•Strong operational performance drove operating cash flow of $2.8 billion and operating cash flow before working capital of $3.2 billion

•Capital spending of $1.8 billion and contributions from noncontrolling interest of $39 million resulted in quarterly free cash flow before working capital of $1.5 billion

•Total company average production exceeded the high end of guidance with 1,465 Mboed

•Midstream and marketing exceeded the high end of guidance for pre-tax adjusted income

•Repaid $1.3 billion of debt during the third quarter of 2025, reducing Occidental's principal debt balance to $20.8 billion

•Earnings per diluted share of $0.65 and adjusted earnings per diluted share of $0.64

HOUSTON — November 10, 2025 — Occidental (NYSE: OXY) today announced net income attributable to common stockholders of $661 million, or $0.65 per diluted share, and adjusted income attributable to common stockholders of $649 million, or $0.64 per diluted share, for the third quarter of 2025.

"Occidental’s third quarter results are a testament to the exceptional operational execution of our teams and the strength of our upstream portfolio. We achieved notable outperformance across our oil and gas assets as well as within our midstream and marketing operations," said President and Chief Executive Officer Vicki Hollub. "The sale of OxyChem is an important milestone in the strategic transformation of our company and will enable us to further strengthen our balance sheet, accelerate shareholder returns and unlock high-return opportunities across our core oil and gas business."

Oil and gas pre-tax income was $1.3 billion for the third quarter of 2025. Excluding items affecting comparability, the increase in third quarter oil and gas income, compared to the second quarter of 2025, was due to higher crude oil volumes and prices. For the third quarter of 2025, average WTI and Brent marker prices were $64.93 per barrel and $68.14 per barrel, respectively. Average worldwide realized crude oil prices increased by 2% from the prior quarter to $64.78 per barrel. Average worldwide realized natural gas liquids prices decreased by 5% from the prior quarter to $19.60 per barrel. Average domestic realized gas prices increased by 11% from the prior quarter to $1.48 per thousand cubic feet (Mcf).

Total average global production for the third quarter of 2025 exceeded the high end of guidance with 1,465 thousand barrels of oil equivalent per day (Mboed). Average production for Permian, Rockies & Other Domestic, Gulf of America and International were 800 Mboed, 288 Mboed, 139 Mboed and 238 Mboed, respectively.

OxyChem pre-tax income was $197 million for the third quarter of 2025. The decrease in third quarter OxyChem income, compared to the second quarter of 2025, was primarily due to lower realized prices and volumes across most product lines, partially offset by favorable raw material costs.

Midstream and marketing pre-tax income was $93 million for the third quarter of 2025. Excluding items affecting comparability, the third quarter midstream and marketing results exceeded the high end of guidance. Compared to the second quarter of 2025, the decrease in third quarter midstream and marketing income reflected lower Waha-to-Gulf-Coast gas spreads and higher expenses due to the increase in activities in the low-carbon venture businesses, partially offset by higher sulfur prices at Al Hosn. WES equity method investment income for the third quarter was $156 million.

This press release refers to adjusted income (loss), operating cash flow before working capital, capital expenditures, net of noncontrolling interest, free cash flow before working capital and adjusted selling, general and administrative (SG&A), other operating and non-operating expenses, which are supplemental measures not calculated in accordance with generally accepted accounting principles in the United States (GAAP). These non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation or as an alternative to the comparable GAAP financial measures. Definitions of adjusted income (loss) and a reconciliation to net income (loss), along with operating cash flow from continuing operations before working capital, capital expenditures, net of noncontrolling interest, free cash flow before working capital and adjusted SG&A, other operating and non-operating expenses and a reconciliation to the comparable GAAP financial measures, are included in the financial schedules of this press release. Occidental’s definition of adjusted income (loss), operating cash flow from continuing operations before working capital, capital expenditures, net of noncontrolling interest, free cash flow before working capital and adjusted SG&A, other operating and non-operating expenses may differ from similarly titled measures provided by other companies in our industry and as a result may not be comparable.

Occidental is an international energy company with assets primarily in the United States, the Middle East and North Africa. We are one of the largest oil and gas producers in the U.S., including a leading producer in the Permian and DJ basins, and offshore Gulf of America. Our midstream and marketing segment provides flow assurance and maximizes the value of our oil and gas, and includes our Oxy Low Carbon Ventures subsidiary, which is advancing leading-edge technologies and business solutions that economically grow our business while reducing emissions. Our chemical subsidiary OxyChem manufactures the building blocks for life-enhancing products. We are dedicated to using our global leadership in carbon management to advance a lower-carbon world. Visit oxy.com for more information.

This press release contains forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, including, but not limited to, statements about Occidental’s expectations, beliefs, plans or forecasts, including the proposed sale of OxyChem to Berkshire Hathaway Inc. (Berkshire) and the benefits of such sale. All statements other than statements of historical fact are “forward-looking statements” for purposes of federal and state securities laws, including, but not limited to: any projections of earnings, revenue or other financial items or future financial position or sources of financing; any statements of the plans, strategies and objectives of management for future operations or business strategy; any statements regarding future economic conditions or performance; any statements of belief; and any statements of assumptions underlying any of the foregoing. Words such as “estimate,” “project,” “predict,” “will,” “would,” “should,” “could,” “may,” “might,” “anticipate,” “plan,” “intend,” “believe,” “expect,” “aim,” “goal,” “target,”

“objective,” "commit," "advance," “likely” or similar expressions that convey the prospective nature of events or outcomes are generally indicative of forward-looking statements. You should not place undue reliance on these forward-looking statements, which speak only as of the date of this press release unless an earlier date is specified. Unless legally required, Occidental does not undertake any obligation to update, modify or withdraw any forward-looking statements as a result of new information, future events or otherwise.

Forward-looking statements involve estimates, expectations, projections, goals, forecasts, assumptions, risks and uncertainties. Actual outcomes or results may differ from anticipated results, sometimes materially. Factors that could cause results to differ from those projected or assumed in any forward-looking statement include, but are not limited to: Occidental’s ability to consummate the proposed transaction with Berkshire (the Transaction); the possibility that any or all of the conditions to the Transaction may not be satisfied or waived, including the failure to obtain the regulatory approvals required for the Transaction on the terms expected or on the anticipated schedule or at all; the occurrence of any event, change or other circumstance that could give rise to the termination of the purchase agreement relating to the Transaction; the effect of the announcement or pendency of the Transaction on our ability to attract, motivate or retain key executives and employees, our ability to maintain relationships with our customers, vendors, service providers and others with whom we do business, or our operating results and business generally; risks related to the Transaction diverting management’s attention from our ongoing business operations; that the Transaction may not achieve some or all or any of the anticipated benefits or be completed in accordance with expected plans and timelines; general economic conditions, including slowdowns and recessions, domestically or internationally; Occidental’s indebtedness and other payment obligations, including the need to generate sufficient cash flows to fund operations; Occidental’s ability to successfully monetize select assets and repay or refinance debt and the impact of changes in Occidental’s credit ratings or future increases in interest rates; assumptions about energy markets; global and local commodity and commodity-futures pricing fluctuations and volatility; supply and demand considerations for, and the prices of, Occidental’s products and services; actions by the Organization of the Petroleum Exporting Countries (OPEC) and non-OPEC oil producing countries; results from operations and competitive conditions; future impairments of Occidental's proved and unproved oil and gas properties or equity investments, or write-downs of productive assets, causing charges to earnings; unexpected changes in costs; government actions (including the effects of announced or future tariff increases and other geopolitical, trade, tariff, fiscal and regulatory uncertainties), war (including the Russia-Ukraine war and conflicts in the Middle East) and political conditions and events; inflation, its impact on markets and economic activity and related monetary policy actions by governments in response to inflation; availability of capital resources, levels of capital expenditures and contractual obligations; the regulatory approval environment, including Occidental's ability to timely obtain or maintain permits or other government approvals, including those necessary for drilling and/or development projects; Occidental's ability to successfully complete, or any material delay of, field developments, expansion projects, capital expenditures, efficiency projects, acquisitions or divestitures; risks associated with acquisitions, mergers and joint ventures, such as difficulties integrating businesses, uncertainty associated with financial projections or projected synergies, restructuring, increased costs and adverse tax consequences; uncertainties and liabilities associated with acquired and divested properties and businesses; uncertainties about the estimated quantities of oil, NGL and natural gas reserves; lower-than-expected production from development projects or acquisitions; Occidental’s ability to realize the anticipated benefits from prior or future streamlining actions to reduce fixed costs, simplify or improve processes and improve Occidental’s competitiveness; exploration, drilling and other operational risks; disruptions to, capacity constraints in, or other limitations on the pipeline systems that deliver Occidental’s oil and natural gas and other processing and transportation considerations; volatility in the securities, capital or credit markets, including capital market disruptions and instability of financial institutions; health, safety and environmental (HSE) risks, costs and liability under existing or future federal, regional, state, provincial, tribal, local and international HSE laws, regulations and litigation (including related to climate change or remedial actions or assessments); legislative or regulatory changes, including changes relating to hydraulic fracturing or other oil and natural gas operations, retroactive royalty or production tax regimes, and deep-water and onshore drilling and permitting regulations; Occidental's ability to recognize intended benefits from its business strategies and initiatives, such as Occidental's low-carbon ventures businesses or announced greenhouse gas emissions reduction targets or net-zero goals; changes in government grant or loan programs; potential liability resulting from pending or future litigation, government investigations and other proceedings; disruption or interruption of production or manufacturing or facility damage due to accidents, chemical releases, labor unrest, weather, power outages, natural disasters, cyber-attacks, terrorist acts or insurgent activity; the scope and duration of global or regional health pandemics or epidemics, and actions taken by government authorities and other third parties in connection therewith; the creditworthiness and performance of Occidental's counterparties, including financial institutions, operating partners and other parties; failure of risk management; Occidental’s ability to retain and hire key personnel; supply, transportation and labor constraints; reorganization or restructuring of Occidental’s operations; changes in state, federal or international tax rates, deductions, incentives or credits; and actions by third parties that are beyond Occidental's control.

Additional information concerning these and other factors that may cause Occidental's results of operations and financial position to differ from expectations can be found in Occidental’s other filings with the U.S. Securities and Exchange Commission, including Occidental’s Annual Report on Form 10-K for the year ended December 31, 2024, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K.

Schedule # and Description

•Before Tax Allocations

•After Tax Allocations    

•Reported Results

•Items Affecting Comparability

•Adjusted Results (non-GAAP)

•Reported Results

•Items Affecting Comparability

•Adjusted Results (non-GAAP)

•Reconciliation - Diluted EPS

•Detail of Capital Expenditures and Depreciation, Depletion and Amortization

•Free Cash Flow (non-GAAP)

•MBOE/D

•By Commodity

•MBOE/D

•Realized Prices and Related Index Prices

Segment Results Before Tax Allocations

(amounts in millions, except per share and effective tax rate amounts)

(a) Non-GAAP Measure. Adjusted income is a non-GAAP measure. Occidental defines adjusted income as net income excluding the effects of significant transactions and events that affect earnings but vary widely and unpredictably in nature, timing and amount. These events may recur, even across successive reporting periods. This non-GAAP measure is not meant to disassociate those items from management’s performance, but rather is meant to provide useful information to investors interested in comparing Occidental’s earnings performance between periods. Reported net income is considered representative of management’s performance over the long term, and adjusted income is not considered to be an alternative to net income reported in accordance with GAAP.

Segment Results After Tax Allocations

(Amounts in millions, except per share and effective tax rate amounts)