# EDGAR Filing Document

**Accession Number:** 0001132597
**File Stem:** 0001132597-26-000172
**Filing Date:** 2026-5
**Character Count:** 11989
**Document Hash:** 1cb276eb44c81daa167b7a377f253473
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001132597-26-000172.hdr.sgml**: 20260522

**ACCESSION NUMBER**: 0001132597-26-000172

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 6

**CONFORMED PERIOD OF REPORT**: 20260519

**FILED AS OF DATE**: 20260522

**DATE AS OF CHANGE**: 20260522

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Itau Unibanco Holding S.A.
- **CENTRAL INDEX KEY:** 0001132597
- **STANDARD INDUSTRIAL CLASSIFICATION:** STATE COMMERCIAL BANKS [6022]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 000000000
- **STATE OF INCORPORATION:** D5
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-15276
- **FILM NUMBER:** 261013326

**BUSINESS ADDRESS:**
- **STREET 1:** PC. ALFREDO EGYDIO DE SOUZA ARANHA, 100
- **STREET 2:** TORRE AE, 3 ANDAR, CEP 04344-902
- **CITY:** SAO PAULO
- **STATE:** D5
- **ZIP:** 00000
- **BUSINESS PHONE:** 55-11-5019-1723

**MAIL ADDRESS:**
- **STREET 1:** PC. ALFREDO EGYDIO DE SOUZA ARANHA, 100
- **STREET 2:** TORRE AE, 3 ANDAR, CEP 04344-902
- **CITY:** SAO PAULO
- **STATE:** D5
- **ZIP:** 00000

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Itau Unibanco Banco Multiplo S.A.
- **DATE OF NAME CHANGE:** 20090226

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BANCO ITAU HOLDING FINANCEIRA S A
- **DATE OF NAME CHANGE:** 20030319

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BANCO ITAU SA
- **DATE OF NAME CHANGE:** 20010117

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| | |
|:---|:---|
| **UNITED STATES** | **UNITED STATES** |
| **SECURITIES AND EXCHANGE COMMISSION** | **SECURITIES AND EXCHANGE COMMISSION** |
| **Washington, D.C. 20549** | **Washington, D.C. 20549** |
| **FORM 6-K** | **FORM 6-K** |
| &nbsp;&nbsp;**Report of Foreign Issuer<br>Pursuant to Rule 13a-16 or 15d-16<br>of the Securities Exchange Act of 1934** | &nbsp;&nbsp;**Report of Foreign Issuer<br>Pursuant to Rule 13a-16 or 15d-16<br>of the Securities Exchange Act of 1934** |
| &nbsp;&nbsp;**Report of Foreign Issuer<br>Pursuant to Rule 13a-16 or 15d-16<br>of the Securities Exchange Act of 1934** | &nbsp;&nbsp;**Report of Foreign Issuer<br>Pursuant to Rule 13a-16 or 15d-16<br>of the Securities Exchange Act of 1934** |
| &nbsp;&nbsp;**Report of Foreign Issuer<br>Pursuant to Rule 13a-16 or 15d-16<br>of the Securities Exchange Act of 1934** | &nbsp;&nbsp;**Report of Foreign Issuer<br>Pursuant to Rule 13a-16 or 15d-16<br>of the Securities Exchange Act of 1934** |
| **For the month of May, 2026** | **For the month of May, 2026** |
| **Comission File Number: 001-15276** | **Comission File Number: 001-15276** |
| **Itaú Unibanco Holding S.A.** | **Itaú Unibanco Holding S.A.** |
| (Exact name of registrant as specified in its charter) | (Exact name of registrant as specified in its charter) |
| **Itaú Unibanco Holding S.A.** | **Itaú Unibanco Holding S.A.** |
| (Translation of Registrant's Name into English) | (Translation of Registrant's Name into English) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Praça Alfredo Egydio de Souza Aranha, 100 - Torre Conceição** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Praça Alfredo Egydio de Souza Aranha, 100 - Torre Conceição** |
| &nbsp;&nbsp;&nbsp;**CEP 04344-902 São Paulo, SP, Brazil<br>(Address of principal executive office)** | &nbsp;&nbsp;&nbsp;**CEP 04344-902 São Paulo, SP, Brazil<br>(Address of principal executive office)** |
| &nbsp;&nbsp;&nbsp;**CEP 04344-902 São Paulo, SP, Brazil<br>(Address of principal executive office)** | &nbsp;&nbsp;&nbsp;**CEP 04344-902 São Paulo, SP, Brazil<br>(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. | 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 ☒ | &nbsp;&nbsp;&nbsp;&nbsp; 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): | 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 ☐ | &nbsp;&nbsp;&nbsp;&nbsp;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): | 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 ☐ | &nbsp;&nbsp;&nbsp;&nbsp;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. | 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 ☐ | &nbsp;&nbsp;&nbsp;&nbsp;No ☒ |
| If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): | If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): |
| 82– __________________ | 82– __________________ |

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**EXHIBIT INDEX**

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| | |
|:---|:---|
| **99.1** | <u>[ITAÚ UNIBANCO - Announcement to the market: Significant Ownership Interest](announcementtothemarket_.htm)</u> |

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| |
|:---|
| &nbsp;&nbsp;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. |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Date: May 19, 2026. |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Itaú Unibanco Holding S.A.**<br>By: /s/ Gustavo Lopes Rodrigues<br>Name: Gustavo Lopes Rodrigues<br>Title: Investor Relations Officer. |

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## Exhibit 99.1

![](announcementtothemarket_001.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;Announcement to the Market Significant Ownership Interest Itaú Unibanco Holding S.A. ("Company"), in compliance with the provision in Article 12 of Resolution No. 44/21 of the Brazilian Securities and Exchange Commission (CVM), announces to its stockholders and the market in general that it received a letter from GQG Partners LLC informing that they became the owners of preferred shares and American Depositary Receipts representing approximately 4.97% of the preferred shares issued by the Company. The complete letter is attached to this Announcement to the Market. São Paulo (SP), May 19, 2026. Gustavo Lopes Rodrigues Investor Relations Officer

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![](announcementtothemarket_002.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;São Paulo, May 15, 2026 São Paulo, 15 de Maio de 2026 ITAÚ UNIBANCO HOLDING S.A. Attn: Mr. Renato Lulia Jacob Group Head of Investor Relations and Market Intelligence Praça Alfredo Egydio de Souza Aranha, 100, Torre Olavo Setubal - Jabaquara, São Paulo - SP, 04344-902 Brazil ITAÚ UNIBANCO HOLDING S.A. Att: Sr. Renato Lulia Jacob Diretor de Relação de Investidores e Inteligência de Mercado Praça Alfredo Egydio de Souza Aranha, 100, Torre Olavo Setubal - Jabaquara, São Paulo - SP, 04344-902 Brasil Ref.: Decrease of significant ownership interest in ITAÚ UNIBANCO HOLDING S.A. Ref.: Redução de participação acionária relevante ao ITAÚ UNIBANCO HOLDING S.A. Dear Sirs, Prezados(as) Senhores(as), GQG Partners LLC ("GQG Partners"), a limited liability company, on behalf of its investment management clients, duly registered with the Securities Exchange Commission – SEC under the No. 0001697233, with its principal place of business at 350 E Las Olas Blvd, Floor 18, Fort Lauderdale, FL 33301, USA, in compliance with Article 12 of the Brazilian Securities Commission ("CVM") Resolution No. 44, dated august 23, 2021, as amended ("CVM Resolution 44/21"), hereby informs that the portfolio of clients under its management have disposed in the secondary market in the regular course of trade, through certain financial instruments, certain shares issued by ITAÚ UNIBANCO HOLDING S.A. ("Company"), thus holding, currently, 269,340,203 preferred shares and American Depositary Receipts, representing approximately four point ninety-seven per cent (4.97%) of all GQG Partners LLC ("GQG Partners"), uma sociedade limitada, em nome de seus clientes de gestão de carteiras de valores mobiliários, devidamente registrada perante a Securities Exchange Commission – SEC sob o nº 0001697233, com sua sede no endereço 350 E Las Olas Blvd, 18 andar, Fort Lauderdale, FL 33301, Estados Unidos da América, em cumprimento aos termos do artigo 12 da Resolução CVM 44, datada em 23 de agosto de 2021, conforme alterada ("Resolução CVM 44/21"), vem, à presença de V. Sas. informar que realizamos, nas carteiras de clientes sob sua gestão, alienação de certas ações emitidas pelo ITAÚ UNIBANCO HOLDING S.A. ("Companhia") em operações realizadas no curso regular do mercado secundário, mediante determinados instrumentos financeiros, retendo atualment 269,340,203 ações preferenciais e American Depositary Receipts, representando

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![](announcementtothemarket_003.jpg)

preferred shares issued by the Company. aproximadamente 4,97% (quatro ponto noventa e sete por cento) das ações preferenciais emitidas pela Companhia. GQG Partners also informs you that it does not hold proxy voting rights on behalf of its clients. GQG Partners também informa que não possui poderes de voto em nome de seus clientes. This is a minority investment not intended to change the control or administrative structure of the Company. Currently, GQG Partners does not intend to purchase any additional shares of the Company for its clients' accounts with the intent to acquire control or to change the management structure of the Company. Esse é um investimento minoritário que não tem o objetivo de alterar a composição do controle ou a estrutura administrativa da Companhia. Atualmente, GQG Partners não pretende adquirir, em nome de seus clientes, quaisquer ações adicionais de emissão da Companhia com a intenção de adquirir o controle ou alterar a estrutura administrativa da Companhia. The legal representative of GQG Partners' clients in Brazil, for purposes of Article 119 of Law 6,404, of December 15, 1976, as amended, is Citibank Distribuidora de Títulos e Valores Mobiliários SA, CNPJ No. 33.868.597/00001-40. O representante legal dos clientes da GQG Partners no Brasil, para fins do artigo 119 da Lei 6.404, de 15.12.1976, conforme alterada, é a Citibank Distribuidora de Títulos e Valores Mobiliários SA, CNPJ nº 33.868.597/00001-40. Please do not hesitate to contact us should you need any further clarifications. For any matters relating to this letter, please contact our attorneys in Brazil, Mr. José Luiz Homem de Mello (phone: (+55 11) 3247 8478; e-mail jhmello@pn.com.br; Mr. João Pedro Ribeiro Taveira (phone: (+55 11) 3247- 6372; e-mail jtaveira@pn.com.br); and Mr. Leonardo Duarte Moreira (phone: (+55 11) 3247-6337; e-mail ldmoreira@pn.com.br). Permanecemos à disposição de V. Sas. para quaisquer esclarecimentos que se façam necessários, e solicitamos que os contatos de V. Sas. com relação à presente correspondência, sejam feitos por meio de nossos advogados no Brasil, Sr. José Luiz Homem de Mello (phone: (+55 11) 3247 8478; e-mail jhmello@pn.com.br; Sr. João Pedro Ribeiro Taveira (phone: (+55 11) 3247-6372; e-mail jtaveira@pn.com.br); and Sr. Leonardo Duarte Moreira (phone: (+55 11) 3247-6337; e-mail ldmoreira@pn.com.br).

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![](announcementtothemarket_004.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;Very truly yours, Atenciosamente, Salvatore DiGangi Salvatore DiGangi Global Chief Compliance Officer GQG Partners LLC

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