IBB iShares Biotechnology ETF

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 | Blog: www.blackrockblog.com | LinkedIn: www.linkedin.com/company/blackrock

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.

1 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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BlackRockMatt Kobussen, 646-231-0599matt.kobussen@blackrock.com