U.S. Government Money Market Fund

Data reflects past performance for Investor Class shares, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value fluctuates. Redemption value may be more or less than original cost. Obtain performance data current to the most recent quarter end. For additional share class information, consult the prospectus.

Returns or yields for the fund would have been lower if a portion of the management fee had not been waived. Review the annual or semiannual report for the most current information.

Performance for periods before December 1, 2015, is based on the fund's prior investment strategy, which allowed the fund to invest in a wider range of securities and did not require the fund to invest at least 99.5% of its assets in cash, U.S. government securities, or fully collateralized repurchase agreements.

Fund shares are not guaranteed by the U.S. Government.

The gross expense ratio is the fund's total annual operating costs, expressed as a percentage of the fund's average net assets for a given time period. It is gross of any fee waivers or expense reimbursement. The net expense ratio is the expense ratio after the application of any waivers or reimbursement. This is the actual ratio that investors paid during the fund's most recent fiscal year. Please see the prospectus for more information.

^W2 Minimum initial investment is $1,000 for IRA and CESA accounts, and $2,500 for non-retirement accounts, but these minimums are waived with an initial investment of at least $500 per account and automatic investments of at least $100 per month. If your account balance falls below the minimum, or if you cancel your automatic monthly investment plan prior to reaching the minimum, American Century Investments may redeem the account and send the proceeds to you. Prior to doing so, we will notify you and give you 90 days to meet the minimum or reinstate your automatic monthly investment plan.

Lipper rankings are based on average annual total returns. Portions of the mutual fund performance information contained on this page were supplied by Lipper, a Thomson Reuters Company, subject to the following: Copyright ©2020 Thomson Reuters. All rights reserved. Any copying, republication or redistribution of Lipper content, including by caching, framing or similar means, is expressly prohibited without the prior written consent of Lipper. Lipper shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon. Performance data is preliminary and subject to revision. Rankings are based on all classes available within the classification as of the date shown. Rankings are based only on the universe shown.