December 15th, 2015

BlackRock Announces Changes to Four iShares Treasury ETFs

Effective on or after March 31, 2016, BlackRock, Inc. will change the underlying indices for the following four iShares Treasury exchange traded funds (ETFs) from Barclays to ICE U.S. Treasury Bond Index Series indices:

Fund

Ticker

Prior Index

New Index

iShares 1-3 Year Treasury Bond ETF

SHY

Barclays U.S. 1-3 Year Treasury Bond Index ICE U.S. Treasury 1-3 Year Index
iShares 3-7 Year Treasury Bond ETF

IEI

Barclays U.S. 3-7 Year Treasury Bond Index ICE U.S. Treasury 3-7 Year Index
iShares 7-10 Year Treasury Bond ETF

IEF

Barclays U.S. 7-10 Year Treasury Bond Index ICE U.S. Treasury 7-10 Year Index
iShares 20+ Year Treasury Bond ETF

TLT

Barclays U.S. 20+ Year Treasury Bond Index ICE U.S. Treasury 20+ Year Index

Current shareholders are not required to take any actions as a result of these changes.

About BlackRock

BlackRock is a global leader in investment management, risk management and advisory services for institutional and retail clients. At December 31, 2015, BlackRock’s AUM was $4.645 trillion. BlackRock helps clients around the world meet their goals and overcome challenges with a range of products that include separate accounts, mutual funds, iShares® (exchange-traded funds), and other pooled investment vehicles. BlackRock also offers risk management, advisory and enterprise investment system services to a broad base of institutional investors through BlackRock Solutions®. As of December 31, 2015, the firm had approximately 13,000 employees in more than 30 countries and a major presence in global markets, including North and South America, Europe, Asia, Australia and the Middle East and Africa. For additional information, please visit the Company’s website at www.blackrock.com | Twitter: @blackrock_news | 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 700 funds globally across multiple asset classes and strategies and more than $1 trillion in assets under management as of December 31, 2015, 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 firm.1

1 Based on $4.645 trillion in AUM as of 12/31/15.

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 the iShares ETF and BlackRock Fund prospectus pages. Read the prospectus carefully before investing.

Investing involves risk, including possible loss of principal.

The iShares Funds are not sponsored, endorsed or issued by Barclays Capital Inc. or Interactive Data Corporation nor do they make any representation regarding the advisability of investing in the Funds. BlackRock is not affiliated with the companies listed above.

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

©2016 BlackRock. All rights reserved. iSHARES and BLACKROCK are registered trademarks of BlackRock. All other marks are the property of their respective owners. iS-17643

Contacts:

BlackRock, Inc.
Peter McKillop, 212-810-3737
Peter.McKillop@blackrock.com
or
Paul Young, 212-810-8142
Paul.Young@blackrock.com

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