iShares Preferred and Income Securities ETF (PFF) is an exchange-traded fund that seeks to track the investment results of an index composed of U.S. dollar-denominated preferred and hybrid securities issued by U.S. companies, primarily listed on the NYSE and NASDAQ; the fund employs a passive management approach through full replication of the underlying index, which selects securities using rules-based proprietary methods and weights them by market capitalization. Core offerings include exposure to a diversified portfolio of approximately 450 holdings encompassing preferred stocks, hybrid securities, and select baby bonds concentrated in the financial sector (over 80% allocation), providing investors with high-yield income opportunities from investment-grade and below-rated instruments with an average effective duration of around four years and a 30-day SEC yield typically exceeding 6%; the fund's expense ratio stands at 0.45%, managed by BlackRock Fund Advisors. Launched on March 26, 2007, and domiciled in the United States with headquarters aligned to BlackRock's operations in New York, PFF targets income-focused investors such as retail and institutional portfolios seeking preferred stock sector exposure without ESG screening. The fund follows the S&P U.S. Preferred Stock Index (formerly transitioned from ICE Data Services benchmark), measuring performance of qualified preferred stocks meeting investment criteria including market capitalization thresholds and liquidity standards. Recent portfolio management enhancements include the addition of co-portfolio managers Peter Sietsema, Matt Waldron, and Steven White effective April 1, 2025, alongside longstanding manager Jennifer Hsui; no major acquisitions, funding rounds, product launches, or strategic shifts specific to PFF have been reported in the last two years, maintaining its stable operational focus amid BlackRock's broader expansions in private credit.