PFF targets preferred securities irrespective of credit rating, providing a broad and diversified portfolio. The funds holdings reflect the nature of the market in that financial institutions dominate the holdings. The underlying index and portfolio are rebalanced monthly. PFF particularly stands out for strong block liquidity, making it the fund of choice for large traders. For investors, it is important to consider how much of the distribution can be classified as qualified dividend income. Prior to February 1, 2019, the fund tracked a similar index from S&P.