UNITED STATES

SECURITIES AND EXCHANGECOMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGNPRIVATE ISSUER

PURSUANT TO RULE 13a-16OR 15d-16

UNDER THE SECURITIESEXCHANGE ACT OF 1934

For the month of September,2024

Commission File Number001-15106

PETRÓLEO BRASILEIROS.A. - PETROBRAS

(Exact name of registrant as specified in its charter)

Brazilian PetroleumCorporation - PETROBRAS

(Translation of Registrant's name into English)

Avenida Henrique Valadares,28 20241-030 - Rio de Janeiro, RJFederative 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

PETROBRAS ANNOUNCES CLOSING OF OFFERING OF U.S.DOLLAR-DENOMINATED GLOBAL NOTES AND FINAL RESULTS ANDSETTLEMENT OF CASH TENDER OFFERS

RIODE JANEIRO, BRAZIL – September 16, 2024 – Petróleo Brasileiro S.A. – Petrobras (“Petrobras”) (NYSE: PBR) today announced (i) the settlement of the international capital markets offering of US$1.0 billion 6.000% Global Notes due 2035 (the “New Notes and such offering, the “New Notes Offering”), issued by its wholly-owned subsidiary, Petrobras Global Finance B.V. (“PGF”) and (ii) the final results and settlement of the previously announced cash tender offers by PGF, with respect to any and all of PGF’s outstanding notes of the series set forth in the table below (the “Notes” and such offers, the “Offers”).

The terms of the New Notes are as follows:

The settlement of the New Notes Offering occurred on September 13, 2024.

The following table sets forth the aggregate principal amount of Notes validly tendered and accepted for purchase in the Offers:

The Offers expired at 5:00 p.m., New York City time, on September 9, 2024 and settled on September 13, 2024.

The Offers were made pursuant to the terms and conditions set forth in the offer to purchase dated September 3, 2024, and the accompanying notice of guaranteed delivery (together, the “Offer Documents”).

The aggregate amount paid by PGF to holders whose Notes were accepted for purchase, excluding accrued and unpaid interest, was approximately US$918.4 million.

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PGF engaged BofA Securities, Inc., Banco Bradesco BBI S.A., HSBC Securities (USA) Inc., J.P. Morgan Securities LLC, Mizuho Securities USA LLC and Morgan Stanley & Co. LLC to act as joint bookrunners with respect to the New Notes Offering and to act as dealer managers with respect to the Offers. Global Bondholder Services Corporation acted as the depositary and information agent for the Offers.

This announcement is for informational purposes only, and does not constitute an offer to purchase or a solicitation of an offer to sell any securities.

The Offers were made solely pursuant to the Offer Documents. The Offer Documents have not been filed with, and have not been approved or reviewed by any federal or state securities commission or regulatory authority of any country. No authority has passed upon the accuracy or adequacy of the Offer Documents or any other documents related to the Offers, and it is unlawful and may be a criminal offense to make any representation to the contrary.

Notice to Prospective Investors in the United Kingdom

The communication of this announcement and any other documents ormaterials relating to the New Notes Offering and the Offers is not being made and such documents and/or materials have not been approvedby an authorized person for the purposes of Section 21 of the Financial Services and Markets Act 2000. This announcement and anyother documents related to the New Notes Offering and the Offers are for distribution only to persons who (i) have professional experiencein matters relating to investments falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion)Order 2005 (the “Order”), (ii) are persons falling within Article 49(2)(a) to (d) (“highnet worth companies, unincorporated associations, etc.”) of the Order, (iii) are outside the United Kingdom, (iv) aremembers or creditors of certain bodies corporate as defined by or within Article 43(2) of the Order, or (v) are personsto whom an invitation or inducement to engage in investment activity (within the meaning of section 21 of the Financial Services and MarketsAct 2000) in connection with the issue, sale or offer to purchase of any securities may otherwise lawfully be communicated or caused tobe communicated (all such persons together being referred to as “relevant persons”). This announcement and any other documentsrelated to the New Notes Offering and the Offers are directed only at relevant persons and must not be acted on or relied on by personswho are not relevant persons. Any investment or investment activity to which this process release and any other documents related to theNew Notes Offering and the Offers are available only to relevant persons and will be engaged in only with relevant persons.

Forward-Looking Statements

This announcement contains forward-looking statements. Forward-looking statements are information of a non-historical nature or which relate to future events and are subject to risks and uncertainties. No assurance can be given that the transactions described herein will be consummated or as to the ultimate terms of any such transactions. Petrobras undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information or future events or for any other reason.

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.

Date: September 16, 2024