Form 485BXT BLACKROCK FUNDS

As filed with the Securities and Exchange Commission on May 29, 2025

Securities Act File No. 33-26305

Investment Company Act File No. 811-05742

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-1A

(Check appropriate box or boxes)

BLACKROCK FUNDS^SM

(Exact Name of Registrant as Specified in Charter)

100 Bellevue Parkway Wilmington, Delaware 19809

(Address of Principal Executive Office)

Registrant’s Telephone Number, including Area Code (800) 441-7762

John M. Perlowski

BlackRock Funds^SM

50 Hudson Yards

New York, New York 10001

United States of America

(Name and Address of Agent for Service)

Copies to:

 It is proposed that this filing will become effective (check appropriate box)

 If appropriate, check the following box:

   Title of Securities Being Registered: Shares of Beneficial Interest, par value $0.001 per share.

Explanatory Note

This Post-Effective Amendment No. 1260 under the Securities Act of 1933, as amended (the “Securities Act”) to the registration statement on Form N-1A (the “Registration Statement”) of BlackRock Funds^SM (the “Registrant”) is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act solely for the purpose of delaying, until June 12, 2025, the effectiveness of the registration statement for BlackRock Sustainable Aware Advantage Global Equity Fund (formerly, BlackRock Sustainable Advantage Global Equity Fund), filed in Post-Effective Amendment No. 1252 on March 6, 2025, pursuant to paragraph (a)  of Rule 485 under the Securities Act.

This Post-Effective Amendment No. 1260 incorporates by reference the information contained in Post-Effective Amendment No. 1252 to the Registrant’s Registration Statement.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for the effectiveness of this Post-Effective Amendment to its Registration Statement pursuant to Rule 485(b)(1)(iii) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York and the State of New York, on May 29, 2025.

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.