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UNITED STATES

SECURITIES AND EXCHANGE\nCOMMISSION

Washington, D.C.\n20549

FORM 6-K

Report of Foreign Private\nIssuer
\nPursuant to Rule 13a-16 or 15d-16 of the

Securities Exchange\nAct of 1934

For the month of\nOctober, 2026

Commission File Number\n1-15106

PETRÓLEO BRASILEIRO\nS.A. – PETROBRAS

(Exact name of registrant\nas specified in its charter)

Brazilian Petroleum\nCorporation – PETROBRAS

(Translation of Registrant's\nname into English)

Avenida Henrique Valadares, 28 – 9th floor
\n20231-030 – Rio de Janeiro, RJ
\nFederative Republic of Brazil

(Address of principal\nexecutive office)

Indicate by check mark\nwhether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ___X___ Form\n40-F _______

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

Yes _______ No___X____

$\"\"$

Petrobras receives payment of new installments\nunder the Gasoline and Diesel Economic Subvention Programs

—

Rio de Janeiro, October 13, 2026 – Petróleo\nBrasileiro S.A. - Petrobras informs that it has received the following installments under the Economic Subvention Programs:

\n\n

R$ 39.6 million, representing the residual amount related to diesel sales on June 1 (Provisional\nMeasure No. 1,340). Effective June 2, Petrobras joined the subsidy program established under Provisional Measure No. 1,363, which required\nthe discontinuation of its eligibility for the subsidy provided for under Provisional Measure No. 1,340.;

\n\n

R$ 467.7 million, related to gasoline sales between July 1 and July 15 (Provisional Measure\nNo. 1,358);

\n\n

R$ 2.3 billion related to diesel sales during the period from July 1 and July 15 (Provisional\nMeasure No. 1,363).

With these payments, the cumulative amount received by Petrobras\nunder the diesel, gasoline, and LPG subsidy programs totals approximately R$ 16 billion.

www.petrobras.com.br/ir

For more information:

PETRÓLEO BRASILEIRO S.A. – PETROBRAS | Investor\nRelations

Email: petroinvest@petrobras.com.br/acionistas@petrobras.com.br\nAv. Henrique Valadares, 28 – 9th floor – 20231-030 – Rio de Janeiro, RJ. Tel.: 55 (21) 3224-1510/9947

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

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934,\nthe registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: October 13, 2026

PETRÓLEO BRASILEIRO S.A–PETROBRAS
\n
\nBy: /s/ Fernando Sabbi Melgarejo

______________________________

Fernando Sabbi Melgarejo

Chief Financial Officer and Investor Relations\nOfficer

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