Document


Statement of Additional Information (SAI) Supplement American Century ETF Trust
Supplement dated July 3, 2026 n Statement of Additional Information dated January 1, 2026

Joseph Reiland, CFA, Vice President and Senior Portfolio Manager, has announced his plans to retire. As a result, he will no longer serve as a portfolio manager for the funds effective July 31, 2026.

Justin Brown, CFA, Vice President and Portfolio Manager, no longer serves as portfolio manager for the funds effective July 31, 2026.

The following replaces the entries for DJ Cross and Scott Marolf in the Accounts Managed table on pages 24-25 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)

DJ Cross1

Number of Accounts

Assets

$18.3 billion2

$582.0 million

$658.7 million

Scott Marolf1

Number of Accounts

Assets

$18.3 billion2

$582.0 million

$658.7 million

2 Includes $296.7 million in American Century Large Cap Equity ETF and $10.0 million in American Century Large Cap Growth ETF.

The following replaces the entries for DJ Cross and Scott Marolf in the Ownership of Securities table on page 27 of the SAI:


Ownership of Securities
			Aggregate Dollar Range of Securities in Fund
American Century Large Cap Equity ETF
DJ Cross1			A
Scott Marolf1			A
American Century Large Cap Growth ETF
DJ Cross1			B
Scott Marolf1			E

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.