AMERICAN CENTURY INVESTMENT TRUST
N-30D, 1999-04-30
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[front cover]
                                                              FEBRUARY 28, 1999

ANNUAL REPORT
- -----------------
AMERICAN CENTURY

[graphic of stairs]


PRIME MONEY MARKET

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

[inside front cover]

AMERICAN CENTURY KEEPS WITH TRADITION
- --------------------------------------------------------------------------------

FOLLOWING BENHAM'S FOOTSTEPS

On March 1, we made it easier for you to do business with us. We simplified  our
organizational  structure by  eliminating  the  venerable  Benham and  Twentieth
Century names, and putting all our funds under American Century. The name change
will not affect your funds' investment  management--the proven Benham investment
philosophy, experienced portfolio management teams, and legacy of innovation and
high-quality performance remain.

CONSISTENT,  SOLID  PERFORMANCE--We'll  continue  to  adhere  to the  investment
practices  that have  helped  our  fixed-income  funds  perform so well over the
years. In 1998,  two-thirds of American Century bond funds beat their peer group
average, according to Lipper, Inc.

CONSISTENT  INVESTMENT  PHILOSOPHY--American  Century  fixed-income  funds  will
continue to offer a "pure play" on their sector of the market, as they did under
Benham.

CONTINUITY  OF THE  MANAGEMENT  TEAM--The  investment  process  is not all  that
remains  the same;  we've  retained  our core team of  experienced  fixed-income
portfolio managers.

    *  Experience--The  more than 35 fixed-income  investment  professionals  at
       American  Century have an average of nine years of investment  management
       experience.

    *  Bigger and better--Since  American Century was formed,  we've doubled the
       size  of the  original  Benham  management  team  in our  Mountain  View,
       California office.

TRADITION OF INNOVATION--Like  Benham before it, American Century is a leader in
fixed-income  fund  innovation.  For example,  we introduced a total of four new
fixed-income  funds  in the  last  three  years,  including  the  first  no-load
inflation-adjusted bond fund.

We continue to run our fixed-income operation from our offices in Mountain View,
California, which is also home to our walk-in Investor Center.

We look forward to continuing to meet your fixed-income  investment needs in the
Benham tradition.

WHAT'S NEW . . .

    We now classify our funds in easy-to-remember  categories based on objective
and risk. The four  objective  categories  are:  CAPITAL  PRESERVATION,  INCOME,
GROWTH AND INCOME,  and GROWTH.  The three risk  categories  are:  CONSERVATIVE,
MODERATE,  and AGGRESSIVE.  This new  classification  system makes it easier for
investors to identify which funds are right for them.

    Turn to the  inside  back  cover of this  report  to see a list of the funds
classified by objective and risk. For  definitions of the fund  categories,  see
the Glossary.

Past performance is no guarantee of future results.

[left margin]

PRIME MONEY MARKET
(BPRXX)
- -------------------------------------------------------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     During  the year  ended  February  28,  1999,  the U.S.  financial  markets
experienced a dramatic shift in expectations  that caused inflation  predictions
and interest  rates to seesaw.  When we addressed  you six months ago in Prime's
semiannual  report,  the economic outlook appeared  grim--financial  problems in
Asia,  Russia,  and Latin  America  sent the domestic  stock market  reeling and
pushed  U.S.  bond yields to record  lows.  Volatility  was so rampant  that the
Federal  Reserve (the U.S.  central bank) cut short-term  interest rates for the
first time in three  years to bolster the  economy  and help  stabilize  markets
worldwide.

     Three  interest  rate  cuts by the Fed in six  weeks  appeared  to  bolster
investor  confidence,  which,  in turn,  helped  produce a dramatic stock market
rebound. By February, the most widely followed U.S. stock market indices resumed
hitting new highs after a six-month  hiatus.  The stock market's revival and the
strongest  quarterly  economic  surge in two  years  caused  inflation  fears to
return.  Interest rates rose reflexively,  even though inflation remained at its
lowest level in a dozen years.

     Investors who couldn't  quite stomach the market  upheavals,  or simply had
short-term  financial goals or liquidity needs to meet, found money market funds
such as Prime a relatively  stable  place for their money.  Prime is one of nine
money market funds offered by American Century, which has provided these capital
preservation and portfolio  diversification funds for savers and investors since
1972.  The nine funds range from the top credit quality of Treasury bills to the
higher yields of short-term corporate debt to the tax-exempt income of municipal
securities.

     We've  recently  made some changes in the way we classify our funds that we
hope will make it easier for you to identify and select the money market,  bond,
stock, and other funds that best meet your investment  needs. We reorganized our
entire  family of 71 funds  based on  investment  goals and risk levels (see the
front and back inside covers of this report for more details).

     In addition,  to help you better  understand your fund,  Prime Money Market
shareholders  will receive a new  simplified  prospectus in July.  This document
will  provide  the  fund  information  you  need in  clear  and  straightforward
language, and it includes helpful tips and definitions of investment terms.

     We want your  experience  with  American  Century to be  rewarding,  and we
appreciate your continued confidence in us.

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

[right margin]

          Table of Contents
   Report Highlights ........    2
   Frequently Asked Questions    3
PRIME MONEY MARKET
   Performance Information ..    4
   Portfolio at a Glance ....    4
   Management Q&A ...........    5
   Portfolio Composition
      by Security Type ......    5
   Portfolio Composition
      by Credit Rating ......    6
   Schedule of Investments ..    7
FINANCIAL STATEMENTS
   Statement of Assets and
      Liabilities ...........   11
   Statement of Operations ..   12
   Statements of Changes
      in Net Assets .........   13
   Notes to Financial
      Statements ............   14
   Financial Highlights .....   17
   Report of Independent
      Accountants ...........   19
OTHER INFORMATION
   Share Class and Retirement
      Account Information ...   20
   Background Information
      Investment Philosophy
         and Policies .......   21
      Comparative Indices ...   21
      Lipper Rankings .......   21
      Credit Rating
         Guidelines .........   21
      Investment Team
         Leaders ............   21
   Glossary .................   22


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   Late in 1998, when it appeared that global  economic  turmoil might push the
    U.S. economy toward recession,  the Federal Reserve (the Fed) cut short-term
    interest rates.

*   As a result of the Fed's rate cuts--the first in nearly three  years--yields
    on money market securities headed sharply lower.

*   Although the U.S. economy was bolstered by the Fed's interest rate cuts, it
    remains vulnerable to financial events overseas.

*   In light of somewhat mixed economic signals,  we think that for now, the Fed
    is likely to maintain the same "wait-and-see" approach toward interest rates
    that it's taken so far this year.

MANAGEMENT Q&A

*   Prime  continued to perform well,  finishing among the top 20% of its Lipper
    peers for the year ended February 28, 1999, based on total return.

*   An overall  decline in interest  rates provided the backdrop for the decline
    in the fund's 7-day  current  yield,  which slipped from 5.08% at the end of
    August 1998 to 4.49% by the end of February.

*   We  lengthened  the fund's  weighted  average  maturity a bit,  extending to
    around 70 days  between  late  October and early  December.  That  extension
    helped us maintain a higher yield while enhancing returns.

*   Because we believed  that rates would remain  unchanged for the near future,
    we  continued  to  extend  Prime's  average   maturity   through   February,
    lengthening to 82 days.

*   We extended  the average  maturity by adding  high-quality  certificates  of
    deposit  (CDs)  issued  by  international  banks  to  the  portfolio,  while
    decreasing  Prime's  commercial  paper (CP)  holdings.  The net result was a
    substantial increase in the portfolio's overall credit quality.

*   Going  forward,  we don't expect the Fed to change rates anytime soon, so we
    will probably keep Prime's average maturity longer than its historical norm.

*   To accomplish that strategy, we expect to maintain our concentration in CDs,
    which should also help to maintain the portfolio's high credit quality.

[left margin]

"PRIME CONTINUED TO PERFORM WELL, FINISHING AMONG THE TOP 20% OF ITS LIPPER
PEERS FOR THE YEAR ENDED FEBRUARY 28, 1999, BASED ON  TOTAL RETURN."

           PRIME MONEY MARKET(1)
                 (BPRXX)
TOTAL RETURNS:             AS OF 2/28/99
    6 Months                    2.40%(2)
    1 Year                         5.07%
NET ASSETS:                 $2.9 billion
7-DAY CURRENT YIELD:               4.49%
INCEPTION DATE:                 11/17/93

(1)  Investor Class.
(2)  Not annualized.

See Total Returns on page 4.

Investment terms are defined in the Glossary on pages 22 and 23.


2      1-800-345-2021


Money Market Funds--Frequently Asked Questions
- --------------------------------------------------------------------------------

CAN I MAKE DIRECT DEPOSITS INTO MY MONEY MARKET FUND ACCOUNT?

     Yes. You can arrange for direct deposit of your paycheck,  Social  Security
check,  Treasury Direct interest payment,  military allotment,  or payments from
other  government  agencies.  Give us a call, and we will send you the necessary
information to set it up.

WHAT IS THE HOLDING PERIOD ON NEW DEPOSITS INTO MY ACCOUNT?

     Generally,  there is an  eight-business-day  holding  period for  deposited
funds  (initial  investments  in a new account  are held for 15 calendar  days).
There is a  one-business-day  holding  period for U.S.  Treasury  checks,  money
orders, and travelers' checks.

IS THERE A LIMIT ON THE NUMBER OF CHECKS I CAN WRITE ON MY MONEY MARKET ACCOUNT?

     No. You can write as many checks as you like at no charge, as long as each
check is for $100 or more.

IS THERE AN EASY WAY TO MOVE  MONEY  FROM MY MONEY  MARKET  FUND INTO A STOCK OR
BOND FUND?

     Yes.  Moving money  between  funds is called an  exchange,  and there is no
limit  on the  number  of  exchanges  you can make  out of a money  market  fund
account.  However,  there is a limit of six  exchanges  per calendar year out of
stock and bond fund accounts.

     Exchanges can be made by:

*    visiting our Web site at
     www.americancentury.com*

*    using our Automated Information Line (1-800-345-8765)*

*    calling an Investor Relations Representative at 1-800-345-2021*

*    writing us a letter

HOW DO I DECIDE  WHETHER A TAXABLE MONEY MARKET FUND OR A TAX-FREE  MONEY MARKET
FUND IS RIGHT FOR ME?

     The most important  factor to consider is your tax bracket.  Tax-free money
market funds  typically  offer lower yields than taxable  funds,  but you pay no
federal income taxes on the income from a tax-free fund.

     If you are in one of the higher federal income tax brackets, taxes will eat
up a big part of your income from a taxable  money  market  fund,  so a tax-free
investment may be better for you. If you're in a lower tax bracket, then you can
usually earn more in a taxable fund even after taxes are deducted.

     We can help you  figure it out.  If you give us a call and tell us what tax
bracket  you're in, we can tell you whether you're likely to earn more after-tax
income in a tax-free or a taxable money market fund.

IF YOU HAVE ANY  QUESTIONS  ABOUT OUR MONEY MARKET  FUNDS,  CALL US TOLL FREE AT
1-800-345-2021 OR E-MAIL US AT OUR WEB SITE, WWW.AMERICANCENTURY.COM.

* Before an  investor  can make an exchange  via  calling an Investor  Relations
Representative,  using our Automated  Information Line, or via our Web site, the
shareholder must have first provided us with  authorization,  in writing,  to do
so.

[right margin]

A FASTER AND EASIER WAY TO DEPOSIT MUTUAL FUND DISTRIBUTIONS

If you prefer to get your fund dividend or capital gains  distributions  sent to
you  instead of  reinvesting  them,  there are a couple of ways that you can get
access to this money faster than waiting for a check in the mail:

*    YOU CAN HAVE DISTRIBUTIONS DEPOSITED DIRECTLY INTO YOUR MONEY MARKET
     ACCOUNT. The money will be deposited the same day that the distributions
     are paid.

*    DISTRIBUTIONS CAN BE SENT ELECTRONICALLY TO YOUR BANK ACCOUNT. The money
     will be available in your bank account within three days.

Contact  our  Investor  Relations  Representatives  to set up  either  of  these
options.


                                                  www.americancentury.com      3


Prime Money Market--Performance
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
TOTAL RETURNS AS OF FEBRUARY 28, 1999

                                         INVESTOR CLASS (INCEPTION 11/17/93)                     ADVISOR CLASS (INCEPTION 8/28/98)
                            PRIME       90-DAY TREASURY      MONEY MARKET INSTRUMENT FUNDS(2)         PRIME       90-DAY TREASURY
                        MONEY MARKET       BILL INDEX       AVERAGE RETURN     FUND'S RANKING      MONEY MARKET      BILL INDEX
                        ------------       ----------       --------------     --------------      ------------      ----------
<S>                      <C>                 <C>               <C>               <C>              <C>              <C>  
6 MONTHS(1) ............    2.40%             2.20%             2.25%                --                2.27%            2.20%
1 YEAR .................    5.07%             4.77%             4.76%           57 OUT OF 312           --               --
==============================================================================================================================
AVERAGE ANNUAL RETURNS
==============================================================================================================================
3 YEARS ................    5.13%             5.03%             4.84%           46 OUT OF 271           --               --
5 YEARS ................    5.18%             5.07%             4.84%           17 OUT OF 203           --               --
LIFE OF FUND ...........    5.09%             4.98%(3)          4.74%(3)        15 OUT OF 197(3)      2.31%(1)         2.20%(4)
</TABLE>

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Since  11/30/93,  the date nearest the class's  inception for which data are
    available.

(4) Since  8/31/98,  the date nearest the class's  inception  for which data are
    available.

See  pages  20-22  for  more  information  about  share  classes,  returns,  the
comparative index, and Lipper fund rankings.

PORTFOLIO AT A GLANCE
                                     2/28/99           2/28/98
NUMBER OF ISSUERS                      67                58
WEIGHTED AVERAGE
   MATURITY                          82 DAYS           65 DAYS
EXPENSE RATIO (FOR
   INVESTOR CLASS)                    0.58%             0.50%

YIELDS AS OF FEBRUARY 28, 1999
                                  INVESTOR CLASS
7-DAY CURRENT YIELD                   4.49%
7-DAY EFFECTIVE YIELD                 4.59%

Past performance does not guarantee future results.

Money market funds are neither  insured nor  guaranteed by the FDIC or any other
government agency.

Yields will fluctuate, and although the fund seeks to preserve the value of your
investment  at $1 per share,  it is possible to lose money by  investing  in the
fund. The 7-day yield more closely reflects  earnings of the fund than the total
return.


4      1-800-345-2021


Prime Money Market--Q&A
- --------------------------------------------------------------------------------
/photo of John Walsh and Denise Tabacco/

     An interview with John Walsh and Denise Tabacco,  portfolio managers on the
Prime Money Market fund investment team.

HOW DID THE FUND PERFORM FOR THE FISCAL YEAR ENDED FEBRUARY 28, 1999?

     Prime continued to perform well,  finishing among the top 20% of its Lipper
peers.  For the fiscal  year,  Prime's  Investor  Class shares  returned  5.07%,
compared  with the 4.76%  average  return of the 312  "Money  Market  Instrument
Funds" tracked by Lipper Inc. Prime's  longer-term returns are similarly strong.
(See the previous page for other fund performance comparisons.)

DESPITE PRIME'S SOLID PERFORMANCE, ITS YIELD DROPPED OVER THE LAST SIX MONTHS.
WHY?

     An overall  decline in interest rates provided the backdrop for the decline
in the fund's 7-day current yield, which slipped from 5.08% at the end of August
1998 to 4.49% by the end of February.

     Interest rates tend to fall when the economy weakens--lower  interest rates
help stimulate growth.  When it appeared that global economic turmoil might push
the U.S.  economy  toward  recession,  the  Federal  Reserve  (the Fed)  lowered
short-term  interest rates last year. And not just once, but three times between
late September and mid-November,  reducing  short-term rates a total of 75 basis
points (0.75%--a basis point equals 0.01%).

     As a result of those  reductions,  yields on money market securities headed
sharply lower.

IN LIGHT OF THE DECLINE IN INTEREST RATES, HOW DID YOU POSITION PRIME'S WEIGHTED
AVERAGE MATURITY (WAM)?

     We  lengthened  the fund's WAM a bit,  extending  to around 70 days between
late  October and early  December.  (WAM  indicates  the average  time until the
securities in a portfolio  mature,  weighted by dollar  amount.) That  extension
helped  us  maintain  a higher  yield  for  Prime  because  generally  speaking,
long-term  securities  yield more than short-term  ones. The longer WAM was also
one of the main factors leading to the fund's solid return for the period.

     We've  maintained  Prime's  longer WAM thus far in 1999,  but for different
reasons.  Global  economies  stabilized  somewhat in early  1999,  and with that
stabilization  came a change  in the  Fed's  stance  toward  interest  rates--in
Congressional testimony during February, the Fed's chairman hinted that the U.S.
central bank had officially shifted from a rate-lowering bias to a neutral one.

     Because that increased the likelihood that rates would remain unchanged for
the near future,  we continued to extend Prime's WAM,  lengthening to 82 days by
the end of February.

[right margin]

"AN OVERALL  DECLINE IN INTEREST  RATES PROVIDED THE BACKDROP FOR THE DECLINE IN
THE FUND'S YIELD, WHICH SLIPPED FROM 5.08% AT THE END OF AUGUST 1998 TO 4.49% BY
THE END OF FEBRUARY."

[pie charts - data below]

PORTFOLIO COMPOSITION BY SECURITY TYPE

AS OF FEBRUARY 28, 1999
Commercial Paper          62%
Variable-Rate Notes       19%
CDs                       11%
Asset-Backed Securities    4%
Other                      4%

AS OF AUGUST 31, 1998
Commercial Paper          71%
Variable-Rate Notes       18%
CDs                        5%
Asset-Backed Securities    5%
Other                      1%

Security types are defined on pages 22 and 23.


                                                  www.americancentury.com      5


Prime Money Market--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

HOW DID YOU ACCOMPLISH THE SHIFT IN PRIME'S WAM?

     The first step was to reallocate  some of the proceeds from the portfolio's
maturing  commercial paper (CP). As some of the securities  matured,  we allowed
Prime's CP exposure to fall from  roughly 71% at the end of August 1998 to about
62% by the end of February. (See the charts on the previous page.)

     We used the proceeds to double the portfolio's  exposure to certificates of
deposit (CDs).  Because many of the CDs we added were on the long end of Prime's
investment spectrum--maturing in about one year--we were able to extend the WAM.
By the end of February, roughly 11% of Prime's portfolio was invested in CDs, up
from around 5% at the end of August last year.

WHAT IMPACT DID THAT STRATEGY HAVE ON PRIME'S OVERALL CREDIT QUALITY?

     The  increase  in CDs and  the  decrease  in CP  substantially  raised  the
portfolio's overall credit quality. (See the table at left.) That's because most
of the CDs we added  were  issued  by  international  banks  with  solid  credit
ratings. By the end of February,  about 96% of the fund's holdings were A-1+, up
significantly from about 64% six months ago.

GOING FORWARD, WHAT'S YOUR OUTLOOK FOR INTEREST RATES AND THE U.S. ECONOMY?

     The U.S.  economy was bolstered by the Fed's interest rate cuts but remains
vulnerable to financial events overseas. Consumer confidence and spending remain
one of the main  drivers of the  economy,  which  expanded at an  annualized  6%
during the final quarter of 1998--the  fastest  quarterly  expansion in over two
years.  Nevertheless,  there's  still some mild  weakness in the  corporate  and
manufacturing sectors, and inflation remains tame.

     In light of those somewhat  mixed signals,  we think that the Fed is likely
to maintain the same  "wait-and-see"  approach  toward  interest rates that it's
taken so far this year. That argues for greater overall  interest rate stability
for the near term.  But because market  expectations  can  significantly  impact
interest rates, we could see some intermittent  bouts of volatility as investors
attempt to gauge inflation prospects and future Fed actions.

GIVEN THAT OUTLOOK, WHAT ARE YOUR IMMEDIATE PLANS FOR PRIME?

     Steady as she goes for now. Because we don't expect the Fed to change rates
anytime soon, we will probably keep Prime's WAM longer than its historical norm.
That should help enhance the fund's yield and add to returns. To accomplish that
strategy,  we expect to keep our concentration in CDs, which should also help to
maintain the portfolio's high overall credit quality.

[left margin]

"BECAUSE  MANY OF THE CDS WE ADDED  WERE ON THE LONG END OF  PRIME'S  INVESTMENT
SPECTRUM --MATURING IN ABOUT ONE YEAR-- WE WERE ABLE TO EXTEND THE WAM."

PORTFOLIO COMPOSITION BY CREDIT RATING
                     % OF FUND INVESTMENTS
                    AS OF             AS OF
                   2/28/99           8/31/98
A-1+                 96%               64%
A-1                   4%               34%
A-2                  --                 2%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 21
for more information.

"BECAUSE WE DON'T EXPECT THE FED TO CHANGE RATES  ANYTIME SOON, WE WILL PROBABLY
KEEP PRIME'S WAM LONGER THAN ITS HISTORICAL NORM."


6      1-800-345-2021


Prime Money Market--Schedule of Investments
- --------------------------------------------------------------------------------

FEBRUARY 28, 1999

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
COMMERCIAL PAPER(1)--62.4%
AUTOMOBILES & AUTO PARTS--0.6%
             $ 17,000,000  BMW U.S. Capital Corp., 4.80%,
                              4/29/99                             $   16,866,267
                                                                 ---------------
BANKING--12.6%
               25,000,000  Abbey National North America
                              Corp., 4.76%, 6/7/99                    24,675,919
               22,000,000  ANZ (Delaware) Inc., 5.03%,
                              3/17/99                                 21,950,818
               10,000,000  Banco de Galicia y Buenos Aires
                              S.A. de C.V., 4.86%, 8/19/99
                              (LOC: Bayerische Hypo-Und
                              Vereinsbank, A.G.)                       9,769,150
               17,000,000  BIL North America, Inc., 4.98%,
                              4/7/99                                  16,912,989
                5,000,000  First Union National Bank, 4.80%,
                              8/19/99                                  4,886,000
               42,500,000  Generale Bank, Inc., 4.83%-4.89%,
                              4/7/99-4/26/99                          42,236,652
               20,000,000  Lloyds Bank Plc, 4.81%, 7/7/99             19,657,956
              100,000,000  National Australia Bank Ltd. SA,
                              4.77%-4.99%,
                              3/22/99-5/24/99                         99,325,512
               84,286,000  Spintab-Swedmortgage AB,
                              4.84%-5.06%,
                              4/12/99-8/13/99                         83,260,246
               40,000,000  Unibanco-Uniao de Bancos
                              Brasileiros S.A. Grand Cayman,
                              5.45%-5.48%,
                              4/15/99-6/28/99 (LOC:
                              Bayerische Hypo-Und
                              Vereinsbank, A.G.)                      39,502,694
                                                                 ---------------
                                                                     362,177,936
                                                                 ---------------
CHEMICALS & RESINS--1.0%
               30,000,000  du Pont (E.I.) de Nemours & Co.,
                              4.87%, 5/27/99                          29,646,925
                                                                 ---------------
CREDIT CARD & TRADE RECEIVABLES--6.8%
               65,000,000  Corporate Receivables Corp.,
                              4.83%-5.25%,
                              3/3/99-5/5/99 (Acquired
                              11/9/98-2/11/99,
                              Cost $64,236,154)(2)                    64,717,113
              132,000,000  Dakota Certificates (Citibank),
                              4.79%-5.10%,
                              3/12/99-6/2/99 (Acquired
                              12/10/98-2/18/99, Cost
                              $130,290,930)(2)                       130,995,372
                                                                 ---------------
                                                                     195,712,485
                                                                 ---------------
ENERGY (PRODUCTION & MARKETING)--13.1%
                5,000,000  Chevron Transport Corp., 4.84%,
                              4/8/99 (Acquired 2/19/99,
                              Cost $4,967,733)(2)                      4,974,456

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
$              44,000,000  Chevron Transport Corp.,
                              4.84%-5.09%,
                              3/4/99-5/20/99                      $   43,871,507
               34,000,000  Chevron U.K. Investment PLC,
                              4.84%-5.00%,
                              3/19/99-4/27/99                         33,811,732
               62,000,000  Equilon Enterprises LLC,
                              4.79%-5.09%,
                              3/12/99-4/28/99                         61,725,118
               66,000,000  Motiva Enterprises LLC,
                              5.11%-5.18%,
                              3/4/99-3/11/99                          65,935,582
               74,350,000  Petrobras International Finance 
                              Co., 4.82%-5.05%,
                              3/9/99-9/8/99 (LOC:
                              Barclays Bank PLC)                      73,703,973
               94,468,000  Sand Dollar Funding LLC,
                              4.83%-4.87%,
                              3/12/99-4/29/99 (Acquired
                              1/7/99-1/26/99, Cost
                              $93,465,537)(2)                         94,051,525
                                                                 ---------------
                                                                     378,073,893
                                                                 ---------------
FINANCIAL SERVICES--19.4%
               15,000,000  Deutsche Bank Financial, Inc.,
                              4.83%, 5/11/99 (Acquired
                              2/10/99, Cost $14,818,875)(2)           14,857,113
               54,000,000  Falcon Asset Securities Corp.,
                              4.86%-4.88%,
                              3/15/99-4/20/99 (AMBAC)
                              (Acquired 2/17/99-2/26/99,
                              Cost $53,707,576)(2)                    53,761,082
               10,000,000  Finans Funding Corp. II, 4.85%,
                              6/3/99                                   9,873,361
               30,000,000  Garanti Funding Corp. I, 4.78%,
                              8/2/99 (LOC: Bayerische
                              Hypo-Und Vereinsbank, A.G.)             29,386,567
               24,000,000  Garanti Funding Corp. II,
                              4.79%-4.80%,
                              7/29/99-7/30/99                         23,519,425
               80,300,000  General Electric Capital Corp.,
                              4.59%-5.46%,
                              3/1/99-6/25/99                          79,705,055
               61,000,000  General Electric Financial
                              Assurance Holdings,
                              4.84%-4.90%,
                              3/9/99-5/17/99                          60,635,842
               45,000,000  Morgan Stanley Dean Witter,
                              Discover & Co., 4.80%-5.23%,
                              3/5/99-4/5/99                           44,867,553
               10,000,000  Toyota Motor Credit Corp., 4.85%,
                              3/3/99                                   9,997,305
               71,650,000  Transamerica Asset Funding Corp.,
                              4.86%-5.20%,
                              3/12/99-5/13/99 (Acquired
                              12/7/98-2/26/99, Cost
                              $70,840,404)(2)                         71,131,464

See Notes to Financial Statements


                                                  www.americancentury.com      7


Prime Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
FEBRUARY 28, 1999

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
$              25,000,000  WCP Funding Inc., 4.81%,
                              5/4/99 (AMBAC) (Acquired
                              2/1/99, Cost $24,692,694)(2)        $   24,786,222
              138,505,000  Windmill Funding Corp.,
                              4.84%-5.13%,
                              3/2/99-4/16/99 (LOC: ABN
                              Amro Bank N.V.) (Acquired
                              12/17/98-2/25/99, Cost
                              $137,138,363)(2)                       137,886,358
                                                                 ---------------
                                                                     560,407,347
                                                                 ---------------
INDUSTRIAL--0.3%
                8,000,000  Siebe plc, 4.92%, 3/1/99
                              (Acquired 10/23/98, Cost
                              $7,858,960)(2)                           8,000,000
                                                                 ---------------
INSURANCE--7.0%
               95,200,000  Marsh &  McLennan Companies, 
                              Inc., 5.18%-5.38%,
                              3/24/99-5/21/99 (Acquired 
                              8/26/98-11/12/98, Cost
                              $92,446,515)(2)                         94,530,507
               57,000,000  Prudential Funding Corp., 4.79%,
                              4/22/99-4/30/99                         56,571,561
               50,000,000  SAFECO Corp., 4.91%-5.15%,
                              3/8/99-4/19/99 (Acquired
                              12/4/98-1/5/99, Cost
                              $49,284,296)(2)                         49,771,781
                                                                 ---------------
                                                                     200,873,849
                                                                 ---------------
PRINTING & PUBLISHING--0.2%
                5,000,000  Reed Elsevier Inc., 4.83%,
                              3/26/99 (Acquired 12/31/98,
                              Cost $4,942,979)(2)                      4,983,229
                                                                 ---------------
RUBBER & PLASTICS--0.5%
               16,000,000  Formosa Plastics Corp. USA,
                              4.85%, 4/13/99 (LOC: Bank
                              of America N.T & S.A.)                  15,907,311
                                                                 ---------------
UTILITIES--0.9%
               25,000,000  National Rural Utilities
                              Cooperative Finance Corp.,
                              4.95%, 4/26/99                          24,807,500
                                                                 ---------------
TOTAL COMMERCIAL PAPER                                             1,797,456,742
                                                                 ---------------

U.S. GOVERNMENT AGENCY DISCOUNT NOTES(3)--1.6%
               25,000,000  FFCB Discount Notes, 4.75%,
                              12/27/99                                24,007,118
               23,000,000  FNMA Discount Notes, 4.50%,
                              6/18/99                                 22,686,625
                                                                 ---------------
TOTAL U.S. GOVERNMENT AGENCY
DISCOUNT NOTES                                                        46,693,743
                                                                 ---------------

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
U.S. GOVERNMENT AGENCY SECURITIES(3)--1.9%
$              20,000,000  FHLB, 5.63%, 5/5/99                    $   20,029,493
                5,600,000  FNMA MTN, 5.63%, 5/5/99                     5,605,710
                5,000,000  FNMA MTN, 6.29%, 5/7/99                     5,011,229
               25,000,000  SLMA MTN, 5.05%, 1/19/00                   25,000,000
                                                                 ---------------
TOTAL U.S. GOVERNMENT
AGENCY SECURITIES                                                     55,646,432
                                                                 ---------------

CORPORATE DEBT--13.7%
BANKING--0.3%
               10,000,000  Banc One Corp. MTN, VRN,
                              4.78%, 3/2/99, resets weekly
                              off the Federal Funds rate plus
                              0.03% with no caps                       9,998,249
                                                                 ---------------
FINANCIAL SERVICES--4.0%
               30,000,000  Abbey National Treasury 
                              Services PLC MTN, VRN,
                              4.77%, 3/15/99, resets 
                              monthly off the 1-month
                              LIBOR minus
                              0.165% with no caps                     29,990,942
               30,000,000  Credit Suisse First Boston Inc.
                              MTN, VRN, 5.00%, 3/1/99, 
                              resets daily off the
                              Federal Funds rate plus 
                              0.11% with no caps
                              (Acquired 4/15/98-
                              7/23/98, Cost $30,000,000)(2)           30,000,000
               20,000,000  General Electric Capital Corp.
                              MTN, Series A, VRN, 5.14%, 
                              3/4/99, resets
                              quarterly off the 3-month 
                              LIBOR minus 0.135% with
                              no caps                                 19,997,190
               25,000,000  General Electric Capital Corp., 
                              VRN, 4.89%, 4/16/99, resets
                              quarterly off the 3-month LIBOR
                              minus 0.08% with no
                              caps                                    25,000,000
               10,000,000  Merrill Lynch & Co., Inc. MTN,
                              Series B, VRN,  5.21%,
                              4/6/99, resets quarterly off the
                              3-month LIBOR plus 0.15%
                              with no caps                            10,002,032
                                                                 ---------------
                                                                     114,990,164
                                                                 ---------------
INSURANCE--9.4%
              100,000,000  General American Life Insurance 
                              Company, VRN, 5.14%, 3/1/99, 
                              resets monthly off the 1-month
                              LIBOR plus 0.20% with no caps 
                              (Acquired 1/3/97-7/7/97, Cost
                              $100,000,000)(2)                       100,000,000

                        See Notes to Financial Statements


8      1-800-345-2021


Prime Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
FEBRUARY 28, 1999

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
$              45,000,000  Jackson National Life Insurance
                              Co., VRN,  5.13%, 3/10/99,
                              resets monthly off the 1-month
                              LIBOR plus 0.19% with no
                              caps (Acquired 6/10/98, Cost
                              $45,000,000)(2)                     $   45,000,000
               55,000,000  Transamerica Life Insurance Co.,
                              VRN, 5.07%, 3/1/99, resets 
                              monthly off the 1-month
                              LIBOR plus 0.13% with no caps 
                              (Acquired  11/4/98, Cost
                              $55,000,000)(2)                         55,000,000
               70,400,000  Travelers Insurance Company (The),
                              VRN, 4.98%, 3/9/99-3/22/99,  
                              resets monthly off the 1-month
                              LIBOR plus 0.04% with no caps 
                              (Acquired 5/22/98-6/8/98,
                              Cost $70,400,000)(2)                    70,400,000
                                                                 ---------------
                                                                     270,400,000
                                                                 ---------------
TOTAL CORPORATE DEBT                                                 395,388,413
                                                                 ---------------

ASSET-BACKED SECURITIES--4.0%
                   98,213  Americredit Automobile Receivables Trust,
                              Series 1998 B, Class A1 SEQ, 5.63%,
                              6/12/99                                     98,213
                8,329,312  Americredit Automobile Receivables Trust,
                              Series 1998 C, Class A1 SEQ, 5.64%,
                              9/12/99                                  8,329,312
               18,108,874  Americredit Automobile Receivables Trust,
                              Series 1998 D, Class A1 SEQ, 5.20%,
                              11/12/99                                18,108,874
               13,000,000  Americredit Automobile Receivables Trust,
                              Series 1999 A, Class A1 SEQ, 4.98%,
                              3/12/00                                 13,000,000
                7,357,887  Caterpillar Financial Asset Trust,
                              Series 1998 A, Class A1 SEQ,
                              5.64%, 7/26/99                           7,357,887
               23,462,134  Ford Credit Auto Owner Trust,
                              Series 1999 A, Class A1 SEQ,
                              5.01%, 7/15/99                          23,462,134
               20,144,319  Household Automobile Revolving Trust I,
                              Series 1998-1, Class A1 SEQ, 
                              5.33%, 12/17/99                         20,144,319
               23,000,000     WFS Financial Owner Trust, 
                              Series 1999 A, Class A1 SEQ,
                              5.01%, 2/20/00 (FSA)                    23,000,000
                                                                 ---------------
TOTAL ASSET-BACKED SECURITIES                                        113,500,739
                                                                 ---------------

CERTIFICATES OF DEPOSIT--11.3%
               41,500,000  Abbey National Treasury Services
                              PLC, 5.04%, 2/8/00                      41,487,844

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
$              18,500,000  Bayerische Landesbank
                              Girozentrale (New York), 4.94%,
                              11/19/99                            $   18,499,913
               28,000,000  Commerzbank AG (New York),
                              5.08%, 9/28/99                          28,005,650
               60,000,000  Deutsche Bank AG, (New York)
                              5.70%-5.74%,
                              3/5/99-5/12/99                          59,996,618
               75,000,000  National Westminster Bank PLC
                              (New York), 4.98%-5.06%,
                              1/10/00-2/9/00                          74,983,173
               51,000,000  Royal Bank of Canada (New
                              York), 5.07%-5.12%,
                              2/10/00-2/18/00                         50,983,744
               13,000,000  Union Bank of California, 5.00%,
                              5/3/99                                  13,000,000
               38,600,000  Westdeutsche Landesbank (New
                              York), 4.90%-5.13%,
                              9/15/99-10/12/99                        38,609,934
                                                                 ---------------
TOTAL CERTIFICATES OF DEPOSIT                                        325,566,876
                                                                 ---------------

BANK NOTES--5.1%
               22,000,000  American Express Centurion Bank, 
                              VRN, 4.88%, 3/9/99-3/16/99, 
                              resets monthly off the 
                              1-month LIBOR
                              minus 0.06% with no caps                22,000,000
               21,000,000  American Express Centurion Bank,
                              VRN, 4.88%, 3/18/99, resets
                              monthly off the 1-month LIBOR
                              minus 0.055% with no caps               21,000,000
               10,000,000  American Express Centurion Bank,
                              VRN, 4.97%, 3/8/99, resets
                              monthly off the 1-month LIBOR
                              plus 0.03% with no caps                 10,000,921
               25,000,000  First National Bank of Chicago,
                              4.85%, 5/19/99                          25,000,000
               25,000,000  KeyBank N.A., VRN, 4.89%,
                              3/23/99, resets monthly off
                              the 1-month LIBOR minus
                              0.045% with no caps                     24,997,918
               15,000,000  U.S. Bank NA Minnesota, VRN,
                              4.82%, 3/17/99, resets
                              monthly off the 1-month LIBOR
                              minus 0.12% with no caps                14,998,382
               30,000,000  U.S. Bank NA Minnesota, VRN,
                              4.88%, 3/8/99, resets monthly
                              off the 1-month LIBOR minus
                              0.06% with no caps                      29,996,431
                                                                 ---------------
TOTAL BANK NOTES                                                     147,993,652
                                                                 ---------------
TOTAL INVESTMENT SECURITIES--100.0%                               $2,882,246,597
                                                                 ===============

See Notes to Financial Statements


                                                  www.americancentury.com      9


Prime Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
FEBRUARY 28, 1999

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

FFCB = Federal Farm Credit Bank

FHLB = Federal Home Loan Bank

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

LIBOR = London Interbank Offered Rate

LOC = Letter of Credit

MTN = Medium Term Note

SLMA = Student Loan Marketing Association

resets = The frequency with which a security's coupon changes,  based on current
market conditions or an underlying index. The more frequently a security resets,
the less risk the  investor is taking  that the coupon  will vary  significantly
from current market rates.

VRN =  Variable  Rate  Note.  Interest  reset  date  is  indicated  and  used in
calculating the weighted  average  portfolio  maturity.  Rate shown is effective
February 28, 1999.

(1)  The rates for commercial paper are the yield to maturity at purchase.

(2)  Security was  purchased  under Rule 144A or section 4(2) of the  Securities
     Act of 1933 or is a private  placement and, unless registered under the Act
     or exempted from registration,  may only be sold to qualified institutional
     investors.  The aggregate  value of  restricted  securities at February 28,
     1999, was $1,054,846,222 which represented 36.9% of net assets.  Restricted
     securities considered illiquid represent 6.0% of net assets.

(3)  The  rates  for U.S.  Government  Agency  Discount  Notes  are the yield to
     maturity at purchase. The rates for other U.S. Government Agency securities
     are the stated coupon rates.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the amortized cost of each investment

* the percentage of total investments in each industry, as applicable

* the percent and dollar breakdown of each investment category

                        See Notes to Financial Statements


10      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

FEBRUARY 28, 1999

ASSETS
Investment securities, at value
  (amortized cost and
  cost for federal income tax purposes) ................        $ 2,882,246,597
Cash ...................................................              4,988,271
Interest receivable ....................................             10,128,723
                                                                ---------------
                                                                  2,897,363,591
                                                                ---------------
LIABILITIES
Disbursements in excess
  of demand deposit cash ...............................             15,126,095
Payable for capital shares redeemed ....................             25,108,138
Accrued management fees (Note 2) .......................              1,305,027
Distribution and service fee
  payable (Note 2) .....................................                  1,217
Dividends payable ......................................                721,928
Payable for trustees' fees
  and expenses .........................................                  6,019
                                                                ---------------
                                                                     42,268,424
                                                                ---------------

Net Assets .............................................        $ 2,855,095,167
                                                                ===============

NET ASSETS CONSIST OF:
Capital paid in ........................................        $ 2,855,451,853
Accumulated net realized loss
  on investment transactions ...........................               (356,686)
                                                                ---------------
                                                                $ 2,855,095,167
                                                                ===============

Investor Class
Net assets .............................................        $ 2,851,880,307
Shares outstanding .....................................          2,852,236,973
Net asset value per share ..............................        $          1.00

Advisor Class
Net assets .............................................        $     3,214,860
Shares outstanding .....................................              3,214,880
Net asset value per share ..............................        $          1.00

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns,  you get the fund's net assets.  For each class of shares,  the net assets
divided  by the total  number of  shares  outstanding  gives you the price of an
individual share, or the net asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); and
net gains earned on investments  but not yet paid to  shareholders or net losses
on investments (known as realized gains or losses). This breakdown tells you the
value of net assets that are  performance-related,  such as investment  gains or
losses, and the value of net assets that are not related to performance, such as
shareholder investments and redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      11


Statement of Operations
- --------------------------------------------------------------------------------

YEAR ENDED FEBRUARY 28, 1999

INVESTMENT INCOME
Income:
Interest ...............................................          $ 118,945,493
                                                                  -------------
Expenses (Note 2):
Management fees ........................................             12,859,387
Distribution fees -- Advisor Class .....................                  3,673
Service fees -- Advisor Class ..........................                  3,673
Trustees' fees and expenses ............................                 78,852
                                                                  -------------
  Total expenses .......................................             12,945,585
Amount waived ..........................................               (360,585)
                                                                  -------------
  Net expenses .........................................             12,585,000
                                                                  -------------
Net investment income ..................................            106,360,493
                                                                  -------------

REALIZED LOSS ON INVESTMENTS
Net realized loss on investments .......................                (18,522)
                                                                  -------------
Net Increase in Net Assets
  Resulting from Operations ............................          $ 106,341,971
                                                                  =============

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement  breaks out how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

See Notes to Financial Statements


12      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

YEARS ENDED FEBRUARY 28, 1999 AND FEBRUARY 28, 1998

Increase in Net Assets                               1999                 1998

OPERATIONS
Net investment income ....................   $   106,360,493    $    67,224,070
Net realized gain (loss)
  on investments .........................           (18,522)            24,038
                                             ---------------    ---------------
Net increase in net assets
  resulting from operations ..............       106,341,971         67,248,108
                                             ---------------    ---------------

DISTRIBUTIONS TO
SHAREHOLDERS From net investment income:
  Investor Class .........................      (106,293,927)       (67,224,070)
  Advisor Class ..........................           (66,566)              --
                                             ---------------    ---------------
Decrease in net assets
  from distributions .....................      (106,360,493)       (67,224,070)
                                             ---------------    ---------------

CAPITAL SHARE
TRANSACTIONS (NOTE 3)
Net increase in net assets
  from capital share transactions ........     1,437,803,002        205,296,326
                                             ---------------    ---------------
Net increase in net assets ...............     1,437,784,480        205,320,364

NET ASSETS
Beginning of period ......................     1,417,310,687      1,211,990,323
                                             ---------------    ---------------
End of period ............................   $ 2,855,095,167    $ 1,417,310,687
                                             ===============    ===============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much the fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income distributed to shareholders

* share transactions--shareholders' purchases, reinvestments, and redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      13


Notes to Financial Statements
- --------------------------------------------------------------------------------

FEBRUARY 28, 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     ORGANIZATION -- American Century Investment Trust (the trust) is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company.  Prime  Money  Market  Fund (the  fund) is the only fund  issued by the
trust.  The fund seeks the  highest  level of  current  income  consistent  with
preservation  of capital.  The fund buys high quality (first tier),  U.S. dollar
denominated money market instruments and other short-term  obligations of banks,
governments,  and  corporations.  The fund is 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 fund  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 commenced
August 28, 1998. The following significant accounting policies are in accordance
with generally accepted accounting principles;  these principles may require the
use of estimates by fund management.

     SECURITY  VALUATIONS  --  Securities  are valued at amortized  cost,  which
approximates  current market value.  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 as of the
trade date. 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.  Discounts and
premiums are accreted/amortized daily on a straight-line basis.

     INCOME TAX  STATUS -- It is the fund's  policy to  distribute  all  taxable
income 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 -- Distributions  from net investment income are declared and
credited daily and distributed  monthly. The fund does not expect to realize any
long-term  capital gains,  and  accordingly,  does not expect to pay any capital
gains distributions.

     Accumulated net realized  capital loss carryovers of $356,686  (expiring in
2001 through 2007) may be used to offset future taxable gains.

     ADDITIONAL  INFORMATION  -- Funds  Distributor,  Inc.  (FDI) is the trust's
distributor. Certain officers of FDI are also officers of the trust.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The trust has entered into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (ACIM)  that  provides  the 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 fee is calculated daily
and paid monthly. It consists of an Investment Category Fee based on the average
net assets of the funds in a specific fund's  investment  category and a Complex
Fee based on the average net assets of all the funds managed by ACIM.  The rates
for the Investment  Category Fee range from 0.2570% to 0.3700% and the rates for
the Complex Fee  (Investor  Class)  range from  0.2900% to 0.3100%.  The Advisor
Class is  0.2500%  less at each  point  within  the  range.  For the year  ended
February 28, 1999, the effective  annual  Investor  Class  management fee net of
amount waived,  was 0.58%.  ACIM waived expenses which exceeded 0.50% of average
daily net assets through May 31, 1998.

     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 fund will pay ACIM an annual
distribution  fee equal to 0.25% and annual 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,


14      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)

FEBRUARY 28, 1999

and financial  institutions that have entered into sales agreements with respect
to shares of the fund. The service fee provides compensation for shareholder and
administrative  services  rendered by ACIM, its affiliates or independent  third
party  providers.  Fees  incurred  by the fund under the plan  during the period
August 28, 1998 through February 28, 1999 were $7,346.

    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, and the
trust's transfer agent, American Century Services Corporation.

- --------------------------------------------------------------------------------
3. CAPITAL SHARE TRANSACTIONS

  Transactions in shares of the fund were as follows (unlimited number of shares
authorized):

                                                SHARES                AMOUNT
INVESTOR CLASS
Year ended  February 28, 1999
Sold ...................................      4,559,290,594     $ 4,559,290,594
Issued in connection with
  acquisition (Note 4) .................      1,201,153,326       1,201,069,659
Issued in reinvestment
  of distributions .....................        100,856,205         100,856,205
Redeemed ...............................     (4,426,628,336)     (4,426,628,336)
                                            ---------------     ---------------
Net increase ...........................      1,434,671,789     $ 1,434,588,122
                                            ===============     ===============

Year ended  February 28, 1998
Sold ...................................      2,330,994,339     $ 2,330,994,339
Issued in reinvestment
  of distributions .....................         63,902,564          63,902,564
Redeemed ...............................     (2,189,600,577)     (2,189,600,577)
                                            ---------------     ---------------
Net increase ...........................        205,296,326     $   205,296,326
                                            ===============     ===============

ADVISOR CLASS
Period ended  February 28, 1999(1)
Sold ...................................          1,319,681     $     1,319,681
Issued in connection with
  acquisition (Note 4) .................          2,242,355           2,242,355
Issued in reinvestment
  of distributions .....................             65,984              65,984
Redeemed ...............................           (413,140)           (413,140)
Net increase ...........................          3,214,880     $     3,214,880

(1) August 28, 1998 (acquisition date -- see Note 4) through February 28, 1999.


                                                 www.americancentury.com      15


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
FEBRUARY 28, 1999

- --------------------------------------------------------------------------------
4. REORGANIZATION PLAN

     On August 28, 1998, Prime Money Market Fund (Prime) acquired all of the net
assets of the  American  Century - Benham  Cash  Reserve  Fund  (Cash  Reserve),
pursuant  to  a  plan  of   reorganization   approved  by  the  acquired  fund's
shareholders on August 7, 1998.  Prime is the surviving fund for the purposes of
maintaining   the  financial   statements   and   performance   history  in  the
post-reorganization.

     The acquisition was  accomplished by a tax-free  exchange of  1,201,153,326
shares of Prime Investor Class for 1,201,153,326 shares of Cash Reserve Investor
Class outstanding on August 28, 1998 and 2,242,355 shares of Prime Advisor Class
for 2,242,355  shares of Cash Reserve  Advisor Class  outstanding  on August 28,
1998.  Immediately  before  the  acquisition,  the  net  assets  of  Prime  were
$1,641,758,871,  consisting only of the Investor  Class.  The net assets of Cash
Reserve  immediately before the acquisition were  $1,203,312,014,  consisting of
$1,201,069,659  Investor  Class net  assets  and  $2,242,355  Advisor  Class net
assets.  Immediately after the acquisition,  the combined net assets of the fund
were $2,845,070,885, which consisted of $2,842,828,530 Investor Class net assets
and $2,242,355 Advisor Class net assets.

     Prime  acquired  capital  loss  carryforwards  of $83,667.  These  acquired
capital loss  carryforwards  are subject to  limitations  on their use under the
Internal Revenue Code, as amended.

5. SUBSEQUENT EVENTS

   The following name change became effective March 1, 1999:

              ==================================================================
               NEW NAME                  FORMER NAME
              ==================================================================

   FUND:       Prime Money Market Fund   American Century - Benham Prime Money
                                         Market Fund


16      1-800-345-2021


<TABLE>
<CAPTION>
Prime Money Market--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED FEBRUARY 28 (EXCEPT AS NOTED)

                                                                         Investor Class
                                          1999              1998              1997            1996(1)             1995
PER-SHARE DATA
<S>                                  <C>               <C>               <C>               <C>               <C>          
Net Asset Value, Beginning of Year   $        1.00     $        1.00     $        1.00     $        1.00     $        1.00
                                     -------------     -------------     -------------     -------------     -------------
Income From Investment Operations

  Net Investment Income ..........            0.05              0.05              0.05              0.06              0.05
                                     -------------     -------------     -------------     -------------     -------------
Distributions
  From Net Investment Income .....           (0.05)            (0.05)            (0.05)            (0.06)            (0.05)
                                     -------------     -------------     -------------     -------------     -------------
Net Asset Value, End of Year .....   $        1.00     $        1.00     $        1.00     $        1.00     $        1.00
                                     =============     =============     =============     =============     =============
  Total Return(2) ................            5.07%             5.29%             5.04%             5.60%             4.93%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
  to Average Net Assets ..........            0.58%             0.50%             0.50%             0.48%             0.04%
Ratio of Operating Expenses
  to Average
Net Assets (Before Expense Waiver)            0.60%             0.63%             0.63%             0.62%             0.71%
Ratio of Net Investment Income
  to Average Net Assets ..........            4.91%             5.17%             4.92%             5.43%             5.28%
Ratio of Net Investment Income
  to Average  Net Assets
  (Before Expense Waiver) ........            4.89%             5.04%             4.79%             5.29%             4.61%
Net Assets, End of Year
  (in thousands) .................   $   2,851,880     $   1,417,311     $   1,211,990     $   1,270,653     $   1,509,863
</TABLE>

(1)  Year ended February 29, 1996.

(2)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years (or less, if the class is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income

* income distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

See Notes to Financial Statements


                                                 www.americancentury.com      17


Prime Money Market--Financial Highlights
- --------------------------------------------------------------------------------

                        FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD INDICATED

                                              Advisor Class
                                                 1999(1)
PER-SHARE DATA
Net Asset Value, Beginning of Period .........    $1.00
                                                ---------
Income From Investment Operations
  Net Investment Income ......................    0.02
                                                ---------
Distributions
  From Net Investment Income .................   (0.02)
                                                ---------
Net Asset Value, End of Period ...............    $1.00
                                                =========
  Total Return(2) ............................    2.31%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
  to Average Net Assets ......................  0.85%(3)
Ratio of Net Investment Income
  to Average Net Assets ......................  4.53%(3)
Net Assets, End of Period
  (in thousands) .............................   $3,215

(1)  August 28, 1998 (acquisition date -- see Note 4) through February 28, 1999.

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

(3)  Annualized.

See Notes to Financial Statements


18      1-800-345-2021


Report of Independent Accountants
- --------------------------------------------------------------------------------

To the Trustees and Shareholders of the  Prime Money Market Fund:

In our opinion, the accompanying statement of assets and liabilities,  including
the schedule of portfolio investments,  and the related statements of operations
and of changes in net assets and the financial highlights present fairly, in all
material  respects,  the  financial  position  of the Prime Money  Market  Fund,
formerly the American  Century - Benham Prime Money Market Fund, (the "Fund") at
February 28, 1999,  and the results of its  operations  for the year then ended,
the changes in its net assets and the financial  highlights  for each of the two
years in the period then ended, in conformity with generally accepted accounting
principles.  These  financial  statements  and financial  highlights  (hereafter
referred to as  "financial  statements")  are the  responsibility  of the Fund's
management;  our  responsibility  is to express  an  opinion on these  financial
statements based on our audits.  The financial  highlights for each of the three
years in the period ended  February 28,  1997,  were audited by other  auditors,
whose report,  dated April 4, 1997,  expressed an  unqualified  opinion on those
highlights.  We conducted our audits of these financial statements in accordance
with  generally  accepted  auditing  standards,  which  require that we plan and
perform the audit to obtain  reasonable  assurance  about  whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements,  assessing the accounting  principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe  that our  audits,  which  included  confirmation  of  securities  at
February 28, 1999 by  correspondence  with the  custodian,  provide a reasonable
basis for the opinion expressed above.

                                                      PricewaterhouseCoopers LLP

Kansas City, Missouri
March 29, 1999


                                                 www.americancentury.com      19

Share Class and Retirement Account Information
- --------------------------------------------------------------------------------

SHARE CLASSES

     Two classes of shares are authorized for sale by the fund: Investor Class
and Advisor Class.

     INVESTOR CLASS  shareholders  do not pay any  commissions or other fees for
purchase  of fund shares  directly  from  American  Century.  Investors  who buy
Investor  Class  shares  through  a  broker-dealer  may be  required  to pay the
broker-dealer a transaction fee. THE PRICE AND PERFORMANCE OF THE INVESTOR CLASS
SHARES ARE LISTED IN NEWSPAPERS. NO OTHER CLASS IS CURRENTLY LISTED.

     ADVISOR  CLASS shares are sold  through  banks,  broker-dealers,  insurance
companies,  and financial advisors.  Advisor Class shares are subject to a 0.50%
Rule 12b-1  service and  distribution  fee. Half of that fee is available to pay
for recordkeeping and administrative  services, and half is available to pay for
distribution  services provided by the financial  intermediary through which the
Advisor Class shares are purchased. The total expense ratio of the Advisor Class
is 0.25% higher than the total expense ratio of the Investor Class.

     Both  classes  of  shares  represent  a pro rata  interest  in the fund and
generally have the same rights and preferences.

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 rollover 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.


20      1-800-345-2021


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 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

     PRIME MONEY  MARKET is a money  market fund that seeks to provide  interest
income by  investing  in a  diversified  portfolio  of  short-term  money market
securities.  The fund must  maintain a weighted  average  maturity of 90 days or
less.

     An  investment in Prime Money Market is neither  insured nor  guaranteed by
the FDIC or any other government agency. Yields will fluctuate, and although the
fund seeks to  preserve  the value of your  investment  at $1 per  share,  it is
possible to lose money by investing in the fund.

COMPARATIVE INDICES

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

     The 90-DAY  TREASURY BILL INDEX is derived from secondary  market  interest
rates as published by the Federal Reserve Bank.

LIPPER RANKINGS

     LIPPER INC. is an independent mutual fund ranking service that groups funds
according to their investment  objectives.  Rankings are based on average annual
returns for each fund in a given  category for the periods  indicated.  Rankings
are not included for periods less than one year.

     The Lipper category for the Prime Money Market fund is:

     MONEY MARKET  INSTRUMENT  FUNDS--funds that intend to maintain a stable net
asset value and that invest in high-quality  financial  instruments rated in the
top two grades with dollar-weighted average maturities of less than 90 days.

CREDIT RATING GUIDELINES

     Credit  quality (the  issuer's  financial  strength and the  likelihood  of
timely  payment of  interest  and  principal)  is a key  factor in  fixed-income
investment  analysis.  Credit ratings issued by independent  rating and research
companies such as Standard & Poor's help quantify credit  quality--the  stronger
the issuer,  the higher the credit rating.  In turn,  credit quality and ratings
greatly influence the prices and yields of fixed-income securities--high ratings
mean higher prices and less current income (yield) as compensation for risk.

     But credit ratings are subjective.  They reflect the opinions of the rating
agencies that issue them and are not absolute standards of quality. Furthermore,
high credit ratings do not guarantee good investment performance

[right margin]

INVESTMENT TEAM LEADERS

PORTFOLIO MANAGERS
     JOHN WALSH
     DENISE TABACCO

CREDIT RESEARCH MANAGER
     GREG AFIESH


                                                 www.americancentury.com      21


Glossary
- --------------------------------------------------------------------------------

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 17-18.

YIELDS

* 7-DAY  CURRENT  YIELD  is  calculated  based  on the  income  generated  by an
investment  in the fund over a seven-day  period and is  expressed  as an annual
percentage rate.

* 7-DAY  EFFECTIVE  YIELD is  calculated  similarly,  although  this  figure  is
slightly  higher than the fund's 7-Day  Current  Yield because of the effects of
compounding.  The 7-Day  Effective  Yield  assumes  that income  earned from the
fund's investments is reinvested and generating additional income.

PORTFOLIO STATISTICS

* NUMBER OF ISSUERS--the  number of entities that issued  securities held by the
fund on a given date.

*  WEIGHTED  AVERAGE   MATURITY   (WAM)--a  measure  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.  The
longer the WAM, the more interest rate  exposure and  sensitivity  the portfolio
has.

* EXPENSE RATIO--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF MONEY MARKET SECURITIES

* ASSET-BACKED SECURITIES--debt securities that represent ownership in a pool of
receivables, such as credit card debt, auto loans, or mortgages.

*  CERTIFICATES  OF DEPOSIT  (CDS)--CDs  represent a bank's  obligation to repay
money deposited with it for a specified  period of time.  Different types of CDs
have different issuers.  For example,  Yankee CDs are issued by U.S. branches of
foreign banks,  and  Eurodollar CDs are issued in London by Canadian,  European,
and Japanese banks.

* COMMERCIAL PAPER  (CP)--short-term  debt issued by large corporations to raise
cash and to cover  current  expenses in  anticipation  of future  revenues.  The
maximum  maturity  for CP is 270 days,  although  most CP is issued in a one- to
50-day  maturity  range.  CP rates  generally track those of other widely traded
money market  instruments,  such as Treasury bills and  certificates of deposit,
but they are also influenced by the maturity date and the size and credit rating
of the issuer.

* VARIABLE-RATE NOTES (VRNS)--debt securities whose interest rates change when a
designated base rate changes. The base rate is often the federal funds rate, the
90-day Treasury bill rate, or the London  Interbank  Offered Rate (LIBOR).  VRNs
are considered derivatives because they "derive" their


22      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

interest rates from their designated base rates.  However,  VRNs are not "risky"
derivatives--their  behavior is similar to that of their  designated base rates.
The  SEC has  recognized  this  similarity  and  does  not  consider  VRNs to be
inappropriate investments for money market funds.

* U.S. GOVERNMENT AGENCY  SECURITIES--debt  securities issued by U.S. government
agencies  (such as the Federal Farm Credit Bank and the Federal Home Loan Bank).
Some  agency  securities  are  backed by the full  faith and  credit of the U.S.
government,  while  most  are  guaranteed  only  by the  issuing  agency.  These
securities  are issued with  maturities  ranging  from three months to 30 years.
Money  market  funds  invest  in  these  securities  when  they  have  remaining
maturities of 13 months or less.

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

* CAPITAL  PRESERVATION--Offers  taxable and  tax-free  money  market  funds for
relative  stability of  principal  and  liquidity,  allowing  maximum  portfolio
diversification.

* INCOME--Offers  funds that can provide current income and competitive  yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

*  GROWTH  &  INCOME--Offers  funds  that  emphasize  both  growth  and  income,
diversification,  varying  capitalization sizes, and different investment styles
and strategies.

*  GROWTH--Offers  funds  with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that the fund's category may change over time. Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

* CONSERVATIVE--these funds generally provide lower return potential with either
low or minimal price fluctuation risk.

* MODERATE--  these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE--  these  funds  generally  provide  high  return  potential  with
corresponding high price fluctuation risk.


                                                 www.americancentury.com      23


Notes
- --------------------------------------------------------------------------------


24      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.sm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources



The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[back cover]

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

P.O. BOX 419200
KANSAS CITY, MISSOURI 64141-6200

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113 OR 816-444-3485

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY INVESTMENT TRUST

INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI

THIS REPORT AND THE STATEMENTS IT CONTAINS ARE SUBMITTED FOR THE GENERAL
INFORMATION OF OUR SHAREHOLDERS. THE REPORT IS NOT AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED BY AN EFFECTIVE
PROSPECTUS.

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

American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9904                                                    Funds Distributor, Inc.
SH-BKT-15981                      (c)1999 American Century Services Corporation


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