EPRF sets its eligible universe as preferred stocks included by both the S&P U.S. Fixed Rate Preferred Stock Index and the S&P U.S. Investment Grade Preferred Stock Index, effectively isolating fixed-rate, investment grade, U.S.-listed preferred shares. EPRF specifically targets investment grade securities, the first ETF in the preferred stock space to do so. Note that High Quality in the fund name only refers to its investment grade mandate, and does not include other so-called quality screens. The fund gives a 75% weight to cumulative shares, and 25% weight to non-cumulative shares. Individual securities are given an equal weight within these buckets. Prior to July 16, 2018 the fund was called Innovator S&P High Quality Preferred ETF.