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Investment Risks - American Century ETF Trust
May 05, 2026
Avantis All International Core Equity ETF | Equity Securities Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Equity Securities Risk — The value of equity securities, may fluctuate due to changes in investor perception of a specific issuer, changes in the general condition of the stock market, or occurrences of political or economic events that affect equity issuers and the market. Common stock prices may be particularly sensitive to rising interest rates, as the cost of capital rises and borrowing costs increase.
Avantis All International Core Equity ETF | Small-Cap Stock Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Small-Cap Stock Risk — Smaller companies may have limited financial resources, product lines, markets and have less publicly available information. These securities may trade less frequently and in more limited volumes than larger companies’ securities, leading to higher transaction costs. Smaller companies also may be more sensitive to changing economic conditions, and investments in smaller foreign companies may experience more price volatility.
Avantis All International Core Equity ETF | Currency Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Currency Risk — The fund could experience gains or losses solely on changes in the exchange rate between foreign currencies and the U.S. dollar.
Avantis All International Core Equity ETF | Foreign Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Foreign Risk — Foreign securities are generally riskier than U.S. securities. Political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), natural disasters and public health emergencies occurring in a country where the fund invests could cause the fund’s investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.
Avantis All International Core Equity ETF | Emerging Markets Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Emerging Markets Risk — The fund may invest in emerging markets securities. Investing in emerging market countries is generally riskier than investing in foreign developed countries. Emerging market countries may have unstable governments, economies that are subject to sudden change, and significant volatility in their financial markets. These countries also may lack the legal, business and social framework to support securities markets. Additionally, certain jurisdictions do not provide the PCAOB with sufficient access to inspect audit work papers and practices, or otherwise do not cooperate with U.S. regulators, potentially exposing investors in U.S. capital markets to significant risks.
Avantis All International Core Equity ETF | Depositary Receipts Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Depositary Receipts Risk — Investment in depositary receipts does not eliminate all the risks inherent in investing in securities of non-U.S. issuers. The market value of depositary receipts is dependent upon the market value of the underlying securities and fluctuations in the relative value of the currencies in which the depositary receipts and the underlying securities are quoted.
Avantis All International Core Equity ETF | Investment Process Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Investment Process Risk — Stocks selected by the portfolio managers may perform differently than expected due to the portfolio managers’ judgments regarding the factors used, the weight placed on each factor, changes from the factors’ historical trends, and technical issues with the construction and implementation of the investment process (including, for example, data problems and/or software or other implementation issues). There is no guarantee that the investment process will result in effective investment decisions for the fund.
Avantis All International Core Equity ETF | In-Kind Seeding Risk Member  
Prospectus [Line Items]  
Risk [Text Block] In-Kind Seeding Risk — The fund expects to acquire a significant amount of securities at its launch through one or more in-kind contributions that are intended to qualify as tax-deferred transactions governed by Section 351 of the Internal Revenue Code. If one or more of the in-kind contributions were to fail to qualify for tax-deferred treatment, then the fund would not take a carryover tax basis in the applicable contributed securities and may incorrectly calculate and report to shareholders the amount and/or character of gain or loss recognized to those applicable investors on the subsequent disposition of such securities by the fund. Additionally, investments in the fund may be less tax-efficient than an investment in other ETFs because a significant portion of the fund's initial portfolio may consist of securities with a low tax basis. As a result, the fund may realize higher amounts of realized gains when selling securities and may be required to distribute capital gains even in the initial year of the fund's operations.
Avantis All International Core Equity ETF | Cash Transactions Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Cash Transactions Risk — The fund may effect its creations and redemptions for cash, rather than for in-kind securities. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in-kind. As such, investments in fund shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind. Cash transactions may have to be carried out over several days if the securities market is relatively illiquid and may involve considerable brokerage fees and taxes. Brokerage fees and taxes will be higher than if the fund sold and redeemed shares in-kind.
Avantis All International Core Equity ETF | Style Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Style Risk — If at any time the market is not favoring the fund’s investment style, the fund’s gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.
Avantis All International Core Equity ETF | Market Trading Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Market Trading Risk — The fund faces numerous market trading risks, including the potential lack of an active market for fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation and/or redemption process of the fund. Any of these factors, among others, may lead to the fund’s shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than NAV when you buy shares of the fund in the secondary market, and you may receive less (or more) than NAV when you sell those shares in the secondary market. The portfolio managers cannot predict whether shares will trade above (premium), below (discount) or at NAV.
Avantis All International Core Equity ETF | Market Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Market Risk — The value of the fund’s shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund’s investments. Natural disasters, public health emergencies, war, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.
Avantis All International Core Equity ETF | Authorized Participant Concentration Risk Member  
Prospectus [Line Items]  
Risk [Text Block] 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. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other authorized participant is able to step forward to process creation and/or redemption orders, fund shares may trade at a discount to net asset value (NAV) and possibly face trading halts and/or delisting. This risk may be more pronounced in volatile markets, potentially where there are significant redemptions in ETFs generally.
Avantis All International Core Equity ETF | Price Volatility Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Price Volatility Risk — The value of the fund’s shares may fluctuate significantly in the short term.
Avantis All International Core Equity ETF | Large Shareholder Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Large Shareholder Risk — Certain shareholders, including seed investors or other funds advised by the advisor, may from time to time own a substantial amount of the shares of the fund. In addition, a third party investor, the advisor or an affiliate of the advisor, an authorized participant, a market maker, or another entity may invest in the fund and hold its investment for a limited period of time solely to facilitate commencement of the fund or to facilitate the fund’s achieving a specified size or scale. There can be no assurance that any large shareholder would not redeem its investment, that the size of the fund would be maintained at such levels or that the fund would continue to meet applicable listing requirements. Redemptions by large shareholders could have a significant negative impact on the fund, including causing the fund to incur transaction costs or realize capital gains. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the NYSE Arca, Inc. and may, therefore, have a material upward or downward effect on the market price of the shares.
Avantis All International Core Equity ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] Principal Loss Risk — At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.
Avantis All International Core Equity ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block]
An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Avantis U.S. Core Equity ETF | Equity Securities Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Equity Securities Risk — The value of equity securities, may fluctuate due to changes in investor perception of a specific issuer, changes in the general condition of the stock market, or occurrences of political or economic events that affect equity issuers and the market. Common stock prices may be particularly sensitive to rising interest rates, as the cost of capital rises and borrowing costs increase.
Avantis U.S. Core Equity ETF | Small-Cap Stock Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Small-Cap Stock Risk — Smaller companies may have limited financial resources, product lines, markets and have less publicly available information. These securities may trade less frequently and in more limited volumes than larger companies’ securities, leading to higher transaction costs. Smaller companies also may be more sensitive to changing economic conditions.
Avantis U.S. Core Equity ETF | Investment Process Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Investment Process Risk — Stocks selected by the portfolio managers may perform differently than expected due to the portfolio managers’ judgments regarding the factors used, the weight placed on each factor, changes from the factors’ historical trends, and technical issues with the construction and implementation of the investment process (including, for example, data problems and/or software or other implementation issues). There is no guarantee that the investment process will result in effective investment decisions for the fund.
Avantis U.S. Core Equity ETF | In-Kind Seeding Risk Member  
Prospectus [Line Items]  
Risk [Text Block] In-Kind Seeding Risk — The fund expects to acquire a significant amount of securities at its launch through one or more in-kind contributions that are intended to qualify as tax-deferred transactions governed by Section 351 of the Internal Revenue Code. If one or more of the in-kind contributions were to fail to qualify for tax-deferred treatment, then the fund would not take a carryover tax basis in the applicable contributed securities and may incorrectly calculate and report to shareholders the amount and/or character of gain or loss recognized to those applicable investors on the subsequent disposition of such securities by the fund. Additionally, investments in the fund may be less tax-efficient than an investment in other ETFs because a significant portion of the fund's initial portfolio may consist of securities with a low tax basis. As a result, the fund may realize higher amounts of realized gains when selling securities and may be required to distribute capital gains even in the initial year of the fund's operations.
Avantis U.S. Core Equity ETF | Cash Transactions Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Cash Transactions Risk — The fund may effect its creations and redemptions for cash, rather than for in-kind securities. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in-kind. As such, investments in fund shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind. Cash transactions may have to be carried out over several days if the securities market is relatively illiquid and may involve considerable brokerage fees and taxes. Brokerage fees and taxes will be higher than if the fund sold and redeemed shares in-kind.
Avantis U.S. Core Equity ETF | Style Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Style Risk — If at any time the market is not favoring the fund’s investment style, the fund’s gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.
Avantis U.S. Core Equity ETF | Market Trading Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Market Trading Risk — The fund faces numerous market trading risks, including the potential lack of an active market for fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation and/or redemption process of the fund. Any of these factors, among others, may lead to the fund’s shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than NAV when you buy shares of the fund in the secondary market, and you may receive less (or more) than NAV when you sell those shares in the secondary market. The portfolio managers cannot predict whether shares will trade above (premium), below (discount) or at NAV.
Avantis U.S. Core Equity ETF | Market Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Market Risk — The value of the fund’s shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund’s investments. Natural disasters, public health emergencies, war, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.
Avantis U.S. Core Equity ETF | Authorized Participant Concentration Risk Member  
Prospectus [Line Items]  
Risk [Text Block] 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. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other authorized participant is able to step forward to process creation and/or redemption orders, fund shares may trade at a discount to net asset value (NAV) and possibly face trading halts and/or delisting. This risk may be more pronounced in volatile markets, potentially where there are significant redemptions in ETFs generally.
Avantis U.S. Core Equity ETF | Price Volatility Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Price Volatility Risk — The value of the fund’s shares may fluctuate significantly in the short term.
Avantis U.S. Core Equity ETF | Large Shareholder Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Large Shareholder Risk — Certain shareholders, including seed investors or other funds advised by the advisor, may from time to time own a substantial amount of the shares of the fund. In addition, a third party investor, the advisor or an affiliate of the advisor, an authorized participant, a market maker, or another entity may invest in the fund and hold its investment for a limited period of time solely to facilitate commencement of the fund or to facilitate the fund’s achieving a specified size or scale. There can be no assurance that any large shareholder would not redeem its investment, that the size of the fund would be maintained at such levels or that the fund would continue to meet applicable listing requirements. Redemptions by large shareholders could have a significant negative impact on the fund, including causing the fund to incur transaction costs or realize capital gains. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the NYSE Arca, Inc. and may, therefore, have a material upward or downward effect on the market price of the shares.
Avantis U.S. Core Equity ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] Principal Loss Risk — At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.
Avantis U.S. Core Equity ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block]
An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.