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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 July, 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 - Announcement to the Market - Completion of the Itaú Colombia transaction |
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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: July 31, 2026. | |
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| | | Itaú Unibanco Holding S.A. By: /s/ Gustavo Lopes Rodrigues Name: Gustavo Lopes Rodrigues Title: Investor Relations Officer. | |
Announcement to the Market Itaú Unibanco Holding S.A. ("Company") informs its shareholders and the market that its subsidiary, Banco Itaú Colombia S.A. ("Itaú Colombia"), has completed the transfer of certain assets, liabilities, and contracts related to its retail banking operations for individuals (the "Transaction") to Banco de Bogotá S.A. at book value. The Transaction comprises approximately BRL 9.7 billion1 in loan portfolio (net of provisions) and BRL 7.2 billion1 in deposits. The net value of the Transaction is approximately BRL 2.5 billion¹. The Transaction has no material impact on the Company's regulatory capital ratio. Following the closing of the Transaction, Itaú Colombia will focus its operations on the Corporate Banking segment, in line with the strategy of maximizing return on capital. For further information, please refer to the details attached as Annex I. São Paulo - SP, July 31, 2026. Gustavo Lopes Rodrigues Investor Relations Officer 1 Based on the exchange rate as of June 30, 2026.
Announcement to the Market Annex I The full Material Event Notice is available on Itaú Chile's Investor Relations website and may be accessed through the following URL: (https://api.mziq.com/mzfilemanager/v2/ d/4a2da77a-1e3e-41d5-8eb2-01dc7b15a10f/1eb1e44a-56e9-684f-ea3c-ca2e2d668bba? origin=2 ).