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| UNITED STATES | |
| SECURITIES AND EXCHANGE COMMISSION | |
| Washington, D.C. 20549 | |
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| FORM 6-K | |
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| Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 | |
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| For the month of August, 2026 | |
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| Comission File Number: 001-15276 | |
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| Itaú Unibanco Holding S.A. | |
| (Exact name of registrant as specified in its charter) |
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| Itaú Unibanco Holding S.A. | |
| (Translation of Registrant’s Name into English) |
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| Praça Alfredo Egydio de Souza Aranha, 100 - Torre Conceição |
| CEP 04344-902 São Paulo, SP, Brazil (Address of principal executive office) | |
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| 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 ☐ | |
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| 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 ☒ | |
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| 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 ☒ | |
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| 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 ☒ | |
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| If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): |
| 82– __________________ | |
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EXHIBIT INDEX
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| | 99.1 | ITAÚ UNIBANCO - Summarized Minutes of the Meeting of the Fiscal Council of August 4, 2026 |
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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. | |
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| | | Date: August 4, 2026. | |
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| | | 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 Fiscal Council DATE AND TIME: On August 04, 2026, at 2:00 p.m. CHAIR: Eduardo Hiroyuki Miyaki. QUORUM: The totality of the elected members, with the participation of the Councilors as permitted by item 4.6 of the Internal Charter of the Fiscal Council. RESOLUTION UNANIMOUSLY MADE: Eduardo Hiroyuki Miyaki was nominated for the position of Chairman of the Company's Supervisory Council and Cláudio José Coutinho Arromatte was nominated to replace the former in the case of absence or incapacity, for the current annual term of office. Following examination of the Company’s financial statements for the period from January to June 2026, the Councilors resolved to draw up the following opinion: “After examining the Company’s financial statements for the period from January to June 2026 and taking into consideration the unqualified report of PricewaterhouseCoopers Auditores Independentes, the opinion of the effective members of the Supervisory Council of ITAÚ UNIBANCO HOLDING S.A. is that these documents fairly reflect the capital structure, the financial position and the activities conducted by the Company in the period and meet the conditions necessary for the submission for the examination and approval of the Stockholders.” CLOSING: Once the work was completed, these minutes were signed after being drafted, read and approved by all. São Paulo (SP), August 04, 2026. (undersigned) Eduardo Hiroyuki Miyaki – Chairman of the Fiscal Council; Cláudio José Coutinho Arromatte and Marcelo Maia Tavares de Araújo – Councilors. Gustavo Lopes Rodrigues Investor Relations Officer