AMERICAN CENTURY INVESTMENT TRUST
N-30D, 1998-04-24
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                                     ANNUAL
                                     REPORT

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

                                FEBRUARY 28, 1998

                                     BENHAM
                                      GROUP

                               Prime Money Market

                                TABLE OF CONTENTS

Report Highlights .........................................................    1
Our Message to You ........................................................    2
Services Update ...........................................................    3
Performance & Portfolio Information .......................................    4
Management Q & A ..........................................................    5
Schedule of Investments ...................................................    7
Statement of Assets and Liabilities .......................................   10
Statement of Operations ...................................................   11
Statements of Changes in Net Assets .......................................   12
Notes to Financial Statements .............................................   13
Financial Highlights ......................................................   15
Report of Independent Accountants .........................................   16
Retirement Account Information ............................................   17
Background Information
           Investment Philosophy & Policies ...............................   20
           Comparative Indices ............................................   20
           Lipper Rankings ................................................   20
           Investment Team Leaders ........................................   20
Glossary ..................................................................   21

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


                  AMERICAN CENTURY INVESTMENTS--FAMILY OF FUNDS
- -------------------------------------------------------------------------------
        Benham                American Century       Twentieth Century(reg. tm)
     Group(reg. tm)                 Group                      Group
- -------------------------------------------------------------------------------
   MONEY MARKET FUNDS         ASSET ALLOCATION &           GROWTH FUNDS
 GOVERNMENT BOND FUNDS          BALANCED FUNDS          INTERNATIONAL FUNDS
 DIVERSIFIED BOND FUNDS   CONSERVATIVE EQUITY FUNDS
  MUNICIPAL BOND FUNDS         SPECIALTY FUNDS
- -------------------------------------------------------------------------------
        Prime
     Money Market

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

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


                                                 AMERICAN CENTURY INVESTMENTS


                               REPORT HIGHLIGHTS

*   According to Lipper Analytical  Services,  the fund outperformed the average
    money market fund during the 12 months ended February 28, 1998.

*   We left  the  fund's  portfolio  in a  neutral  position  (weighted  average
    maturity  around  55  days)  for  most of the  period.  This  reflected  the
    prevailing uncertainty about the future direction of interest rates.

*   The financial  crisis in Southeast Asia had a minimal impact on the fund. We
    significantly  reduced the fund's remaining  Japanese  holdings and replaced
    them with higher-quality U.S. securities.

*   To help maintain the fund's  above-average yield, we continued to search for
    attractively valued  variable-rate notes (VRNs),  whose yields are typically
    higher than fixed-rate  securities.  VRNs are debt securities whose interest
    rates change when a designated base rate changes.

*   We believe  interest  rates should  remain stable in the near term. We don't
    think the Federal  Reserve will change  interest  rates while U.S.  economic
    strength and Asian economic weakness continue to offset each other.

*   As long as interest  rates  remain  stable,  we plan to maintain  the fund's
    weighted average maturity at around 55-60 days. In addition, we'll diversify
    away from financial  services and bank holdings by looking for  attractively
    priced commercial paper backed by U.S. industrial companies.

*   The fund's fee  waiver--which  caps  expenses at 0.50% of average  daily net
    assets--expires  on May 31, 1998, and the fee will rise 0.10% to 0.60%.  The
    slightly higher fee could cause a small decline in the fund's yield.

*   Note:  We have  added a new  "Services  Update"  section  to your  report to
    provide  answers to frequently  asked  questions about our money market fund
    services.

              PRIME MONEY MARKET

TOTAL RETURNS:              AS OF 2/28/98
       6 Months                    2.62%*
       1 Year                       5.29%

7-DAY CURRENT YIELD:                5.17%

NET ASSETS:                  $1.4 billion
       (AS OF 2/28/98)

INCEPTION DATE:                  11/17/93

TICKER SYMBOL:                      BPRXX

* Not annualized.

Many of the investment  terms in this report are defined in the Glossary on page
21.


ANNUAL REPORT                                     REPORT HIGHLIGHTS       1


                              OUR MESSAGE TO YOU

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

    This has been an eventful  year for the  financial  markets and for American
Century.  The Benham Prime Money Market Fund performed well during the 12 months
ended  February 28,  1998,  providing  very  competitive  money market  returns.
Short-term  interest  rates  remained  relatively  stable  despite a robust U.S.
economy.

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

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

    We would  also like to let you know  what  we're  doing  about the year 2000
issue, which refers to the possible inability of computer systems to distinguish
between the years 1900 and 2000. Like other financial  companies,  a significant
percentage of our computer  operations  involves some type of date comparison or
date calculation. Although much of our system is already year 2000 compliant, we
are  aggressively  addressing the problem,  and anticipate the project should be
completed by the end of November, 1998.

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

    Thank you for your investment.

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      President and Chief Executive Officer


2      OUR MESSAGE TO YOU                     AMERICAN CENTURY INVESTMENTS


                                SERVICES UPDATE

    We get many questions from money market  investors about our services.  Here
are answers to several frequently asked questions.

IS THERE A FEE FOR WRITING CHECKS AGAINST MY MONEY MARKET FUND?

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

BESIDES WRITING A CHECK, HOW ELSE CAN I ACCESS MY MONEY?

    There are a couple of easy ways.  First, we can send a check directly to you
at your  address of  record.  All you need to do is give us a call or write us a
letter requesting the check, and we'll send it right out to you.

    We can also make automatic deposits from your money market fund to your bank
account.  Just make sure we have all of your bank  information on file, and then
give us a call to request a direct transfer to your bank account.

IS THERE A LIMIT TO THE NUMBER OF  EXCHANGES  I CAN MAKE OUT OF MY MONEY  MARKET
FUND?

    No.  Exchanges  involve  moving  money  from one  American  Century  fund to
another.  Although  there is a limit of six  exchanges out of our bond and stock
funds, this limit does not apply to money market funds.

    Exchanges  can be made  by  calling  an  Investor  Services  representative,
dialing into our Automated  Information Line, writing us a letter, or connecting
to our Web site. You can also make exchanges through our Automatic Exchange plan
or Open Order service.

HOW DO OPEN ORDERS WORK?

    Open Orders enable you to buy or sell shares in a mutual fund  automatically
at a price you designate. Here's how it works:

*   TO  BUY--select  a fund in which you wish to invest  and  specify a price at
    which you'd like to buy shares.  Because the object is to buy low, the price
    you specify must be at or below the fund's last closing price. If the fund's
    price closes at or below your specified  price, we will  automatically  move
    the amount you designated from your money market fund into an account in the
    fund you selected.

*   TO  SELL--select a fund in which you own shares and specify a price at which
    you'd like to sell them.  Because the object is to sell high,  the price you
    specify  must be at or above the fund's last  closing  price (we can't place
    stop-loss  orders  for you).  If the  fund's  price  closes at or above your
    specified price, we'll sell the number of shares you designated and move the
    proceeds into your money market fund.

SOME OTHER NOTES ABOUT OPEN ORDERS:

*   Open  Orders  last for a maximum of 90 days and may be  canceled or extended
    whenever you choose.

*   Once you've  placed,  canceled,  or modified  your Open Order,  we'll send a
    letter confirming your decision to your address of record.

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


ANNUAL REPORT                                       SERVICES UPDATE       3


<TABLE>
<CAPTION>
                      PERFORMANCE & PORTFOLIO INFORMATION

                                                                             AVERAGE ANNUAL RETURNS
                                           6 MONTHS          1 YEAR           3 YEARS      LIFE OF
FUND(2)
- -------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF FEBRUARY 28, 1998(1)

<S>                                          <C>              <C>              <C>           <C>  
Prime Money Market ........................  2.62%            5.29%            5.31%         5.09%

90-Day Treasury Bill Index ................  2.13%            4.75%            5.12%         4.92%(3)

Average Money Market Instrument Fund(4) ...  2.43%            4.93%            5.03%         4.69%(3)

Fund's Ranking Among Money Market
Instrument Funds(4) .......................   --          43 out of 306    40 out of 245    10 out of 207
- ----------

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

(2) Inception date was November 17, 1993.

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

(4) According to Lipper Analytical Services.
</TABLE>

See pages 20-21 for more information  about returns,  the comparative  index and
Lipper fund rankings.

YIELDS AS OF FEBRUARY 28, 1998

                              7-DAY            7-DAY
                             CURRENT         EFFECTIVE
                              YIELD            YIELD

Prime Money Market            5.17%            5.30%

Yields are defined in the Glossary on page 21.


PORTFOLIO AT A GLANCE
                              2/28/98        2/28/97

Number of Issuers               58             49
Weighted Average Maturity     65 days        54 days
Expense Ratio                  0.50%          0.50%

Money market funds are neither insured nor guaranteed by the U.S. government.

Yields will fluctuate,  and there can be no assurance that the fund will be able
to maintain a stable $1.00 share price.


4      PERFORMANCE & PORTFOLIO INFORMATION    AMERICAN CENTURY INVESTMENTS


                                MANAGEMENT Q&A

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

HOW DID THE FUND PERFORM DURING THE YEAR ENDED FEBRUARY 28, 1998?

    The fund performed well, providing a higher level of income than the average
money  market  fund.  For the  12-month  period,  the fund had a total return of
5.29%,  compared  with  the  4.93%  average  return  of the  306  "Money  Market
Instrument Funds" tracked by Lipper Analytical Services.  (See the Total Returns
table on the previous page for other fund performance comparisons).

HOW WAS THE FUND POSITIONED DURING THE PERIOD?

    We  consider  a  weighted  average  maturity  of 50-60  days to be a neutral
position  for the fund,  the  target we use when we're  unsure  about the future
direction  of  interest  rate  movements.  We  moved  the fund  from a  slightly
defensive  position in the first several  months of the period to a more neutral
stance for the  remainder of the year.  After  beginning the fiscal year with an
average maturity of around 45 days, we shortened to a more defensive  posture of
between 30-40 days in May when we were concerned that the Federal  Reserve would
raise  interest  rates to reduce  inflationary  pressures.  If the Fed did raise
rates,  we wanted to improve our ability to translate  those higher rates into a
higher yield for the fund.

    Over the next couple of months,  however,  the inflation threat subsided and
the Fed held interest rates steady.  As a result, we extended the fund's average
maturity  to 60 days in July.  Given an  uncertain  outlook for  interest  rates
stemming  from the  countervailing  forces of an economic  slowdown in Southeast
Asia and a strong U.S. economy, we maintained a 55-60-day average maturity until
late November.  The average maturity dipped in December,  reflecting a temporary
scarcity of  attractively  priced,  longer-maturity  paper.  When supply bounced
back,  we extended the average  maturity back out to about 55-60 days at the end
of 1997, where it remained until the end of the period.

DID THE FINANCIAL PROBLEMS IN SOUTHEAST ASIA HAVE ANY IMPACT ON THE FUND?

    No. Our credit group  spotted the Japanese  banking  sector's  deterioration
quite  some time ago.  As a result,  Prime's  Japanese  holdings  were small and
limited to securities of strong Japanese industrial  companies,  such as Toyota.
As the problems in  Southeast  Asia  intensified,  our  conservative  investment
approach led us to further reduce our Japanese industrial  holdings.  Our credit
team of 10 analysts  continues to closely  monitor  events in Southeast Asia and
Japan to anticipate the impact of continued  Asian weakness on other sectors and
economies.  To offset the  reduction in Japanese  industrial  holdings,  we have
added high-quality  asset-backed  commercial paper (short-term securities backed
by a pool of loans or other debt). These holdings provide  above-average returns
with  low  credit  risk  characteristics  due  to  the  over-collateralized  and
credit-enhanced nature of these issues.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 2/28/98)
Commercial Paper          70%
Variable-Rate Notes       17%
Asset-Backed Securities    7%
CDs                        4%
Other                      2%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 8/31/97)
Commercial Paper          71%
Variable-Rate Notes       18%
U.S. Government
Agency Securities          7%
CDs                        3%
Asset-Backed Securities    1%


ANNUAL REPORT                                      MANAGEMENT Q & A       5


                                MANAGEMENT Q&A

IN THE PAST YOU DISCUSSED ADDING  ASSET-BACKED  SECURITIES TO ENHANCE THE FUND'S
YIELD.   WHAT  OTHER  STRATEGIES  HAVE  YOU  EMPLOYED  TO  MAINTAIN  THE  FUND'S
ABOVE-AVERAGE YIELD?

    We continued to search for attractively  valued  variable-rate notes (VRNs).
VRNs are debt securities whose interest rates change when a designated base rate
changes.  Their yields are typically  higher than  fixed-rate  securities.  When
choosing  VRNs, a primary factor we consider is how the market  anticipates  Fed
actions and how that affects short-term  interest rates. For example,  some VRNs
are tied to the London Interbank Offered Rate (LIBOR),  a money market rate that
most banks and  corporations  track when  determining  the rate  they'll  pay to
investors on short-term  debt.  Others are tied to the federal  funds rate,  the
lending rate targeted by the Fed for large  overnight  loans between  commercial
banks.  The yields on  LIBOR-related  securities tend to anticipate Fed actions,
rising before  interest rate hikes and falling in advance of rate cuts.  When we
believe  the  Fed is  poised  to  raise  interest  rates,  we  typically  choose
securities  tied to LIBOR to  capture  the higher  yields as early as  possible.
Conversely, when we think that the Fed is poised to reduce rates, we lean toward
VRNs tied to the federal funds rate because their yields  typically  stay higher
longer than the yields of LIBOR-related securities.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES OVER THE  NEXT SIX MONTHS?

    We believe  rates should  remain  stable over the near term,  though  market
sentiment  is  currently  divided.  On  one  hand,  the  strength  of  the  U.S.
economy--as  evidenced  by very low  unemployment,  strong  retail sales and low
inventories--has the potential to re-ignite inflationary pressures and force the
Fed to raise rates. On the other hand, we don't know if the economic slowdown in
Southeast Asia has had its full impact on the U.S. economy.  If problems in Asia
translate into slower U.S. economic growth, the Fed could cut rates.

GIVEN THAT OUTLOOK, HOW WILL YOU MANAGE THE FUND OVER THE NEXT SIX MONTHS?

    We plan to  maintain  the fund's  average  maturity  at around 60 days until
there is  definitive  and sustained  evidence of the direction of U.S.  economic
growth, inflation and interest rates. Additionally,  we'll look for attractively
priced  commercial paper backed by U.S.  industrial  companies to diversify away
from financial services and bank holdings.

     Another  factor that could have a slight impact on future  performance is a
scheduled  change in the  fund's  management  fee.  As we've  mentioned  in past
reports,  Prime has benefited from a fee waiver that capped expenses at 0.50% of
average daily net assets.  This fee waiver  expires on May 31, 1998, and the fee
will rise 0.10% to 0.60%. The slightly higher fee could cause a small decline in
the fund's yield. We anticipate no further fee increases in the near future.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 2/28/98)
A-1+                      72%
A-1                       28%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 8/31/97)
A-1+                      80%
A-1                       16%
A-2                        2%
Unrated U.S. Government
Agency Securities          2%

Credit ratings given by Standard & Poor's.


6      MANAGEMENT Q & A                       AMERICAN CENTURY INVESTMENTS


                            SCHEDULE OF INVESTMENTS

FEBRUARY 28, 1998


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

COMMERCIAL PAPER(1)

BANKING--17.4%

               $32,000,000  Abbey National North America
                                Corp., 5.43%-5.50%,
                                3/31/98-4/21/98                 $     31,816,109

                20,500,000  Bank of Nova Scotia,
                                5.43%-5.45%, 4/8/98-4/9/98            20,380,836

                15,000,000  Bankers Trust New York Corp.,
                                5.37%, 7/15/98                        14,695,700

                20,000,000  Banque Nationale de Paris
                                (Canada), 5.48%-5.73%,
                                3/9/98-4/13/98                        19,921,811

                39,000,000  BIL North America, Inc.,
                                5.45%-5.46%,
                                3/25/98-5/13/98                       38,754,164

                10,000,000  Cofco Capital Corp., 5.75%,
                                3/5/98 (LOC: Credit Suisse
                                First Boston)                          9,993,611

                 7,000,000  Galicia Funding Corp., Series B, 
                                5.78%,  3/4/98 (LOC:
                                Bayerische Vereinsbank A.G.)           6,996,628

                50,000,000  Garanti Funding Corporation,
                                5.40%-5.58%,
                                3/4/98-7/27/98
                                (LOC: Bayerische
                                Vereinsbank A.G.)                     49,477,953

                12,850,000  IMI Funding Corp. (U.S.A.),
                                5.75%, 3/2/98-3/18/98                 12,833,381

                12,000,000  National Australia Funding
                                (Delaware), Inc., 5.43%,
                                4/21/98                               11,907,690

                 8,000,000  Pemex Capital, Inc., 5.58%,
                                4/22/98 (LOC: Societe
                                Generale)                              7,935,520

                20,000,000  Westdeutsche Landesbank
                                Girozentrale, 5.47%, 4/2/98           19,902,756
                                                               -----------------

                                                                     244,616,159
                                                               -----------------

CREDIT CARD & TRADE RECEIVABLES--10.8%

                 1,000,000  Charta Corporation, 5.50%,
                                3/19/98 (AMBAC) (Acquired
                                2/13/98, Cost $994,806)(2)               997,250


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

               $57,290,000  Corporate Receivables Corp.,
                                5.45%-5.53%,
                                3/5/98-5/21/98
                                (LOC: Citibank, N.A.)
                                (Acquired 1/6/98 through
                                2/18/98, Cost $56,664,617)(2)   $     56,916,385

                60,200,000  Dakota Certificates (Citibank), 
                                Series 1995-7, 5.46%-5.75%,  
                                3/3/98-5/18/98  (Acquired 
                                12/22/97 through 2/18/98,
                                Cost $59,470,173)(2)                  59,876,826

                35,000,000  WCP Funding Inc., 5.43%-5.47%,  
                                4/7/98-4/24/98 (AMBAC) 
                                (Acquired 1/15/98 through
                                1/29/98, Cost $34,565,410)(2)         34,778,429
                                                               -----------------

                                                                     152,568,890
                                                               -----------------

COMMUNICATIONS SERVICES--0.4%

                 5,000,000  Ameritech Capital Funding Corp.,
                                5.43%, 4/10/98                         4,969,834
                                                               -----------------

DIVERSIFIED COMPANIES--3.1%

                44,000,000  Mitsubishi International Corp.,
                                5.50%-5.65%,
                                4/20/98-5/20/98                       43,539,167
                                                               -----------------

FINANCIAL SERVICES--14.6%

                47,000,000  Ford Motor Credit Co. Puerto Rico,
                                Inc., 5.45%-5.53%,
                                4/9/98-5/15/98                        46,635,558

                39,500,000  General Electric Capital Corp.,
                                5.37%-5.68%, 3/2/98-6/5/98            39,232,257

                24,000,000  General Electric Capital Services,
                                Inc., 5.47%, 4/3/98-4/14/98           23,856,260

                45,000,000  General Electric Financial
                                Assurance Holdings,
                                5.47%-5.49%,
                                3/6/98-3/13/98                        44,933,863

                24,100,000  General Motors Acceptance Corp.,
                                5.46%-5.75%,
                                3/10/98-4/20/98                       23,944,485

                27,000,000  Toyota Motor Credit Corp.,
                                5.73%-5.77%,
                                3/3/98-3/27/98                        26,953,168
                                                               -----------------

                                                                     205,555,591
                                                               -----------------

HOUSEHOLD AUDIO & VIDEO--0.9%

                12,313,000  Panasonic Finance America, 5.54%,
                                3/6/98 (Acquired 10/9/97,
                                Cost $12,032,565)(2)                  12,303,525
                                                               -----------------

See Notes to Financial Statements


ANNUAL REPORT                               SCHEDULE OF INVESTMENTS       7


                            SCHEDULE OF INVESTMENTS

FEBRUARY 28, 1998


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

INSURANCE--2.7%

              $  9,400,000  American Family Financial Services,
                                Inc., 5.47%, 3/5/98                    9,394,287

                 8,500,000  Prudential Funding Corp., 5.47%,
                                4/14/98                                8,443,173

                20,000,000  SAFECO Corporation,
                                5.47%-5.76%,
                                3/12/98-4/15/98
                                (Acquired 12/15/97-1/15/98,
                                Cost $19,725,650)(2)                  19,914,025
                                                                 ---------------

                                                                      37,751,485
                                                                 ---------------

METALS & MINING--0.6%

                 9,000,000  RTZ America Inc., 5.53%,
                                3/20/98 (Acquired 9/19/97,
                                Cost $8,748,385)(2)                    8,973,733
                                                                 ---------------

PETROLEUM REFINING--4.2%

                18,900,000  Chevron Transport Corp.,
                                5.44%-5.50%,
                                3/18/98-6/16/98                       18,715,196

                40,000,000  Chevron U.K. Investment PLC,
                                5.43%-5.75%,
                                3/10/98-4/6/98                        39,861,109
                                                                 ---------------

                                                                      58,576,305
                                                                 ---------------

RETAIL--0.7%

                10,133,000  Southland Corp., 5.45%, 4/21/98           10,054,765
                                                                 ---------------

RUBBER & PLASTICS--1.0%

                15,000,000  Formosa Plastics Corp. USA,
                                5.50%, 6/4/98 (LOC: Bank of
                                America N.T. & S.A.)                  14,782,292
                                                                 ---------------

SECURITY BROKERS & DEALERS--12.8%

                10,000,000  Bear Stearns Co., Inc., 5.46%,
                                5/13/98                                9,889,283

                40,000,000  Credit Suisse First Boston, Inc.,
                                5.41%-5.46%,
                                4/22/98-5/19/98                       39,623,977

                37,000,000  Goldman Sachs Group L.P.,
                                5.43%-5.70%,
                                5/4/98-5/11/98                        36,604,707

                45,000,000  Merrill Lynch & Co., Inc.,
                                5.46%-5.73%,
                                3/9/98-7/31/98                        44,436,373


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

               $51,000,000  Morgan Stanley Dean Witter,
                                Discover & Co., 5.40%-5.49%,
                                4/17/98-7/29/98                  $    50,332,075
                                                                 ---------------

                                                                     180,886,415
                                                                 ---------------

UTILITIES--0.7%

                10,000,000  National Rural Utilities, 5.45%,
                                4/15/98                                9,931,875
                                                                 ---------------

TOTAL COMMERCIAL PAPER--69.9%                                        984,510,036
                                                                 ---------------

OTHER CORPORATE DEBT

                25,000,000  Abbey National Treasury Services,  
                                VRN, 5.51%, 3/16/98, resets 
                                monthly off the 1-month LIBOR
                                minus 0.12% with no caps              24,995,296

                20,000,000  American Express Centurion Bank,  
                                VRN, 5.57%, 3/11/98, resets 
                                monthly off the 1-month LIBOR
                                minus 0.06% with no caps              20,000,000

                15,000,000  American Express Centurion Bank,  
                                VRN, 5.60%, 3/12/98, resets 
                                monthly off the 1-month LIBOR
                                minus 0.03% with no caps              15,000,546

                50,000,000  General American Life, 
                                VRN, 5.82%, 3/1/98, resets  
                                monthly off the 1-month LIBOR 
                                plus 0.20% with no caps (Acquired
                                1/3/97, Cost $50,000,000)(2)          50,000,000

                25,000,000  General Electric Capital Corp., VRN,
                                5.54%, 4/21/98, resets quarterly
                                off the 3-month LIBOR minus
                                0.09% with no caps                    25,000,000

                15,000,000  Key Bank N.A., VRN, 5.68%, 
                                3/1/98,  resets daily off the 
                                Federal Funds rate plus 0.07%
                                with no caps                          14,996,126

                47,000,000  Transamerica Occidental Life Insurance Co., 
                                VRN, 5.625%, 3/2/98, resets 
                                monthly off the 1-month LIBOR with 
                                no caps (Acquired 6/30/97, Cost
                                $47,000,000)(2)                       47,000,000

                11,700,000  Travelers Insurance Company (The), 
                                VRN, 5.68%, 3/9/98, resets monthly 
                                off the 1-month LIBOR plus 0.05% 
                                with no caps (Acquired 6/9/97, Cost
                                $11,700,000)(2)                       11,700,000

See Notes to Financial Statements


8      SCHEDULE OF INVESTMENTS                AMERICAN CENTURY INVESTMENTS


                            SCHEDULE OF INVESTMENTS

FEBRUARY 28, 1998


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

               $23,500,000  Travelers Insurance Company (The), 
                                VRN, 5.68%, 3/23/98, resets  
                                monthly off the 1-month LIBOR
                                plus 0.05% with no caps 
                                (Acquired 5/23/97, Cost
                                $23,500,000)(2)                  $    23,500,000
                                                                 ---------------

TOTAL OTHER CORPORATE DEBT--16.5%                                    232,191,968
                                                                 ---------------

ASSET-BACKED SECURITIES

                23,500,000  ABSIT, VRN, Series 1997 C, Class N,  
                                5.625%, 3/16/98, resets monthly 
                                off the 1-month  LIBOR
                                with no caps 
                                (LOC: Goldman Sachs Group L.P.)
                                (Acquired 6/11/97,
                                Cost $23,500,000)(2)                  23,500,000

                 5,903,334  Americredit Automobile Receivables 
                                Trust, Series 1997 C, Class A1, 
                                5.66%, 9/5/98 (FSA)                    5,903,334

                 7,349,378  Americredit Automobile Receivables 
                                Trust, Series 1997 D, Class A1, 
                                5.80%, 11/5/98 (FSA)                   7,349,378

                 3,251,427  Barnett Auto Trust, Series 1997 A, 
                                Class A1, 5.65%, 10/15/98 
                                (Acquired 9/18/97, Cost
                                $3,251,427)(2)                         3,251,427

                10,315,769  Capita Equipment Receivables
                                Trust, Series 1997-1, Class A1,
                                5.79%, 12/15/98                       10,315,769

                11,000,000  Chase Manhattan Auto Owner Trust, 
                                Series 1998 A,
                                Class A1, 5.55%, 3/12/99              11,000,000

                 5,245,042  Ford Credit Auto Owner Trust, 
                                Series 1997 B,
                                Class A1, 5.75%, 10/15/98              5,245,042

                20,000,000  Ford Credit Auto Owner Trust,  
                                Series 1998 A,
                                Class A1, 5.55%, 2/15/99              20,000,000

                14,000,000  Racers Series 1997-MM-8-5, VRN,
                                5.61%, 3/30/98, resets monthly
                                off the 1-month LIBOR minus
                                0.02% with no caps (LOC:
                                National Westminster Bank PLC)
                                (Acquired 8/29/97, Cost
                                $14,000,000)(2)                       14,000,000
                                                                 ---------------

TOTAL ASSET-BACKED SECURITIES--7.1%                                  100,564,950
                                                                 ---------------

CERTIFICATES OF DEPOSIT

               $10,000,000  Chase Manhattan Corp., 5.56%,
                                7/7/98                           $    10,000,000

                20,000,000  Bayerische Landesbank
                                Girozentrale, 5.66%, 2/22/99          20,000,000

                13,000,000  Rabobank Nederland,
                                5.43%-5.99%,
                                3/24/98-1/12/99                       12,980,541

                14,000,000  Royal Bank of Canada - New York,
                                5.55%, 2/11/99                        13,992,167
                                                                 ---------------

TOTAL CERTIFICATES OF DEPOSIT--4.0%                                   56,972,708
                                                                 ---------------

BANK NOTES--2.5%

                35,000,000  BankBoston Corp., 5.59%-5.83%,
                                4/9/98-7/8/98                         35,000,000
                                                                 ---------------

TOTAL INVESTMENT SECURITIES--100.0%                               $1,409,239,662
                                                                 ---------------


NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

FSA = Financial Security Assurance Inc.

LIBOR = London Interbank Offered Rate

LOC = Letter of Credit

VRN  =  Variable  Rate  Note.  Interest  reset  date is  indicated  and  used in
     calculating  the  weighted  average  portfolio  maturity.   Rate  shown  is
     effective February 28, 1998.

resets = The frequency  with which a  fixed-income  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.

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

(2)  Security was  purchased  under Rule 144A or Section 4(2) of the  Securities
     Act  of  1933  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,  1998,  was
     $366,711,600,  which represented 25.9% of net assets. Restricted securities
     which were illiquid represented 5.1% of net assets.

See Notes to Financial Statements


ANNUAL REPORT                               SCHEDULE OF INVESTMENTS       9


                      STATEMENT OF ASSETS AND LIABILITIES

FEBRUARY 28, 1998

ASSETS

Investment securities, at value (amortized cost and
  cost for federal income tax purposes) (Note 1) ............... $1,409,239,662

Cash ...........................................................     12,464,116

Interest receivable ............................................      1,906,726
                                                                 ---------------
                                                                  1,423,610,504
                                                                 ---------------
LIABILITIES

Disbursements in excess of demand deposit cash .................      4,193,481

Payable for capital shares redeemed ............................      1,365,778

Accrued management fees (Note 2) ...............................        543,835

Dividends payable ..............................................        195,084

Accrued expenses and other liabilities .........................          1,639
                                                                 ---------------
                                                                      6,299,817
                                                                 ---------------
Net Assets ..................................................... $1,417,310,687
                                                                 ===============
CAPITAL SHARES

Outstanding (Unlimited number of shares authorized)
                                                                  1,417,565,184
                                                                 ===============
Net Asset Value Per Share ......................................          $1.00
                                                                 ===============
NET ASSETS CONSIST OF:

Capital paid in
                                                                 $1,417,565,184

Accumulated undistributed net realized loss on
  investment transactions ......................................      (254,497)
                                                                 ---------------
                                                                 $1,417,310,687
                                                                 ===============

See Notes to Financial Statements


10     STATEMENT OF ASSETS AND LIABILITIES     AMERICAN CENTURY INVESTMENTS


                            STATEMENT OF OPERATIONS

YEAR ENDED FEBRUARY 28, 1998

INVESTMENT INCOME

Income:

Interest .......................................................     $73,727,79
                                                                 ---------------

Expenses (Note 2):

Investment advisory fees .......................................      6,282,235

Transfer agency fees ...........................................        765,989

Administrative fees ............................................        476,721

Printing and postage ...........................................        255,358

Custodian fees .................................................         92,513

Trustees' fees and expenses ....................................         66,163

Telephone expenses .............................................         58,663

Registration and filing fees ...................................         52,224

Auditing and legal fees ........................................         23,907

Other operating expenses .......................................         20,676
                                                                 ---------------
  Total expenses ...............................................      8,094,449

Amount waived ..................................................     (1,590,729)
                                                                 ---------------
  Net expenses .................................................      6,503,720
                                                                 ---------------
Net investment income ..........................................     67,224,070
                                                                 ---------------
REALIZED GAIN ON INVESTMENTS

Net realized gain on investments ...............................         24,038
                                                                 ---------------

Net Increase in Net Assets
  Resulting from Operations ....................................    $67,248,108
                                                                 ===============
See Notes to Financial Statements


ANNUAL REPORT                               STATEMENT OF OPERATIONS       11


                      STATEMENTS OF CHANGES IN NET ASSETS

YEARS ENDED FEBRUARY 28, 1998 AND FEBRUARY 28, 1997


Increase (Decrease) in Net Assets                   1998              1997

OPERATIONS

Net investment income ........................  $67,224,070        $61,135,898

Net realized gain (loss) on investments ......     24,038           (278,535)
                                               --------------    ---------------
Net increase in net assets resulting
  from operations ............................   67,248,108        60,857,363
                                               --------------    ---------------
DISTRIBUTIONS TO SHAREHOLDERS

From net investment income ...................  (67,224,070)      (61,135,898)
                                               --------------    ---------------
CAPITAL SHARE TRANSACTIONS

Proceeds from shares sold .................... 2,330,994,339      1,722,837,328

Proceeds from reinvestment of distributions ..   63,902,564        58,408,826

Payments for shares redeemed .................(2,189,600,577)    (1,839,630,699)
                                               --------------    ---------------
Net increase (decrease) in net assets
  from capital share transactions ............  205,296,326       (58,384,545)
                                               --------------    ---------------
Net increase (decrease) in net assets ........  205,320,364       (58,663,080)

NET ASSETS

Beginning of year ............................ 1,211,990,323      1,270,653,403
                                               --------------    ---------------
End of year .................................. $1,417,310,687    $1,211,990,323
                                               ==============    ===============
TRANSACTIONS IN SHARES
OF THE FUND

Sold ......................................... 2,330,994,339      1,722,837,328

Issued in reinvestment of distributions ......   63,902,564        58,408,826

Redeemed ..................................... (2,189,600,577)   (1,839,630,699)
                                               --------------    ---------------
Net increase (decrease) ......................  205,296,326       (58,384,545)
                                               ==============    ===============
See Notes to Financial Statements


12      STATEMENTS OF CHANGES IN NET ASSETS    AMERICAN CENTURY INVESTMENTS


                         NOTES TO FINANCIAL STATEMENTS

FEBRUARY 28, 1998

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.  American  Century - Benham  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.  On March 9,
1998, the Board of Trustees approved the merger of the Fund and American Century
- - Benham Cash Reserve  Fund.  The  following  significant  accounting  policies,
related  to the Fund,  are in  accordance  with  accounting  policies  generally
accepted in the investment company industry.

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

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

    At February 28, 1998,  accumulated  net realized  capital loss carryovers of
$254,497 (expiring 2005) may be used to offset future taxable gains.

    USE OF ESTIMATES--The preparation of financial statements in conformity with
generally accepted  accounting  principles requires management to make estimates
and assumptions  that affect the reported  amounts of assets and liabilities and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the reported  amounts of increases  and  decreases in net assets
from  operations  during the  period.  Actual  results  could  differ from these
estimates.

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


ANNUAL REPORT                         NOTES TO FINANCIAL STATEMENTS       13


                         NOTES TO FINANCIAL STATEMENTS

FEBRUARY 28, 1998

2. TRANSACTIONS WITH RELATED PARTIES

    The  shareholders  of the Fund  approved  a new  management  agreement  with
American Century Investment Management,  Inc. (ACIM) on July 30, 1997, effective
August 1, 1997,  which replaced the previously  existing  contracts  between the
Fund and Benham Management Corporation and American Century Services Corporation
(ACSC) for advisory,  administrative and transfer agency services. Under the new
agreement,  ACIM  provides all  services  required by the Fund in exchange for a
unified  management  fee.  Expenses  excluded from this agreement are brokerage,
taxes, portfolio insurance,  interest, fees and expenses of the Trustees who are
not considered  "interested persons" as defined in the Investment Company Act of
1940 (including  counsel fees) and  extraordinary  expenses.  The annual rate at
which this fee is assessed is determined monthly in a two-step process: First, a
fee rate schedule is applied to the net assets of all of the funds in the Fund's
investment  category which are managed by ACIM (the "Investment  Category Fee").
The overall investment objective of the Fund determines its Investment Category.
The three  investment  categories are: the Money Market Fund Category,  the Bond
Fund Category and the Equity Fund Category. The Fund is in the Money Market Fund
Category.  Second,  a separate fee rate schedule is applied to the net assets of
all of the funds managed by ACIM (the "Complex  Fee").  The Investment  Category
Fee and the Complex Fee are then added to determine the unified  management  fee
rate.  The  management  fee is paid  monthly  by the Fund  based  on the  Fund's
aggregate  average daily net assets during the previous month  multiplied by the
monthly management fee rate. The annualized Investment Category Fee schedule for
the Fund is as follows:

          0.3700% of the first $1 billion 
          0.3270% of the next $1 billion 
          0.2860% of the next $3 billion 
          0.2690% of the next $5 billion 
          0.2580% of the next $15 billion 
          0.2575% of the next $25 billion
          0.2570% of the average daily net assets over $50 billion

    The annualized Complex Fee schedule is as follows:

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

    ACIM has agreed to continue to waive  expenses which exceed 0.50% of average
daily net assets  until May 31, 1998.  Total  expenses of  $4,730,735,  of which
$805,481 were waived by ACIM,  were incurred under the new management  agreement
and are included in Investment  Advisory  Fees in the  Statement of  Operations.
Total expenses under the previous agreement,  for the five months ended July 31,
1997,  were  $3,363,714,  of which  $785,248  were waived by ACIM.  The ratio of
operating expenses to average net assets, net of the amount waived, for the same
period was 0.50%.

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


14      NOTES TO FINANCIAL STATEMENTS          AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS

For a Share Outstanding Throughout the Years Ended February 28 (except as noted)

                                               1998           1997           1996(1)         1995          1994(2)

PER-SHARE DATA

Net Asset Value,
<S>                                            <C>            <C>             <C>            <C>            <C>  
Beginning of Period ........................   $1.00          $1.00           $1.00          $1.00          $1.00
                                            ----------     ----------      ----------     ----------     ----------
Income From Investment Operations

  Net Investment Income ....................   0.05           0.05            0.06           0.05           0.01
                                            ----------     ----------      ----------     ----------     ----------
Distributions

  From Net Investment Income ...............  (0.05)         (0.05)          (0.06)         (0.05)         (0.01)
                                            ----------     ----------      ----------     ----------     ----------
Net Asset Value, End of Period .............   $1.00          $1.00           $1.00          $1.00          $1.00
                                            ==========     ==========      ==========     ==========     ==========
  Total Return(3) ..........................   5.29%          5.04%           5.60%          4.93%          0.96%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets. .....................   0.50%          0.50%           0.48%          0.04%           --

Ratio of Operating Expenses to Average
Net Assets (Before Expense Waiver) .........   0.63%          0.63%           0.62%          0.71%        1.49%(4)

Ratio of Net Investment Income to
Average Net Assets .........................   5.17%          4.92%           5.43%          5.28%        3.35%(4)

Ratio of Net Investment Income to Average
Net Assets (Before Expense Waiver) .........   5.04%          4.79%           5.29%          4.61%        1.86%(4)

Net Assets, End
of Period (in thousands) ...................$1,417,311     $1,211,990      $1,270,653     $1,509,863       $75,168
- ----------

(1)  Year ended February 29, 1996.

(2)  November 17, 1993 (inception) through February 28, 1994.

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

(4)  Annualized.
</TABLE>

See Notes to Financial Statements


ANNUAL REPORT                                  FINANCIAL HIGHLIGHTS       15


                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Trustees and  Shareholders  of the American  Century - Benham Prime Money
Market Fund:


We have audited the accompanying statement of assets and liabilities,  including
the  schedule of  investments,  of American  Century - Benham Prime Money Market
Fund as of February 28, 1998, and the related statement of operations, statement
of changes in net assets, and the financial  highlights for the year then ended.
These financial  statements and financial  highlights are the  responsibility of
the Trust's  management.  Our  responsibility  is to express an opinion on these
financial  statements and financial highlights based on our audit. The statement
of changes in net assets for the year ended  February 28, 1997 and the financial
highlights  for the four 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 statements.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards  require that we plan and perform the audit to obtain reasonable
assurance  about whether the financial  statements and financial  highlights are
free of material  misstatement.  An audit includes  examining,  on a test basis,
evidence supporting the amounts and disclosures in the financial statements. Our
procedures included confirmation of securities owned as of February 28, 1998, by
correspondence  with  the  custodian.  An  audit  also  includes  assessing  the
accounting principles used and significant estimates made by management, as well
as evaluating the overall financial statement presentation.  We believe that our
audit provides a reasonable basis for our opinion.

In our opinion,  the financial  statements and financial  highlights referred to
above present fairly, in all material  respects,  the financial  position of the
American  Century - Benham Prime Money Market Fund as of February 28, 1998,  the
results of its  operations,  the  changes  in its net  assets and the  financial
highlights  for the  year  then  ended in  conformity  with  generally  accepted
accounting principles.

                                                      Coopers & Lybrand L.L.P.

Kansas City, Missouri
April 7, 1998


16      REPORT OF INDEPENDENT ACCOUNTANTS      AMERICAN CENTURY INVESTMENTS


                        RETIREMENT ACCOUNT INFORMATION

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

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

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


ANNUAL REPORT                        RETIREMENT ACCOUNT INFORMATION       17


                                     NOTES


18      NOTES                                  AMERICAN CENTURY INVESTMENTS


                                     NOTES


ANNUAL REPORT                                                 NOTES       19


                            BACKGROUND INFORMATION

INVESTMENT PHILOSOPHY & POLICIES

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

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

    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
U.S. government.  Yields will fluctuate,  and there can be no assurance that the
fund will be able to maintain a stable net asset value of $1 per share.

COMPARATIVE INDICES

    The following index is used in the report as a fund performance  comparison.
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  ANALYTICAL  SERVICES,  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.

- --------------------------------------------------------------------------------
INVESTMENT TEAM LEADERS
- --------------------------------------------------------------------------------
  Portfolio Managers                John Walsh, Denise Tabacco
  Credit Research Director          Greg Afiesh
- --------------------------------------------------------------------------------

20      BACKGROUND INFORMATION                 AMERICAN CENTURY INVESTMENTS


                                   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 page 15.

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 which issued securities and are held
by a 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  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.


ANNUAL REPORT                                              GLOSSARY       21


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