Exhibit 99.906CERT
 
Certification Pursuant to Rule 30a-2(b) under the 1940 Act and
Section 906 of the Sarbanes-Oxley Act of 2002
 
Pursuant to 18 U.S.C. § 1350, the undersigned officer of BlackRock FundsSM (the “Registrant”), hereby certifies, to the best of their knowledge, that the Registrant’s Report on Form N-CSR for the period ended July 31, 2025 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.
Date: September 23, 2025 
/s/ John M. Perlowski                         
John M. Perlowski
Chief Executive Officer (principal executive officer) of
BlackRock FundsSM
 
Pursuant to 18 U.S.C. § 1350, the undersigned officer of BlackRock FundsSM (the “Registrant”), hereby certifies, to the best of their knowledge, that the Registrant’s Report on Form N-CSR for the period ended July 31, 2025 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.
Date: September 23, 2025 
/s/ Trent Walker                                  
Trent Walker
Chief Financial Officer (principal financial officer) of
BlackRock FundsSM
 
 
 
This certification is being furnished pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as amended, and 18 U.S.C. § 1350 and is not being filed as part of the Form N-CSR with the Securities and Exchange Commission.