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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 - Notice to Shareholders: Payment Date of Interest on Equity |
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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. | |
Notice to Shareholders Payment of Interest on Capital Itaú Unibanco Holding S.A. ("Company") informs its shareholders that its Board of Directors has approved the payment, on August 28, 2026, of the Interest on Capital (“IoC”) previously announced in the Material Facts dated February 26, 2026, and May 28, 2026. Material Fact - Notice Date February 26, 2026 May 28, 2026 Total amount BRL 3.85 billion BRL 3.99 billion Gross amount per share BRL 0.34888 BRL 0.36188 Net amount per share1 BRL 0.287826 BRL 0.298551 Shareholding record date March 19, 2026 June 18, 2026 “Ex-rights” date March 20, 2026 June 19, 2026 The amounts will be paid equally to holders of common shares (ITUB3) and preferred shares (ITUB4). For further information, please visit on www.itau.com.br/investor-relations as follows: Menu > Investor Services > Contact IR. São Paulo - SP, August 04, 2026. Gustavo Lopes Rodrigues Investor Relations Officer 1 Subject to 17.5% withholding income tax, except for the corporate shareholders able to prove that they are immune or exempt from such withholding, in accordance with applicable legislation.