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Statement of Additional Information (SAI) Supplement American Century ETF Trust
Supplement dated August 23, 2024 n SAI dated June 20, 2024

The following changes are effective September 1, 2024:

The following entry for Lynn Chen is added to the Accounts Managed table on pages 51-52 of the SAI. The following entry for Jason Greenblath replaces his entry in the Accounts Managed table on pages 51-52 of the SAI:

Accounts Managed

Registered Investment

Companies (e.g.,

American Century

Investments funds and

American Century

Investments -

subadvised funds)

Other Pooled

Investment Vehicles

(e.g., commingled trusts

and 529 education

savings plans)

Other Accounts (e.g.,

separate accounts and

corporate accounts,

including incubation

strategies and

corporate money)

Lynn Chen1

Number of Accounts

Assets

$4.1 billion2

N/A

$1.4 billion

Jason Greenblath1

Number of Accounts

Assets

$13.3 billion3

N/A

1 Information provided as of August 20, 2024.

2 Includes $31.5 million in American Century Emerging Markets Bond ETF.

3 Includes $31.5 million in American Century Emerging Markets Bond ETF; $473.2 million in American Century Diversified Corporate Bond ETF; $58.4 million in American Century Multisector Floating Income ETF; $188.1 million in American Century Multisector Income ETF; and $54.0 million in American Century Short Duration Strategic Income ETF.

The following entries are added to the Ownership of Securities table on pages 54-55 of the SAI:


Ownership of Securities
			Aggregate Dollar Range of Securities in Fund
American Century Emerging Markets Bond ETF
Lynn Chen1			A
Jason Greenblath1			A

1 Information provided as of August 20, 2024.

Ranges: A – none; B – $1-$10,000; C – $10,001-$50,000; D – $50,001-$100,000; E – $100,001-$500,000; F – $500,001-$1,000,000; G – More than $1,000,000.


©2024 American Century Proprietary Holdings, Inc. All rights reserved. CL-SPL-98545 2408