Company: PBR
Filing Date: 2025-09-15
Form Type: 6-K
Source: 0001292814-25-003293
Chunk: 0

Company: PETROBRAS - PETROLEO BRASILEIRO SA
Filing Date: 2025-09-15
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 September, 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 participation in exploratory block in São Tomé and Príncipe

—

Rio de Janeiro, September 12, 2025 –Petróleo Brasileiro S.A. – Petrobras informs that it has concluded the acquisition of a 27.5% stake in Block
4, located in São Tomé and Príncipe, Africa. With this acquisition, Petrobras joins the consortium of the aforementioned
block, which includes Shell, the operator of the asset (30%), as well as Galp (27.5%) and ANP-STP (15%).

Petrobras has been active in São
Tomé and Príncipe since February 2024, when it acquired a 45% stake in Blocks 10 and 13, and a 25% stake in Block 11.

This transaction strengthens Petrobras’
exploratory activities on the African continent, with the purpose of portfolio diversification, and is aligned with the company’s
long-term strategy, aiming to replenish oil and gas reserves through exploration of new frontiers and partnership operations.

The