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[front cover] AMERICAN CENTURY Fund Profile [american century logo (reg. sm)] American Century Prime Money Market 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] JANUARY 24, 2000 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. PRIME MONEY MARKET FUND 1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE? Prime Money Market seeks to earn the highest level of current income while preserving the value of your investment. 2. WHAT IS THE FUND'S INVESTMENT STRATEGY? The fund earns its income by investing in high-quality, cash-equivalent securities. These securities are short-term obligations of banks, governments and corporations that are payable in U.S. dollars. Additional information about Prime Money Market'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? * 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 seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund. * Because cash-equivalent securities are among the safest securities available, the interest they pay is among the lowest for income-paying securities. Accordingly, the yield on this fund will likely be lower than yields on funds that invest in longer-term or lower-quality securities. FUND PERFORMANCE The following bar chart shows the actual performance of Prime Money Market's Investor Class shares for each full calendar year since the fund's inception on November 17, 1993. 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. [data shown in bar chart] Calendar Year-By-Year Returns (1) 1999 1998 1997 1996 1995 1994 Prime Money Market 4.77 5.18% 5.26% 5.09% 5.70% 4.47% (1) From August 1, 1997, to May 31, 1998, all or a portion of the fund's management fee was waived. As a result, the fund's returns are higher than they would have been had the waiver not been in effect. The highest and lowest quarterly returns for the period reflected in the bar chart are: Highest Lowest Prime Money Market 1.47% (1Q 1995) 0.84% (1Q 1994) The following table shows the average annual total returns of the fund's shares for the periods indicated. The 90-Day Treasury Bill Index, an unmanaged index that reflects no operating costs, is included as a benchmark for performance comparisons. The index is derived from secondary market interest rates as published by the Federal Reserve Bank. For current performance information, including seven-day yield, please call us or access our Web site. 1 YEAR 5 YEARS LIFE OF FUND(1) AVERAGE ANNUAL TOTAL RETURNS (PERIOD ENDED DECEMBER 31, 1999)((2)) Prime Money Market 4.77% 5.20% 5.05% 90-Day Treasury Bill Index 4.74% 5.11% 4.95%(3) (1) The inception date for Prime Money Market is November 17, 1993. (2) From August 1, 1997, to May 31, 1998, all or a portion of the fund's management fee was waived. As a result, the fund's returns are higher than they would have been had the waiver not been in effect. (3) Since November 30, 1993, the date nearest the fund's inception for which data are available. Prime Money Market American Century Investments 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 0.60%(1) Distribution and Service (12b-1) Fees None Other Expenses 0.00%(2) Total Annual Fund Operating Expenses 0.60% (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 trustees, their legal counsel and interest, were less than 0.005% for the most recent 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 $61 $192 $334 $749 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. Identified below is the portfolio manager who leads the team that manages Prime Money Market: DENISE TABACCO, Portfolio Manager, has been a member of the team that manages Prime Money Market since May 1996. She joined American Century in 1988, becoming a member of its portfolio department in 1991. She has a bachelor's degree in accounting from San Diego State University and an MBA in finance from Golden Gate University. 6. HOW DO I BUY FUND SHARES? American Century offers several ways to purchase shares * Complete and return an application along with an investment check payable to American Century Investments * If you already have an American Century account, call us or access our Web site to 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 and Roth IRAs). 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 Prime Money Market 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. Prime Money Market Fund Profile 8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED? Dividends are declared and available for redemption daily. Because Prime is a money market fund, its distributions generally will be taxed as ordinary income. If the fund's share price were to go up or down, its annual distributions also could include capital gains or losses. 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 Your Guide to American Century Services, which you may request by calling us, accessing our Web site or visiting one of our Investor Centers. Information contained in the 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 SH-PRF-19005 0001 Funds Distributor, Inc., Distributor[front cover] AMERICAN CENTURY Fund Profile [american century logo (reg.sm)] American Century --------- Brokerage --------- Prime Money Market 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] JANUARY 24, 2000 INVESTOR CLASS You may obtain the Prospectus and other information about the fund at no cost by calling us at 1-888-345-2071, accessing our Web site or visiting one of our Investor Centers. See the back cover for additional telephone numbers and our address. PRIME MONEY MARKET FUND 1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE? Prime Money Market seeks to earn the highest level of current income while preserving the value of your investment. 2. WHAT IS THE FUND'S INVESTMENT STRATEGY? The fund earns its income by investing in high-quality, cash-equivalent securities. These securities are short-term obligations of banks, governments and corporations that are payable in U.S. dollars. Additional information about Prime Money Market'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? * 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 seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund. * Because cash-equivalent securities are among the safest securities available, the interest they pay is among the lowest for income-paying securities. Accordingly, the yield on this fund will likely be lower than yields on funds that invest in longer-term or lower-quality securities. FUND PERFORMANCE The following bar chart shows the actual performance of Prime Money Market's Investor Class shares for each full calendar year since the fund's inception on November 17, 1993. 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. [data shown in bar chart] Calendar Year-By-Year Returns (1) 1999 1998 1997 1996 1995 1994 Prime Money Market 4.77 5.18% 5.26% 5.09% 5.70% 4.47% (1) From August 1, 1997, to May 31, 1998, all or a portion of the fund's management fee was waived. As a result, the fund's returns are higher than they would have been had the waiver not been in effect. The highest and lowest quarterly returns for the period reflected in the bar chart are: Highest Lowest Prime Money Market 1.47% (1Q 1995) 0.84% (1Q 1994) The following table shows the average annual total returns of the fund's shares for the periods indicated. The 90-Day Treasury Bill Index, an unmanaged index that reflects no operating costs, is included as a benchmark for performance comparisons. The index is derived from secondary market interest rates as published by the Federal Reserve Bank. For current performance information, including seven-day yield, please call us or access our Web site. 1 YEAR 5 YEARS LIFE OF FUND(1) AVERAGE ANNUAL TOTAL RETURNS (PERIOD ENDED DECEMBER 31, 1999)((2)) Prime Money Market 4.77% 5.20% 5.05% 90-Day Treasury Bill Index 4.74% 5.11% 4.95%(3) (1) The inception date for Prime Money Market is November 17, 1993. (2) From August 1, 1997, to May 31, 1998, all or a portion of the fund's management fee was waived. As a result, the fund's returns are higher than they would have been had the waiver not been in effect. (3) Since November 30, 1993, the date nearest the fund's inception for which data are available. Prime Money Market American Century Investments 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 0.60%(1) Distribution and Service (12b-1) Fees None Other Expenses 0.00%(2) Total Annual Fund Operating Expenses 0.60% (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 trustees, their legal counsel and interest, were less than 0.005% for the most recent 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 $61 $192 $334 $749 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. Identified below is the portfolio manager who leads the team that manages Prime Money Market: DENISE TABACCO, Portfolio Manager, has been a member of the team that manages Prime Money Market since May 1996. She joined American Century in 1988, becoming a member of its portfolio department in 1991. She has a bachelor's degree in accounting from San Diego State University and an MBA in finance from Golden Gate University. 6. HOW DO I BUY FUND SHARES? American Century Brokerage offers several ways to purchase shares * Complete and return a brokerage application along with an investment check payable to American Century Brokerage * Call us and send your investment by bank wire transfer * If you already have an American Century Brokerage account, simply contact us by writing, calling or accessing our Web site Your initial investment in your brokerage account must be at least $2,500. 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? The most convenient way for you to sell money market fund shares in your brokerage account is to use our CheckWriting feature. If you do not have checks, you can call us during business hours or send us a letter requesting a redemption check or bank wire. Bank wires require a minimum redemption of $1,000 and a $20 fee applies. In addition, we will automatically sell sufficient shares in Prime Money Market when you direct us to make other investments in your brokerage account. Prime Money Market Fund Profile Depending on the options you select when you open your account, some restrictions may apply. For your protection, some redemption requests may require a signature guarantee. 8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED? Dividends are declared and available for redemption daily. Because Prime is a money market fund, its distributions generally will be taxed as ordinary income. If the fund's share price were to go up or down, its annual distributions also could include capital gains or losses. Distributions are reinvested automatically in additional shares unless you choose another option. 9. WHAT SERVICES ARE AVAILABLE? American Century Brokerage offers several ways to make it easier for you to manage your account, such as * telephone transactions * wire and electronic funds transfers * TeleSelect Automated Information and Trading Line transactions * 24-hour online Internet account access and transactions You will find more information about these choices in our Brokerage Information Kit, which you may request by calling us, accessing our Web site or visiting one of our Investor Centers. -------------------------------------------------------------------------------- [american century logo (reg.sm)] American Century --------- Brokerage --------- AMERICAN CENTURY BROKERAGE, INC. P.O. BOX 419146 KANSAS CITY, MISSOURI 64141-6146 BROKERAGE CLIENT RELATIONS ASSOCIATE 1-888-345-2071 FAX 650-967-9627 TELESELECT AUTOMATED INFORMATION AND TRADING LINE 1-888-345-2091 TELECOMMUNICATIONS DEVICE FOR THE DEAF 1-800-634-4113 SEP-IRA SERVICES 1-800-345-3533, ext. 4210 Visit our Web site at WWW.AMERICANCENTURY.COM BK-PRF-19006 0001 Funds Distributor, Inc., Distributor
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