The Calamos Strategic Total Return Fund functions as a closed-end balanced mutual fund, originally launched by Calamos Investments LLC and currently managed by Calamos Advisors LLC. This fund primarily allocates capital within the public equity and fixed income markets of the United States, targeting investments in companies operating across a wide range of sectors. Its portfolio predominantly features common and preferred stocks from businesses of all market capitalizations, alongside convertible securities and high-yield corporate bonds, which typically maintain an average S&P credit rating of BB.