Prospectus by Investment Company (Form 497)

Summary Prospectus and Prospectus Supplement American Century® Focused Dynamic Growth ETF Summary Prospectus and Prospectus dated January 1, 2025 Focused Dynamic Growth Fund Summary Prospectus and Prospectus dated December 1, 2025
Supplement dated March 7, 2026

Henry He, CFA, Vice President and Portfolio Manager, will no longer serve as portfolio manager for the funds effective March 31, 2026.

The following entry is added for Yeon Hee Oh in the Portfolio Managers section effective March 15, 2026:

Yeon Hee Oh, Portfolio Manager and Senior Investment Analyst, has been a member of the team that manages the fund since 2022.

The following entry is added for Yeon Hee Oh in The Fund Management Team section effective March 15, 2026:

Yeon Hee Oh

Ms. Oh, Portfolio Manager and Senior Investment Analyst, has been a member of the team that manages the fund since joining the advisor in 2022. She joined American Century Investments as a senior investment analyst, and became a portfolio manager in 2026. She has a bachelor's degree in economics from Barnard College and a master's degree in business administration from New York University.

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