Calamos ETF Trust - Calamos Bitcoin 80 Series Structured Alt Protection ETF - October

Calamos ETF Trust - Calamos Bitcoin 80 Series Structured Alt Protection ETF - October is an exchange traded fund launched by Calamos Investments LLC. The fund is managed by Calamos Advisors LLC. The fund invests in bitcoin. It uses derivatives such as FLexible EXchange Options that reference the performance of the CME CF Bitcoin Reference Rate — New York Variant to create its portfolio. Calamos ETF Trust - Calamos Bitcoin 80 Series Structured Alt Protection ETF - October was formed on October 7, 2025 and is domiciled in the United States.