2021 PROSPECTUS - BLACKROCK

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Table of Contents

                                                                              MARCH 1, 2021

                                                                      (as revised April 1, 2021)

              2021 Prospectus

         iShares Trust
         • iShares iBonds 2022 Term High Yield and Income ETF* | IBHB | CBOE BZX

         The SEC has not approved or disapproved these securities or passed upon the
         adequacy of this prospectus. Any representation to the contrary is a criminal offense.
         *The iShares iBonds 2022 Term High Yield and Income ETF may also conduct business
         as the iBonds 2022 Term High Yield and Income ETF.
Table of Contents
iShares®
                             iShares Trust
                        iShares U.S. ETF Trust
       Supplement dated August 24, 2021 (the “Supplement”)
      to the Summary Prospectus (the “Summary Prospectus”),
                  Prospectus (the “Prospectus”) and
             Statement of Additional Information (“SAI”)
     for each of the Funds listed in Appendix A (each, a “Fund”)
The information in this Supplement updates information in, and
should be read in conjunction with, each Fund’s Summary
Prospectus, Prospectus and SAI.
References to the name of the Underlying Index in the Summary
Prospectus, Prospectus, and SAI for each Fund except for the
BlackRock Short Maturity Bond ETF and BlackRock Short Maturity
Municipal Bond ETF are hereby revised as follows:
  Former Underlying Index Name         New Underlying Index Name
Bloomberg Barclays 2021 Term         Bloomberg 2021 Term High
High Yield and Income Index          Yield and Income Index
Bloomberg Barclays 2022 Term         Bloomberg 2022 Term High
High Yield and Income Index          Yield and Income Index
Bloomberg Barclays 2023 Maturity     Bloomberg 2023 Maturity
Corporate Index                      Corporate Index
Bloomberg Barclays 2023 Maturity     Bloomberg 2023 Maturity High
High Quality Corporate Index         Quality Corporate Index
Bloomberg Barclays 2023 Term         Bloomberg 2023 Term High
High Yield and Income Index          Yield and Income Index
Bloomberg Barclays 2024 Term         Bloomberg 2024 Term High
High Yield and Income Index          Yield and Income Index
Bloomberg Barclays 2025 Term         Bloomberg 2025 Term High
High Yield and Income Index          Yield and Income Index
Bloomberg Barclays 2026 Term         Bloomberg 2026 Term High
High Yield and Income Index          Yield and Income Index
Bloomberg Barclays 2027 Term         Bloomberg 2027 Term High
High Yield and Income Index          Yield and Income Index
Bloomberg Barclays December          Bloomberg December 2021
2021 Maturity Corporate Index        Maturity Corporate Index
Bloomberg Barclays December          Bloomberg December 2022
2022 Maturity Corporate Index        Maturity Corporate Index
Former Underlying Index Name      New Underlying Index Name
Bloomberg Barclays December       Bloomberg December 2023
2023 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2024
2024 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2025
2025 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2026
2026 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2027
2027 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2028
2028 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2029
2029 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2030
2030 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays December       Bloomberg December 2031
2031 Maturity Corporate Index     Maturity Corporate Index
Bloomberg Barclays Global         Bloomberg Global Aggregate ex
Aggregate ex USD 10% Issuer       USD 10% Issuer Capped
Capped (Hedged) Index             (Hedged) Index
Bloomberg Barclays MSCI Global    Bloomberg MSCI Global Green
Green Bond Select (USD Hedged)    Bond Select (USD Hedged) Index
Index
Bloomberg Barclays MSCI US        Bloomberg MSCI US Aggregate
Aggregate ESG Focus Index         ESG Focus Index
Bloomberg Barclays MSCI US        Bloomberg MSCI US Corporate
Corporate 1-5 Year ESG Focus      1-5 Year ESG Focus Index
Index
Bloomberg Barclays MSCI US        Bloomberg MSCI US Corporate
Corporate ESG Focus Index         ESG Focus Index
Bloomberg Barclays MSCI US High   Bloomberg MSCI US High Yield
Yield Choice ESG Screened Index   Choice ESG Screened Index
Bloomberg Barclays MSCI US        Bloomberg MSCI US Universal
Universal Choice ESG Screened     Choice ESG Screened Index
Index
Bloomberg Barclays U.S. Agency    Bloomberg U.S. Agency Bond
Bond Index                        Index
Former Underlying Index Name        New Underlying Index Name
Bloomberg Barclays U.S. CMBS        Bloomberg U.S. CMBS (ERISA
(ERISA Only) Index                  Only) Index
Bloomberg Barclays U.S.             Bloomberg U.S. Convertible Cash
Convertible Cash Pay Bond >         Pay Bond > $250MM Index
$250MM Index
Bloomberg Barclays U.S. Corporate   Bloomberg U.S. Corporate Aaa -
Aaa - A Capped Index                A Capped Index
Bloomberg Barclays U.S. Fixed       Bloomberg U.S. Fixed Income
Income Balanced Risk Index          Balanced Risk Index
Bloomberg Barclays U.S. GNMA        Bloomberg U.S. GNMA Bond
Bond Index                          Index
Bloomberg Barclays U.S.             Bloomberg U.S. Government/
Government/Credit Bond Index        Credit Bond Index
Bloomberg Barclays U.S.             Bloomberg U.S. Intermediate
Intermediate Government/Credit      Government/Credit Bond Index
Bond Index
Bloomberg Barclays U.S. Treasury    Bloomberg U.S. Treasury
Inflation Protected Securities      Inflation Protected Securities
(TIPS) Index (Series-L)             (TIPS) Index (Series-L)
Bloomberg Barclays U.S. Treasury    Bloomberg U.S. Treasury
Inflation-Protected Securities      Inflation-Protected Securities
(TIPS) 0-5 Years Index (Series-L)   (TIPS) 0-5 Years Index (Series-L)
Bloomberg Barclays U.S. Universal   Bloomberg U.S. Universal
10+ Year Index                      10+ Year Index
Bloomberg Barclays U.S. Universal   Bloomberg U.S. Universal
1-5 Year Index                      1-5 Year Index
Bloomberg Barclays U.S. Universal   Bloomberg U.S. Universal Index
Index
Bloomberg Barclays U.S. Aggregate   Bloomberg U.S. Aggregate Bond
Bond Index                          Index
Bloomberg Barclays US Floating      Bloomberg US Floating Rate
Rate Note < 5 Years Index           Note < 5 Years Index
Bloomberg Barclays US High Yield    Bloomberg US High Yield Fallen
Fallen Angel 3% Capped Index        Angel 3% Capped Index
Bloomberg Barclays U.S. MBS
Index                               Bloomberg U.S. MBS Index
Bloomberg Barclays U.S. Treasury    Bloomberg U.S. Treasury
Floating Rate Bond Index            Floating Rate Bond Index
Bloomberg Barclays U.S. Universal   Bloomberg U.S. Universal
5-10 Year Index                     5-10 Year Index
References to the name of the benchmark index in the Summary
Prospectus, Prospectus and SAI for each of the BlackRock Short
Maturity Bond ETF and BlackRock Short Maturity Municipal Bond
ETF are revised as follows:
 Former Benchmark Index Name         New Benchmark Index Name
Bloomberg Barclays Short-Term      Bloomberg Short-Term
Government/Corporate Index         Government/Corporate Index
Bloomberg Barclays Municipal       Bloomberg Municipal Bond:
Bond: 1 Year (1-2) Index           1 Year (1-2) Index
Appendix A
                        iShares Trust Funds
Supplement to the Summary Prospectus, Prospectus and SAI each
dated as of March 1, 2021:
iShares Core Total USD Bond Market ETF
iShares iBonds Mar 2023 Term Corporate ex-Financials ETF
Supplement to the Summary Prospectus and Prospectus both dated
as of March 1, 2021, and to the SAI dated as of March 1, 2021 (as
revised April 1, 2021):
iShares 0-5 Year TIPS Bond ETF
iShares Aaa - A Rated Corporate Bond ETF
iShares CMBS ETF
iShares Convertible Bond ETF
iShares Core 1-5 Year USD Bond ETF
iShares Core International Aggregate Bond ETF
iShares ESG Advanced High Yield Corporate Bond ETF
iShares Fallen Angels USD Bond ETF
iShares Global Green Bond ETF
iShares GNMA Bond ETF
iShares iBonds Dec 2021 Term Corporate ETF
iShares iBonds Dec 2022 Term Corporate ETF
iShares iBonds Dec 2023 Term Corporate ETF
iShares iBonds Dec 2024 Term Corporate ETF
iShares iBonds Dec 2025 Term Corporate ETF
iShares iBonds Dec 2026 Term Corporate ETF
iShares iBonds Dec 2027 Term Corporate ETF
iShares iBonds Dec 2028 Term Corporate ETF
iShares iBonds Dec 2029 Term Corporate ETF
iShares iBonds Dec 2030 Term Corporate ETF
iShares iBonds Mar 2023 Term Corporate ETF
iShares TIPS Bond ETF
iShares Treasury Floating Rate Bond ETF
iShares U.S. Fixed Income Balanced Risk Factor ETF
Supplement to the Summary Prospectus, Prospectus and SAI each
dated as of March 1, 2021 (as revised April 1, 2021):
iShares iBonds 2021 Term High Yield and Income ETF
iShares iBonds 2022 Term High Yield and Income ETF
iShares iBonds 2023 Term High Yield and Income ETF
iShares iBonds 2024 Term High Yield and Income ETF
iShares iBonds 2025 Term High Yield and Income ETF
iShares iBonds 2026 Term High Yield and Income ETF
iShares Floating Rate Bond ETF
Supplement to the Summary Prospectus, Prospectus and SAI each
dated as of June 29, 2021:
iShares Agency Bond ETF
iShares Core 5-10 Year USD Bond ETF
iShares Core 10+ Year USD Bond ETF
iShares Core U.S. Aggregate Bond ETF
iShares ESG Advanced Total USD Bond Market ETF
iShares ESG Aware 1-5 Year USD Corporate Bond ETF
iShares ESG Aware U.S. Aggregate Bond ETF
iShares ESG Aware USD Corporate Bond ETF
iShares Government/Credit Bond ETF
iShares Intermediate Government/Credit Bond ETF
iShares MBS ETF
Supplement to the Summary Prospectus dated as of June 23, 2021,
Prospectus and SAI each dated as of June 15, 2021:
iShares iBonds Dec 2031 Term Corporate ETF
Supplement to the Summary Prospectus dated as of July 1, 2021 (as
revised July 7, 2021), Prospectus dated as of June 23, 2021 (as
revised July 7, 2021) and SAI dated as of June 23, 2021:
iShares iBonds 2027 Term High Yield and Income ETF
                           iShares U.S. ETF Trust Funds
Supplement to the Summary Prospectus and Prospectus both dated
as of March 1, 2021, and to the SAI dated as of March 1, 2021 (as
revised April 27, 2021):
BlackRock Short Maturity Bond ETF
BlackRock Short Maturity Municipal Bond ETF
If you have any questions, please call 1-800-iShares (1-800-474-2737).

iShares® is a registered trademark of BlackRock Fund Advisors and its affiliates.
                                                                           IS-A-BBG-0821

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                           FOR FUTURE REFERENCE
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Table of Contents

        Table of Contents
                        Fund Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               S-1
                        More Information About the Fund . . . . . . . . .                                              1
                        A Further Discussion of Principal Risks . .                                                    2
                        A Further Discussion of Other Risks . . . . . .                                              16
                        Portfolio Holdings Information . . . . . . . . . . . . .                                     21
                        Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               21
                        Shareholder Information . . . . . . . . . . . . . . . . . . . .                              24
                        Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         32
                        Financial Highlights . . . . . . . . . . . . . . . . . . . . . . . . . .                     33
                        Index Provider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             34
                        Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          34

        BLOOMBERG® is a trademark of Bloomberg Finance L.P. and its affiliates (collectively, “Bloomberg”).
        BARCLAYS® is a trademark of Barclays Bank PLC (collectively with its affiliates, “Barclays”), used under license.
        “Bloomberg Barclays 2022 Term High Yield and Income Index” is a trademark of Bloomberg and its licensors
        and has been licensed for use for certain purposes by BlackRock Fund Advisors or its affiliates. iShares®,
        iBonds® and BlackRock® are registered trademarks of BlackRock Fund Advisors and its affiliates. This Fund is
        covered by U.S. Patent Nos. 8,438,100 and 8,655,770.

                                                                i
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Table of Contents

        iSHARES® iBONDS® 2022 TERM HIGH YIELD
                   AND INCOME ETF
                          Ticker: IBHB                        Stock Exchange: Cboe BZX

        Investment Objective
        The iShares iBonds 2022 Term High Yield and Income ETF (the “Fund”) seeks to track
        the investment results of an index composed of U.S. dollar-denominated, high yield
        and other income generating corporate bonds maturing in 2022.

        Fees and Expenses
        The following table describes the fees and expenses that you will incur if you buy, hold
        and sell shares of the Fund. The investment advisory agreement between iShares Trust
        (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory
        Agreement”) provides that BFA will pay all operating expenses of the Fund, except the
        management fees, interest expenses, taxes, expenses incurred with respect to the
        acquisition and disposition of portfolio securities and the execution of portfolio
        transactions, including brokerage commissions, distribution fees or expenses, litigation
        expenses and any extraordinary expenses. The Fund may incur “Acquired Fund Fees
        and Expenses.” Acquired Fund Fees and Expenses reflect the Fund’s pro rata share of
        the fees and expenses incurred by investing in other investment companies. The
        impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund.
        Acquired Fund Fees and Expenses are not included in the calculation of the ratio of
        expenses to average net assets shown in the Financial Highlights section of the Fund’s
        prospectus (the “Prospectus”).
        You may pay other fees, such as brokerage commissions and other fees to financial
        intermediaries, which are not reflected in the tables and examples below.
                                                 Annual Fund Operating Expenses
                                          (ongoing expenses that you pay each year as a
                                           percentage of the value of your investments)

                                                                                                          Total Annual
                                                                                                              Fund
                         Distribution                    Acquired Fund     Total Annual                    Operating
                             and                             Fees              Fund                         Expenses
        Management      Service (12b-1)      Other            and           Operating                         After
           Fees              Fees          Expenses 1     Expenses1,2       Expenses      Fee Waiver1,2    Fee Waiver

          0.35%             None             0.00%           0.00%            0.35%         (0.00)%         0.35%

          1
              The amount rounded to 0.00%.
          2
              BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its
              management fees in an amount equal to the Acquired Fund Fees and Expenses, if any,
              attributable to investments by the Fund in other funds advised by BFA or its affiliates through
              the termination date of the Fund, on or about December 15, 2022. The contractual waiver may
              be terminated prior to the Fund’s termination only upon the written agreement of the Trust
              and BFA.

                                                              S-1
Table of Contents

        Example. This Example is intended to help you compare the cost of owning shares of
        the Fund with the cost of investing in other funds. The Example assumes that you
        invest $10,000 in the Fund for the time periods indicated and then sell all of your
        shares at the end of those periods. Fund expenses (and any applicable waivers) are
        calculated only through December 15, 2022 because the Fund is scheduled to cease
        operations and liquidate by that date. The Example also assumes that your investment
        has a 5% return each year and that the Fund’s operating expenses remain the same.
        Although your actual costs may be higher or lower, based on these assumptions, your
        costs would be:

                                  1 Year                           Maturity

                                   $36                               $65

        Portfolio Turnover. The Fund may pay               remaining net assets to shareholders
        transaction costs, such as commissions,            pursuant to a plan of liquidation. The
        when it buys and sells securities (or              Fund does not seek to return any
        “turns over” its portfolio). A higher              predetermined amount at maturity or in
        portfolio turnover rate may indicate               periodic distributions. The Underlying
        higher transaction costs and may result            Index is composed of U.S. dollar-
        in higher taxes when Fund shares are               denominated, taxable, fixed-rate, high
        held in a taxable account. These costs,            yield (which are considered below
        which are not reflected in the Annual              investment-grade) and BBB or
        Fund Operating Expenses or in the                  equivalently rated (as determined by
        Example, affect the Fund’s                         Bloomberg Index Services Limited (the
        performance. During the most recent                “Index Provider” or “Bloomberg”))
        fiscal year, the Fund’s portfolio turnover         corporate bonds scheduled to mature
        rate was 68% of the average value of its           between January 1, 2022 and December
        portfolio.                                         15, 2022, inclusive. Securities eligible
                                                           for inclusion in the Underlying Index are
        Principal Investment                               selected from a universe of corporate
        Strategies                                         issuers (e.g., industrial, financial
        The Fund seeks to meet its investment              institutions, utilities) determined by
        objective generally by investing in                Bloomberg. As of October 31, 2020, a
        component securities of the Bloomberg              significant portion of the Underlying
        Barclays 2022 Term High Yield and                  Index is represented by securities of
        Income Index (the “Underlying Index”).             companies in the communication
        The Fund may also invest in other                  services, consumer cyclical and
        exchange-traded funds (“ETFs”), U.S.               financials industries or sectors. The
        government securities, short-term                  components of the Underlying Index are
        paper, cash and cash equivalents,                  likely to change over time.
        including shares of money market funds             The bonds in the Underlying Index have
        advised by BFA or its affiliates.                  $250 million or more of outstanding
        The Fund is a term fund that will                  face value at the time of inclusion. The
        terminate on or about December 15,                 non-U.S. corporate issuers included in
        2022, at which time it will distribute its         the Underlying Index consist primarily of

                                                     S-2
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        corporate bonds issued by companies                qualify for inclusion (due to, among
        domiciled in developed countries. The              other factors, sector reclassifications of
        Fund will invest in non-U.S. issuers to            issuers, changes in the credit rating of
        the extent necessary for it to track the           bonds included in the Underlying Index
        Underlying Index. Each bond included in            or rebalances to maintain issuer limits),
        the Underlying Index must be registered            or decline in value compared to a
        with the SEC, have been exempt from                reference point set at 2.5 years from
        registration at issuance, or have been             the Underlying Index’s term or (2) if,
        offered pursuant to Rule 144A under the            prior to the last 2.5 years remaining in
        Securities Act of 1933, as amended (the            the Underlying Index’s term, the market
        “1933 Act”). Subject to the                        value of the high yield bonds in the
        methodology of the Underlying Index                Underlying Index declines below $30
        discussed below, the securities in the             billion, the Underlying Index will add
        Underlying Index may carry a coupon                BBB-rated bonds to maintain a $30
        that steps-up according to a                       billion minimum market value for the
        predetermined schedule (i.e., the                  Underlying Index. In the final year of the
        interest rate paid on such securities will         Underlying Index’s term, any principal
        increase over time). The Underlying                and interest paid by index constituents
        Index will be subject to issuer limits of          is treated as follows: (1) during the first
        3%, with any excess redistributed                  six months of the final year, the
        among the remaining constituents on a              Underlying Index reinvests proceeds
        pro-rata basis.                                    pro-rata into the remaining bonds in the
        The securities in the Underlying Index             Underlying Index, and (2) during the last
        are updated on the last calendar day of            six months of the final year, proceeds
        each month until six months before                 are not reinvested and are presumed to
        maturity, with the last rebalance date on          be held in cash while earning no
        June 30, 2022.                                     interest.
        The Underlying Index consists of bonds             Bonds with a clean price (i.e., the price
        chosen from two sub-indices, the                   does not include accrued interest
        Bloomberg Barclays U.S. High Yield                 between coupon payments) below $60
        Index (the “High Yield Index”) and the             at rebalance on or after April 1, 2021
        Bloomberg Barclays U.S. Corporate                  are permanently excluded from the
        Index (the “Corporate Index”), both of             Underlying Index.
        which are stripped of securities                   In addition, to be included in the
        maturing outside of the maturity range             Underlying Index, securities that are
        defined above. BBB-rated bonds from                rated by all three of the rating agencies
        the Corporate Index will be introduced             named below must be rated “high yield”
        to the Underlying Index under the                  to be selected from the High Yield Index
        following conditions: (1) in the last 2.5          and “BBB” to be selected from the
        years but before the last 6 months of              Corporate Index. The bonds from the
        the Underlying Index’s term, the                   High Yield Index must have a rating
        Underlying Index will introduce BBB-               equal to or below “Ba1”/”BB+”/”BB+”
        rated bonds (which are considered                  and above “CC”. The bonds from the
        investment-grade) as constituent high              Corporate Index must have a rating of
        yield bonds (which are considered below            “BBB” (or equivalent). The Index
        investment-grade) are called, no longer            Provider will use the middle rating of

                                                     S-3
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        Moody’s Investors Service, Inc.                   selected are expected to have, in the
        (“Moody’s”), Standard & Poor’s® Global            aggregate, investment characteristics
        Ratings, a subsidiary of S&P Global               (based on factors such as market value
        (“S&P Global Ratings”) and Fitch                  and industry weightings), fundamental
        Ratings, Inc. (“Fitch”); when a rating            characteristics (such as return
        from only two agencies is available, the          variability, duration, maturity, credit
        lower is used; when only one agency               ratings and yield) and liquidity measures
        rates a bond, that rating is used.                similar to those of an applicable
        The Fund is a series of the iShares               underlying index. The Fund may or may
        iBonds fixed maturity series of bond              not hold all of the securities in the
        ETFs sponsored by BlackRock, Inc.                 Underlying Index.
        (“BlackRock”). The iShares iBonds fixed           The Fund generally will invest at least
        maturity series do not invest in U.S.             90% of its assets in the component
        savings bonds or other U.S. government            securities of the Underlying Index,
        bonds (except to the extent the funds             except during the last months of the
        hold cash equivalent instruments                  Fund’s operations, as described below,
        consistent with their investment                  and may invest up to 10% of its assets
        objectives) and are not designed to               in certain futures, options and swap
        provide protection against inflation.             contracts, cash and cash equivalents,
        BFA uses a “passive” or indexing                  including shares of money market funds
        approach to try to achieve the Fund’s             advised by BFA or its affiliates
        investment objective. Unlike many                 (“BlackRock Cash Funds”), as well as in
        investment companies, the Fund does               securities not included in the Underlying
        not try to “beat” the index it tracks and         Index, but which BFA believes will help
        does not seek temporary defensive                 the Fund track the Underlying Index.
        positions when markets decline or                 From time to time when conditions
        appear overvalued.                                warrant, however, the Fund may invest
                                                          at least 80% of its assets in the
        Indexing may eliminate the chance that            component securities of the Underlying
        the Fund will substantially outperform            Index and may invest up to 20% of its
        the Underlying Index but also may                 assets in certain futures, options and
        reduce some of the risks of active                swap contracts, cash and cash
        management, such as poor security                 equivalents, including shares of
        selection. Indexing seeks to achieve              BlackRock Cash Funds, as well as in
        lower costs and better after-tax                  securities not included in the Underlying
        performance by aiming to keep portfolio           Index, but which BFA believes will help
        turnover low in comparison to actively            the Fund track the Underlying Index.
        managed investment companies.
                                                          The Fund seeks to track the investment
        BFA uses a representative sampling                results of the Underlying Index before
        indexing strategy to manage the Fund.             fees and expenses of the Fund. In the
        “Representative sampling” is an                   last six months of operation, as the
        indexing strategy that involves investing         bonds held by the Fund mature, the
        in a representative sample of securities          proceeds will not be reinvested by the
        that collectively has an investment               Fund in bonds but instead will be held in
        profile similar to that of an applicable          cash and cash equivalents. To the
        underlying index. The securities                  extent that the Fund invests in money

                                                    S-4
Table of Contents

        market or similar funds, it will incur the         Summary of Principal Risks
        fees and expenses of such funds. By
                                                           As with any investment, you could lose
        December 15, 2022, the Underlying
                                                           all or part of your investment in the
        Index is expected to consist almost
                                                           Fund, and the Fund’s performance could
        entirely of cash acquired in this manner.
                                                           trail that of other investments. The Fund
        On or around this date, the Fund will
                                                           is subject to certain risks, including the
        wind up and terminate, and its net
                                                           principal risks noted below, any of
        assets will be distributed to then-
                                                           which may adversely affect the Fund’s
        current shareholders pursuant to a plan
                                                           net asset value per share (“NAV”),
        of liquidation. The Fund should not be
                                                           trading price, yield, total return and
        confused with a target date fund, which
                                                           ability to meet its investment objective.
        has assets that are managed according
                                                           The order of the below risk factors does
        to a particular investment strategy that
                                                           not indicate the significance of any
        convert fund assets to conservative
                                                           particular risk factor.
        investments over time.
                                                           Asset Class Risk. Securities and other
        The Fund may lend securities
                                                           assets in the Underlying Index or in the
        representing up to one-third of the value
                                                           Fund’s portfolio may underperform in
        of the Fund’s total assets (including the
                                                           comparison to the general financial
        value of any collateral received).
                                                           markets, a particular financial market or
        The Underlying Index is sponsored by               other asset classes.
        Bloomberg, which is independent of the
                                                           Assets Under Management (AUM)
        Fund and BFA. The Index Provider
                                                           Risk. From time to time, an Authorized
        determines the composition and relative
                                                           Participant (as defined in the Creations
        weightings of the securities in the
                                                           and Redemptions section of this
        Underlying Index and publishes
                                                           prospectus (the “Prospectus”)), a third-
        information regarding the market value
                                                           party investor, the Fund’s adviser or an
        of the Underlying Index.
                                                           affiliate of the Fund’s adviser, or a fund
        Industry Concentration Policy. The                 may invest in the Fund and hold its
        Fund will concentrate its investments              investment for a specific period of time
        (i.e., hold 25% or more of its total               to allow the Fund to achieve size or
        assets) in a particular industry or group          scale. There can be no assurance that
        of industries to approximately the same            any such entity would not redeem its
        extent that the Underlying Index is                investment or that the size of the Fund
        concentrated. For purposes of this                 would be maintained at such levels,
        limitation, securities of the U.S.                 which could negatively impact the Fund.
        government (including its agencies and
                                                           Authorized Participant Concentration
        instrumentalities), repurchase
                                                           Risk. Only an Authorized Participant
        agreements collateralized by U.S.
                                                           may engage in creation or redemption
        government securities, and securities of
                                                           transactions directly with the Fund, and
        state or municipal governments and
                                                           none of those Authorized Participants is
        their political subdivisions are not
                                                           obligated to engage in creation and/or
        considered to be issued by members of
                                                           redemption transactions. The Fund has
        any industry.
                                                           a limited number of institutions that
                                                           may act as Authorized Participants on
                                                           an agency basis (i.e., on behalf of other

                                                     S-5
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        market participants). To the extent that          Consumer Cyclical Industry Risk.
        Authorized Participants exit the                  Consumer cyclical companies rely
        business or are unable to proceed with            heavily on business cycles and
        creation or redemption orders with                economic conditions. Consumer cyclical
        respect to the Fund and no other                  companies may be adversely affected
        Authorized Participant is able to step            by domestic and international economic
        forward to create or redeem, Fund                 downturns, changes in exchange and
        shares may be more likely to trade at a           interest rates, competition, consumers’
        premium or discount to NAV and                    disposable income and preferences,
        possibly face trading halts or delisting.         social trends and marketing campaigns.
        Call Risk. During periods of falling              Credit Risk. Debt issuers and other
        interest rates, an issuer of a callable           counterparties may be unable or
        bond held by the Fund may “call” or               unwilling to make timely interest and/or
        repay the security before its stated              principal payments when due or
        maturity, and the Fund may have to                otherwise honor their obligations.
        reinvest the proceeds in securities with          Changes in an issuer’s credit rating or
        lower yields, which would result in a             the market’s perception of an issuer’s
        decline in the Fund’s income, or in               creditworthiness may also adversely
        securities with greater risks or with             affect the value of the Fund’s
        other less favorable features.                    investment in that issuer. The degree of
        Communication Services Sector Risk.               credit risk depends on an issuer’s or
        Companies in the communications                   counterparty’s financial condition and
        sector may be affected by industry                on the terms of an obligation.
        competition, substantial capital                  Cybersecurity Risk. Failures or
        requirements, government regulation,              breaches of the electronic systems of
        cyclicality of revenues and earnings,             the Fund, the Fund’s adviser, distributor,
        obsolescence of communications                    the Index Provider and other service
        products and services due to                      providers, market makers, Authorized
        technological advancement, a potential            Participants or the issuers of securities
        decrease in the discretionary income of           in which the Fund invests have the
        targeted individuals and changing                 ability to cause disruptions, negatively
        consumer tastes and interests.                    impact the Fund’s business operations
        Concentration Risk. The Fund may be               and/or potentially result in financial
        susceptible to an increased risk of loss,         losses to the Fund and its shareholders.
        including losses due to adverse events            While the Fund has established business
        that affect the Fund’s investments more           continuity plans and risk management
        than the market as a whole, to the                systems seeking to address system
        extent that the Fund’s investments are            breaches or failures, there are inherent
        concentrated in the securities and/or             limitations in such plans and systems.
        other assets of a particular issuer or            Furthermore, the Fund cannot control
        issuers, country, group of countries,             the cybersecurity plans and systems of
        region, market, industry, group of                the Fund’s Index Provider and other
        industries, sector, market segment or             service providers, market makers,
        asset class.                                      Authorized Participants or issuers of
                                                          securities in which the Fund invests.

                                                    S-6
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        Declining Yield Risk. During the six               at the time of your investment. For
        months prior to the Fund’s planned                 example, at times during the Fund’s
        termination date, the Fund’s yield will            existence it may make distributions at a
        generally tend to move toward                      greater (or lesser) rate than the coupon
        prevailing money market rates and may              payments received on the Fund’s
        be lower than the yields of the bonds              portfolio, which would result in the Fund
        previously held by the Fund and lower              returning a lesser (or greater) amount
        than prevailing yields for bonds in the            on liquidation than would otherwise be
        market.                                            the case. The rate of Fund distribution
        Financials Sector Risk. Performance of             payments may adversely affect the tax
        companies in the financials sector may             characterization of your returns from an
        be adversely impacted by many factors,             investment in the Fund relative to a
        including, among others, changes in                direct investment in bonds. If the
        government regulations, economic                   amount you receive as liquidation
        conditions, and interest rates, credit             proceeds upon the Fund’s termination is
        rating downgrades, and decreased                   higher or lower than your cost basis,
        liquidity in credit markets. The extent to         you may experience a gain or loss for
        which the Fund may invest in a company             tax purposes.
        that engages in securities-related                 High Yield Securities Risk. Securities
        activities or banking is limited by                that are rated below investment-grade
        applicable law. The impact of changes in           (commonly referred to as “junk bonds,”
        capital requirements and recent or                 which may include those bonds rated
        future regulation of any individual                below “BBB-” by S&P Global Ratings and
        financial company, or of the financials            Fitch, or below “Baa3” by Moody’s), or
        sector as a whole, cannot be predicted.            are unrated, may be deemed
        In recent years, cyberattacks and                  speculative, may involve greater levels
        technology malfunctions and failures               of risk than higher-rated securities of
        have become increasingly frequent in               similar maturity and may be more likely
        this sector and have caused significant            to default. BBB-rated bonds, although
        losses to companies in this sector,                investment-grade, may share some of
        which may negatively impact the Fund.              the same speculative characteristics as
        Fluctuation of Yield and Liquidation               “junk bonds.”
        Amount Risk. The Fund, unlike a direct             Illiquid Investments Risk. The Fund
        investment in a bond that has a level              may invest up to an aggregate amount
        coupon payment and a fixed payment at              of 15% of its net assets in illiquid
        maturity, will make distributions of               investments. An illiquid investment is
        income that vary over time. It is                  any investment that the Fund
        expected that an investment in the                 reasonably expects cannot be sold or
        Fund, if held through maturity, will               disposed of in current market
        produce aggregate returns comparable               conditions in seven calendar days or
        to a direct investment in a group of               less without significantly changing the
        bonds of similar credit quality and                market value of the investment. To the
        maturity. Unlike a direct investment in            extent the Fund holds illiquid
        bonds, the breakdown of returns                    investments, the illiquid investments
        between Fund distributions and                     may reduce the returns of the Fund
        liquidation proceeds are not predictable           because the Fund may be unable to

                                                     S-7
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        transact at advantageous times or                    index computations or the construction
        prices. During periods of market                     of the Underlying Index in accordance
        volatility, liquidity in the market for the          with its methodology may occur from
        Fund’s shares may be impacted by the                 time to time and may not be identified
        liquidity in the market for the underlying           and corrected by the Index Provider for
        securities or instruments held by the                a period of time or at all, which may
        Fund, which could lead to the Fund’s                 have an adverse impact on the Fund and
        shares trading at a premium or discount              its shareholders. To the extent that the
        to the Fund’s NAV.                                   Underlying Index includes a non-
        Income Risk. The Fund’s income may                   standard methodology, errors in index
        decline if interest rates fall. This decline         data, index computation or the
        in income can occur because the Fund                 construction of the Underlying Index
        may subsequently invest in lower-                    may be more likely to occur. Unusual
        yielding instruments as bonds in its                 market conditions may cause the Index
        portfolio mature, are near maturity or               Provider to postpone a scheduled
        are called, bonds in the Underlying                  rebalance, which could cause the
        Index are substituted, or the Fund                   Underlying Index to vary from its normal
        otherwise needs to purchase additional               or expected composition.
        bonds. As the Fund does not seek to                  Infectious Illness Risk. An outbreak of
        return any predetermined amount at                   an infectious respiratory illness, COVID-
        maturity or in periodic distributions, the           19, caused by a novel coronavirus has
        amount of income generated by the                    resulted in travel restrictions, disruption
        Fund may vary during its term or when                of healthcare systems, prolonged
        the BBB-rated bonds are added to the                 quarantines, cancellations, supply chain
        Underlying Index as constituent high                 disruptions, lower consumer demand,
        yield bonds are called, no longer qualify            layoffs, ratings downgrades, defaults
        for inclusion or decline in value                    and other significant economic impacts.
        compared to a reference point. Such                  Certain markets have experienced
        change may result in a net decrease in               temporary closures, extreme volatility,
        the average yield of bonds held by the               severe losses, reduced liquidity and
        Fund. In addition, the Fund’s income is              increased trading costs. These events
        expected to decline in the months                    will have an impact on the Fund and its
        leading up to its maturity date because              investments and could impact the
        its portfolio will increasingly consist of           Fund’s ability to purchase or sell
        cash and cash equivalents.                           securities or cause elevated tracking
        Index-Related Risk. There is no                      error and increased premiums or
        guarantee that the Fund’s investment                 discounts to the Fund’s NAV. Other
        results will have a high degree of                   infectious illness outbreaks in the future
        correlation to those of the Underlying               may result in similar impacts.
        Index or that the Fund will achieve its              Interest Rate Risk. During periods of
        investment objective. Market                         very low or negative interest rates, the
        disruptions and regulatory restrictions              Fund may be unable to maintain positive
        could have an adverse effect on the                  returns or pay dividends to Fund
        Fund’s ability to adjust its exposure to             shareholders. Very low or negative
        the required levels in order to track the            interest rates may magnify interest rate
        Underlying Index. Errors in index data,              risk. Changing interest rates, including

                                                       S-8
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        rates that fall below zero, may have                global events such as war, acts of
        unpredictable effects on markets, result            terrorism, the spread of infectious
        in heightened market volatility and                 illness or other public health issues,
        detract from the Fund’s performance to              recessions, or other events could have a
        the extent the Fund is exposed to such              significant impact on the Fund and its
        interest rates. Additionally, under                 investments and could result in
        certain market conditions in which                  increased premiums or discounts to the
        interest rates are low and the market               Fund’s NAV.
        prices for portfolio securities have                Market Trading Risk. The Fund faces
        increased, the Fund may have a very                 numerous market trading risks,
        low, or even negative yield. A low or               including the potential lack of an active
        negative yield would cause the Fund to              market for Fund shares, losses from
        lose money in certain conditions and                trading in secondary markets, periods of
        over certain time periods. An increase in           high volatility and disruptions in the
        interest rates will generally cause the             creation/redemption process. ANY OF
        value of securities held by the Fund to             THESE FACTORS, AMONG OTHERS,
        decline, may lead to heightened                     MAY LEAD TO THE FUND’S SHARES
        volatility in the fixed-income markets              TRADING AT A PREMIUM OR DISCOUNT
        and may adversely affect the liquidity of           TO NAV.
        certain fixed-income investments,
        including those held by the Fund. The               Non-Diversification Risk. The Fund
        historically low interest rate                      may invest a large percentage of its
        environment heightens the risks                     assets in securities issued by or
        associated with rising interest rates.              representing a small number of issuers.
                                                            As a result, the Fund’s performance may
        Issuer Risk. The performance of the                 depend on the performance of a small
        Fund depends on the performance of                  number of issuers.
        individual securities to which the Fund
        has exposure. The Fund may be                       Operational Risk. The Fund is exposed
        adversely affected if an issuer of                  to operational risks arising from a
        underlying securities held by the Fund is           number of factors, including, but not
        unable or unwilling to repay principal or           limited to, human error, processing and
        interest when due. Changes to the                   communication errors, errors of the
        financial condition or credit rating of an          Fund’s service providers, counterparties
        issuer of those securities may cause the            or other third-parties, failed or
        value of the securities to decline.                 inadequate processes and technology
                                                            or systems failures. The Fund and BFA
        Management Risk. As the Fund will not               seek to reduce these operational risks
        fully replicate the Underlying Index, it is         through controls and procedures.
        subject to the risk that BFA’s                      However, these measures do not
        investment strategy may not produce                 address every possible risk and may be
        the intended results.                               inadequate to address significant
        Market Risk. The Fund could lose                    operational risks.
        money over short periods due to short-              Passive Investment Risk. The Fund is
        term market movements and over                      not actively managed, and BFA generally
        longer periods during more prolonged                does not attempt to take defensive
        market downturns. Local, regional or

                                                      S-9
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        positions under any market conditions,              does not meet certain conditions of the
        including declining markets.                        listing exchange. Any resulting
        Reinvestment Risk. The Fund may                     liquidation of the Fund could cause the
        invest a portion of its assets in short-            Fund to incur elevated transaction costs
        term fixed-income instruments and, as a             for the Fund and negative tax
        result, may be adversely affected if                consequences for its shareholders.
        interest rates fall because it may have             Tracking Error Risk. The Fund may be
        to invest in lower-yielding                         subject to tracking error, which is the
        instruments as bonds in the Fund’s                  divergence of the Fund’s performance
        portfolio mature.                                   from that of the Underlying Index.
        Reliance on Trading Partners Risk.                  Tracking error may occur because of
        The Fund invests in countries or regions            differences between the securities and
        whose economies are heavily                         other instruments held in the Fund’s
        dependent upon trading with key                     portfolio and those included in the
        partners. Any reduction in this trading             Underlying Index, pricing
        may have an adverse impact on the                   differences (including, as applicable,
        Fund’s investments. Through its                     differences between a security’s price
        holdings of securities of certain issuers,          at the local market close and the Fund’s
        the Fund is specifically exposed to                 valuation of a security at the time of
        Asian Economic Risk and North                       calculation of the Fund’s NAV),
        American Economic Risk.                             transaction costs incurred by the Fund,
                                                            the Fund’s holding of uninvested cash,
        Risk of Investing in the U.S. Certain               differences in timing of the accrual of or
        changes in the U.S. economy, such as                the valuation of distributions, the
        when the U.S. economy weakens or                    requirements to maintain pass-through
        when its financial markets decline, may             tax treatment, portfolio transactions
        have an adverse effect on the securities            carried out to minimize the distribution
        to which the Fund has exposure.                     of capital gains to shareholders,
        Securities Lending Risk. The Fund may               acceptance of custom baskets, changes
        engage in securities lending. Securities            to the Underlying Index or the costs to
        lending involves the risk that the Fund             the Fund of complying with various new
        may lose money because the borrower                 or existing regulatory requirements. This
        of the loaned securities fails to return            risk may be heightened during times of
        the securities in a timely manner or at             increased market volatility or other
        all. The Fund could also lose money in              unusual market conditions. Tracking
        the event of a decline in the value of              error also may result because the Fund
        collateral provided for loaned securities           incurs fees and expenses, while the
        or a decline in the value of any                    Underlying Index does not. INDEX ETFs
        investments made with cash collateral.              THAT TRACK INDICES WITH
        These events could also trigger adverse             SIGNIFICANT WEIGHT IN HIGH
        tax consequences for the Fund.                      YIELD SECURITIES MAY
                                                            EXPERIENCE HIGHER TRACKING
        Small Fund Risk. When the Fund’s size
                                                            ERROR THAN OTHER INDEX ETFs
        is small, the Fund may experience low
                                                            THAT DO NOT TRACK SUCH
        trading volume and wide bid/ask
                                                            INDICES.
        spreads. In addition, the Fund may face
        the risk of being delisted if the Fund

                                                     S-10
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        Valuation Risk. Because the bond                  portfolio may change on days or during
        market may be open on days or during              time periods when shareholders will not
        time periods when the Fund does not               be able to purchase or sell the Fund’s
        price its shares, the value of the                shares.
        securities or other assets in the Fund’s

        Performance Information
        The bar chart and table that follow show how the Fund has performed on a calendar
        year basis and provide an indication of the risks of investing in the Fund. Both assume
        that all dividends and distributions have been reinvested in the Fund. Past performance
        (before and after taxes) does not necessarily indicate how the Fund will perform in the
        future. If BFA had not waived certain Fund fees during certain periods, the Fund’s
        returns would have been lower.
                           Year by Year Returns (Year Ended December 31)

                      4%                            3.48%

                      3%

                      2%

                      1%

                      0%

                                                    2020
        The best calendar quarter return during the period shown above was 7.26% in the 2nd
        quarter of 2020; the worst was -10.34% in the 1st quarter of 2020.
        Updated performance information, including the Fund’s current NAV, may be obtained
        by visiting our website at www.iShares.com or by calling 1-800-iShares (1-800-474-
        2737) (toll free).

                                                   S-11
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                                       Average Annual Total Returns
                                (for the periods ended December 31, 2020)
                                                                                                  Since Fund
                                                                                     One Year      Inception
        (Inception Date: 5/7/2019)
           Return Before Taxes                                                         3.48%         3.42%
           Return After Taxes on Distributions1                                        1.15%         1.15%
           Return After Taxes on Distributions and Sale of Fund Shares1                1.99%         1.62%
        Bloomberg Barclays 2022 Term High Yield and Income Index
        (Index returns do not reflect deductions for fees, expenses, or taxes)         3.74%         4.02%

             1
                 After-tax returns in the table above are calculated using the historical highest individual
                 U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes.
                 Actual after-tax returns depend on an investor’s tax situation and may differ from those
                 shown, and after-tax returns shown are not relevant to tax-exempt investors or investors
                 who hold shares through tax-deferred arrangements, such as 401(k) plans or individual
                 retirement accounts (“IRAs”). Fund returns after taxes on distributions and sales of Fund
                 shares are calculated assuming that an investor has sufficient capital gains of the same
                 character from other investments to offset any capital losses from the sale of Fund shares.
                 As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed
                 Fund returns before taxes and/or returns after taxes on distributions.

                                                         S-12
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        Management                                           Tax Information
        Investment Adviser. BlackRock Fund                   The Fund intends to make distributions
        Advisors.                                            that may be taxable to you as ordinary
        Portfolio Managers. James Mauro and                  income or capital gains, unless you are
        Karen Uyehara (the “Portfolio                        investing through a tax-deferred
        Managers”) are primarily responsible for             arrangement such as a 401(k) plan or
        the day-to-day management of the                     an individual retirement account (“IRA”),
        Fund. Each Portfolio Manager                         in which case, your distributions
        supervises a portfolio management                    generally will be taxed when withdrawn.
        team. Mr. Mauro and Ms. Uyehara have                 Payments to Broker-Dealers
        been Portfolio Managers of the Fund
        since 2019 and 2021, respectively.
                                                             and Other Financial
                                                             Intermediaries
        Purchase and Sale of Fund                            If you purchase shares of the Fund
        Shares                                               through a broker-dealer or other
        The Fund is an ETF. Individual shares of             financial intermediary (such as a bank),
        the Fund may only be bought and sold in              BFA or other related companies may
        the secondary market through a broker-               pay the intermediary for marketing
        dealer. Because ETF shares trade at                  activities and presentations, educational
        market prices rather than at NAV,                    training programs, conferences, the
        shares may trade at a price greater than             development of technology platforms
        NAV (a premium) or less than NAV (a                  and reporting systems or other services
        discount). An investor may incur costs               related to the sale or promotion of the
        attributable to the difference between               Fund. These payments may create a
        the highest price a buyer is willing to              conflict of interest by influencing the
        pay to purchase shares of the Fund (bid)             broker-dealer or other intermediary and
        and the lowest price a seller is willing to          your salesperson to recommend the
        accept for shares of the Fund (ask)                  Fund over another investment. Ask your
        when buying or selling shares in the                 salesperson or visit your financial
        secondary market (the “bid-ask                       intermediary’s website for more
        spread”).                                            information.

                                                      S-13
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Table of Contents

        More Information About the Fund
        This Prospectus contains important information about investing in the Fund. Please
        read this Prospectus carefully before you make any investment decisions. Additional
        information regarding the Fund is available at www.iShares.com.
        BFA is the investment adviser to the Fund. Shares of the Fund are listed for trading on
        Cboe BZX Exchange, Inc. (“Cboe BZX”). The market price for a share of the Fund may
        be different from the Fund’s most recent NAV.
        ETFs are funds that trade like other publicly-traded securities. The Fund is designed to
        track an index. Similar to shares of an index mutual fund, each share of the Fund
        represents an ownership interest in an underlying portfolio of securities and other
        instruments intended to track a market index. Unlike shares of a mutual fund, which
        can be bought and redeemed from the issuing fund by all shareholders at a price based
        on NAV, shares of the Fund may be purchased or redeemed directly from the Fund at
        NAV solely by Authorized Participants and only in aggregations of a specified number of
        shares (“Creation Units”). Also unlike shares of a mutual fund, shares of the Fund are
        listed on a national securities exchange and trade in the secondary market at market
        prices that change throughout the day.
        The Fund will wind up and terminate on or about December 15, 2022. Upon its
        termination, the Fund will distribute substantially all of its net assets, after making
        appropriate provision for any liabilities of the Fund, to then-current shareholders
        pursuant to a plan of liquidation. In the final months of the Fund’s operations, as the
        bonds it holds mature, its portfolio will transition to cash and cash equivalents. As the
        Fund approaches its termination date, its holdings of money market or similar funds
        may increase, causing the Fund to incur the fees and expenses of these funds. By
        December 15, 2022, the Underlying Index value will be represented almost entirely by
        cash as no securities will remain in the Underlying Index. In accordance with the
        Trust’s current Agreement and Declaration of Trust, the Fund will terminate on or about
        the date noted above, as approved by a majority of the Trust’s Board of Trustees (the
        “Board”), without requiring additional approval by Fund shareholders. The Board may
        extend the termination date if a majority of the Board determines the extension to be
        in the best interest of the Fund.
        The Fund invests in a particular segment of the securities markets and seeks to track
        the performance of a securities index that is not representative of the market as a
        whole. The Fund is designed to be used as part of broader asset allocation strategies.
        Accordingly, an investment in the Fund should not constitute a complete investment
        program.
        An index is a financial calculation, based on a grouping of financial instruments, and is
        not an investment product, while the Fund is an actual investment portfolio. The
        performance of the Fund and the Underlying Index may vary for a number of reasons,
        including transaction costs, non-U.S. currency valuations, asset valuations, corporate
        actions (such as mergers and spin-offs), timing variances and differences between the
        Fund’s portfolio and the Underlying Index resulting from the Fund’s use of

                                                    1
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        representative sampling or from legal restrictions (such as diversification
        requirements) that apply to the Fund but not to the Underlying Index. From time to
        time, the Index Provider may make changes to the methodology or other adjustments
        to the Underlying Index. Unless otherwise determined by BFA, any such change or
        adjustment will be reflected in the calculation of the Underlying Index performance on
        a going-forward basis after the effective date of such change or adjustment. Therefore,
        the Underlying Index performance shown for periods prior to the effective date of any
        such change or adjustment will generally not be recalculated or restated to reflect
        such change or adjustment.
        “Tracking error” is the divergence of the Fund’s performance from that of the
        Underlying Index. Because the Fund uses a representative sampling indexing strategy,
        it can be expected to have a larger tracking error than if it used a replication indexing
        strategy. “Replication” is an indexing strategy in which a fund invests in substantially all
        of the securities in its underlying index in approximately the same proportions as in the
        underlying index.
        An investment in the Fund is not a bank deposit and it is not insured or guaranteed by
        the Federal Deposit Insurance Corporation or any other government agency, BFA or
        any of its affiliates.
        The Fund’s investment objective and the Underlying Index may be changed without
        shareholder approval.

        A Further Discussion of Principal Risks
        The Fund is subject to various risks, including the principal risks noted below, any of
        which may adversely affect the Fund’s NAV, trading price, yield, total return and ability
        to meet its investment objective. You could lose all or part of your investment in the
        Fund, and the Fund could underperform other investments. The order of the below risk
        factors does not indicate the significance of any particular risk factor.
        Asian Economic Risk. Many Asian economies have experienced rapid growth and
        industrialization in recent years, but there is no assurance that this growth rate will be
        maintained. Other Asian economies, however, have experienced high inflation, high
        unemployment, currency devaluations and restrictions, and over-extension of credit.
        Geopolitical hostility, political instability, and economic or environmental events in any
        one Asian country may have a significant economic effect on the entire Asian region,
        as well as on major trading partners outside Asia. Any adverse event in the Asian
        markets may have a significant adverse effect on some or all of the economies of the
        countries in which the Fund invests. In particular, China is a key trading partner of
        many Asian countries and any changes in trading relationships between China and
        other Asian countries may affect the region as a whole. Many Asian countries are
        subject to political risk, including political instability, corruption and regional conflict
        with neighboring countries. North Korea and South Korea each have substantial
        military capabilities, and historical tensions between the two countries present the risk
        of war. Escalated tensions involving the two countries and any outbreak of hostilities
        between the two countries, or even the threat of an outbreak of hostilities, could have
        a severe adverse effect on the entire Asian region. Certain Asian countries have
        developed increasingly strained relationships with the U.S., and if these relations were

                                                     2
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        to worsen, they could adversely affect Asian issuers that rely on the U.S. for trade. In
        addition, many Asian countries are subject to social and labor risks associated with
        demands for improved political, economic and social conditions. These risks, among
        others, may adversely affect the value of the Fund’s investments.
        Asset Class Risk. The securities and other assets in the Underlying Index or in the
        Fund’s portfolio may underperform in comparison to other securities or indexes that
        track other countries, groups of countries, regions, industries, groups of industries,
        markets, market segments, asset classes or sectors. Various types of securities,
        currencies and indexes may experience cycles of outperformance and
        underperformance in comparison to the general financial markets depending upon a
        number of factors including, among other things, inflation, interest rates, productivity,
        global demand for local products or resources, and regulation and governmental
        controls. This may cause the Fund to underperform other investment vehicles that
        invest in different asset classes.
        Assets Under Management (AUM) Risk. From time to time, an Authorized
        Participant, a third-party investor, the Fund’s adviser or an affiliate of the Fund’s
        adviser, or a fund may invest in the Fund and hold its investment for a specific period
        of time to allow the Fund to achieve size or scale. There can be no assurance that any
        such entity would not redeem its investment or that the size of the Fund would be
        maintained at such levels, which could negatively impact the Fund.
        Authorized Participant Concentration Risk. Only an Authorized Participant may
        engage in creation or redemption transactions directly with the Fund, and none of
        those Authorized Participants is obligated to engage in creation and/or redemption
        transactions. The Fund has a limited number of institutions that may act as Authorized
        Participants on an agency basis (i.e., on behalf of other market participants). To the
        extent that Authorized Participants exit the business or are unable to proceed with
        creation or redemption orders with respect to the Fund and no other Authorized
        Participant is able to step forward to create or redeem Creation Units, Fund shares
        may be more likely to trade at a premium or discount to NAV and possibly face trading
        halts or delisting. Authorized Participant concentration risk may be heightened
        because ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or
        other securities or instruments that are less widely traded often involve greater
        settlement and operational issues and capital costs for Authorized Participants, which
        may limit the availability of Authorized Participants.
        Call Risk. During periods of falling interest rates, an issuer of a callable bond held by
        the Fund may “call” or repay the security before its stated maturity, and the Fund may
        have to reinvest the proceeds in securities with lower yields, which would result in a
        decline in the Fund’s income, or in securities with greater risks or with other less
        favorable features.
        Communication Services Sector Risk. The communication services sector consists
        of both companies in the telecommunication services industry as well as those in the
        media and entertainment industry. Examples of companies in the telecommunication
        services industry group include providers of fiber-optic, fixed-line, cellular and wireless
        telecommunications networks. Companies in the media and entertainment industry
        group encompass a variety of services and products including television broadcasting,

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