西方石油美股招股说明书(2025-07-28版)

Our Common Stock is listed on the New York Stock Exchange (“NYSE”) under the symbol “OXY.” On July 28, 2025, the lastreported sale price of our Common Stock on the NYSE was $45.55 per share. The Warrants may be exercised at any time in accordance with their terms until August3, 2027, which is seven years after the date ofthe original issuance. Each Warrant entitles the holder to purchase from us one share of our Common Stock at an initial exercise price Occidental and Equiniti Trust Company, LLC, as Warrant Agent (the “Warrant Agreement”). The Warrants are listed on the NYSEunder the symbol “OXY WS.” Occidental will receive proceeds from the exercise of the Warrants. See “Use of Proceeds” in this prospectus supplement.Investing in our Common Stock involves risks. Please read “Risk Factors” in this prospectus supplement and in theaccompanying prospectus and other information included or incorporated by reference into this prospectus supplement andthe accompanying prospectus. Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved ordisapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or The date of this prospectus supplement is July 28, 2025. ABOUT THIS PROSPECTUS SUPPLEMENT different information. If anyone provides you with different or inconsistent information, you should not rely on it. This prospectussupplement, the accompanying prospectus and any applicable free writing prospectus do not constitute an offer to sell or thesolicitation of an offer to buy any securities other than the securities described in this prospectus supplement or an offer to sell or thesolicitation of an offer to buy those securities in any circumstances or jurisdiction in which such offer or solicitation is unlawful. The otherwise expressly stated or the context otherwise requires, the words “Occidental,” “we,” “us” and “our” as used in this prospectussupplement refer to Occidental Petroleum Corporation and its subsidiaries. S-ii FORWARD-LOOKING STATEMENTS This prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein and thereincontain forward-looking statements that involve risks and uncertainties that could materially affect expected results of operations, liquidity, cash flows and business prospects. Actual outcomes or results may differ from anticipated results, sometimes materially.Forward-looking and other statements regarding our sustainability efforts and aspirations are not an indication that these statements looking sustainability-related statements may be based on standards for measuring progress that are still developing, internal controlsand processes that continue to evolve and definitions, assumptions, data sources and estimates or measurements that are subject tochange in the future, including through rulemaking or guidance. Factors that could cause results to differ from those projected or •general economic conditions, including slowdowns and recessions, domestically or internationally; •assumptions about energy markets; •global and local commodity and commodity-futures pricing fluctuations and volatility; •supply and demand considerations for, and the prices of, our 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 our proved and unproved oil and gas properties or equity investments, or write-downs of productiveassets, causing charges to earnings; •unexpected changes in costs; and regulatory uncertainties), war (including the Russia-Ukraine war and conflicts in the Middle East) and politicalconditions and events; inflation;•availability of capital resources, levels of capital expenditures and contractual obligations; •the regulatory approval environment, including our ability to timely obtain or maintain permits or other governmentapprovals, including those necessary for drilling and/or development projects; •our 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; S-iii •uncertainties about the estimated quantities of oil, natural gas liquids (“NGL”) and natural gas reserves; •lower-than-expected production from development projects or acquisitions; •our ability to realize the anticipated benefits from prior or future streamlining actions to reduce fixedcosts, simplify orimprove processes and improve our compe