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
May, 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 announces adherence to the new economic subvention
program
—
Rio
de Janeiro, May 20, 2026 – Petróleo Brasileiro S.A. – Petrobras, announces that its Board of Directors, at a meeting
held today, approved the company’s adherence to the economic subvention program for producers and importers of petroleum-based
fuels, established by Provisional Measure (MP) 1,358, dated May 13, 2026. The economic subvention established under this MP covers amounts
related to the production and importation of gasoline and road diesel oil, in accordance with applicable legislation.
Given the optional nature of the program
and its potential benefit, this adherence is considered compatible with the company’s interests. This new adherence adds to the
existing subvention programs related to the commercialization of road diesel oil in Brazil’s national territory already established
by the Brazilian Federal Government.
The effective signing of the new adherence
agreement will be subject to the publication and analysis of the ordinance to be issued by the Minister of Finance, as well as the related
regulation necessary for the implementation of the economic subvention, as provided for in MP 1,358.
It is important to note that Petrobras
maintains its commercial strategy, considering its market share and the sustainable optimization of its refining assets and profitability,
avoiding the transfer to domestic market of the cyclical volatility of international prices and the BRL exchange rate.
This adherence preserves the company’s
flexibility in implementing its commercial strategy. Petrobras remains committed to responsible, balanced, and transparent conduct.
www.petrobras.com.br/ri
For more information:
PETRÓLEO BRASILEIRO S.A. – PETROBRAS
| Investor Relations
Email: petroinvest@petrobras.com.br/acionistas@petrobras.com.br
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: May 20, 2026
PETRÓLEO BRASILEIRO S.A–PETROBRAS
By: /s/ Fernando Sabbi Melgarejo
______________________________
Fernando Sabbi Melgarejo
Chief Financial Officer and Investor Relations
Officer