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		FOUNDED 1866

June 30, 2016

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Re: BlackRock U.S. Opportunities Portfolio, a series of BlackRock Funds^SM

(File Nos. 33-26305, Investment Company Act No. 811-05742)               

Ladies and Gentlemen:

On behalf of BlackRock Funds^SM, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the Supplement to the Investor and Institutional Shares Prospectus of BlackRock U.S. Opportunities Portfolio (the “Fund”) dated January 28, 2016, as filed pursuant to Rule 497(e) under the Securities Act of 1933 on June 17, 2016 (the “497 Filing”). The purpose of this filing is to submit the 497 Filing in XBRL for the Fund.

Any questions or comments on the 497 Filing should be directed to the undersigned at (212) 839-8615.

Very truly yours,

/s/ Jesse C. Kean

Jesse C. Kean

Enclosures

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.