# EDGAR Filing Document

**Accession Number:** 0001710607
**File Stem:** 0001710607-25-000372
**Filing Date:** 2025-12
**Character Count:** 19575
**Document Hash:** 2f8646bfc5990964b24dd4b0db187909
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001710607-25-000372.hdr.sgml**: 20251231

**ACCESSION NUMBER**: 0001710607-25-000372

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20251231

**DATE AS OF CHANGE**: 20251231

**EFFECTIVENESS DATE**: 20251231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMERICAN CENTURY ETF TRUST
- **CENTRAL INDEX KEY:** 0001710607

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0831

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-221045
- **FILM NUMBER:** 251616236

**BUSINESS ADDRESS:**
- **STREET 1:** 4500 MAIN STREET
- **CITY:** KANSAS CITY
- **STATE:** MO
- **ZIP:** 64111
- **BUSINESS PHONE:** (816) 531-5575

**MAIL ADDRESS:**
- **STREET 1:** 4500 MAIN STREET
- **CITY:** KANSAS CITY
- **STATE:** MO
- **ZIP:** 64111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** American Century ETF Trust
- **DATE OF NAME CHANGE:** 20170628

## Series and Classes Contracts Data

### American Century Diversified Municipal Bond ETF (Series ID: S000063026)

| Class ID   | Class Name                                      | Ticker Symbol   |
|:---|:---|:---|
| C000204482 | American Century Diversified Municipal Bond ETF | TAXF            |

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| | |
|:---|:---|
| **Summary Prospectus &nbsp;&nbsp;&nbsp;&nbsp;** <br>January 1, 2026 | ![aci_horizxrgbxblackcroppeda.jpg](aci_horizxrgbxblackcroppeda.jpg) |
| **American Century**<sup>®</sup> **Diversified Municipal Bond ETF** | **American Century**<sup>®</sup> **Diversified Municipal Bond ETF** |
| **Ticker:** TAXF | **Exchange:** NYSE Arca, Inc. |

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| |
|:---|
| Before you invest, you may want to review the fund's prospectus, which contains more information about the fund and its risks. You can find the fund's prospectus, reports to shareholders, and other information about the fund online at americancentury.com/etfdocs. You can also get this information at no cost by calling 833-ACI-ETFS or sending an email request to prospectus@americancentury.com. The fund's prospectus and other information are also available from financial intermediaries through which shares of the fund may be purchased or sold. |
| This summary prospectus incorporates by reference the fund's <u>[prospectus and statement of additional information](https://www.sec.gov/ix?doc=/Archives/edgar/data/0001710607/000171060725000314/ck0001710607-20251229.htm)</u> (SAI) each dated January 1, 2026 (as supplemented at the time you receive this summary prospectus), as well as the Report of Independent Registered Public Accounting Firm and the financial statements included in the fund's <u>[Form N-CSR](https://www.sec.gov/ix?doc=/Archives/edgar/data/0001710607/000171060725000307/ck0001710607-20250831.htm)</u> for the fiscal year ended August 31, 2025. The fund's SAI and Form N-CSR may be obtained, free of charge, in the same manner as the prospectus. |

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**Investment Objective**

The fund seeks current income that is exempt from federal income tax.

**Fees and Expenses**

The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

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| | |
|:---|:---|
| **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the value of your investment) | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the value of your investment) |
| Management Fee | 0.29% |
| Other Expenses | 0.00% |
| Total Annual Fund Operating Expenses | 0.29% |
| Fee Waiver<sup>1</sup> | 0.02% |
| Total Annual Fund Operating Expenses After Fee Waiver | 0.27% |

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<sup>1</sup>*&nbsp;&nbsp;&nbsp;&nbsp;The advisor has agreed to waive 0.02 percentage points of the fund's management fee. The advisor expects this waiver to continue until <br>December 31, 2026 and cannot terminate it prior to such date without the approval of the Board of Trustees.*

**Example**

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that you earn a 5% return each year, and that the fund's operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

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| | | | |
|:---|:---|:---|:---|
| *1 year* | *3 years* | *5 years* | *10 years* |
| $28 | $91 | $161 | $367 |

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**Portfolio Turnover**

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 36% of the average value of its portfolio.

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**Principal Investment Strategies**

The fund invests in municipal and other debt securities. Under normal market conditions, the portfolio managers invest at least 80% of the fund's net assets, plus borrowings for investment purposes, in municipal securities with interest payments exempt from federal income tax. Some of these investments in municipal securities are not necessarily exempt from the federal alternative minimum tax.

The fund principally invests in investment-grade debt securities but may invest in high-yield securities (junk bonds). A high-yield security is one that has been rated below investment-grade or determined by the investment advisor to be of similar quality, including bonds that are in technical or monetary default. Issuers of these securities often have short financial histories or have questionable credit or have had and may continue to have problems making interest and principal payments. The portfolio managers also may buy unrated securities if they determine such securities meet the investment objective of the fund.

The fund may purchase debt securities of any duration, and the average duration of the fund will vary based on the portfolio managers' forecast of interest rates.

Although the fund seeks current income, it also employs techniques designed to realize capital appreciation. For example, the portfolio managers may select bonds with maturities and coupon rates that position the fund for potential capital appreciation for a variety of reasons, including their view on the direction of future interest-rate movements and the potential for a credit upgrade.

The fund is an actively managed exchange-traded fund (ETF) that does not seek to replicate the performance of a specified index. When deciding whether to buy or sell a security, and how and when to implement a trade, portfolio managers consider, among other things, current and anticipated changes in interest rates, the credit quality of a particular issuer, comparable alternatives, general market conditions and any other factor deemed relevant by the portfolio managers. They may also consider the expected implementation costs and tax consequences of the trade in an attempt to gain trading efficiencies, avoid unnecessary risk, minimize tax impact, and/or enhance fund performance.

**Principal Risks**

**• Credit Risk —** Debt securities, even investment-grade debt securities, are subject to credit risk. The risk that the inability or perceived inability of a security's issuer to make interest and principal payments may cause the value of the security to decrease. As a result, the fund's share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect. The fund's investments may have high credit risk, which helps the fund pursue a higher yield than more conservatively managed bond funds.

**• Below Investment-Grade Securities Risk —** Issuers of lower rated, high-yield securities are more vulnerable to real or perceived economic changes (such as an economic downturn or a prolonged period of rising interest rates), political changes, or adverse developments specific to the issuer. Adverse economic, political and other developments may be more likely to cause an issuer of low-quality bonds to default on its obligation to pay interest and principal due under its securities. The fund may invest in securities rated below investment-grade or that are unrated, including bonds that are in technical or monetary default. By definition, the issuers of many of these securities have had and may continue to have problems making interest and principal payments. High-yield securities are speculative.

• **Interest Rate Risk —** When interest rates change, the fund's share value will be affected. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. Because the fund may invest in intermediate-term and long-term bonds, the fund's interest rate risk is generally higher than for funds with shorter-weighted average maturities, such as money market and short-term bond funds. A period of rising interest rates may negatively affect the fund's performance.

**• Municipal Securities Risk —** Because the fund invests principally in municipal securities, it will be sensitive to events that affect municipal markets, including legislative or political changes and the financial condition of the issuers of municipal securities.

**• 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.

• **Tax Risk —** Some or all of the fund's income may be subject to the federal alternative minimum tax. There is no guarantee that all of the fund's income will remain exempt from federal or state income taxes. Income from municipal bonds held by a fund could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state tax authorities, or noncompliant conduct of a bond issuer. The fund may sell securities that lose their tax-exempt statuses at inopportune times, which may cause tax consequences or a decrease in the fund's value.

• **Liquidity Risk —** During periods of market turbulence or unusually low trading activity, to meet redemptions, it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund's share price. Changing regulatory

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and market conditions, including increases in interest rates and credit spreads may adversely affect the liquidity of the fund's investments.

**• 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.

**• Market Risk —** The risk that the value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. 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.

**• 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.

• **Large Shareholder Risk —** Certain shareholders, including 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. 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.

• **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.

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.

**Fund Performance**

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

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**Calendar Year Total Returns**

![chart-f5e19466935149e6956a.jpg](chart-f5e19466935149e6956a.jpg)

**Highest Performance Quarter (4Q 2023): 7.33% Lowest Performance Quarter (1Q 2022): -6.18%**

**As of September 30, 2025, the most recent calendar quarter end, the fund's year-to-date return was 2.48%.**

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| | | | | |
|:---|:---|:---|:---|:---|
| **Average Annual Total Returns** <br>*For the calendar year ended December 31, 2024* | *1 year* | *5 years* | *Since Inception* | *Inception Date* |
| **American Century Diversified Municipal Bond ETF Shares** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Return Before Taxes | 2.05% | 1.40% | 2.54% | 09/10/2018 |
| &nbsp;&nbsp;&nbsp;&nbsp;Return After Taxes on Distributions | 2.05% | 1.40% | 2.54% | 09/10/2018 |
| &nbsp;&nbsp;&nbsp;&nbsp;Return After Taxes on Distributions and Sale of Fund Shares | 2.59% | 1.64% | 2.54% | 09/10/2018 |
| **S&P National AMT-Free Municipal Bond Index**<sup>®</sup><br>&nbsp;&nbsp;&nbsp;&nbsp;(reflects no deduction for fees, expenses or taxes) | 1.32% | 1.07% | 2.19% |  |

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

**Portfolio Management**

**Investment Advisor**

American Century Investment Management, Inc.

**Portfolio Managers**

**Joseph Gotelli**, Vice President and Senior Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 2008.

**Alan Kruss**, Vice President and Portfolio Manager, has served on teams managing fixed-income investments for American Century Investments since joining the advisor in 1997.

**Purchase and Sale of Fund Shares**

The fund is an ETF. Fund shares may only be bought and sold in a secondary market through a broker-dealer at a market price. Because ETF shares trade at market prices rather than NAV, shares may trade at a price greater than NAV (a premium) or less than NAV (a discount). An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares of the fund (bid) and the lowest price a seller is willing to accept for shares of the fund (ask) when buying or selling shares in the secondary market (bid-ask spread). Investors can find information on the fund's NAV, market price, premiums and discounts, and bid-ask spread at americancentury.com.

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**Tax Information**

The fund intends to distribute income that is exempt from regular federal income tax, however, fund distributions may be subject to capital gains tax. A portion of the fund's distributions may be subject to federal income tax or to the federal alternative minimum tax.

If you hold your fund shares through a tax-deferred investment plan, such as a 401(k) plan or an IRA, any distributions received from the fund may be taxable as ordinary income upon withdrawal from the tax-deferred plan, regardless of whether the distributions were tax-exempt when earned.

**Payments to Broker-Dealers and Other Financial Intermediaries**

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the advisor and its related companies may pay the intermediary for the sale of fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.

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<br>©2026 American Century Proprietary Holdings, Inc. All rights reserved.

CL-SUM-94304 2601

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