Petrobras (NYSE: PBR) takes 75% operating stake in São Tomé offshore Block 3

Rhea-AI Filing Summary

Petróleo Brasileiro S.A. – Petrobras reports that it has concluded the acquisition of an interest in, and the operatorship for, offshore Block 3 in São Tomé and Príncipe, Africa. After completion, the consortium is composed of Petrobras as operator with a 75% interest, Oranto with 15%, and the National Petroleum Agency of São Tomé and Príncipe with 10%.

The company states that this transaction is aligned with its Business Plan, focused on replenishing oil and gas reserves by exploring new frontiers in Brazil and abroad. Petrobras describes the assessment of new opportunities as a way to diversify its exploration portfolio and support long-term business sustainability.

Insights

Energy sector strategist

Petrobras adds a high-risk frontier block, extending its exploration reach in Africa.

The company has completed the acquisition of an interest in, and operatorship of, offshore Block 3 in São Tomé and Príncipe. Petrobras now holds a 75% operating stake, alongside Oranto at 15% and the National Petroleum Agency of São Tomé and Príncipe at 10%.

This move fits Petrobras’ stated strategy of replenishing oil and gas reserves and diversifying its exploration portfolio across new geographic frontiers. As an early-stage exploration asset, outcomes will depend on future drilling and appraisal results, which are not detailed here.

The emphasis on portfolio diversification and long-term sustainability suggests a strategic, rather than near-term production-driven, rationale. Investors will need future updates on seismic, drilling decisions, and any discoveries to gauge the block’s materiality.

Key Figures

Petrobras stake in Block 3: 75% Oranto stake in Block 3: 15% National Petroleum Agency stake: 10% +1 more

4 metrics

Petrobras stake in Block 3 75% Petrobras’ operating interest in offshore Block 3 after completion of the transaction

Oranto stake in Block 3 15% Consortium partner Oranto’s interest in offshore Block 3

National Petroleum Agency stake 10% National Petroleum Agency of São Tomé and Príncipe’s interest in Block 3

Announcement date July 9, 2026 Date Petrobras announced completion of the Block 3 acquisition

Key Terms

operatorship, exploration portfolio, Business Plan, forecasts

4 terms

operatorship technical

"concluded the acquisition of the interest in and operatorship for Block 3"

Operatorship is the formal role and responsibility held by the party that runs day-to-day operations of a joint project or asset, including making operational decisions, managing contractors, handling regulatory compliance, and preparing reports for partners. Investors care because the operator’s competence, cost control, safety record and decision-making directly affect project performance, timelines, and financial outcomes—like the driver of a team vehicle whose skill and choices determine travel speed and safety.

exploration portfolio financial

"seeks to diversify Petrobras’ exploration portfolio, promoting value creation"

Business Plan financial

"as set out in the company’s Business Plan"

forecasts regulatory

"This document may contain forecasts within the meaning of Section 27A"

Forecasts are forward-looking estimates of a company’s future performance—such as sales, profits, or cash flow—based on current information and assumptions. They matter to investors because they shape expectations about value and risk, much like a weather forecast helps decide whether to carry an umbrella: optimistic forecasts can lift share prices, while disappointing ones can trigger selling or reassessment of investment decisions.

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FAQ

What transaction did Petrobras (PBR) complete in São Tomé and Príncipe?

Petrobras completed the acquisition of an interest in, and the operatorship of, offshore Block 3 in São Tomé and Príncipe, Africa, expanding its exploration activities into a new geographic frontier.

What is Petrobras’ ownership share in Block 3 after this transaction?

After completion, Petrobras holds a 75% interest in Block 3 as operator. The remaining interests are held by Oranto with 15% and the National Petroleum Agency of São Tomé and Príncipe with 10%.

Who are Petrobras’ partners in Block 3 in São Tomé and Príncipe?

The Block 3 consortium consists of Petrobras as operator (75%), Oranto (15%), and the National Petroleum Agency of São Tomé and Príncipe (10%), according to the company’s disclosure.

How does the Block 3 acquisition fit Petrobras (PBR)’s strategy?

Petrobras states that acquiring Block 3 aligns with its Business Plan to replenish oil and gas reserves by exploring new frontiers, diversify its exploration portfolio, and support long-term business sustainability.

Does Petrobras (PBR) describe Block 3 as part of its reserve replenishment efforts?

Yes. Petrobras indicates that the Block 3 transaction supports its strategy of replenishing oil and gas reserves and assessing new opportunities to promote value creation and long-term sustainability.

When did Petrobras announce completion of the Block 3 acquisition?

Petrobras announced that it had concluded the Block 3 acquisition on July 9, 2026, following an earlier disclosure made on April 17, 2026 regarding the transaction.

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 July, 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 concludes acquisition of exploration block in São Tomé and Príncipe

—

Rio de Janeiro, July 9, 2026 – Petróleo Brasileiro S.A. – Petrobras, following up on the disclosure made on April 17, 2026, announces that it has concluded the acquisition of the interest in and operatorship for Block 3, located offshore São Tomé and Príncipe, in Africa.

Upon completion of the transaction, the consortium is now composed of Petrobras (operator, with a 75% interest) in partnership with Oranto (15%) and the National Petroleum Agency of São Tomé and Príncipe (10%).

This transaction is aligned with Petrobras’ strategy of replenishing its oil and gas reserves by exploring new frontiers, both in Brazil and abroad, as set out in the company’s Business Plan. The assessment of new opportunities seeks to diversify Petrobras’ exploration portfolio, promoting value creation and the long-term sustainability of its businesses.

www.petrobras.com.br/ir

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: July 9, 2026

PETRÓLEO BRASILEIRO S.A–PETROBRAS

By: /s/ Fernando Sabbi Melgarejo

______________________________

Fernando Sabbi Melgarejo

Chief Financial Officer and Investor Relations Officer