iShares CMBS ETF (CMBS) Exchange: NYSE ARCA

The Fund seeks to track the investment results of the Bloomberg Barclays U.S. CMBS (ERISA Only) Index (the “Underlying Index”), which measures the performance of investment-grade (as determined by Bloomberg Index Services Limited (the “Index Provider” or “Bloomberg”)) commercial mortgage-backed securities (“CMBS”), which are classes of securities (known as “certificates”) that represent interests in “pools” of commercial mortgages. The Underlying Index includes only CMBS that are Employee Retirement Income Security Act of 1974, as amended (“ERISA”) eligible under the underwriter’s exemption, which will deem ERISA eligible the certificates with the first priority of principal repayment, as long as certain conditions are met, including the requirement that the certificates be rated in one of the three highest rating categories by Fitch Ratings, Inc., Moody's Investors Service, Inc. or S&P Global Ratings.The Underlying Index includes investment-grade CMBS that are ERISA eligible with $300 million or more of aggregate outstanding transaction size. In addition, the original aggregate transaction must be $500 million or more and the tranche size must be $25 million or more. CMBS certificates must have an expected life of at least one year and must be either fixed-rate or subject to an interest rate cap equal to the weighted average coupon of the underlying asset pool. Excluded from the Underlying Index are non-ERISA eligible securities, agency transactions and privately issued securities, including those which may be resold in accordance with Rule 144A under the Securities Act of 1933, as amended (the “1933 Act”). The securities in the Underlying Index are updated on the last calendar day of each month.BFA uses a “passive” or indexing approach to try to achieve the Fund’s investment objective. Unlike many investment companies, the Fund does not try to “beat” the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued.Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor security selection. Indexing seeks to achieve lower costs and better after-tax performance by aiming to keep portfolio turnover low in comparison to actively managed investment companies.BFA uses a representative sampling indexing strategy to manage the Fund. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities that collectively has an investment profile similar to that of an applicable underlying index. The securities selected are expected to have, in the aggregate, investment characteristics (based on factors such as market value and industry weightings), fundamental characteristics (such as return variability, duration, maturity, credit ratings and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the securities in the Underlying Index.The Fund generally will invest at least 90% of its assets in the component securities of the Underlying Index and may invest up to 10% of its assets in certain futures, options and swap contracts, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates (“BlackRock Cash Funds”), as well as in securities not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. From time to time when conditions warrant, however, the Fund may invest at least 80% of its assets in the component securities of the Underlying Index and may invest up to 20% of its assets in certain futures, options and swap contracts, cash and cash equivalents, including shares of BlackRock Cash Funds, as well as in securities not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund.The Underlying Index is sponsored by Bloomberg, which is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index.Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities), repurchase agreements collateralized by U.S. government securities, and securities of state or municipal governments and their political subdivisions are not considered to be issued by members of any industry.