[6-K] Itau Unibanco Holding S.A. Current Report (Foreign Issuer)

Rhea-AI Filing Summary

Itaú Unibanco Holding S.A. reported that its Board of Directors unanimously approved the financial statements for the year ended December 31, 2025, after favorable reviews by the Audit Committee, Supervisory Council and Independent Auditors. The Board also confirmed payment of previously declared interest on capital on March 06, 2026, at a gross amount of R$0.369750 per share and a net amount of R$0.3142875 per share, based on shareholders of record as of December 9, 2025.

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 February, 2026

Comission 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 Conceição

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 - Summarized Minutes of the Meeting of the Board of Directors of February 4, 2026 at 3:00pm

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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: February 4, 2026.

Itaú Unibanco Holding S.A.

By: /s/ Gustavo Lopes Rodrigues

Name: Gustavo Lopes Rodrigues

Title: Investor Relations Officer.

Summarized Minutes of the Meeting of the Board of Directors DATE AND TIME: On February 4, 2026, at 3:00 p.m. CHAIR: Pedro Moreira Salles and Roberto Egydio Setubal – Co-chairmen. QUORUM: The majority of the members elected, with the participation of Board members as permitted by item 6.7.1. of the Bylaws. RESOLUTIONS UNANIMOUSLY ADOPTED: Once the meeting started, the Board members examined the financial statements for the year ended December 31, 2025, which were the subject matter of: (i) recommendation for approval, as documented in the Summary of the Audit Committee's Report; (ii) a favorable opinion of the Supervisory Council; (iii) an unqualified report of the Independent Auditors; and (iv) a declaration from the Board of Officers, agreeing with the opinions in the report of the Independent Auditors, with the financial statements and the management discussion and analysis report for the operation. Following due consideration, the Board members concluded on the accuracy of all the documents examined, unanimously approving them and authorizing their publication by means of the submission to the Brazilian Securities and Exchange Commission (CVM), B3 S.A. – Brasil, Bolsa, Balcão, the U.S. Securities and Exchange Commission (SEC), and the New York Stock Exchange (NYSE). At last, the Board members approved the payment, on March 06, 2026, of the interest on capital already declared by the Board of Directors on November 27, 2025, in the gross amount of R$0.369750 per share (net amount of R$0.3142875) per share, using the final stockholding position recorded on December 9, 2025, as the calculation basis CLOSING: Once the work was completed, Álvaro Felipe Rizzi Rodrigues, secretary to the Board, drafted this minute, which, after being read and approved by all, was signed. São Paulo (SP), February 04, 2026. (undersigned) Pedro Moreira Salles and Roberto Egydio Setubal – Co- Chairmen; Ricardo Villela Marino - Vice-Chairman; Alfredo Egydio Setubal, Ana Lúcia de Mattos Barretto Villela, Candido Botelho Bracher, Fabrício Bloisi Rocha, João Moreira Salles, Marcos Marinho Lutz, Maria Helena dos Santos Fernandes de Santana, Paulo Antunes Veras and Pedro Luiz Bodin de Moraes – Board Members. GUSTAVO LOPES RODRIGUES Investor Relations Officer