6-K 1 a6-k_itubx12122025.htm 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, 2025 |
| 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 - REFERENCE FORM (V10)

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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: December 11, 2025. |
|  |  | Itaú Unibanco Holding S.A. By: /s/ Gustavo Lopes Rodrigues Name: Gustavo Lopes Rodrigues Title: Investor Relations Officer. |