2021 PROSPECTUS - BLACKROCK

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                                                                              MARCH 1, 2021

              2021 Prospectus

         iShares Trust
         • iShares iBonds Dec 2022 Term Corporate ETF* | IBDN | NYSE ARCA

         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 Dec 2022 Term Corporate ETF may also conduct business as the
         iBonds Dec 2022 Term Corporate ETF.
iShares®
                             iShares, Inc.
                            iShares Trust
                        iShares U.S. ETF Trust
      Supplement dated January 19, 2022 (the “Supplement”)
     to the Prospectus (the “Prospectus”) for each of the funds
        listed in Appendix A and Appendix B (each, a “Fund”)
The information in this Supplement updates information in, and
should be read in conjunction with, each Fund’s Prospectus.
Change in “Shareholder Information”

The last paragraph in the section of the Prospectus entitled “Buying
and Selling Shares” for each Fund listed in Appendix A is deleted in
its entirety and replaced with the following:
Section 12(d)(1) of the 1940 Act generally restricts investments by
investment companies, including foreign and unregistered investment
companies, in the securities of other investment companies. For
example, a registered investment company (the “Acquired Fund”), such
as the Fund, may not knowingly sell or otherwise dispose of any
security issued by the Acquired Fund to any investment company (the
“Acquiring Fund”) or any company or companies controlled by the
Acquiring Fund if, immediately after such sale or disposition: (i) more
than 3% of the total outstanding voting stock of the Acquired Fund is
owned by the Acquiring Fund and any company or companies
controlled by the Acquiring Fund or (ii) more than 10% of the total
outstanding voting stock of the Acquired Fund is owned by the
Acquiring Fund and other investment companies and companies
controlled by them. Although SEC rules may permit registered
investment companies and unit investment trusts (“Investing Funds”)
that enter into an investment agreement with the Trust to invest in
iShares funds beyond the limits set forth in Section 12(d)(1) of the 1940
Act subject to certain terms and conditions, the Fund does not permit
such investments. Accordingly, Investing Funds must adhere to the
limits set forth in Section 12(d)(1) of the 1940 Act when investing in the
Fund. In addition, foreign investment companies are permitted to invest
in the Fund only up to the limits set forth in Section 12(d)(1), subject to
any applicable SEC no-action relief.
The last paragraph in the section of the Prospectus entitled “Buying
and Selling Shares” for each Fund listed in Appendix B is deleted in
its entirety and replaced with the following:
Section 12(d)(1) of the 1940 Act generally restricts investments by
investment companies, including foreign and unregistered investment
companies, in the securities of other investment companies. For
example, a registered investment company (the “Acquired Fund”), such
as the Fund, may not knowingly sell or otherwise dispose of any
security issued by the Acquired Fund to any investment company (the
“Acquiring Fund”) or any company or companies controlled by the
Acquiring Fund if, immediately after such sale or disposition: (i) more
than 3% of the total outstanding voting stock of the Acquired Fund is
owned by the Acquiring Fund and any company or companies
controlled by the Acquiring Fund, or (ii) more than 10% of the total
outstanding voting stock of the Acquired Fund is owned by the
Acquiring Fund and other investment companies and companies
controlled by them. However, registered investment companies are
permitted to invest in the Fund beyond the limits set forth in
Section 12(d)(1), subject to certain terms and conditions set forth in
SEC rules. In order for a registered investment company to invest in
shares of the Fund beyond the limitations of Section 12(d)(1) in reliance
on Rule 12d1-4 under the 1940 Act, the registered investment company
must, among other things, enter into an agreement with the Trust or
Company, as applicable. Foreign investment companies are permitted
to invest in the Fund only up to the limits set forth in Section 12(d)(1),
subject to any applicable SEC no-action relief.

                              Appendix A
Supplement to Prospectus dated as of July 30, 2021:
iShares Currency Hedged JPX-Nikkei 400 ETF (HJPX)
iShares Russell 2500 ETF (SMMD)

Supplement to Prospectus dated as of March 1, 2021:
iShares iBonds Mar 2023 Term Corporate ETF (IBDD)

Supplement to Prospectus dated as of March 1, 2021
BlackRock Short Maturity Municipal Bond ETF (MEAR)
iShares Yield Optimized Bond ETF (BYLD)
Supplement to Prospectus dated as of March 1, 2021 (as revised
December 1, 2021):
iShares Interest Rate Hedged Corporate Bond ETF (LQDH)
iShares Interest Rate Hedged Emerging Markets Bond ETF (EMBH)
iShares Interest Rate Hedged High Yield Bond ETF (HYGH)
iShares Interest Rate Hedged Long-Term Corporate Bond ETF (IGBH)

                           Appendix B
Supplement to Prospectus dated as of March 1, 2021:
BlackRock Short Maturity Bond ETF (NEAR)
iShares 0-5 Year High Yield Corporate Bond ETF (SHYG)
iShares 0-5 Year Investment Grade Corporate Bond ETF (SLQD)
iShares 1-3 Year International Treasury Bond ETF (ISHG)
iShares Aaa - A Rated Corporate Bond ETF (QLTA)
iShares Bloomberg Roll Select Commodity Strategy ETF (CMDY)
iShares Broad USD High Yield Corporate Bond ETF (USHY)
iShares CMBS ETF (CMBS)
iShares Convertible Bond ETF (ICVT)
iShares Core 1-5 Year USD Bond ETF (ISTB)
iShares Core International Aggregate Bond ETF (IAGG)
iShares Core Total USD Bond Market ETF (IUSB)
iShares ESG Advanced High Yield Corporate Bond ETF (HYXF)
iShares Fallen Angels USD Bond ETF (FALN)
iShares Gold Strategy ETF (IAUF)
iShares GSCI Commodity Dynamic Roll Strategy ETF (COMT)
iShares iBonds Dec 2022 Term Corporate ETF (IBDN)
iShares iBonds Dec 2022 Term Muni Bond ETF (IBMK)
iShares iBonds Dec 2022 Term Treasury ETF (IBTB)
iShares iBonds Dec 2023 Term Corporate ETF (IBDO)
iShares iBonds Dec 2023 Term Muni Bond ETF (IBML)
iShares iBonds Dec 2023 Term Treasury ETF (IBTD)
iShares iBonds Dec 2024 Term Corporate ETF (IBDP)
iShares iBonds Dec 2024 Term Muni Bond ETF (IBMM)
iShares iBonds Dec 2024 Term Treasury ETF (IBTE)
iShares iBonds Dec 2025 Term Corporate ETF (IBDQ)
iShares iBonds Dec 2025 Term Muni Bond ETF (IBMN)
iShares iBonds Dec 2025 Term Treasury ETF (IBTF)
iShares iBonds Dec 2026 Term Corporate ETF (IBDR)
iShares iBonds Dec 2026 Term Muni Bond ETF (IBMO)
iShares iBonds Dec 2026 Term Treasury ETF (IBTG)
iShares iBonds Dec 2027 Term Corporate ETF (IBDS)
iShares iBonds Dec 2027 Term Muni Bond ETF (IBMP)
iShares iBonds Dec 2027 Term Treasury ETF (IBTH)
iShares iBonds Dec 2028 Term Muni Bond ETF (IBMQ)
iShares iBonds Dec 2028 Term Treasury ETF (IBTI)
iShares iBonds Dec 2029 Term Corporate ETF (IBDU)
iShares iBonds Dec 2029 Term Treasury ETF (IBTJ)
iShares iBonds Dec 2030 Term Corporate ETF (IBDV)
iShares iBonds Dec 2030 Term Treasury ETF (IBTK)
iShares iBonds Mar 2023 Term Corporate ex-Financials ETF (IBCE)
iShares International High Yield Bond ETF (HYXU)
iShares International Treasury Bond ETF (IGOV)
iShares J.P. Morgan EM Corporate Bond ETF (CEMB)
iShares J.P. Morgan EM High Yield Bond ETF (EMHY)
iShares J.P. Morgan USD Emerging Markets Bond ETF (EMB)
iShares TIPS Bond ETF (TIP)
iShares Treasury Floating Rate Bond ETF (TFLO)
iShares U.S. Fixed Income Balanced Risk Factor ETF (FIBR)
iShares US & Intl High Yield Corp Bond ETF (GHYG)
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-12d1-4-0122

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                           FOR FUTURE REFERENCE
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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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 . . . . . .                                              13
                        Portfolio Holdings Information . . . . . . . . . . . . .                                     17
                        Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               18
                        Shareholder Information . . . . . . . . . . . . . . . . . . . .                              21
                        Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         28
                        Financial Highlights . . . . . . . . . . . . . . . . . . . . . . . . . .                     29
                        Index Provider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             30
                        Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          30

        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 December 2022 Maturity Corporate 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.

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                         iSHARES® iBONDS® DEC 2022
                             TERM CORPORATE ETF
                          Ticker: IBDN                         Stock Exchange: NYSE Arca

        Investment Objective
        The iShares iBonds Dec 2022 Term Corporate ETF (the “Fund”) seeks to track the
        investment results of an index composed of U.S. dollar-denominated, investment-grade
        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          Expenses1      Expenses1,2       Expenses      Fee Waiver1,2    Fee Waiver

          0.10%              None             0.00%           0.00%            0.10%         (0.00)%         0.10%

          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
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        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

                                   $10                               $19

        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, investment-grade
        held in a taxable account. These costs,            (as determined by Bloomberg Index
        which are not reflected in the Annual              Services Limited (the “Index Provider”
        Fund Operating Expenses or in the                  or “Bloomberg”)) corporate bonds
        Example, affect the Fund’s                         scheduled to mature after December
        performance. During the most recent                31, 2021 and before December 16,
        fiscal year, the Fund’s portfolio turnover         2022. As of October 31, 2020, a
        rate was 16% of the average value of its           significant portion of the Underlying
        portfolio.                                         Index is represented by securities of
                                                           companies in the consumer staples and
        Principal Investment                               financials industries or sectors. The
        Strategies                                         components of the Underlying Index are
        The Fund seeks to meet its investment              likely to change over time.
        objective generally by investing in                The Underlying Index includes U.S.
        component securities of the Bloomberg              dollar-denominated, investment-grade
        Barclays December 2022 Maturity                    securities publicly issued by U.S. and
        Corporate Index (the “Underlying                   non-U.S. corporate issuers that have
        Index”). The Fund may also invest in               $300 million or more of outstanding
        other exchange-traded funds (“ETFs”),              face value at the time of inclusion. The
        U.S. government securities, short-term             non-U.S. corporate issuers included in
        paper, cash and cash equivalents,                  the Underlying Index consist primarily of
        including shares of money market funds             corporate bonds issued by companies
        advised by BFA or its affiliates.                  domiciled in developed countries. The
        The Fund is a term fund that will                  Fund will invest in non-U.S. issuers to
        terminate on or about December 15,                 the extent necessary for it to track the
        2022, at which time it will distribute its         Underlying Index. Each bond must be

                                                     S-2
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        registered with the SEC, have been                the Underlying Index. The securities in
        exempt from registration at issuance, or          the Underlying Index are updated on the
        have been offered pursuant to Rule                last calendar day of each month until six
        144A under the Securities Act of 1933,            months prior to maturity. The last
        as amended (the “1933 Act”), with                 rebalance date will be on June 30, 2022.
        registration rights. Further, the                 During this final six month period, the
        securities in the Underlying Index must           Underlying Index will no longer be
        be denominated in U.S. dollars and have           updated or rebalanced, except to
        a fixed-rate, although they can carry a           remove securities which are
        coupon that steps-up or changes                   downgraded to below investment-grade
        according to a predetermined schedule.            per the eligibility criteria described
        In addition, to be included in the                above. Additionally, during this period,
        Underlying Index, securities that are             existing bond weights will be allowed to
        rated by all three of the rating agencies         float based on changes in market value.
        named below must be rated                         When a bond that is included in the
        “investment-grade” by at least two of             Underlying Index matures, its maturity
        the agencies, which is defined as Baa3            value will be represented in the
        or higher by Moody’s Investors Service,           Underlying Index by cash throughout
        Inc. or BBB- or higher by S&P Global              the remaining life of the Underlying
        Ratings or Fitch Ratings, Inc. When               Index. As the Fund approaches its
        ratings from only two of the three rating         termination date, its holdings of money
        agencies are available, the lower rating          market or similar funds may increase,
        is used to determine eligibility.                 causing the Fund to incur the fees and
        Securities with a rating from only one of         expenses of these funds. By December
        the three ratings agencies must be                15, 2022, the Underlying Index value
        rated investment-grade in order to be             will be represented almost entirely by
        included in the Underlying Index.                 cash as no securities will remain in the
        The Underlying Index is constructed               Underlying Index.
        with the following methodology. A                 The Fund is a series of the iShares
        parent index, the Bloomberg Barclays              iBonds® fixed maturity series of bond
        U.S. Corporate Index, representing U.S.           ETFs sponsored by BlackRock, Inc.
        dollar-denominated, taxable,                      (“BlackRock”). The iBonds® fixed
        investment-grade corporate bonds, is              maturity series do not invest in U.S.
        stripped of securities maturing outside           savings bonds or other U.S. government
        of the maturity range defined above.              bonds (except to the extent the funds
        During the final two years of the                 hold cash equivalent instruments
        Underlying Index, bonds that had been             consistent with their investment
        screened out of the parent index due to           objectives) and are not designed to
        being within one year of maturity will be         provide protection against inflation.
        added back into the Underlying Index
        until such bonds reach maturity.                  BFA uses a “passive” or indexing
        Securities are then market-cap                    approach to try to achieve the Fund’s
        weighted within the Underlying Index,             investment objective. Unlike many
        with a 3% cap on any one issuer, and a            investment companies, the Fund does
        pro rata distribution of any excess               not try to “beat” the index it tracks and
        weight across the remaining issuers in            does not seek temporary defensive

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        positions when markets decline or                 From time to time when conditions
        appear overvalued.                                warrant, however, the Fund may invest
        Indexing may eliminate the chance that            at least 80% of its assets in the
        the Fund will substantially outperform            component securities of the Underlying
        the Underlying Index but also may                 Index and may invest up to 20% of its
        reduce some of the risks of active                assets in certain futures, options and
        management, such as poor security                 swap contracts, cash and cash
        selection. Indexing seeks to achieve              equivalents, including shares of
        lower costs and better after-tax                  BlackRock Cash Funds, as well as in
        performance by aiming to keep portfolio           securities not included in the Underlying
        turnover low in comparison to actively            Index, but which BFA believes will help
        managed investment companies.                     the Fund track the Underlying Index.
                                                          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 months of operation, as the bonds
        indexing strategy that involves investing
                                                          held by the Fund mature, the proceeds
        in a representative sample of securities
                                                          will not be reinvested by the Fund in
        that collectively has an investment
                                                          bonds but instead will be held in cash
        profile similar to that of an applicable
                                                          and cash equivalents. By December 15,
        underlying index. The securities
                                                          2022, the Underlying Index is expected
        selected are expected to have, in the
                                                          to consist almost entirely of cash
        aggregate, investment characteristics
                                                          earned in this manner. On or around this
        (based on factors such as market value
                                                          date, the Fund will wind up and
        and industry weightings), fundamental
                                                          terminate, and its net assets will be
        characteristics (such as return
                                                          distributed to then-current shareholders
        variability, duration, maturity, credit
                                                          pursuant to a plan of liquidation.
        ratings and yield) and liquidity measures
        similar to those of an applicable                 The Fund may lend securities
        underlying index. The Fund may or may             representing up to one-third of the value
        not hold all of the securities in the             of the Fund’s total assets (including the
        Underlying Index.                                 value of any collateral received).
        The Fund generally will invest at least           The Underlying Index is sponsored by
        90% of its assets in the component                Bloomberg, which is independent of the
        securities of the Underlying Index,               Fund and BFA. The Index Provider
        except during the last months of the              determines the composition and relative
        Fund’s operations, as described below,            weightings of the securities in the
        and may invest up to 10% of its assets            Underlying Index and publishes
        in certain futures, options and swap              information regarding the market value
        contracts, cash and cash equivalents,             of the Underlying Index.
        including shares of money market funds            Industry Concentration Policy. The
        advised by BFA or its affiliates                  Fund will concentrate its investments
        (“BlackRock Cash Funds”), as well as in           (i.e., hold 25% or more of its total
        securities not included in the Underlying         assets) in a particular industry or group
        Index, but which BFA believes will help           of industries to approximately the same
        the Fund track the Underlying Index.              extent that the Underlying Index is

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        concentrated. For purposes of this                 creation or redemption orders with
        limitation, securities of the U.S.                 respect to the Fund and no other
        government (including its agencies and             Authorized Participant is able to step
        instrumentalities), repurchase                     forward to create or redeem, Fund
        agreements collateralized by U.S.                  shares may be more likely to trade at a
        government securities, and securities of           premium or discount to NAV and
        state or municipal governments and                 possibly face trading halts or delisting.
        their political subdivisions are not               Call Risk. During periods of falling
        considered to be issued by members of              interest rates, an issuer of a callable
        any industry.                                      bond held by the Fund may “call” or
        Summary of Principal Risks                         repay the security before its stated
                                                           maturity, and the Fund may have to
        As with any investment, you could lose             reinvest the proceeds in securities with
        all or part of your investment in the              lower yields, which would result in a
        Fund, and the Fund’s performance could             decline in the Fund’s income, or in
        trail that of other investments. The Fund          securities with greater risks or with
        is subject to certain risks, including the         other less favorable features.
        principal risks noted below, any of
        which may adversely affect the Fund’s              Concentration Risk. The Fund may be
        net asset value per share (“NAV”),                 susceptible to an increased risk of loss,
        trading price, yield, total return and             including losses due to adverse events
        ability to meet its investment objective.          that affect the Fund’s investments more
        The order of the below risk factors does           than the market as a whole, to the
        not indicate the significance of any               extent that the Fund’s investments are
        particular risk factor.                            concentrated in the securities and/or
                                                           other assets of a particular issuer or
        Asset Class Risk. Securities and other             issuers, country, group of countries,
        assets in the Underlying Index or in the           region, market, industry, group of
        Fund’s portfolio may underperform in               industries, sector, market segment or
        comparison to the general financial                asset class.
        markets, a particular financial market or
        other asset classes.                               Consumer Staples Sector Risk. The
                                                           consumer staples sector may be
        Authorized Participant Concentration               affected by, among other things,
        Risk. Only an Authorized Participant (as           marketing campaigns, changes in
        defined in the Creations and                       consumer demands, government
        Redemptions section of this Prospectus)            regulations and changes in commodity
        may engage in creation or redemption               prices.
        transactions directly with the Fund, and
        none of those Authorized Participants is           Credit Risk. Debt issuers and other
        obligated to engage in creation and/or             counterparties may be unable or
        redemption transactions. The Fund has              unwilling to make timely interest and/or
        a limited number of institutions that              principal payments when due or
        may act as Authorized Participants on              otherwise honor their obligations.
        an agency basis (i.e., on behalf of other          Changes in an issuer’s credit rating or
        market participants). To the extent that           the market’s perception of an issuer’s
        Authorized Participants exit the                   creditworthiness may also adversely
        business or are unable to proceed with             affect the value of the Fund’s

                                                     S-5
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        investment in that issuer. The degree of           activities or banking is limited by
        credit risk depends on an issuer’s or              applicable law. The impact of changes in
        counterparty’s financial condition and             capital requirements and recent or
        on the terms of an obligation.                     future regulation of any individual
        Cybersecurity Risk. Failures or                    financial company, or of the financials
        breaches of the electronic systems of              sector as a whole, cannot be predicted.
        the Fund, the Fund’s adviser, distributor,         In recent years, cyberattacks and
        the Index Provider and other service               technology malfunctions and failures
        providers, market makers, Authorized               have become increasingly frequent in
        Participants or the issuers of securities          this sector and have caused significant
        in which the Fund invests have the                 losses to companies in this sector,
        ability to cause disruptions, negatively           which may negatively impact the Fund.
        impact the Fund’s business operations              Fluctuation of Yield and Liquidation
        and/or potentially result in financial             Amount Risk. The Fund, unlike a direct
        losses to the Fund and its shareholders.           investment in a bond that has a level
        While the Fund has established business            coupon payment and a fixed payment at
        continuity plans and risk management               maturity, will make distributions of
        systems seeking to address system                  income that vary over time. It is
        breaches or failures, there are inherent           expected that an investment in the
        limitations in such plans and systems.             Fund, if held through maturity, will
        Furthermore, the Fund cannot control               produce aggregate returns comparable
        the cybersecurity plans and systems of             to a direct investment in a group of
        the Fund’s Index Provider and other                bonds of similar credit quality and
        service providers, market makers,                  maturity. Unlike a direct investment in
        Authorized Participants or issuers of              bonds, the breakdown of returns
        securities in which the Fund invests.              between Fund distributions and
        Declining Yield Risk. During the twelve            liquidation proceeds are not predictable
        months prior to the Fund’s planned                 at the time of your investment. For
        termination date, the Fund’s yield will            example, at times during the Fund’s
        generally tend to move toward                      existence it may make distributions at a
        prevailing money market rates and may              greater (or lesser) rate than the coupon
        be lower than the yields of the bonds              payments received on the Fund’s
        previously held by the Fund and lower              portfolio, which would result in the Fund
        than prevailing yields for bonds in the            returning a lesser (or greater) amount
        market.                                            on liquidation than would otherwise be
                                                           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

                                                     S-6
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        Illiquid Investments Risk. The Fund                  investment objective. Market
        may invest up to an aggregate amount                 disruptions and regulatory restrictions
        of 15% of its net assets in illiquid                 could have an adverse effect on the
        investments. An illiquid investment is               Fund’s ability to adjust its exposure to
        any investment that the Fund                         the required levels in order to track the
        reasonably expects cannot be sold or                 Underlying Index. Errors in index data,
        disposed of in current market                        index computations or the construction
        conditions in seven calendar days or                 of the Underlying Index in accordance
        less without significantly changing the              with its methodology may occur from
        market value of the investment. To the               time to time and may not be identified
        extent the Fund holds illiquid                       and corrected by the Index Provider for
        investments, the illiquid investments                a period of time or at all, which may
        may reduce the returns of the Fund                   have an adverse impact on the Fund and
        because the Fund may be unable to                    its shareholders. Unusual market
        transact at advantageous times or                    conditions may cause the Index
        prices. During periods of market                     Provider to postpone a scheduled
        volatility, liquidity in the market for the          rebalance, which could cause the
        Fund’s shares may be impacted by the                 Underlying Index to vary from its normal
        liquidity in the market for the underlying           or expected composition.
        securities or instruments held by the                Infectious Illness Risk. An outbreak of
        Fund, which could lead to the Fund’s                 an infectious respiratory illness, COVID-
        shares trading at a premium or discount              19, caused by a novel coronavirus has
        to the Fund’s NAV.                                   resulted in travel restrictions, disruption
        Income Risk. The Fund’s income may                   of healthcare systems, prolonged
        decline if interest rates fall. This decline         quarantines, cancellations, supply chain
        in income can occur because the Fund                 disruptions, lower consumer demand,
        may subsequently invest in lower-                    layoffs, ratings downgrades, defaults
        yielding bonds as bonds in its portfolio             and other significant economic impacts.
        mature, are near maturity or are called,             Certain markets have experienced
        bonds in the Underlying Index are                    temporary closures, extreme volatility,
        substituted, or the Fund otherwise                   severe losses, reduced liquidity and
        needs to purchase additional bonds. As               increased trading costs. These events
        the Fund does not seek to return any                 will have an impact on the Fund and its
        predetermined amount at maturity or in               investments and could impact the
        periodic distributions, the amount of                Fund’s ability to purchase or sell
        income generated by the Fund may vary                securities or cause elevated tracking
        during its term. In addition, the Fund’s             error and increased premiums or
        income is expected to decline in the                 discounts to the Fund’s NAV. Other
        months leading up to its maturity date               infectious illness outbreaks in the future
        because its portfolio will increasingly              may result in similar impacts.
        consist of cash and cash equivalents.                Interest Rate Risk. During periods of
        Index-Related Risk. There is no                      very low or negative interest rates, the
        guarantee that the Fund’s investment                 Fund may be unable to maintain positive
        results will have a high degree of                   returns or pay dividends to Fund
        correlation to those of the Underlying               shareholders. Very low or negative
        Index or that the Fund will achieve its              interest rates may magnify interest rate

                                                       S-7
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        risk. Changing interest rates, including            market downturns. Local, regional or
        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               Operational Risk. The Fund is exposed
        historically low interest rate                      to operational risks arising from a
        environment heightens the risks                     number of factors, including, but not
        associated with rising interest rates.              limited to, human error, processing and
                                                            communication errors, errors of the
        Issuer Risk. The performance of the                 Fund’s service providers, counterparties
        Fund depends on the performance of                  or other third-parties, failed or
        individual securities to which the Fund             inadequate processes and technology
        has exposure.The Fund may be                        or systems failures. The Fund and BFA
        adversely affected if an issuer of                  seek to reduce these operational risks
        underlying securities held by the Fund is           through controls and procedures.
        unable or unwilling to repay principal or           However, these measures do not
        interest when due. Changes in the                   address every possible risk and may be
        financial condition or credit rating of an          inadequate to address significant
        issuer of those securities may cause the            operational risks.
        value of the securities to decline.
                                                            Passive Investment Risk. The Fund is
        Management Risk. As the Fund will not               not actively managed, and BFA generally
        fully replicate the Underlying Index, it is         does not attempt to take defensive
        subject to the risk that BFA’s                      positions under any market conditions,
        investment strategy may not produce                 including declining markets.
        the intended results.
                                                            Reinvestment Risk. The Fund may
        Market Risk. The Fund could lose                    invest a portion of its assets in short-
        money over short periods due to short-              term fixed-income instruments and, as a
        term market movements and over                      result, may be adversely affected if
        longer periods during more prolonged                interest rates fall because it may have

                                                      S-8
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        to invest in lower-yielding                       other instruments held in the Fund’s
        instruments as bonds in the Fund’s                portfolio and those included in the
        portfolio mature.                                 Underlying Index, pricing
        Reliance on Trading Partners Risk.                differences (including, as applicable,
        The Fund invests in countries or regions          differences between a security’s price
        whose economies are heavily                       at the local market close and the Fund’s
        dependent upon trading with key                   valuation of a security at the time of
        partners. Any reduction in this trading           calculation of the Fund’s NAV),
        may have an adverse impact on the                 transaction costs incurred by the Fund,
        Fund’s investments.                               the Fund’s holding of uninvested cash,
                                                          differences in timing of the accrual of or
        Risk of Investing in the U.S. Certain             the valuation of distributions, the
        changes in the U.S. economy, such as              requirements to maintain pass-through
        when the U.S. economy weakens or                  tax treatment, portfolio transactions
        when its financial markets decline, may           carried out to minimize the distribution
        have an adverse effect on the securities          of capital gains to shareholders,
        to which the Fund has exposure.                   acceptance of custom baskets, changes
        Securities Lending Risk. The Fund may             to the Underlying Index or the costs to
        engage in securities lending. Securities          the Fund of complying with various new
        lending involves the risk that the Fund           or existing regulatory requirements. This
        may lose money because the borrower               risk may be heightened during times of
        of the loaned securities fails to return          increased market volatility or other
        the securities in a timely manner or at           unusual market conditions. Tracking
        all. The Fund could also lose money in            error also may result because the Fund
        the event of a decline in the value of            incurs fees and expenses, while the
        collateral provided for loaned securities         Underlying Index does not.
        or a decline in the value of any                  Valuation Risk. Because the bond
        investments made with cash collateral.            market may be open on days or during
        These events could also trigger adverse           time periods when the Fund does not
        tax consequences for the Fund.                    price its shares, the value of the
        Tracking Error Risk. The Fund may be              securities or other assets in the Fund’s
        subject to tracking error, which is the           portfolio may change on days or during
        divergence of the Fund’s performance              time periods when shareholders will not
        from that of the Underlying Index.                be able to purchase or sell the Fund’s
        Tracking error may occur because of               shares.
        differences between the securities and

                                                    S-9
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        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 (Years Ended December 31)

                        10%

                         8%                                            7.37%

                         6%        5.46%
                                               3.92%
                         4%                                                         3.45%

                         2%
                                                           0.08%
                         0%

                                   2016        2017        2018        2019        2020
        The best calendar quarter return during the periods shown above was 4.24% in the 2nd
        quarter of 2020; the worst was -2.40% in the 4th quarter of 2016.
        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).
                                       Average Annual Total Returns
                                (for the periods ended December 31, 2020)
                                                                                                  Since Fund
                                                                      One Year     Five Years      Inception
        (Inception Date: 3/10/2015)
           Return Before Taxes                                          3.45%         4.03%          3.33%
           Return After Taxes on Distributions1                         2.47%         2.85%          2.14%
           Return After Taxes on Distributions and Sale of Fund
           Shares1                                                      2.03%         2.57%          2.02%
        Bloomberg Barclays December 2022 Maturity
        Corporate Index (Index returns do not reflect
        deductions for fees, expenses, or taxes)                        3.50%         4.17%          3.43%

             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-10
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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 IRA, in which case, your distributions
        Fund. Each Portfolio Manager                         generally will be taxed when withdrawn.
        supervises a portfolio management                    Payments to Broker-Dealers
        team. Mr. Mauro and Ms. Uyehara have
        been Portfolio Managers of the Fund
                                                             and Other Financial
        since 2015 and 2021, respectively.                   Intermediaries
                                                             If you purchase shares of the Fund
        Purchase and Sale of Fund                            through a broker-dealer or other
        Shares                                               financial intermediary (such as a bank),
        The Fund is an ETF. Individual shares of             BFA or other related companies may
        the Fund may only be bought and sold in              pay the intermediary for marketing
        the secondary market through a broker-               activities and presentations, educational
        dealer. Because ETF shares trade at                  training programs, conferences, the
        market prices rather than at NAV,                    development of technology platforms
        shares may trade at a price greater than             and reporting systems or other services
        NAV (a premium) or less than NAV (a                  related to the sale or promotion of the
        discount). An investor may incur costs               Fund. These payments may create a
        attributable to the difference between               conflict of interest by influencing the
        the highest price a buyer is willing to              broker-dealer or other intermediary and
        pay to purchase shares of the Fund (bid)             your salesperson to recommend the
        and the lowest price a seller is willing to          Fund over another investment. Ask your
        accept for shares of the Fund (ask)                  salesperson or visit your financial
        when buying or selling shares in the                 intermediary’s website for more
        secondary market (the “bid-ask                       information.
        spread”).

                                                      S-11
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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
        NYSE Arca, Inc. (“NYSE Arca”). 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 Amended and Restated 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.
        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.
        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

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