Company: PBR
Filing Date: 2025-12-04
Form Type: 6-K
Source: 0001292814-25-004164
Chunk: 0

Company: PETROBRAS - PETROLEO BRASILEIRO SA
Filing Date: 2025-12-04
Form: 6-K
Chunk 0
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<div align='center'>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 December, 2025

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____</div>

Petrobras announces results of PPSA’s Non-Contracted Areas Auction—

Rio de Janeiro, December 4, 2025– Petróleo Brasileiro S.A. - Petrobras informs that it has acquired the rights and obligations of the Union in Mero and Atapu units at the Non-Contracted Areas Auction held today by Pré-Sal Petróleo S.A. – PPSA.

The consortium formed by Petrobras (80%), in partnership with Shell Brasil Petróleo Ltda (20%), acquired the Union’s 3.500% participation in the production sharing agreement of the Mero shared reservoir, offering a final amount of R$ 7,791,844,310.00. With this acquisition, Petrobras increases its participation in the Mero shared reservoir from 38.60% to 41.40%.

Additionally, also in partnership with Shell (26.76%), Petrobras (73.24%) acquired the Union’s 0.950% participation in the production sharing agreement of the Atapu shared reservoir, offering a final amount of R$ 1