BTC iShares Morningstar Multi-Asset Income ETF (IYLD) Exchange: BATS

The Fund is a fund-of-funds and seeks to achieve its investment objective by investing primarily in the securities of the Underlying Funds that themselves seek investment results corresponding to their own underlying indexes. The Fund invests in a combination of Underlying Funds and may also invest in other exchange-traded funds (“ETFs”) (including other iShares funds), U.S. government securities, short-term paper, futures contracts, options on futures contracts, options, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates (“BlackRock Cash Funds”).The Morningstar® Multi-Asset High Income IndexSM (the “Underlying Index”) is broadly diversified and seeks to deliver high current income while maintaining long-term capital appreciation.  The goal of the Underlying Index is to represent an allocation strategy to distinct asset classes of 20% equities, 60% fixed-income and 20% in an “alternative income sources” asset class, which consists of Underlying Funds that the index provider, Morningstar, Inc. (“Morningstar” or the “Index Provider”), considers to exhibit both equity and fixed-income-like characteristics. Each asset class has its own risk profile. The Underlying Index is rebalanced and reconstituted quarterly. The Underlying Index is comprised of Underlying Funds within these asset classes that have demonstrated relatively high income on a consistent basis and meet liquidity characteristics as determined by Morningstar's proprietary index methodology.The 20% equity allocation consists of Underlying Funds that invest primarily in U.S. and non-U.S. equities. The 60% fixed-income allocation consists of Underlying Funds that invest primarily in U.S. and non-U.S. fixed-income securities. The 20% alternative income source allocation generally consists of Underlying Funds that invest primarily in real estate investment trusts (“REITs”) and preferred stocks. When the combined allocation percentages equal less than 100%, the Fund may invest the remainder of its assets in BlackRock Cash Funds. Investments in Underlying Funds that have significant non-U.S. currency exposure will not exceed 25% of the weight of the Underlying Index.As of July 31, 2019, the Underlying Index included the following Underlying Funds within the equity asset class: iShares Core High Dividend ETF, iShares Select Dividend ETF and iShares International Select Dividend ETF; the following Underlying Funds within the fixed-income asset class: iShares iBoxx $ High Yield Corporate Bond ETF, iShares Intermediate-Term Corporate Bond ETF, iShares J.P. Morgan EM Local Currency Bond ETF, iShares J.P. Morgan USD Emerging Markets Bond ETF and iShares Long-Term Corporate Bond ETF; and the following Underlying Funds within the alternatives asset class: iShares Mortgage Real Estate ETF and iShares Preferred and Income Securities ETF. The Underlying Index may add, eliminate or replace Underlying Funds at any time. As of July 31, 2019, a significant portion of the Underlying Index is represented by securities of companies in the financials industry or sector. The components of the Underlying Index are likely to change over time.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 capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of an applicable underlying index. The Fund and an Underlying Fund may or may not hold all of the securities in the applicable 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, 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 Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any collateral received).The Underlying Index is sponsored by Morningstar 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) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.