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

Exchange Traded Funds (ETFs) are bought and sold through exchange trading at market price (not NAV), and are not individually redeemed from the fund. Shares may trade at a premium or discount to their NAV in the secondary market. Brokerage commissions will reduce returns.

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.

There is no assurance that the fund will be less volatile than the market over the long term or for any specified period. The fund’s strategy of constructing a portfolio that realizes lower volatility than the market may not produce the intended result. A security’s volatility can change very quickly, and specific securities in the fund’s portfolio may become more volatile than expected. Additionally, low volatility investments may underperform the equity markets during periods of strong, rising or speculative equity markets.

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.

Brokerage Services are provided by American Century Brokerage, a division of American Century Investment Services, Inc., registered broker/dealer, member FINRASIPC.

S&P 500® Index

The S&P 500® Index is composed of 500 selected common stocks most of which are listed on the New York Stock Exchange. It is not an investment product available for purchase.

Closing Price: The price of the last reported trade on the fund's primary exchange.

Bid Ask Midpoint: The midpoint between the highest bid and the lowest offer on the primary listing exchange, as of the time that the Fund's NAV is calculated, generally around 4 p.m. (Eastern time).

Premium Discount: A premium is the amount that the fund is trading above the reported NAV, expressed as a percentage of the NAV. A discount is the amount that the fund is trading below the reported NAV, expressed as a percentage of the NAV.

ETF Market Performance (Inception to Date): The fund's per share Net Asset Value (NAV) is the value of one share of the fund. Market Price is determined by using the midpoint between the highest bid and the lowest offer on the primary stock exchange on which the shares of the fund are listed for trading, as of the time that the fund's NAV is calculated. The NAV Return is based on the NAV of the fund, and the Market Price Return is based on the market price per share of the fund. Since shares of the fund did not trade in the secondary market until after the fund's inception, for the period from inception to the first day of secondary market trading in shares of the fund, the NAV of the fund is used as a proxy for the Market Price to calculate market returns. Market Price and NAV returns assume that dividends and capital gain distributions have been reinvested in the fund at Market Price and NAV, respectively.

Weighted Average Market Cap: The weighted average market value of a company's outstanding shares.

Holdings: The number of holdings in the fund excluding cash positions and derivatives such as futures and currency forwards.

Investment Blend: Reflects the blend of securities owned by a fund. For example, the percentage of foreign or domestic stocks held by an equity fund or the percentage of corporate and government securities owned by a bond fund. The U.S./Foreign Convertibles grouping includes Convertible Bonds, Equity Linked Securities and Convertible Preferred securities.

Sector Weights: This value represents the sectors included in the portfolio on a percent of assets basis.

Top Holdings: This value represents the top holdings included in the portfolio on a percent of assets basis. Holding weights are rounded to the nearest whole number, which may result in the display of less than ten holdings. Holdings are subject to change without notice. Shares are units of ownership interest in a corporation or financial asset that provide for an equal distribution in any profits, if any are declared, in the form of dividends. In the context of debt instruments, principal can refer to the face value, or par value, of a bond—that is, the actual amount listed on the bond itself. American Century Investments publishes this listing of identities and quantities of each position held by the fund on each business day, before commencement of trading. Securities are reported at market value. The portfolio data and its presentation here may differ from the complete schedules of investments in regulatory filings due to differing accounting and reporting requirements.

Countries: This value represents the countries included in the portfolio on a percent of assets basis.

Regions: This value represents the regions of the country represented by the securities included in the portfolio on a percent of assets basis.

For detailed descriptions of indices or investing terms referenced above, refer to our glossary.

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Exchange Traded Funds (ETFs): Foreside Fund Services, LLC - Distributor, not affiliated with American Century Investments Services, Inc.