N14
                                Initial Statement

     As filed with the Securities and Exchange Commission on April 17, 1998

                                Registration Nos.

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

                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                    FORM N-14

                  REGISTRATION UNDER THE SECURITIES ACT OF 1933

                      Pre-Effective Amendment No. _____ [ ]
                      Post-Effective Amendment No. ____ [ ]

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

                        AMERICAN CENTURY INVESTMENT TRUST
               (Exact Name of Registrant as Specified in Charter)

                                4500 Main Street,
                                 P.O. Box 419200
                           Kansas City, MO 64141-6200
                    (Address of Principal Executive Offices)

        Registrant's Telephone Number, including Area Code: 816-531-5575

                             Charles A. Etherington
                  Vice President and Assistant General Counsel
          4500 Main Street, P.O. Box 419200, Kansas City, MO 64141-6200
                     (Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering:  As soon as practicable after this
Registration Statement becomes effective under the Securities Act of 1933.

Calculation of Registration  Fee under the Securities Act of 1933: No filing fee
is  required  because  an  indefinite  number of  shares  have  previously  been
registered on Form N-1A (Registration Nos. 33-65170,  811-8532) pursuant to Rule
24f-2 under the  Investment  Company Act of 1940. The Registrant is filing as an
exhibit to this  Registration  Statement  an opinion  related to the legality of
shares being issued in connection with this Registration Statement.  Pursuant to
Rule 429, this  Registration  Statement  relates to the  aforesaid  Registration
Statement on Form N-1A.

The Registrant hereby amends this  Registration  Statement on such date or dates
as may be necessary to delay its effective date until the Registrant  shall file
a further amendment which specifically  states that this Registration  Statement
shall  thereafter  become  effective  in  accordance  with  section  8(a) of the
Securities  Act of  1933  or  until  the  Registration  Statement  shall  become
effective on such date as the Commission  acting  pursuant to said section 8(a),
may determine.



                        AMERICAN CENTURY INVESTMENT TRUST
                                    FORM N-14
                              CROSS REFERENCE SHEET
                             PURSUANT TO RULE 481(a)
                                                       
         Part A Item No.                                      Prospectus/Proxy
         and Caption                                          Statement Caption

1.       Beginning of Registration Statement and              Cover Page
         Outside Front Cover Page of Prospectus

2.       Beginning and Outside Back Cover Page of             Table of Contents
         Prospectus

3.       Fee Table, Synopsis Information and Risk             Important Information You Should
         Factors                                              Consider; Comparison of Certain
                                                              Information Regarding the Funds; Risk Factors; Transaction and
                                                              Operating Expense Information; Information About the Funds

4.       Information About the Transaction                    Important Information You Should
                                                              Consider; Risk Factors; Additional
                                                              Information Relating to the Proposed
                                                              Transaction; Information About the Funds


5.       Information About the Registrant                     Important Information You Should
                                                              Consider; Comparison of Certain
                                                              Information Regarding the Funds; Risk
                                                              Factors; Information About the Funds;
                                                              Additional Information

6.       Information About the Company Being Acquired         Important Information You Should
                                                              Consider; Comparison of Certain
                                                              Information Regarding the Funds; Risk
                                                              Factors; Information About the Funds;
                                                              Additional Information

7.       Voting Information                                   Important Information You Should
                                                              Consider; Information Relating to Voting
                                                              Matters

8.       Interest of Certain Persons and Experts              Information Relating To Voting Matters

9.       Additional Information Required for Reoffering       Not applicable
         by Persons Deemed to be Underwriters


Part B

10.      Cover Page                                           Statement of Additional Information Cover
                                                              Page

11.      Table of Contents                                    Table of Contents

12.      Additional Information About the Registrant          Statement of Additional Information of
                                                              Prime

13.      Additional Information About the Company             Statements of Additional Information of
         Being Acquired                                       Cash Reserve

14.      Financial Statements                                 Pro Forma Financial Statements



Part C

Information required to be included in Part C is set forth under the appropriate
item, so numbered, in Part C of this Registration Statement.

                          American Century Investments
                                4500 Main Street
                           Kansas City, Missouri 64111

June 8, 1998


Dear American Century-Benham Cash Reserve Fund Shareholder:

         I am writing to ask for your support of an important proposal affecting
your fund.  The  proposal  will be voted on at an  upcoming  Special  Meeting of
shareholders to be held on Friday,  August 7, 1998. Please take a few minutes to
read the enclosed materials, complete and sign the proxy voting card and mail it
back to us.

         As a shareholder of American  Century-Benham Cash Reserve Fund, you are
being asked to approve the combination of your fund with American Century-Benham
Prime Money Market Fund.

         The reason for the  combination is that the funds are very similar,  as
you will see by reading the enclosed  materials.  Each fund was started prior to
the 1995  combination of the Benham and Twentieth  Century mutual fund families.
As a result of that combination, the funds share portfolio managers.  Management
believes  it will be  more  efficient  to have  the  funds'  talented  portfolio
management team focus on a single,  larger  portfolio of assets than to continue
managing two very similar, smaller portfolios.

         The Board of Directors of your fund has  unanimously  voted in favor of
this reorganization and believes the combination is in your fund's and your best
interests.  We  encourage  you to vote "FOR" the  reorganization.  The  enclosed
materials give more detailed  information about the proposed  reorganization and
the reasons why we recommend you vote for it.

         If you lead a busy life, you're probably tempted to put these materials
aside,  having the best  intentions  to return to them at another  time.  PLEASE
DON'T DO THAT. If shareholders don't return their proxies,  additional  expenses
must be incurred to pay for  follow-up  mailings and phone calls.  PLEASE TAKE A
FEW MINUTES TO REVIEW THE ENCLOSED MATERIALS AND SIGN AND RETURN YOUR PROXY CARD
TODAY. If you have any questions or need any help in voting your shares,  please
call us at 1-800-345-2021.

         To more efficiently handle this proxy solicitation,  we have hired D.F.
King & Co., Inc. to act as our proxy solicitor. They might be calling you during
the  solicitation  process to ensure that you do not have  questions or concerns
about the voting process and to assist you with your vote.

         Thank you for your time in  considering  this  important  proposal.  We
believe the reorganization  will enable us to better serve your needs. Thank you
for investing with American Century and for your continued support.

                                                 Sincerely,

                                                 /s/ James E. Stowers III
                                                     James E. Stowers III
                                                     Chief Executive Officer

                    IMPORTANT INFORMATION YOU SHOULD CONSIDER

         The  following Q&A is a brief summary of some of the issues that may be
important  to you.  As is  true  with  all  summaries,  however,  not all of the
information  or topics that you may think are important  will be included.  As a
result,  this Q&A is qualified in its entirety by the more detailed  information
contained elsewhere in this document, or incorporated into this document. Please
read all the enclosed proxy  materials  before voting.  PLEASE  REMEMBER TO VOTE
YOUR SHARES AS SOON AS POSSIBLE. If enough shareholders return their proxy cards
soon, additional costs for follow-up mailings and phone calls may be avoided.


Q.       What is the purpose of the upcoming meeting?

         A.       Your Board of Directors has  recommended  merging Cash Reserve
                  into Prime. This combination  requires  shareholder  approval.
                  The  meeting  will be held on Friday,  August 7, 1998 at 10:00
                  a.m.  (Central  time) at American  Century  Tower I, 4500 Main
                  Street,  Kansas City,  Missouri.  Shareholders of record as of
                  the close of business on May 15, 1998 are eligible to vote.

Q.       Why is the reorganization being proposed?

         A.       The reorganization seeks to improve operational and investment
                  management  efficiencies  by  combining  funds with  identical
                  investment  objectives and  substantially  similar  investment
                  policies,  approaches,  procedures  and portfolio  securities.
                  Combining   these  similar  funds  will  also  help  eliminate
                  customer confusion regarding which fund to choose.

Q.       How will the reorganization be accomplished?

         A.       Shareholders  of Cash  Reserve  are being asked to approve the
                  combination of their fund with Prime pursuant to the Agreement
                  and  Plan  of   Reorganization   described  on  page  __.  The
                  reorganization  will take the form of a sale of assets by Cash
                  Reserve in exchange  for shares of Prime.  Cash  Reserve  will
                  then make a  liquidating  distribution  of those shares to its
                  shareholders.

Q.       What will shareholders get if the reorganization is approved?

         A.       As a result of the liquidating distribution,  you will receive
                  shares of Prime in an amount equal to the value of your shares
                  on the date  the  combination  takes  place  (probably  August
                  29th).  Since both  funds  seek to  maintain a $1.00 net asset
                  value  (price  per  share),  the net asset  value of the funds
                  should be the same on the merger date. As a result, you should
                  receive the same number of shares of Prime as you have in Cash
                  Reserve,  and the  TOTAL  VALUE  of  your  account  after  the
                  reorganization WILL BE THE SAME as before the reorganization.

Q.       Why did the Board of Directors approve the reorganization?

         A.       After   reviewing  many  factors,   your  Board  of  Directors
                  unanimously determined that the reorganization was in the best
                  interests  of Cash Reserve and its  shareholders.  Some of the
                  factors considered include:

                  o        the management fees of the funds are the same;

                  o        the funds'  investment  objectives  and  policies are
                           substantially similar;

                  o        combining  the  funds  will  enable  the  manager  to
                           achieve management and operational efficiencies; and

                  o        the  funds  have  the  same  investment  advisor  and
                           portfolio management team.

                  o        the   funds   are   currently    being   managed   in
                           substantially the same manner.

Q.       Will the  exchange  for shares of Prime cause you to realize  income or
         capital gains for tax purposes?

         A.       No.  The  exchange  of  shares in the  reorganization  will be
                  tax-free.  We will obtain a legal opinion  confirming that the
                  reorganization will not be a taxable event for you for federal
                  income tax  purposes.  Your tax basis and  holding  period for
                  your shares will be unchanged.

Q.       How do the fee  structure  and total  expense ratio of Prime compare to
         Cash Reserve?

         A.       The fees and total expense ratios of the funds are the same.

Q.       Is Prime riskier than Cash Reserve?

         A.       No. Both funds are money market funds with  substantially  the
                  same investment policies, procedures and strategies.

Q.       If shareholders send their proxies in now as requested, can they change
         their vote later?

         A.       Yes!  A proxy can be  revoked at any time by writing to us, or
                  by sending us another  proxy,  or by showing up at the meeting
                  and  voting  in  person.  Even  if you  plan to show up at the
                  meeting to vote in person, we ask that you return the enclosed
                  proxy. Doing so will help us achieve a quorum for the meeting.

Q.       How do shareholders vote their shares?

         A.       You can vote by mail,  phone,  fax or in person at the Special
                  Meeting. To vote by mail, complete, sign and mail the enclosed
                  proxy voting card to us in the enclosed postage-paid envelope.
                  You can fax your vote by  signing  the proxy  voting  card and
                  faxing both sides of the card to  1-888-796-9932.  D.F. King &
                  Co.,   our  proxy   solicitor,   can  accept  your  vote  over
                  phone--simply call  1-800-488-8095.  Your shares will be voted
                  EXACTLY as you tell us. If you simply sign the card and return
                  it,  we  will  follow  the  recommendation  of your  Board  of
                  Directors and vote it "FOR" the  reorganization.  You may also
                  vote in person at the meeting on August 7, 1998.

Q.       When and how will the combination take place?

         A.       Subject to receiving shareholder approval,  the reorganization
                  is scheduled to take place on August 29, 1998. After the funds
                  have  calculated the value of their assets and  liabilities on
                  August  28th,  Cash  Reserve  will  transfer  its  assets  and
                  liabilities to Prime in exchange for the appropriate number of
                  Prime  shares.  Cash  Reserve  will  then  make a  liquidating
                  distribution  of those  shares  pro  rata to its  shareholders
                  according to the value of their accounts  immediately prior to
                  the  transfer of assets.  THE VALUE OF YOUR  ACCOUNT  WILL NOT
                  CHANGE AS A RESULT OF THIS REORGANIZATION.

Q.       Will the reorganization affect the management team of Cash Reserve?

         A.       No.  The  portfolio  managers  of Cash  Reserve  also serve as
                  portfolio managers for Prime.

Q.       How will the  distribution,  purchase  and  redemption  procedures  and
         exchange rights change as a result of the reorganization?

         A.       They  won't.  Prime has the same  distribution,  purchase  and
                  exchange policies and procedures as Cash Reserve.

Q.       Where can shareholders get more information about the funds?

         A.       A copy of Prime's Prospectus accompanies this proxy statement.
                  In addition,  the  Manager's  Discussion  and Analysis of Fund
                  Performance  portion of Prime's most recent  Annual  Report to
                  Shareholders  is included in this  document as Appendix II. If
                  you would like a copy of Cash  Reserve's  prospectus or either
                  fund's  Statement of  Additional  Information,  or most recent
                  annual or semiannual  report,  please call one of our Investor
                  Services Representatives at 1-800-345-2021.

                       AMERICAN CENTURY MUTUAL FUNDS, INC.

                          American Century Investments
                                4500 Main Street
                                P. O. Box 419200
                        Kansas City, Missouri 64141-6200
                                 (800) 345-2021

                    NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                          To be held on August 7, 1998


To American Century-Benham Cash Reserve Shareholders:

         NOTICE IS HEREBY GIVEN THAT a Special  Meeting of the  shareholders  of
the American  Century-Benham  Cash Reserve Fund, a portfolio of American Century
Mutual Funds,  Inc. ("Cash  Reserve") will be held at American  Century Tower I,
4500 Main Street,  Kansas City, Missouri on Friday, August 7, 1998 at 10:00 a.m.
(Central time) for the following purposes:

                  ITEM 1. To  consider  and act upon a  proposal  to  approve an
         Agreement and Plan of Reorganization and the transactions  contemplated
         thereby, including:

         (a)      the   transfer  of   substantially   all  of  the  assets  and
                  liabilities  of Cash  Reserve to the  American  Century-Benham
                  Prime Money Market Fund, an  investment  portfolio of American
                  Century  Investment  Trust, as described in the attached proxy
                  statement ("Prime") in exchange for shares in Prime; and

         (b)      the distribution of Prime's shares to the shareholders of Cash
                  Reserve according to their respective interests.

                  ITEM 2. To transact  such other  business as may properly come
         before the Special Meeting or any adjournment(s) thereof.

         The proposed  reorganization,  the Agreement and Plan of Reorganization
and related  matters are  described  in the attached  Combined  Prospectus/Proxy
Statement.

         Shareholders of record as of the close of business on May 15, 1998, are
entitled to notice of, and to vote at, the Special Meeting or any adjournment(s)
thereof.

PLEASE  EXECUTE AND RETURN  PROMPTLY IN THE ENCLOSED  ENVELOPE THE  ACCOMPANYING
PROXY  CARD,  WHICH IS BEING  SOLICITED  BY THE BOARD OF  DIRECTORS  OF AMERICAN
CENTURY  MUTUAL  FUNDS,  INC.  PLEASE  RETURN  YOUR  PROXY  CARD EVEN IF YOU ARE
PLANNING  TO ATTEND THE  MEETING.  THIS IS  IMPORTANT  TO ENSURE A QUORUM AT THE
MEETING.  PROXIES  MAY BE  REVOKED  AT ANY TIME  BEFORE  THEY ARE  EXERCISED  BY
SUBMITTING A WRITTEN NOTICE OF REVOCATION,  OR A SUBSEQUENTLY EXECUTED PROXY, OR
BY ATTENDING THE MEETING AND VOTING IN PERSON.


                              /s/ Patrick A. Looby
                                  Patrick A. Looby
                                  Secretary

                                  June 8, 1998


                       COMBINED PROSPECTUS/PROXY STATEMENT
                                       of
                       AMERICAN CENTURY MUTUAL FUNDS, INC.
                                       and
                        AMERICAN CENTURY INVESTMENT TRUST


                                  June 8, 1998

         This  Combined  Prospectus/Proxy  Statement is furnished in  connection
with the  solicitation  of votes by the Board of Directors  of American  Century
Mutual Funds,  Inc. on behalf of its Cash Reserve  Fund,  in  connection  with a
Special Meeting of  Shareholders  to be held on Friday,  August 7, 1998 at 10:00
a.m. (Central time) at American Century Tower I, 4500 Main Street,  Kansas City,
Missouri.

         At the Special  Meeting,  shareholders  of the American  Century-Benham
Cash Reserve Fund ("Cash Reserve") are being asked to approve the combination of
their fund into the American Century-Benham Prime Money Market Fund, a series of
American Century Investment Trust ("Prime").

         The funds are similarly managed diversified, open-end mutual funds that
invest  in a  similar  mix  of  fixed  income  securities.  The  purpose  of the
reorganization  is  to  achieve  management  and  operational   efficiencies  by
combining  these  similar  funds.  Each  fund  has  shares  registered  with the
Securities and Exchange Commission.

         This  Combined   Prospectus/Proxy   Statement   constitutes  the  Proxy
Statement of your fund for the Special Meeting of Shareholders  and a prospectus
for the  Prime  shares  that  are to be  issued  to you in  connection  with the
reorganization.  It is intended to give you the information you need to consider
and vote on the proposed  reorganization.  You should  retain this  document for
future  reference.  A Statement of Additional  Information,  dated June 1, 1998,
about  Prime has been filed with the  Commission  [to be filed  pursuant to Rule
485(b)  prior  to the  effectiveness  of  this  Registration  Statement]  and is
incorporated  into  this  document  by  reference.  A copy of the  Statement  of
Additional Information may be obtained without charge upon request by calling or
writing to us at the address or telephone number set forth below.

         The principal  executive  offices of Cash Reserve and Prime are located
at American  Century  Investments,  4500 Main Street,  P. O. Box 419200,  Kansas
City, Missouri 64141-6200. The funds' telephone number is 1-800-345-2021.

         A  copy  of  Prime's  prospectus   accompanies  this  document  and  is
incorporated into it by reference.

         The information contained in this Combined  Prospectus/Proxy  Statement
is required by rules of the Securities and Exchange  Commission,  and some of it
is highly  technical.  If you have any questions about these materials or how to
vote your shares, please call us at 1-800-345-2021.

LIKE ALL MUTUAL  FUND  SHARES,  THE  SECURITIES  OF THE PRIME FUND HAVE NOT BEEN
APPROVED OR DISAPPROVED  BY THE SECURITIES AND EXCHANGE  COMMISSION OR ANY STATE
SECURITIES  COMMISSION,  NOR HAS THE SECURITIES  AND EXCHANGE  COMMISSION OR ANY
STATE SECURITIES  COMMISSION PASSED ON THE ADEQUACY OR ACCURACY OF THIS COMBINED
PROSPECTUS/PROXY  STATEMENT.  ANY  REPRESENTATION  TO THE CONTRARY IS A CRIMINAL
OFFENSE.

         No person has been  authorized to give any  information  or to make any
representations  other than those  contained in this  Combined  Prospectus/Proxy
Statement and in the materials expressly  incorporated  herein by reference.  If
given or made, such other information or representations must not be relied upon
as having been  authorized  by Cash  Reserve,  Prime or anyone  affiliated  with
American Century Investments.

         PLEASE NOTE THAT THE SPECIAL MEETING OF SHAREHOLDERS WILL BE A BUSINESS
MEETING ONLY AND IS NOT A SHAREHOLDER SEMINAR.

                                TABLE OF CONTENTS

IMPORTANT INFORMATION YOU SHOULD CONSIDER.....................................
COMPARISON OF CERTAIN INFORMATION REGARDING THE FUNDS.........................
RISK FACTORS..................................................................
TRANSACTION AND OPERATING EXPENSE INFORMATION.................................
ADDITIONAL INFORMATION ABOUT THE PROPOSED TRANSACTION.........................
         Summary of Plan of Reorganization....................................
         Description of the Securities of Prime...............................
         Reasons Supporting the Reorganization................................
         Federal Income Tax Consequences......................................
         Capitalization.......................................................
INFORMATION ABOUT THE FUNDS...................................................
         Prime and Cash Reserve...............................................
         Fundamental Investment Restrictions..................................
INFORMATION RELATING TO VOTING MATTERS........................................
         General Information..................................................
         Voting and Revocation of Proxies.....................................
         Record Date..........................................................
         Quorum...............................................................
         Shareholder Vote Required............................................
         Cost of Proxy Solicitation...........................................
         Certain Shareholders.................................................
         Appraisal Rights.....................................................
         Annual Meetings......................................................
ADDITIONAL INFORMATION........................................................
LITIGATION....................................................................
FINANCIAL STATEMENTS..........................................................
OTHER BUSINESS................................................................
SHAREHOLDER INQUIRIES.........................................................
MANAGEMENT'S DISCUSSION.......................................................



                        COMPARISON OF CERTAIN INFORMATION
                               REGARDING THE FUNDS

         The  following  chart is provided to show a  comparison  of certain key
attributes  of Cash Reserve with Prime.  For  additional  information  about the
funds, see the section titled "Information About the Funds" starting at page ___
below.

                                                                  
                                     Cash Reserve                        Prime
                                     ----------------------------------------------------------------------------
Type of Fund                         Money Market Fund                   Money Market Fund

Investment Objective                 Seeks to obtain maximum current     Seeks the highest level of
                                     income consistent with the          current income consistent with
                                     preservation of principal and       preservation of capital
                                     maintenance of liquidity

Investment Policies                  Pursues its objective by            Pursues its objective by
                                     investing in money market           investing in money market
                                     instruments and other short-term    instruments and other short-term
                                     obligations of banks,               obligations of banks,
                                     corporations and governments        corporations and governments

Weighted Average Portfolio           90 days                             90 days
    Maturity

Credit Quality                       High quality securities only        High quality securities only

Investor Class Total Expense         0.60%                               0.60%
    Ratio

Advisor Class Total Expense          0.85%                               0.85%
    Ratio

Distribution Policy                  Same as Prime                       Dividends are declared daily,
                                                                         paid monthly

Purchases and Exchanges              Same as Prime                       See pages 11-13 of accompanying
                                                                         Prospectus

Redemption Policies                  Same as Prime                       See page 13 of accompanying
                                                                         Prospectus

Investment Advisor                   American Century Investment         ACIM
                                     Management, Inc. ("ACIM")

Transfer Agent                       American Century Services           American Century Services
                                     Corporation                         Corporation

Distributor                          Funds Distributor, Inc.             Funds Distributor, Inc.

Custodians                           Chase Manhattan Bank                Chase Manhattan Bank

Independent Auditors                 Deloitte & Touche LLP               Coopers & Lybrand



RISK FACTORS

         Because each of the funds has the same investment  objective and shares
substantially similar investment policies, approaches and procedures, your Board
of Directors does not believe that the  reorganization  exposes  shareholders of
Cash  Reserve  to any  new or  different  risks  than  they  are  exposed  to as
shareholders  of  Cash  Reserve.  For a  discussion  of the  various  investment
policies,   approaches  and  procedures  of  Prime,  and  the  risks  associated
therewith, please see the accompanying Prospectus beginning at page 7.

TRANSACTION AND OPERATING EXPENSE INFORMATION

         The tables below compare  various  shareholder  transaction  and annual
fund  operating  expenses of Cash Reserve as of its most recent  fiscal year end
(October 31, 1997) and Prime as of its most recent fiscal year end (February 28,
1998). After the  reorganization,  the expense levels of the surviving fund will
be the same as those shown for Prime.



                                                                   Cash
                                                                   Reserve              Prime
                                                                   -------              -----
                                                                                    
SHAREHOLDER TRANSACTION EXPENSES:
Maximum Sales Load Imposed on Purchases .........................  none                 none
Maximum Sales Load Imposed on Reinvested Dividends ..............  none                 none
Deferred Sales Load .............................................  none                 none
Redemption Fee ..................................................  none(1)              none(1)
Exchange Fee ....................................................  none                 none

ANNUAL FUND OPERATING EXPENSES - INVESTOR CLASS
(as a percentage of net assets)
Management Fees .................................................  0.60%                0.60%
12b-1 Fees ......................................................  none                 none
Other Expenses ..................................................  0.00%(2)             0.00%(2)
                                                                   ----------           ----------
Total Fund Operating Expenses ...................................  0.60%                0.60%
                                                                   ----------           ----------
EXAMPLE:
You would pay the following expenses              1 year           $  6                  $ 6
on a $1,000 investment, assuming a 5%             3 years            19                   19
annual return and redemption at the               5 years            33                   33
end of each time period.                          10 years           75                   75



ANNUAL FUND OPERATING EXPENSES - ADVISOR CLASS
(as a percentage of net assets)
Management Fees .................................................  0.35%                0.35%
12b-1 Fees ......................................................  0.50%                0.50%
Other Expenses ..................................................  0.00%(2)             0.00%(2)
                                                                   ----------           ----------
Total Fund Operating Expenses ...................................  0.85%                0.85%
                                                                   ----------           ----------
EXAMPLE:
You would pay the following expenses              1 year           $  9                  $ 9
on a $1,000 investment, assuming a 5%             3 years            27                   27
annual return and redemption at the               5 years            47                   47
end of each time period.                          10 years          105                  105
- ----------


(1)      Redemption  proceeds  sent  by wire  are  subject  to a $10  processing
         charge.

(2)      Other Expenses,  which include the fees and expenses  (including  legal
         counsel fees) of those  directors who are not  "interested  persons" as
         defined in the  Investment  Company  Act,  were less than 0.01 of 1% of
         average net assets for the funds' most recent fiscal year.


         The  purpose of the above  tables is to help you  compare  the  various
costs and expenses that shareholders bear,  directly or indirectly,  as a result
of owning shares of the funds. The example set forth above assumes  reinvestment
of all  dividends  and  distributions  and uses a 5%  annual  rate of  return as
required by Securities and Exchange Commission regulations.  NEITHER THE 5% RATE
OF RETURN NOR THE EXPENSES  SHOWN SHOULD BE  CONSIDERED  INDICATIONS  OF PAST OR
FUTURE RETURNS AND EXPENSES.  ACTUAL RETURNS AND EXPENSES MAY BE GREATER OR LESS
THAN THOSE SHOWN.

              ADDITIONAL INFORMATION ABOUT THE PROPOSED TRANSACTION

SUMMARY OF PLAN OF REORGANIZATION

         Subject to receipt of shareholder approval,  the reorganization will be
carried out pursuant to the terms of the  Agreement  and Plan of  Reorganization
between the funds.  The  following is a brief  summary of some of the  important
terms of that Agreement.

         EFFECTIVE TIME OF THE  REORGANIZATION.  The Agreement requires that the
exchange  of assets  for stock  take place  after the close of  business  on one
business day but before (or as of) the opening of business on the next  business
day (the "Effective Time"). It is currently  anticipated that the reorganization
will take place after the close of business on August 28,  1998,  but before (or
as of) the opening of business on August 31, 1998. However,  the Agreement gives
the officers of the funds the flexibility to choose another date.

         EXCHANGE OF ASSETS.  After the close of business  on August  28th,  the
funds  will  determine  the value of their  assets and  liabilities  in the same
manner as described on page 17 in the enclosed Prime Prospectus.  The assets and
liabilities  of the Cash Reserve will then be  transferred  to Prime in exchange
for that number of full and  fractional  shares  (rounded  to the third  decimal
place)  that have the same  aggregate  net  asset  value as the value of the net
assets received in the exchange. Cash Reserve will retain enough cash to pay any
unpaid dividends payable by it.

         LIQUIDATING DISTRIBUTIONS AND TERMINATION OF CASH RESERVE.  Immediately
after the  exchange  of its  assets  for the Prime  shares,  Cash  Reserve  will
distribute  pro  rata  all  of  the  shares  received  in  the  exchange  to its
shareholders of record at the Effective  Time. All of the outstanding  shares of
Cash Reserve will be redeemed  and canceled and their stock books  closed.  As a
result, Cash Reserve shareholders will become shareholders of Prime.

         SHAREHOLDER  APPROVAL.  Consummation  of  the  reorganization  requires
approval of Cash Reserve's shareholders.

         REPRESENTATIONS AND WARRANTIES.  The Agreement contains representations
and warranties made by Cash Reserve to Prime concerning Cash Reserve's formation
and  existence  under   applicable  state  law,  its  power  to  consummate  the
reorganization,  its  qualification  as a "regulated  investment  company" under
applicable tax law, the  registration  of its shares under federal law and other
matters that are customary in a reorganization of this type. The representations
and warranties terminate at the Effective Time.

         CONDITIONS TO CLOSING. The Agreement contains conditions to closing the
proposed  reorganization for the benefit of each fund. The conditions to closing
the  reorganization  requires  approval by Cash Reserve  shareholders,  that all
representations  of the funds be true in all material  respects,  receipt of the
legal opinion  described on page __ below under the caption  "Federal Income Tax
Consequences,"  and other matters that are customary in a reorganization of this
type.

         TERMINATION OF AGREEMENT.  The Agreement may be terminated by a fund as
a  result  of a  failure  by the  other  fund to meet one of its  conditions  to
closing, or by mutual consent.

         GOVERNING LAW. The Agreement states that it is to be interpreted  under
Massachusetts law, the state of organization of Prime.

DESCRIPTION OF THE SECURITIES OF PRIME

         Prime is a series of shares  offered  by  American  Century  Investment
Trust.  Each  series  is  commonly  referred  to as a mutual  fund.  The  assets
belonging to each series of shares are held separately by the custodian.

         American Century  Investment  Trust is a Massachusetts  business trust,
which means its  activities  are  overseen by a Board of Trustees  rather than a
Board of  Directors.  The  function  of the Board of Trustees is the same as the
function of the Board of Directors of Cash Reserve.

         Like Cash Reserve,  Prime currently  offers two classes of shares,  the
Investor Class and the Advisor Class,  although it may offer additional  classes
in the future.  The Investor Class of shares of Prime have no up-front  charges,
commissions  or 12b-1 fees.  The Advisor Class of shares have no up-front  fees,
charges  or  commissions,  but carry a 0.50%  12b-1  fee to pay for  shareholder
services and distribution costs.

         Your Board of  Directors  believes  there are no  material  differences
between  the  rights of a Cash  Reserve  shareholder  and the  rights of a Prime
shareholder.  Each  share,  irrespective  of  series  or class of a  series,  is
entitled to one vote for each dollar of net asset value applicable to such share
on all  questions,  except for those matters that must be voted on separately by
the series or class of a series affected.  Matters affecting only one class of a
series are voted upon only by that series or class.

         Shares have non-cumulative  voting rights, which means that the holders
of more than 50% of the votes cast in an election  of trustees  can elect all of
the  trustees  if they  choose to do so,  and in such  event the  holders of the
remaining  votes will not be able to elect any person or persons to the Board of
Trustees.

         Unless  required  by the  Investment  Company  Act of  1940,  it is not
necessary  for  Prime to hold  annual  meetings  of  shareholders.  As a result,
shareholders  may  not  vote  each  year  on the  election  of  trustees  or the
appointment of auditors. However, pursuant to each fund's bylaws, the holders of
at least 10% of the votes  entitled  to be cast may  request  the fund to hold a
special meeting of shareholders.

REASONS SUPPORTING THE REORGANIZATION

         The reasons  supporting the combination of these funds are described in
the Q&A at the front of this  document.  Prime and Cash Reserve  both  commenced
operations  before the  combination of the Benham family of mutual funds and the
Twentieth Century family of mutual funds. Although the funds were similar at the
time of the Benham/Twentieth  Century merger, they have become even more similar
as a result of the  integration  of the two  investment  advisory  firms and the
appointment of the same portfolio management team for both funds. As a result of
the redundancy of these two funds in its fund line-up, American Century believes
that  combining Cash Reserve with Prime will create  operational  and management
efficiencies.   In  addition,  the  combination  will  help  eliminate  customer
confusion regarding which fund to choose.

FEDERAL INCOME TAX CONSEQUENCES

         Consummation of the  reorganization is subject to the condition that we
receive a legal  opinion to the effect that for federal  income tax purposes (i)
no gain or loss will be  recognized  by you,  Cash  Reserve or Prime,  (ii) your
basis in the Prime shares that you receive will be the same as your basis in the
Cash Reserve shares held by you  immediately  prior to the  reorganization,  and
(iii) your holding  period for the Prime shares will include your holding period
for your Cash Reserve shares.

         We have not sought a tax ruling from the Internal Revenue Service,  but
are relying upon the opinion of counsel  referred to above.  That opinion is not
binding on the IRS and does not preclude  them from taking a contrary  position.
The opinion does not cover state or local taxes and you should  consult your own
advisers concerning the potential tax consequences.

         The  Agreement  and Plan of  Reorganization  provides that Cash Reserve
will declare  dividends  prior to the  reorganization  which,  together with all
previous  dividends,  will have the effect of  distributing  to the Cash Reserve
shareholders  all  undistributed  ordinary income earned up to and including the
effective time of the  reorganization.  The  distribution is necessary to ensure
that the  reorganization  will not create tax consequences to Cash Reserve.  The
distributions  to shareholders  generally will be taxable to the extent ordinary
distributions are taxable to such shareholders.

CAPITALIZATION

         As of March 31, 1998, (i) the  capitalization  of the Investor Class of
Cash Reserve and Prime are $1,149,158,609 and $1,432,842,728,  respectively, and
the pro forma  capitalization  of Prime  after the  merger,  as adjusted to give
effect to the reorganization, is $2,582,001,337;  and (ii) the capitalization of
the Advisor  Class of Cash  Reserve is  $3,333,856.  As of March 31,  1998,  the
Advisor Class of Prime had no assets.  If  consummated,  the  capitalization  of
Prime will be different at the effective time of the  reorganization as a result
of daily share purchase and redemption activity in the funds.

                           INFORMATION ABOUT THE FUNDS

         Complete information about Prime and Cash Reserve is contained in their
respective   Prospectuses.   The  Prime   Prospectus   is  included   with  this
Prospectus/Proxy  Statement, and the Cash Reserve Prospectus is available to you
by  calling  us  at   1-800-345-2021.   The  content  of  both  Prospectuses  is
incorporated  into  this  document  by  reference.  Below  is a list of types of
information  about Prime and Cash  Reserve  and the pages in their  Prospectuses
where the information can be found.


INFORMATION ABOUT THE               CAN BE FOUND ON THE
FOLLOWING ITEMS                     FOLLOWING PAGES
- ---------------------               -----------------------------------------------------------
                                                                       Cash             Cash
                                    Prime            Prime             Reserve          Reserve
                                    Investor         Advisor           Investor         Advisor
                                    Class            Class             Class            Class
                                    -----            -----             -----            -----
                                                                            
Condensed financial
information

    See "Financial Highlights"      page 5           page __           page 5           page 5

Organization, proposed
operation, investment
objective and policies

    See "Further Information
           about American
           Century"                 page 22          page __           page 20          page 16
        "Investment Polices of
           the Fund"                pages 6-9        page __           page 6           page 7
        "Other Investment
           Practices, Their
           Characteristics
           and Risks"               page 9           page __           pages 6-8        pages 7-9

Management

    See "Management-Investment
        Management"                 page 19          page __           pages 18-19      page 14

Dividend and distribution
policies and tax consequences

    See "Distributions"             page 18          page __           pages 16-17      pages 12-13
        "Taxes"                     pages 18-19      page __           pages 17-18      pages 13-14

"Net asset value"

    See "When Share Price
        is Determined"              page 17          page __           page 16          page 12

Transaction and operating
expenses

    See "Transaction and
        Operating Expense
        Table"                      page 4           page __           page 4           page 4

Distribution of shares

    See "Distribution of Fund
           Shares"                  page 21          page __           pages 19-20      page 15
        "Transfer and
           Administrative
           Services"                page 20          page __           page 19          page 15


                                                                       Cash             Cash
                                    Prime            Prime             Reserve          Reserve
                                    Investor         Advisor           Investor         Advisor
                                    Class            Class             Class            Class
                                    -----            -----             -----            -----

Minimum initial and
subsequent investments

    See "How to Open An
           Account"                 pages 11-12      N/A               pages 10-11      N/A
        "How to Purchase and
           Sell American
           Century Funds"           N/A              N/A               N/A              page 11

Voting rights and restrictions
of shareholders

    See "Further Information
        About American Century"     page 22          page __           page 20          page 16

Redemption procedures
and policies

    See "How to Redeem Shares"      page 13          page __           page 12          page 11
        "Redemption of Shares
           in Low-Balance
           Accounts"                page 14          page __           pages 12-13      N/A


FUNDAMENTAL INVESTMENT RESTRICTIONS

         Neither Cash Reserve nor Prime may change its investment  objectives or
any of its investment  policies designated as "fundamental" in its Prospectus or
Statement of Additional  Information  without  shareholder  approval.  As stated
above, the funds have substantially similar investment objectives,  policies and
strategies.

                     INFORMATION RELATING TO VOTING MATTERS

GENERAL INFORMATION

         This  Combined   Prospectus/Proxy   Statement  is  being  furnished  in
connection  with the  solicitation  of proxies by the Board of Directors of Cash
Reserve.  Proxies may be solicited by officers and  employees of the  investment
advisor of the funds, their affiliates and employees. It is anticipated that the
solicitation  of proxies  will be  primarily  by mail,  telephone,  facsimile or
personal  interview.  Authorizations  to  execute  proxies  may be  obtained  by
telephonic  or  electronically   transmitted  instructions  in  accordance  with
procedures  designed to authenticate the  shareholder's  identity and to confirm
that the  shareholder has received the Combined  Prospectus/Proxy  Statement and
proxy card. If you have any questions regarding voting your shares or the proxy,
please call us at 1-800-345-2021.

VOTING AND REVOCATION OF PROXIES

         The fastest and most convenient way to vote your shares is to complete,
sign and mail the enclosed  proxy  voting card to us in the  enclosed  envelope.
This  will  help us  obtain a  quorum  for the  meeting  and  avoid  the cost of
additional proxy solicitation efforts. In addition,  you may vote by faxing both
sides of the completed  proxy card to  1-888-796-9932,  or by calling D.F. King,
our proxy solicitor, at 1-800-488-8095.  If you return your proxy to us, we will
vote it EXACTLY  as you tell us. If you  simply  sign the card and return it, we
will  follow the  recommendation  of the Board of  Directors  and vote "FOR" the
reorganization.

         Any  shareholder  giving a proxy may revoke it at any time before it is
exercised  by  submitting  a written  notice of  revocation,  or a  subsequently
executed proxy, or by attending the meeting and voting in person.

RECORD DATE

         Only  shareholders  of record at the close of  business on May 15, 1998
will be  entitled  to vote at the  meeting.  On that  date,  the number of votes
outstanding  and entitled to be voted at the meeting or any  adjournment  of the
meeting for the Investor Class was  ________________;  and for the Advisor Class
was _________________.

QUORUM

         A quorum is the  number of  shareholders  legally  required  to be at a
meeting in order to conduct  business.  The quorum for the Special  Shareholders
Meeting is 50% of the outstanding shares of Cash Reserve entitled to vote at the
meeting.  Shares  may be  represented  in person or by proxy.  Proxies  properly
executed and marked with a negative vote or an abstention  will be considered to
be present at the meeting for the  purposes of  determining  the  existence of a
quorum  for the  transaction  of  business.  If a quorum is not  present  at the
meeting,  or if a quorum is present at the meeting but sufficient  votes are not
received to approve the Agreement and Plan of Reorganization,  the persons named
as proxies may propose one or more adjournments of the meeting to permit further
solicitation of proxies.  Any such adjournment will require the affirmative vote
of a majority of those shares affected by the  adjournment  that are represented
at the meeting in person or by proxy.  If a quorum is not  present,  the persons
named as proxies will vote those proxies for which they are required to vote FOR
the Agreement and Plan of Reorganization in favor of such adjournments, and will
vote those  proxies for which they are required to vote  AGAINST such  proposals
against any such adjournments.

SHAREHOLDER VOTE REQUIRED

         The  Agreement  and  Plan of  Reorganization  must be  approved  by the
holders of a majority of the outstanding  votes of each class of Cash Reserve in
accordance  with  the  provisions  of its  Articles  of  Incorporation  and  the
requirements  of the  Investment  Company Act of 1940. The term "majority of the
outstanding shares" means more than 50% of its outstanding shares.

         In tallying shareholder votes,  abstentions and broker non-votes (i.e.,
proxies sent in by brokers and other nominees that cannot be voted on a proposal
because  instructions have not been received from the beneficial owners) will be
counted  for  purposes  of  determining  whether or not a quorum is present  for
purposes of  convening  the  meeting.  Abstentions  and broker  non-votes  will,
however,  be  considered  to  be a  vote  against  the  Agreement  and  Plan  of
Reorganization.

         The approval of the  reorganization by the shareholders of Prime is not
being solicited because their approval is not legally required.

COST OF PROXY SOLICITATION

         The cost of the proxy  solicitation  and  shareholder  meeting  will be
borne  by  American  Century  Investment   Management,   Inc.  and  NOT  by  the
shareholders of the funds.

CERTAIN SHAREHOLDERS

         The following tables list, as of May 15, 1998, the names, addresses and
percentage of ownership of each person who owned of record or is known by either
fund to own  beneficially 5% or more of any class of Cash Reserve or Prime.  The
percentage of shares to be owned after  consummation  of the  reorganization  is
based upon their  holdings and the  outstanding  shares of both funds on May 15,
1998.  Beneficial  ownership  information is not required to be disclosed to the
funds, so to the extent that  information is provided below, it is done so using
the best information that the funds have been provided.

                                Number of       Percent of   Percent Owned After
Shareholder Name and Address    Shares Owned    Ownership    Reorganization
- ----------------------------    ------------    ---------    -------------------
- ----------------------------    ------------    ---------    -------------------
- ----------------------------    ------------    ---------    -------------------


         [At May 15,  1998,  the  directors  and  officers of the issuer of Cash
Reserve,  as a group,  owned  less  than 1% of the  outstanding  shares  of Cash
Reserve. At May 15, 1998, the trustees and officers of the issuer of Prime, as a
group, owned less than 1% of the outstanding shares of Prime.]

APPRAISAL RIGHTS

         Shareholders  of Cash  Reserve are not  entitled to any rights of share
appraisal under its Articles of Incorporation, or under the laws of the State of
Maryland.

         Shareholders have, however, the right to redeem their fund shares until
the  reorganization,  and thereafter,  shareholders may redeem from Prime shares
received in the reorganization.  Any such redemption will be made at Prime's net
asset value as determined in accordance with its then-current prospectus.

ANNUAL MEETINGS

         Prime  does  not  intend  to  hold  annual  meetings  of  shareholders.
Shareholders  of Prime have the right to call a special  meeting of shareholders
and such  meeting  will be called  when  requested  in writing by the holders of
record  of 10% or more of the  fund's  votes.  To the  extent  required  by law,
American Century  Investment Trust will assist in shareholder  communications on
such matters.

         Cash Reserve does not intend to hold an annual meeting of  shareholders
this year for the election of directors or the  ratification  of the appointment
of auditors.

                             ADDITIONAL INFORMATION

         Information  about Cash Reserve is  incorporated  into this document by
reference  from its  Prospectus  and Statement of Additional  Information,  each
dated  March 1, 1998,  and  information  about Prime is  incorporated  herein by
reference  from its  Prospectus  and Statement of Additional  Information,  each
dated  June  1,  1998  [to  be  filed  pursuant  to  Rule  485(b)  prior  to the
effectiveness of this  Registration  Statement],  copies of each of which may be
obtained without charge by calling one of our Investor Services  Representatives
at 1-800-345-2021.

         Reports and other  information  filed by Cash  Reserve and Prime may be
inspected and copied at the Public Reference Facilities maintained by the SEC at
450 Fifth Street, N.W., Washington, D.C. 20549, and copies of such materials may
be obtained from the Public  Reference  Branch,  Office of Consumer  Affairs and
Information  Services,  Securities  and Exchange  Commission,  Washington,  D.C.
20549,  at prescribed  rates or by accessing the Web site  maintained by the SEC
(www.sec.gov).

                                   LITIGATION

         Neither  Cash  Reserve  nor  Prime is  involved  in any  litigation  or
proceeding.

                              FINANCIAL STATEMENTS

         The financial  highlights and financial statements for Cash Reserve for
the fiscal year ended  October 31, 1997 are  contained  in its Annual  Report to
Shareholders  and  in  the  Prospectus  and  incorporated  by  reference  in the
Statement  of  Additional  Information  dated  March 1, 1998.  The report on the
financial highlights for the fiscal years 1993, 1994, 1995 and 1996 are included
in its Annual Report to Shareholders for the fiscal year ended October 31, 1996.
Each such Annual Report,  Prospectus and Statement of Additional  Information is
incorporated  by reference into this Combined  Prospectus/Proxy  Statement.  The
financial  highlights and the financial statements for Prime for the fiscal year
ended February 28, 1998 are contained in its Annual Report to  Shareholders  and
in the Prospectus and  incorporated  by reference in the Statement of Additional
Information  dated June 1, 1998 [each to be filed prior to the  effectiveness of
this  Registration  Statement].  The report on the financial  highlights for the
fiscal  years 1994,  1995,  1996 and 1997 are  included in its Annual  Report to
Shareholders  for the fiscal  year ended  February  28,  1997.  Each such Annual
Report,  Prospectus and Statement of Additional  Information is  incorporated by
reference in this Combined Prospectus/Proxy Statement.

         The audited  financial  statements  of Cash Reserve for the fiscal year
ended  October 31, 1997,  contained  in its Annual  Report and  incorporated  by
reference  in this  Combined  Prospectus/Proxy  Statement,  have been audited by
Deloitte & Touche LLP, independent  auditors,  as indicated in their report with
respect  thereto and are  incorporated  herein in reliance on their report given
upon the authority of such firm as experts in accounting and auditing.

         The  audited  financial  statements  of Prime for the fiscal year ended
February  28,  1998  contained  in its Annual  Report [to be filed  prior to the
effectiveness of this  Registration  Statement] and incorporated by reference in
this  Combined  Prospectus/Proxy  Statement,  have  been  audited  by  Coopers &
Lybrand,  independent  public  accountants,  as  indicated  in their report with
respect  thereto and are  incorporated  herein in reliance on their report given
the authority of such firm as experts in accounting and auditing.

                                 OTHER BUSINESS

         The Board of Directors is not aware of any other business to be brought
before the meeting. However, if any other matters come before the meeting, it is
the  intention  that proxies that do not contain  specific  restrictions  to the
contrary  will be voted on such matters in  accordance  with the judgment of the
persons named in the enclosed form of proxy.

                              SHAREHOLDER INQUIRIES

         Shareholder  inquiries  may  be  addressed  to us  at  the  address  or
telephone  number set forth on the cover page of this Combined  Prospectus/Proxy
Statement.


         SHAREHOLDERS  ARE  REQUESTED TO DATE AND SIGN EACH  ENCLOSED  PROXY AND
RETURN IT IN THE ENCLOSED  ENVELOPE.  PLEASE  RETURN YOUR PROXY CARD EVEN IF YOU
ARE  PLANNING  TO ATTEND THE  MEETING.  NO POSTAGE IS  REQUIRED IF MAILED IN THE
UNITED STATES.

                             MANAGEMENT'S DISCUSSION
                               OF FUND PERFORMANCE
                                      PRIME

         The  following  are  excerpts  of   management's   discussion  of  fund
performance  from the Annual  Report dated  February  28, 1998,  of Prime [to be
filed prior to the effectiveness of this Registration Statement]. For a complete
copy of the report, please call us at 1-800-345-2021.

                                REPORT HIGHLIGHTS

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

o  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.

o  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.

o  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.

o  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.

o  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.

o  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.


                                    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.



                               OUR MESSAGE TO YOU


           [Photo 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,



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



                       PERFORMANCE & PORTFOLIO INFORMATION

                                                                       AVERAGE ANNUAL RETURNS
                                                6 MONTHS      1 YEAR      3 YEARS      LIFE OF FUND(2)
TOTAL RETURNS AS OF
FEBRUARY 28, 1998(1)
                                                                                
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%
Fund's Ranking Among Money Market
Instrument Funds(3)                                --     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.



YIELDS AS OF FEBRUARY 28, 1998              PORTFOLIO AT A GLANCE

                       7-DAY     7-DAY                          2/28/98  2/28/97
                      CURRENT  EFFECTIVE    Number of Issuers     58       49
                       YIELD     YIELD      Weighted Average
                                                Maturity        65 days  54 days
Prime Money Market     5.17%     5.30%       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.

                                 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.  We wanted to improve  our  ability to
translate those  potentially  higher rates into higher yields 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 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 60-day  average  maturity  until late  November.
Average  maturity  dipped  in  December,  reflecting  a  temporary  scarcity  of
attractively  priced,  longer-maturity  paper.  When  supply  bounced  back,  we
extended average maturity back out to about 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?

Prime's  Japanese  holdings  were  limited to  securities  backed by  industrial
companies,  such as Mitsubishi,  so the fund was able to avoid the problems that
plagued  securities  issued by Japanese banks and other financial  institutions.
Our  conservative   investment   approach  led  us  to  cut  back  on  even  the
industrial-backed  holdings.  That  resulted  in a slightly  lower yield for the
fund, since the Japanese holdings  generally offered higher yields than the U.S.
commercial paper and asset-backed securities that replaced them.

             PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 2/28/98)
                              Commercial Paper 69%
                             Floating-Rate Notes 16%
                           Asset-Backed Securities 9%
                                     CDs 4%
                                    Other 2%

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

Given the reduction of higher-yielding  Japanese  holdings,  what strategies did
you pursue to maintain the fund's yield?

We continued to search for attractively valued variable rate notes (VRNs), whose
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).  Others are tied to the Fed Funds Rate.
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 the 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
Fed Funds Rate since 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%,  in line with fees currently
charged by other American Century money market funds and their competitors.  The
slightly  higher  fee  could  cause a small  decline  in the  fund's  yield.  We
anticipate no further fee increases in the near future.

             PORTFOLIO COMPOSITION BY CREDIT RATING (as of 2/28/98)
                                    A-1+ 71%
                                     A-1 29%
             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%

PART B

                       AMERICAN CENTURY MUTUAL FUNDS, INC.
                          American Century Investments
                                4500 Main Street
                                 P.O. Box 419200
                        Kansas City, Missouri 64141-6200
                                 1-800-345-2021

                        AMERICAN CENTURY INVESTMENT TRUST
                          American Century Investments
                                4500 Main Street
                                 P.O. Box 419200
                        Kansas City, Missouri 64141-6200
                                 1-800-345-2021

                       Statement of Additional Information

   1998 Special Meeting of Shareholders of American Century Mutual Funds, Inc.

         This Statement of Additional Information is not a prospectus but should
be read in conjunction with the Combined Proxy  Statement/Prospectus  dated June
8, 1998 for the Special  Meeting of  Shareholders  to be held on August 7, 1998.
Copies of the Combined Proxy  Statement/Prospectus  may be obtained at no charge
by calling American Century Mutual Funds, Inc. at 1-800-345-2021.

         Unless  otherwise  indicated,  capitalized  terms  used  herein and not
otherwise  defined  have the same  meanings as are given to them in the Combined
Proxy Statement/Prospectus.

         Further  information  about Prime is contained in and  incorporated  by
reference to its Statement of Additional Information dated June 1, 1998, [ to be
filed pursuant to Rule 485(b) prior to the  effectiveness  of this  Registration
Statement].   The  audited   financial   statements   and  related   independent
accountant's  report for Prime contained in the Annual Report dated February 28,
1998 [to be filed prior to the effectiveness of this Registration Statement] are
incorporated  herein by  reference.  No other  parts of the  Annual  Report  are
incorporated by reference herein.

         Further information about Cash Reserve is contained in and incorporated
by reference to its Statement of Additional Information dated March 1, 1998. The
audited financial  statements and related  independent  accountant's  report for
Cash  Reserve  contained  in its  Annual  Report  dated  October  31,  1996  are
incorporated  herein by  reference.  No other  parts of the  Annual  Report  are
incorporated by reference herein.

         The date of this Statement of Additional Information is June 8, 1998.


                                TABLE OF CONTENTS

General Information...........................................................
Pro Forma Financial Statements................................................


GENERAL INFORMATION

         The  Shareholders  of Cash  Reserve  are  being  asked  to  approve  or
disapprove  an  Agreement  and  Plan  of  Reorganization  (the   "Reorganization
Agreement")  dated as of _______,  1998 between the American Century  Investment
Trust and American Century Mutual Funds, Inc. and the transactions  contemplated
thereby. The Reorganization Agreement contemplates the transfer of substantially
all of the assets and  liabilities of Cash Reserve to Prime in exchange for full
and  fractional  shares  representing  interests in Prime.  The shares issued by
Prime will have an aggregate  net asset value equal to the  aggregate  net asset
value of the shares of Cash Reserve that are outstanding  immediately before the
effective time of the Reorganization.

         Following   the   exchange,   Cash  Reserve  will  make  a  liquidating
distribution of Prime shares to shareholders.  Each shareholder owning shares of
Cash Reserve at the effective time of the reorganization  will receive shares of
Prime of equal value,  plus the right to receive any unpaid  dividends that were
declared before the effective time of the reorganization on Cash Reserve shares.

         The Special  Meeting of  Shareholders  to consider  the  Reorganization
Agreement and the related  transactions  will be held at 10:00 a.m. Central time
on August 7, 1998 at American  Century  Tower I, 4500 Main Street,  Kansas City,
Missouri. For further information about the transaction,  see the Combined Proxy
Statement/Prospectus.

Pro Forma Combining
Benham Prime Money Market Fund and
Benham Cash Reserve Fund



Schedule of Investments

FEBRUARY 28, 1998
                                                            
Benham                                                   Benham
Prime      Benham                                        Prime      Benham
Money      Cash       Pro                                Money      Cash       Pro
Market     Reserve    Forma                              Market     Reserve    Forma
Fund       Fund       Combined                           Fund       Fund       Combined
Principal  Principal  Principal                          Market     Market     Market
Amount     Amount     Amount                             Value      Value      Value

COMMERCIAL PAPER(1)

BANKING--17.4%
$32,000,000        -- $32,000,000 Abbey National North
                                  America Corp.,
                                  5.43%-5.50%, 3/31/98-
                                  4/21/98                $31,816,109        -- $31,816,109
 20,500,000  6,675,000 27,175,000 Bank of Nova Scotia,
                                  5.43%-5.45%, 4/8/98-
                                  4/9/98                  20,380,836  6,636,953 27,017,789
 15,000,000  5,000,000 20,000,000 Bankers Trust New York
                                  Corp.,
                                  5.37%-5.60%, 4/16/98-
                                  7/15/98                 14,695,700  4,964,223 19,659,923
 20,000,000         -- 20,000,000 Banque Nationale de
                                  Paris (Canada),
                                  5.48%-5.73%, 3/9/98-
                                  4/13/98                 19,921,811         -- 19,921,811
 39,000,000         -- 39,000,000 BIL North America, Inc.,
                                  5.45%-5.46%, 3/25/98-
                                  5/13/98                 38,754,164         -- 38,754,164
         --  4,210,343  4,210,343 Chase Manhattan Bank
                                  USA, N.A.,
                                  5.40%, 5/26/98                  --  4,156,030  4,156,030
 10,000,000 10,000,000 20,000,000 Cofco Capital Corp.,
                                  5.75%, 3/5/98
                                  (LOC: Credit Suisse
                                  First Boston)            9,993,611  9,993,611 19,987,222
 57,290,000 38,500,000 95,790,000 Corporate Receivables
                                  Corp., 5.44%-5.53%,
                                  3/5/98-5/21/98 (LOC:
                                  Citibank, N.A.)
                                  (Acquired 1/6/98
                                  through 2/19/98,
                                  Cost $94,806,939)(2)    56,916,385 38,277,210 95,193,595
         -- 10,000,000 10,000,000 Demir Funding Corp. I,
                                  Series A, Tranche B,
                                  5.50%, 4/13/98 (LOC:
                                  Bayerische Vereinsbank
                                  A.G.)                           --  9,934,306  9,934,306
  7,000,000 10,000,000 17,000,000 Galicia Funding Corp.,
                                  Series B,
                                  5.78%, 3/4/98
                                  (LOC: Bayerische
                                  Vereinsbank A.G.)        6,996,628  9,995,184 16,991,812
 50,000,000 11,000,000 61,000,000 Garanti Funding Corporation,
                                  5.40%-5.58%, 3/4/98-7/27/98
                                  (LOC: Bayerische
                                  Vereinsbank A.G.)       49,477,953 10,927,016 60,404,969
 12,850,000         -- 12,850,000 IMI Funding Corp. (U.S.A.),
                                  5.75%, 3/2/98-3/18/98   12,833,381         -- 12,833,381
 12,000,000 45,000,000 57,000,000 National Australia
                                  Funding (Delaware), Inc.,
                                  5.41%-5.43%, 4/21/98-
                                  5/26/98                 11,907,690 44,567,658 56,475,348
  8,000,000         --  8,000,000 Pemex Capital, Inc.,
                                  5.58%, 4/22/98
                                  (LOC: Societe Generale)  7,935,520         --  7,935,520
 20,000,000         -- 20,000,000 Westdeutsche Landesbank
                                  Girozentrale,
                                  5.47%, 4/2/98           19,902,756         -- 19,902,756
                                                       ===================================
                                                       301,532,544 139,452,191 440,984,735
                                                       ===================================

BUILDING & HOME IMPROVEMENTS--0.4%
         -- 10,000,000 10,000,000 Cemex, S.A. de C.V.,
                                  5.46%, 5/14/98
                                  (LOC: Credit Suisse
                                   First Boston)                  --  9,887,767  9,887,767

COMMUNICATIONS SERVICES--0.9%
  5,000,000 19,000,000 24,000,000 Ameritech Capital
                                  Funding Corp.,
                                  5.43%, 4/10/98           4,969,834 18,885,367 23,855,201

DIVERSIFIED COMPANIES--3.5%
 44,000,000 45,000,000 89,000,000 Mitsubishi International Corp.,
                                  5.50%-5.65%, 4/20/98-
                                  5/20/98                 43,539,167 44,597,041 88,136,208

FINANCIAL SERVICES--21.7%
         -- 28,000,000 28,000,000 BT Alex. Brown Inc.,
                                  5.39%, 7/15/98-8/26/98          -- 27,297,169 27,297,169
  1,000,000         --  1,000,000 Charta Corporation,
                                  5.50%, 3/19/98 (AMBAC)
                                  (Acquired 2/13/98,
                                  Cost $994,806)(2)          997,250         --    997,250
 60,200,000 20,000,000 80,200,000 Dakota Certificates
                                  (Citibank),
                                  Series 1995-7,
                                  5.45%-5.75%, 3/3/98-
                                  5/18/98
                                  (Acquired 12/12/97
                                  through 2/18/98,
                                  Cost $79,188,045)(2)    59,876,826 19,903,950 79,780,776
 47,000,000 20,000,000 67,000,000 Ford Motor Credit Co.
                                  Puerto Rico, Inc.,
                                  5.45%-5.53%,
                                  4/9/98-5/15/98          46,635,558 19,877,111 66,512,669
         -- 10,000,000 10,000,000 Ford Motor Credit Co.,
                                  5.50%, 3/12/98                  --  9,983,195  9,983,195
 39,500,000  9,000,000 48,500,000 General Electric
                                  Capital Corp.,
                                  5.37%-5.68%,
                                  3/2/98-6/5/98           39,232,257  8,871,120 48,103,377
 24,000,000  8,000,000 32,000,000 General Electric
                                  Capital Services, Inc.,
                                  5.40%-5.47%,
                                  4/3/98-5/29/98          23,856,260  7,893,200 31,749,460
 45,000,000 42,000,000 87,000,000 General Electric
                                  Financial Assurance
                                  Holdings, 5.45%-5.49%,
                                  3/6/98-4/6/98           44,933,863 41,777,500 86,711,363
 24,100,000 46,000,000 70,100,000 General Motors
                                  Acceptance Corp.,
                                  5.46%-5.75%,
                                  3/10/98-7/31/98         23,944,485 45,364,663 69,309,148
         -- 23,500,000 23,500,000 Siemens Capital Corp.,
                                  5.50%, 6/19/98                  -- 23,105,070 23,105,070
 27,000,000         -- 27,000,000 Toyota Motor Credit Corp.,
                                  5.73%-5.77%,
                                  3/3/98-3/27/98          26,953,168         -- 26,953,168
 35,000,000 35,000,000 70,000,000 WCP Funding Inc.,
                                  5.43%-5.47%,
                                  4/7/98-4/24/98
                                  (AMBAC)
                                  (Acquired 1/15/98
                                  through
                                  2/5/98, Cost
                                  $69,252,813)(2)         34,778,429 34,826,861 69,605,290
         -- 10,000,000 10,000,000 Wachovia Corp., 5.48%,
                                  3/18/98                         --  9,974,122  9,974,122
                                                       ===================================
                                                       301,208,096 248,873,961 550,082,057
                                                       ===================================

HOUSEHOLD AUDIO & VIDEO--0.5%
 12,313,000         -- 12,313,000 Panasonic Finance
                                  America, 5.54%, 3/6/98
                                  (Acquired 10/9/97,
                                  Cost $12,032,565)(2)    12,303,525         -- 12,303,525
                                                         =================================
INSURANCE--2.7%
  9,400,000         --  9,400,000 American Family
                                  Financial Services, Inc.,
                                  5.47%, 3/5/98            9,394,287         --  9,394,287
  8,500,000 10,000,000 18,500,000 Prudential Funding
                                  Corp.,
                                  5.47%-5.50%,
                                  3/11/98-4/14/98          8,443,173  9,984,722 18,427,895
 20,000,000 20,000,000 40,000,000 SAFECO Corp., 5.47%-5.76%,
                                  3/12/98-4/15/98
                                  (Acquired 12/15/97-1/15/98,
                                  Cost $39,434,450)(2)    19,914,025 19,952,000 39,866,025
                                                          ================================
                                                          37,751,485 29,936,722 67,688,207
                                                          ================================

MACHINERY & EQUIPMENT--0.7%
         -- 16,600,000 16,600,000 Dover Corp., 5.47%,
                                  3/6/98 (Acquired
                                  1/22/98, Cost
                                  $16,491,641)(2)                 -- 16,587,400 16,587,400
                                                          ================================

METALS & MINING--0.8%
  9,000,000         --  9,000,000 RTZ America Inc.,
                                  5.53%, 3/20/98
                                  (Acquired 9/19/97,
                                  Cost $8,748,385)(2)      8,973,733         --  8,973,733
         -- 12,000,000 12,000,000 Rio Tinto America
                                  Inc., 5.46%, 5/15/98            -- 11,863,500 11,863,500
                                                           ===============================
                                                           8,973,733 11,863,500 20,837,233
                                                           ===============================

PETROLEUM REFINING--3.7%
 18,900,000 11,100,000 30,000,000 Chevron Transport Corp.,
                                  5.44%-5.50%,
                                  3/18/98-6/16/98         18,715,196 11,071,171 29,786,367
 40,000,000 23,000,000 63,000,000 Chevron U.K. Investment
                                  PLC,
                                  5.43%-5.75%,
                                  3/10/98-4/6/98          39,861,109 22,964,933 62,826,042
                                                          ================================
                                                          58,576,305 34,036,104 92,612,409
                                                          ================================

RETAIL--1.1%
 10,133,000 17,800,000 27,933,000 Southland Corp.,
                                  5.42%-5.48%, 3/23/98-
                                  8/18/98 (LOC: Ito-
                                  Yokado Co. Ltd.)        10,054,765 17,693,648 27,748,413
                                                          ================================

RUBBER & PLASTICS--1.4%
 15,000,000 20,000,000 35,000,000 Formosa Plastics
                                  Corp. USA,
                                  5.50%-5.54%,
                                  6/4/98-6/25/98
                                  (LOC: Bank of America
                                  N.T. & S.A.)            14,782,292 19,642,978 34,425,270
                                                          ================================

SECURITY BROKERS & DEALERS--11.2%
 10,000,000         -- 10,000,000 Bear Stearns Co., Inc.,
                                  5.46%, 5/13/98           9,889,283         --  9,889,283
 40,000,000 21,000,000 61,000,000 Credit Suisse First
                                  Boston, Inc.,
                                  5.41%-5.46%,
                                  4/22/98-5/19/98         39,623,977 20,793,505 60,417,482
 37,000,000 24,000,000 61,000,000 Goldman Sachs Group
                                  L.P.,
                                  5.42%-5.70%,
                                  4/15/98-5/14/98         36,604,707 23,796,871 60,401,578
 45,000,000 18,000,000 63,000,000 Merrill Lynch &
                                  Co., Inc.,
                                  5.46%-5.73%,
                                  3/9/98-7/31/98          44,436,373 17,958,150 62,394,523
 51,000,000 41,500,000 92,500,000 Morgan Stanley Dean
                                  Witter, Discover & Co.,
                                  5.40%-5.49%,
                                  4/17/98-7/29/98         50,332,075 41,038,946 91,371,021
                                                       ===================================
                                                       180,886,415 103,587,472 284,473,887
                                                       ===================================

SOVEREIGN GOVERNMENTS & AGENCIES--0.8%
         -- 20,000,000 20,000,000 Kingdom of Sweden,
                                  5.55%, 3/2/98                   -- 19,996,916 19,996,916
                                                       ===================================

UTILITIES--1.4%
 10,000,000 25,000,000 35,000,000 National Rural
                                  Utilities Cooperative
                                  Finance Corp., 5.45%-5.64%,
                                  3/13/98-4/24/98          9,931,875 24,926,973 34,858,848
                                                          ================================

TOTAL COMMERCIAL PAPER--68.2%                        984,510,036 739,968,040 1,724,478,076
                                                     =====================================
OTHER CORPORATE DEBT
 25,000,000 25,000,000 50,000,000 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 24,995,297 49,990,593
 20,000,000 20,000,000 40,000,000 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 20,000,000 40,000,000
 15,000,000         -- 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         -- 15,000,546
         -- 20,000,000 20,000,000 First Bank, N.A.,
                                  VRN, 5.59%, 6/17/98,
                                  resets monthly off the
                                  1-month LIBOR minus
                                  0.95% with no caps              -- 19,997,420 19,997,420
 50,000,000 40,000,000 90,000,000 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 $90,000,000)(2)    50,000,000 40,000,000 90,000,000
         -- 10,000,000 10,000,000 General American Life,
                                  VRN,  5.82%,  3/1/98,  
                                  resets monthly off the
                                  1-month LIBOR plus 0.20% 
                                  with no caps
                                  (Acquired 7/7/97,
                                  Cost $10,000,000)(2)            -- 10,000,000 10,000,000
 25,000,000         -- 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         -- 25,000,000
 15,000,000 12,000,000 27,000,000 Key  Bank  N.A., VRN,
                                  5.68%, 3/2/98, resets  
                                  daily off the Federal
                                  Funds rate plus 0.07% with
                                  no caps                 14,996,126 11,996,901 26,993,027
         -- 10,000,000 10,000,000 Merrill Lynch & Co., Inc.
                                  MTN, Series B,
                                  VRN, 5.84%, 4/15/98, resets
                                  quarterly off the 3-month
                                  LIBOR plus 0.25%
                                  with no caps                    -- 10,003,764 10,003,764
 47,000,000 47,000,000 94,000,000 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
                                  $94,000,000)(2)         47,000,000 47,000,000 94,000,000
 11,700,000 11,700,000 23,400,000 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
                                  $23,400,000)(2)         11,700,000 11,700,000 23,400,000
 23,500,000 23,500,000 47,000,000 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
                                  $47,000,000)(2)         23,500,000 23,500,000 47,000,000
         -- 15,000,000 15,000,000 U.S. Bank N.A.,
                                  Minnesota, VRN,
                                  5.49%, 3/18/98, resets monthly
                                  off the 1-month LIBOR minus
                                  0.13% with no caps              -- 14,994,314 14,994,314
                                                          ================================

TOTAL OTHER CORPORATE DEBT--18.4%                      232,191,968 234,187,696 466,379,664
                                                       ===================================

ASSET-BACKED SECURITIES

 23,500,000 23,500,000 47,000,000 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 $47,000,000)(2)    23,500,000 23,500,000 47,000,000
  5,903,334  5,903,334 11,806,668 Americredit Automobile
                                  Receivables Trust,
                                  Series 1997 C, Class A1,
                                  5.66%, 9/5/98 (FSA)      5,903,334  5,903,334 11,806,668
  7,349,378  7,349,378 14,698,756 Americredit Automobile
                                  Receivables Trust,
                                  Series 1997 D, Class A1,
                                  5.80%, 11/5/98 (FSA)     7,349,378  7,349,378 14,698,756
  3,251,427  3,251,427  6,502,854 Barnett Auto Trust,
                                  Series 1997 A,
                                  Class A1, 5.65%,
                                  10/15/98
                                  (Acquired 9/18/97,
                                  Cost $6,502,854)(2)      3,251,427  3,251,427  6,502,854
 10,315,769 10,315,769 20,631,538 Capital Equipment
                                  Receivables Trust,
                                  Series 1997-1, Class A1,
                                  5.79%, 12/15/98         10,315,769 10,315,769 20,631,538
 11,000,000  9,000,000 20,000,000 Chase Manhattan
                                  Auto Owner Trust,
                                  Series 1998 A, Class A1,
                                  5.55%, 3/12/99          11,000,000  9,000,000 20,000,000
  5,245,042  5,245,042 10,490,084 Ford Credit Auto
                                  Owner Trust,
                                  Series 1997 B,
                                  Class A1, 5.75%,
                                  10/15/98                 5,245,042  5,245,042 10,490,084
 20,000,000 20,000,000 40,000,000 Ford Credit Auto
                                  Owner Trust,
                                  Series 1998 A,
                                  Class A1, 5.55%,
                                  2/15/99                 20,000,000 20,000,000 40,000,000
 14,000,000 15,000,000 29,000,000 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 West-
                                  minster Bank PLC)
                                  (Acquired 8/29/97,
                                  Cost $29,000,000)(2)    14,000,000 15,000,000 29,000,000
                                                          ================================
TOTAL ASSET-BACKED SECURITIES--7.9%                     100,564,950 99,564,950 200,129,900
                                                        ==================================

CERTIFICATES OF DEPOSIT

         -- 10,000,000 10,000,000 Caisse Nationale de
                                  Credit Agricole,
                                  5.90%, 8/11/98                  -- 10,000,000 10,000,000
 10,000,000         -- 10,000,000 Chase Manhattan Corp.
                                  5.56%, 7/7/98           10,000,000         -- 10,000,000
 20,000,000 10,000,000 30,000,000 Bayerische Landesbank
                                  Girozentrale,
                                  5.66%, 2/22/99          20,000,000 10,000,000 30,000,000
         --  5,000,000  5,000,000 National Westminster
                                  Bank PLC,
                                  5.86%, 3/10/98                  --  4,999,957  4,999,957
 13,000,000         -- 13,000,000 Rabobank Nederland,
                                  5.43%-5.99%,
                                  3/24/98-1/12/99         12,980,541         -- 12,980,541
 14,000,000 11,000,000 25,000,000 Royal Bank of
                                  Canada - New York,
                                  5.55%, 2/11/99          13,992,167 10,993,845 24,986,012
                                                         =================================

TOTAL CERTIFICATES OF DEPOSIT--3.7%                       56,972,708 35,993,802 92,966,510
                                                         =================================

BANK NOTES--1.8%

 35,000,000 17,675,000 52,675,000 BankBoston Corp.,
                                  5.59%-5.83%, 4/9/98-
                                  7/8/98                  35,000,000 11,000,000 46,000,000
                                                         =================================

TOTAL INVESTMENT SECURITIES--100.0%           $1,409,239,662 $1,120,714,488 $2,529,954,150
                                              ============================================

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 are 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
       $670,210,448, which represented 26.4% of net assets.

See Notes to Financial Statements




BENHAM PRIME MONEY MARKET FUND
BENHAM CASH RESERVE FUND
PRO FORMA COMBINING STATEMENT OF ASSETS AND LIABILITIES
February 28, 1998 (Unaudited)

                            Benham
                             Prime           Benham                             Pro
                             Money            Cash                             Forma
                            Market           Reserve                          Combined
                             Fund             Fund          Adjustments       (Note 1)

ASSETS
Investment securities,
   at amortized cost..  $1,409,239,662   $1,120,714,488                    $2,529,954,150
Cash .................      12,464,116        6,500,771                        18,964,887
Receivable for
capital shares sold...               0            1,371                             1,371
Interest receivable...       1,906,726        1,780,442                         3,687,168
- ------------------------------------------------------------------------------------------
                         1,423,610,504    1,128,997,072                0    2,552,607,576
- ------------------------------------------------------------------------------------------

LIABILITIES
Disbursements in excess
  of demand deposit cash..   4,193,481                0                         4,193,481
Payable for investments
  Purchased ..............           0                0                                 0
Payable for capital
  shares redeemed.........   1,365,778        9,422,160                        10,787,938
Dividends payable ........     195,084          159,044                           354,128
Accrued management fee ...     543,835          436,185          196,225(1)     1,176,245
Payable for distribution fee.....    0              562                0              562
Payable for shareholder
  service fee....................    0              562                0              562
Accrued expenses and other
  liabilities....................1,639            3,536                0            5,175
                             ---------       ----------          -------       ----------
                             6,299,817       10,022,049          196,225       16,518,091
                             ---------       ----------          -------       ----------

Net Assets Applicable
  to Outstanding
  Shares ............   $1,417,310,687   $1,118,975,023        ($196,225)  $2,536,089,485
==========================================================================================

CAPITAL SHARES (NOTE 3)
Outstanding..........    1,417,565,184    1,119,059,421                     2,536,624,605
==========================================================================================

Net Asset Value Per Share...     $1.00            $1.00                             $1.00
==========================================================================================

NET ASSETS CONSIST OF:
Capital paid in........ $1,417,565,184   $1,119,060,177        ($196,225)   2,536,429,136
Undistributed net
  investment loss..........         --             (849)                             (849)
Accumulated undistributed
  net realized gain (loss)
  from investment
  transactions ............   (254,497)         (84,305)                         (338,802)
- ------------------------------------------------------------------------------------------

                        $1,417,310,687   $1,118,975,023        ($196,225)  $2,536,089,485
==========================================================================================

Investor Class
Net assets ..........   $1,417,310,687              N/A   $1,115,853,130(2)$2,533,163,817
Shares outstanding
  (Note 3) ..........    1,417,565,184              N/A    1,116,133,749(2) 2,533,698,933
Net asset value
  per share .........            $1.00              N/A                             $1.00
Par value ...........              N/A              N/A                               N/A

Advisor Class
Net assets ..........              N/A              N/A       $2,925,668(2)    $2,925,668
Shares outstanding (Note 3)...     N/A              N/A        2,925,668(2)     2,925,668
Net asset value per share.....     N/A              N/A                             $1.00
Par value ...........              N/A              N/A                             $0.01

Investor Class
Net assets ..........              N/A   $1,116,049,355  ($1,116,049,355)(2)           $0
Shares outstanding (Note 3)...     N/A    1,116,133,749   (1,116,133,749)(2)            0
Net asset value per share.....     N/A            $1.00                               N/A
Par value ...........              N/A              N/A                               N/A

Advisor Class
Net assets ..........              N/A       $2,925,668      ($2,925,668)(2)           $0
Shares outstanding (Note 3)...     N/A        2,925,672       (2,925,672)(2)            0
Net asset value per share ....     N/A            $1.00            $1.00              N/A
Par value ...........              N/A              N/A              N/A              N/A


(1)  Adjustment  restates  Prime Money  Market Fund accrued  management  fees to
     reflect the unitary fee  structure of the proposed  reorganized  entity and
     the discontinuance of Prime's voluntary fee waiver.

(2)  Adjustment  to reflect the  issuance of Prime shares in exchange for shares
     of Cash  Reserve.  Also,  includes  adjustment  to reflect  the  additional
     management fee accrual to the Investor Class.

See Notes to Pro Forma Financial Statements






BENHAM PRIME MONEY MARKET FUND
BENHAM CASH RESERVE FUND
PRO FORMA COMBINING STATEMENT OF OPERATIONS

                            Benham
                             Prime           Benham                             Pro
                             Money            Cash                             Forma
                            Market           Reserve                          Combined
                             Fund             Fund          Adjustments       (Note 1)
- ---------------------------------($ in Thousands)----------------------------------------
INVESTMENT INCOME
Income:
Interest ................  $73,727,790      $68,655,938               $0     $142,383,728

Expenses:
Management fees.............                  7,739,363        7,285,652 (1)   15,025,015
Investment advisory fees ... 6,282,235               --       (6,282,235)(1)            0
Transfer agency
  fees......................   765,989               --         (765,989)(1)            0
Administrative
  fees......................   476,721               --         (476,721)(1)            0
Printing and postage.........  255,358               --         (255,358)(1)            0
Custodian fees...............   92,513               --          (92,513)(1)            0
Trustees' fees and
  expenses...................   66,163           11,349          (11,349)(1)       66,163
Registration and
  filing fees................   52,224               --          (52,224)(1)            0
Auditing and legal
  fees.......................   23,907               --          (23,907)(1)            0
Distribution fee
  --Advisor Class............                     2,153                0            2,153
Shareholder service fees
  --Advisor Class............                     2,153                0            2,153
Other operating
  expenses...................   79,339               --          (79,339)(1)            0
  Total expenses.............8,094,449        7,755,018         (753,983)      15,095,484
- ------------------------------------------------------------------------------------------
Amount waived...............(1,590,729)         (87,349)       1,678,078 (1)            0
- ------------------------------------------------------------------------------------------
  Net expenses.............. 6,503,720        7,667,669          924,095       15,095,484
- ------------------------------------------------------------------------------------------
Net investment income.......67,224,070       60,988,269         (924,095)     127,288,244
- ------------------------------------------------------------------------------------------

REALIZED AND UNREALIZED
GAIN (LOSS) ON INVESTMENTS

Net realized gain (loss)........                 (4,990)
- ------------------------------------------------------------------------------------------
Change in net unrealized
  appreciation (depreciation) ..                     --
- ------------------------------------------------------------------------------------------
Net realized and
  unrealized gain
  (loss) on investments ........     0           (4,990)               0                0
- ------------------------------------------------------------------------------------------
Net Increase in Net
  Assets Resulting from
  Operations............   $67,224,070      $60,983,279        ($924,095)    $127,288,244
==========================================================================================

(1) Adjustment restates the management fee to reflect the combined net assets of
the Prime and Cash Reserve Funds and the expiration of Prime's fee waiver.  Note
that Prime implemented the unified fee structure on August 1, 1997.

Notes to Pro Forma Financial Statements (unaudited)

1.   Basis  of  Combination-The   unaudited  Pro  Forma  Combining  Schedule  of
     Investments,  Pro Forma  Combining  Statement of Assets and Liabilities and
     Pro Forma  Combining  Statement of  Operations  reflect the accounts of the
     American  Century - Benham Prime Money  Market Fund and American  Century -
     Benham Cash Reserve Fund, at and for the year ended February 28, 1998.

     The pro forma statements give effect to the proposed transfer of the assets
     and stated liabilities of the non-surviving fund, American Century - Benham
     Cash Reserve Fund, in exchange for shares of the surviving entity, American
     Century - Benham Prime Money Market Fund.

     In accordance with generally accepted accounting principles, the historical
     cost of investment securities will be carried forward to the surviving fund
     and the results of operations for pre-combination periods for the surviving
     fund will not be  restated.  The pro forma  statements  do not  reflect the
     expenses of either fund in carrying out its obligation  under the Agreement
     and Plan of Reorganization.  Under the terms of the Plan of Reorganization,
     the  combination  of the  funds  will be  treated  as a  tax-free  business
     combination and accordingly will be accounted for by a method of accounting
     for tax-free mergers of investment  companies (sometimes referred to as the
     pooling without restatement method).

     The Pro Forma Combining  Schedule of  Investments,  Statement of Assets and
     Liabilities and Statement of Operations  should be read in conjunction with
     the historical  financial  statements of the funds included or incorporated
     by reference in the Statement of Additional Information.

2.   Portfolio   Valuation-Securities   are  valued  at  amortized  cost,  which
     approximates  current value.  When  valuations  are not readily  available,
     securities  are  valued at fair  value as  determined  in  accordance  with
     procedures adopted by the Board of Directors.

3.   Capital Shares-The pro forma net asset value per share assumes the issuance
     of shares of the  surviving  fund which  would have been issued at February
     28, 1998, in  connection  with the proposed  reorganization.  The number of
     shares  assumed  to be issued is equal to the net asset  value of shares of
     the non-surviving  fund, as of February 28, 1998,  divided by the net asset
     value per share of the  shares of the  surviving  fund as of  February  28,
     1998.  The pro forma total  number of shares  outstanding  for the combined
     fund consists of the following at February 28, 1998:

                                                        Additional Shares
    Combined     Total Outstanding      Shares of        Assumed Issued
      Fund             Shares         Surviving Fund    in Reorganization
      ----             ------         --------------    -----------------
Benham Prime
  Money Market     2,533,698,933      1,417,565,184      1,116,133,749


PART C   OTHER INFORMATION


Item 15  Indemnification

         As  stated  in  Article  VII,  Section 3 of the  Amended  and  Restated
         Declaration of Trust,  incorporated herein by reference to Exhibit 1 to
         the  Registration  Statement,  "The  Trustees  shall  be  entitled  and
         empowered to the fullest extent permitted by law to purchase  insurance
         for and to provide by resolution  or in the Bylaws for  indemnification
         out of Trust  assets  for  liability  and for all  expenses  reasonably
         incurred  or paid or  expected  to be paid by a Trustee  of  officer in
         connection with any claim,  action,  suit, or proceeding in which he or
         she  becomes  involved  by  virtue  of his or her  capacity  or  former
         capacity with the Trust.  The provisions,  including any exceptions and
         limitations concerning  indemnification,  may be set forth in detail in
         the Bylaws or in a resolution adopted by the Board of Trustees."

         Registrant hereby incorporates by reference,  as though set forth fully
         herein,  Section  7 of the  Distribution  Agreement,  to  Exhibit  6 of
         Post-Effective  Amendment  No.  28 to  the  Registration  Statement  of
         American Century Target Maturities Trust filed on January 30, 1998.

         Registrant hereby incorporates by reference,  as though set forth fully
         herein,  Article  VI of the  Registrant's  Bylaws,  amended on March 9,
         1998, appearing as Exhibit 2 to Post-Effective  Amendment No. 23 to the
         Registration  Statement of American  Century  Municipal  Trust filed on
         March 26, 1998.


Item 16  Exhibits

          (1)  (a) Amended and  Restated  Declaration  of Trust,  dated June 16,
               1993  and  amended  May  31,  1995,  is  incorporated  herein  by
               reference to Exhibit 1 of Post-Effective Amendment No. 3 filed on
               April 24, 1996.

               (b) Amendment to the Declaration of Trust dated October 21, 1996,
               is   incorporated   herein  by   reference   to   Exhibit  1b  of
               Post-Effective Amendment No. 5 filed on June 27, 1997.

          (2)  Amended  and   Restated   Bylaws,   dated  March  9,  1998,   are
               incorporated  herein by reference to Exhibit 2 of  Post-Effective
               Amendment  No.  23 to  the  Registration  Statement  of  American
               Century Municipal Trust filed on March 26, 1998.

          (3)  Not applicable.

          (4)  Agreement and Plan of Reorganization is filed herein.

          (5)  Not applicable.

          (6)  (a)  Management  Agreement  -  Investor  Class  between  American
               Century   Investment  Trust  and  American   Century   Investment
               Management, Inc., dated August 1, 1997, is incorporated herein by
               reference to Exhibit 5a of Post-Effective Amendment No. 33 to the
               Registration  Statement  of American  Century  Government  Income
               Trust, filed on July 31, 1997.

               (b) Management Agreement - Advisor Class between American Century
               Investment  Trust and  American  Century  Investment  Management,
               Inc.,  dated August 1, 1997, is incorporated  herein by reference
               to  Exhibit  5b  of  Post-Effective   Amendment  No.  27  to  the
               Registration  Statement  of American  Century  Target  Maturities
               Trust, filed on August 28, 1997.

          (7)  Distribution  Agreement between American Century Investment Trust
               and  Funds   Distributor,   Inc.,  dated  January  15,  1998,  is
               incorporated  herein by reference to Exhibit 6 of  Post-Effective
               Amendment  No.  28 to  the  Registration  Statement  of  American
               Century Target Maturities Trust, filed on January 30, 1998.

          (8)  Not applicable.

          (9)  Global Custody Agreement between The Chase Manhattan Bank and the
               Twentieth  Century and Benham  funds,  dated  August 9, 1996,  is
               incorporated  herein by reference to Exhibit 8 to  Post-Effective
               Amendment  No. 31 of American  Century  Government  Income  Trust
               filed on February 7, 1997.

          (10) (a) Master Distribution and Shareholder Services Plan of American
               Century Government Income Trust,  American Century  International
               Bond Fund,  American Century Target Maturities Trust and American
               Century Quantitative Equity Funds (Advisor Class) dated August 1,
               1997,  is  incorporated  herein by  reference  to  Exhibit  15 of
               Post-Effective  Amendment No. 27 to the Registration Statement of
               American  Century  Target  Maturities  Trust  filed on August 28,
               1997.

               (b) Multiple Class Plan of American Century  California  Tax-Free
               and Municipal Funds,  American Century  Government  Income Trust,
               American  Century  International  Bond  Funds,  American  Century
               Investment  Trust,  American Century  Municipal  Trust,  American
               Century Target Maturities Trust and American Century Quantitative
               Equity  Funds dated  August 1, 1997,  is  incorporated  herein by
               reference to Exhibit 18 of Post-Effective Amendment No. 27 to the
               Registration  Statement  of American  Century  Target  Maturities
               Trust, filed on August 28, 1997.

          (11) Opinion  and  Consent  of  Counsel  as to  the  legality  of  the
               securities being registered is filed herein.

          (12) Opinion  and  Consent  of  Counsel  as to  the  tax  matters  and
               consequences to shareholders (to be filed by amendment).

          (13) Transfer Agency  Agreeement  between American Century  Investment
               Trust and American Century Services  Corporation  dated August 1,
               1997,  is  incorporated  herein  by  reference  to  Exhibit  9 of
               Post-Effective  Amendment No. 33 to the Registration Statement of
               American Century Government Income Trust filed on July 31, 1997.

          (14) (a) Consent of Deloitte & Touche LLP is filed herein.

               (b) Consent of Coopers & Lybrand is filed herein.

               (c)  Consent  of  Baird,   Kurtz  and  Dobson  (to  be  filed  by
               amendment).

               (d) Consent of KPMG Peat Marwick (to be filed by amendment).

          (15) Not applicable.

          (16) Power of Attorney dated January 15, 1998 is filed herein.

          (17) (a) Form of Proxy is filed herein.

               (b) Prospectus dated March 1, 1998, for American Century - Benham
               Cash Reserve Fund filed as part of  Post-Effective  Amendment No.
               78 to the  Registration  Statement  of  American  Century  Mutual
               Funds,  Inc. on February  26,  1998,  is  incorporated  herein by
               reference.

               (c) Statement of Additional  Information dated March 1, 1998, for
               American  Century - Benham  Cash  Reserve  Fund  filed as part of
               Post-Effective  Amendment No. 78 to the Registration Statement of
               American  Century  Mutual  Funds,  Inc. on February 26, 1998,  is
               incorporated herein by reference.

               (d) Prospectus  dated July 1, 1997, for American Century - Benham
               Prime  Money  Market  Fund  filed  as a  part  of  Post-Effective
               Amendment No. 5 to the Registration Statement of American Century
               Investment  Trust on June 27,  1997,  is  incorporated  herein by
               reference.

               (e)  Statement  of  Additional  Information  dated  July 1, 1997,
               revised August 1, 1997, for American Century - Benham Prime Money
               Market Fund filed  pursuant to Rule 497(e) on July 30,  1997,  is
               incorporated herein by reference.

               (f) Annual Report dated October 31, 1997, for American  Century -
               Benham  Cash  Reserve  Fund  filed  on  December  29,  1997,   is
               incorporated herein by reference.

               (g) Annual Report dated October 31, 1996, for American  Century -
               Benham  Cash  Reserve  Fund  filed  on  December  23,  1996,   is
               incorporated herein by reference.

               (h) Annual Report dated February 28, 1997, for American Century -
               Benham  Prime  Money  Market  Fund  filed on April 23,  1997,  is
               incorporated herein by reference.

               (i) Semiannual Report dated August 31, 1997, for American Century
               - Benham Prime Money  Market Fund filed on October 29,  1997,  is
               incorporated herein by reference.


Item 17  Undertakings

          (a)  The  undersigned  Registrant  agrees  that  prior  to any  public
               reoffering  of the  securities  registered  through  the use of a
               prospectus which is a part of this registration  statement by any
               person or party who is deemed  to be an  underwriter  within  the
               meaning of Rule 145(c) of the Securities Act of 1933, as amended,
               the reoffering prospectus will contain the information called for
               by the applicable  registration  form for  reofferings by persons
               who may be deemed  underwriters,  in addition to the  information
               called for by the other items of the applicable form.

          (b)  The undersigned  Registrant  agrees that every prospectus that is
               filed  under  paragraph  (1) above  will be filed as a part of an
               amendment  to the  registration  statement  and  will not be used
               until the amendment is effective,  and that, in  determining  any
               liability under the 1933 Act, each post-effective amendment shall
               be deemed to be a new  registration  statement for the securities
               offered therein,  and the offering of the securities at that time
               shall be deemed to be the initial bona fide offering of them.

          (c)  Insofar  as  indemnification  for  liability  arising  under  the
               Securities  Act of 1933 may be permitted to  directors,  officers
               and  controlling  persons  of  the  registrant  pursuant  to  the
               foregoing  provisions,  or  otherwise,  the  registrant  has been
               advised  that  in the  opinion  of the  Securities  and  Exchange
               Commission  such  indemnification  is  against  public  policy as
               expressed  in the Act and is,  therefore,  unenforceable.  In the
               event that a claim for  indemnification  against such liabilities
               (other than the payment by the registrant of expenses incurred or
               paid  by  a  director,  officer  or  controlling  person  of  the
               registrant  in the  successful  defense  of any  action,  suit or
               proceeding) is asserted by such director,  officer or controlling
               person in connection with the securities  being  registered,  the
               registrant will,  unless in the opinion of its counsel the matter
               has been settled by controlling  precedent,  submit to a court of
               appropriate    jurisdiction    the    question    whether    such
               indemnification  by it is against  public  policy as expressed in
               the Act and will be  governed by the final  adjudication  of such
               issue.

                                   SIGNATURES

As  required  by the  Securities  Act of 1933,  as  amended,  this  Registration
Statement  has been  signed on behalf of the  Registrant,  in the City of Kansas
City, State of Missouri, on the 17th day of April, 1998.

                            AMERICAN CENTURY INVESTMENT TRUST (Registrant)

                            By: /s/ Patrick A. Looby
                                Patrick A. Looby
                                Vice President

As  required  by the  Securities  Act of 1933,  as  amended,  this  Registration
Statement has been signed by the following  persons in the capacities and on the
dates indicated.


                                                                      Date
                                                                      
*Richard W. Ingram                   President, Principal        April 17, 1998
- ---------------------------------    Executive and Principal
Richard W. Ingram                    Financial Officer

*Maryanne Roepke                     Vice President, Treasurer   April 17, 1998
- ---------------------------------    and Principal Accounting
Maryanne Roepke                      Officer

*Albert A. Eisenstat                 Director                    April 17, 1998
- ---------------------------------
Albert A. Eisenstat

*Ronald J. Gilson                    Director                    April 17, 1998
- ---------------------------------
Ronald J. Gilson

*William M. Lyons                    Director                    April 17, 1998
- ---------------------------------
William M. Lyons

*Myron S. Scholes                    Director                    April 17, 1998
- ---------------------------------
Myron S. Scholes

*Kenneth E. Scott                    Director                    April 17, 1998
- ---------------------------------
Kenneth E. Scott

*Isaac Stein                         Director                    April 17, 1998
- ---------------------------------
Isaac Stein

*James E. Stowers III                Director                    April 17, 1998
- ---------------------------------
James E. Stowers III

*Jeanne D. Wohlers                   Director                    April 17, 1998
- ---------------------------------
Jeanne D. Wohlers


*By /s/ Patrick A. Looby
     Patrick A. Looby
     Attorney-in-Fact