American Century^® Quality Preferred ETF - QPFF

Index performance does not represent the fund's performance. It is not possible to invest directly in an index.

This fund is an actively managed ETF that does not seek to replicate the performance of a specified index. To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments, interest rates and various credit metrics. If the portfolio manager considerations are inaccurate or misapplied, the fund's performance may suffer.

The fund is classified as non-diversified. Because it is non-diversified, it may hold large positions in a small number of securities. To the extent it maintains such positions; a price change in any one of those securities may have a greater impact on the fund's share price than if it were diversified.

International investing involves special risks, such as political instability and currency fluctuations. Investing in emerging markets may accentuate these risks.

Preferred securities combine some of the characteristics of both common stocks and bonds. Preferred securities may receive preferential treatment compared to common stock regarding dividends, but they are typically subordinated to a company's other debt which subjects them to greater credit risk. Generally, holders of preferred securities have no voting rights. A company issuing preferred securities may defer dividend payments on the securities and may redeem the securities prior to a specified date. Preferred securities may also be substantially less liquid than other securities and may have less upside potential than common stock.

Floating rate securities are structured so that the security's coupon rate or the interest paid on a bond fluctuates based upon a reference rate. In a falling interest rate environment, the coupon on floating rate securities will generally decline, causing a reduction in the fund's income. A floating rate security's coupon rate resets periodically according to the terms of the security. In a rising interest rate environment, floating rate securities with coupon rates that reset infrequently may lag behind the changes in market interest rates. Floating rate securities may also contain terms that impose a maximum coupon rate the company issuing the security will pay, therefore decreasing the value of the security.

Concentrating investments in a particular industry or group of industries gives the fund greater exposure than other funds to market, economic and other factors affecting that industry or group of industries. The financials sector can be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt, and the availability and cost of capital.

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.