American Century ETF Trust Statement of Additional Information (SAI) Supplement Avantis® U.S. Core Equity ETF
Supplement dated October 7, 2026 n SAI dated May 5, 2026

The following replaces the information for Avantis All International Core Equity ETF and Avantis U.S. Core Equity ETF in the Costs Associated with Creation Transactions table on pages 40-41 of the SAI:

Fund			Standard Creation Transaction Fee			Maximum Additional Charge for Creations1
Avantis U.S. Core Equity ETF			$850			3%

1 As a percentage of the NAV per Creation Unit.

The following replaces the information for Avantis All International Core Equity ETF and Avantis U.S. Core Equity ETF in the Costs Associated with Redemption Transactions table on page 42 of the SAI:

Fund			Standard Redemption Transaction Fee			Maximum Additional Charge for Redemptions1
Avantis U.S. Core Equity ETF			$850			2%

1 As a percentage of the NAV per Creation Unit, inclusive of the standard redemption transaction fee.

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