SIDLEY AUSTIN LLP 787 SEVENTH AVENUE NEW YORK, NY 10019 +1 212 839 5300 +1 212 839 5599 FAX   AMERICA • ASIA PACIFIC • EUROPE

September 10, 2018

VIA EDGAR

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re: BlackRock Global Long/Short Credit Fund, a series of BlackRock Funds IV

Securities Act File No. 333-224373

Investment Company Act File No. 811-23341                                                    

Ladies and Gentlemen:

On behalf of BlackRock Funds IV, 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 Summary Prospectus and Prospectus for Investor A Shares of BlackRock Global Long/Short Credit Fund (the “Fund”), each dated August 10, 2018, as filed pursuant to Rule 497(e) under the Securities Act of 1933 on August 31, 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 (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.