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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 November, 2025 | |
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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 - Environmental, Social and Climate Responsibility Policy |
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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: November 12, 2025. | |
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| | | Itaú Unibanco Holding S.A. By: /s/ Gustavo Lopes Rodrigues Name: Gustavo Lopes Rodrigues Title: Investor Relations Officer. | |