UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

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 of June, 2026

Commission File Number 1-15106

PETRÓLEO BRASILEIRO S.A. – PETROBRAS

(Exact name of registrant as specified in its charter)

Brazilian Petroleum Corporation – PETROBRAS

(Translation of Registrant's name into English)

Avenida Henrique Valadares, 28 – 9th floor
20231-030 – Rio de Janeiro, RJ
Federative 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 monetary adjustment of remuneration to shareholders related to the 2025 Fiscal Year

—

Rio de Janeiro, June 16, 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 06/22/2026, the payment of the second 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 06/22/2026, 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 June 29, 2026 by JP Morgan Chase, depositary bank of ADRs. Information and clarifications may be obtained at <www.adr.com>.

www.petrobras.com.br/ir

For more information:

PETRÓLEO BRASILEIRO S.A. – PETROBRAS | Investor Relations

Email: [email protected]/[email protected]

Av. Henrique Valadares, 28 – 9th floor – 20231-030 – Rio de Janeiro, RJ.

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

This document may contain forecasts within the meaning of Section 27A of the Securities Act of 1933, as amended (Securities Act), and Section 21E of the Securities Trading Act of 1934, as amended (Trading Act) that reflect the expectations of the Company's officers. The terms: "anticipates", "believes", "expects", "predicts", "intends", "plans", "projects", "aims", "should," and similar terms, aim to identify such forecasts, which evidently involve risks or uncertainties, predicted or not by the Company. Therefore, future results of the Company's operations may differ from current expectations, and the reader should not rely solely on the information included herein.

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: June 16, 2026

PETRÓLEO BRASILEIRO S.A–PETROBRAS

By: /s/ Fernando Sabbi Melgarejo

______________________________

Fernando Sabbi Melgarejo

Chief Financial Officer and Investor Relations Officer

PETROBRAS - PETROLEO BRASILEIRO SA 6-K