SIDLEY AUSTIN LLP 60 STATE STREET 36TH FLOOR BOSTON, MA 02109 +1 617 223 0300 +1 617 223 0301 FAX   AMERICA • ASIA PACIFIC • EUROPE

December 19, 2018

VIA EDGAR

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re: BlackRock Advantage Emerging Markets Fund, a series of BlackRock Funds^SM

Securities Act File No. 33-26305

Investment Company Act File 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 Investor and Institutional shares Prospectus of BlackRock Advantage Emerging Markets Fund (the “Fund”), dated November 28, 2018, as filed pursuant to Rule 497(c) under the Securities Act of 1933 on December 3, 2018 (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 (617) 223-0373.

Very truly yours,

/s/ Louisa Kiu

Louisa Kiu

Enclosures

cc: Benjamin Archibald, Esq.

BlackRock Advisors, LLC

Jesse C. Kean

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.