ $     3,436,658  $     6,594,789  $    14,619,739  $    51,768,641  $     4,376,277  $     3,478,019

Net realized gain (loss)
  on investments .............        (100,044)       4,715,347       16,529,698       45,078,260          138,234          302,702

Change in net unrealized
  appreciation (depreciation)
  on investments .............      10,878,643       10,243,018       49,616,228       85,510,156       15,040,285        9,831,539
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
Net increase in net assets
  resulting from operations ..      14,215,257       21,553,154       80,765,665      182,357,057       19,554,796       13,612,260
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
DISTRIBUTIONS TO
SHAREHOLDERS

From net investment income ...      (6,501,208)      (6,897,189)     (44,888,306)     (54,220,221)      (4,549,154)      (1,603,280)

From net realized gains on
  investment transactions ....      (4,326,523)      (1,134,946)     (41,866,720)            (831)        (305,669)            --
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
Decrease in net assets from
  distributions to shareholders    (10,827,731)      (8,032,135)     (86,755,026)     (54,221,052)      (4,854,823)      (1,603,280)
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
CAPITAL SHARE TRANSACTIONS

Proceeds from shares sold ....      54,491,617       62,777,456      229,709,543      528,512,319      286,488,492      147,285,096

Proceeds from reinvestment
  of distributions ...........      10,744,494        7,799,177       85,814,004       51,887,629        4,802,866        1,500,130

Payments for shares redeemed..     (38,396,228)     (84,851,908)    (306,160,699)  (1,081,304,136)    (174,280,671)    (122,633,493)
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
Net increase (decrease)
  in net assets from capital
  share transactions .........      26,839,883      (14,275,275)       9,362,848     (500,904,188)     117,010,687       26,151,733
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
Net increase (decrease)
  in net assets ..............      30,227,409         (754,256)       3,373,487     (372,768,183)     131,710,660       38,160,713

NET ASSETS

Beginning of period ..........     114,899,569      115,653,825      553,551,027      926,319,210       73,821,315       35,660,602
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
End of period ................ $   145,126,978  $   114,899,569  $   556,924,514  $   553,551,027  $   205,531,975  $    73,821,315
                               ===============  ===============  ===============  ===============  ===============  ===============
Undistributed net
  investment income .......... $     1,880,513  $     4,945,063  $     6,966,926  $    37,235,493  $     2,699,246  $     2,872,123
                               ===============  ===============  ===============  ===============  ===============  ===============
TRANSACTIONS IN
SHARES OF THE FUNDS

Sold .........................       1,285,998        1,812,323        7,622,420       21,885,096       11,496,672        7,508,353

Issued in reinvestment
  of distributions ...........         281,652          241,373        3,356,693        2,286,212          199,764           79,036

Redeemed .....................        (911,156)      (2,427,375)     (10,186,143)     (43,514,345)      (6,886,063)      (6,180,587)

Reverse share split ..........        (283,585)        (248,086)      (3,387,874)      (2,383,074)        (201,848)         (84,260)
                               ---------------  ---------------  ---------------  ---------------  ---------------  ---------------
Net increase (decrease) ......         372,909         (621,765)      (2,594,904)     (21,726,111)       4,608,525        1,322,542
                               ===============  ===============  ===============  ===============  ===============  ===============
</TABLE>

See Notes to Financial Statements


32      STATEMENTS OF CHANGES IN NET ASSETS    AMERICAN CENTURY INVESTMENTS


                         NOTES TO FINANCIAL STATEMENTS

MARCH 31, 1998 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION  -- American  Century  Target  Maturities  Trust (the Trust) is
registered under the Investment  Company Act of 1940 as an open-end  diversified
management  investment  company.  The Trust is composed of the following series:
American Century - Benham Target Maturities Trust: 2000 (2000), American Century
- - Benham Target Maturities Trust: 2005 (2005),  American Century - Benham Target
Maturities  Trust:  2010 (2010),  American  Century - Benham  Target  Maturities
Trust:  2015 (2015),  American Century - Benham Target  Maturities  Trust:  2020
(2020),  and American Century - Benham Target  Maturities Trust: 2025 (2025)(the
Funds).  Each Fund seeks to provide the  highest  attainable  investment  return
consistent  with  the  creditworthiness  of  U.S.  Treasury  securities  and the
professional  management of  reinvestment  and market  risks.  Each Fund invests
primarily in zero-coupon U.S. Treasury securities and will be liquidated shortly
after the  conclusion of its target  maturity  year. The Funds are authorized to
issue two classes of shares:  the Investor Class and the Advisor Class.  The two
classes of shares differ principally in their respective  shareholder  servicing
and distribution expenses and arrangements. All shares of the Funds represent an
equal pro rata interest in the assets of the class to which such shares  belong,
and have identical voting,  dividend,  liquidation and other rights and the same
terms and conditions, except for class specific expenses and exclusive rights to
vote on matters affecting only individual classes. Sale of the Advisor Class had
not  commenced  as of the report  date.  The  following  significant  accounting
policies,  related  to  both  classes  of  the  Funds,  are in  accordance  with
accounting policies generally accepted in the investment company industry.

    SECURITY  VALUATIONS -- Securities are valued  through a commercial  pricing
service or at the mean of the most recent bid and asked prices.  When valuations
are not readily available,  securities are valued at fair value as determined in
accordance with procedures adopted by the Board of Trustees.

    SECURITY TRANSACTIONS -- Security transactions are accounted for on the date
purchased  or  sold.  Net  realized  gains  and  losses  are  determined  on the
identified cost basis, which is also used for federal income tax purposes.

    INVESTMENT  INCOME -- Interest  income is recorded on the accrual  basis and
includes accretion of discounts and amortization of premiums.

    INCOME  TAX  STATUS  -- It is  the  Funds'  policy  to  distribute  all  net
investment  income  and  net  realized  capital  gains  to  shareholders  and to
otherwise qualify as a regulated  investment company under the provisions of the
Internal  Revenue Code.  Accordingly,  no provision has been made for federal or
state income taxes.

    DISTRIBUTIONS  TO SHAREHOLDERS -- Distributions  from net investment  income
and net realized gains are declared and paid annually in December.  At September
30, 1997  accumulated  capital loss  carryovers of $3,399,216 for 2000 (expiring
2003) may be used to offset future taxable gains.

    The  character  of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net capital gains and losses for financial statement
and tax  purposes  and may  result in  reclassification  among  certain  capital
accounts.

    REVERSE  SHARE  SPLITS -- The trustees may  authorize  reverse  share splits
immediately after and of a size that exactly offsets the per share amount of the
annual  dividend  and capital  gain  distribution  (if any).  After  taking into
account the reverse share split, a shareholder reinvesting dividends and capital
gain  distributions  will hold  exactly the same number of shares owned prior to
the  distributions  and reverse share split.  A shareholder  electing to receive
dividends in cash will own fewer shares.

    USE OF 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 increases and decreases in
net assets from operations  during the period.  Actual results could differ from
these estimates.

    ADDITIONAL  INFORMATION -- Effective  January 15, 1998,  Funds  Distributor,
Inc.  (FDI)  became the Trust's  distributor.  Certain  officers of FDI are also
officers of the Trust.


SEMIANNUAL REPORT                     NOTES TO FINANCIAL STATEMENTS       33


                         NOTES TO FINANCIAL STATEMENTS

MARCH 31, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The Trust has entered  into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (ACIM) that  provides  each Fund with  investment
advisory and management  services in exchange for a single,  unified  management
fee per class.  Expenses  excluded  from this  agreement are  brokerage,  taxes,
portfolio  insurance,  interest,  fees and  expenses of the Trustees who are not
considered "interested persons" as defined in the Investment Company Act of 1940
(including  counsel fees) and extraordinary  expenses.  The annual rate at which
this fee is assessed is determined  monthly in a two-step process:  First, a fee
rate  schedule  is  applied  to the net assets of all of the funds in the Fund's
investment  category which are managed by ACIM (the "Investment  Category Fee").
The  overall  investment  objective  of  each  Fund  determines  its  Investment
Category.  The three investment  categories are: the Money Market Fund Category,
the Bond Fund Category and the Equity Fund  Category.  The Funds are included in
the Bond Fund Category.  Second,  a separate fee rate schedule is applied to the
net  assets  of all of the  funds  managed  by ACIM  (the  "Complex  Fee").  The
Investment  Category  Fee and the  Complex Fee are then added to  determine  the
unified  management  fee rate.  The  management fee is paid monthly by each Fund
based on each Fund's  aggregate  average  daily net assets  during the  previous
month multiplied by the monthly  management fee rate. The annualized  Investment
Category Fee schedule for each Fund is as follows:

     0.3600% of the first $1 billion 
     0.3080% of the next $1 billion 
     0.2780% of the next $3 billion 
     0.2580% of the next $5 billion 
     0.2450% of the next $15 billion 
     0.2430% of the next $25 billion
     0.2425% of the average daily net assets over $50 billion


    The annualized Complex Fee schedule (Investor Class) is as follows:

     0.3100% of the first $2.5 billion 
     0.3000% of the next $7.5 billion 
     0.2985% of the next $15 billion 
     0.2970% of the next $25 billion 
     0.2960% of the next $50 billion 
     0.2950% of the next $100 billion 
     0.2940% of the next $100 billion 
     0.2930% of the next $200 billion 
     0.2920% of the next $250 billion
     0.2910% of the next $500 billion
     0.2900% of the average daily net assets over $1,250 billion

    The Complex Fee schedule  for the Advisor  Class is lower by 0.2500% at each
graduated  step.  For example,  if the Investor Class Complex Fee is 0.3100% for
the first $2.5 billion,  the Advisor Class Complex Fee is 0.0600% (0.3100% minus
0.2500%) for the first $2.5 billion.

    The Board of Trustees has adopted the Advisor Class Master  Distribution and
Shareholder  Services Plan (the Plan),  pursuant to Rule 12b-1 of the Investment
Company Act of 1940.  The Plan  provides  that the Funds will pay ACIM an annual
distribution  fee equal to 0.25% and  service  fee equal to 0.25%.  The fees are
computed  daily and paid  monthly  based on the Advisor  Class's  average  daily
closing net assets  during the previous  month.  The  distribution  fee provides
compensation for distribution  expenses incurred by financial  intermediaries in
connection  with  distributing  shares of the Advisor Class  including,  but not
limited to, payments to brokers,  dealers, and financial  institutions that have
entered into sales  agreements with respect to shares of the Funds.  The service
fee provides  compensation for shareholder and administrative  services rendered
by ACIM, its affiliates or independent third party providers.

    Certain  officers  and  trustees  of the  Trust  are  also  officers  and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies, Inc., the parent of the Trust's investment manager, ACIM, the Trust's
transfer  agent,  American  Century  Services  Corporation,  and the  registered
broker-dealer, American Century Investment Services, Inc.


34      NOTES TO FINANCIAL STATEMENTS          AMERICAN CENTURY INVESTMENTS


                         NOTES TO FINANCIAL STATEMENTS

MARCH 31, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

  Investment  transactions in U.S.  Treasury  securities,  excluding  short-term
investments were as follows:


<TABLE>
                                 2000           2005             2010            2015           2020             2025

<S>                           <C>           <C>              <C>             <C>             <C>             <C>         
Purchases ..................  $75,219,477   $129,551,823     $51,905,205     $27,933,010     $56,869,480     $156,668,890

Proceeds From Sales ........  $92,752,230    $17,269,825      $5,337,310     $12,284,160    $137,297,920      $44,666,880

On March 31, 1998, the composition of unrealized  appreciation  and depreciation
of investment  securities based on the aggregate cost of investments for federal
income tax purposes was as follows:

                                 2000           2005             2010            2015           2020             2025

Appreciation ...............  $5,704,825     $26,057,936     $18,622,752      $41,263,112    $148,465,484     $24,395,570

Depreciation ...............   (284,615)     (136,933)           --           (126,776)         --             (595,655)
                            -------------   -------------   -------------   -------------   -------------   -------------
Net ........................  $5,420,210     $25,921,003     $18,622,752      $41,136,336    $148,465,484    $23,799,915
                            -------------   -------------   -------------   -------------   -------------   -------------
Federal Tax Cost ........... $234,953,553   $381,148,195    $163,952,953     $103,796,839    $409,394,412    $181,865,339
                            =============   =============   =============   =============   =============   =============
</TABLE>


SEMIANNUAL REPORT                     NOTES TO FINANCIAL STATEMENTS          35


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS
                         TARGET MATURITIES TRUST: 2000

For a Share  Outstanding  Throughout  the Years  Ended  September  30 (except as
noted)

                                         1998(1)              1997           1996             1995            1994           1993
PER-SHARE DATA

Net Asset Value,
<S>                                 <C>                <C>             <C>             <C>             <C>             <C>        
Beginning of Period .............   $     86.05        $     79.95     $     76.86     $     66.93     $     72.40     $     62.16
                                    -----------        -----------     -----------     -----------     -----------     -----------
Income From Investment
  Operations

  Net Investment Income(2) ......          2.57               5.10            4.75            4.37            3.99            3.94

  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ..................          0.43               1.00           (1.66)           5.56           (9.46)           6.30
                                    -----------        -----------     -----------     -----------     -----------     -----------
  Total From Investment
  Operations ....................          3.00               6.10            3.09            9.93           (5.47)          10.24
                                    -----------        -----------     -----------     -----------     -----------     -----------
Distributions(3)

  From Net Investment
  Income ........................         (5.64)             (5.20)          (3.94)          (3.42)          (3.25)          (2.34)

  From Net Realized
  Capital Gains .................          --                 --              --              --             (2.95)          (1.83)

  In Excess of Net
  Realized Gains ................          --                 --              --              --             (1.20)           --
                                    -----------        -----------     -----------     -----------     -----------     -----------
  Total Distributions ...........         (5.64)             (5.20)          (3.94)          (3.42)          (7.40)          (4.17)
                                    -----------        -----------     -----------     -----------     -----------     -----------
Reverse Share Split .............          5.64               5.20            3.94            3.42            7.40            4.17
                                    -----------        -----------     -----------     -----------     -----------     -----------
Net Asset Value,
End of Period ...................   $     89.05        $     86.05     $     79.95     $     76.86     $     66.93     $     72.40
                                    ===========        ===========     ===========     ===========     ===========     ===========
  Total Return(4) ...............          3.47%              7.64%           4.01%          14.84%          (7.54)%         16.46%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets ...........          0.60%(5)           0.56%           0.53%           0.63%           0.59%           0.60%

Ratio of Net Investment
  Income to Average
  Net Assets ....................          5.87%(5)           6.14%           5.99%           6.13%           5.74%           5.94%

Portfolio Turnover Rate .........            31%                10%             29%             53%             89%             77%

Net Assets, End
of Period (in thousands) ........   $   239,909        $   248,377     $   267,757     $   294,736     $   243,895     $   291,418
</TABLE>

(1) Six months ended March 31, 1998 (unaudited).

(2) Computed using average shares outstanding throughout the period.

(3) For years ended prior to September 30, 1997,  distributions  were calculated
    using average shares  outstanding during the year.  Distributions  indicated
    for those years will be different than the actual per-share distributions to
    shareholders.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any.  Total  returns  for  less  than  one  year  are not
    annualized.

(5) Annualized.

See Notes to Financial Statements


36      FINANCIAL HIGHLIGHTS                   AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS
                         TARGET MATURITIES TRUST: 2005

For a Share Outstanding Throughout the Years Ended September 30
(except as noted)

                                         1998(1)              1997            1996            1995            1994            1993
PER-SHARE DATA

Net Asset Value,
<S>                                  <C>                <C>             <C>             <C>             <C>            <C>        
Beginning of Period ..............   $     64.54        $     57.83     $     56.61     $     45.22     $     51.84    $     41.18
                                     -----------        -----------     -----------     -----------     -----------    -----------
Income From Investment
  Operations

  Net Investment Income(2) .......          1.90               3.74            3.50            3.33            3.11           2.90

  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ...................          2.09               2.97           (2.28)           8.06           (9.73)          7.76
                                     -----------        -----------     -----------     -----------     -----------    -----------
  Total From Investment
  Operations .....................          3.99               6.71            1.22           11.39           (6.62)         10.66
                                     -----------        -----------     -----------     -----------     -----------    -----------
Distributions(3)

  From Net Investment
  Income .........................         (3.61)             (3.61)          (2.06)          (2.41)          (2.70)         (2.51)

  From Net Realized
  Capital Gains ..................         (0.27)             (0.44)          (0.58)          (0.67)          (8.47)         (1.01)
                                     -----------        -----------     -----------     -----------     -----------    -----------
  Total Distributions ............         (3.88)             (4.05)          (2.64)          (3.08)         (11.17)         (3.52)
                                     -----------        -----------     -----------     -----------     -----------    -----------
Reverse Share Split ..............          3.88               4.05            2.64            3.08           11.17           3.52
                                     -----------        -----------     -----------     -----------     -----------    -----------
Net Asset Value,
End of Period ....................   $     68.53        $     64.54     $     57.83     $     56.61     $     45.22    $     51.84
                                     ===========        ===========     ===========     ===========     ===========    ===========
  Total Return(4) ................          6.18%             11.60%           2.15%          25.16%         (12.75)%        25.89%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets ............          0.60%(5)           0.57%           0.58%           0.71%           0.64%          0.62%

Ratio of Net Investment
  Income to Average
  Net Assets .....................          5.71%(5)           6.15%           6.05%           6.58%           6.37%          6.44%

Portfolio Turnover Rate ..........             5%                15%             31%             34%             68%            50%

Net Assets, End
of Period (in thousands) .........   $   406,390        $   281,677     $   238,864     $   183,452     $    96,207    $   149,890
</TABLE>

(1) Six months ended March 31, 1998 (unaudited).

(2) Computed using average shares outstanding throughout the period.

(3) For years ended prior to September 30, 1997,  distributions  were calculated
    using average shares  outstanding during the year.  Distributions  indicated
    for those years will be different than the actual per-share distributions to
    shareholders.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any.  Total  returns  for  less  than  one  year  are not
    annualized.

(5) Annualized.

See Notes to Financial Statements


SEMIANNUAL REPORT                              FINANCIAL HIGHLIGHTS       37


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS
                         TARGET MATURITIES TRUST: 2010

For a Share Outstanding Throughout the Years Ended September 30
(except as noted)

                                           1998(1)              1997            1996            1995           1994           1993
PER-SHARE DATA

Net Asset Value,
<S>                                    <C>                <C>             <C>             <C>            <C>            <C>        
Beginning of Period ................   $     49.16        $     42.47     $     42.14     $     31.67    $     38.13    $     28.53
                                       -----------        -----------     -----------     -----------    -----------    -----------
Income From Investment
  Operations

  Net Investment Income(2) .........          1.46               2.79            2.58            2.41           2.24           2.05

  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions .....................          2.86               3.90           (2.25)           8.06          (8.70)          7.55
                                       -----------        -----------     -----------     -----------    -----------    -----------
  Total From Investment
  Operations .......................          4.32               6.69            0.33           10.47          (6.46)          9.60
                                       -----------        -----------     -----------     -----------    -----------    -----------
Distributions(3)

  From Net Investment
  Income ...........................         (2.46)             (2.82)          (1.57)          (1.48)         (1.46)         (1.58)

  From Net Realized
  Capital Gains ....................         (0.29)             (1.17)           --             (0.48)         (4.31)         (1.14)
                                       -----------        -----------     -----------     -----------    -----------    -----------
  Total Distributions ..............         (2.75)             (3.99)          (1.57)          (1.96)         (5.77)         (2.72)
                                       -----------        -----------     -----------     -----------    -----------    -----------
Reverse Share Split ................          2.75               3.99            1.57            1.96           5.77           2.72
                                       -----------        -----------     -----------     -----------    -----------    -----------
Net Asset Value,
End of Period ......................   $     53.48        $     49.16     $     42.47     $     42.14    $     31.67    $     38.13
                                       ===========        ===========     ===========     ===========    ===========    ===========
  Total Return(4) ..................          8.79%             15.75%           0.78%          33.06%        (16.92)%        33.61%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets ..............          0.60%(5)           0.62%           0.67%           0.71%          0.68%          0.66%

Ratio of Net Investment
  Income to Average
  Net Assets .......................          5.56%(5)           6.15%           5.98%           6.56%          6.35%          6.32%

Portfolio Turnover Rate ............             3%                26%             24%             26%            35%           132%

Net Assets, End
of Period (in thousands) ...........   $   183,621        $   124,812     $   111,117     $    95,057    $    46,312    $    70,551
</TABLE>

(1) Six months ended March 31, 1998 (unaudited).

(2) Computed using average shares outstanding throughout the period.

(3) For years ended prior to September 30, 1997,  distributions  were calculated
    using average shares  outstanding during the year.  Distributions  indicated
    for those years will be different than the actual per-share distributions to
    shareholders.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any.  Total  returns  for  less  than  one  year  are not
    annualized.

(5) Annualized.

See Notes to Financial Statements


38      FINANCIAL HIGHLIGHTS                   AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS
                         TARGET MATURITIES TRUST: 2015

For a Share Outstanding Throughout the Years Ended September 30
(except as  noted)

                                          1998(1)              1997            1996            1995           1994             1993
PER-SHARE DATA

Net Asset Value,
<S>                                   <C>                <C>             <C>             <C>             <C>            <C>        
Beginning of Period ...............   $     38.34        $     31.96     $     32.20     $     22.79     $     29.04    $     20.39
                                      -----------        -----------     -----------     -----------     -----------    -----------
Income From Investment
  Operations

  Net Investment Income(2) ........          1.06               2.00            1.85            1.71            1.57           1.46

  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ....................          3.67               4.38           (2.09)           7.70           (7.82)          7.19
                                      -----------        -----------     -----------     -----------     -----------    -----------
  Total From Investment
  Operations ......................          4.73               6.38           (0.24)           9.41           (6.25)          8.65
                                      -----------        -----------     -----------     -----------     -----------    -----------
Distributions(3)

  From Net Investment
  Income ..........................         (2.11)             (2.05)          (1.28)          (0.87)          (1.19)         (1.45)

  From Net Realized
  Capital Gains ...................         (1.40)             (0.34)          (1.61)           --             (7.08)         (0.34)

  In Excess of Net
  Realized Gains ..................          --                 --              --              --             (0.37)          --
                                      -----------        -----------     -----------     -----------     -----------    -----------
  Total Distributions .............         (3.51)             (2.39)          (2.89)          (0.87)          (8.64)         (1.79)
                                      -----------        -----------     -----------     -----------     -----------    -----------
Reverse Share Split ...............          3.51               2.39            2.89            0.87            8.64           1.79
                                      -----------        -----------     -----------     -----------     -----------    -----------
Net Asset Value,
End of Period .....................   $     43.07        $     38.34     $     31.96     $     32.20     $     22.79    $     29.04

  Total Return(4) .................         12.34%             19.96%          (0.74)%         41.29%         (21.52)%        42.42%
                                      ===========        ===========     ===========     ===========     ===========    ===========

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets .............          0.60%(5)           0.61%           0.65%           0.71%           0.68%          0.63%

Ratio of Net Investment
  Income to Average
  Net Assets ......................          5.09%(5)           5.79%           5.63%           6.40%           5.97%          6.28%

Portfolio Turnover Rate ...........             9%                21%             17%             70%             65%           138%

Net Assets, End
of Period (in thousands) ..........   $   145,127        $   114,900     $   115,654     $   114,647     $    66,073    $    89,023
</TABLE>

(1) Six months ended March 31, 1998 (unaudited).

(2) Computed using average shares outstanding throughout the period.

(3) For years ended prior to September 30, 1997,  distributions  were calculated
    using average shares  outstanding during the year.  Distributions  indicated
    for those years will be different than the actual per-share distributions to
    shareholders.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any.  Total  returns  for  less  than  one  year  are not
    annualized.

(5) Annualized.

See Notes to Financial Statements


SEMIANNUAL REPORT                              FINANCIAL HIGHLIGHTS       39


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS
                         TARGET MATURITIES TRUST: 2020

For a Share Outstanding Throughout the Years Ended September 30
(except as noted)

                                          1998(1)              1997            1996            1995            1994            1993
PER-SHARE DATA

Net Asset Value,
<S>                                   <C>                <C>             <C>             <C>             <C>            <C>        
Beginning of Period ...............   $     27.17        $     22.00     $     22.47     $     15.28     $     20.72    $     13.63
                                      -----------        -----------     -----------     -----------     -----------    -----------
Income From Investment
  Operations

  Net Investment Income(2) ........          0.76               1.51            1.41            1.19            1.13           1.00

  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ....................          3.39               3.66           (1.88)           6.00           (6.57)          6.09
                                      -----------        -----------     -----------     -----------     -----------    -----------
  Total From Investment
  Operations ......................          4.15               5.17           (0.47)           7.19           (5.44)          7.09
                                      -----------        -----------     -----------     -----------     -----------    -----------
Distributions(3)

  From Net Investment
  Income ..........................         (2.35)             (1.45)          (0.40)          (0.21)          (0.28)         (0.53)

  From Net Realized
  Capital Gains ...................         (2.19)              --             (0.04)           --             (1.31)         (0.72)

  In Excess of Net
  Realized Gains ..................          --                 --              --              --             (1.18)          --
                                      -----------        -----------     -----------     -----------     -----------    -----------
  Total Distributions .............         (4.54)             (1.45)          (0.44)          (0.21)          (2.77)         (1.25)
                                      -----------        -----------     -----------     -----------     -----------    -----------
Reverse Share Split ...............          4.54               1.45            0.44            0.21            2.77           1.25
                                      -----------        -----------     -----------     -----------     -----------    -----------
Net Asset Value,
End of Period .....................   $     31.32        $     27.17     $     22.00     $     22.47     $     15.28    $     20.72
                                      ===========        ===========     ===========     ===========     ===========    ===========
  Total Return(4) .................         15.27%             23.50%          (2.09)%         47.05%         (26.25)%        52.02%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets .............          0.60%(5)           0.53%           0.61%           0.72%           0.70%          0.70%

Ratio of Net Investment
  Income to Average
  Net Assets ......................          5.03%(5)           6.29%           6.25%           6.24%           6.28%          6.10%

Portfolio Turnover Rate ...........            10%                14%             47%             78%            116%           179%

Net Assets, End
of Period (in thousands) ..........   $   556,925        $   553,551     $   926,319     $   574,702     $    58,535    $    56,125
</TABLE>

(1) Six months ended March 31, 1998 (unaudited).

(2) Computed using average shares outstanding throughout the period.

(3) For years ended prior to September 30, 1997,  distributions  were calculated
    using average shares  outstanding during the year.  Distributions  indicated
    for those years will be different than the actual per-share distributions to
    shareholders.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any.  Total  returns  for  less  than  one  year  are not
    annualized.

(5) Annualized.

See Notes to Financial Statements


40      FINANCIAL HIGHLIGHTS                   AMERICAN CENTURY INVESTMENTS


                             FINANCIAL HIGHLIGHTS
                         TARGET MATURITIES TRUST: 2025

For a Share Outstanding Throughout the Years Ended September 30
(except as noted)

                                       1998(1)         1997          1996(2)
PER-SHARE DATA

Net Asset Value,
Beginning of Period .........   $     22.27        $     17.91    $     19.85
                                -----------        -----------    -----------
Income From Investment
  Operations

  Net Investment Income(3) ..          0.66               1.21           0.72

  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ..............          3.01               3.15          (2.66)
                                -----------        -----------    -----------
  Total From Investment
  Operations ................          3.67               4.36          (1.94)
                                -----------        -----------    -----------
Distributions

  From Net Investment
  Income ....................         (0.70)             (0.72)          --

  From Net Realized
  Capital Gains .............         (0.05)              --             --
                                -----------        -----------    -----------
  Total Distributions .......         (0.75)             (0.72)          --
                                -----------        -----------    -----------
Reverse Share Split .........          0.75               0.72           --
                                -----------        -----------    -----------
Net Asset Value,
End of Period ...............   $     25.94        $     22.27    $     17.91
                                ===========        ===========    ===========
  Total Return(4) ...........         16.48%             24.34%         (9.77)%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets .......         0.60%(5)           0.62%          0.67%(5)

Ratio of Net Investment
  Income to Average
  Net Assets ................         5.16%(5)           6.14%          6.57%(5)

Portfolio Turnover Rate .....            27%                58%            61%

Net Assets, End
of Period (in thousands) ....   $   205,532        $    73,821    $    35,661

(1) Six months ended March 31, 1998 (unaudited).

(2) February 15, 1996 (inception) through September 30, 1996.

(3) Computed using average shares outstanding throughout the period.

(4) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(5) Annualized.

See Notes to Financial Statements


SEMIANNUAL REPORT                              FINANCIAL HIGHLIGHTS       41


                        RETIREMENT ACCOUNT INFORMATION

    As required by law,  any  distributions  you receive from an IRA and certain
403(b)  distributions [not eligible for rollover to an IRA or to another 403(b)]
are subject to federal  income tax  withholding  at the rate of 10% of the total
amount withdrawn,  unless you elect not to have withholding  apply. If you don't
want us to withhold on this amount, you may send us a written notice not to have
the federal  income tax  withheld.  Your written  notice is valid for six months
from the date of receipt at American Century.  Even if you plan to roll over the
amount you withdraw to another tax-deferred  account, the withholding rate still
applies to the withdrawn  amount unless we have received a written notice not to
withhold federal income tax within six months prior to the withdrawal.

    When you plan to  withdraw,  you may make your  election by  completing  our
Exchange/  Redemption form or an IRS Form W-4P. Call American Century for either
form.  Your  written  election  is valid  for only six  months  from the date of
receipt at American Century. You may revoke your election at any time by sending
a written notice to us.

    Remember,  even if you elect not to have income tax withheld, you are liable
for paying income tax on the taxable  portion of your  withdrawal.  If you elect
not to have income tax  withheld or you don't have enough  income tax  withheld,
you may be  responsible  for payment of estimated  tax. You may incur  penalties
under the estimated tax rules if your withholding and estimated tax payments are
not sufficient.


42      RETIREMENT ACCOUNT INFORMATION         AMERICAN CENTURY INVESTMENTS


                                     NOTES


SEMIANNUAL REPORT                                             NOTES       43


                            BACKGROUND INFORMATION

INVESTMENT PHILOSOPHY & POLICIES

    The Benham Group  offers 39  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

    In addition to these principles, each fund has its own investment policies:

    The six TARGET MATURITIES TRUST funds, including TARGET: 2000, TARGET: 2005,
TARGET:  2010, TARGET:  2015, TARGET: 2020 and TARGET: 2025, are variable-priced
bond funds that invest  primarily in zero-coupon  U.S.  Treasury  securities and
will be liquidated  shortly after the conclusion of their target  maturity year.
Although these funds offer a relatively  predictable return if held to maturity,
they  may  be  subject  to  dramatic  price  fluctuations  that  can  result  in
significant gains or losses if sold prior to maturity.

COMPARATIVE INDICES

    The following index is used in the report for fund performance  comparisons.
The index is not an investment product available for purchase.

    The MERRILL  LYNCH  LONG-TERM  TREASURY  INDEX is an index of U.S.  Treasury
securities with maturities greater than 10 years.

FUND BENCHMARKS

    The  benchmarks  for the Target  Maturities  Trust  funds are coupon  STRIPS
issues maturing in the target year of each portfolio.

    The  benchmark  for the Target:  2000 fund is the 11/15/00  STRIPS  ISSUE--a
zero-coupon Treasury bond that matures November 15, 2000.

    The  benchmark  for the Target:  2005 fund is the 11/15/05  STRIPS  ISSUE--a
zero-coupon Treasury bond that matures November 15, 2005.

    The  benchmark  for the Target:  2010 fund is the 11/15/10  STRIPS  ISSUE--a
zero-coupon Treasury bond that matures November 15, 2010.

    The  benchmark  for the Target:  2015 fund is the 11/15/15  STRIPS  ISSUE--a
zero-coupon Treasury bond that matures November 15, 2015.

    The  benchmark  for the Target:  2020 fund is the 11/15/20  STRIPS  ISSUE--a
zero-coupon Treasury bond that matures November 15, 2020.

    The  benchmark  for the Target:  2025 fund is the 11/15/25  STRIPS  ISSUE--a
zero-coupon Treasury bond that matures November 15, 2025.

- --------------------------------------------------------------------------------
INVESTMENT TEAM LEADERS
- --------------------------------------------------------------------------------
  Portfolio Manager                          Dave Schroeder
- --------------------------------------------------------------------------------

44      BACKGROUND INFORMATION                 AMERICAN CENTURY INVESTMENTS


                                   GLOSSARY

INVESTMENT TERMS

* BASIS POINT--one  one-hundredth  of a percentage  point (or 0.01%).  100 basis
points equal one percentage point (or 1%).

* COUPON--the stated interest rate of a security.

* YIELD CURVE--a graphic representation of the relationship between maturity and
yield  for  fixed-income   securities.   Yield  curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on pages 36-41.

STATISTICAL TERMINOLOGY

* NUMBER OF SECURITIES--the  number of different  securities held by a fund on a
given date.

* ANTICIPATED  GROWTH RATE (AGR)--an  approximation  of the  annualized  rate of
return that an  investor  may expect  from his  purchase  date to the fund's WAM
date, assuming all dividends and capital gains distributions are reinvested.  It
assumes  that the  Anticipated  Value at  Maturity  is reached  on the  Weighted
Average Maturity date.

*  WEIGHTED  AVERAGE  MATURITY  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

* WAM DATE (WEIGHTED AVERAGE MATURITY DATE)--an average of the maturity dates of
a portfolio's securities,  weighted by dollar amount. The WAM date is calculated
based on the WAM of the portfolio's investments on a given day.

*  ANTICIPATED  VALUE AT  MATURITY  (AVM)--the  expected  redemption  value of a
portfolio share on the  portfolio's  WAM date.  (Even if fund shares are held to
maturity,  there is no guarantee  that the fund's share price will reach its AVM
or that the AGR will be realized.)

*   EXPENSE RATIO--the operating expenses of the fund, expressed as a percentage
of average net assets. (See Note 2 in the Notes to Financial Statements.)

TYPES OF SECURITIES

* ZERO-COUPON  BONDS  (ZEROS)--bonds  that make no periodic  interest  payments.
Instead,  they are sold at a deep discount and then redeemed for their full face
value at maturity.  When held to maturity, a zero's entire return comes from the
difference between its purchase price and its value at maturity.

TYPES OF ZEROS

* STRIPS (SEPARATE  TRADING OF REGISTERED  INTEREST AND PRINCIPAL OF SECURITIES)
- --the U.S.  Treasury  Department  program that allows  broker-dealers to "strip"
Treasury  securities into their component parts. The securities  created by this
"stripping" activity are also known as STRIPS.  STRIPS are direct obligations of
the U.S.  government  and are the most liquid  (easily bought and sold) Treasury
zeros.

* REFCORPS  (RESOLUTION  FUNDING  CORPORATION  ZEROS)--zeros  created from bonds
issued by the Resolution  Funding  Corporation,  a U.S.  government  agency. The
principal  portions  of these  bonds are  secured  by  Treasury  zeros,  and the
interest  portions  are  guaranteed  by the  U.S.  Treasury.  REFCORPs  are also
relatively liquid.

* RECEIPT  ZEROS--zeros  created and issued by broker-dealers  before the STRIPS
program was  implemented in 1985. The effective  maturities of existing  receipt
zeros  do not  extend  beyond  2009.  Broker-dealers  created  receipt  zeros by
purchasing Treasury bonds, depositing them in a custodian bank, and then selling
receipts representing ownership interest in the coupons or principal portions of
the bonds.  The custodial  accounts that hold the underlying  Treasury bonds are
kept separate from the bank's assets. The types of receipt zeros include:

    CATS  (CERTIFICATES  OF ACCRUAL OF TREASURY  SECURITIES)--issued  by Salomon
    Brothers, Inc.

    TRS (TREASURY RECEIPTS)--general receipt zeros.

    ETRS (EASY-GROWTH TREASURY RECEIPTS)--issued by Dean Witter Reynolds, Inc.


SEMIANNUAL REPORT                                          GLOSSARY       45

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