Company: PBR
Filing Date: 2025-12-01
Form Type: 6-K
Source: 0001292814-25-004126
Chunk: 0

Company: PETROBRAS - PETROLEO BRASILEIRO SA
Filing Date: 2025-12-01
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 approval of redetermination of the Tupi Shared Reservoir

—

Rio de Janeiro, December 1, 2025 –Petróleo Brasileiro S.A. – Petrobras announces that it has been notified by Brazil’s National Agency of
Petroleum, Natural Gas and Biofuels (ANP) regarding the approval of the addendum to the Production Individualization Agreement (AIP) of
the Tupi Shared Reservoir, located in the Santos Basin, which becomes effective as of today.

The Tupi Shared Reservoir comprises:

| · | The BM-S-11 Concession Contract (Tupi field), operated                  
 by Petrobras (65%), in partnership with Shell (25%) and Petrogal (10%); |

| · | The Tupi South Block, under the Transfer of Rights                                              
 Agreement (Tupi South field), operated by Petrobras, which holds 100% of the participation; and |

| · | The Non-Contracted Area, owned by the Brazilian Federal                                               
 Government, represented by Pré-Sal Petróleo – PPSA