Unlike the ticker would indicate, REZ is a multisector real estate fund, which invests in a broad spectrum of US REIT securities. Prior to September 18, 2020, the fund focused on just residential iShares Residential Real Estate ETF. The Underlying index includes all market-caps and is part of the FTSE Nareit US Real Estate Capped Index Series and includes both domestic real estate stocks and real estate investment trusts from the following sub-sectors: apartments, manufactured homes, health care, self-storage, and single-family homes. The index undergoes a quarterly review and applies a 22.5% cap per stock, with stocks above 5% not exceeding 45%.