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The filing is an amendment to a Schedule 13G reporting that a group of related Apollo entities and Athene Annuity and Life Company collectively hold 1,920,000 Series F Mandatory Redeemable Preferred Shares of Calamos Strategic Total Return Fund. That holding represents 48.0% of the 4,000,000 MRPS outstanding (per the issuer's certified shareholder report dated April 30, 2025). No reporting person claims sole voting or dispositive power; each reports zero sole power and shared voting and dispositive power over 1,920,000 shares. The filing states the securities were acquired and are held in the ordinary course of business and not to change or influence control of the issuer.