6-K

UNITED STATES

SECURITIES AND EXCHANGECOMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATEISSUER

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

UNDER THE SECURITIES EXCHANGEACT OF 1934

For the month of December,2025

Commission File Number001-15106

PETRÓLEO BRASILEIROS.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, 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 REDEMPTION PRICE FOR8.750% GLOBAL NOTES DUE 2026

**RIO DE JANEIRO, BRAZIL – December 23, 2025 –**Petróleo Brasileiro S.A. – Petrobras (“Petrobras”) (NYSE: PBR) announces that its wholly-owned subsidiary Petrobras Global Finance B.V. (“PGF”) has delivered notices to the holders of the outstanding 8.750% Global Notes due 2026 (the “Notes”) announcing the redemption price for the Notes. As previously announced, the redemption date for the Notes will be December 29, 2025 (the “Redemption Date”).

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^(1)^Per US$1,000. Figures have been rounded for ease of presentation.^(2)^Redemption price includes make-whole premium.

^(3)^Accrued interest on the principal amount from November 23, 2025 to (but not including) the Redemption Date.

Payment on the Notes will be made prior to 3:00 pm New York City time on the business day preceding the Redemption Date by credit to the account of The Bank of New York Mellon (the “Trustee”), as paying agent for the Notes.

The Trustee will cause funds to be paid to The Depositary Trust Company for further payment to its participants in the aggregate amount of US$350,462,301.08 (or approximately US$1,018.29 per US$1,000 principal amount of the Notes), which constitutes the redemption price for the Notes. The redemption price includes a make-whole premium of US$6,295,301.08 (or approximately US$18.29 per US$1,000 principal amount of the Notes). In addition to the redemption price, holders will receive accrued and unpaid interest on the principal amount of the Notes from November 23, 2025 to (but not including) the Redemption Date in the amount of US$3,011,461.25 (or approximately US$8.75 per US$1,000 principal amount of the Notes).

On the Redemption Date, the redemption prices, including accrued and unpaid interest, will become due and payable. Interest on the Notes will cease to accrue on and after the Redemption Date. Upon the redemption, the Notes and the related guaranty by Petrobras will be cancelled and any obligation thereunder extinguished.

PGF intends to fund the amounts necessary to redeem the Notes with available cash on hand.

For more information or if you have any questions regarding this notice, please contact Petrobras’s investor relations department at petroinvest@petrobras.com.br.

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: December 23, 2025