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In exchange for each $1,000 principal amount of Old Notes that is validly tendered prior to 5:00 p.m., New York City time, on                    , 2019, unless extended by us (such date and time, as it may be extended, the “Early Participation Date”) and not validly withdrawn, holders will receive the total consideration set out in the table above (the “Total Consideration”), which consists of $1,000 principal amount of Oxy Notes and a cash amount of $1.00. The Total Consideration includes an early participation premium set out in the table above (the “Early Participation Premium”), which consists of $30 principal amount of Oxy Notes.

In exchange for each $1,000 principal amount of Old Notes that is validly tendered after the Early Participation Date but prior to the Expiration Date (as defined below) and not validly withdrawn, holders will receive only the exchange consideration set out in the table above (the “Exchange Consideration”), which is equal to the Total Consideration less the Early Participation Premium and therefore consists of $970 principal amount of Oxy Notes and a cash amount of $1.00.

Except where otherwise indicated, the term “aggregate principal amount,” when used in reference to the Zero Coupon Senior Notes due 2036 (the “Zero Coupon Notes”), refers to the accreted amount as of                 , 2019, the anticipated Settlement Date (as defined below), and will be approximately $        per $1,000,000 aggregate principal amount at maturity of Zero Coupon Notes. The term “aggregate principal amount at maturity,” when used in reference to the Zero Coupon Notes, refers to the aggregate principal amount payable at maturity, which is $1,000,000 for each $1,000,000 of fully accreted Zero Coupon Notes. For the avoidance of doubt, the $1.00 cash amount for the series of Old Notes corresponding to the Zero Coupon Notes (the “Old Zero Coupon Notes”) will be paid based on the aggregate principal amount (or accreted value) as of the Settlement Date of such Old Zero Coupon Notes validly tendered.

No additional payment will be made for a holder’s consent to the proposed amendments to the Old Notes Indentures (as defined below).

Tenders of Old Notes in connection with any of the exchange offers may be withdrawn at any time prior to the Expiration Date of the applicable exchange offer. Following the Expiration Date, tenders of Old Notes may not be validly withdrawn unless we are otherwise required by law to permit withdrawal. Consents to the proposed amendments may be revoked at any time prior to 5:00 p.m., New York City time, on           , 2019, unless extended by us (such date and time, as it may be extended, the “Consent Revocation Deadline”), but may not be revoked at any time thereafter. Consents may be revoked only by validly withdrawing the associated tendered Old Notes. A valid withdrawal of tendered Old Notes prior to the Consent Revocation Deadline will be deemed to be a concurrent revocation of the related consent to the proposed amendments to the applicable Old Notes Indenture, and a revocation of a consent to the proposed amendments prior to the Consent Revocation Deadline will be deemed to be a concurrent withdrawal of the related tendered Old Notes. However, a valid withdrawal of Old Notes after the Consent Revocation Deadline will not be deemed a revocation of the related consent and your consent will continue to be deemed delivered.

Each Oxy Note issued in exchange for an Old Note will have an interest rate and maturity that is identical to the interest rate and maturity of the tendered Old Note, as well as identical interest payment dates and optional redemption prices (subject to certain technical changes to ensure that the calculations of the treasury rate are consistent with the methods used in the new notes issuance (as defined below)). No accrued but unpaid interest will be paid on the Old Notes in connection with the exchange offers. Interest on the applicable Oxy Note will, however, (a) accrue from and including the most recent interest payment date of the tendered Old Note and (b) if the regular record date for the first interest payment date would be a date prior to the Settlement Date, the record date for such first interest payment date will be the day immediately preceding such interest payment date. Subject to the minimum denominations as described herein, the principal amount of each Oxy Note will be rounded down, if necessary, to the nearest whole multiple of $1,000, and we will pay cash equal to the remaining portion, if any, of the exchange price of such Old Note. The exchange offers will expire at 5:00 p.m., New York City time, on           , 2019, unless extended (the “Expiration Date”). You may withdraw tendered Old Notes at any time prior to the Expiration Date. As further described in this prospectus, if your valid withdrawal of your tendered Old Notes occurs after the Consent Revocation Deadline, you will not be able to revoke the related consent to the proposed amendments described below. As of the date of this prospectus, there was approximately $11,893,352,000 aggregate principal amount at maturity of outstanding Old Notes.

Concurrently with the exchange offers, we are also soliciting consents from each holder of the Old Notes, on behalf of Anadarko, Anadarko HoldCo, Anadarko Finance and Kerr-McGee, respectively, and upon the terms and conditions set forth in this prospectus and the related letter of transmittal and consent, to certain proposed amendments (the “proposed amendments”) to each series of Old Notes to be governed by, as applicable:

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The Kerr-McGee 1982 Old Notes Indenture, Anadarko 1995 Old Notes Indenture, Anadarko HoldCo 1996 Old Notes Indenture, Anadarko 1997 Old Notes Indenture, Anadarko HoldCo 1999 Old Notes Indenture, Anadarko Finance 2001 Old Notes Indenture, Kerr-McGee 2001 Old Notes Indenture and Anadarko 2006 Old Notes Indenture are referred to collectively as the “Old Notes Indentures.” The 1982 Trustee, the 1995 Trustee, the 1996 Trustee, the 1997 Trustee, the 1999 Trustee, the 2001 Anadarko Finance Trustee, the 2001 Kerr-McGee Trustee and the 2006 Trustee are referred to collectively as the “Old Notes Trustees.”

You may not consent to the proposed amendments to the relevant Old Notes Indenture without tendering your Old Notes in the applicable exchange offer and you may not tender your Old Notes for exchange without consenting to the applicable proposed amendments. By tendering your Old Notes for exchange, you will be deemed to have validly delivered your consent to the proposed amendments to the applicable Old Notes Indenture under which those notes were issued with respect to that specific series, as further described under “The Proposed Amendments.” You may revoke your consent to the proposed amendments at any time prior to the Consent Revocation Deadline by withdrawing the Old Notes you have tendered prior to the Consent Revocation Deadline but you will not be able to revoke your consent after the Consent Revocation Deadline, as further described in this prospectus.

The consummation of each exchange offer is subject to, and conditional upon, the satisfaction or, where permitted, the waiver, where permitted, of the conditions discussed under “The Exchange Offers and Consent Solicitations—Conditions to the Exchange Offers and Consent Solicitations,” including, among other things, the completion of the merger, the satisfaction of the Requisite Consent Condition (as defined in “The Exchange Offers and Consent Solicitations—Conditions to the Exchange Offers and Consent Solicitations”) and the registration statement on Form S-4 of which this prospectus forms a part having been declared effective and remaining effective on the Settlement Date. We may, at our option, waive any such conditions at or by the Expiration Date, except (i) the condition that the registration statement of which this prospectus forms a part has been declared effective by the SEC and remains effective on the Settlement Date and (ii) the condition that the merger has been completed or will be completed by the Settlement Date.

Subject to applicable law, each exchange offer and each consent solicitation is being made independently of the other exchange offers and consent solicitations, and we reserve the right to terminate, withdraw or amend each exchange offer and each consent solicitation independently of the other exchange offers and consent solicitations at any time and from time to time, as described in this prospectus.

On May 9, 2019, we entered into an Agreement and Plan of Merger (the “merger agreement”), by and among us, Anadarko and Baseball Merger Sub 1, Inc., one of our indirect wholly-owned subsidiaries (“Merger Subsidiary”), pursuant to which, among other things and subject to the satisfaction or, where permitted, the waiver of certain conditions, Merger Subsidiary will merge with and into Anadarko, with Anadarko continuing as the surviving company and as our indirect wholly-owned subsidiary (the “merger”).

The merger is subject to customary closing conditions, including approval from Anadarko’s stockholders. Anadarko has scheduled a special meeting of its stockholders on August 8, 2019, to vote on the proposal necessary to approve the merger, and we currently expect the merger to be completed shortly thereafter. It is possible, however, that factors outside of our control could require us to complete the merger at a later time or not to complete it at all. See “Summary—The Merger” beginning on page 2 for more information.

We plan to issue the Oxy Notes promptly following the Expiration Date (the “Settlement Date”). The Old Notes are not, and the Oxy Notes will not be, listed on any securities exchange.

This investment involves risks. Prior to participating in any of the exchange offers and consenting to the proposed amendments, please see the section entitled “Risk Factors” beginning on page 27 of this prospectus for a discussion of the risks that you should consider. You also should read and carefully consider the risk factors contained in the documents that are incorporated by reference herein.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

None of Occidental, Anadarko, Anadarko HoldCo, Andarko Finance, Kerr-McGee, the exchange agent (as defined herein), the information agent, the Old Notes Trustees, the Trustee (as defined below) or the dealer managers makes any recommendation as to whether holders of the Old Notes should exchange their notes in the exchange offers or deliver consents to the proposed amendments to the Old Notes Indentures.

In order to participate in any exchange offer and consent solicitation for Old Notes, holders of the Old Notes resident in Canada are required to complete, sign and submit to the exchange agent a Canadian Eligibility Form (attached as Annex A to the accompanying letter of transmittal and consent). See “Notices to Certain Non-U.S. Holders—Canada.”

The communication of this prospectus and any other document or materials relating to the issue of the Oxy Notes offered hereby is not being made, and such documents and/or materials have not been approved, by an authorized person for the purposes of Section 21 of the United Kingdom’s Financial Services and Markets Act 2000 (as amended, the “FSMA”). Accordingly, such documents and materials are not being distributed to, and must not be directed at, the general public in the United Kingdom. The communication of such documents and/or materials is only being made to those persons in the United Kingdom who have professional experience in matters relating to investments and who fall within the definition of investment professionals (as defined in Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the “Order”)), or who fall within Article 49(2)(a) to (d) of the Order (all such persons together being referred to as “Relevant Persons”). In the United Kingdom, this prospectus and the Oxy Notes offered hereby are only available to, and any investment or investment activity to which this prospectus and any other document or materials relating to the issue of the Oxy Notes offered hereby relates, will be engaged in only with, Relevant Persons. Any person in the United Kingdom that is not a Relevant Person should not act or rely on this prospectus or any of its contents.

This prospectus and any other document or materials relating to the issue of the Oxy Notes offered hereby is not a prospectus for the purposes of the Prospectus Directive. The expression “Prospectus Directive” means Directive 2003/71/EC (as amended or superseded), and includes any relevant implementing measure in any member state (“Member State”) of the European Economic Area (the “EEA”) which has implemented the Prospectus Directive.

As a result of the merger, Anadarko will no longer be a publicly held company. Following the merger, Anadarko will file a Form 15 and the common stock will be delisted from the New York Stock Exchange and will be deregistered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Accordingly, Anadarko will not file periodic reports or information with the U.S. Securities and Exchange Commission (the “SEC”) or, if the Requisite Consents (as defined below) for the 7.500% Senior Notes due 2031 are received, with any Old Notes Trustee (as defined below) or any holders of the Old Notes. Consequently, the liquidity, market value and price volatility of the Old Notes issued by Anadarko that remain outstanding after the completion of the exchange offers may be materially and adversely affected.

PROHIBITION OF SALES TO EEA RETAIL INVESTORS —The Oxy Notes are not intended to be offered, sold or otherwise made available to any retail investor in the EEA. For these purposes, a retail investor means a person who is one (or more) of the following: (i) a retail client as defined in point (11) of Article 4(1) of Directive (EU) 2014/65/EU (as amended, “MiFID II”), (ii) a customer within the meaning of Directive (EU) 2016/97 (as amended, the “Insurance Distribution Directive”), where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II or (iii) a person that is not a qualified investor as defined in the Prospectus Directive. Consequently, no key information document required by Regulation (EU) No. 1286/2014 (as amended, the “PRIIPs Regulation”) for offering or selling the Oxy Notes and otherwise making them available to retail investors in the EEA has been prepared and therefore offering or selling the securities or otherwise making them available to a retail investor in the EEA may be unlawful under the PRIIPs Regulation.

MiFID II PRODUCT GOVERNANCE/TARGET MARKET —Solely for the purposes of each manufacturer’s product approval process, the target market assessment in respect of the Oxy Notes has led to the conclusion that: (i) the target market for the Oxy Notes is eligible counterparties and professional clients only, each as defined in MiFID II and (ii) all channels for distribution of the Oxy Notes to eligible counterparties and professional clients are appropriate. Any person subsequently offering, selling or recommending the Oxy Notes (a “distributor”) should take into consideration the manufacturers’ target market assessment; however, a distributor subject to MiFID II is responsible for undertaking its own target market assessment in respect of the Oxy Notes (by either adopting or refining the manufacturers’ target market assessment) and determining appropriate distribution channels.

The forward-looking statements included or incorporated by reference herein reflect Occidental’s and Anadarko’s current views with respect to future events and are based on numerous assumptions and assessments made by Occidental and Anadarko in light of their experience and perception of historical trends, current conditions, business strategies, operating environments, future developments and other factors they believe appropriate. By their nature, forward-looking statements involve known and unknown risks and uncertainties because they relate to events and depend on circumstances that will occur in the future. The factors described in the context of such forward-looking statements in this document could cause Occidental’s and Anadarko’s plans with respect to the merger, actual results, performance or achievements, industry results and developments to differ materially from those expressed in or implied by such forward-looking statements. Although it is believed that the expectations reflected in such forward-looking statements are reasonable, we cannot assure you that such expectations will prove to have been correct and you are therefore cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this prospectus or, in the case of a document incorporated by reference, as of the date of that document. Neither Occidental nor Anadarko assumes any obligation to update the information contained in this document (whether as a result of new information, future events or otherwise), except as required by applicable law.

SUMMARY

This summary provides an overview of selected information. Because this is only a summary, it may not contain all of the information that may be important to you in understanding the exchange offers and consent solicitations. You should carefully read this entire prospectus, including the section entitled “Risk Factors,” as well as the information incorporated by reference in this prospectus. See the section of this prospectus entitled “Where You Can Find More Information.” Unless stated otherwise, all references in this prospectus to Occidental are to Occidental Petroleum Corporation and all references to Anadarko are to Anadarko Petroleum Corporation.

Occidental

Occidental is an international oil and gas exploration and production company with operations in the United States, Middle East and Latin America. Headquartered in Houston, Occidental is one of the largest U.S. oil and gas companies, based on equity market capitalization. Occidental’s principal businesses consist of three segments as follows:

Oil and Gas —This segment explores for, develops and produces oil and condensate, NGLs and natural gas. Occidental’s oil and gas assets are located in some of the world’s highest-margin basins and are characterized by an advantaged mix of short- and long-cycle, high-return development opportunities. In the United States, Occidental holds a leading position in the Permian Basin. Other core operations are in the Middle East (Oman, United Arab Emirates and Qatar) and Latin America (Colombia).

Chemical (OxyChem) —This segment primarily manufactures and markets basic chemicals and vinyls. OxyChem is a leading North American manufacturer of PVC resins, chlorine and caustic soda – key building blocks of products such as pharmaceuticals, water treatment chemicals and durable, long-life plastics. OxyChem has manufacturing facilities in the United States, Canada and Latin America.

Midstream and Marketing —This segment purchases, markets, gathers, processes, transports and stores oil, condensate, NGL, natural gas, carbon dioxide and power. It also trades around its assets, including transportation and storage capacity, and invests in entities that conduct similar activities. Also within the midstream and marketing segment is Oxy Low Carbon Ventures (“OLCV”). OLCV seeks to capitalize on Occidental’s enhanced oil recovery leadership by developing carbon capture, utilization and storage projects that source anthropogenic carbon dioxide and promote innovative technologies that drive cost efficiencies and grow Occidental’s business while reducing emissions.

Occidental is incorporated in Delaware. Its principal executive offices are located at 5 Greenway Plaza, Suite 110, Houston, Texas 77046 and its telephone number is (713) 215-7000. Occidental’s website address is www.oxy.com . Information contained on Occidental’s website does not constitute part of this prospectus. Occidental’s common stock is publicly traded on the NYSE, under the ticker symbol “OXY.” Additional information about Occidental is included in documents incorporated by reference in this prospectus. See “Where You Can Find More Information” beginning on page iv .

Anadarko

Anadarko is among the world’s largest independent exploration and production companies, with approximately 1.5 billion barrels of oil equivalent (“BOE”) of proved reserves at December 31, 2018. Anadarko’s asset portfolio combines cash-generating conventional oil developments in the Gulf of Mexico, Algeria and Ghana with a large inventory of significant and proven high-growth unconventional resources in the U.S. onshore. Anadarko’s U.S. onshore assets include the Delaware and Denver-Julesburg basins and an emerging play in the Powder River basin. Anadarko’s asset portfolio also includes a world-class natural-gas discovery in Mozambique as well as other worldwide exploration and development opportunities.

Anadarko has two reporting segments as follows:

Exploration and Production —This segment is engaged in the exploration, development, production and sale of oil, natural gas and NGLs.

WES Midstream —This segment engages in gathering, processing, treating, and transporting Anadarko and third-party oil, natural gas and NGL production, as well as gathering and disposal of produced water. The WES Midstream segment consists of assets owned by Western Midstream Partners, LP.

Anadarko is incorporated in Delaware. Anadarko’s corporate headquarters is located at 1201 Lake Robbins Drive, The Woodlands, Texas 77380-1046, and its telephone number is (832) 636-1000. Anadarko’s website address is www.anadarko.com . Information contained on Anadarko’s website does not constitute part of this prospectus. Anadarko’s common stock is publicly traded on the NYSE, under the ticker symbol “APC.” Additional information about Anadarko is included in documents incorporated by reference in this prospectus. See “Where You Can Find More Information” beginning on page iv .

The Merger

On May 9, 2019, Occidental, Merger Subsidiary and Anadarko entered into the merger agreement, which provides that, upon the terms and subject to the conditions set forth therein, and in accordance with the Delaware General Corporation Law, Merger Subsidiary will merge with and into Anadarko, with Anadarko continuing as the surviving corporation and an indirect wholly-owned subsidiary of Occidental.

The completion of the merger remains subject to various conditions, including the approval of the merger agreement by Anadarko stockholders, the approval of the listing on the NYSE of the Occidental common stock to be issued in the merger and the absence of an injunction prohibiting the merger.

Anadarko has scheduled a special meeting of its stockholders on August 8, 2019, to vote on the proposal necessary to approve the merger, and we currently expect the merger to be completed shortly thereafter. It is possible, however, that factors outside of our control could require us to complete the merger at a later time or not to complete it at all.

Each exchange offer and consent solicitation is conditioned upon the completion of the merger prior to the Settlement Date, which condition may not be waived by Occidental. Accordingly, holders participating in the exchange offers and consent solicitations may have to wait longer than expected to receive the Oxy Notes and cash consideration and participating holders will not be able to effect transfers of their Old Notes tendered unless they are first validly withdrawn. The merger is not conditioned on the completion of any of the exchange offers, the consent solicitations or the financing transactions (as defined below).

On April 30, 2019, Occidental and Berkshire Hathaway Inc. (“Berkshire Hathaway”) entered into a securities purchase agreement, pursuant to which Berkshire Hathaway agreed to purchase newly issued Occidental preferred stock (the “series A preferred stock”) and a warrant to purchase Occidental common stock for an aggregate purchase price of $10 billion in cash (the “Berkshire Hathaway investment”), the proceeds of which will be used to partially finance the merger and pay related fees and expenses.

On June 3, 2019, Occidental entered into an $8.8 billion term loan credit agreement (the “term loan agreement”) with Citibank, N.A., as administrative agent, and certain financial institutions party thereto, as lenders (the “term loan lenders”), pursuant to which, subject to the terms and conditions set forth therein, the term loan lenders committed to provide (i) a 364-day senior unsecured term loan facility in an aggregate principal amount of up to $4.4 billion and (ii) a two-year senior unsecured term loan facility in an aggregate principal amount of up to $4.4 billion, the proceeds of which will be used to partially finance the merger and pay related fees and expenses.

Also on June 3, 2019, Occidental entered into an amendment to its existing $3.0 billion revolving credit facility pursuant to which, among other things, the commitments under the revolving credit facility will be increased by an additional $2.0 billion, to $5.0 billion (the “Revolver Upsize”), contingent upon the completion of the merger.

Also in connection with the merger agreement, Occidental has obtained commitments from affiliates of the dealer managers and other financial institutions to provide a 364-day senior unsecured bridge loan facility (the “bridge facility”) in an aggregate principal amount of up to $13.0 billion. Such commitments will be reduced to the extent that Occidental obtains certain other debt financing or debt financing commitments, completes certain issuances of equity, equity-linked or hybrid debt-equity securities, including the new notes issuance, or completes certain asset sales (subject to customary reinvestment rights), including asset sales pursuant to the Total transaction (as described below).

In addition to the exchange offers and the consent solicitations, we anticipate issuing senior unsecured capital markets indebtedness in an offering yielding gross proceeds intended to be used to finance the merger (the “new notes issuance”). The new notes issuance is not subject to any conditions except those described in the prospectus supplement pertaining to such issuance. If and to the extent we do not issue a sufficient amount of

notes pursuant to the new notes issuance or obtain other debt or equity financing at or prior to the closing date of the merger, we expect to borrow under the bridge facility to partially finance the merger.

In addition, on May 3, 2019, Occidental and TOTAL S.A. (“Total”) entered into a binding memorandum of understanding, pursuant to which Occidental has agreed to sell to Total all of the assets, liabilities, businesses and operations of Anadarko in Algeria, Ghana, Mozambique and South Africa for $8.8 billion in cash, on a cash-free, debt-free basis (the “Total transaction”). Occidental anticipates using the proceeds from the Total transaction, net of a $0.8 billion anticipated transfer tax liability, together with cash from other sources, to repay in full any indebtedness incurred under the term loan agreement (the “Term loan refinancing”).

Each of the Berkshire Hathaway investment, the Total transaction, the borrowing of loans under the term loan agreement and the Revolver Upsize (collectively, with the new notes issuance and the Term loan refinancing, the “financing transactions”) is subject to certain conditions, including, in each case, the completion of the merger (or, in the case of the new notes issuance, a special mandatory redemption provision). None of the financing transactions is contingent on the completion of the exchange offers or the consent solicitations, and none of the exchange offers or consent solicitations is conditioned on the completion of any financing transaction.

Questions and Answers about the Exchange Offers and Consent Solicitations

Specifically, (a) in exchange for each $1,000 principal amount of Old Notes that is validly tendered prior to 5:00 p.m., New York City time, on the Early Participation Date, and not validly withdrawn, holders will receive the Total Consideration, which consists of $1,000 principal amount of Oxy Notes (including the Early Participation Premium, which consists of $30 principal amount of Oxy Notes) and a cash amount of $1.00, and (b) in exchange for each $1,000 principal amount of Old Notes that is validly tendered after the Early Participation Date but prior to the Expiration Date, and not validly withdrawn, holders will receive only the Exchange Consideration, which consists of $970 principal amount of Oxy Notes and a cash amount of $1.00. For the avoidance of doubt, the $1.00 cash amount for the series of Old Zero Coupon Notes will be paid based on the aggregate principal amount (or accreted value) as of the Settlement Date of such Old Zero Coupon Notes validly tendered.

The Oxy Notes will be issued under and governed by the terms of an indenture (the “Indenture”), to be dated no later than the Settlement Date, with The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”), as described under “Description of the Oxy Notes.”

The Oxy Notes will be issued only in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof, except for the following Oxy Notes (collectively, the “Oxy $1,000 Denomination Notes”), which will only be issued in minimum denominations of $1,000 and integral multiples of $1,000 in excess thereof:

See “Description of the Oxy Notes—General.” We will not accept tenders of Old Notes if such tender would result in the holder thereof receiving in the applicable exchange offer an amount of Oxy Notes below the

applicable minimum denomination. We will not accept tenders of Old Notes if such tender would result in the holder thereof receiving in the applicable exchange offer an amount of Oxy Notes below the applicable minimum denomination. If we would be required to issue an Oxy Note in a denomination other than $2,000 or an integral multiple of $1,000 in excess thereof, or, in the case of the Oxy $1,000 Denomination Notes, in a denomination other than $1,000 or an integral multiple of $1,000 in excess thereof, we will, in lieu of such issuance, issue to such holder an Oxy Note in a principal amount (or, in the case of the Zero Coupon Notes, in a principal amount at maturity) that has been rounded down to the nearest lesser whole multiple of $1,000 above such minimum denomination and pay a cash amount equal to:

In order to participate in any exchange offer and consent solicitation for Old Notes, holders of the Old Notes resident in Canada are required to complete, sign and submit to the exchange agent a Canadian Eligibility Form (attached as Annex A to the accompanying letter of transmittal and consent). See “Notices to Certain Non-U.S. Holders—Canada.”

Any holder of the Old Notes located or resident in any Member State of the EEA which is a retail investor will not be able to participate in the exchange offers. For these purposes, a retail investor means a person who is one or more of the following: (i) a retail client as defined in point (11) of Article 4(1) of MiFID II, (ii) a customer within the meaning of the Insurance Distribution Directive, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II or (iii) a person that is not a qualified investor as defined in the Prospectus Directive.

Except as otherwise set forth above, instead of receiving a payment for accrued interest on the Old Notes that you exchange, the Oxy Notes you receive in exchange for those Old Notes will accrue interest from (and including) the most recent interest payment date on those Old Notes. Except as otherwise set forth above, no accrued but unpaid interest will be paid with respect to Old Notes tendered for exchange.

You may not consent to the proposed amendments to the relevant Old Notes Indenture without tendering your Old Notes in the applicable exchange offer and you may not tender your Old Notes for exchange without consenting to the applicable proposed amendments. By tendering your Old Notes for exchange, you will be deemed to have validly delivered your consent to the proposed amendments to the applicable Old Notes Indenture under which those notes were issued with respect to that specific series, as further described under “The Proposed Amendments.” You may revoke your consent to the proposed amendments at any time prior to the Consent Revocation Deadline by withdrawing the Old Notes you have tendered prior to the Consent Revocation Deadline but you will not be able to revoke your consent after the Consent Revocation Deadline, as further described in this prospectus.

If the Requisite Consent Condition has been satisfied on or prior to the Expiration Date, assuming all other conditions of the exchange offers and consent solicitations are satisfied or waived, as applicable, each of the sections or provisions listed below under the Old Notes Indentures will be deleted in its entirety unless otherwise indicated:

Conforming changes, etc.: The proposed amendments would also amend the Old Notes Indentures, the Old Notes and any exhibits thereto, to make certain conforming or other changes to the Old Notes Indentures, the Old Notes and any exhibits thereto, including modification or deletion of certain definitions and cross-references.

The Requisite Consents for a given series of Old Notes must be received in order for the applicable terms of such notes and the Old Notes Indenture to be amended. If the Requisite Consent Condition is not satisfied, the proposed amendments may become effective with respect to a given series of Old Notes for which the Requisite Consents are received and the Requisite Consent Condition has been waived.

The deletion or modification of the restrictive covenants contemplated by the proposed amendments would, among other things, permit Anadarko, Anadarko HoldCo, Anadarko Finance and Kerr-McGee and their respective subsidiaries to take actions that could be adverse to the interests of the holders of the outstanding Old Notes. See “Description of the Differences between the Oxy Notes and the Old Notes,” “The Exchange Offers and Consent Solicitations,” “The Proposed Amendments” and “Description of the Oxy Notes.”

Upon or promptly following the later of the Consent Revocation Deadline and the receipt and acceptance of the Requisite Consents, it is anticipated that Anadarko, Anadarko HoldCo, Anadarko Finance and Kerr-McGee, respectively, and the applicable Old Notes Trustee, will execute a supplemental indenture with respect to each affected series of Old Notes that will, subject to the satisfaction or, where permitted, the waiver of the conditions to the relevant exchange offer, effectuate the proposed amendments to the applicable Old Notes Indenture with effect from the Settlement Date.

as amended by the proposed amendments. If the proposed amendments become effective, the Old Notes Indentures will have fewer restrictive terms and afford reduced protections to the holders of those securities compared to those currently in the Old Notes Indentures or those applicable to the Oxy Notes.

Additionally, the trading market for any remaining Old Notes may be more limited than it is at present, and the smaller outstanding principal amount may make the trading market of any remaining Old Notes more volatile.

As a consequence of any or all of the foregoing, the liquidity, market value and price of Old Notes that remain outstanding may be materially and adversely affected. Therefore, if your Old Notes are not tendered and accepted in the applicable exchange offer, it may become more difficult for you to sell or transfer your unexchanged Old Notes.

See “Risk Factors—Risks Relating to the Exchange Offers and Consent Solicitations—If the proposed amendments become effective, the Old Notes Indentures will have fewer restrictive terms and afford reduced protections to the holders of those securities compared to those currently in the Old Notes Indentures or those applicable to the Oxy Notes.”

The Oxy Notes offered will be structurally subordinated to all existing and future obligations of any of our subsidiaries and any subsidiaries that we may in the future acquire or establish. As of June 30, 2019, after giving effect to the Transactions and assuming 100% participation in the exchange offers, our consolidated subsidiaries (including Anadarko and its subsidiaries) would have total liabilities, including trade payables (but excluding intercompany liabilities) of approximately $          billion. See “Risk Factors—Risks Relating to the Oxy Notes—Occidental will incur a substantial amount of indebtedness and other payment obligations in connection with the exchange offers and the other financing transactions.”

If the Requisite Consent Condition is not satisfied but is waived, the proposed amendments may become effective with respect to a given series of Old Notes for which the Requisite Consents are received.

to the proposed amendments to the Old Notes Indentures with respect to that specific series, as further described under “The Proposed Amendments.” You may not tender your Old Notes for exchange without consenting to the applicable proposed amendments.

Following the Expiration Date, tenders of Old Notes may not be validly withdrawn unless Occidental is otherwise required by law to permit withdrawal. In the event of termination of an exchange offer, the Old Notes tendered pursuant to such exchange offer will be promptly returned to the tendering holders. See “The Exchange Offers and Consent Solicitations—Withdrawal of Tenders and Revocation of Corresponding Consents.”

Beneficial owners should be aware that their broker, dealer, commercial bank, trust company or other nominee may establish its own earlier deadlines for participation in the exchange offers and consent solicitations. Accordingly, beneficial owners wishing to participate in the exchange offers and consent solicitations should contact their broker, dealer, commercial bank, trust company or other nominee as soon as possible in order to determine the times by which such owner must take action in order to participate in the exchange offers and consent solicitations.

If any Old Notes are subsequently issued in certificated form and are held of record by a custodian bank, depositary, broker, trust company or other nominee and you wish to tender the securities in the exchange offers, you should contact that institution promptly and instruct the institution to tender on your behalf. The record holder will tender your notes on your behalf, but only if you instruct the record holder to do so. See “The Exchange Offers and Consent Solicitations—Procedures for Consent and Tendering Old Notes—Old Notes Held Through a Nominee by a Beneficial Owner.”

Questions concerning tender procedures for the Old Notes and requests for additional copies of this prospectus should be directed to the following information agent:

Global Bondholder Services Corporation
65 Broadway, Suite 404
New York, New York 10006
Attention: Corporate Actions
Bank and Brokers Call Collect: (212) 430-3774
All Others, Please Call Toll-Free: (866) 470-3900
contact@gbsc-usa.com

Amendments and Supplements

We may be required to amend or supplement this prospectus at any time to add, update or change the information contained herein. You should read this prospectus and any prospectus supplement, together with the documents incorporated by reference herein and therein, the registration statement, the exhibits thereto and the additional information described under the heading “Where You Can Find More Information.”

No Appraisal or Dissenter’s Rights

Holders of the Old Notes do not have any appraisal rights or dissenters’ rights under New York law, the law governing the Old Notes Indentures and the Old Notes, or under the terms of the Old Notes Indentures in connection with the exchange offers and consent solicitations. See “The Exchange Offers and Consent Solicitation—Absence of Dissenter’s Rights.”

We may be required to amend or supplement this prospectus at any time to add, update or change the information contained in this prospectus. You should read this prospectus and any amendment or supplement hereto, together with the documents incorporated by reference herein and therein and the additional information described under “Where You Can Find More Information.”

Corporate Structure

The following diagram depicts (on a condensed basis) our anticipated corporate structure after giving effect to the Transactions and assumes 100% participation in the exchange offers:

The Oxy Notes

The following summary contains basic information about the Oxy Notes. It does not contain all of the information that may be important to you. For a more complete description of the terms of the Oxy Notes, see “Description of the Oxy Notes.”

indebtedness and pay such dividends and fund our operations, we may be forced to reduce or delay capital expenditures, seek additional capital, sell assets or refinance our indebtedness and pay such dividends. Any such action may not be successful and may have a material adverse effect on our business, financial condition, results of operations and/or cash flows.

The Oxy Notes will be structurally subordinated to the indebtedness and other liabilities of our subsidiaries.

The Oxy Notes will be obligations of Occidental exclusively and not of any of our subsidiaries, including Anadarko (and its subsidiaries) after the merger, and none of our subsidiaries will guarantee the Oxy Notes. A significant portion of our operations is and, following the completion of the merger, will continue to be conducted through our subsidiaries. In addition, we derive substantially all of our revenues from our subsidiaries. As a result, our cash flow and our ability to service our debt and other obligations, including the Oxy Notes, will depend on the results of operations of our subsidiaries and upon the ability of our subsidiaries to provide us with cash to pay amounts due on our obligations, including the Oxy Notes. Our subsidiaries are separate and distinct legal entities and have no obligation to make payments on the Oxy Notes or to make funds available to us for that purpose. Consequently, the Oxy Notes will be structurally subordinated to all existing and future liabilities of any of our subsidiaries and any subsidiaries that we may in the future acquire or establish. In addition, dividends, loans or other distributions from our subsidiaries to us are dependent upon results of operations of our subsidiaries, may be subject to contractual and other restrictions, may be subject to tax or other laws limiting our ability to repatriate funds from foreign subsidiaries and may be subject to other business considerations. As of June 30, 2019, after giving effect to the Transactions and assuming 100% participation in the exchange offers, our consolidated subsidiaries (including Anadarko and its subsidiaries) would have total liabilities, including trade payables (but excluding intercompany liabilities) of approximately $          billion.

Our credit ratings may not reflect all risks of an investment in the Oxy Notes and there is no protection in the Indenture for holders of the Oxy Notes in the event of a ratings downgrade. A downgrade in our credit ratings could negatively impact our cost of and ability to access capital.

Our credit ratings are an assessment by rating agencies of our ability to pay our debts when due but they may not reflect the potential impact of all risks related to an investment in the Oxy Notes. Consequently, real or anticipated changes in our credit ratings will generally affect the market value of the Oxy Notes. Credit ratings are not a recommendation to buy, sell or hold any security, and may be revised or withdrawn at any time by the issuing organization in its sole discretion. We have no obligation to maintain the ratings and neither we nor any underwriter undertakes any obligation to advise holders of the Oxy Notes of any change in ratings. Each agency’s rating should be evaluated independently of any other agency’s rating.

We cannot assure you that our credit ratings will not be downgraded in the future. Certain credit rating agencies have placed us on their negative credit watch lists and stated that they anticipate our corporate credit rating will be downgraded in connection with completion of the merger. A downgrade in our credit ratings could negatively impact our cost of capital or our ability to effectively execute aspects of our strategy. If we were to be downgraded, it could be difficult for us to raise debt in the public debt markets and the cost of any new debt could be much higher than our outstanding debt.

The Indenture does not limit the amount of unsecured indebtedness that we or our subsidiaries may incur.

The Indenture does not limit our ability or that of our subsidiaries to incur additional unsecured indebtedness or contain provisions that would afford holders of the Oxy Notes protection in the event of a decline in our credit quality or a take-over, recapitalization or highly leveraged or similar transaction. Accordingly, we and our subsidiaries could, in the future, enter into transactions that could increase the amount of unsecured indebtedness outstanding at that time or otherwise adversely affect your position in our consolidated capital structure or our credit ratings.

If an active trading market does not develop for the Oxy Notes, you may be unable to sell your Oxy Notes or to sell your Oxy Notes at a price that you deem sufficient.

The Oxy Notes are a new issuance of securities with no established trading market, and we do not intend to list the Oxy Notes on any securities exchange or automated quotation system. An active trading market for the Oxy Notes may not develop, or if one does develop, it may not be sustained. If an active trading market fails to develop or cannot be sustained, you may not be able to resell your Oxy Notes at their fair market value or at all.

We expect the Zero Coupon Notes will be issued with original issue discount (“OID”) for U.S. federal income tax purposes.

We expect the Zero Coupon Notes will be issued with OID for U.S. federal income tax purposes. U.S. holders are generally required to include such OID in gross income on a constant yield to maturity basis in advance of the receipt of cash payment thereof for U.S. federal income tax purposes, regardless of such holders’ ordinary method of accounting. Although not expected, other Oxy Notes may be issued with OID if the stated principal amount of any such Oxy Notes exceeds their issue price (as determined for U.S. federal income tax purposes) by more than a de minimis amount. See “Material U.S. Federal Income Tax Considerations––Tax Consequences to Exchanging U.S. Holders––Ownership of the Oxy Notes—Generally––Original Issue Discount.”

Risks Relating to the Exchange Offers and Consent Solicitations

Our board of directors has not made a recommendation as to whether you should tender your Old Notes in exchange for Oxy Notes in the exchange offers, and we have not obtained a third-party determination that the exchange offers are fair to holders of our Old Notes.

Our board of directors has not made, and will not make, any recommendation as to whether holders of the Old Notes should tender their Old Notes in exchange for Oxy Notes pursuant to the exchange offers. We have not retained, and do not intend to retain, any unaffiliated representative to act solely on behalf of the holders of the Old Notes for purposes of negotiating the terms of these exchange offers, or preparing a report or making any recommendation concerning the fairness of these exchange offers. Therefore, if you tender your Old Notes, you may not receive more than or as much value as if you chose to keep them. Holders of the Old Notes must make their own independent decisions regarding their participation in the exchange offers.

Upon consummation of the exchange offers, holders who exchange Old Notes will lose their rights under such Old Notes.

If you tender Old Notes and your Old Notes are accepted for exchange pursuant to the exchange offers, you will lose all of your rights as a holder of the exchanged Old Notes, including, without limitation, your right to future interest and principal payments with respect to the exchanged Old Notes. In addition, the Old Notes are issued by entities that, upon completion of the merger, will be subsidiaries of ours and, as such, any Old Notes that remain outstanding will be structurally senior to the Oxy Notes.

If the proposed amendments become effective, the Old Notes Indentures will have fewer restrictive terms and afford reduced protections to the holders of those securities compared to those currently in the Old Notes Indentures or those applicable to the Oxy Notes.

The proposed amendments to the Old Notes Indentures would, among other things:

If the proposed amendments to the Old Notes Indentures become effective, each non-exchanging holder of the Old Notes will be bound by the proposed amendments even if that holder did not consent to the proposed amendments. These amendments will permit us to take certain previously prohibited actions that could increase the credit risk with respect to Anadarko, Anadarko HoldCo, Anadarko Finance and Kerr-McGee and their respective subsidiaries, and might adversely affect the liquidity, market price and price volatility of the Old Notes or otherwise be adverse to the interests of the holders of the Old Notes. See “The Proposed Amendments.”

The liquidity of any trading market that currently exists for the Old Notes may be adversely affected by the exchange offers, and holders of the Old Notes who do not participate in the exchange offers may find it more difficult to sell their Old Notes after the exchange offers are completed.

To the extent that Old Notes are tendered and accepted for exchange pursuant to the exchange offers, the trading markets for the remaining Old Notes will become more limited or may cease to exist altogether. A debt security with a small outstanding aggregate principal amount or “float” may command a lower price than would a comparable debt security with a larger float. Therefore, the market price for the unexchanged Old Notes may be adversely affected. In addition, if the proposed amendments to the Old Notes Indentures become effective, it could have a further negative effect on the trading markets or market price of the unexchanged Old Notes.

Certain credit ratings for the Old Notes may be withdrawn.

Certain credit ratings on the unexchanged Old Notes may be withdrawn as a result of the exchange offers, which could materially adversely affect the market price for each series of unexchanged Old Notes.

The exchange offers and consent solicitations may be canceled or delayed.

The consummation of each exchange offer and consent solicitation is subject to, and conditional upon, the satisfaction or, where permitted, the waiver of the conditions discussed under “The Exchange Offers and Consent Solicitations—Conditions to the Exchange Offers and Consent Solicitations,” including, among other things, the completion of the merger, the satisfaction of the Requisite Consent Condition and the registration statement on Form S-4 of which this prospectus forms a part having been declared effective and remaining effective on the Settlement Date. We may, at our option, waive any such conditions at or by the Expiration Date, except (i) the condition that the registration statement of which this prospectus forms a part has been declared effective by the SEC and remains effective on the Settlement Date and (ii) the condition that the merger has been completed or will be completed by the Settlement Date. Anadarko has scheduled a special meeting of its stockholders on August 8, 2019, to vote on the proposal necessary to approve the merger, and we currently expect the merger to be completed shortly thereafter. It is possible, however, that factors outside of our control could require us to complete the merger at a later time or not to complete it at all. Even if the exchange offers and consent solicitations are completed, the exchange offers and consent solicitations may not be completed on the schedule described in this prospectus. Accordingly, holders participating in the exchange offers and consent solicitations may have to wait longer than expected to receive their Oxy Notes and the cash consideration and participating holders of the Old Notes will not be able to effect transfers of their Old Notes tendered for exchange unless they are first validly withdrawn.

You may not receive Oxy Notes in the exchange offers and consent solicitations if the applicable procedures for the exchange offers and consent solicitations are not followed.

We will issue the Oxy Notes and cash in exchange for your Old Notes only if you tender your Old Notes and deliver properly completed documentation for the applicable exchange offer. You must deliver a properly completed and duly executed letter of transmittal and consent or the electronic transmittal through DTC’s ATOP

and other required documents before expiration of the exchange offers and consent solicitations. See “The Exchange Offers and Consent Solicitations—Procedures for Consent and Tendering Old Notes” for a description of the procedures to be followed to tender your Old Notes.

You should allow sufficient time to ensure delivery of the necessary documents. None of Occidental, the exchange agent, the information agent or the dealer managers is under any duty to give notification of defects or irregularities with respect to the tenders of the Old Notes for exchange or the related consents.

You may not revoke your consent to the proposed amendments after the Consent Revocation Deadline.

Consents to the proposed amendments may be revoked at any time prior to the Consent Revocation Deadline, but may not be revoked at any time thereafter. Consents may be revoked only by validly withdrawing the associated tendered Old Notes. A valid withdrawal of tendered Old Notes prior to the Consent Revocation Deadline will be deemed to be a concurrent revocation of the related consent to the proposed amendments to the applicable Old Notes Indenture, and a revocation of a consent to the proposed amendments prior to the Consent Revocation Deadline will be deemed to be a concurrent withdrawal of the related tendered Old Notes. However, a valid withdrawal of Old Notes after the Consent Revocation Deadline will not be deemed a revocation of the related consents and your consents will continue to be deemed delivered. No additional payment will be made for a holder’s consent to the proposed amendments to the Old Notes Indentures.

We may repurchase, discharge, defease or redeem any Old Notes that are not tendered in the exchange offers, and any such transaction may be on terms that are more favorable to the holders of the Old Notes than the terms of the exchange offers.

We or any of our affiliates may, to the extent permitted by applicable law and the applicable Old Notes Indenture, after the Settlement Date, acquire, discharge, defease or redeem the Old Notes that are not tendered and accepted in the exchange offers, whether through open market purchases, privately negotiated transactions, tender offers, exchange offers, redemption, discharge, defeasance or otherwise, upon such terms and at such prices as we may determine or as may be provided for in the applicable Old Notes Indenture, as the case may be. The terms of any such transaction may be more or less favorable to holders than the terms of the applicable exchange offer. We cannot assure you whether we or our affiliates will choose to pursue any of these alternatives.

Holders will recognize gain or loss for U.S. federal income tax purposes on the exchange of Old Notes for Oxy Notes.

We believe that the exchange of the Old Notes for the Oxy Notes pursuant to the exchange offers will be treated as a taxable disposition of the Old Notes in exchange for the Oxy Notes for U.S. federal income tax purposes. Accordingly, U.S. Holders that tender the Old Notes in exchange for the Oxy Notes will generally recognize gain or loss for U.S. federal income tax purposes. See “Material U.S. Federal Income Tax Considerations—Tax Consequences to Exchanging U.S. Holders—The Exchange Offers” and “Material U.S. Federal Income Tax Considerations—Tax Consequences to Exchanging Non-U.S. Holders—The Exchange Offers.”

of $1,000 and integral multiples of $1,000 in excess thereof. See “Description of the Oxy Notes—General.” We will not accept tenders of Old Notes if such tender would result in the holder thereof receiving in the applicable exchange offer an amount of Oxy Notes below the applicable minimum denomination. If we would be required to issue an Oxy Note in a denomination other than $2,000 or a whole multiple of $1,000 in excess thereof (or, in the case of the Oxy $1,000 Denomination Notes, in a denomination other than $1,000 or a whole multiple of $1,000 in excess thereof), we will, in lieu of such issuance, issue to such holder an Oxy Note in a principal amount (or, in the case of the Zero Coupon Notes, in a principal amount at maturity) that has been rounded down to the nearest lesser whole multiple of $1,000 above such minimum denomination and pay a cash amount equal to:

In order to participate in any exchange offer and consent solicitation for Old Notes, holders of the Old Notes resident in Canada are required to complete, sign and submit to the exchange agent a Canadian Eligibility Form (attached as Annex A to the accompanying letter of transmittal and consent). See “Notices to Certain Non-U.S. Holders—Canada.”

Any holder of the Old Notes located or resident in any Member State of the EEA which is a retail investor will not be able to participate in the applicable exchange offer. For these purposes, a retail investor means a person who is one or more of the following: (i) a retail client as defined in point (11) of Article 4(1) of MiFID II, (ii) a customer within the meaning of the Insurance Distribution Directive, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II or (iii) a person that is not a qualified investor as defined in the Prospectus Directive.

The interest rate, interest payment dates, optional redemption prices and maturity of each series of Oxy Notes to be issued by Occidental in the exchange offers will be the same as those of the corresponding series of Old Notes to be exchanged (subject to, in the case of the optional redemption prices, certain technical changes to ensure that the calculations of the treasury rate are consistent with the methods used in the new notes issuance). The Oxy Notes received in exchange for the tendered Old Notes will accrue interest from (and including) the most recent date to which interest has been paid on those Old Notes; provided that interest will only accrue with respect to the aggregate principal amount of Oxy Notes you receive, which will be less than the principal amount of Old Notes you tendered for exchange in the event that your Old Notes are tendered after the Early Participation Date. Except as otherwise set forth above, you will not receive a payment for accrued and unpaid interest on Old Notes you exchange at the time of the exchange.

Each series of Oxy Notes is a new series of debt securities that will be issued under our Indenture. The terms of the Oxy Notes will include those expressly set forth in such Oxy Notes, the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”).

In conjunction with the exchange offers, we are also soliciting consents from the holders of each series of Old Notes to effect the proposed amendments to the applicable Old Notes Indenture under which each such series of Old Notes were issued and are governed. You may not consent to the proposed amendments to the relevant Old Notes Indenture without tendering your Old Notes in the applicable exchange offer and you may not tender your Old Notes for exchange without consenting to the applicable proposed amendments.

The consummation of each exchange offer is subject to, and conditional upon, the satisfaction or, where permitted, the waiver of the conditions discussed under “—Conditions to the Exchange Offers and Consent Solicitations,” including, among other things, the completion of the merger, the satisfaction of the Requisite Consent Condition and the registration statement on Form S-4 of which this prospectus forms a part having been

declared effective and remaining effective on the Settlement Date. We may, at our option, waive any such conditions at or by the Expiration Date, except (i) the condition that the registration statement of which this prospectus forms a part has been declared effective by the SEC and remains effective on the Settlement Date and (ii) the condition that the merger has been completed or will be completed by the Settlement Date. For information about other conditions to our obligations to complete the exchange offers, see “—Conditions to the Exchange Offers and Consent Solicitations.” For a description of the proposed amendments, see “The Proposed Amendments.” The Requisite Consents for a given series of Old Notes must be received in order for the applicable terms of such notes and the Old Notes Indenture to be amended. If the Requisite Consent Condition is not satisfied, the proposed amendments may become effective with respect to a given series of Old Notes for which the Requisite Consents are received and the Requisite Consent Condition has been waived.

Upon or promptly following the later of the Consent Revocation Deadline and the receipt and acceptance of the Requisite Consents, subject to the satisfaction or, where permitted, the waiver of the conditions to the relevant exchange offer, Anadarko, Anadarko HoldCo, Anadarko Finance and Kerr-McGee, as applicable, and the applicable Old Notes Trustee under the relevant Old Notes Indenture will execute a supplemental indenture setting forth the proposed amendments in respect of the Old Notes. Under the terms of the applicable supplemental indenture, the proposed amendments will become effective on the Settlement Date with respect to the affected series of Old Notes, subject to the satisfaction or, where permitted, the waiver of the conditions to the relevant exchange offer. Each non-consenting holder of a series of Old Notes will be bound by the applicable supplemental indenture. The form of each supplemental indenture is filed as an exhibit to this registration statement of which this prospectus forms a part.

Conditions to the Exchange Offers and Consent Solicitations

The consummation of each exchange offer is subject to, and conditional upon, the satisfaction or, where permitted, the waiver of the following conditions: (a) the completion of the merger at or by the Settlement Date, (b) the receipt of Requisite Consents for all series of Old Notes at or by the Expiration Date (the “Requisite Consent Condition”), (c) the receipt of Requisite Consents for the applicable series of Old Notes at or by the Expiration Date, (d) the valid tender (without valid withdrawal) of a majority in aggregate principal amount of the Old Notes of all series held by persons other than Anadarko, Anadarko HoldCo, Anadarko Finance, Kerr-McGee, or any person directly or indirectly controlling, controlled by or under direct or indirect common control with Anadarko, Anadarko HoldCo, Anadarko Finance or Kerr-McGee, at or by the Expiration Date, (e) the registration statement of which this prospectus forms a part having been declared effective by the SEC and remaining effective on the Settlement Date and (f) the following statements being true at the Expiration Date:

(1) In our reasonable judgment, no action or event has occurred or been threatened (including a default under an agreement, indenture or other instrument or obligation to which we or Anadarko or one of our respective affiliates is a party or by which we or Anadarko or one of our respective affiliates is bound), no action is pending, no action has been taken and no statute, rule, regulation, judgment, order, stay, decree or injunction has been promulgated, enacted, entered, enforced or deemed applicable to an exchange offer, the exchange of Old Notes under an exchange offer, a consent solicitation or the proposed amendments, by or before any court or governmental, regulatory or administrative agency, authority or tribunal, that either:

(2) None of the following has occurred:

(3) At or by the Expiration Date, no trustee under any Old Notes Indenture has objected in any respect to, or taken any action that could in our reasonable judgment adversely affect the consummation of, any of the exchange offers, the exchange of Old Notes under an exchange offer, any of the consent solicitations or our ability to effect the proposed amendments, nor has any such trustee taken any action that challenges the validity or effectiveness of the procedures used by us in soliciting consents (including the form thereof) or in making any of the exchange offers, the exchange of the Old Notes under an exchange offer or any of the consent solicitations.

The Requisite Consents for a given series of Old Notes must be received in order for the applicable terms of such notes and the Old Notes Indenture to be amended. If the Requisite Consent Condition is not satisfied, the proposed amendments may become effective with respect to a given series of Old Notes for which the Requisite Consents are received and the Requisite Consent Condition has been waived.

Any reasonable determination made by us concerning these events, developments or circumstances shall be conclusive and binding. We may, at our option, waive any conditions at or by the Expiration Date, except (i) the condition that the registration statement of which this prospectus forms a part has been declared effective by the SEC and remains effective on the Settlement Date and (ii) the condition that the merger has been completed or will be completed by the Settlement Date.

If any of these conditions is not satisfied with respect to any or all series of the Old Notes, we may, at any time before the consummation of the exchange offers or consent solicitations:

Expiration Date; Extensions; Amendments

The Expiration Date for the exchange offers shall be 5:00 p.m., New York City time, on          , 2019, subject to our right to extend that date and time with respect to one or more series, including in connection with any delay in the completion of the merger, in which case the Expiration Date shall be the latest date and time to which we have extended the exchange offer of the applicable series.

Subject to applicable law, we expressly reserve the right, with respect to the exchange offers and consent solicitations for each series of Old Notes to:

If we exercise any such right, we will give written notice thereof to the exchange agent and will make a public announcement thereof as promptly as practicable. Disclosure of material changes in the terms of the exchange offers and consent solicitations will be disseminated promptly in accordance with Rule 13e-4(e)(3) under the Exchange Act. Without limiting the manner in which we may choose to make a public announcement of any delay, extension, amendment or termination of any of the exchange offers or consent solicitations, we will not be obligated to publish, advertise or otherwise communicate any such public announcement, other than by making a timely press release to any appropriate news agency.

The minimum period during which the exchange offers and consent solicitations will remain open following material changes in the terms of the exchange offers and consent solicitations or in the information concerning the exchange offers and consent solicitations will depend upon the facts and circumstances of such change, including the relative materiality of the changes.

In accordance with Rule 14e-1 under the Exchange Act, if we elect to change the consideration offered or the percentage of Old Notes sought, the relevant exchange offers and consent solicitations will remain open for a minimum 10 business-day period following the date that the notice of such change is first published or sent to holders of the Old Notes. We may choose to extend any of the exchange offers, in our sole discretion, by giving notice of such extension at any time on or prior to 9:00 a.m., New York City time, on the business day immediately following the previously scheduled Expiration Date.

If the terms of the exchange offers and consent solicitations are amended in a manner determined by us to constitute a material change adversely affecting any holder of the Old Notes, we will promptly disclose any such amendment in a manner reasonably calculated to inform holders of the Old Notes of such amendment and will extend the relevant exchange offers and consent solicitations as required by applicable law.

Each exchange offer and each consent solicitation is being made independently of the other exchange offers and consent solicitations and, subject to applicable law, we reserve the right to terminate, withdraw or amend each exchange offer and each consent solicitation independently of the other exchange offers and consent solicitations at any time and from time to time, as described in this prospectus.

Effect of Tender

Any tender of an Old Note by a holder that is not validly withdrawn prior to the Expiration Date will constitute a binding agreement between that holder and Occidental and a consent to the proposed amendments, upon the terms and subject to the conditions of the relevant exchange offer and, for the Old Notes, the letter of transmittal and consent, which agreement will be governed by, and construed in accordance with, the laws of the State of New York. The acceptance of the exchange offers by a tendering holder of the Old Notes will constitute the agreement by a tendering holder to deliver good and marketable title to the tendered Old Notes, free and clear of all liens, charges, claims, encumbrances, interests and restrictions of any kind. If you validly withdraw your tendered Old Notes after the Consent Revocation Deadline, you will not be able to revoke the related consent to the proposed amendments to the Old Notes Indentures (see “—Withdrawal of Tenders and Revocation of Corresponding Consents”).

If the proposed amendments to the Old Notes Indentures have become effective, the amendments will apply to all Old Notes that are not acquired in the exchange offers, even though the holders of those Old Notes did not consent to the proposed amendments. Thereafter, all such Old Notes will be governed by the relevant Old Notes Indenture as amended by the proposed amendments to that Old Notes Indenture. If the proposed amendments become effective, the Old Notes Indentures will have fewer restrictive terms and afford reduced protections to the holders of those securities compared to those currently in the Old Notes Indentures or those applicable to the Oxy Notes. See “Risk Factors—Risks Relating to the Exchange Offers and Consent Solicitations.”

Absence of Dissenter’s Rights

Holders of the Old Notes do not have any appraisal rights or dissenter’s rights under New York law, the law governing the Old Notes Indentures and the Old Notes, or under the terms of the Old Notes Indentures in connection with the exchange offers and consent solicitations.

Acceptance of Old Notes for Exchange; Oxy Notes; Effectiveness of Proposed Amendments

Assuming the conditions to the exchange offers are satisfied or, where permitted, waived, we will issue Oxy Notes in global, book-entry form and pay the cash consideration in connection with the exchange offers on the Settlement Date (in exchange for Old Notes that are properly tendered (and not validly withdrawn) before the Expiration Date and accepted for exchange).

We will be deemed to have accepted validly tendered Old Notes (and will be deemed to have accepted validly delivered consents to the proposed amendments for the applicable Old Notes Indenture) if and when we have given oral or written notice thereof to the exchange agent. Subject to the terms and conditions of the exchange offers, delivery of Oxy Notes and payment of the cash consideration in connection with the exchange of Old Notes accepted by us will be made by the exchange agent on the Settlement Date upon receipt of such notice. The exchange agent will act as agent for participating holders of the Old Notes for the purpose of receiving consents and Old Notes from, and transmitting Oxy Notes and the cash consideration to, such holders. If any tendered Old Notes are not accepted for any reason set forth in the terms and conditions of the exchange offers or if Old Notes are withdrawn prior to the Expiration Date, such unaccepted or withdrawn Old Notes will be returned without expense to the tendering holder promptly after the expiration or termination of the exchange offers.

It is expected that the supplemental indentures for the proposed amendments to the Old Notes Indentures will be duly executed and delivered by Anadarko, Anadarko HoldCo, Anadarko Finance or Kerr-McGee, as applicable, and the applicable Old Notes Trustee upon or promptly following the later of the Consent Revocation Deadline and the receipt and acceptance of the applicable Requisite Consents and the proposed amendments contained therein will become effective from the Settlement Date, subject to the satisfaction or, where permitted, the waiver of the conditions to the relevant exchange offer.

Procedures for Consent and Tendering Old Notes

If you hold Old Notes and wish to have those notes exchanged for Oxy Notes and the cash consideration, you must validly tender (or cause the valid tender of) your Old Notes using the procedures described in this prospectus and in the accompanying letter of transmittal and consent. The proper tender of Old Notes will constitute an automatic consent to the proposed amendments to the relevant Old Notes Indenture.

The procedures by which you may tender or cause to be tendered Old Notes will depend upon the manner in which you hold the Old Notes, as described below.

Old Notes Held with DTC by a DTC Participant

Pursuant to authority granted by DTC, if you are a DTC participant that has Old Notes credited to your DTC account and thereby held of record by DTC’s nominee, you may directly tender your Old Notes and deliver a consent as if you were the record holder. Accordingly, references herein to record holders include DTC participants with Old Notes credited to their accounts. Within two business days after the date of this prospectus, the exchange agent for the Old Notes, GBSC, as the exchange agent, will establish accounts with respect to the Old Notes at DTC for purposes of the exchange offers.

The Old Notes of any series may be tendered (and corresponding consents given) only in the minimum denominations and integral multiples in excess thereof applicable to such series of Old Notes, as set forth below, except in the case of the Old Zero Coupon Notes. To facilitate participation in the exchange offer, the Old Zero Coupon Notes may be tendered in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.

Holders who tender less than all of their Old Notes must continue to hold Old Notes in at least the applicable minimum denomination and integral multiple in excess thereof, which is:

No alternative, conditional or contingent tenders will be accepted.

Any DTC participant may tender Old Notes and thereby deliver a consent to the proposed amendments to the applicable Old Notes Indenture by effecting a book-entry transfer of the Old Notes to be tendered in the exchange offers into the account of the exchange agent at DTC and either (1) electronically transmitting its acceptance of the exchange offers through DTC’s ATOP procedures for transfer or (2) completing and signing the letter of transmittal and consent according to the instructions contained therein and delivering it, together with any signature guarantees and other required documents, to the exchange agent at its address on the back cover page of this prospectus, in either case before the Expiration Date.

If ATOP procedures are followed, DTC will verify each acceptance transmitted to it, execute a book-entry delivery to the exchange agent’s account at DTC and send an agent’s message to the exchange agent. An “agent’s message” is a message, transmitted by DTC to and received by the exchange agent and forming part of a book-entry confirmation, which states that DTC has received an express acknowledgement from a DTC participant tendering Old Notes that the participant has received and agrees to be bound by the terms of the letter of transmittal and consent and that Occidental, Anadarko, Anadarko HoldCo, Anadarko Finance and Kerr-McGee may enforce the agreement against the participant. DTC participants following this procedure should allow sufficient time for completion of the ATOP procedures prior to the Expiration Date.

The letter of transmittal and consent (or facsimile thereof), with any required signature guarantees, or (in the case of book-entry transfer) an agent’s message in lieu of the letter of transmittal and consent, and any other required documents, must be transmitted to and received by the exchange agent prior to the Expiration Date at one of its addresses set forth on the back cover page of this prospectus. Delivery of these documents to DTC does not constitute delivery to the exchange agent.

Old Notes Held Through a Nominee by a Beneficial Owner

Currently, all of the Old Notes are global notes in book-entry form and can only be tendered by following the procedures described under “—Procedures for Consent and Tendering Old Notes—Old Notes Held with DTC by a DTC Participant.” However, any beneficial owner whose Old Notes are registered in the name of a broker, dealer, commercial bank, trust company or other nominee and who wishes to tender should contact the registered holder promptly and instruct it to tender on the owner’s behalf if it wishes to participate in the exchange offers. You should keep in mind that your intermediary may require you to take action with respect to the exchange offers a number of days before the Early Participation Date or the Expiration Date in order for such entity to tender Old Notes on your behalf on or prior to the Early Participation Date or the Expiration Date in accordance with the terms of the exchange offers.

Beneficial owners should be aware that their broker, dealer, commercial bank, trust company or other nominee may establish its own earlier deadlines for participation in the exchange offers and consent solicitations. Accordingly, beneficial owners wishing to participate in the exchange offers and consent solicitations should contact their broker, dealer, commercial bank, trust company or other nominee as soon as possible in order to determine the times by which such owner must take action in order to participate in the exchange offers and consent solicitations.

Letter of Transmittal and Consent

Subject to and effective upon the acceptance for exchange and issuance of Oxy Notes and the payment of the cash consideration, in exchange for Old Notes tendered in accordance with the terms and subject to the conditions set forth in this prospectus, by executing and delivering a letter of transmittal and consent (or agreeing to the terms of a letter of transmittal and consent pursuant to an agent’s message) a tendering holder of the Old Notes:

Additionally, in order to participate in any exchange offer and consent solicitation for Old Notes, holders of the Old Notes resident in Canada are required to complete, sign and submit to the exchange agent a Canadian Eligibility Form (attached as Annex A to the accompanying letter of transmittal and consent). See “Notices to Certain Non-U.S. Holders—Canada.”

Proper Execution and Delivery of Letter of Transmittal and Consent

If you wish to participate in the exchange offers and consent solicitations, delivery of your Old Notes, signature guarantees and other required documents are your responsibility. Delivery is not complete until the required items are actually received by the exchange agent. If you mail these items, we recommend that you (1) use registered mail properly insured with return receipt requested and (2) mail the required items in sufficient time to ensure timely delivery.

Except as otherwise provided below, all signatures on the letter of transmittal and consent or a notice of withdrawal must be guaranteed by a recognized participant in the Securities Transfer Agents Medallion Program, the NYSE Medallion Signature Program or the Stock Exchange Medallion Program. Signatures on the letter of transmittal and consent need not be guaranteed if:

Withdrawal of Tenders and Revocation of Corresponding Consents

Tenders of Old Notes in connection with any of the exchange offers may be withdrawn at any time prior to the Expiration Date of the applicable exchange offer. Following the Expiration Date, tenders of Old Notes may not be validly withdrawn unless Occidental is otherwise required by law to permit withdrawal. Consents to the proposed amendments may be revoked at any time prior to the Consent Revocation Deadline, but may not be revoked at any time thereafter. Consents may be revoked only by validly withdrawing the associated tendered Old Notes. A valid withdrawal of tendered Old Notes prior to the Consent Revocation Deadline will be deemed to be a concurrent revocation of the related consent to the proposed amendments to the applicable Old Notes Indenture, and a revocation of a consent to the proposed amendments prior to the Consent Revocation Deadline will be deemed to be a concurrent withdrawal of the related tendered Old Notes. However, a valid withdrawal of Old Notes after the Consent Revocation Deadline will not be deemed a revocation of the related consents and your consents will continue to be deemed delivered.

Beneficial owners desiring to withdraw Old Notes previously tendered through the ATOP procedures should contact the DTC participant through which they hold their Old Notes. In order to withdraw Old Notes previously tendered, a DTC participant may, prior to the Expiration Date of the exchange offers, withdraw its instruction previously transmitted through ATOP by (1) withdrawing its acceptance through ATOP, or (2) delivering to the exchange agent by mail, hand delivery or facsimile transmission, notice of withdrawal of such instruction. The notice of withdrawal must contain the name and number of the DTC participant, the series of Old Notes subject to the notice and the principal amount of each series of Old Notes subject to the notice. Withdrawal of a prior instruction will be effective upon receipt of such notice of withdrawal by the exchange agent. All signatures on a notice of withdrawal must be guaranteed by a recognized participant in the Securities Transfer Agents Medallion Program, the NYSE Medallion Signature Program or the Stock Exchange Medallion Program, except that signatures on the notice of withdrawal need not be guaranteed if the Old Notes being withdrawn are held for the account of an eligible institution. A withdrawal of an instruction must be executed by a DTC participant in the same manner as such DTC participant’s name appears on its transmission through ATOP to which the withdrawal relates. A DTC participant may withdraw a tender only if the withdrawal complies with the provisions described in this section.

If you are a beneficial owner of Old Notes issued in certificated form and have tendered these notes (but not through DTC) and you wish to withdraw your tendered notes, you should contact the exchange agent for instructions.

Withdrawals of tenders of Old Notes may not be rescinded and any Old Notes withdrawn will thereafter be deemed not validly tendered for purposes of the exchange offers. Properly withdrawn Old Notes, however, may be re-tendered by following the procedures described above at any time prior to the Expiration Date of the applicable exchange offer.

Miscellaneous

All questions as to the validity, form, eligibility (including time of receipt) and acceptance for exchange of any tender of Old Notes in connection with the exchange offers will be determined by us and our determination will be final and binding. We reserve the right to reject any or all tenders not in proper form or the acceptance for exchange of which may be unlawful. We also reserve the right to waive any defect or irregularity in the tender of any Old Notes in the exchange offers, and our interpretation of the terms and conditions of the exchange offers (including the instructions in the letter of transmittal and consent) will be final and binding on all parties. None of Occidental, its subsidiaries, Anadarko, Anadarko HoldCo, Anadarko Finance, Kerr-McGee, the exchange agent, the information agent, the dealer managers or the trustees under the Old Notes Indentures or our Indenture will be under any duty to give notification of any defects or irregularities in tenders or incur any liability for failure to give any such notification.

Tenders of Old Notes involving any irregularities will not be deemed to have been made until such irregularities have been cured or waived (which waiver may be made by us, in whole or in part, except that we may not waive (i) the condition that the registration statement of which this prospectus forms a part be declared effective by the SEC and remain effective on the Settlement Date or (ii) the condition that the merger has been completed

or will be completed by the Settlement Date). Old Notes received by the exchange agent in connection with any exchange offer that are not validly tendered and as to which the irregularities have not been cured or waived will be returned by the exchange agent to the participant who delivered such Old Notes by crediting an account maintained at DTC designated by such participant promptly after the Expiration Date of the applicable exchange offer or the withdrawal or termination of the applicable exchange offer.

We or any of our affiliates may, to the extent permitted by applicable law and the applicable Old Notes Indenture, after the Settlement Date, acquire, discharge, defease or redeem the Old Notes that are not tendered and accepted in the exchange offers, whether through open market purchases, privately negotiated transactions, tender offers, exchange offers, redemption, discharge, defeasance or otherwise, upon such terms and at such prices as we may determine or as may be provided for in the applicable Old Notes Indenture, as the case may be. The terms of any such transaction may be more or less favorable to holders than the terms of the applicable exchange offer. We cannot assure you whether we or our affiliates will choose to pursue any of these alternatives.

Transfer Taxes

We will pay all transfer taxes, if any, applicable to the transfer and sale of Old Notes to us in the exchange offers. If transfer taxes are imposed for any other reason, the amount of those transfer taxes, whether imposed on the registered holders or any other persons, will be payable by the tendering holder.

If satisfactory evidence of payment of or exemption from those transfer taxes is not submitted with the letter of transmittal and consent, the amount of those transfer taxes will be billed directly to the tendering holder and/or withheld from any payments due with respect to the Old Notes tendered by such holder.

U.S. Federal Backup Withholding

Under current U.S. federal income tax law, the exchange agent (as payers) may be required under the backup withholding rules to withhold a portion of any payments made to certain holders (or other payees) of Old Notes pursuant to the exchange offers and consent solicitations. To avoid such backup withholding, each tendering holder of the Old Notes must timely provide the exchange agent with such holder’s correct taxpayer identification number (“TIN”) on IRS Form W-9 (available from the IRS website at http://www.irs.gov), or otherwise establish a basis for exemption from backup withholding (currently imposed at a rate of 24%). Certain holders (including, among others, all corporations and certain foreign persons) are exempt from these backup withholding requirements. Exempt holders should furnish their TIN, provide the applicable codes in the box labeled “Exemptions,” and sign, date and send the IRS Form W-9 to the exchange agent. Foreign persons, including entities, may qualify as exempt recipients by submitting to the exchange agent a properly completed IRS Form W-8BEN or IRS Form W-8BEN-E (or other applicable form), signed under penalties of perjury, attesting to that holder’s foreign status. Backup withholding will be applied to the otherwise exempt recipients that fail to provide the required documentation. The applicable IRS Form W-8BEN or IRS Form W-8BEN-E can be obtained from the IRS or from the exchange agent. If a holder is an individual who is a U.S. citizen or resident, the TIN is generally his or her social security number. If the exchange agent is not provided with the correct TIN, a $50 penalty may be imposed by the IRS and/or payments made with respect to Old Notes exchanged pursuant to the exchange offers and consent solicitations may be subject to backup withholding. Failure to comply truthfully with the backup withholding requirements, if done willfully, may also result in the imposition of criminal and/or civil fines and penalties. See IRS Form W-9 for additional information.

If backup withholding applies, the exchange agent would be required to withhold on any payments made to the tendering holders (or other payee). Backup withholding is not an additional tax. A holder subject to the backup withholding rules will be allowed a credit of the amount withheld against such holder’s U.S. federal income tax liability, and, if backup withholding results in an overpayment of tax, the holder may be entitled to a refund, provided the requisite information is correctly furnished to the IRS in a timely manner.

Each of Occidental, Anadarko, Anadarko HoldCo, Anadarko Finance and Kerr-McGee reserves the right in its sole discretion to take all necessary or appropriate measures to comply with its respective obligations regarding backup withholding.

exchange offers of the Old Notes should be sent or delivered by each holder of the Old Notes, or a beneficial owner’s custodian bank, depositary, broker, trust company or other nominee, to GBSC at the address and telephone number set forth on the back cover page of this prospectus.

We will pay the exchange agent’s reasonable and customary fees for their services and will reimburse them for their reasonable, out-of-pocket expenses in connection therewith.

Information Agent

GBSC has been appointed as the information agent for the exchange offers and consent solicitations for the Old Notes, and will receive customary compensation for its services.

Questions concerning tender procedures and requests for additional copies of this prospectus or the letter of transmittal and consent should be directed to the information agent at the addresses and telephone numbers set forth on the back cover page of this prospectus. Holders of any Old Notes issued in certificated form and that are held of record by a custodian bank, depositary, broker, trust company or other nominee may also contact such record holder for assistance concerning the exchange offers.

Dealer Managers

We have retained BofA Securities, Inc., Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Wells Fargo Securities, LLC to act as dealer managers in connection with the exchange offers and consent solicitations for the Old Notes. We will pay the dealer managers a customary fee as compensation for their services. That fee is based on the size and success of the exchange offers and consent solicitations and will be payable on completion of the exchange offers and consent solicitations. We have also agreed to reimburse the dealer managers for certain expenses. The obligations of the dealer managers to perform their functions are subject to various conditions. We have agreed to indemnify the dealer managers against various liabilities, including various liabilities under the federal securities laws. The dealer managers may contact holders of the Old Notes by mail, telephone, facsimile transmission, personal interviews and otherwise may request broker dealers and the other nominee holders to forward materials relating to the exchange offers and consent solicitations to beneficial holders. Questions regarding the terms of the exchange offers and dealer managers may be directed to the dealer managers at their addresses and telephone numbers listed on the back cover page of this prospectus. At any given time, the dealer managers may trade the Old Notes or other of our securities for their own accounts or for the accounts of their customers and, accordingly, may hold a long or short position in the Old Notes. Certain of the dealer managers and their respective affiliates have, from time to time, performed, and may in the future perform, various financial advisory and investment banking services for us, for which they received or will receive customary fees and expenses. The dealer managers are full service financial institutions engaged in various activities, which may include sales and trading, commercial and investment bank, advisory, investment management, investment research, principal investment, hedging, market making, brokerage and other financial and non-financial activities and services. For example, BofA Securities, Inc. and Citigroup Global Markets Inc. acted as our financial advisors in connection with the merger. In addition, BofA Securities, Inc., Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Wells Fargo Securities, LLC or their respective affiliates, together with certain other financial institutions, (i) committed to provide a 364-day senior unsecured bridge loan in connection with the merger, (ii) acted as lead arrangers, bookrunners and lenders with respect to our term loan agreement to, among other things, finance a portion of the merger and (iii) acted as lead arrangers, bookrunners and lenders with respect to our amended and restated credit agreement. In addition, an affiliate of Citigroup Global Markets Inc. is the administrative agent agent and an affiliate of J.P. Morgan Securities LLC is a documentation under our term loan agreement. In addition, if any of the dealer managers or their affiliates has a lending relationship with us, certain of those dealer managers or their affiliates routinely hedge, certain of their underwriters or their affiliates are likely to hedge and certain other of those dealer managers or their affiliates may hedge, their credit exposure to us consistent with their customary risk management policies. Typically, these dealer managers and their affiliates would hedge such exposure of short positions in our securities, including potentially the notes offered hereby. Any such credit default swaps or short positions could adversely affect future trading prices of the Oxy Notes.

Other Fees and Expenses

The expenses of soliciting tenders and consents with respect to the Old Notes will be borne by us. Solicitations may be made by facsimile transmission, telephone or in person by the dealer managers, as well as by officers and other employees of Occidental and its affiliates.

Tendering holders of the Old Notes will not be required to pay any fee or commission to the dealer managers or Occidental. However, if a tendering holder handles the transaction through its broker, dealer, commercial bank, trust company or other institution, that holder may be required to pay brokerage fees or commissions.

DESCRIPTION OF THE DIFFERENCES BETWEEN THE OXY NOTES AND THE OLD NOTES

The following is a summary comparison of the material terms of the Oxy Notes and the Old Notes that differ. The Oxy Notes issued in the applicable exchange offers will be governed by our Indenture. This summary does not purport to be complete and is qualified in its entirety by reference to our Indenture and the Old Notes Indentures. Copies of those indentures are filed as exhibits to the registration statement of which this prospectus forms a part and are also available from the information agent upon request.

Other terms used in the comparison of the Oxy Notes and the Old Notes below and not otherwise defined in this prospectus have the meanings given to those terms in our Indenture or the Old Notes Indentures, as applicable. Article and section references in the descriptions of the notes below refer to the indenture under which the applicable notes were or will be issued.

The description of the Old Notes reflects the Old Notes as currently constituted and does not reflect any changes to the covenants and other terms of the Old Notes or the Old Notes Indentures that may be effected following the consent solicitations as described under “The Proposed Amendments.” The summary of the Old Notes reflects a summary of the Anadarko 2006 Old Notes Indenture with any material differences in earlier Old Notes Indentures noted.

THE PROPOSED AMENDMENTS

We are soliciting the consent of the holders of the Old Notes to, among other things, eliminate substantially all of the restrictive covenants in the Old Notes Indentures and eliminate the payment cross-default Events of Default in the Anadarko 1995 Old Notes Indenture, Anadarko 1997 Old Notes Indenture, Anadarko Finance 2001 Old Notes Indenture and Anadarko 2006 Old Notes Indenture. If the proposed amendments described below become effective with respect to any series of Old Notes, the amendments will apply to all Old Notes of such series not tendered in the applicable exchange offer. Thereafter, all such Old Notes will be governed by the relevant Old Notes Indenture as amended by the proposed amendments, which will have fewer restrictive terms and afford reduced protections to the holders of those securities compared to those currently in the Old Notes Indentures or those applicable to the Oxy Notes. See “Risk Factors—Risks Relating to the Exchange Offers and Consent Solicitations—If the proposed amendments become effective, the Old Notes Indentures will have fewer restrictive terms and afford reduced protections to the holders of those securities compared to those currently in the Old Notes Indentures or those applicable to the Oxy Notes.”

The descriptions below of the provisions of the Old Notes Indentures to be eliminated or modified do not purport to be complete and are qualified in their entirety by reference to the Old Notes Indentures and the forms of supplemental indentures to the Old Notes Indentures that contain the amendments to become effective if the Requisite Consents are obtained. Copies of the forms of supplemental indentures are attached as exhibits to the registration statement of which this prospectus forms a part.

The proposed amendments for each of the Old Notes Indentures with respect to each series of Old Notes constitute a single proposal with respect to that series of notes, and a consenting holder of that series of Old Notes must consent to the proposed amendments in their entirety and may not consent selectively with respect to certain of the proposed amendments.

Pursuant to the Old Notes Indentures and related supplemental indentures for each series of Old Notes, the proposed amendments require that the Requisite Consent with respect to the applicable series of Old Notes must be received. The Requisite Consents are set forth in the table below. Any Old Notes held by Anadarko, Anadarko HoldCo, Anadarko Finance, Kerr-McGee or any person directly or indirectly controlling, controlled by or under direct or indirect common control with Anadarko, Anadarko HoldCo, Anadarko Finance or Kerr-McGee are not considered to be “outstanding” for this purpose.

The table below sets forth, with respect to each series of Old Notes, among other things: the relevant Old Notes Indenture, the guarantor under the relevant Old Notes Indenture and the requisite consent applicable to such series of Old Notes (the “Requisite Consents”):