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 August, 2026

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 Henrique Valadares, 28 – 9th floor 
20231-030 – 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 Form 20-F or Form 40-F. 

Form 20-F ___X___ 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___X____

B3: PETR3 (ON) | PETR4 (PN)

NYSE: PBR (ON) | PBRA (PN)

www.petrobras.com.br/ir

petroinvest@petrobras.com.br

+ 55 21 3224-1510

Disclaimer

This presentation contains some financial indicators that are not recognized by GAAP or the IFRS Accounting Standards. The indicators presented herein do not have standardized meanings and may not be comparable to indicators with a similar description used by others. We provide these indicators because we use them as measures of company performance and liquidity; they should not be considered in isolation or as a substitute for other financial metrics that have been disclosed in accordance with the IFRS Accounting Standards. See definitions of Adjusted EBITDA, LTM Adjusted EBITDA, Adjusted Cash and Cash Equivalents, Net Debt, Gross Debt, Free Cash Flow, and Leverage in the Glossary and their reconciliations in the sections Liquidity and Capital Resources, Reconciliation of LTM Adjusted EBITDA, Net Debt/LTM Adjusted EBITDA Metrics and Consolidated Debt.

TABLE OF CONTENTS

CONSOLIDATED RESULTS

The main functional currency of the Petrobras Group (the “Company”) is the Brazilian real, which is the functional currency of the parent company and its Brazilian subsidiaries. As the presentation currency of the Petrobras Group is the U.S. dollar, the results of operations in Brazilian reais are translated into U.S. dollars using the average exchange rates prevailing on a monthly basis.

Key Financial Information

Sales Revenues

Sales revenues were US$ 57,142 million for the period Jan-Jun/2026, a 35.7% increase (US$ 15,032 million) when compared to US$ 42,110 million for the period Jan-Jun/2025, mainly due to:

Cost of Sales

Cost of sales was US$ 26,309 million for the period Jan-Jun/2026, representing a 21.2% increase (US$ 4,599 million) compared to US$ 21,710 million in Jan-Jun/2025. This increase was mainly driven by a US$ 2,705 million increase in production taxes, mainly reflecting the higher average Brent crude prices, and a US$ 1,383 million increase in depreciation, depletion and amortization, mainly resulting from: (i) the start-up of the FPSOs Almirante Tamandaré (Búzios field, Santos basin) in February 2025 and Alexandre de Gusmão (Mero field, Campos basin) in May 2025; and (ii) an increase in depreciation of capitalized decommissioning costs, reflecting higher production and greater asset values in Jan-Jun/2026 compared to Jan-Jun/2025.

Income (Expenses)

Selling expenses were US$ 3,261 million for the period Jan-Jun/2026, a 37.2% increase (US$ 885 million) compared to US$ 2,376 million for the period Jan-Jun/2025, mainly due to higher logistical expenses related to higher volumes of crude oil and fuel oil exports.

Exploration costs were US$ 239 million for the period Jan-Jun/2026, a 52.0% decrease (US$ 259 million) compared to US$ 498 million for the period Jan-Jun/2025, mainly due to a US$ 208 million write-off of exploration expenditures related to blocks C-M-753 and C-M-789 in the Campos Basin, which was recognized in Jan-Mar/25 following management assessment that determined the projects were not economically feasible, leading to the decision to discontinue their development.

Other taxes were US$ 1,658 million for the period Jan-Jun/2026, a 563.2% increase (US$ 1,408 million) compared to US$ 250 million for the period Jan-Jun/2025, mainly due to:

Impairment reversals amounted to US$ 191 million for the period Jan-Jun/2026, a US$ 431 million increase compared to US$ 240 million impairment losses for the period Jan-Jun/2025. The 2026 result mainly reflected the US$ 405 million reversal related to UFN-III, following approval for project resumption and the resulting increase in the asset's recoverable value, partially offset by a US$ 227 million impairment loss associated with the postponement of the production restart of platform P-52, in the Roncador field, located in the Campos Basin.

Net finance income (expense)

Net finance income amounted to US$ 1,179 million for the period Jan-Jun/2026, representing a 57.3% (US$ 1,584 million) decrease compared to a net finance income of US$ 2,763 million recorded in Jan-Jun/2025, mainly due to a foreign exchange gain - Real x U.S. dollar of US$ 2,684 million in Jan-Jun/2026, as compared to a US$ 5,218 million gain in Jan-Jun/2025 reflecting a 5.9% appreciation of the Real/US$ exchange rate in Jan-Jun/2026 (06/30/2026: R$ 5.18/US$, 12/31/2025: R$ 5.50/US$) compared to a 11.9% appreciation in Jan-Jun/2025 (06/30/2025: R$ 5.46/US$, 12/31/2024: R$ 6.19/US$).

Income taxes

Income tax was an expense of US$ 6,737 million in Jan-Jun/2026, compared to an expense of US$ 4,765 million in Jan-Jun/2025. The increase was mainly due to higher net income before income taxes (US$ 23,393 million of income in Jan-Jun/2026 compared to a US$ 15,517 million income in Jan-Jun/2025), resulting in nominal income taxes computed based on Brazilian statutory corporate tax rates (34%) of US$ 7,953 million in Jan-Jun/2026 compared to a US$ 5,275 million in Jan-Jun/2025.

Net Income attributable to shareholders of Petrobras

Net income attributable to shareholders of Petrobras was US$ 16,627 million for the period Jan-Jun/2026, a US$ 5,919 million increase compared to a net income attributable to shareholders of Petrobras of US$ 10,708 million for the period Jan-Jun/2025, mainly due to higher gross profit (US$ 30,833 million in Jan-Jun/2026 compared to US$ 20,400 million in Jan-Jun/2025), partially offset by higher expenses (US$ 8,732 million of expenses in Jan-Jun/2026 compared to US$ 7,775 million of expenses in Jan-Jun/2025) and lower net finance income (US$ 1,179 million of income in Jan-Jun/2026 compared to US$ 2,763 million of income in Jan-Jun/2025).

CAPITAL EXPENDITURES (CAPEX)

In line with our Business Plan, our Capital Expenditures were primarily directed toward investment projects which Management believes are most profitable, relating to oil and gas production.

In Jan-Jun/2026, Capital Expenditures in the E&P segment totaled US$ 8,807 million, representing 84.6% of the CAPEX of the Company, a 21.9% increase when compared to US$ 7,224 million in Jan-Jun/2025, mainly due to the development of large projects in the pre-salt layer of the Santos Basin, especially in the Búzios and Sepia Fields, due to the progress in the construction works of the units, as well as in the Campos Basin projects, with the ramp-up of the Marlim Revitalization. CAPEX in Jan-Jun/2026 were mainly concentrated on: (i) the development of production in the pre-salt layer of the Santos Basin (US$ 4.54 billion); (ii) the development of production in the pre-salt and post-salt layers of the Campos Basin (US$ 1.53 billion); and (iii) exploratory investments (US$ 0.59 billion).

LIQUIDITY AND CAPITAL RESOURCES

(1) Free Cash Flow (FCF) is in accordance with the new Shareholder Remuneration Policy (“Policy”), approved in July 2023, which is the result of the equation: FCF = net cash provided by operating activities less the sum of acquisition of PP&E and intangible assets and acquisition of equity interests.

As of June 30, 2026, Cash and cash equivalents amounted to US$ 6,483 million and Adjusted Cash and Cash Equivalents totaled US$ 10,418 million.

In the six-month period ended June 30, 2026, we had net cash provided by operating activities of US$ 20,649 million and positive Free Cash Flow of US$ 11,514 million. This level of cash generation, together with proceeds from disposal of assets (divestments) of US$ 358 million, financial compensation from co-participation agreements of US$ 307 million, dividends received of US$ 71 million and proceeds from finance debt of US$ 1,931 million, were mainly allocated to: (a) debt prepayments and payments of principal and interest due in the period of US$ 4,205 million; (b) repayment of lease liability of US$ 5,216 million; (c) dividends paid to shareholders of Petrobras of US$ 3,742 million; (d) acquisition of PP&E and intangibles assets of US$ 9,072 million; and (e) investment in financial investments of US$ 897 million.

In the six-month period ended June 30, 2026, the Company repaid several finance debts, totaling US$ 4,205 million, notably: (i) US$ 2,342 million in the banking market, including US$ 1,360 million of prepayments in both the domestic and international markets; (ii) US$ 1,588 million in the capital markets, including the repurchase and optional redemption of US$ 694 million of bonds issued in the international capital markets; (iii) US$ 197 million to export credit agencies; (iv) US$ 54 million to development banks; and (v) US$ 25 million under other financing arrangements.

In the six-month period ended June 30, 2026, the Company raised US$ 1,931 million, notably through: (i) borrowings in the domestic banking market, amounting to US$ 948 million; (ii) borrowings from export credit agencies, amounting to US$ 590 million; and (iii) borrowings in the international banking market, amounting to US$ 320 million.

CONSOLIDATED DEBT

As of June 30, 2026, the Company has maintained its liability management strategy to improve the debt profile and to adapt to the maturity terms of the Company’s long-term investments.

Gross Debt increased by 1.5% (US$ 1,013 million) to US$ 70,806 million as of June 30, 2026, from US$ 69,793 million as of December 31, 2025, due to: (i) higher lease liabilities in the period (a US$ 1,620 million increase), partially offset by decreased finance debt (a US$ 607 million decrease). Gross Debt was maintained lower than the maximum level of US$ 75,000 million, with convergence to the level of US$ 65,000 million defined in the 2026-2030 Business Plan, mainly due to debt prepayments and scheduled repayments.

As of June 30, 2026, Net Debt decreased by 0.3% (US$ 205 million), reaching US$ 60,388 million, compared to US$ 60,593 million as of December 31, 2025, mainly due to a US$ 1,218 million increase in adjusted cash and cash equivalents, partially offset by the US$ 1,013 million increase in gross debt.

RECONCILIATION OF ADJUSTED EBITDA, LTM ADJUSTED EBITDA AND NET DEBT/LTM ADJUSTED EBITDA METRICS

LTM Adjusted EBITDA reflects the sum of the last twelve months of Adjusted EBITDA, which is computed by using the net income before net finance income (expense), income taxes, depreciation, depletion and amortization adjusted by items not considered part of the Company’s primary business, which include results in equity-accounted investments, results on disposal and write-offs of assets, impairment and results from co-participation agreements in bid areas.

LTM Adjusted EBITDA represents an alternative to the Company's operating cash generation. This measure is used to calculate the metric Net Debt/LTM Adjusted EBITDA, to support management’s assessment of liquidity and leverage.

Adjusted EBITDA and Net cash provided by operating activities – OCF

LTM Adjusted EBITDA and LTM Net cash provided by operating activities – OCF

Adjusted Cash and Cash Equivalents, Gross Debt, Net Debt, Net Cash provided by Operating Activities (LTM OCF), LTM Adjusted EBITDA, Gross Debt Net of Cash and Cash Equivalents/LTM OCF and Net Debt/LTM Adjusted EBITDA Metrics

The Net Debt/LTM Adjusted EBITDA metric is an important metric that supports our management in assessing the liquidity and leverage of Petrobras Group. This ratio is an important measure for management to assess the Company’s ability to pay off its debt, mainly because our Business Plan 2026-2030 defines US$ 75 billion as the maximum level for our Gross Debt, with convergence to the level of US$ 65 billion.

The following table presents the reconciliation of these metrics to the most directly comparable measures derived from the IFRS Accounting Standards captions:

RESULTS BY OPERATING BUSINESS SEGMENTS

Exploration and Production (E&P)

Financial information

^[1]

In the period Jan-Jun/2026, the gross profit for the E&P segment was US$ 21,289 million, an increase of 32.5% compared to US$ 16,073 million gross profit in the period Jan-Jun/2025, mainly due to increased higher production and Brent prices.

Operating income was US$ 19,773 million in the Jan-Jun/2026 period, an increase of 46.6% compared to US$ 13,489 million operating income in the period Jan-Jun/2025, mainly due to higher gross profit, and also to the lower expenses resulting from the provision for the equalization of expenditures and volumes related to the approval of the Jubarte Production Individualization Agreement that occurred in the same period last year.

In the period Jan-Jun/2026, production taxes amounted to US$ 8,060 million, an increase of 50.5% compared to US$ 5,354 million in the period Jan-Jun/2025 caused primarily by higher prices and production.

Operational information

(1) There were adjustments in the LPG production volumes from January to July 2025, due to the reprocessing of LPG data from the Boaventura Energy Complex.

Production of crude oil, NGL and natural gas was 3,281 mboed in the period Jan-Jun/2026, representing an increase of 15.1% compared to Jan-Jun/2025, mainly due to: (i) the ramp-up and capacity increases of the FPSOs Almirante Tamandaré and Marechal Duque de Caxias; (ii) the ramp-up of the FPSOs Maria Quitéria, Alexandre de Gusmão, Anna Nery, and Anita Garibaldi; (iii) start of production of the FPSOs P-78 and P-79; (iv) new wells from complementary projects in the Campos and Santos Basins; (v) higher operational efficiency and lower volume of losses due to maintenance stoppages in Campos Basin; and (vi) higher NGL production. These factors were partially offset by the natural decline in production.

Refining, Transportation and Marketing

Financial information

In the period Jan-Jun/2026, Refining, Transportation and Marketing gross profit increased US$ 7,290 million compared to the period Jan-Jun/2025, primarily driven by higher international margins, specifically diesel and jet fuel, the increase in oil exports and the effect of the realization of inventory acquired at lower Brent price. Operating income growth for the period primarily reflects the gross profit increase, partially mitigated by higher expenses, driven by increased freight costs, and higher taxes related to crude oil exports during the period.

The average refining cost in the period Jan-Jun/2026 was US$ 3.21/bbl, up 15.1% from Jan-Jun/2025, primarily due to inflationary effects on personnel costs related to the collective labor agreement and refinery revitalization activities, compounded by local currency appreciation in 2026. This increase was partially offset by higher oil processing volumes.

Operational information

(1) Changes presented in percentage points.

Domestic sales in the period Jan-Jun/2026 were 1,744 mbbl/d, an increase of 2.3% compared to Jan-Jun/2025.

Diesel sales volume rose 1.8% in Jan-Jun/2026 compared to Jan-Jun/2025 mainly due to the reduced sales from other producers. This positive effect was partially offset by the increase in the minimum biodiesel content in the blend from 14.0% to 15.0% and the increase in net imports by third parties. Gasoline sales volume grew by 1.7% in Jan-Jun/2026 compared to Jan-Jun/2025, because of higher share of gasoline compared to ethanol. Jet Fuel sales increased 5.3% due to the increase in economic activity boosting tourism and business travel, combined with real exchange rate appreciation. This growth was partially offset by airlines implementing fleet management measures in response to higher international jet fuel prices.

Total oil products output for the period Jan-Jun/2026 was 1,867 mbbl/d, representing an 8.7% increase compared to Jan-Jun/2025. In the first six months of 2026, the utilization factor of our refineries was 7.7 percentage points higher year-over-year, reflecting stronger regional demand amid geopolitical tensions in the Middle East. The increase in crude throughput was driven by higher refinery system availability in the current year.

Gas and Low Carbon Energies 

Financial information

In Jan-Jun/2026, the gross profit increased 17.4% in relation to Jan-Jun/2025 due to the higher volume of natural gas sold, higher domestic natural gas processing revenue resulting from the operation of the Itaboraí gas processing unit from the Rota 3 gas pipeline, and early commencement of energy capacity reserve auction contracts starting in August 2025.

The operating income in Jan-Jun/2026 also increased in relation to Jan-Jun/2025, due to higher gross profit and stable operating expenses.

Operational information

(1) Effective as of August 2025, according to the First Capacity Reserve Auction held in 2021.

The start-up of the Ibirité and Termorio thermal power plants occurred ahead of schedule in August 2025, making capacity available to meet the contracts awarded in 2021 Capacity Reserve Auction.

In Jan-Jun/2026, Petrobras’ thermal availability sales decreased by 20.4% compared to Jan-Jun/2025, due to the expiration of contracts. In the same period, sales of electricity increased by 53.4%, mainly driven by the optimization of the natural gas supply portfolio and the need to meet third-party steam demand.

On the natural gas supply side, national gas delivered in Jan-Jun/2026 grew 18.8% due to availability of gas from the Rota 3 gas pipeline and the operation of the Itaboraí gas processing unit. As a result of the increased supply of domestic production, there was a decrease in natural gas imports.

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: August 20, 2026

PETRÓLEO BRASILEIRO S.A–PETROBRAS

By: /s/ Fernando Sabbi Melgarejo

______________________________

Fernando Sabbi Melgarejo

Chief Financial Officer and Investor Relations Officer