The Invesco Preferred ETF (PGX) aims to replicate the performance of the ICE BofAML Core Plus Fixed Rate Preferred Securities Index. To achieve this, the Fund typically allocates a minimum of 80% of its total assets to fixed-rate, US dollar-denominated preferred securities that are components of this underlying index. The Index itself comprises fixed-rate, US dollar-denominated preferred securities issued within the domestic U.S. market. These securities must satisfy specific criteria: they require an average credit rating of at least B3 from leading agencies like Moody's, S&P, and Fitch. Additionally, they must originate from countries with an investment-grade risk profile, assessed by the average foreign currency long-term sovereign debt ratings provided by the same three agencies. Rather than fully replicating the entire index, the Fund employs a "sampling" methodology to pursue its investment objective efficiently. Both the Fund and its benchmark index undergo monthly rebalancing and reconstitution.