DYNF iShares US Equity Factor Rotation Active ETF

December 23, 2019

VIA EDGAR

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Securities Act File No. 333-228832

Investment Company Act File No. 811-23402                                                                                  

Ladies and Gentlemen:

On behalf of BlackRock ETF Trust, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the Prospectus of BlackRock U.S. Equity Factor Rotation ETF (the “Fund”), dated November 27, 2019, as filed pursuant to Rule 497(c) under the Securities Act of 1933 on December 2, 2019 (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

John A. MacKinnon

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.