The Innovator S&P Investment Grade Preferred ETF (EPRF) is a mutual fund that seeks to provide investors with exposure to a diversified portfolio of investment grade preferred securities. These securities are issued by companies that have a strong credit rating and offer a fixed dividend payment. The fund aims to track the performance of the S&P U.S. Preferred Stock Index, which includes preferred stocks from a variety of industries. This ETF offers investors a way to potentially earn income and diversify their portfolio through preferred securities.