Petrobras (PBR) files 6-K with guaranties and indentures for 2030 and 2036 notes

Rhea-AI Filing Summary

Petróleo Brasileiro S.A. – Petrobras filed a Form 6-K that is incorporated by reference into its and Petrobras Global Finance B.V.’s Form F-3 shelf registration and related prospectus supplement dated September 3, 2025. The filing mainly provides exhibits tied to new debt securities.

The exhibits include guaranties for notes due 2030 and 2036, seventh and eighth supplemental indentures, and forms of 5.125% Global Notes due 2030 and 6.250% Global Notes due 2036, together with legal opinions from Petrobras’ internal counsel, Cleary Gottlieb Steen & Hamilton LLP, and Heussen B.V.

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

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September, 2025

Commission File Number 001-15106

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 
20241-030 - 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 of Form 20-F or Form 40-F.

Form 20-F x Form 40-F ¨

This report on Form 6-K shall be deemed to be incorporated by reference into the Registration Statement on Form F-3 of Petróleo Brasileiro S.A. — Petrobras (No. 333-283981) and Petrobras Global Finance B.V. – PGF (No. 333-283981-01) and the related prospectus supplement dated September 3, 2025.

Exhibit 4.1 — Guaranty for the 2030 Notes

Exhibit 4.2 — Guaranty for the 2036 Notes

Exhibit 4.3 — Seventh Supplemental Indenture

Exhibit 4.4 — Eighth Supplemental Indenture

Exhibit 4.5 — Form of 5.125% Global Notes due 2030 (included in Exhibit 4.3)

Exhibit 4.6 — Form of 6.250% Global Notes due 2036 (included in Exhibit 4.4)

Exhibit 5.1 — Opinion of internal counsel to Petrobras

Exhibit 5.2 — Opinion of Cleary Gottlieb Steen & Hamilton LLP, U.S. counsel to PGF and Petrobras

Exhibit 5.3 — Opinion of Heussen B.V., Dutch counsel to PGF

SIGNATURE

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.

	PETRÓLEO BRASILEIRO S.A--PETROBRAS
	By:	/s/ Andre Gameiro Rua
		Name: Andre Gameiro Rua
		Title: Attorney-in-fact
	By:	/s/ Lucas Tavares de Mello
		Name: Lucas Tavares de Mello
		Title: Attorney-in-fact

Date: September 10, 2025

FAQ

What does Petrobras (PBR) disclose in this Form 6-K filing?

The Form 6-K from Petrobras furnishes exhibits related to debt securities issued under its Form F-3 shelf. It includes guaranties, supplemental indentures, forms of notes due 2030 and 2036, and supporting legal opinions from Brazilian, U.S., and Dutch counsel.

How is the Petrobras (PBR) Form 6-K linked to its Form F-3 shelf?

This Form 6-K is expressly incorporated by reference into the Form F-3 registration statement for Petrobras and Petrobras Global Finance B.V. It supports the related prospectus supplement dated September 3, 2025 by supplying detailed contractual and legal documentation for the referenced notes.

What debt instruments are referenced in Petrobras (PBR) September 2025 Form 6-K?

The filing lists forms of 5.125% Global Notes due 2030 and 6.250% Global Notes due 2036. These appear as exhibits included in the seventh and eighth supplemental indentures, together with associated guaranties and legal opinions from multiple law firms.

Which legal opinions are included with the Petrobras (PBR) Form 6-K?

The Form 6-K includes legal opinions from Petrobras’ internal counsel, Cleary Gottlieb Steen & Hamilton LLP as U.S. counsel to PGF and Petrobras, and Heussen B.V. as Dutch counsel to PGF, supporting the documentation for the 2030 and 2036 notes.

What types of contractual documents accompany Petrobras (PBR) notes in this filing?

The filing includes guaranties for the 2030 and 2036 notes and the seventh and eighth supplemental indentures. It also provides the forms of the 5.125% Global Notes due 2030 and 6.250% Global Notes due 2036, forming the core contractual package.