Unthink ETFs™ With American Century Investments^®

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.

The fund is an actively managed ETF that does not seek to replicate the performance of a specified index.

Proxy Portfolio Risk: The goal of the Proxy Portfolio is to track closely the daily performance of the Actual Portfolio. The Proxy Portfolio is designed to reflect the economic exposures and the risk characteristics of the Actual Portfolio on any given trading day.

• ETFs trading on the basis of a published Proxy Portfolio may exhibit wider premiums and discounts, bid/ask spreads, and tracking error than other ETFs using the same investment strategies that publish their portfolios on a daily basis, especially during periods of market disruption or volatility. Therefore, shares of the fund may cost investors more to trade than shares of a traditional ETF.

• Each day the fund calculates the overlap between the holdings of the prior Business Day's Proxy Portfolio compared to the Actual Portfolio (Proxy Overlap) and the difference, in percentage terms, between the Proxy Portfolio per share NAV and that of the Actual Portfolio (Tracking Error).

• Although the fund seeks to benefit from keeping its portfolio information secret, market participants may attempt to use the Proxy Portfolio to identify a fund's trading strategy, which if successful, could result in such market participants engaging in certain predatory trading practices that may have the potential to harm the fund and its shareholders.

Premium/Discount Risk: Although the Proxy Portfolio is intended to provide investors with enough information to allow for an effective arbitrage mechanism that will keep the market price of the fund at or close to the underlying net asset value (NAV) per share of the fund, there is a risk (which may increase during periods of market disruption or volatility) that market prices will vary significantly from the underlying NAV of the fund.

Trading Issues Risk: Trading halts may have a greater impact on this fund compared to other ETFs due to the fund's nontransparent structure.

Authorized Participant Concentration Risk: Only an authorized participant may engage in creation or redemption transactions directly with the fund. The fund may have a limited number of institutions that act as authorized participants. The fact that the fund is offering a novel and unique structure may affect the number of entities willing to act as Authorized Participants. During times of market stress, Authorized Participants may be more likely to step away from this type of ETF than a traditional ETF.

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.

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.

Convertible securities are typically bond or debt securities and preferred stock that may be converted into a prescribed amount of common stock or other equity security of the issuing company at a particular time and price. The value of convertible securities may rise and fall with the market value of the associated common stock or, like a debt security, vary with changes in interest rates and the credit quality of the company issuing the bond or security. A convertible security tends to perform more like a stock when the associated common stock price is high relative to the conversion price and more like a debt security when the associated common stock price is low relative to the conversion price.

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 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.

The lower rated securities in which the fund invests are subject to greater credit risk, default risk and liquidity risk.

The portfolio management team limits its investable universe of companies by screening out those that raise concerns based on the team's evaluation of multiple environmental, social, and corporate governance (ESG) metrics. The portfolio managers utilize ESG data from third party sources, as well as proprietary evaluations, to decide what securities should be excluded due to ESG concerns. Because the portfolio managers screen securities based on ESG characteristics, the fund may exclude the securities of certain issuers or industry sectors for other than financial reasons and, as a result, the fund may perform differently or maintain a different risk profile than the market generally or compared to funds that do not use similar ESG-based screens. Investing based on ESG considerations may also prioritize long term rather than short term returns. Due to the lack of regulation and uniform reporting standards with respect to ESG characteristics of issuers, ESG data may be inconsistent or inaccurate across sources. In addition, all relevant ESG data considered by the team may not be available for an issuer.

Returns or yields for the fund would have been lower if .02% of the fund's management fee had not been waived. The advisor expects this waiver to continue until December 31, 2024, and cannot terminate it prior to such date without the approval of the Board of Trustees. Review the annual or semiannual report for the most current information.

The fund's investments are designed to correlate with inflation. There is no guarantee, however, that the value of the fund's securities will increase over time or that the future investment performance will correlate with inflation. Purchasing power decreases as inflation increases, and the future value of the fund's assets could decline. Further, to the extent the fund's investments do correlate with inflation, the value of the fund's investments could decline if inflation or inflation expectations recede. In addition, the fund invests primarily in a diverse group of U.S. equity companies in market sectors and industry groups the portfolio managers expect to appreciate in value if the U.S. inflation rate rises or is believed to be rising. The fund seeks to focus its investments in those industries that historically have had, or are expected to have, better performance in periods of rising inflation, which generally includes financial services, oil and gas, metals and mining, healthcare, and consumer staples companies. The prospectus contains very important information about the different risks associated with those types of industries and companies.

The interest rate and corresponding payment that floating rate securities are expected to pay adjust at predetermined dates on a periodic basis. Securities with floating interest rates are generally less sensitive to interest rate changes than securities with fixed interest rates, but they may decline in value if their interest rates do not rise as much, or as quickly, as comparable market interest rates. In addition, floating rate securities held by the fund may be less liquid or more difficult to sell than other securities. If it becomes necessary for the fund to sell less liquid securities, it could have an adverse effect on the fund, especially during periods of market turbulence or unusually low trading activity.

The value of the securities that the fund principally invests in may be secured or backed by other underlying assets or obligations. As such, the value of these securities may affected by the market value of the underlying assets, changes in the distributions on the underlying assets, defaults and recoveries on the underlying assets, capital gains and losses on the underlying assets, prepayments on underlying assets and the availability, prices and interest rate of underlying assets. In addition, these securities may be subject to number of additional risks, including interest rate, market, credit and correlation risk. Use of certain types of these securities can create economic leverage in the fund's portfolio, which may result in significant volatility and cause the fund to participate in losses in an amount that exceeds the fund's initial investment. Also, the value of these securities may decrease based on the inability or perceived inability of a security's issuer or obligated party to make interest and principal payments.

These funds are actively managed ETFs that do 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's performance and risks reflect the performance and risks of the underlying funds in which it invests. By investing in another investment company, the Fund becomes a shareholder of that investment company and bears its proportionate share of the fees and expenses of the other investment company.

The fund's performance and risks depend in part on the managers' skill in selecting and weighting the asset classes and underlying funds and implementing any deviations from the target range, which may differ from actual market conditions.

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

Historically, small- and/or mid-cap stocks have been more volatile than the stock of larger, more-established companies. Smaller companies may have limited resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies.

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.

Returns or yields for the fund would have been lower if .02% of the fund's management fee had not been waived. The advisor expects this waiver to continue until December 31, 2024, and cannot terminate it prior to such date without the approval of the Board of Trustees. Review the annual or semiannual report for the most current information.

Generally, as interest rates rise, the value of the bonds held in the fund will decline. The opposite is true when interest rates decline.

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.

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

Historically, small- and/or mid-cap stocks have been more volatile than the stock of larger, more-established companies. Smaller companies may have limited resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies.

Because the fund invests primarily in California municipal securities and securities issued by U.S. territories, its yield and share price will be affected by political and economic developments within the state and territories.

There is no guarantee that all of the fund’s income will be exempt from federal, California state or local income taxes. The portfolio managers are permitted to invest the fund’s assets in debt securities with interest payments that are subject to federal income tax, California state tax, local income tax and/or the federal alternative minimum tax. Capital gains are not exempt from state and federal income tax.

These funds are actively managed ETFs that do 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.