# EDGAR Filing Document

**Accession Number:** 0001710607
**File Stem:** 0001710607-25-000281
**Filing Date:** 2025-7
**Character Count:** 3706
**Document Hash:** 48d744d3b9f74beaf6f34c913cd740f8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001710607-25-000281.hdr.sgml**: 20250731

**ACCESSION NUMBER**: 0001710607-25-000281

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 19

**FILED AS OF DATE**: 20250731

**DATE AS OF CHANGE**: 20250731

**EFFECTIVENESS DATE**: 20250731

**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:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-221045
- **FILM NUMBER:** 251169991

**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)

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

---

## 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            |

?xml version='1.0' encoding='ASCII'? ck0001710607-20250731

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| | |
|:---|:---|
| <br>**Prospectus Supplement**<br>**American Century Diversified Municipal Bond ETF** | ![newaci_logoblk.jpg](ck0001710607-20250731_g1.jpg) |
| Supplement dated August 1, 2025 ■ Prospectus dated January 1, 2025 | Supplement dated August 1, 2025 ■ Prospectus dated January 1, 2025 |

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*The following replaces the* Fees and Expenses *table on page 2 of the prospectus:*

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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> *The advisor has agreed to waive 0.02 percentage points of the fund's management fee. The advisor expects this waiver to continue until July 31, 2026 and cannot terminate it prior to such date without the approval of the Board of Trustees.*

*The following replaces the* Example *section on page 2 of the prospectus:*

**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 and that you earn a 5% return each year. The example also assumes 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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©2025 American Century Proprietary Holdings, Inc. All rights reserved.CL-SPL-98769 2508