6-K

UNITED STATES

SECURITIES AND EXCHANGECOMMISSION

Washington, D.C.20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of the

Securities Exchange Act of 1934

For the month ofMay, 2026

Commission File Number1-15106

PETRÓLEO BRASILEIROS.A. – PETROBRAS

(Exact name of registrant as specified in its charter)

Brazilian PetroleumCorporation – PETROBRAS

(Translation of Registrant's name into English)

Avenida Henrique Valadares, 28 – 9th floor 20231-030 – Rio de Janeiro, RJFederative Republic of 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 ___X___ Form 40-F _______

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes _______ No___X____

Petrobras informs about the monetaryadjustment of remuneration to shareholders related to the 2025 Fiscal Year

—

Rio de Janeiro, May 14, 2026 – Petróleo Brasileiro S.A. – Petrobras, following up on the Material Fact published on 03/05/2026 and the Communication on 04/16/2026, informs that it will carry out, on 05/20/2026, the payment of the first installment of remuneration to shareholders related to the fourth quarter of 2025, with the shareholder position of 04/22/2026 as the record date.

The payment of this installment will be made in the form of interest on capital whose gross value per share will be adjusted by the Selic rate from 12/31/2025 to 05/20/2026, as follows:

It should be noted that income tax will be levied, in accordance with current tax legislation, both on the amount paid in the form of interest on capital as well as on the amount corresponding to the monetary adjustment.

Credit instructions

The payment will be made by Banco Bradesco S.A. (Bradesco), institution depositary of book-entry

shares. All shareholders, who have their registration duly updated, will have their rights automatically

credited to their bank accounts on the payment date. More information can be obtained through any Bradesco branch or by calling 0800-7011616.

For shareholders with custody in B3, the payment will be done by deposit brokers.

For holders of American Depositary Receipts (ADRs) negotiated on the New York Stock Exchange (NYSE), the payment will be made as of May 28, 2026 by JP Morgan Chase, depositary bank of ADRs. Information and clarifications may be obtained at <www.adr.com>.

www.petrobras.com.br/ri

Para mais informações**:**

PETRÓLEO BRASILEIRO S.A. – PETROBRAS| Relações com Investidores

E-mail: [email protected]/[email protected]

Av. Henrique Valadares 28 – 9º andar – 20031-030 – Rio de Janeiro, RJ

Tel.: 55 (21) 3224-1510/9947

Este documento pode conter previsões segundo o significado da Seção 27A da Lei de Valores Mobiliários de 1933, conforme alterada (Lei de Valores Mobiliários) e Seção 21E da lei de Negociação de Valores Mobiliários de 1934 conforme alterada (Lei de Negociação) que refletem apenas expectativas dos administradores da Companhia. Os termos: “antecipa”, “acredita”, “espera”, “prevê”, “pretende”, “planeja”, “projeta”, “objetiva”, “deverá”, bem como outros termos similares, visam a identificar tais previsões, as quais, evidentemente, envolvem riscos ou incertezas, previstos ou não, pela Companhia. Portanto, os resultados futuros das operações da Companhia podem diferir das atuais expectativas, e, o leitor não deve se basear exclusivamente nas informações aqui contidas.

SIGNATURES

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: May 14, 2026

PETRÓLEO BRASILEIRO S.A–PETROBRASBy: /s/ Fernando Sabbi Melgarejo

______________________________

Fernando Sabbi Melgarejo

Chief Financial Officer and Investor Relations Officer