| American Century Quality Preferred ETF invests at least 80% of the fund s net assets, plus any borrowings for investment purposes, in preferred securities issued by U.S. and non-U.S. companies. Preferred securities in which the fund may invest include preferred stock, hybrid preferred securities that have characteristics similar to both preferred stock and debt securities, floating rate preferred securities, junior subordinated debt, senior unsecured debt obligations denominated in $25 par amounts (senior notes or baby bonds), re-packaged preferreds, and convertible securities. |