6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16

of the Securities Exchange Act of 1934

For the month of December, 2023

Commission File Number: 001-15276

Itaú Unibanco Holding S.A.

(Exact name of registrant as specified in its charter)

Itaú Unibanco Holding S.A.

(Translation of Registrant’s Name into English)

Praça Alfredo Egydio de Souza Aranha, 100-Torre Conceicao

CEP 04344-902 São Paulo, SP, Brazil

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F  ☒            Form 40-F  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Yes  ☐                No  ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Yes  ☐                No  ☒

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ☐                No  ☒

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

82–                         

EXHIBIT INDEX

99.1 ITAÚ UNIBANCO - Level 2 Subordinated Financial Bills

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: December 15, 2023.

Itaú Unibanco Holding S.A.
By:	/s/ Renato Lulia Jacob
Name:	Renato Lulia Jacob
Title:	Group Head of Investor Relations and Market Intelligence
By:	/s/ Alexsandro Broedel
Name:	Alexsandro Broedel
Title:	Chief Financial Officer

EX-99.1

ITAÚ UNIBANCO HOLDING S.A. CNPJ 60.872.504/0001-23 A Publicly-Held Company NIRE 35300010230 ANNOUNCEMENT TO THE MARKET Level 2 Subordinated Financial Bills Itaú Unibanco Holding S.A. (“Company”) announces to the market that it has issued Level 2 Subordinated Financial Bills (“Financial Bills”) in the total amount of R$1.5 billion. These Financial Bills mature in January 2034. In accordance with Resolution No. 122 of the Central Bank of Brazil, Financial Bills will compose the Tier 2 Capital of the Company’s Referential Equity with an estimated impact of 0.12 p.p. on its Tier 2 capitalization ratio. Financial Bills were issued with the objective of optimizing the Company´s capital structure given its asset growth. The proceeds raised from the issuance of these Financial Bills will be allocated either directly and/or indirectly through its subsidiaries for payment of rents. Financial Bills were underwritten by Opea Securitizadora S.A., which in turn has issued Real Estate Receivables Certificates (“CRIs”) backed by Real Estate Credit Notes (“CCIs”), which represent Financial Bills. CRIs were distributed through the public offering automatically registered with CVM and allocated to qualified and professional investors. São Paulo (SP), December 15, 2023. RENATO LULIA JACOB Group Head of Investor Relations and Market Intelligence