iShares Mortgage Real Estate ETF(CBOE:REM)

REM holds a broad, concentrated portfolio of residential and commercial mortgage REITs that mirrors the broad neutral benchmark for the mortgage REIT space. Constituent eligibility for its Underlying Index is subject to five screens, namely: size, liquidity, invested assets, free float and Unrelated Business Taxable Income (UBTI) screen. A capping methodology is also utilized in which Index constituents are capped at a 22.5% weight and rebalanced on a quarterly basis. Furthermore, constituents that are classified as Savings Associations or Mortgage Finance are included in the funds reserve list and will be added to the Index only when the number of constituents falls below 20. Each constituent will then be capped at 3% individually and 30% in aggregate.