497

  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.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Jan. 31, 2018
Registrant Name	dei_EntityRegistrantName	BlackRock Funds IV
Central Index Key	dei_EntityCentralIndexKey	0001738074
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Aug. 31, 2018
Document Effective Date	dei_DocumentEffectiveDate	Aug. 31, 2018
Prospectus Date	rr_ProspectusDate	Aug. 10, 2018

XML

Aug. 10, 2018

BLACKROCK FUNDS IV

BlackRock Global Long/Short Credit Fund

(the “Fund”)

Supplement dated August 31, 2018 to the Summary Prospectus and Prospectus for Investor A Shares of the Fund, each dated August 10, 2018

Effective September 4, 2018, the following changes are made to the Fund’s Summary Prospectus and Prospectus, as applicable:

Footnote 1 to the Fund’s fee and expense table relating to the “Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)” for Investor A Shares in the section of the Summary Prospectus entitled “Fees and Expenses of the Fund” and the section of the Prospectus entitled “Fund Overview—Fees and Expenses of the Fund” is deleted in its entirety and replaced with the following:

1 A contingent deferred sales charge (“CDSC”) of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $250,000 or more. Shares of the Predecessor Fund (as defined below) purchased before September 4, 2018 will be subject to a CDSC of 0.75%.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

BlackRock Funds IV

Prospectus Date

rr_ProspectusDate

Aug. 10, 2018

Supplement [Text Block]

bf4_SupplementTextBlock

BLACKROCK FUNDS IV

BlackRock Global Long/Short Credit Fund

(the “Fund”)

Supplement dated August 31, 2018 to the Summary Prospectus and Prospectus for Investor A Shares of the Fund, each dated August 10, 2018

Effective September 4, 2018, the following changes are made to the Fund’s Summary Prospectus and Prospectus, as applicable:

Footnote 1 to the Fund’s fee and expense table relating to the “Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)” for Investor A Shares in the section of the Summary Prospectus entitled “Fees and Expenses of the Fund” and the section of the Prospectus entitled “Fund Overview—Fees and Expenses of the Fund” is deleted in its entirety and replaced with the following:

1 A contingent deferred sales charge (“CDSC”) of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $250,000 or more. Shares of the Predecessor Fund (as defined below) purchased before September 4, 2018 will be subject to a CDSC of 0.75%.

BlackRock Global Long/Short Credit Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf4_SupplementTextBlock

BLACKROCK FUNDS IV

BlackRock Global Long/Short Credit Fund

(the “Fund”)

Supplement dated August 31, 2018 to the Summary Prospectus and Prospectus for Investor A Shares of the Fund, each dated August 10, 2018

Effective September 4, 2018, the following changes are made to the Fund’s Summary Prospectus and Prospectus, as applicable:

Footnote 1 to the Fund’s fee and expense table relating to the “Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)” for Investor A Shares in the section of the Summary Prospectus entitled “Fees and Expenses of the Fund” and the section of the Prospectus entitled “Fund Overview—Fees and Expenses of the Fund” is deleted in its entirety and replaced with the following:

1 A contingent deferred sales charge (“CDSC”) of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $250,000 or more. Shares of the Predecessor Fund (as defined below) purchased before September 4, 2018 will be subject to a CDSC of 0.75%.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BlackRock Funds IV
Prospectus Date	rr_ProspectusDate	Aug. 10, 2018
Document Creation Date	dei_DocumentCreationDate	Aug. 31, 2018