Market Overview

BlackRock Announces Share Split for iShares Nasdaq Biotechnology ETF

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BlackRock (NYSE:BLK) announces that the Board of Trustees of iShares
Trust has authorized a share split for iShares Nasdaq Biotechnology ETF
(IBB).

The Board has approved a 3-for-1 split for the fund for shareholders of
record as of the close of business on November 28, 2017, payable after
the close of trading on November 30, 2017. The 3-for-1 split will lower
the share price and increase the number of outstanding shares. The total
value of shares outstanding is not affected by the split.

                         
Fund Name     Ticker     Inception Date     NAV/Share

(as of 11/3/17)

    Proposed Forward Split Ratio
iShares Nasdaq Biotechnology ETF     IBB     10/04/2007     $317.02     3 for 1

About BlackRock

BlackRock helps investors build better financial futures. As a fiduciary
to our clients, we provide the investment and technology solutions they
need when planning for their most important goals. As of September 30,
2017, the firm manages approximately $5.977 trillion in assets on behalf
of investors worldwide. For additional information on BlackRock, please
visit www.blackrock.com
| Twitter: @blackrock
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About iShares

iShares® is a global leader in exchange-traded funds
(ETFs), with more than a decade of expertise and commitment to
individual and institutional investors of all sizes. With over 800 funds
globally across multiple asset classes and strategies and more than $1.5
trillion in assets under management as of September 30, 2017, iShares
helps clients around the world build the core of their portfolios, meet
specific investment goals and implement market views. iShares
funds are powered by the expert portfolio and risk management of
BlackRock, trusted to manage more money than any other investment firm1.

Based on $5.977 trillion in AUM as of 9/30/17

Carefully consider the Funds' investment objectives, risk factors,
and charges and expenses before investing. This and other information
can be found in the Funds' prospectuses or, if available, the summary
prospectuses which may be obtained by visiting 
www.iShares.com or www.blackrock.com.
Read the prospectus carefully before investing.

Investing involves risk, including possible loss of principal.

The iShares Funds are distributed by BlackRock Investments, LLC
(together with its affiliates, "BlackRock").

Funds that concentrate investments in specific industries, sectors,
markets or asset classes may underperform or be more volatile than other
industries, sectors, markets or asset classes and than the general
securities market.

The iShares Funds are not sponsored, endorsed, issued, sold or promoted
by the NASDAQ OMX Group, Inc., nor does this company make any
representation regarding the advisability of investing in the Funds.
BlackRock Investments, LLC is not affiliated with the company listed
above.

©2017 BlackRock. All rights reserved. iSHARES and BLACKROCK are
registered trademarks of BlackRock. All other marks are the property of
their respective owners. 298570

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