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