AC Alternatives^® Income Fund

Returns or yields for the fund would have been lower if .14% of the management fee had not been waived. The advisor expects this waiver to continue until February 28, 2021. Review the annual or semiannual report for the most current information.

Investment return and principal value of security investments will fluctuate. The value at the time of redemption may be more or less than the original cost. Past performance is no guarantee of future results.

^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.

Alternative mutual funds generally hold a variety of non-traditional investments, and generally employ more complex trading strategies than traditional mutual funds. Specifically, the fund may invest in, among other securities, lower-rated debt securities; securities backed by other assets (like mortgages or auto loans); companies engaged in the real estate industry; and entities that must invest in energy infrastructure, financial services or real estate to obtain special tax status. The fund may invest in these strategies directly, through short positions (effectively borrowing and then selling a security with a future delivery date in hopes that it will decline in price in the interim), or through other derivatives, such as futures or options.

Each of these alternative asset classes and investment strategies has unique risks typically making them more suitable for investors with an above average tolerance for risk or longer investment horizon. Specifically, among other risks, lower-rated debt securities may be subject to greater default and liquidity risk; asset-backed securities may be subject to prepayment, credit and default risk; real estate securities may be subject to changes in economic conditions and interest rates; and special tax entities may be subject to a change in tax status and the risks of concentrating in a particular region or industry.

In addition, these investments may be executed through investment strategies with unique risks. One of the risks of investing through short positions includes that the stock price will go up, exposing the short seller to potentially unlimited price risk. One of the risks of investing in derivatives is volatility. Specifically, derivatives investing can be typically executed for less than investing directly in the underlying asset. Small movements in the underlying asset's price, however, can result in significant volatility in the related derivative investment. In addition, most derivative investments involve a counterparty, which subjects the investment to the credit risk of each counterparty to a derivatives transaction.

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.