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 November, 2018

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 República do Chile, 65

20031-912 - 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  ☒            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  ☒

Reduction of Significant Shareholding Interest

Rio de Janeiro, November 29, 2018 – Petróleo Brasileiro S.A. – Petrobras, in compliance with article 12 of CVM Instruction no. 358, dated of 1/3/2002, informs that it was notified by BlackRock, Inc. (“BlackRock”) that the latter has sold preferred shares issued by the company, and as of November 27, 2018 it manages shareholding interest less than 5% of the preferred shares issued by Petrobras, and no longer qualifies as holder of significant shareholding interest in the capital stock of the company, as per the information below.

I. share interests held by BlackRock reached a combined 246,522,247 preferred shares and 16,613,768 American Depositary Receipts (ADRs), which represent preferred shares, totaling 279,749,783 preferred shares, equivalent to approximately 4.99% of total preferred shares issued by the company, and 2,232,900 cash-settlement derivative financial instruments referenced by preferred shares, which represent approximately 0.04% of total preferred shares issued by the company;

II. the purpose of the aforementioned share interests is strictly investment, with no intention to alter shareholding control or the administrative structure of Petrobras;

III. BlackRock did not celebrate any contracts or agreements governing the exercise of voting rights or the purchase and sale of securities issued by Petrobras;

IV. BlackRock has registered headquarters at 55 East 52^nd Street, New York City, New York State, 10022-0002, United States of America.

www.petrobras.com.br/ir

Contacts:

PETRÓLEO BRASILEIRO S.A.—PETROBRAS | Investor Relations Department | e-mail: petroinvest@petrobras.com.br

Av. República do Chile, 65 – 10th floor, 1002 – B – 20031-912 – Rio de Janeiro, RJ | Phone: 55 (21) 3224-1510 / 3224-9947

FORWARD-LOOKING STATEMENTS

This release includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, that are subject to risks and uncertainties. The forward-looking statements, which address the Company’s expected business and financial performance, among other matters, contain words such as “believe,” “expect,” “estimate,” “anticipate,” “optimistic,” “intend,” “plan,” “aim,” “will,” “may,” “should,” “could,” “would,” “likely,” and similar expressions. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date on which they are made. There is no assurance that the expected events, trends or results will actually occur. We undertake 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.

The Company’s actual results could differ materially from those expressed or forecast in any forward-looking statements as a result of a variety of assumptions and factors. These factors include, but are not limited to, the following: (i) failure to comply with laws or regulations, including fraudulent activity, corruption, and bribery; (ii) the outcome of ongoing corruption investigations and any new facts or information that may arise in relation to the “Lava Jato Operation”; (iii) the effectiveness of the Company’s risk management policies and procedures, including operational risk; and (iv) litigation, such as class actions or proceedings brought by governmental and regulatory agencies. A description of other factors can be found in the Company’s Annual Report on Form 20-F for the year ended December 31, 2017, and the Company’s other filings with the U.S. Securities and Exchange Commission.

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: November 29, 2018.