AMERICAN CENTURY QUANTITATIVE EQUITY FUNDS
497K3B, 1999-04-16
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[front cover]

AMERICAN CENTURY

Fund Profile

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

Income & Growth Fund

This profile  summarizes key information  about the fund that is included in the
fund's Prospectus.  The fund's Prospectus includes additional  information about
the fund,  including a more detailed  description of the risks  associated  with
investing in the fund, that you may want to consider before you invest.

[photos of woman and girls blowing bubbles, men talking, woman at computer]

                                                                  APRIL 25, 1999
                                                                  INVESTOR CLASS

You may obtain the Prospectus and other information about the fund at no cost by
calling us at  1-800-345-2021,  accessing  our Web site or  visiting  one of our
Investor  Centers.  See the back cover for additional  telephone numbers and our
address.




INCOME & GROWTH FUND

1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

    Income  &  Growth  seeks  dividend   growth,   current  income  and  capital
    appreciation by investing in common stocks.

2. WHAT IS THE FUND'S INVESTMENT STRATEGY?

    The fund's investment strategy utilizes  quantitative  management techniques
    in a two-step  process  that draws  heavily on computer  technology.  In the
    first step,  the fund  managers  rank stocks,  primarily  the 1,500  largest
    publicly  traded  companies in the United  States  (measured by the value of
    their stock),  from most attractive to least attractive.  This is determined
    by using a computer model that combines  measures of a stock's value as well
    as measures of its growth potential. To measure value, the fund managers use
    ratios of stock  price-to-book  value and stock  price-to-cash  flow,  among
    others. To measure growth,  the fund managers use, among others, the rate of
    growth of a company's  earnings and changes in the earnings  estimates for a
    company.

    In the second  step,  the fund  managers  use a technique  called  portfolio
    optimization.  With portfolio optimization, the fund managers use a computer
    model to build a portfolio  of stocks  that they  believe  will  provide the
    optimal  balance  between  risk and  expected  return  of the  portfolio  as
    measured in the stock  ranking  completed in the first step.  The goal is to
    create a fund that provides  better  returns than the S&P 500 without taking
    on significant additional risk. When building the fund's portfolio, the fund
    managers  also attempt to create a dividend  yield for the fund that will be
    greater than that of the S&P 500.

    The fund may invest in  securities  other than stocks,  such as  convertible
    securities,  foreign  securities,  short-term  instruments and non-leveraged
    stock index futures contracts.  "Non-leveraged"  means that the fund may not
    invest in futures contracts where it would be possible to lose more than the
    fund invested.

    Additional  information about Income & Growth's  investments is available in
    its  annual  and  semiannual  reports.  In these  reports  you  will  find a
    discussion  of  the  market   conditions  and  investment   strategies  that
    significantly  affected the fund's performance during the most recent fiscal
    period. You may get these reports at no cost by calling us.

3. WHAT ARE THE SIGNIFICANT RISKS OF INVESTING IN THE FUND?

    * The value of Income & Growth's  shares  depends on the value of the stocks
    and other  securities it owns. The value of the individual  securities  that
    the  fund  owns  will go up and down  depending  on the  performance  of the
    companies  that issued them,  general  market and economic  conditions,  and
    investor confidence.

    * Market  performance  tends to be  cyclical  and,  in the  various  cycles,
    certain investment styles may fall in and out of favor. If the market is not
    favoring  the fund's  style,  the fund's  gains may not be as big as, or its
    losses may be bigger than,  other equity  funds using  different  investment
    styles.

    * As with all funds,  at any given time the value of your shares of Income &
    Growth may be worth  more or less than the price you paid.  If you sell your
    shares when the value is less than the price you paid, you will lose money.

    * An investment in the fund is not a bank deposit,  and it is not insured or
    guaranteed by the Federal Deposit Insurance  Corporation (FDIC) or any other
    government agency.

    * Although  the fund  managers  invest the fund's  assets  primarily in U.S.
    stocks,  Income & Growth can  invest in  securities  of  foreign  companies.
    Foreign securities can have certain unique risks,  including fluctuations in
    currency exchange rates, unstable political and economic structures, reduced
    availability  of  public  information,  and the  lack of  uniform  financial
    reporting and regulatory practices similar to those that apply to U.S.
    issuers.

    In summary,  Income and Growth is intended for  investors  who seek dividend
    growth,  current income and capital  appreciation through an equity fund and
    who are willing to accept the risks  associated  with the fund's  investment
    strategy.

    FUND PERFORMANCE

    The  following bar chart shows the actual  performance  of Income & Growth's
    Investor  Class shares for each calendar year since the fund's  inception on
    December 17, 1990.  The bar chart  indicates  the  volatility  of the fund's
    historical  returns  from  year to  year.  The  bar  chart  and  performance
    information  below are not intended to indicate how the fund will perform in
    the future.


Income & Growth                               American Century Investments




[data shown in bar chart]
    Calendar Year-By-Year Returns (1)
          1998           27.67%
          1997           34.52%
          1996           24.15%
          1995           36.88%
          1994           -0.55%
          1993           11.31%
          1992            7.86%
          1991           39.08%

          (1 )As of March 31, 1999, the end of the most recent calendar quarter,
          Income & Growth's year-to-date return was 1.91%.

    The highest and lowest quarterly returns for the period reflected in the bar
    chart are:

                              Highest                 Lowest
    Income & Growth           22.18% (4Q 1998)        -11.29% (3Q 1998)

    The following  table shows the average annual return of the fund's  Investor
    Class  shares for the periods  indicated.  The S&P 500 Index,  an  unmanaged
    index that  reflects no  operating  costs,  is  included as a benchmark  for
    performance comparisons.

                       1 YEAR     5 YEARS   LIFE OF FUND(1)
AVERAGE ANNUAL TOTAL RETURNS (PERIOD ENDED MARCH 31, 1999)
    Income & Growth     12.95%     25.35%      21.44%
    S&P 500 Index       18.42%     26.19%      21.02%

        (1) The inception date for Income & Growth is December 17, 1990.

4. WHAT ARE THE FUND'S FEES AND EXPENSES?

    There are no sales loads, fees or other charges

    * to buy fund shares directly from American Century

    * to reinvest dividends in additional shares

    * to exchange into the Investor Class shares of other American Century fund

    * to redeem your shares

    The following table describes the fees and expenses that you will pay if you
    buy and hold shares of the fund.

     ANNUAL FUND OPERATING EXPENSES
     (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)
               Management Fee                                0.69%(1)
               Distribution and Service (12b-1) Fees         None
               Other Expenses(2)                             0.00%
               Total Annual Fund Operating Expenses          0.69%


        (1) Based on expenses  incurred  during the fund's  most  recent  fiscal
        year.  The fund has a stepped  fee  schedule.  As a result,  the  fund's
        management fee rate generally decreases as fund assets increase.

        (2) Other  expenses,  which  include the fees and expenses of the fund's
        independent directors,  their legal counsel,  interest and extraordinary
        expenses,  are  expected to be less than  0.005% for the current  fiscal
        year.

           EXAMPLE
             Assuming you . . .
             * invest $10,000 in the fund
             * redeem all of your shares at the end of the periods shown below
             * earn a 5% return each year
             * incur the same operating expenses as shown above
             . . . your cost of investing in the fund would be:

             1 year       3 years       5 years       10 years
              $70          $220          $383           $856

             Of course, actual costs may be higher or lower. Use this example to
             compare the costs of investing in other funds.

5. WHO ARE THE FUND'S INVESTMENT ADVISOR AND PORTFOLIO MANAGERS?

    American Century Investment  Management,  Inc. provides  investment advisory
    and  management  services  for the  fund.  American  Century  uses  teams of
    portfolio  managers,  assistant  portfolio  managers  and  analysts  working
    together to manage its mutual funds. The portfolio  managers on the Income &
    Growth team are identified as follows:

    JOHN  SCHNIEDWIND,  Senior  Vice  President  and Group  Leader--Quantitative
    Equity, has been a member of the team that manages Income & Growth since its
    inception.  Mr.  Schniedwind  joined  American  Century  in  1982  and  also
    supervises  other  portfolio  management  teams.  He has degrees from Purdue
    University and an MBA in finance from the University of California.  He is a
    Chartered Financial Analyst.


Fund Profile                                                Income & Growth




    JEFFREY R. TYLER,  Senior Vice President and Portfolio  Manager,  has been a
    member of the team that manages  Income & Growth since June 1997.  He joined
    American Century as a Portfolio  Manager in 1988. He has a bachelor's degree
    in  business  economics  from the  University  of  California  and an MBA in
    finance  and  economics  from  Northwestern  University.  He is a  Chartered
    Financial Analyst.

6. HOW DO I BUY FUND SHARES?

    *  Complete and return the enclosed application

    *  Call us and exchange shares from another American Century fund

    *  Call us and send your investment by bank wire transfer

    Your  initial  investment  must be at least $2,500  ($1,000 for  traditional
    IRAs,  Roth IRAs and UGMA/UTMA  accounts)  unless you establish an automatic
    investment  plan of at least  $50 per  month.  If your  redemption  activity
    causes the value of your  account to fall below this account  minimum,  your
    shares may be redeemed involuntarily.

7. HOW DO I SELL FUND SHARES?

    You may sell all or part of your fund shares on any  business day by writing
    or calling  us.  You also may  exchange  your  shares in Income & Growth for
    shares  in  nearly  70 other  mutual  funds  offered  by  American  Century.
    Depending  on the  options  you  select  when you open  your  account,  some
    restrictions  may  apply.  For your  protection,  some  redemption  requests
    require a signature guarantee.

8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED?

    Income  & Growth  pays  distributions  of  substantially  all of its  income
    quarterly.  Distributions from realized capital gains are paid twice a year,
    usually in March and  December.  Distributions  may be  taxable as  ordinary
    income,  capital gains or a combination of the two.  Capital gains are taxed
    at  different  rates  depending  on the  length  of time the  fund  held the
    securities that were sold.  Distributions  are reinvested  automatically  in
    additional shares unless you choose another option.

9. WHAT SERVICES ARE AVAILABLE?

    American Century offers several ways to make it easier for you to manage
    your account, such as

    * telephone transactions 
    * wire and electronic funds transfers 
    * 24-hour Automated Information Line transactions 
    * 24-hour online Internet account access and transactions

    You will find more information  about these choices in our Investor Services
    Guide,  which you may  request  by  calling  us,  accessing  our Web site or
    visiting one of our Investor Centers.

    Information   contained  in  our  Investor   Services   Guide   pertains  to
    shareholders  who invest directly with American  Century rather than through
    an employer-sponsored retirement plan or financial intermediary.

    If  you  own  or  are   considering   purchasing   fund  shares  through  an
    employer-sponsored  retirement plan or financial intermediary,  your ability
    to purchase  shares of the fund,  exchange them for shares of other American
    Century  funds,  and  redeem  them will  depend on the terms of your plan or
    financial  intermediary.  If  you  have  questions  about  investing  in  an
    employer-sponsored retirement plan or through a financial intermediary, call
    a Service Representative at 1-800-345-3533.

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


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

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

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX
816-340-7962

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

BUSINESS, NOT-FOR-PROFIT AND
EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-353

Visit our Web site at WWW.AMERICANCENTURY.COM [link to web site with arrow]


SH-PRF-16091   9904                                   Funds Distributor, Inc.
<PAGE>
[front cover]

AMERICAN CENTURY

Fund Profile

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


Equity Growth Fund

This profile  summarizes key information  about the fund that is included in the
fund's Prospectus.  The fund's Prospectus includes additional  information about
the fund,  including a more detailed  description of the risks  associated  with
investing in the fund, that you may want to consider before you invest.

[photos of woman and girls blowing bubbles, men talking, woman at computer]

                                                                  APRIL 25, 1999
                                                                  INVESTOR CLASS

 You may obtain the Prospectus and other  information  about the fund at no cost
  by calling us at 1-800-345-2021, accessing our Web site or visiting one of our
   Investor Centers. See the back cover for additional telephone numbers and our
                                                                        address.




EQUITY GROWTH FUND

1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

    Equity Growth seeks capital appreciation by investing in common stocks.

2. WHAT IS THE FUND'S INVESTMENT STRATEGY?

    The fund's investment strategy utilizes  quantitative  management techniques
    in a two-step  process  that draws  heavily on computer  technology.  In the
    first step,  the fund  managers  rank stocks,  primarily  the 1,500  largest
    publicly  traded  companies in the United  States  (measured by the value of
    their stock),  from most attractive to least attractive.  This is determined
    by using a computer model that combines measures of a stock's value, as well
    as measures of its growth potential. To measure value, the fund managers use
    ratios of stock  price-to-book  value and stock  price-to-cash  flow,  among
    others. To measure growth,  the fund managers use, among others, the rate of
    growth of a company's  earnings and changes in the earnings  estimates for a
    company.

    In the second  step,  the fund  managers  use a technique  called  portfolio
    optimization.  In portfolio  optimization,  the fund managers use a computer
    model to build a portfolio  of stocks  that they  believe  will  provide the
    optimal  balance  between  risk and  expected  return of the  portfolio,  as
    measured in the stock  ranking  completed in the first step.  The goal is to
    create a fund that provides  better  returns than the S&P 500 without taking
    on significant additional risk.

    The fund may invest in  securities  other than stocks,  such as  convertible
    securities,  foreign  securities,  short-term  instruments and non-leveraged
    stock index futures contracts.  "Non-leveraged"  means that the fund may not
    invest in futures contracts where it would be possible to lose more than the
    fund invested.

    Additional information about Equity Growth's investments is available in its
    annual and semiannual  reports.  In these reports you will find a discussion
    of the  market  conditions  and  investment  strategies  that  significantly
    affected the fund's  performance  during the most recent fiscal period.  You
    may get these reports at no cost by calling us.

3. WHAT ARE THE SIGNIFICANT RISKS OF INVESTING IN THE FUND?

    * The value of Equity Growth's shares depends on the value of the stocks and
    other  securities it owns. The value of the individual  securities  that the
    fund owns will go up and down depending on the  performance of the companies
    that issued  them,  general  market and  economic  conditions,  and investor
    confidence.

    * Market  performance  tends to be  cyclical  and,  in the  various  cycles,
    certain investment styles may fall in and out of favor. If the market is not
    favoring  the fund's  style,  the fund's  gains may not be as big as, or its
    losses may be bigger than,  other equity  funds using  different  investment
    styles.

    * As with all funds,  at any given  time the value of your  shares of Equity
    Growth may be worth  more or less than the price you paid.  If you sell your
    shares when the value is less than the price you paid, you will lose money.

    * An investment in the fund is not a bank deposit,  and it is not insured or
    guaranteed by the Federal Deposit Insurance  Corporation (FDIC) or any other
    government agency.

    * Although  the fund  managers  invest the fund's  assets  primarily in U.S.
    stocks, Equity Growth can invest in securities of foreign companies. Foreign
    securities can have certain unique risks, including fluctuations in currency
    exchange  rates,   unstable  political  and  economic  structures,   reduced
    availability  of  public  information,  and the  lack of  uniform  financial
    reporting and regulatory practices similar to those that apply to U.S.
    issuers.

    In  summary,  Equity  Growth is  intended  for  investors  who seek  capital
    appreciation  through an equity fund and who are willing to accept the risks
    associated with the fund's investment strategy.

    FUND PERFORMANCE

    The  following  bar chart shows the actual  performance  of Equity  Growth's
    Investor  Class shares for each calendar year since the fund's  inception on
    May 9, 1991. The bar chart indicates the volatility of the fund's historical
    returns  from year to year.  The bar chart and the  performance  information
    below are not intended to indicate how the fund will perform in the future.


Equity Growth                                 American Century Investments




[data shown in bar chart]
    Calendar Year-By-Year Returns (1)
           1998           25.45%
           1997           36.06%
           1996           27.34%
           1995           34.56%
           1994           -0.23%
           1993           11.42%
           1992            4.13%

           (1) As of  March  31,  1999,  the  end of the  most  recent  calendar
           quarter, Equity Growth's year-to-date return was -0.16%.

    The highest and lowest quarterly returns for the period reflected in the bar
    chart are:

                              Highest                 Lowest
    Equity Growth             23.10% (4Q 1998)        -13.88% (3Q 1998)

    The following  table shows the average annual return of the fund's  Investor
    Class  shares for the periods  indicated.  The S&P 500 Index,  an  unmanaged
    index that  reflects no  operating  costs,  is  included as a benchmark  for
    performance comparisons.

                             1 YEAR          5 YEARS          LIFE OF FUND(1)
AVERAGE ANNUAL TOTAL RETURNS (PERIOD ENDED MARCH 31, 1999)
    Equity Growth             8.11%          25.03%              19.09%
    S&P 500 Index            18.42%          26.19%              19.44%

        (1) The inception date for Equity Growth is May 9, 1991.

4. WHAT ARE THE FUND'S FEES AND EXPENSES?

    There are no sales loads, fees or other charges

    * to buy fund shares directly from American Century

    * to reinvest dividends in additional shares

    * to exchange into the Investor Class shares of other American Century fund

    * to redeem your shares

    The following table describes the fees and expenses that you will pay if you
    buy and hold shares of the fund.


     ANNUAL FUND OPERATING EXPENSES
     (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)
               Management Fee                                           0.69%(1)
               Distribution and Service (12b-1) Fees                    None
               Other Expenses (2)                                       0.00%
               Total Annual Fund Operating Expenses                     0.69%


        (1) Based on expenses  incurred  during the fund's  most  recent  fiscal
        year.  The fund has a stepped  fee  schedule.  As a result,  the  fund's
        management fee rate generally decreases as fund assets increase.

        (2) Other  expenses,  which  include the fees and expenses of the fund's
        independent directors,  their legal counsel,  interest and extraordinary
        expenses,  are  expected to be less than  0.005% for the current  fiscal
        year.

           EXAMPLE

             Assuming you . . .
             * invest $10,000 in the fund
             * redeem all of your shares at the end of the periods shown below *
             earn a 5% return each year * incur the same  operating  expenses as
             shown above

             . . . your cost of investing in the fund would be:

             1 year           3 years          5 years            10 years
               $70              $220             $383                $856

            Of course,  actual costs may be higher or lower. Use this example to
            compare the costs of investing in other funds.

5. WHO ARE THE FUND'S INVESTMENT ADVISOR AND PORTFOLIO MANAGERS?

    American Century Investment  Management,  Inc. provides  investment advisory
    and  management  services  for the  fund.  American  Century  uses  teams of
    portfolio  managers,  assistant  portfolio  managers  and  analysts  working
    together to manage its mutual funds.  The  portfolio  managers on the Equity
    Growth team are identified as follows:

    JOHN  SCHNIEDWIND,  Senior  Vice  President  and Group  Leader--Quantitative
    Equity,  has been a member of the team that manages  Equity Growth since its
    inception.  He joined  American  Century in 1982 and also  supervises  other
    portfolio management teams. He has degrees from Purdue University and an MBA
    in finance from the  University of California.  He is a Chartered  Financial
    Analyst.


Fund Profile                                                  Equity Growth




    JEFFREY R. TYLER,  Senior Vice President and Portfolio  Manager,  has been a
    member of the team that manages  Equity  Growth  since June 1997.  He joined
    American  Century as a Portfolio  Manager in 1988.  He has a  bachelor's  in
    business  economics  from the University of California and an MBA in finance
    and economics  from  Northwestern  University.  He is a Chartered  Financial
    Analyst.

6. HOW DO I BUY FUND SHARES?

    *  Complete and return the enclosed application

    *  Call us and exchange shares from another American Century fund

    *  Call us and send your investment by bank wire transfer

    Your  initial  investment  must be at least $2,500  ($1,000 for  traditional
    IRAs,  Roth IRAs and UGMA/UTMA  accounts)  unless you establish an automatic
    investment  plan of at least  $50 per  month.  If your  redemption  activity
    causes the value of your  account to fall below this account  minimum,  your
    shares may be redeemed involuntarily.

7. HOW DO I SELL FUND SHARES?

    You may sell all or part of your fund shares on any  business day by writing
    or calling us. You also may exchange your shares in Equity Growth for shares
    in nearly 70 other mutual funds  offered by American  Century.  Depending on
    the options you select when you open your  account,  some  restrictions  may
    apply.  For your  protection,  some redemption  requests require a signature
    guarantee.

8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED?

    Equity  Growth  pays  distributions  of  substantially  all  of  its  income
    quarterly.  Distributions from realized capital gains are paid twice a year,
    usually in March and  December.  Distributions  may be  taxable as  ordinary
    income,  capital gains or a combination of the two.  Capital gains are taxed
    at  different  rates  depending  on the  length  of time the  fund  held the
    securities that were sold.  Distributions  are reinvested  automatically  in
    additional shares unless you choose another option.

9. WHAT SERVICES ARE AVAILABLE?

    American Century offers several ways to make it easier for you to manage
    your account, such as

    * telephone transactions 
    * wire and electronic funds transfers 
    * 24-hour Automated Information Line transactions
    * 24-hour online Internet account access and transactions

    You will find more information  about these choices in our Investor Services
    Guide,  which you may  request  by  calling  us,  accessing  our Web site or
    visiting one of our Investor Centers.

    Information   contained  in  our  Investor   Services   Guide   pertains  to
    shareholders  who invest directly with American  Century rather than through
    an employer-sponsored retirement plan or financial intermediary.

    If  you  own  or  are   considering   purchasing   fund  shares  through  an
    employer-sponsored  retirement plan or financial intermediary,  your ability
    to purchase  shares of the fund,  exchange them for shares of other American
    Century  funds,  and  redeem  them will  depend on the terms of your plan or
    financial  intermediary.  If  you  have  questions  about  investing  in  an
    employer-sponsored retirement plan or through a financial intermediary, call
    a Service Representative at 1-800-345-3533.

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


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

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

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX
816-340-7962

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

BUSINESS, NOT-FOR-PROFIT AND
EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-353

Visit our Web site at   WWW.AMERICANCENTURY.COM [link to web site with arrow]


SH-PRF-16092   9904                                   Funds Distributor, Inc.
<PAGE>
[front cover]

AMERICAN CENTURY

Fund Profile

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


Small Cap Quantitative Fund

This profile  summarizes key information  about the fund that is included in the
fund's Prospectus.  The fund's Prospectus includes additional  information about
the fund,  including a more detailed  description of the risks  associated  with
investing in the fund, that you may want to consider before you invest.

[photos of woman and girls blowing bubbles, men talking, woman at computer]

                                                                  APRIL 25, 1999
                                                                  INVESTOR CLASS

You may obtain the Prospectus and other information about the fund at no cost by
calling us at  1-800-345-2021,  accessing  our Web site or  visiting  one of our
Investor  Centers.  See the back cover for additional  telephone numbers and our
address.




SMALL CAP QUANTITATIVE FUND

1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

    Small Cap Quantitative seeks capital  appreciation by investing primarily in
    common stocks of small companies.

2. WHAT IS THE FUND'S INVESTMENT STRATEGY?

    The fund's investment strategy utilizes  quantitative  management techniques
    in a two-step  process  that draws  heavily on computer  technology.  In the
    first step,  the fund  managers  rank stocks,  primarily  smaller  companies
    (measured  by the  value of their  stock),  from  most  attractive  to least
    attractive.  This is  determined  by using a computer  model  that  combines
    measures of a stock's value, as well as measures of its growth potential. To
    measure value, the fund managers use ratios of stock price-to-book value and
    stock price-to-cash flow, among others. To measure growth, the fund managers
    use, among others, the rate of growth of a company's earnings and changes in
    the earnings estimates for a company.

    In the second  step,  the fund  managers  use a technique  called  portfolio
    optimization.  In portfolio  optimization,  the fund managers use a computer
    model to build a portfolio  of stocks  that they  believe  will  provide the
    optimal  balance  between  risk and  expected  return of the  portfolio,  as
    measured in the stock  ranking  completed in the first step.  The goal is to
    create a fund that provides  better returns than the S&P Small-Cap 600 Index
    without taking on significant additional risk.

    The fund invests  primarily in common stocks of companies which, at the time
    of  investment,  have market  capitalization  not  greater  than that of the
    largest company in the S&P Small-Cap 600 Index.  The S&P Small-Cap 600 Index
    is an unmanaged stock index that tracks the performance of equity securities
    of smaller companies. As of March 31, 1999, the largest company in the index
    had a market capitalization of approximately $3.6 billion,  while the median
    company  in the  index had a market  capitalization  of  approximately  $401
    million.

    The fund may invest in  securities  other than stocks,  such as  convertible
    securities,  foreign  securities,  short-term  instruments and non-leveraged
    stock index futures contracts.  "Non-leveraged"  means that the fund may not
    invest in futures contracts where it would be possible to lose more than the
    fund invested.

    Additional  information  about  Small  Cap  Quantitative's   investments  is
    available  in  its  semiannual  report.  In  this  report  you  will  find a
    discussion  of  the  market   conditions  and  investment   strategies  that
    significantly  affected the fund's performance during the most recent fiscal
    period. You may get this report at no cost by calling us.

3. WHAT ARE THE SIGNIFICANT RISKS OF INVESTING IN THE FUND?

    * The value of Small Cap  Quantitative's  shares depends on the value of the
    stocks and other securities it owns. The value of the individual  securities
    the  fund  owns  will go up and down  depending  on the  performance  of the
    companies  that issued them,  general  market and economic  conditions,  and
    investor confidence.

    * Market  performance  tends to be  cyclical  and,  in the  various  cycles,
    certain investment styles may fall in and out of favor. If the market is not
    favoring  the fund's  style,  the fund's  gains may not be as big as, or its
    losses may be bigger than,  other equity  funds using  different  investment
    styles.

    * As with all funds, at any given time the value of your shares of Small Cap
    Quantitative  may be worth more or less than the price you paid. If you sell
    your  shares  when the value is less than the price you paid,  you will lose
    money.

    * An investment in the fund is not a bank deposit,  and it is not insured or
    guaranteed by the Federal Deposit Insurance  Corporation (FDIC) or any other
    government agency.

    * Although  the fund  managers  invest the fund's  assets  primarily in U.S.
    stocks,   Small  Cap  Quantitative  can  invest  in  securities  of  foreign
    companies.  Foreign  securities  can have certain  unique  risks,  including
    fluctuations  in currency  exchange rates,  unstable  political and economic
    structures,  reduced  availability  of public  information,  and the lack of
    uniform financial  reporting and regulatory  practices similar to those that
    apply to U.S. issuers.


Small Cap Quantitative                        American Century Investments




    In summary,  Small Cap  Quantitative  is  intended  for  investors  who seek
    capital appreciation through a small capitalization  equity fund and who are
    willing to accept the risks associated with the fund's investment strategy.

4. WHAT ARE THE FUND'S FEES AND EXPENSES?

    There are no sales loads, fees or other charges

    * to buy fund shares directly from American Century

    * to reinvest dividends in additional shares

    * to exchange into the Investor Class shares of other American Century fund

    * to redeem your shares

    The following table describes the fees and expenses that you will pay if you
    buy and hold shares of the fund.

     ANNUAL FUND OPERATING EXPENSES
     (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)
               Management Fee                                0.88%(1)
               Distribution and Service (12b-1) Fees           None
               Other Expenses(2)                             0.00%
               Total Annual Fund Operating Expenses          0.88%

        (1) Based on expenses  incurred  during the fund's  most  recent  fiscal
        year.  The fund has a stepped  fee  schedule.  As a result,  the  fund's
        management fee rate generally decreases as fund assets increase.

        (2) Other  expenses,  which  include the fees and expenses of the fund's
        independent directors,  their legal counsel,  interest and extraordinary
        expenses,  are  expected to be less than  0.005% for the current  fiscal
        year.

           EXAMPLE
             Assuming you . . .
             * invest $10,000 in the fund
             * redeem all of your shares at the end of the periods shown below
             * earn a 5% return each year
             * incur the same operating expenses as shown above
             . . . your cost of investing in the fund would be:
                    1 year            3 years
                      $96              $299

             Of course, actual costs may be higher or lower. Use this example to
             compare the costs of investing in other funds.

5. WHO ARE THE FUND'S INVESTMENT ADVISOR AND PORTFOLIO MANAGERS?

    American Century Investment  Management,  Inc. provides  investment advisory
    and  management  services  for the  fund.  American  Century  uses  teams of
    portfolio  managers,  assistant  portfolio  managers  and  analysts  working
    together to manage its mutual funds. The portfolio managers on the Small Cap
    Quantitative team are identified as follows:

    JOHN  SCHNIEDWIND,  Senior  Vice  President  and Group  Leader--Quantitative
    Equity, supervises the team that manages Small Cap Quantitative. He has been
    a member of the team that manages the fund since its inception in July 1998.
    He has  degrees  from  Purdue  University  and an MBA in  finance  from  the
    University of California. He is a Chartered Financial Analyst.

    KURT  BORGWARDT,   Vice  President,   Portfolio   Manager  and  Director  of
    Quantitative  Equity  Research,  joined  American  Century in 1990,  and has
    managed the  quantitative  equity  research effort since then. He has been a
    member of the team that  manages the fund since its  inception in July 1998.
    He has a degree from Stanford University and an MBA with a specialization in
    finance from the University of Chicago. He is a Chartered Financial Analyst

    WILLIAM MARTIN,  Vice President and Portfolio Manager,  has been a member of
    the team that manages the fund since its  inception in July 1998.  He joined
    American  Century in 1989. He has a bachelor's  degree in economics from the
    University of Illinois. He is a Chartered Financial Analyst.

6. HOW DO I BUY FUND SHARES?

    *  Complete and return the enclosed application

    *  Call us and exchange shares from another American Century fund

    *  Call us and send your investment by bank wire transfer

    Your  initial  investment  must be at least $2,500  ($1,000 for  traditional
    IRAs,  Roth IRAs and UGMA/UTMA  accounts)  unless you establish an automatic
    investment  plan of at least  $50 per  month.  If your  redemption  activity
    causes the value of your  account to fall below this account  minimum,  your
    shares may be redeemed involuntarily.


Fund Profile                                         Small Cap Quantitative




7. HOW DO I SELL FUND SHARES?

    You may sell all or part of your fund shares on any  business day by writing
    or calling us. You also may exchange  your shares in Small Cap  Quantitative
    for shares in nearly 70 other  mutual  funds  offered by  American  Century.
    Depending  on the  options  you  select  when you open  your  account,  some
    restrictions  may  apply.  For your  protection,  some  redemption  requests
    require a signature guarantee.

8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED?

    Small Cap Quantitative pays distributions of substantially all of its income
    quarterly.  Distributions from realized capital gains are paid twice a year,
    usually in March and  December.  Distributions  may be  taxable as  ordinary
    income,  capital gains or a combination of the two.  Capital gains are taxed
    at  different  rates  depending  on the  length  of time the  fund  held the
    securities that were sold.  Distributions  are reinvested  automatically  in
    additional shares unless you choose another option.

9. WHAT SERVICES ARE AVAILABLE?

    American Century offers several ways to make it easier for you to manage
    your account, such as

    * telephone transactions 
    * wire and electronic funds transfers 
    * 24-hour Automated Information Line transactions
    * 24-hour online Internet account access and transactions

    You will find more information  about these choices in our Investor Services
    Guide,  which you may  request  by  calling  us,  accessing  our Web site or
    visiting one of our Investor Centers.

    Information   contained  in  our  Investor   Services   Guide   pertains  to
    shareholders  who invest directly with American  Century rather than through
    an employer-sponsored retirement plan or financial intermediary.

    If  you  own  or  are   considering   purchasing   fund  shares  through  an
    employer-sponsored  retirement plan or financial intermediary,  your ability
    to purchase  shares of the fund,  exchange them for shares of other American
    Century  funds,  and  redeem  them will  depend on the terms of your plan or
    financial  intermediary.  If  you  have  questions  about  investing  in  an
    employer-sponsored retirement plan or through a financial intermediary, call
    a Service Representative at 1-800-345-3533.

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


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

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

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX
816-340-7962

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

BUSINESS, NOT-FOR-PROFIT AND
EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-353

Visit our Web site at WWW.AMERICANCENTURY.COM [link to web site with arrow]


SH-PRF-16093   9904                                   Funds Distributor, Inc.


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