SIDLEY AUSTIN LLP
787 SEVENTH AVENUE
NEW YORK, NY 10019
(212) 839 5300
(212) 839 5599 FAX
February 22, 2013
Securities and Exchange Commission
100 F Street, NE
Washington, DC 20549
|Re:||BlackRock Global Opportunities Portfolio, BlackRock International|
Opportunities Portfolio and BlackRock Managed Volatility Portfolio, each a series of BlackRock FundsSM
(File Nos. 33-26305, 811-05742)
Ladies and Gentlemen:
On behalf of BlackRock FundsSM, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the Prospectuses of BlackRock Global Opportunities Portfolio, BlackRock International Opportunities Portfolio and BlackRock Managed Volatility Portfolio (the Funds), dated January 28, 2013, as filed pursuant to Rule 497(e) under the Securities Act of 1933, on February 4, 2013 (the 497 Filing). The purpose of this filing is to submit the 497 Filing in XBRL for the Funds.
Any questions or comments on the 497 Filing should be directed to the undersigned at (212) 839-5583.
|Very truly yours,|
|/s/ Ellen W. Harris|
|Ellen W. Harris|
|cc:||Benjamin Archibald, Esq.|
BlackRock Advisors, LLC
Sidley Austin (NY) LLP is a Delaware limited liability partnership doing business as Sidley Austin LLP and practicing in affiliation with other Sidley Austin partnerships.