2021 Prospectus - iShares

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                                                                             JUNE 29, 2021

              2021 Prospectus

         iShares Trust
         • iShares Core 10+ Year USD Bond ETF | ILTB | NYSE ARCA

         The Securities and Exchange Commission (“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.
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 . . . . . .                                              16
                        Portfolio Holdings Information . . . . . . . . . . . . .                                     24
                        Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               24
                        Shareholder Information . . . . . . . . . . . . . . . . . . . .                              27
                        Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         35
                        Financial Highlights . . . . . . . . . . . . . . . . . . . . . . . . . .                     36
                        Index Provider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             37
                        Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          37

        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 U.S. Long Government/Credit Bond Index” and “Bloomberg Barclays U.S. Universal 10+
        Year Index” are trademarks of Bloomberg and its licensors and have been licensed for use for certain purposes
        by BlackRock Fund Advisors or its affiliates. iShares® and BlackRock® are registered trademarks of BlackRock
        Fund Advisors and its affiliates.

                                                                i
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Table of Contents

              iSHARES® CORE 10+ YEAR USD BOND ETF
                         Ticker: ILTB                  Stock Exchange: NYSE Arca

        Investment Objective
        The iShares Core 10+ Year USD Bond ETF (the “Fund”) seeks to track the investment
        results of an index composed of U.S. dollar-denominated bonds that are rated either
        investment grade or high-yield with remaining maturities greater than ten years.

        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.
        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
                                    Distribution and                                   Fund
          Management                Service (12b-1)              Other              Operating
             Fees                         Fees                 Expenses1            Expenses
                0.06%                        None                0.00%                0.06%

          1
              The amount rounded to 0.00%.
        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. 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                      3 Years                    5 Years                  10 Years

          $6                            $19                      $34                      $77

                                                       S-1
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        Portfolio Turnover. The Fund may pay               Bloomberg Barclays U.S. Universal
        transaction costs, such as commissions,            Index.
        when it buys and sells securities (or              As of February 28, 2021, a significant
        “turns over” its portfolio). A higher              portion of the Underlying Index is
        portfolio turnover rate may indicate               represented by U.S. Treasury securities.
        higher transaction costs and may result            The components of the Underlying Index
        in higher taxes when Fund shares are               are likely to change over time. The
        held in a taxable account. These costs,            securities in the Underlying Index must
        which are not reflected in the Annual              have at least 10 years remaining to
        Fund Operating Expenses or in the                  maturity, or at least 10 years remaining
        Example, affect the Fund’s                         to the first call date in the case of
        performance. During the most recent                callable perpetual securities. In
        fiscal year, the Fund’s portfolio turnover         addition, the securities in the Underlying
        rate was 17% of the average value of its           Index must be denominated in U.S.
        portfolio.                                         dollars and be non-convertible.
                                                           Excluded from the Underlying Index are
        Principal Investment
                                                           tax-exempt municipal securities, coupon
        Strategies                                         issues that have been stripped from
        The Fund seeks to track the investment             bonds, structured notes and private
        results of the Bloomberg Barclays U.S.             placements (excluding Rule 144A
        Universal 10+ Year Index (the                      Bonds). The Underlying Index is market
        “Underlying Index”), which measures                capitalization-weighted and is
        the performance of U.S. dollar-                    rebalanced on the last day of the
        denominated taxable bonds that are                 month.
        rated either investment-grade or high              BFA uses a “passive” or indexing
        yield (as determined by Bloomberg                  approach to try to achieve the Fund’s
        Index Services Limited (the “Index                 investment objective. Unlike many
        Provider” or “Bloomberg”)) with                    investment companies, the Fund does
        remaining maturities greater than ten              not try to “beat” the index it tracks and
        years. The Underlying Index includes               does not seek temporary defensive
        U.S. Treasury bonds, government-                   positions when markets decline or
        related bonds (i.e., U.S. and non-U.S.             appear overvalued.
        agencies, sovereign, quasi-sovereign,
        supranational and local authority debt),           Indexing may eliminate the chance that
        investment-grade and high yield U.S.               the Fund will substantially outperform
        corporate bonds, Eurodollar bonds (i.e.,           the Underlying Index but also may
        U.S. dollar-denominated bonds issued               reduce some of the risks of active
        by foreign issuers outside the U.S.),              management, such as poor security
        bonds registered with the SEC or                   selection. Indexing seeks to achieve
        exempt from registration at the time of            lower costs and better after-tax
        issuance, or offered pursuant to Rule              performance by aiming to keep portfolio
        144A under the Securities Act of 1933,             turnover low in comparison to actively
        as amended (the “1933 Act”) with or                managed investment companies.
        without registration rights (“Rule 144A            BFA uses a representative sampling
        Bonds”) and emerging market bonds.                 indexing strategy to manage the Fund.
        The Underlying Index is a subset of the            “Representative sampling” is an

                                                     S-2
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        indexing strategy that involves investing         of the Fund’s total assets (including the
        in a representative sample of securities          value of any collateral received).
        that collectively has an investment               The Underlying Index is sponsored by
        profile similar to that of an applicable          Bloomberg, which is independent of the
        underlying index. The securities                  Fund and BFA. The Index Provider
        selected are expected to have, in the             determines the composition and relative
        aggregate, investment characteristics             weightings of the securities in the
        (based on factors such as market value            Underlying Index and publishes
        and industry weightings), fundamental             information regarding the market value
        characteristics (such as return                   of the Underlying Index.
        variability, duration, maturity, credit
        ratings and yield) and liquidity measures         Industry Concentration Policy. The
        similar to those of an applicable                 Fund will concentrate its investments
        underlying index. The Fund may or may             (i.e., hold 25% or more of its total
        not hold all of the securities in the             assets) in a particular industry or group
        Underlying Index.                                 of industries to approximately the same
                                                          extent that the Underlying Index is
        The Fund generally will invest at least           concentrated. For purposes of this
        90% of its assets in the component                limitation, securities of the U.S.
        securities of the Underlying Index and            government (including its agencies and
        may invest up to 10% of its assets in             instrumentalities), repurchase
        certain futures, options and swap                 agreements collateralized by U.S.
        contracts, cash and cash equivalents,             government securities, and securities of
        including shares of money market funds            state or municipal governments and
        advised by BFA or its affiliates                  their political subdivisions are not
        (“BlackRock Cash Funds”), as well as in           considered to be issued by members of
        securities not included in the Underlying         any industry.
        Index, but which BFA believes will help
        the Fund track the Underlying Index.              Summary of Principal Risks
        From time to time when conditions
                                                          As with any investment, you could lose
        warrant, however, the Fund may invest
                                                          all or part of your investment in the
        at least 80% of its assets in the
                                                          Fund, and the Fund’s performance could
        component securities of the Underlying
                                                          trail that of other investments. The Fund
        Index and may invest up to 20% of its
                                                          is subject to certain risks, including the
        assets in certain futures, options and
                                                          principal risks noted below, any of
        swap contracts, cash and cash
                                                          which may adversely affect the Fund’s
        equivalents, including shares of
                                                          net asset value per share (“NAV”),
        BlackRock Cash Funds, as well as in
                                                          trading price, yield, total return and
        securities not included in the Underlying
                                                          ability to meet its investment objective.
        Index, but which BFA believes will help
                                                          The order of the below risk factors does
        the Fund track the Underlying Index. The
                                                          not indicate the significance of any
        Fund seeks to track the investment
                                                          particular risk factor.
        results of the Underlying Index before
        fees and expenses of the Fund.                    Asset Class Risk. Securities and other
                                                          assets in the Underlying Index or in the
        The Fund may lend securities
                                                          Fund’s portfolio may underperform in
        representing up to one-third of the value
                                                          comparison to the general financial

                                                    S-3
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        markets, a particular financial market or         industries, sector, market segment or
        other asset classes.                              asset class.
        Authorized Participant Concentration              Credit Risk. Debt issuers and other
        Risk. Only an Authorized Participant (as          counterparties may be unable or
        defined in the Creations and                      unwilling to make timely interest and/or
        Redemptions section of this prospectus            principal payments when due or
        (the “Prospectus”)) may engage in                 otherwise honor their obligations.
        creation or redemption transactions               Changes in an issuer’s credit rating or
        directly with the Fund, and none of               the market’s perception of an issuer’s
        those Authorized Participants is                  creditworthiness may also adversely
        obligated to engage in creation and/or            affect the value of the Fund’s
        redemption transactions. The Fund has             investment in that issuer. The degree of
        a limited number of institutions that             credit risk depends on an issuer’s or
        may act as Authorized Participants on             counterparty’s financial condition and
        an agency basis (i.e., on behalf of other         on the terms of an obligation.
        market participants). To the extent that          Cybersecurity Risk. Failures or
        Authorized Participants exit the                  breaches of the electronic systems of
        business or are unable to proceed with            the Fund, the Fund’s adviser, distributor,
        creation or redemption orders with                the Index Provider and other service
        respect to the Fund and no other                  providers, market makers, Authorized
        Authorized Participant is able to step            Participants or the issuers of securities
        forward to create or redeem, Fund                 in which the Fund invests have the
        shares may be more likely to trade at a           ability to cause disruptions, negatively
        premium or discount to NAV and                    impact the Fund’s business operations
        possibly face trading halts or delisting.         and/or potentially result in financial
        Call Risk. During periods of falling              losses to the Fund and its shareholders.
        interest rates, an issuer of a callable           While the Fund has established business
        bond held by the Fund may “call” or               continuity plans and risk management
        repay the security before its stated              systems seeking to address system
        maturity, and the Fund may have to                breaches or failures, there are inherent
        reinvest the proceeds in securities with          limitations in such plans and systems.
        lower yields, which would result in a             Furthermore, the Fund cannot control
        decline in the Fund’s income, or in               the cybersecurity plans and systems of
        securities with greater risks or with             the Fund’s Index Provider and other
        other less favorable features.                    service providers, market makers,
        Concentration Risk. The Fund may be               Authorized Participants or issuers of
        susceptible to an increased risk of loss,         securities in which the Fund invests.
        including losses due to adverse events            Geographic Risk. A natural disaster
        that affect the Fund’s investments more           could occur in a geographic region in
        than the market as a whole, to the                which the Fund invests, which could
        extent that the Fund’s investments are            adversely affect the economy or the
        concentrated in the securities and/or             business operations of companies in the
        other assets of a particular issuer or            specific geographic region, causing an
        issuers, country, group of countries,             adverse impact on the Fund’s
        region, market, industry, group of

                                                    S-4
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        investments in, or which are exposed to,             Provider to postpone a scheduled
        the affected region.                                 rebalance, which could cause the
        High Yield Securities Risk. Securities               Underlying Index to vary from its normal
        that are rated below investment-grade                or expected composition.
        (commonly referred to as “junk bonds,”               Infectious Illness Risk. An outbreak of
        which may include those bonds rated                  an infectious respiratory illness, COVID-
        below “BBB-” by Standard & Poor’s®                   19, caused by a novel coronavirus has
        Global Ratings, a subsidiary of S&P                  resulted in travel restrictions, disruption
        Global (“S&P Global Ratings”) and Fitch              of healthcare systems, prolonged
        Ratings, Inc. (“Fitch”) or below “Baa3”              quarantines, cancellations, supply chain
        by Moody’s Investors Service, Inc.                   disruptions, lower consumer demand,
        (“Moody’s”)), or are unrated, may be                 layoffs, ratings downgrades, defaults
        deemed speculative, may involve                      and other significant economic impacts.
        greater levels of risk than higher-rated             Certain markets have experienced
        securities of similar maturity and may               temporary closures, extreme volatility,
        be more likely to default.                           severe losses, reduced liquidity and
        Income Risk. The Fund’s income may                   increased trading costs. These events
        decline if interest rates fall. This decline         will have an impact on the Fund and its
        in income can occur because the Fund                 investments and could impact the
        may subsequently invest in lower-                    Fund’s ability to purchase or sell
        yielding bonds as bonds in its portfolio             securities or cause elevated tracking
        mature, are near maturity or are called,             error and increased premiums or
        bonds in the Underlying Index are                    discounts to the Fund’s NAV. Other
        substituted, or the Fund otherwise                   infectious illness outbreaks in the future
        needs to purchase additional bonds.                  may result in similar impacts.

        Index-Related Risk. There is no                      Interest Rate Risk. During periods of
        guarantee that the Fund’s investment                 very low or negative interest rates, the
        results will have a high degree of                   Fund may be unable to maintain positive
        correlation to those of the Underlying               returns or pay dividends to Fund
        Index or that the Fund will achieve its              shareholders. Very low or negative
        investment objective. Market                         interest rates may magnify interest rate
        disruptions and regulatory restrictions              risk. Changing interest rates, including
        could have an adverse effect on the                  rates that fall below zero, may have
        Fund’s ability to adjust its exposure to             unpredictable effects on markets, result
        the required levels in order to track the            in heightened market volatility and
        Underlying Index. Errors in index data,              detract from the Fund’s performance to
        index computations or the construction               the extent the Fund is exposed to such
        of the Underlying Index in accordance                interest rates. Additionally, under
        with its methodology may occur from                  certain market conditions in which
        time to time and may not be identified               interest rates are low and the market
        and corrected by the Index Provider for              prices for portfolio securities have
        a period of time or at all, which may                increased, the Fund may have a very low
        have an adverse impact on the Fund and               or even negative yield. A low or negative
        its shareholders. Unusual market                     yield would cause the Fund to lose
        conditions may cause the Index                       money in certain conditions and over
                                                             certain time periods. An increase in

                                                       S-5
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        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,                   Operational Risk. The Fund is exposed
        including those held by the Fund. The               to operational risks arising from a
        historically low interest rate                      number of factors, including, but not
        environment heightens the risks                     limited to, human error, processing and
        associated with rising interest rates.              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.                               Risk of Investing in Russia. Investing
        Market Risk. The Fund could lose                    in Russian securities involves significant
        money over short periods due to short-              risks, including legal, regulatory,
        term market movements and over                      currency and economic risks that are
        longer periods during more prolonged                specific to Russia. In addition, investing
        market downturns. Local, regional or                in Russian securities involves risks
        global events such as war, acts of                  associated with the settlement of
        terrorism, the spread of infectious                 portfolio transactions and loss of the
        illness or other public health issues,              Fund’s ownership rights in its portfolio
        recessions, or other events could have a            securities as a result of the system of
        significant impact on the Fund and its              share registration and custody in
        investments and could result in                     Russia. A number of jurisdictions,
        increased premiums or discounts to the              including the U.S., Canada and the
        Fund’s NAV.                                         European Union (the “EU”), have
        Market Trading Risk. The Fund faces                 imposed economic sanctions on certain
        numerous market trading risks,                      Russian individuals and Russian
        including the potential lack of an active           corporate entities. Additionally, Russia
        market for Fund shares, losses from                 is alleged to have participated in state-
        trading in secondary markets, periods of            sponsored cyberattacks against foreign
        high volatility and disruptions in the              companies and foreign governments.

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        Actual and threatened responses to                 when its financial markets decline, may
        such activity, including purchasing                have an adverse effect on the securities
        restrictions, sanctions, tariffs or                to which the Fund has exposure.
        cyberattacks on the Russian                        Securities Lending Risk. The Fund may
        government or Russian companies, may               engage in securities lending. Securities
        impact Russia’s economy and Russian                lending involves the risk that the Fund
        issuers of securities in which the Fund            may lose money because the borrower
        invests.                                           of the loaned securities fails to return
        Risk of Investing in Saudi Arabia. The             the securities in a timely manner or at
        ability of foreign investors (such as the          all. The Fund could also lose money in
        Fund) to invest in the securities of Saudi         the event of a decline in the value of
        Arabian issuers is relatively new. Such            collateral provided for loaned securities
        ability could be restricted by the Saudi           or a decline in the value of any
        Arabian government at any time, and                investments made with cash collateral.
        unforeseen risks could materialize with            These events could also trigger adverse
        respect to foreign ownership in such               tax consequences for the Fund.
        securities. The economy of Saudi Arabia            Security Risk. Some countries and
        is dominated by petroleum exports. A               regions in which the Fund invests have
        sustained decrease in petroleum prices             experienced security concerns, such as
        could have a negative impact on all                terrorism and strained international
        aspects of the economy. Investments in             relations. Incidents involving a country’s
        the securities of Saudi Arabian issuers            or region’s security may cause
        involve risks not typically associated             uncertainty in its markets and may
        with investments in securities of issuers          adversely affect its economy and the
        in more developed countries that may               Fund’s investments.
        negatively affect the value of the Fund’s
        investments. Such heightened risks may             Tracking Error Risk. The Fund may be
        include, among others, expropriation               subject to tracking error, which is the
        and/or nationalization of assets,                  divergence of the Fund’s performance
        restrictions on and government                     from that of the Underlying Index.
        intervention in international trade,               Tracking error may occur because of
        confiscatory taxation, political                   differences between the securities and
        instability, including authoritarian and/          other instruments held in the Fund’s
        or military involvement in governmental            portfolio and those included in the
        decision making, armed conflict, crime             Underlying Index, pricing
        and instability as a result of religious,          differences (including, as applicable,
        ethnic and/or socioeconomic unrest.                differences between a security’s price
        There remains the possibility that                 at the local market close and the Fund’s
        instability in the larger Middle East              valuation of a security at the time of
        region could adversely impact the                  calculation of the Fund’s NAV),
        economy of Saudi Arabia, and there is              transaction costs incurred by the Fund,
        no assurance of political stability in             the Fund’s holding of uninvested cash,
        Saudi Arabia.                                      differences in timing of the accrual of or
                                                           the valuation of distributions, the
        Risk of Investing in the U.S. Certain              requirements to maintain pass-through
        changes in the U.S. economy, such as               tax treatment, portfolio transactions
        when the U.S. economy weakens or

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        carried out to minimize the distribution           government or one of its agencies or
        of capital gains to shareholders,                  sponsored entities, some of which may
        acceptance of custom baskets, changes              not be backed by the full faith and credit
        to the Underlying Index or the costs to            of the U.S. government. MBS represent
        the Fund of complying with various new             interests in “pools” of mortgages and
        or existing regulatory requirements. This          are subject to interest rate,
        risk may be heightened during times of             prepayment, and extension risk. MBS
        increased market volatility or other               react differently to changes in interest
        unusual market conditions. Tracking                rates than other bonds, and the prices
        error also may result because the Fund             of MBS may reflect adverse economic
        incurs fees and expenses, while the                and market conditions. Small
        Underlying Index does not.                         movements in interest rates (both
        U.S. Agency Debt Risk. The Fund                    increases and decreases) may quickly
        invests in unsecured bonds or                      and significantly reduce the value of
        debentures issued or guaranteed by the             certain MBS. MBS are also subject to
        U.S. government or one of its agencies             the risk of default on the underlying
        or sponsored entities. Certain debt                mortgage loans, particularly during
        issuances by U.S. government agencies              periods of economic downturn. Default
        or sponsored entities, including, among            or bankruptcy of a counterparty to a
        others, the Federal National Mortgage              to-be-announced (“TBA”) transaction
        Association (“Fannie Mae”) the Federal             would expose the Fund to possible
        Home Loan Mortgage Corporation                     losses.
        (“Freddie Mac”), the Federal Home Loan             U.S. Treasury Obligations Risk. U.S.
        Banks (“FHLB”), and the Tennessee                  Treasury obligations may differ from
        Valley Authority (“TVA”), are backed only          other securities in their interest rates,
        by the general creditworthiness and                maturities, times of issuance and other
        reputation of the U.S. government                  characteristics and may provide
        agency or sponsored entity and not the             relatively lower returns than those of
        full faith and credit of the U.S.                  other securities. Similar to other
        government and, as a result, are subject           issuers, changes to the financial
        to additional credit risk. To the extent           condition or credit rating of the U.S.
        that the U.S. government has provided              government may cause the value of the
        support to a U.S. agency or sponsored              Fund’s U.S. Treasury obligations to
        entity in the past, there can be no                decline.
        assurance that the U.S. government will            Valuation Risk. The price the Fund
        provide support in the future if it is not         could receive upon the sale of a security
        obligated to do so. Government                     or other asset may differ from the
        National Mortgage Association (“Ginnie             Fund’s valuation of the security or other
        Mae”) securities and certain foreign               asset and from the value used by the
        government debt issuances guaranteed               Underlying Index, particularly for
        by the U.S. government are backed by               securities or other assets that trade in
        the full faith and credit of the U.S.              low volume or volatile markets or that
        government.                                        are valued using a fair value
        U.S. Agency Mortgage-Backed                        methodology as a result of trade
        Securities Risk. The Fund invests in               suspensions or for other reasons. In
        MBS issued or guaranteed by the U.S.               addition, the value of the securities or

                                                     S-8
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        other assets in the Fund’s portfolio may                           lower or higher redemption proceeds,
        change on days or during time periods                              than they would have received had the
        when shareholders will not be able to                              Fund not fair-valued securities or used a
        purchase or sell the Fund’s shares.                                different valuation methodology. The
        Authorized Participants who purchase or                            Fund’s ability to value investments may
        redeem Fund shares on days when the                                be impacted by technological issues or
        Fund is holding fair-valued securities                             errors by pricing services or other third-
        may receive fewer or more shares, or                               party service providers.

        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.
                            Year by Year Returns1 (Years Ended December 31)

                        30%
                               21.68%                                                                19.91%
                                                         17.83%
                        20%                                                                                   15.95%
                                                                                   10.97%
                                        8.32%                              7.64%
                        10%

                         0%
                                                                  -2.97%                    -5.00%
                        -10%                    -8.72%
                        -20%

                               2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

          1
              The Fund’s year-to-date return as of March 31, 2021 was -9.88%
        The best calendar quarter return during the periods shown above was 15.37% in the
        3rd quarter of 2011; the worst was -7.38% 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).

                                                                    S-9
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                                       Average Annual Total Returns
                                (for the periods ended December 31, 2020)
                                                                        One Year     Five Years    Ten Years
        (Inception Date: 12/8/2009)
           Return Before Taxes                                           15.95%        9.55%         8.06%
           Return After Taxes on Distributions1                          14.42%        7.83%         6.33%
           Return After Taxes on Distributions and Sale of Fund
           Shares1                                                        9.48%        6.65%         5.58%
        Bloomberg Barclays U.S. Universal 10+ Year Index2
        (Index returns do not reflect deductions for fees,
        expenses, or taxes)                                              15.99%        9.62%         8.16%

             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.
             2
                 Index returns through October 22, 2012 reflect the performance of The ICE® BofAML 10+
                 Year US Corporate & Government IndexSM. Index returns beginning on October 23, 2012
                 through June 2, 2014 reflect the performance of the Bloomberg Barclays U.S. Long
                 Government/Credit Bond Index. Index returns beginning on June 3, 2014 reflect the
                 performance of the Bloomberg Barclays U.S. Universal 10+ Year Index.

                                                         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 2011 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 exchange-traded fund               BFA or other related companies may
        (commonly referred to as an “ETF”).               pay the intermediary for marketing
        Individual shares of the Fund may only            activities and presentations, educational
        be bought and sold in the secondary               training programs, conferences, the
        market through a broker-dealer.                   development of technology platforms
        Because ETF shares trade at market                and reporting systems or other services
        prices rather than at NAV, shares may             related to the sale or promotion of the
        trade at a price greater than NAV (a              Fund. These payments may create a
        premium) or less than NAV (a discount).           conflict of interest by influencing the
        An investor may incur costs attributable          broker-dealer or other intermediary and
        to the difference between the highest             your salesperson to recommend the
        price a buyer is willing to pay to                Fund over another investment. Ask your
        purchase shares of the Fund (bid) and             salesperson or visit your financial
        the lowest price a seller is willing to           intermediary’s website for more
        accept for shares of the Fund (ask)               information.
        when buying or selling shares in the
        secondary market (the “bid-ask
        spread”).

                                                   S-11
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        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 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
        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

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        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
        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.

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        Concentration Risk. The Fund may be susceptible to an increased risk of loss,
        including losses due to adverse events that affect the Fund’s investments more than
        the market as a whole, to the extent that the Fund’s investments are concentrated in
        the securities and/or other assets of a particular sovereign or quasi-sovereign entity or
        entities, country, group of countries, region, market, industry, group of industries,
        sector, market segment or asset class. The Fund may be more adversely affected by
        the underperformance of those securities and/or other assets, may experience
        increased price volatility and may be more susceptible to adverse economic, market,
        political or regulatory occurrences affecting those securities and/or other assets than
        a fund that does not concentrate its investments.
        Credit Risk. Credit risk is the risk that the issuer or guarantor of a debt instrument or
        the counterparty to a derivatives contract, repurchase agreement or loan of portfolio
        securities will be unable or unwilling to make its timely interest and/or principal
        payments when due or otherwise honor its obligations. There are varying degrees of
        credit risk, depending on an issuer’s or counterparty’s financial condition and on the
        terms of an obligation, which may be reflected in the issuer’s or counterparty’s credit
        rating. There is the chance that the Fund’s portfolio holdings will have their credit
        ratings downgraded or will default (i.e., fail to make scheduled interest or principal
        payments), or that the market’s perception of an issuer’s creditworthiness may
        worsen, potentially reducing the Fund’s income level or share price.
        Cybersecurity Risk. With the increased use of technologies such as the internet to
        conduct business, the Fund, Authorized Participants, service providers and the relevant
        listing exchange are susceptible to operational, information security and related
        “cyber” risks both directly and through their service providers. Similar types of
        cybersecurity risks are also present for issuers of securities in which the Fund invests,
        which could result in material adverse consequences for such issuers and may cause
        the Fund’s investment in such issuers to lose value. Unlike many other types of risks
        faced by the Fund, these risks typically are not covered by insurance. In general, cyber
        incidents can result from deliberate attacks or unintentional events. Cyber incidents
        include, but are not limited to, gaining unauthorized access to digital systems (e.g.,
        through “hacking” or malicious software coding) for purposes of misappropriating
        assets or sensitive information, corrupting data, or causing operational disruption.
        Cyberattacks may also be carried out in a manner that does not require gaining
        unauthorized access, such as causing denial-of-service attacks on websites (i.e.,
        efforts to make network services unavailable to intended users). Recently, geopolitical
        tensions may have increased the scale and sophistication of deliberate attacks,
        particularly those from nation-states or from entities with nation-state backing.
        Cybersecurity failures by, or breaches of, the systems of the Fund’s adviser, distributor
        and other service providers (including, but not limited to, index and benchmark
        providers, fund accountants, custodians, transfer agents and administrators), market
        makers, Authorized Participants or the issuers of securities in which the Fund invests,
        have the ability to cause disruptions and impact business operations, potentially
        resulting in: financial losses, interference with the Fund’s ability to calculate its NAV,
        disclosure of confidential trading information, impediments to trading, submission of
        erroneous trades or erroneous creation or redemption orders, the inability of the Fund
        or its service providers to transact business, violations of applicable privacy and other

                                                    3
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        laws, regulatory fines, penalties, reputational damage, reimbursement or other
        compensation costs, or additional compliance costs. In addition, cyberattacks may
        render records of Fund assets and transactions, shareholder ownership of Fund shares,
        and other data integral to the functioning of the Fund inaccessible or inaccurate or
        incomplete. Substantial costs may be incurred by the Fund in order to resolve or
        prevent cyber incidents in the future. While the Fund has established business
        continuity plans in the event of, and risk management systems to prevent, such cyber
        incidents, there are inherent limitations in such plans and systems, including the
        possibility that certain risks have not been identified and that prevention and
        remediation efforts will not be successful or that cyberattacks will go undetected.
        Furthermore, the Fund cannot control the cybersecurity plans and systems put in place
        by service providers to the Fund, issuers in which the Fund invests, the Index Provider,
        market makers or Authorized Participants. The Fund and its shareholders could be
        negatively impacted as a result.
        Geographic Risk. Some of the companies in which the Fund invests are located in
        parts of the world that have historically been prone to natural disasters, such as
        earthquakes, tornadoes, volcanic eruptions, droughts, floods, hurricanes or tsunamis,
        and are economically sensitive to environmental events. Any such event may adversely
        impact the economies of these geographic areas or business operations of companies
        in these geographic areas, causing an adverse impact on the value of the Fund.
        High Yield Securities Risk. Securities that are rated below investment-grade
        (commonly referred to as “junk bonds,” which may include those bonds rated below
        “BBB-” by S&P Global Ratings and Fitch, or below “Baa3” by Moody’s), or are unrated,
        may be deemed speculative, may involve greater levels of risk than higher-rated
        securities of similar maturity and may be more likely to default.
        The major risks of high yield securities investments include:
        䡲   High yield securities may be issued by less creditworthy issuers. Issuers of high yield
            securities may have a larger amount of outstanding debt relative to their assets than
            issuers of investment-grade bonds. In the event of an issuer’s bankruptcy, claims of
            other creditors may have priority over the claims of high yield securities holders,
            leaving few or no assets available to repay high yield securities holders.
        䡲   Prices of high yield securities are subject to extreme price fluctuations. Adverse
            changes in an issuer’s industry and general economic conditions may have a greater
            impact on the prices of high yield securities than on other higher rated fixed-income
            securities. The credit rating of a high yield security does not necessarily address its
            market value risk. Ratings and market value may change from time to time,
            positively or negatively, to reflect new developments regarding the issuer.
        䡲   Issuers of high yield securities may be unable to meet their interest or principal
            payment obligations because of an economic downturn, specific issuer
            developments, or the unavailability of additional financing.
        䡲   High yield securities frequently have redemption features that permit an issuer to
            repurchase the security from the Fund before it matures. If the issuer redeems high
            yield securities held by the Fund, the Fund may have to invest the proceeds in bonds
            with lower yields and may lose income.

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        䡲   High yield securities may be less liquid than higher rated fixed-income securities,
            even under normal economic conditions. There are fewer dealers in the high yield
            securities market, and there may be significant differences in the prices quoted for
            high yield securities by the dealers. Because high yield securities may be less liquid
            than higher rated fixed-income securities, judgment may play a greater role in
            valuing certain of the Fund’s securities than is the case with securities trading in a
            more liquid market.
        䡲   The Fund may incur expenses to the extent necessary to seek recovery upon default
            or to negotiate new terms with a defaulting issuer.
        Income Risk. The Fund’s income may decline if interest rates fall. This decline in
        income can occur because the Fund may subsequently invest in lower-yielding bonds
        as bonds in its portfolio mature, are near maturity or are called, bonds in the
        Underlying Index are substituted, or the Fund otherwise needs to purchase additional
        bonds. The Index Provider’s substitution of bonds in the Underlying Index may occur,
        for example, when the time to maturity for the bond no longer matches the Underlying
        Index’s stated maturity guidelines.
        Index-Related Risk. The Fund seeks to achieve a return that corresponds generally to
        the price and yield performance, before fees and expenses, of the Underlying Index as
        published by the Index Provider. There is no assurance that the Index Provider or any
        agents that may act on its behalf will compile the Underlying Index accurately, or that
        the Underlying Index will be determined, composed or calculated accurately. While the
        Index Provider provides descriptions of what the Underlying Index is designed to
        achieve, neither the Index Provider nor its agents provide any warranty or accept any
        liability in relation to the quality, accuracy or completeness of the Underlying Index or
        its related data, and they do not guarantee that the Underlying Index will be in line with
        the Index Provider’s methodology. BFA’s mandate as described in this Prospectus is to
        manage the Fund consistently with the Underlying Index provided by the Index Provider
        to BFA. BFA does not provide any warranty or guarantee against the Index Provider’s or
        any agent’s errors. Errors in respect of the quality, accuracy and completeness of the
        data used to compile the Underlying Index may occur from time to time and may not
        be identified and corrected by the Index Provider for a period of time or at all,
        particularly where the indices are less commonly used as benchmarks by funds or
        managers. In addition, there may be heightened risks associated with the adequacy
        and reliability of the information the Index Provider uses given the Fund’s exposure to
        emerging markets, as certain emerging markets may have less information available or
        less regulatory oversight. Such errors may negatively or positively impact the Fund and
        its shareholders. For example, during a period where the Underlying Index contains
        incorrect constituents, the Fund would have market exposure to such constituents and
        would be underexposed to the Underlying Index’s other constituents. Shareholders
        should understand that any gains from Index Provider errors will be kept by the Fund
        and its shareholders and any losses or costs resulting from Index Provider errors will
        be borne by the Fund and its shareholders.
        Unusual market conditions may cause the Index Provider to postpone a scheduled
        rebalance to the Underlying Index, which could cause the Underlying Index to vary
        from its normal or expected composition. The postponement of a scheduled rebalance

                                                     5
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