Exhibit 1.1

MARATHON OIL CORPORATION

DEBT SECURITIES

Underwriting Agreement

March 26, 2024

To the Representatives named in

Schedule I hereto of the Underwriters

Named in Schedule II hereto

Ladies and Gentlemen:

Marathon Oil Corporation, a Delaware corporation (the “Company”), proposes to issue and sell to the underwriters named in Schedule II hereto (the “Underwriters”), for whom you are acting as representatives (the “Representatives”), the principal amount of its debt securities identified in Schedule I hereto (the “Securities”), to be issued under the indenture specified in Schedule I hereto (the “Indenture”) between the Company and the Trustee identified in Schedule I hereto (the “Trustee”). If the firm or firms listed in Schedule II hereto include only the firm or firms listed in Schedule I hereto, then the terms “Underwriters” and “Representatives”, as used herein, shall each be deemed to refer to such firm or firms.

The Company has prepared and filed with the Securities and Exchange Commission (the “Commission”) in accordance with the provisions of the Securities Act of 1933, as amended, and the rules and regulations of the Commission thereunder (collectively, the “Securities Act”), a registration statement (the file number of which is set forth in Schedule I hereto) on Form S-3, including a prospectus (the “Base Prospectus”) relating to certain debt securities to be issued from time to time by the Company. The Company also has filed with, or proposes to file with, the Commission pursuant to Rule 424 under the Securities Act a prospectus supplement specifically relating to the Securities (the “Prospectus Supplement”). The registration statement, as amended to the date of this underwriting agreement (this “Agreement”), including the information, if any, deemed pursuant to Rule 430A, 430B or 430C under the Securities Act to be part of the registration statement at the time of its effectiveness (the “Rule 430 Information”), is hereinafter referred to as the “Registration Statement”; and as used herein, the term “Prospectus” means the Base Prospectus as supplemented by the prospectus supplement specifically relating to the Securities in the form first used (or made available upon request of purchasers pursuant to Rule 173 under the Securities Act) in connection with the confirmation of sales of the Securities and the term “Preliminary Prospectus” means the preliminary prospectus supplement specifically relating to the Securities together with the Base Prospectus. If the Company has filed an abbreviated registration statement pursuant to Rule 462(b) under the Securities Act (the “Rule 462 Registration Statement”), then any reference herein to the term “Registration Statement” shall be deemed to include such Rule 462 Registration Statement. References herein to the Registration Statement, the Base Prospectus, any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the Securities Act that were filed on or before the date of this Agreement or the issue date of the Base Prospectus, any Preliminary Prospectus or the Prospectus, as the case may be. The terms “supplement”, “amendment”, and “amend” as used herein with respect to the Registration Statement, any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include any documents filed by the Company under the Securities Exchange Act of 1934, as amended, and the rules and regulations of the Commission thereunder (collectively, the “Exchange Act”) after the date of this Agreement or the issue date of the Base Prospectus, any Preliminary Prospectus or the Prospectus, as the case may be, which are deemed to be incorporated by reference therein. “Effective Date” shall mean each date and time that the Registration Statement and any post-effective amendment or amendments thereto and any Rule 462(b) Registration Statement became or becomes effective.

At or prior to the time when sales of the Securities will be first made (the “Time of Sale”), the Company has prepared the following information (collectively, the “Time of Sale Information”): a Preliminary Prospectus dated March 26, 2024 (including the documents incorporated by reference therein as of the Time of Sale), and the information identified in Schedule IIIA hereto.

The Company hereby agrees with the Underwriters as follows:

1. The Company agrees to issue and sell the Securities to the several Underwriters as hereinafter provided, and each Underwriter, on the basis of the representations, warranties and agreements herein contained, and upon the terms but subject to the conditions hereinafter stated, agrees to purchase, severally and not jointly, from the Company the respective principal amount of Securities set forth opposite such Underwriter’s name in Schedule II hereto at the purchase price set forth in Schedule I hereto.

2. (a) The Company understands that the several Underwriters intend (i) to make a public offering of their respective portions of the Securities and (ii) initially to offer the Securities upon the terms set forth in the Time of Sale Information and the Prospectus.

(b) The Company acknowledges and agrees that the Underwriters are acting solely in the capacity as principal in an arm’s length contractual counterparty to the Company with respect to any offering of Securities contemplated hereby (including in connection with determining the terms of the offering) and not as a financial advisor or a fiduciary to, or an agent of, the Company or any other person. Additionally, no such Underwriter is advising the Company or any other person as to any legal, tax, investment, accounting or regulatory matters in any jurisdiction. The Company shall consult with its own advisors concerning such matters and shall be responsible for making its own independent investigation and appraisal of the transactions contemplated hereby, and such Underwriters shall have no responsibility or liability to the Company with respect thereto. Any review by such Underwriters of the Company, the transactions contemplated hereby or other matters relating to such transactions will be performed solely for the benefit of the Underwriters and shall not be on behalf of the Company. The Company agrees that it will not claim that the Underwriters have rendered advisory services of any nature or respect, or owe an agency, fiduciary or similar duty to the Company, in connection with such transaction or the process leading thereto. The Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company and the Underwriters have no obligation to disclose any of such interests by virtue of any advisory, agency, fiduciary or similar relationship.

3. Payment for the Securities shall be made by wire transfer in immediately available funds to the account specified by the Company to the Representatives, no later than noon on the Business Day (as defined below) prior to the Closing Date (as defined below), on the date and at the time and place set forth in Schedule I hereto (or at such other time and place on the same or such other date, not later than the seventh Business Day thereafter, as you and the Company may agree in writing). As used herein, the term “Business Day” means any day other than a day on which banks are permitted or required to be closed in New York City. The time and date of such payment and delivery with respect to the Securities are referred to herein as the “Closing Date”.

Payment for the Securities shall be made against delivery to the nominee of The Depository Trust Company for the respective accounts of the several Underwriters of the Securities of one or more global notes (each, a “Global Note”) representing the Securities, with any transfer taxes payable in connection with the transfer to the Underwriters of the Securities duly paid by the Company. Each Global Note will be made available for inspection by the Representatives at such place as the Representatives and the Company shall agree not later than 1:00 p.m., New York City time, on the Business Day prior to the Closing Date.

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4. The Company represents and warrants to and agrees with each of the Underwriters that:

(a) The Registration Statement is an “automatic shelf registration statement” as defined under Rule 405 of the Securities Act that has been filed with the Commission not earlier than three years prior to the date hereof; and no notice of objection of the Commission to the use of such registration statement or any post-effective amendment thereto pursuant to Rule 401(g)(2) under the Securities Act has been received by the Company. No stop order suspending the effectiveness of the Registration Statement has been issued by the Commission and no proceeding for that purpose or pursuant to Section 8A of the Securities Act against the Company or related to the offering has been initiated or threatened by the Commission; as of the Effective Date, the Registration Statement complied in all material respects with the applicable requirements of the Securities Act and the Trust Indenture Act of 1939, as amended, and the rules and regulations of the Commission thereunder (collectively, the “Trust Indenture Act”), and did not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; and as of the date of the Prospectus and any amendment or supplement thereto and as of the Closing Date, the Prospectus did not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the Company makes no representation and warranty with respect to (i) that part of the Registration Statement that constitutes the Statement of Eligibility and Qualification (Form T-1) of the Trustee under the Trust Indenture Act or (ii) any statements or omissions in the Registration Statement and the Prospectus and any amendment or supplement thereto made in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use therein, it being understood that the only such information furnished by any Underwriter consists of the information described as such in Section 8(a) hereof. Each preliminary prospectus filed as part of the registration statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 under the Securities Act, complied when so filed in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder.

(b) The Time of Sale Information at the Time of Sale and at the Closing Date did not and will not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the Company makes no representation and warranty with respect to any statements or omissions made in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use in such Time of Sale Information, it being understood that the only such information furnished by any Underwriter consists of the information described as such in Section 8(a) hereof.

(c) The Company (including its agents and representatives, other than the Underwriters in their capacity as such) has not prepared, made, used, authorized, approved or referred to and will not prepare, make, use, authorize, approve or refer to any “issuer free writing prospectus” (as defined in Rule 433 under the Securities Act) (an “Issuer Free Writing Prospectus”) other than (i) the documents listed on Schedule III hereto and (ii) any electronic road show or other written communications including the investor presentation listed in Annex A hereto (the “investor presentation”), in each case approved in writing in advance by the Representatives.

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Each such Issuer Free Writing Prospectus complied in all material respects with the Securities Act, has been or will be (within the time period specified in Rule 433) filed in accordance with the Securities Act (to the extent required thereby) and, when taken together with the Preliminary Prospectus accompanying, or delivered prior to delivery of, or filed prior to the first use of such Issuer Free Writing Prospectus, did not, and at the Time of Sale and at the Closing Date will not, contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the Company makes no representation and warranty with respect to any statements or omissions made in each such Issuer Free Writing Prospectus in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use in any Issuer Free Writing Prospectus, it being understood that the only such information furnished by any Underwriter consists of the information described as such in Section 8(a) hereof. Each Issuer Free Writing Prospectus (including the final term sheet prepared and filed pursuant to Section 5(a) hereto) does not include any information that conflicts with the information contained in the Registration Statement, including any document incorporated therein by reference and any prospectus supplement deemed to be a part thereof that has not been superseded or modified. The foregoing sentence does not apply to statements in or omissions from any Issuer Free Writing Prospectus in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representatives specifically for use therein, it being understood that the only such information furnished by any Underwriter consists of the information described as such in Section 8(a) hereof. The Fixed Income Presentation, dated March 25, 2024 (the “Fixed Income Presentation”) when taken together with the Time of Sale Information, did not, and at the Time of Sale and at the Closing Date will not, contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(d) The documents (the “Incorporated Documents”) incorporated by reference in the Registration Statement, the Prospectus and the Time of Sale Information, when filed with the Commission, conformed or will conform, as the case may be, in all material respects with the requirements of the Exchange Act.

(e) The Company (i) has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware, (ii) has the corporate power and authority to own its property and to conduct its business as described in the Time of Sale Information and the Prospectus and (iii) is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole.

(f) Each subsidiary of the Company which is a significant subsidiary as defined in Rule 1-02(w) of Regulation S-X (a “Significant Subsidiary”) (i) has been duly formed and is validly existing in good standing under the laws of the jurisdiction of its formation, (ii) has the corporate, limited liability company, limited partnership or partnership power and authority to own its property and to conduct its business as described in the Time of Sale Information and the Prospectus and (iii) is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole.

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(g) The authorized capital stock of the Company conforms as to legal matters to the description thereof contained in the Time of Sale Information and the Prospectus.

(h) This Agreement has been duly authorized, executed and delivered by the Company.

(i) The Securities have been duly authorized, and, when issued and delivered pursuant to this Agreement, will have been duly executed, authenticated, issued and delivered and will constitute valid and binding obligations of the Company entitled to the benefits provided by the Indenture; the Indenture has been duly authorized, executed and delivered by the Company and is duly qualified under the Trust Indenture Act and constitutes a valid and binding instrument, enforceable in accordance with its terms, except as the enforceability thereof is subject to the effects of (i) any applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or transfer or other laws relating to or affecting creditors’ rights generally, (ii) general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law) and (iii) any implied covenants of good faith and fair dealing; the Securities and the Indenture will conform to the descriptions thereof in the Time of Sale Information and the Prospectus.

(j) The execution and delivery by the Company of, and the performance by the Company of its obligations under, this Agreement, the Indenture and the Securities will not contravene (i) any provision of applicable law, (ii) the certificate of incorporation or by-laws of the Company or any agreement, (iii) any indenture or other instrument binding upon the Company or any of its subsidiaries or (iv) any judgment, order or decree of any governmental body, agency or court having jurisdiction over the Company or any Significant Subsidiary, except, with respect to clauses (i), (iii) and (iv) only for contraventions which would not, individually or in the aggregate, reasonably be expected to have a material adverse effect on the consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole, and no consent, approval, authorization or order of, or qualification with, any governmental body or agency that has not already been obtained is required for the performance by the Company of its obligations under this Agreement, the Indenture or the Securities, except such as may be required by the securities or Blue Sky laws of the various states in connection with the offer and sale of the Securities.

(k) Neither the Company nor any of its Significant Subsidiaries is in violation of its corporate charter or by-laws or other constitutive document or in default under any agreement, indenture or instrument, which default could reasonably be expected to have a material adverse effect on the consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole, and no event has occurred and no condition exists which, with the giving of notice or the lapse of time or both, would result in any such violation or default which would have such an effect. Except as described in the Time of Sale Information and the Prospectus, neither the Company nor any of its subsidiaries is in violation of any law, ordinance, governmental rule or regulation or court decree to which it may be subject, which violation could reasonably be expected to have a material adverse effect on the consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole.

(l) There has not occurred any material adverse change, or any development involving a prospective material adverse change, in the condition, financial or otherwise, or in the earnings, business or operations of the Company and its subsidiaries, taken as a whole, from that set forth in the Time of Sale Information and the Prospectus (exclusive of any amendments or supplements thereto subsequent to the date of this Agreement).

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(m) There are no legal or governmental investigations or proceedings pending or, to the Company’s knowledge, threatened to which the Company or any of its subsidiaries is a party or to which any of the properties of the Company or any of its subsidiaries is subject, that are required to be described in the Registration Statement, the Time of Sale Information or the Prospectus and are not so described or any statutes, regulations, contracts or other documents that are required to be described in the Registration Statement, the Time of Sale Information or the Prospectus or to be filed as exhibits to the Registration Statement that are not described or filed as required.

(n) To the best of the Company’s knowledge, PricewaterhouseCoopers LLP, which has certified the financial statements of the Company and its consolidated subsidiaries and delivered its report with respect to the audited consolidated financial statements and schedules included or incorporated by reference in the Time of Sale Information and the Prospectus, is an independent registered public accounting firm with respect to the Company within the meaning of the Securities Act and the applicable rules and regulations adopted by the Public Company Accounting Oversight Board.

(o) The Company is not, and after giving effect to the offering and sale of the Securities and the application of the proceeds thereof as described in the Time of Sale Information and the Prospectus will not be, required to register as an “investment company” as such term is defined in the Investment Company Act of 1940, as amended.

(p) The Company is not an ineligible issuer and is a well-known seasoned issuer, in each case as defined under the Securities Act, in each case at the times specified in the Securities Act in connection with the offering of the Securities.

(q) Except as described in each of the Registration Statement, the Time of Sale Information and the Prospectus, (i) the Company and its subsidiaries (A) have complied with all applicable foreign, federal, state and local laws and regulations relating to the protection of human health and safety (with respect to exposure to hazardous or toxic substances) or the environment, including with respect to releases of hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”) and (B) are not subject to any claims or orders, and, to the knowledge of the Company, have no other liabilities or costs, relating to Environmental Laws, except where such noncompliance with Environmental Laws or claims, orders, liabilities and costs would not reasonably be expected to have a material adverse effect on the Company and its subsidiaries, taken as a whole, and (ii) the Company and its subsidiaries are not parties to any governmental proceeding pursuant to Environmental Laws other than those for which they reasonably expect any monetary sanctions will be less than $300,000.

(r) The Company and its subsidiaries possess and have complied with all licenses, sublicenses, certificates, permits and other authorizations issued by, and have made all declarations and filings with, the appropriate federal, state, local or foreign governmental or regulatory authorities that are necessary for the ownership or lease of their respective properties or the conduct of their respective businesses as described in each of the Registration Statement, the Time of Sale Information and the Prospectus, except where the failure to possess, comply or make the same could not reasonably be expected to have a material adverse effect on the consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole; and except as described in each of the Registration Statement, the Time of Sale Information and the Prospectus, neither the Company nor any of its subsidiaries has received notice of any revocation or modification of any such license, sub-license, certificate, permit or authorization or has any reason to believe that any such license, sub-license, certificate, permit or authorization will not be renewed in the ordinary course, except where such revocation, modification or renewal would not reasonably be expected to have a material adverse effect on the consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole.

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(s) Neither the Company nor any of its subsidiaries, nor, to the knowledge of the Company, any director, officer, employee, affiliate, agent or representative of the Company or of any of its subsidiaries (in each case, in his or her capacity as such), has taken any action in furtherance of an offer, payment, promise to pay, or authorization or approval of the payment or giving of money, property, gifts or anything else of value, directly or indirectly, to any “government official” (including any officer or employee of a government or government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of any of the foregoing, or any political party or party official or candidate for political office) to influence official action or secure an improper advantage in violation, in any material respect, of any applicable anti-corruption laws; to the knowledge of the Company, the Company and its subsidiaries have conducted their businesses in compliance in all material respects with applicable anti-corruption laws and have instituted and maintain policies and procedures designed to promote and achieve compliance in all material respects with such laws; and neither the Company nor any of its subsidiaries will use, directly or indirectly, the proceeds of the offering in furtherance of an offer, payment, promise to pay, or authorization of the payment or giving of money, or anything else of value, to any person in violation of any applicable anti-corruption laws.

(t) The operations of the Company and its subsidiaries are and have been conducted at all times in material compliance with all applicable financial recordkeeping and reporting requirements, including those of the Bank Secrecy Act, as amended by Title III of the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA PATRIOT Act), and the applicable anti-money laundering statutes of jurisdictions where the Company and its subsidiaries conduct business, the rules and regulations thereunder and any related rules, regulations or guidelines, issued, administered or enforced by any governmental agency with jurisdiction over the Company or any of its subsidiaries (collectively, the “Anti-Money Laundering Laws”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Anti-Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

(u) (i) Neither the Company nor any of its subsidiaries, nor, to the Company’s knowledge, any director, officer, employee, agent, affiliate or representative of the Company or any of its subsidiaries, is an individual or entity (“Person”) that is, or is owned or controlled by a Person that is:

(A) the subject of any sanctions administered or enforced by the U.S. Department of Treasury’s Office of Foreign Assets Control, the U.S. Department of State and including, without limitation, the designation as a “specially designated national” or “blocked person”, the United Nations Security Council, the European Union, the United Kingdom (including His Majesty’s Treasury), or other relevant sanctions authority with jurisdiction over the Company or any of its subsidiaries (collectively, “Sanctions”), nor (B) to the extent such is prohibited by Sanctions, located, organized or resident in a country or territory that is the subject of Sanctions (including, without limitation, Cuba, Iran, North Korea, Syria, Venezuelan State-owned entities, the so-called Donetsk People’s Republic, the so-called Luhansk People’s Republic, the non-government controlled areas of the Zaporizhzhia and Kherson Regions of Ukraine, the Crimea region of Ukraine and other Covered Regions (as defined in the Executive Order 14065) of Ukraine identified pursuant to the Executive Order 14065).

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(ii) The Company will not, directly or indirectly, use any of the proceeds of the offering, or lend, contribute or otherwise make available any such proceeds to any subsidiary, joint venture partner or other Person:

(A) to fund or facilitate any activities or business of or with any Person or in any country or territory that, at the time of such funding or facilitation, is the subject of Sanctions; or

(B) in any other manner that would result in a violation of Sanctions by any Person (including any Person participating in the offering, whether as underwriter, advisor, investor or otherwise).

(iii) For the past 5 years, the Company and its subsidiaries have not knowingly engaged in, are not now knowingly engaged in, and will not engage in any dealings or transactions with any Person, or in any country or territory, that at the time of the dealing or transaction is or was, to the Company’s knowledge, the subject of Sanctions in violation of such Sanctions.

(v) The Company and its subsidiaries have implemented and maintained commercially reasonable controls, policies, procedures, and safeguards to maintain and protect their material confidential information and the integrity, continuous operation, redundancy and security of all the Company and its subsidiaries’ information technology assets and equipment, computers, systems, networks, hardware, software, websites, applications, and databases (collectively, “IT Systems”) and data (including all personal, personally identifiable, sensitive, confidential or regulated data (“Personal Data”)) used in connection with their businesses, and, to the knowledge of the Company and its subsidiaries, there have been no material breaches, violations, outages or unauthorized uses of or accesses to the same, except for those that have been remedied without material cost or liability, nor any incidents under internal review or investigations relating to the same. To the knowledge of the Company and its subsidiaries, the Company and its subsidiaries are presently in material compliance with all applicable laws or statutes and all judgments, orders, rules and regulations of any court or arbitrator or governmental or regulatory authority, internal policies and contractual obligations relating to the privacy and security of IT Systems and Personal Data and to the protection of such IT Systems and Personal Data from unauthorized use, access, misappropriation or modification.

(w) The interactive data in eXtensbile Business Reporting Language included or incorporated by reference in the Registration Statement, the Time of Sale Information and the Prospectus fairly presents the information called for in all material respects and has been prepared in accordance with the Commission’s rules and guidelines applicable thereto.

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5. The Company covenants and agrees with each of the several Underwriters as follows:

(a) to file the Preliminary Prospectus in a form approved by you pursuant to Rule 424 under the Securities Act as required by Rule 424(b); to file the Prospectus in a form approved by you pursuant to Rule 424 under the Securities Act not later than the Commission’s close of business on the second Business Day following the date of this Agreement or, if applicable, such earlier time as may be required by Rule 424(b) and 430B under the Securities Act; to pay the registration fees for this offering within the time period required by Rule 456(b)(1)(i) under the Securities Act (without giving effect to the proviso therein) and in any event prior to the Closing Date; and to file any Issuer Free Writing Prospectus (including the final term sheet in the form of Schedule IV hereto) to the extent required by Rule 433 under the Securities Act;

(b) to furnish to you, without charge, five conformed copies of the Registration Statement (including exhibits thereto) and for delivery to each other Underwriter a conformed copy of the Registration Statement (without exhibits thereto) and to furnish to you in New York City, without charge, prior to 10:00 a.m. New York City time on the Business Day next succeeding the date of this Agreement and during the period mentioned in Section 5(f) or 5(g) below, as many copies of the Time of Sale Information, the Prospectus and each Issuer Free Writing Prospectus (if applicable) and any supplements and amendments thereto or to the Registration Statement as you may reasonably request;

(c) from the date hereof and prior to the Closing Date, to furnish to you a copy of each proposed free writing prospectus, any proposed amendment or supplement to the Registration Statement, the Preliminary Prospectus or the Prospectus, for your review, and not to use or file any such proposed free writing prospectus (as defined below), amendment or supplement to which you reasonably object;

(d) not to take any action that would result in an Underwriter or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of the Underwriter that the Underwriter otherwise would not have been required to file thereunder;

(e) to file promptly all reports and any definitive proxy or information statements required to be filed by the Company with the Commission pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act for so long as the delivery of a prospectus is required in connection with the offering or sale of the Securities, and during such same period, to advise you promptly, and to confirm such advice in writing, (i) when any amendment to the Registration Statement shall have become effective, (ii) of any request by the Commission for any amendment to the Registration Statement or any amendment or supplement to the Prospectus or for any additional information, (iii) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or the initiation or threatening of any proceeding for that purpose and (iv) of the receipt by the Company of any notification with respect to any suspension of the qualification of the Securities for offer and sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose; and to use its best efforts to prevent the issuance of any such stop order or notification and, if issued, to obtain as soon as possible the withdrawal thereof;

(f) if at any time prior to the Closing Date (i) any event shall occur or condition shall exist as a result of which the Time of Sale Information as then amended or supplemented would include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading or (ii) it is necessary to amend or supplement the Time of Sale Information to comply with law, the Company will promptly notify the Underwriters thereof and forthwith prepare and, subject to paragraph (c) above, file with the Commission (to the extent required) and furnish to the Underwriters and to such dealers as the Representatives may designate, such amendments or supplements to the Time of Sale Information as may be necessary so that the statements in the Time of Sale Information as so amended or supplemented will not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading or so that the Time of Sale Information will comply with law;

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(g) if, during such period after the first date of the public offering of the Securities as in the opinion of counsel for the Underwriters the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) under the Securities Act) is required by law to be delivered in connection with sales by an Underwriter or dealer, any event shall occur as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) under the Securities Act) is delivered to a purchaser, not misleading, or if it is necessary to amend or supplement the Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at the expense of the Company, to the Underwriters and to the dealers (whose names and addresses you have furnished to the Company) to which Securities may have been sold by you on behalf of the Underwriters and to any other dealers upon request, such amendments or supplements to the Prospectus as may be necessary so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) under the Securities Act) is delivered to a purchaser, be misleading or so that the Prospectus, as amended or supplemented, will comply with applicable law;

(h) to endeavor to qualify the Securities for offer and sale under the securities or Blue Sky laws of such jurisdictions as you shall reasonably request and to continue such qualification in effect so long as reasonably required for distribution of the Securities; provided that in connection therewith the Company shall not be required to qualify as a foreign corporation or to file a general consent to service of process in any jurisdiction or to subject itself to taxation in any jurisdiction;

(i) to make generally available to the Company’s security holders and to you as soon as practicable an earnings statement that satisfies the provisions of Section 11(a) of the Securities Act and the rules and regulations (including Rule 158) of the Commission thereunder covering a period of at least twelve months beginning with the first fiscal quarter of the Company occurring after the “effective date” (as defined in Rule 158) of the Registration Statement;

(j) during the period beginning on the date hereof and continuing to and including the Business Day following the Closing Date (unless a different period is set forth in the Time of Sale Information and the Prospectus, in which case during such period), not to offer, sell, contract to sell or otherwise dispose of any debt securities of or guaranteed by the Company which are substantially similar to the Securities; provided, however, for the avoidance of doubt, the foregoing restrictions shall not restrict issuances under the Company’s existing commercial paper program;

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(k) to use the net proceeds received by the Company from the sale of the Securities pursuant to this Agreement in the manner specified in the Time of Sale Information and the Prospectus under the caption “Use of Proceeds”; and (l) whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, to pay or cause to be paid all costs and expenses incident to the performance of its obligations hereunder, including without limiting the generality of the foregoing, all costs and expenses (i) incident to the preparation, issuance, execution, authentication and delivery of the Securities, including any expenses of the Trustee, (ii) incident to the preparation, printing and filing under the Securities Act of the Registration Statement, the Time of Sale Information, the Prospectus and any preliminary prospectus or Issuer Free Writing Prospectus (including in each case all exhibits, amendments and supplements thereto), (iii) incurred in connection with the registration or qualification and determination of eligibility for investment of the Securities under the laws of such jurisdictions as the Underwriters may designate (including reasonable fees and disbursements of counsel for the Underwriters associated therewith), (iv) related to any filing with the Financial Industry Regulatory Authority (“FINRA”) in connection with any review by FINRA of the terms of the sale of the securities pursuant to this Agreement, (v) in connection with the printing (including word processing and duplication costs) and delivery of this Agreement, the Indenture, any Blue Sky memoranda relating to the offer and sale of the Securities and the furnishing to Underwriters and dealers of copies of the Registration Statement, the Time of Sale Information and the Prospectus, including mailing and shipping, as herein provided, (vi) payable to rating agencies in connection with the rating of the Securities and (vii) incurred by the Company in connection with a “road show” presentation to potential investors, including the investor presentation.

6. The Company agrees that, unless it has obtained or will obtain, as the case may be, the prior written consent of the Representatives, and each Underwriter, severally and not jointly, agrees with the Company that, unless it has obtained or will obtain, as the case may be, the prior written consent of the Company, it has not made and will not make any offer relating to the Securities that would constitute an Issuer Free Writing Prospectus or that would otherwise constitute a “free writing prospectus” (as defined in Rule 405) required to be filed by the Company with the Commission or retained by the Company under Rule 433, other than a free writing prospectus containing the information contained in the final term sheet prepared and filed pursuant to Section 5(a) hereto; provided that the prior written consent of the parties hereto shall be deemed to have been given in respect of the Free Writing Prospectuses included in Schedule III hereto and Annex A hereto. Any such free writing prospectus consented to by the Representatives or the Company is hereinafter referred to as a “Permitted Free Writing Prospectus”. The Company agrees that (x) it has treated and will treat, as the case may be, each Permitted Free Writing Prospectus as an Issuer Free Writing Prospectus and (y) it has complied and will comply, as the case may be, with the requirements of Rules 164 and 433 applicable to any Permitted Free Writing Prospectus, including in respect of timely filing with the Commission, legending and record keeping.

7. The several obligations of the Underwriters hereunder shall be subject to the following conditions:

(a) the representations and warranties of the Company contained herein are true and correct on the date hereof, as of the Time of Sale and as of the Closing Date and the Company shall have complied with all agreements and all conditions on its part to be performed or satisfied hereunder at or prior to the Closing Date;

(b) the Preliminary Prospectus, the Prospectus and each Issuer Free Writing Prospectus shall have been filed with the Commission within the applicable time period prescribed for such filing by the rules and regulations under the Securities Act (in the case of an Issuer Free Writing Prospectus, to the extent required by Rule 433 under the Securities Act); no stop order suspending the effectiveness of the Registration Statement shall be in effect, and no proceedings for such purpose or pursuant to Section 8A of the Securities Act shall be pending before or threatened by the Commission; and all requests for additional information on the part of the Commission shall have been complied with to your reasonable satisfaction; (c) subsequent to the execution and delivery of this Agreement and prior to the Closing Date, there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review, with possible negative implications, of the rating accorded any of the Company’s debt securities by any “nationally recognized statistical rating organization”, as such term is defined in Section 3(a)(62) of the Exchange Act;

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(d) since the respective dates as of which information is given in the Time of Sale Information and the Prospectus there shall not have been any change in the capital stock of the Company or the long-term debt of the Company or any of its subsidiaries or any material adverse change, or any development involving a prospective material adverse change, in or affecting the general affairs, business, management, financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole, otherwise than as set forth or contemplated in the Time of Sale Information and the Prospectus, the effect of which in the judgment of the Representatives makes it impracticable or inadvisable to proceed with the public offering or the delivery of the Securities on the terms and in the manner contemplated in the Time of Sale Information and the Prospectus;

(e) the Representatives shall have received on and as of the Closing Date a certificate of an officer of the Company reasonably satisfactory to you with respect to the matters set forth in Sections 7(a), 7(b) and 7(c) and to the further effect that there has not occurred any material adverse change, or any development involving a prospective material adverse change, in the general affairs, business, management, financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole, otherwise than as set forth or contemplated in the Time of Sale Information and the Prospectus;

(f) the Underwriters shall have received on the Closing Date a written opinion and a negative assurance letter of Kirkland & Ellis LLP, outside counsel for the Company, each addressed to the Representatives and dated as of such Closing Date, in form and substance reasonably satisfactory to the Underwriters;

(g) the Underwriters shall have received on the Closing Date an opinion of Kimberly O. Warnica, Esq., Executive Vice President, General Counsel and Secretary for the Company, addressed to the Representatives and dated as of such Closing Date, in form and substance reasonably satisfactory to the Underwriters;

The opinions of Kirkland & Ellis LLP and Kimberly O. Warnica, Esq. referred to in paragraphs 7(f) and 7(g) above shall be rendered to the Underwriters at the request of the Company and shall so state therein.

(h) on the date of this Agreement and on the Closing Date, PricewaterhouseCoopers LLP shall have furnished to you letters dated such dates, in form and substance reasonably satisfactory to you, containing statements and information of the type customarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information included or incorporated by reference in the Registration Statement, the Time of Sale Information and the Prospectus; provided that the letter delivered on the Closing Date shall use a “cut-off” date no more than two business days prior to such Closing Date;

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(i) you shall have received on and as of the Closing Date an opinion and negative assurance letter of Cravath, Swaine & Moore LLP, counsel to the Underwriters, each addressed to the Representatives and dated as of such Closing Date, in form and substance reasonably satisfactory to you; and (j) on the date of this Agreement and on the Closing Date, each of Ryder Scott Company, L.P. and Netherland, Sewell & Associates, Inc., reserve engineers for the Company, shall have furnished to you letters dated such dates, in form and substance reasonably satisfactory to you, (a) containing statements and information of the type customarily included in reserve engineers’ “comfort letters” stating the conclusions and findings of such firm with respect to certain of the oil and natural gas reserves of the Company and certain other related information included or incorporated by reference in the Registration Statement, the Time of Sale Information and the Prospectus and (b) stating that such firm is, as of the date thereof, an independent reserve engineer with respect to the Company.

8. (a) The Company agrees to indemnify and hold harmless each Underwriter, its directors and officers and each person, if any, who controls any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act and each affiliate of any Underwriter within the meaning of Rule 405 of the Securities Act, from and against any and all losses, claims, damages and liabilities (including without limitation the legal fees and other expenses reasonably incurred in connection with any suit, action or proceeding or any claim asserted) caused by (i) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, or (ii) any untrue statement or alleged untrue statement of a material fact contained in the Prospectus (or any amendment or supplement thereto), any Preliminary Prospectus, any Issuer Free Writing Prospectus, the Fixed Income Presentation or the Time of Sale Information (or any part thereof), or caused by any omission or alleged omission to state therein a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that the Company will not be liable in any such case to the extent that any such loss, claim, damage or liability is caused by an untrue statement or alleged untrue statement in or omission or alleged omission from any such document in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representatives, if any, specifically for use therein, it being understood that the only such information furnished by any Underwriter consists of the information described as such in the immediately succeeding paragraph of this Section 8(a).

Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, its directors, officers and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act, against any losses, claims, damages or liabilities to which the Company may become subject, under the Securities Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) are caused by (i) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, or (ii) any untrue statement or alleged untrue statement of a material fact contained in the Prospectus (or any amendment or supplement thereto), any Preliminary Prospectus, any Issuer Free Writing Prospectus or the Time of Sale Information (or any part thereof), or caused by any omission or alleged omission to state therein a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in any Registration Statement, the Prospectus (or any amendment or supplement thereto), any Preliminary Prospectus, any Issuer Free Writing Prospectus or the Time of Sale Information (or any part thereof), in reliance upon and in conformity with written information furnished to the Company by such Underwriter through the Representatives expressly for use therein; and will reimburse the Company for any legal or other expenses reasonably incurred by the Company in connection with investigating or defending any such action or claim as such expenses are incurred. The Company hereby acknowledges that the only information furnished to the Company by any Underwriter through the Representatives expressly for use in the Registration Statement, the Prospectus or the Time of Sale Information are the statements set forth in the second sentence of the fourth paragraph, the second sentence of the fifth paragraph and the seventh paragraph, each in the section titled “Underwriting” in the Preliminary Prospectus dated March 26, 2024.

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If any suit, action, proceeding (including any governmental or regulatory investigation), claim or demand shall be brought or asserted against any person in respect of which indemnity may be sought pursuant to either of the two preceding paragraphs, such person (the “Indemnified Person”) shall promptly notify the person against whom such indemnity may be sought (the “Indemnifying Person”) in writing, and the Indemnifying Person, upon request of the Indemnified Person, shall retain counsel reasonably satisfactory to the Indemnified Person to represent the Indemnified Person and any others the Indemnifying Person may designate in such proceeding and shall pay the fees and expenses of such counsel related to such proceeding. In any such proceeding, any Indemnified Person shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Indemnified Person unless (i) the Indemnifying Person and the Indemnified Person shall have mutually agreed to the contrary, (ii) the Indemnifying Person has failed within a reasonable time to retain counsel reasonably satisfactory to the Indemnified Person or (iii) the named parties in any such proceeding (including any impleaded parties) include both the Indemnifying Person and the Indemnified Person and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the Indemnifying Person shall not, in connection with any proceeding or related proceeding in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all Indemnified Persons, and that all such fees and expenses shall be reimbursed as they are incurred. Any such separate firm for the Underwriters and such directors, officers and control persons of Underwriters shall be designated in writing by the first of the named Representatives on Schedule I hereto and any such separate firm for the Company, its directors, officers and control persons of the Company or authorized representatives shall be designated in writing by the Company. The Indemnifying Person shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the Indemnifying Person agrees to indemnify any Indemnified Person from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an Indemnified Person shall have requested an Indemnifying Person to reimburse the Indemnified Person for fees and expenses of counsel as contemplated by the third sentence of this paragraph, the Indemnifying Person agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such Indemnifying Person of the aforesaid request and (ii) such Indemnifying Person shall not have reimbursed the Indemnified Person in accordance with such request prior to the date of such settlement. No Indemnifying Person shall, without the prior written consent of the Indemnified Person, effect any settlement of any pending or threatened proceeding in respect of which any Indemnified Person is or could have been a party and indemnity could have been sought hereunder by such Indemnified Person, unless such settlement (i) includes an unconditional release of such Indemnified Person from all liability on claims that are the subject matter of such proceeding and (ii) does not include a statement as to or an admission of fault, culpability or failure to act, by or on behalf of any indemnified party.

If the indemnification provided for in the first and second paragraphs of this Section 8 is unavailable to an Indemnified Person or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each Indemnifying Person under such paragraph, in lieu of indemnifying such Indemnified Person thereunder, shall contribute to the amount paid or payable by such Indemnified Person as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other hand from the offering of the Securities or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company on the one hand and the Underwriters on the other in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations.

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The relative benefits received by the Company on the one hand and the Underwriters on the other shall be deemed to be in the same respective proportions as the net proceeds from the offering of such Securities (before deducting expenses) received by the Company and the total underwriting discounts and the commissions received by the Underwriters bear to the aggregate public offering price of the Securities. The relative fault of the Company on the one hand and the Underwriters on the other shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

The Company and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section 8 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in the immediately preceding paragraph. The amount paid or payable by an Indemnified Person as a result of the losses, claims, damages and liabilities referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such Indemnified Person in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8, in no event shall an Underwriter be required to contribute any amount in excess of the amount by which the total price at which the Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations to contribute pursuant to this Section 8 are several in proportion to the respective principal amount of the Securities set forth opposite their names in Schedule II hereto, and not joint.

The remedies provided for in this Section 8 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

The indemnity and contribution agreements contained in this Section 8 and the representations and warranties of the Company set forth in this Agreement shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Underwriter or any person controlling any Underwriter or by or on behalf of the Company, its officers or directors or any other person controlling the Company and (iii) acceptance of and payment for any of the Securities.

9. Notwithstanding anything herein contained, this Agreement may be terminated in the absolute discretion of the Representatives, by notice given to the Company, if after the Time of Sale and prior to the Closing Date: (i) trading generally shall have been suspended or materially limited on or by the New York Stock Exchange; (ii) trading in the Company’s common stock shall have been suspended by the Commission or the New York Stock Exchange; (iii) a general moratorium on commercial banking activities in New York shall have been declared by either Federal or New York State authorities; or (iv) there shall have occurred (a) any outbreak or escalation of hostilities or any change in financial markets or any calamity or crisis or (b) a material disruption in securities settlement, payment or clearance services in the United States or other relevant jurisdiction that, in the judgment of the Representatives, is material and adverse and makes it, in the judgment of the Representatives, impracticable to market the Securities on the terms and in the manner contemplated in the Time of Sale Information and the Prospectus.

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10. If, on the Closing Date, any one or more of the Underwriters shall fail or refuse to purchase Securities which it or they have agreed to purchase under this Agreement, and the aggregate principal amount of Securities which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate principal amount of the Securities, the other Underwriters shall be obligated severally in the proportions that the principal amount of Securities set forth opposite their respective names in Schedule II hereto bears to the aggregate principal amount of Securities set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as the Representatives may specify, to purchase the Securities which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date; provided that in no event shall the principal amount of Securities that any Underwriter has agreed to purchase pursuant to Section 1 be increased pursuant to this Section 10 by an amount in excess of one-tenth of such principal amount of Securities without the written consent of such Underwriter. If, on the Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Securities and the aggregate principal amount of Securities with respect to which such default occurs is more than one-tenth of the aggregate principal amount of Securities to be purchased, and arrangements reasonably satisfactory to you and the Company for the purchase of such Securities are not made within 36 hours after such default, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter or the Company. In any such case either you or the Company shall have the right to postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement and in the Prospectus or in any other documents or arrangements may be effected. Any action taken under this paragraph shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

11. If this Agreement shall be terminated by the Underwriters, or any of them, because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement, the Company agrees to reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and expenses of their counsel) reasonably incurred by such Underwriters in connection with this Agreement or the offering of Securities.

12. This Agreement shall inure to the benefit of and be binding upon the Company, the Underwriters, any controlling persons referred to herein and their respective successors and assigns. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any other person, firm or corporation any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained. No purchaser of Securities from any Underwriter shall be deemed to be a successor by reason merely of such purchase.

13. Any action by the Underwriters hereunder may be taken by you jointly on behalf of the Underwriters, and any such action taken by you jointly shall be binding upon the Underwriters. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters shall be given at the addresses set forth in Schedule I hereto. Notices to the Company shall be given to it at Marathon Oil Corporation, 990 Town and Country Boulevard, Houston, Texas 77024-2217; Attention: General Counsel.

14. This Agreement may be signed in counterparts, each of which shall be an original and all of which together shall constitute one and the same instrument. Any electronic signature hereof shall be of the same legal effect, validity or enforceability as a manually executed signature, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act.

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15. In accordance with the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)), the Underwriters are required to obtain, verify and record information that identifies their respective clients, including the Company, which information may include the name and address of their respective clients, as well as other information that will allow the Underwriters to properly identify their respective clients.

16. This Agreement shall be governed by and construed in accordance with the laws of the State of New York, without giving effect to any conflicts of laws provisions thereof that would result in the application of the laws of any other jurisdiction.

17. Notwithstanding and to the exclusion of any other term of this Agreement or any other agreements, arrangements, or understanding between the Company and the Representatives, the Company acknowledges and accepts that a BRRD Liability arising under this Agreement may be subject to the exercise of Bail-in Powers by the Relevant Resolution Authority, and acknowledges, accepts, and agrees to be bound by:

(a) the effect of the exercise of Bail-in Powers by the Relevant Resolution Authority in relation to any BRRD Liability of any Underwriter to the Company under this Agreement, that (without limitation) may include and result in any of the following, or some combination thereof:

(i) the reduction of all, or a portion, of the BRRD Liability or outstanding amounts due thereon;

(ii) the conversion of all, or a portion, of the BRRD Liability into shares, other securities or other obligations of any Underwriter or another person, and the issue to or conferral on the Company of such shares, securities or obligations;

(iii) the cancellation of the BRRD Liability;

(iv) the amendment or alteration of any interest, if applicable, thereon, the maturity or the dates on which any payments are due, including by suspending payment for a temporary period; and

(b) the variation of the terms of this Agreement, as deemed necessary by the Relevant Resolution Authority, to give effect to the exercise of Bail-in Powers by the Relevant Resolution Authority.

For the purposes of this Section 17:

“Bail-in Legislation” means in relation to a member state of the European Economic Area which has implemented, or which at any time implements, the BRRD, the relevant implementing law, regulation, rule or requirement as described in the EU Bail-in Legislation Schedule from time to time;

“Bail-in Powers” means any Write-down and Conversion Powers as defined in the EU Bail-in Legislation Schedule, in relation to the relevant Bail-in Legislation;

“BRRD” means Directive 2014/59/EU establishing a framework for the recovery and resolution of credit institutions and investment firms;

“BRRD Liability” means a liability in respect of which the relevant Write-down and Conversion Powers in the applicable Bail-in Legislation may be exercised; “EU Bail-in Legislation Schedule” means the document described as such, then in effect, and published by the Loan Market Association (or any successor person) from time to time at http://www.lma.eu.com/documents-guidelines/eu-bail-legislation-schedule (or any such successor webpage); and

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“Relevant Resolution Authority” means the resolution authority with the ability to exercise any Bail-in Powers in relation to a particular Underwriter.

18. (a) In the event that any Underwriter that is a Covered Entity becomes subject to a proceeding under a U.S. Special Resolution Regime, the transfer from such Underwriter of this Agreement, and any interest and obligation in or under this Agreement, will be effective to the same extent as the transfer would be effective under the U.S. Special Resolution Regime if this Agreement, and any such interest and obligation, were governed by the laws of the United States or a state of the United States.

(b) In the event that any Underwriter that is a Covered Entity or a BHC Act Affiliate of such Underwriter becomes subject to a proceeding under a U.S. Special Resolution Regime, Default Rights under this Agreement that may be exercised against such Underwriter are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S. Special Resolution Regime if this Agreement were governed by the laws of the United States or a state of the United States.

As used in this Section 18:

“BHC Act Affiliate” has the meaning assigned to the term “affiliate” in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k).

“Covered Entity” means any of the following:

(i) a “covered entity” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 252.82(b);

(ii) a “covered bank” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 47.3(b); or

(iii) a “covered FSI” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 382.2(b).

“Default Right” has the meaning assigned to that term in, and shall be interpreted in accordance with, 12 C.F.R. §§ 252.81, 47.2 or 382.1, as applicable.

“U.S. Special Resolution Regime” means each of (i) the Federal Deposit Insurance Act and the regulations promulgated thereunder and (ii) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder.

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SCHEDULE I

SCHEDULE II

Principal Amount

of Securities Purchased

SCHEDULE III

A. Issuer Free Writing Prospectuses Included in Time of Sale Information

The Pricing Term Sheet, substantially in the form of Schedule IV to the Underwriting Agreement.

SCHEDULE IV

ISSUER FREE WRITING PROSPECTUS

Filed Pursuant to Rule 433

Registration No. 333-269135

Marathon Oil Corporation

$600,000,000 5.300% Senior Notes due 2029

$600,000,000 5.700% Senior Notes due 2034

Pricing Term Sheet

March 26, 2024

This supplement (this “Pricing Term Sheet”) is qualified in its entirety by reference to the preliminary prospectus supplement dated March 26, 2024 (the “Preliminary Prospectus Supplement”) supplementing the base prospectus dated January 5, 2023 (the “Base Prospectus”) included in the registration statement (File No. 333-269135) filed with the Securities and Exchange Commission (the “SEC”). The information in this Pricing Term Sheet supplements the Preliminary Prospectus Supplement and supersedes the information in the Preliminary Prospectus Supplement and Base Prospectus to the extent inconsistent with the information contained therein. Terms used but not defined in the Pricing Term Sheet will have the meanings assigned in the Preliminary Prospectus Supplement.

(1) A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time.

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction.

The issuer has filed a registration statement (including a base prospectus) and a prospectus supplement with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement, the prospectus supplement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC’s website at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the base prospectus and prospectus supplement if you request it by calling J.P. Morgan Securities LLC collect at 1-212-834-4533, Morgan Stanley & Co. LLC at 1-866-718-1649, Mizuho Securities USA LLC toll-free at 1-866-271-7403, MUFG Securities Americas Inc. toll-free at 1-877-649-6848 or SMBC Nikko Securities America, Inc. toll-free at 1-888-868-6856.

Any legends, disclaimers or other notices that may appear below are not applicable to this communication and should be disregarded. Such legends, disclaimers or other notices have been automatically generated as a result of this communication having been sent via Bloomberg or another system.

ANNEX A

Electronic (Netroadshow) investor presentation of the Company made available on March 26, 2024.

Exhibit 4.2

MARATHON OIL CORPORATION

5.300% Senior Notes due 2029

A series of Securities are hereby established pursuant to Section 3.01 of the Indenture dated as of February 26, 2002 between Marathon Oil Corporation (the “Company”) and The Bank of New York Mellon Trust Company, N.A., as successor in interest to JPMorgan Chase Bank (the “Trustee”), relating to senior debt securities of the Company (the “Indenture”) as follows:

Each capitalized term used but not defined herein shall have the meaning assigned to such term in the Indenture.

The title of such series of Securities shall be the “5.300% Senior Notes due 2029” (the “Notes”). The Notes will be offered pursuant to the Indenture. The price to the public at which the Notes shall be issued is 99.813%.

The aggregate principal amount of the Notes that may be initially authenticated and delivered under the Indenture shall be $600,000,000 (except for Notes authenticated and delivered upon registration of transfer of, or in exchange for, or in lieu of, other Notes pursuant to Section 3.04, 3.05, 3.06, 9.06 or 11.07 of the Indenture, and except for any Notes which, pursuant to Section 3.03 of the Indenture, shall be deemed never to have been authenticated and delivered thereunder).

The Company may, without the consent of the Holders, increase such principal amount of the Notes in the future by issuing additional Notes, on the same terms and conditions (except for the issue date, public offering price and, in some cases, first interest payment date) and with the same CUSIP number, as the Notes. If any such additional Notes are not fungible with the Notes for U.S. federal income tax purposes, such additional Notes will be issued with a different CUSIP.

The date on which the principal of the Notes is due and payable, unless accelerated pursuant to the Indenture, is April 1, 2029.

The Notes shall bear interest at the rate of 5.300% per annum. Interest on the Notes shall accrue from the most recent date to which interest has been paid or provided for or, if no interest has been paid or provided for, from March 28, 2024. Interest shall be payable semiannually on April 1 and October 1 of each year (each, an “Interest Payment Date”), commencing October 1, 2024, to each Person in whose name the Notes (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest, except that interest payable at Maturity shall be paid to the same Persons to whom principal of the Notes is payable. The Regular Record Dates for interest payable on the Notes shall be March 15 or September 15 (as the case may be), whether or not a Business Day, immediately preceding an Interest Payment Date. Interest on the Notes shall be calculated on the basis of a 360-day year consisting of twelve 30-day months.

The Notes shall be issued in fully registered form only in denominations of $1,000 and any integral multiple thereof. Subject to any prior conditions stated in the Indenture, the Notes shall be issued in definitive form.

The place or places where (a) the principal of, premium (if any) and interest on the Notes shall be payable, (b) the Notes may be surrendered for registration of transfer or for exchange and (c) notices may be given to the Company in respect of the Notes, is the Corporate Trust Office of the Trustee in New York, New York, or such other offices or agencies maintained for such purposes as the Company may designate from time to time and in accordance with the Indenture; provided that payment of interest,

other than at Maturity, may be made, at the option of the Company, by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or by electronic funds transfer to an account maintained by the Person entitled thereto as such account shall appear in the Security Register.

Prior to the Par Call Date, the Company may redeem the Notes at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 20 basis points less (b) interest accrued thereon to, but not including, the Redemption Date, and (2) 100% of the principal amount of the Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but not including, the Redemption Date.

On or after the Par Call Date, the Company may redeem the Notes at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to, but not including, the Redemption Date.

For purposes of the foregoing discussion of optional redemption, the following definitions are applicable:

“Par Call Date” means March 1, 2029 (the date that is one month prior to the maturity date of the Notes).

“Treasury Rate” means, with respect to any Redemption Date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the Redemption Date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities—Treasury constant maturities—Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the Redemption Date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life—and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the Redemption Date.

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If on the third Business Day preceding the Redemption Date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such Redemption Date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the Redemption Price shall be conclusive and binding for all purposes, absent manifest error.

Notice of the redemption will be sent at least 10 but not more than 60 days prior to the Redemption Date to each Holder of record of the Notes to be redeemed at its registered address. The notice of redemption for the Notes will state, among other things, the series and amount of Notes to be redeemed, the Redemption Date, the Redemption Price (or method of calculation of such Redemption Price if such Redemption Price is not then determinable) and the place or places that payment will be made upon presentation and surrender of such Notes to be redeemed. Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Notes or portions thereof called for redemption. If fewer than all of the Notes are to be redeemed at any time, then, not more than 60 days prior to the Redemption Date, the particular Notes or portions thereof for redemption from the Outstanding Notes not previously called will be selected in accordance with the procedures of The Depository Trust Company (“DTC”).

The calculation or determination of the Redemption Price shall be made by the Company or on the Company’s behalf by such person as the Company shall designate. For the avoidance of doubt, the calculation or determination of the Redemption Price shall not be the obligation or responsibility of the Trustee or Paying Agent.

The Notes are not subject to any sinking fund or analogous provisions. The Notes will not be redeemable at the option of the Holder thereof prior to Maturity.

The Company will not pay additional amounts on any of the Notes to Holders in respect of any tax, assessment or governmental charge withheld or deducted.

The Notes may be purchased only in currency of the United States and payment of principal of, premium, (if any), and interest on the Notes will only be made in currency of the United States.

The Events of Default and covenants specified in the Indenture will apply to the Notes without additions or changes.

One hundred percent (100%) of the principal amount of the Notes will be payable upon declaration of acceleration of the Maturity thereof pursuant to Section 5.02 of the Indenture.

3

The defeasance and covenant defeasance provisions of Article XIII of the Indenture will apply to the Notes.

The satisfaction and discharge provisions of Section 4.01 of the Indenture will apply to the Notes, except that for purposes of the Notes the first paragraph of Section 4.01 of the Indenture shall be amended in its entirety as follows:

“This Indenture shall upon Company Request cease to be of further effect with respect to any (or all) series of Securities (except as to any surviving rights of registration of transfer or exchange of Securities herein expressly provided for), and the Trustee, at the expense of the Company, shall execute proper instruments acknowledging satisfaction and discharge of this Indenture with respect to such Securities, when:

(1) either

(A) all such Securities theretofore authenticated and delivered (other than

(i) Securities which have been destroyed, lost or stolen and which have been replaced or paid as provided in Section 3.06 and

(ii) Securities for whose payment money has theretofore been deposited in trust or segregated and held in trust by the Company and thereafter repaid to the Company or discharged from such trust, as provided in Section 10.03) have been delivered to the Trustee for cancellation; or

(B) all such Securities not theretofore delivered to the Trustee for cancellation

(i) have become due and payable, or

(ii) will become due and payable at their Stated Maturity within one year, or

(iii) are to be called for redemption within one year under arrangements reasonably satisfactory to the Trustee for the giving of notice of redemption by the Trustee in the name, and at the expense, of the Company,

and the Company, in the case of (i), (ii) or (iii) above, has deposited or caused to be deposited with the Trustee as trust funds in trust for such purpose, (a) money in an amount (in U.S. dollars), (b) U.S. Government Obligations (as defined in Section 13.04 below), which through the scheduled payment of principal and interest in respect thereof in accordance with their terms will provide, not later than one day before the due date of any payment, money in an amount (in U.S. dollars), or (c) a combination thereof, in each case sufficient (in the case of clauses (b) or (c)) in the opinion of a nationally recognized firm of independent public accountants expressed in a written certification thereof delivered to the Trustee, to pay and discharge the entire indebtedness on such Securities not theretofore delivered to the Trustee for cancellation, for principal and any premium, if any, and interest to the date of such deposit (in the case of Securities which have become due and payable) or to the Stated Maturity or Redemption Date, as the case may be;

4

(2) the Company has paid or caused to be paid all other sums payable hereunder by the Company; and

(3) the Company has delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that all conditions precedent herein provided for relating to the satisfaction and discharge of this Indenture with respect to such Securities have been complied with.”

Section 4.02 of the Indenture shall be amended in its entirety as follows:

“Subject to the provisions of the last paragraph of Section 10.03, all money and U.S. Government Obligations (including the proceeds thereof) deposited with the Trustee pursuant to Section 4.01 shall be held in trust and applied by the Trustee, in accordance with the provisions of the Securities and this Indenture, to the payment, either directly or through any Paying Agent (including the Company acting as its own Paying Agent) as the Trustee may determine, to the Persons entitled thereto, of the principal and any premium and interest for whose payment such money has been deposited with the Trustee.”

For purposes of the Notes, the last paragraph of Section 10.05 of the Indenture shall be amended in its entirety as follows:

“Notwithstanding the foregoing restriction contained in this Section 10.05, the Company may and may permit its Subsidiaries to incur liens or grant Mortgages on property covered by the restriction above so long as the net book value of the property so encumbered, together with all property subject to the restriction on sale and leasebacks contained in Section 10.06, does not, at the time such lien or Mortgage is granted, exceed the greater of (i) fifteen percent (15%) of Consolidated Net Tangible Assets and (ii) $3,000,000,000 (three billion dollars).”

The Notes shall be issued in the form of one or more Global Securities (the “Global Notes”). The Depository for the Global Notes shall be DTC, and the Global Notes shall be registered in the name of Cede & Co., as a nominee of DTC, or such other name as may be requested by an authorized representative of DTC. Except as set forth in Sections 2.03 or 3.05 of the Indenture, such Global Notes may only be transferred, in whole and not in part, by DTC to a nominee of DTC or by a nominee of DTC to DTC or another nominee of DTC or by DTC or any nominee to a successor of DTC or a nominee of such successor.

The Trustee will initially act as the Security Registrar for the Notes and as the Paying Agent with respect to the Notes.

The Notes and the Trustee’s certificate of authentication shall be substantially in the form of Exhibit 1 hereto.

5

EXHIBIT 1

[Form of Note]

MARATHON OIL CORPORATION

5.300% Senior Notes due 2029

CUSIP No. [ ]

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR NOMINEE THEREOF. THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

MARATHON OIL CORPORATION, a corporation duly organized and existing under the laws of the State of Delaware (herein called the “Company,” which term includes any successor Person under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of [ ] Dollars ($[ ]) on April 1, 2029 and to pay interest thereon from March 28, 2024 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually on April 1 and October 1 in each year commencing October 1, 2024, at the rate of 5.300% per annum, until the principal hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest, except that interest payable at Maturity shall be paid to the same Persons to whom principal of the Notes is payable. The Regular Record Dates for interest payable on the Notes shall be March 15 and September 15 (whether or not a Business Day), as the case may be, immediately preceding such Interest Payment Date. Any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange all as more fully provided in said Indenture.

Payment of the principal of (and premium, if any) and interest on this Security will be made at the office or agency of the Company maintained for that purpose in New York, New York, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or by electronic funds transfer to an account maintained by the Person entitled thereto as specified in the Security Register, provided that such Person shall have given the Trustee written instructions.

Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

Dated:      

[Signature Page to Form of Global Note]

CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated:      

[Signature Page to Form of Global Note]

MARATHON OIL CORPORATION

5.300% SENIOR NOTES DUE 2029

This Security is one of a duly authorized issue of securities of the Company (herein called the “Securities”), issued and to be issued under an Indenture, dated as of February 26, 2002 (herein called the “Indenture,” which term shall have the meaning assigned to it in such instrument), between the Company and The Bank of New York Mellon Trust Company, N.A., as successor in interest to JPMorgan Chase Bank, as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), and reference is hereby made to the Indenture for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the series designated on the face hereof initially limited in aggregate principal amount to $600,000,000.

The Company may, without the consent of the Holders, increase such principal amount of the Securities of this series in the future by issuing additional Securities, on the same terms and conditions (except for the issue date, public offering price and, in some cases, first interest payment date) and with the same CUSIP number, as the Securities of this series. If any such additional Securities are not fungible with the Securities of this series for U.S. federal income tax purposes, such additional Securities will be issued with a different CUSIP.

Prior to the Par Call Date, the Company may redeem the Securities of this series at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Securities of such series matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 20 basis points less (b) interest accrued thereon to, but not including, the Redemption Date, and (2) 100% of the principal amount of the Securities to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but not including, the Redemption Date.

On or after the Par Call Date, the Company may redeem the Securities of this series at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Securities of this series being redeemed plus accrued and unpaid interest thereon to, but not including, the Redemption Date.

For purposes of the foregoing discussion of optional redemption, the following definitions are applicable:

“Par Call Date” means March 1, 2029 (the date that is one month prior to the Stated Maturity of the Securities).

“Treasury Rate” means, with respect to any Redemption Date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the Redemption Date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated

as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities—Treasury constant maturities—Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the Redemption Date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life—and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the Redemption Date.

If on the third Business Day preceding the Redemption Date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such Redemption Date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the Redemption Price shall be conclusive and binding for all purposes, absent manifest error.

Notice of the redemption will be sent at least 10 but not more than 60 days prior to the Redemption Date to each Holder of record of the Securities of this series to be redeemed at its registered address. The notice of redemption for the Securities of this series will state, among other things, the series and amount of such Securities to be redeemed, the Redemption Date, the Redemption Price (or method of calculation of such Redemption Price if such Redemption Price is not then determinable) and the place or places that payment will be made upon presentation and surrender of such Securities of this series to be redeemed. Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Securities of this series or portions thereof called for redemption. If fewer than all of the Securities of this series are to be redeemed at any time, then, not more than 60 days prior to the Redemption Date, the particular Securities or portions thereof for redemption from the outstanding Securities of this series not previously called will be selected in accordance with the procedures of DTC.

The calculation or determination of the Redemption Price shall be made by the Company or on the Company’s behalf by such person as the Company shall designate. For the avoidance of doubt, the calculation or determination of the Redemption Price shall not be the obligation or responsibility of the Trustee or Paying Agent.

Unless the Company defaults in payment of the Redemption Price, on or after the Redemption Date, interest will cease to accrue on the Securities of this series or portions thereof called for redemption.

In the event of redemption of this Security in part only, a new Security or Securities of this series and of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof.

The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Security or of certain restrictive covenants and Events of Default with respect to this Security, in each case upon compliance with certain conditions set forth in the Indenture.

If an Event of Default with respect to Securities of this series shall occur and be continuing, the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided for in the Indenture. The Indenture contains provisions permitting the Company and the Trustee to modify the Indenture or any supplemental indenture without the consent of the Holders for one or more of the following purposes: (1) to evidence the succession of another corporation to the Company; (2) to add to the covenants of the Company; (3) to add additional events of default for the benefit of Holders of all or any series of Securities; (4) to add to or change provisions of the Indenture to allow the issuance of Securities in other forms; (5) to add to, change or eliminate any of the provisions of the Indenture in respect of one or more series of Securities thereunder, under certain conditions specified therein; (6) to secure the Securities pursuant to the requirements of Section 10.05 of the Indenture or otherwise; (7) to establish the form or terms of Securities of any series as permitted by Sections 2.01 and 3.01 of the Indenture; (8) to evidence the appointment of a successor Trustee; and (9) to cure any ambiguity, to correct or supplement any provision of the Indenture which may be defective or inconsistent with any other provision of the Indenture, or to make any other provisions with respect to matters or questions arising under the Indenture as shall not adversely affect the interests of the Holders in any material respect.

The Indenture also permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

As provided in and subject to the provisions of the Indenture, the Holder of this Security shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or trustee or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Securities of this series, the Holders of not less than 25% in principal amount of the Securities of this series at the time Outstanding shall have made written request to the Trustee to institute proceedings in respect of such Event of Default

as Trustee and offered the Trustee reasonable indemnity, and the Trustee shall not have received from the Holders of a majority in principal amount of Securities of this series at the time Outstanding a direction inconsistent with such request, and shall have failed to institute any such proceeding, for 60 days after receipt of such notice, request and offer of indemnity. The foregoing shall not apply to any suit instituted by the Holder of this Security for the enforcement of any payment of principal hereof or any premium or interest hereon on or after the respective due dates expressed herein.

No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and any premium and interest on this Security at the times, place and rate, and in the coin or currency, herein described.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

The Securities of this series are issuable only in registered form without coupons in denominations of $1,000 and any integral multiple thereof. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

FORM OF ASSIGNMENT

ABBREVIATIONS

Customary abbreviations may be used in the name of a Securityholder or an assignee, such as TEN COM (=tenants in common), TEN ENT (=tenants by the entireties), JT TEN (=joint tenants with rights of survivorship and not as tenants in common), CUST (=custodian), and U/G/M/A (=Uniform Gift to Minors Act).

Additional abbreviations may also be used though not in the above list.

FOR VALUE RECEIVED, the undersigned hereby sell(s),

assign(s) and transfer(s) unto

Please insert Social Security or

other identifying number of assignee

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE

the within Security and all rights thereunder, hereby irrevocably constituting and appointing attorney to transfer said Security on the books of the Company, with full power of substitution in the premises.

Dated: ___________________________

Notice: This signature to the assignment must correspond with the name as written on the face of the within instrument in every particular, without alteration or enlargement, or any change whatever.

SCHEDULE OF INCREASES OR DECREASES IN THE PRINCIPAL AMOUNT OF SECURITIES

The original principal amount of this Security is [ ] U.S. Dollars ($[ ]). The following increases or decreases in the principal amount of this Security have been made:

Exhibit 4.3

MARATHON OIL CORPORATION

5.700% Senior Notes due 2034

A series of Securities are hereby established pursuant to Section 3.01 of the Indenture dated as of February 26, 2002 between Marathon Oil Corporation (the “Company”) and The Bank of New York Mellon Trust Company, N.A., as successor in interest to JPMorgan Chase Bank (the “Trustee”), relating to senior debt securities of the Company (the “Indenture”) as follows:

Each capitalized term used but not defined herein shall have the meaning assigned to such term in the Indenture.

The title of such series of Securities shall be the “5.700% Senior Notes due 2034” (the “Notes”). The Notes will be offered pursuant to the Indenture. The price to the public at which the Notes shall be issued is 99.969%.

The aggregate principal amount of the Notes that may be initially authenticated and delivered under the Indenture shall be $600,000,000 (except for Notes authenticated and delivered upon registration of transfer of, or in exchange for, or in lieu of, other Notes pursuant to Section 3.04, 3.05, 3.06, 9.06 or 11.07 of the Indenture, and except for any Notes which, pursuant to Section 3.03 of the Indenture, shall be deemed never to have been authenticated and delivered thereunder).

The Company may, without the consent of the Holders, increase such principal amount of the Notes in the future by issuing additional Notes, on the same terms and conditions (except for the issue date, public offering price and, in some cases, first interest payment date) and with the same CUSIP number, as the Notes. If any such additional Notes are not fungible with the Notes for U.S. federal income tax purposes, such additional Notes will be issued with a different CUSIP.

The date on which the principal of the Notes is due and payable, unless accelerated pursuant to the Indenture, is April 1, 2034.

The Notes shall bear interest at the rate of 5.700% per annum. Interest on the Notes shall accrue from the most recent date to which interest has been paid or provided for or, if no interest has been paid or provided for, from March 28, 2024. Interest shall be payable semiannually on April 1 and October 1 of each year (each, an “Interest Payment Date”), commencing October 1, 2024, to each Person in whose name the Notes (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest, except that interest payable at Maturity shall be paid to the same Persons to whom principal of the Notes is payable. The Regular Record Dates for interest payable on the Notes shall be March 15 or September 15 (as the case may be), whether or not a Business Day, immediately preceding an Interest Payment Date. Interest on the Notes shall be calculated on the basis of a 360-day year consisting of twelve 30-day months.

The Notes shall be issued in fully registered form only in denominations of $1,000 and any integral multiple thereof. Subject to any prior conditions stated in the Indenture, the Notes shall be issued in definitive form.

The place or places where (a) the principal of, premium (if any) and interest on the Notes shall be payable, (b) the Notes may be surrendered for registration of transfer or for exchange and (c) notices may be given to the Company in respect of the Notes, is the Corporate Trust Office of the Trustee in New York, New York, or such other offices or agencies maintained for such purposes as the Company may designate from time to time and in accordance with the Indenture; provided that payment of interest,

other than at Maturity, may be made, at the option of the Company, by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or by electronic funds transfer to an account maintained by the Person entitled thereto as such account shall appear in the Security Register.

Prior to the Par Call Date, the Company may redeem the Notes at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 25 basis points less (b) interest accrued thereon to, but not including, the Redemption Date, and (2) 100% of the principal amount of the Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but not including, the Redemption Date.

On or after the Par Call Date, the Company may redeem the Notes at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to, but not including, the Redemption Date.

For purposes of the foregoing discussion of optional redemption, the following definitions are applicable:

“Par Call Date” means January 1, 2034 (the date that is three months prior to the maturity date of the Notes).

“Treasury Rate” means, with respect to any Redemption Date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the Redemption Date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities—Treasury constant maturities—Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the Redemption Date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life—and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the Redemption Date.

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If on the third Business Day preceding the Redemption Date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such Redemption Date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the Redemption Price shall be conclusive and binding for all purposes, absent manifest error.

Notice of the redemption will be sent at least 10 but not more than 60 days prior to the Redemption Date to each Holder of record of the Notes to be redeemed at its registered address. The notice of redemption for the Notes will state, among other things, the series and amount of Notes to be redeemed, the Redemption Date, the Redemption Price (or method of calculation of such Redemption Price if such Redemption Price is not then determinable) and the place or places that payment will be made upon presentation and surrender of such Notes to be redeemed. Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Notes or portions thereof called for redemption. If fewer than all of the Notes are to be redeemed at any time, then, not more than 60 days prior to the Redemption Date, the particular Notes or portions thereof for redemption from the Outstanding Notes not previously called will be selected in accordance with the procedures of The Depository Trust Company (“DTC”).

The calculation or determination of the Redemption Price shall be made by the Company or on the Company’s behalf by such person as the Company shall designate. For the avoidance of doubt, the calculation or determination of the Redemption Price shall not be the obligation or responsibility of the Trustee or Paying Agent.

The Notes are not subject to any sinking fund or analogous provisions. The Notes will not be redeemable at the option of the Holder thereof prior to Maturity.

The Company will not pay additional amounts on any of the Notes to Holders in respect of any tax, assessment or governmental charge withheld or deducted.

The Notes may be purchased only in currency of the United States and payment of principal of, premium, (if any), and interest on the Notes will only be made in currency of the United States.

The Events of Default and covenants specified in the Indenture will apply to the Notes without additions or changes.

One hundred percent (100%) of the principal amount of the Notes will be payable upon declaration of acceleration of the Maturity thereof pursuant to Section 5.02 of the Indenture.

3

The defeasance and covenant defeasance provisions of Article XIII of the Indenture will apply to the Notes.

The satisfaction and discharge provisions of Section 4.01 of the Indenture will apply to the Notes, except that for purposes of the Notes the first paragraph of Section 4.01 of the Indenture shall be amended in its entirety as follows:

“This Indenture shall upon Company Request cease to be of further effect with respect to any (or all) series of Securities (except as to any surviving rights of registration of transfer or exchange of Securities herein expressly provided for), and the Trustee, at the expense of the Company, shall execute proper instruments acknowledging satisfaction and discharge of this Indenture with respect to such Securities, when:

(1) either

(A) all such Securities theretofore authenticated and delivered (other than

(i) Securities which have been destroyed, lost or stolen and which have been replaced or paid as provided in Section 3.06 and

(ii) Securities for whose payment money has theretofore been deposited in trust or segregated and held in trust by the Company and thereafter repaid to the Company or discharged from such trust, as provided in Section 10.03) have been delivered to the Trustee for cancellation; or

(B) all such Securities not theretofore delivered to the Trustee for cancellation

(i) have become due and payable, or

(ii) will become due and payable at their Stated Maturity within one year, or

(iii) are to be called for redemption within one year under arrangements reasonably satisfactory to the Trustee for the giving of notice of redemption by the Trustee in the name, and at the expense, of the Company,

and the Company, in the case of (i), (ii) or (iii) above, has deposited or caused to be deposited with the Trustee as trust funds in trust for such purpose, (a) money in an amount (in U.S. dollars), (b) U.S. Government Obligations (as defined in Section 13.04 below), which through the scheduled payment of principal and interest in respect thereof in accordance with their terms will provide, not later than one day before the due date of any payment, money in an amount (in U.S. dollars), or (c) a combination thereof, in each case sufficient (in the case of clauses (b) or (c)) in the opinion of a nationally recognized firm of independent public accountants expressed in a written certification thereof delivered to the Trustee, to pay and discharge the entire indebtedness on such Securities not theretofore delivered to the Trustee for cancellation, for principal and any premium, if any, and interest to the date of such deposit (in the case of Securities which have become due and payable) or to the Stated Maturity or Redemption Date, as the case may be;

4

(2) the Company has paid or caused to be paid all other sums payable hereunder by the Company; and

(3) the Company has delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that all conditions precedent herein provided for relating to the satisfaction and discharge of this Indenture with respect to such Securities have been complied with.”

Section 4.02 of the Indenture shall be amended in its entirety as follows:

“Subject to the provisions of the last paragraph of Section 10.03, all money and U.S. Government Obligations (including the proceeds thereof) deposited with the Trustee pursuant to Section 4.01 shall be held in trust and applied by the Trustee, in accordance with the provisions of the Securities and this Indenture, to the payment, either directly or through any Paying Agent (including the Company acting as its own Paying Agent) as the Trustee may determine, to the Persons entitled thereto, of the principal and any premium and interest for whose payment such money has been deposited with the Trustee.”

For purposes of the Notes, the last paragraph of Section 10.05 of the Indenture shall be amended in its entirety as follows:

“Notwithstanding the foregoing restriction contained in this Section 10.05, the Company may and may permit its Subsidiaries to incur liens or grant Mortgages on property covered by the restriction above so long as the net book value of the property so encumbered, together with all property subject to the restriction on sale and leasebacks contained in Section 10.06, does not, at the time such lien or Mortgage is granted, exceed the greater of (i) fifteen percent (15%) of Consolidated Net Tangible Assets and (ii) $3,000,000,000 (three billion dollars).”

The Notes shall be issued in the form of one or more Global Securities (the “Global Notes”). The Depository for the Global Notes shall be DTC, and the Global Notes shall be registered in the name of Cede & Co., as a nominee of DTC, or such other name as may be requested by an authorized representative of DTC. Except as set forth in Sections 2.03 or 3.05 of the Indenture, such Global Notes may only be transferred, in whole and not in part, by DTC to a nominee of DTC or by a nominee of DTC to DTC or another nominee of DTC or by DTC or any nominee to a successor of DTC or a nominee of such successor.

The Trustee will initially act as the Security Registrar for the Notes and as the Paying Agent with respect to the Notes.

The Notes and the Trustee’s certificate of authentication shall be substantially in the form of Exhibit 1 hereto.

5

EXHIBIT 1

[Form of Note]

MARATHON OIL CORPORATION

5.700% Senior Notes due 2034

CUSIP No. [ ]

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR NOMINEE THEREOF. THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

MARATHON OIL CORPORATION, a corporation duly organized and existing under the laws of the State of Delaware (herein called the “Company,” which term includes any successor Person under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of [ ] Dollars ($[ ]) on April 1, 2034 and to pay interest thereon from March 28, 2024 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually on April 1 and October 1 in each year commencing October 1, 2024, at the rate of 5.700% per annum, until the principal hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest, except that interest payable at Maturity shall be paid to the same Persons to whom principal of the Notes is payable. The Regular Record Dates for interest payable on the Notes shall be March 15 and September 15 (whether or not a Business Day), as the case may be, immediately preceding such Interest Payment Date. Any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange all as more fully provided in said Indenture.

Payment of the principal of (and premium, if any) and interest on this Security will be made at the office or agency of the Company maintained for that purpose in New York, New York, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or by electronic funds transfer to an account maintained by the Person entitled thereto as specified in the Security Register, provided that such Person shall have given the Trustee written instructions.

Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

Dated:

[Signature Page to Form of Global Note]

CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated:

[Signature Page to Form of Global Note]

MARATHON OIL CORPORATION

5.700% SENIOR NOTES DUE 2034

This Security is one of a duly authorized issue of securities of the Company (herein called the “Securities”), issued and to be issued under an Indenture, dated as of February 26, 2002 (herein called the “Indenture,” which term shall have the meaning assigned to it in such instrument), between the Company and The Bank of New York Mellon Trust Company, N.A., as successor in interest to JPMorgan Chase Bank, as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), and reference is hereby made to the Indenture for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the series designated on the face hereof initially limited in aggregate principal amount to $600,000,000.

The Company may, without the consent of the Holders, increase such principal amount of the Securities of this series in the future by issuing additional Securities, on the same terms and conditions (except for the issue date, public offering price and, in some cases, first interest payment date) and with the same CUSIP number, as the Securities of this series. If any such additional Securities are not fungible with the Securities of this series for U.S. federal income tax purposes, such additional Securities will be issued with a different CUSIP.

Prior to the Par Call Date, the Company may redeem the Securities of this series at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Securities of such series matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 25 basis points less (b) interest accrued thereon to, but not including, the Redemption Date, and (2) 100% of the principal amount of the Securities to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but not including, the Redemption Date.

On or after the Par Call Date, the Company may redeem the Securities of this series at the Company’s option, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Securities of this series being redeemed plus accrued and unpaid interest thereon to, but not including, the Redemption Date.

For purposes of the foregoing discussion of optional redemption, the following definitions are applicable:

“Par Call Date” means January 1, 2034 (the date that is three months prior to the Stated Maturity of the Securities).

“Treasury Rate” means, with respect to any Redemption Date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the Redemption Date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated

as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities—Treasury constant maturities—Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the Redemption Date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life—and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the Redemption Date.

If on the third Business Day preceding the Redemption Date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such Redemption Date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the Redemption Price shall be conclusive and binding for all purposes, absent manifest error.

Notice of the redemption will be sent at least 10 but not more than 60 days prior to the Redemption Date to each Holder of record of the Securities of this series to be redeemed at its registered address. The notice of redemption for the Securities of this series will state, among other things, the series and amount of such Securities to be redeemed, the Redemption Date, the Redemption Price (or method of calculation of such Redemption Price if such Redemption Price is not then determinable) and the place or places that payment will be made upon presentation and surrender of such Securities of this series to be redeemed. Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Securities of this series or portions thereof called for redemption. If fewer than all of the Securities of this series are to be redeemed at any time, then, not more than 60 days prior to the Redemption Date, the particular Securities or portions thereof for redemption from the outstanding Securities of this series not previously called will be selected in accordance with the procedures of DTC.

The calculation or determination of the Redemption Price shall be made by the Company or on the Company’s behalf by such person as the Company shall designate. For the avoidance of doubt, the calculation or determination of the Redemption Price shall not be the obligation or responsibility of the Trustee or Paying Agent.

Unless the Company defaults in payment of the Redemption Price, on or after the Redemption Date, interest will cease to accrue on the Securities of this series or portions thereof called for redemption.

In the event of redemption of this Security in part only, a new Security or Securities of this series and of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof.

The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Security or of certain restrictive covenants and Events of Default with respect to this Security, in each case upon compliance with certain conditions set forth in the Indenture.

If an Event of Default with respect to Securities of this series shall occur and be continuing, the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided for in the Indenture. The Indenture contains provisions permitting the Company and the Trustee to modify the Indenture or any supplemental indenture without the consent of the Holders for one or more of the following purposes: (1) to evidence the succession of another corporation to the Company; (2) to add to the covenants of the Company; (3) to add additional events of default for the benefit of Holders of all or any series of Securities; (4) to add to or change provisions of the Indenture to allow the issuance of Securities in other forms; (5) to add to, change or eliminate any of the provisions of the Indenture in respect of one or more series of Securities thereunder, under certain conditions specified therein; (6) to secure the Securities pursuant to the requirements of Section 10.05 of the Indenture or otherwise; (7) to establish the form or terms of Securities of any series as permitted by Sections 2.01 and 3.01 of the Indenture; (8) to evidence the appointment of a successor Trustee; and (9) to cure any ambiguity, to correct or supplement any provision of the Indenture which may be defective or inconsistent with any other provision of the Indenture, or to make any other provisions with respect to matters or questions arising under the Indenture as shall not adversely affect the interests of the Holders in any material respect.

The Indenture also permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

As provided in and subject to the provisions of the Indenture, the Holder of this Security shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or trustee or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Securities of this series, the Holders of not less than 25% in principal amount of the Securities of this series at the time Outstanding shall have made written request to the Trustee to institute proceedings in respect of such Event of Default

as Trustee and offered the Trustee reasonable indemnity, and the Trustee shall not have received from the Holders of a majority in principal amount of Securities of this series at the time Outstanding a direction inconsistent with such request, and shall have failed to institute any such proceeding, for 60 days after receipt of such notice, request and offer of indemnity. The foregoing shall not apply to any suit instituted by the Holder of this Security for the enforcement of any payment of principal hereof or any premium or interest hereon on or after the respective due dates expressed herein.

No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and any premium and interest on this Security at the times, place and rate, and in the coin or currency, herein described.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

The Securities of this series are issuable only in registered form without coupons in denominations of $1,000 and any integral multiple thereof. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

FORM OF ASSIGNMENT

ABBREVIATIONS

Customary abbreviations may be used in the name of a Securityholder or an assignee, such as TEN COM (=tenants in common), TEN ENT (=tenants by the entireties), JT TEN (=joint tenants with rights of survivorship and not as tenants in common), CUST (=custodian), and U/G/M/A (=Uniform Gift to Minors Act).

Additional abbreviations may also be used though not in the above list.

FOR VALUE RECEIVED, the undersigned hereby sell(s),

assign(s) and transfer(s) unto

Please insert Social Security or

other identifying number of assignee

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE

the within Security and all rights thereunder, hereby irrevocably constituting and appointing attorney to transfer said Security on the books of the Company, with full power of substitution in the premises.

Dated: ___________________________

Notice: This signature to the assignment must correspond with the name as written on the face of the within instrument in every particular, without alteration or enlargement, or any change whatever.

SCHEDULE OF INCREASES OR DECREASES IN THE PRINCIPAL AMOUNT OF SECURITIES

The original principal amount of this Security is [ ] U.S. Dollars ($[ ]). The following increases or decreases in the principal amount of this Security have been made:

Exhibit 5.1

March 28, 2024

Marathon Oil Corporation

990 Town and Country Boulevard

Houston, Texas 77024-2217

5.300% Senior Notes due 2029 and 5.700% Senior Notes due 2034

Ladies and Gentlemen:

We have acted as special legal counsel to Marathon Oil Corporation, a Delaware corporation (the “Company”), in connection with the issuance and sale of $600,000,000 in aggregate principal amount of the Company’s 5.300% Senior Notes due 2029 (the “2029 Notes”), and $600,000,000 in aggregate principal amount of the Company’s 5.700% Senior Notes due 2034 (the “2034 Notes” and, together with the 2029 Notes, the “Notes”), which were sold pursuant to the Underwriting Agreement, dated March 26, 2024 (the “Underwriting Agreement”), among the Company, J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, Mizuho Securities USA LLC, MUFG Securities Americas Inc. and SMBC Nikko Securities America, Inc., as representatives of the several underwriters named in Schedule II thereto.

The Notes have been offered for sale pursuant to a prospectus supplement, dated March 26, 2024, filed with the Securities and Exchange Commission (the “Commission”) pursuant to Rule 424(b) on March 27, 2024, to the prospectus, dated January 5, 2023 (as amended and supplemented by the prospectus supplement, the “Prospectus”), that constitutes a part of the Company’s Registration Statement on Form S-3 (Registration No. 333-269135), filed with the Commission on January 5, 2023 (the “Registration Statement”), which Registration Statement became effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act of 1933, as amended (the “Securities Act”).

The Notes have been issued pursuant to an Indenture, dated as of February 26, 2002 (the “Base Indenture”), between the Company and The Bank of New York Mellon Trust Company, N.A., successor in interest to JPMorgan Chase Bank, as trustee (the “Trustee”), as supplemented by the terms of the 2029 Notes and 2034 Notes contained in that certain officers’ certificate of the Executive Vice President and Chief Financial Officer and Vice President and Treasurer of the Company, dated the date hereof (the “Officers’ Certificate” and, together with the Base Indenture, the “Indenture”).

Austin Bay Area Beijing Boston Brussels Chicago Dallas Hong Kong London Los Angeles Munich New York  Paris Riyadh Salt Lake City Shanghai Washington, D.C.

March 28, 2024

Page 2

In rendering this opinion letter, we have reviewed originals or copies, certified or otherwise identified to our satisfaction, of the Company’s corporate records, the Registration Statement, the Prospectus, the Indenture and such other certificates, instruments and documents as we considered appropriate for purposes of the opinion hereafter expressed. In addition, we reviewed such questions of law as we considered appropriate.

As to any facts material to the opinion contained herein, we have made no independent investigation of such facts and have relied, to the extent that we deem such reliance proper, upon certificates of public officials and officers or other representatives of the Company.

In connection with rendering the opinion set forth below, we have assumed that (i) all information contained in all documents we reviewed is true, correct and complete, (ii) all signatures on all documents we reviewed are genuine, (iii) all documents submitted to us as originals are true and complete, (iv) all documents submitted to us as copies are true and complete copies of the originals thereof, (v) all persons executing and delivering the documents we examined were competent to execute and deliver such documents, (vi) all Notes will be issued and sold in compliance with applicable federal and state securities laws and in the manner stated in the Prospectus and the Registration Statement, (vii) the Underwriting Agreement has been duly authorized and validly executed and delivered by the parties thereto, (viii) the Indenture was duly authorized, executed, and delivered by the parties thereto, and (ix) the Trustee is qualified to act as trustee under the Indenture.

Based upon such examination and review and the assumptions, qualifications, limitations and exceptions set forth herein, we are of the opinion that the Notes, when authenticated by the Trustee in the manner provided in the Indenture and issued and delivered against payment of the purchase price therefor, will be binding obligations of the Company.

The foregoing opinion is qualified to the extent that the enforceability of any document, instrument or security may be limited by or subject to (i) bankruptcy, insolvency, fraudulent transfer or conveyance, reorganization, moratorium or other similar laws relating to or affecting creditors’ rights generally; (ii) an implied covenant of good faith and fair dealing; and (iii) general equitable or public policy principles. In addition, we express no opinion with respect to (x) the enforceability of provisions in the Indenture or any other agreement or instrument with respect to delay or omission of enforcement of rights or remedies, or waivers of defenses, or waivers of benefits of stay, extension, moratorium, redemption, statutes of limitation, or other nonwaivable benefits bestowed by operation of law; or (y) the enforceability of indemnification or contribution provisions to the extent they purport to relate to liabilities resulting from or based upon negligence or any violation of federal or state securities or blue sky laws.

March 28, 2024

Page 3

This opinion letter is limited in all respects to the internal laws of the State of New York, the General Corporation Law of the State of Delaware and the federal laws of the United States of America, and we do not express any opinion as to the laws of any other jurisdiction.

This opinion letter speaks as of the time of its delivery on the date it bears. We do not assume any obligation to provide you with any subsequent opinion or advice by reason of any fact about which we did not have knowledge at that time, by reason of any change subsequent to that time in any law covered by our opinion or for any other reason.

We consent to the filing of this opinion letter as an exhibit to the Company’s Current Report on Form 8-K to be filed on the date hereof. In giving this consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission.

Exhibit 99.1

Marathon Oil Corporation Announces Pricing of Offering of $600 Million of Senior Notes Due 2029 and $600 Million of Senior Notes Due 2034

HOUSTON, March 26, 2024 - Marathon Oil Corporation (NYSE: MRO) (the “Company”) announced today that it has priced an offering of senior notes in an aggregate amount of $1.2 billion, consisting of $600 million principal amount of its 5.300% Senior Notes due 2029 and $600 million principal amount of its 5.700% Senior Notes due 2034.

The Company intends to use the net proceeds from the offering, together with cash on hand, to fund the repayment in full of outstanding borrowings under the Company’s term loan facility. The offering is expected to close on March 28, 2024, subject to customary closing conditions.

J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, Mizuho Securities USA LLC, MUFG Securities Americas Inc. and SMBC Nikko Securities America, Inc. are acting as Joint Book-Running Managers for the offering.

The Company has filed a registration statement (including a base prospectus) and a prospectus supplement with the Securities and Exchange Commission (the “SEC”) for the offering to which this communication relates. Before investing, investors should read the prospectus in that registration statement, the prospectus supplement and other documents the Company has filed with the SEC for more complete information about the Company and this offering. These documents may be accessed for free by visiting EDGAR on the SEC’s website at www.sec.gov or by calling J.P. Morgan Securities LLC collect at 1-212-834-4533, Morgan Stanley & Co. LLC at 1-866-718-1649, Mizuho Securities USA LLC toll-free at 1-866-271-7403, MUFG Securities Americas Inc. toll-free at 1-877-649-6848 or SMBC Nikko Securities America, Inc. toll-free at 1-888-868-6856.

This news release shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of any securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Marathon Oil

Marathon Oil Corporation (NYSE: MRO) is an independent oil and gas exploration and production (E&P) company focused on four of the most competitive resource plays in the U.S.—Eagle Ford, Texas; Bakken, North Dakota; STACK and SCOOP in Oklahoma; and Permian in New Mexico and Texas, complemented by a world-class integrated gas business in Equatorial Guinea. The Company’s Framework for Success is founded on a strong balance sheet, ESG excellence and the competitive advantages of a multi-basin portfolio.

Forward-Looking Statements

This release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements, other than statements of historical fact, including, without limitation, statements regarding the Company’s plans and expected timing with respect to the offering and the Company’s repayment of outstanding borrowings under its term loan facility, are forward-looking statements. Words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “future,” “guidance,” “intend,” “may,” “outlook,” “plan,” “positioned,” “project,” “seek,” “should,” “target,” “will,” “would,” or similar words may be used to identify forward-looking statements; however, the absence of these words does not mean that the statements are not forward-looking. While the Company believes its assumptions concerning future events are reasonable, these expectations may not prove to be correct. A number of factors could cause actual results to differ materially from those projected, including, but not limited to: conditions in the oil and gas industry, including supply/demand levels for crude oil and condensate, natural gas liquids and natural gas and the resulting impact on price; changes in expected reserve or production levels; changes in political or economic conditions in the U.S. and Equatorial Guinea, including changes in foreign currency exchange rates, interest rates, inflation rates and global and domestic market conditions; actions taken by the members of the Organization of the Petroleum Exporting Countries (OPEC) and Russia affecting the production and pricing of crude oil and other global and domestic political, economic or diplomatic developments; capital available for exploration and development; risks related to the Company’s hedging activities; voluntary or involuntary curtailments, delays or cancellations of certain drilling activities; well production timing; liabilities or corrective actions resulting from litigation, other proceedings and investigations or alleged violations of law or permits; drilling and operating risks; lack of, or disruption in, access to storage capacity, pipelines or other transportation methods; availability of drilling rigs, materials and labor, including the costs associated therewith; difficulty in obtaining necessary approvals and permits; the availability, cost, terms and timing of issuance or execution of, competition for, and challenges to, mineral licenses and leases and governmental and other permits and rights-of-way, and our ability to retain mineral licenses and leases; non-performance by third parties of contractual or legal obligations, including due to bankruptcy; administrative impediments or unexpected events that may impact dividends or other distributions, and the timing thereof, from our equity method investees; changes in our credit ratings; hazards such as weather conditions, a health pandemic, acts of war or terrorist acts and the governmental or military response thereto; shortages of key personnel, including employees, contractors and subcontractors; the impacts of supply chain disruptions that began during the COVID-19 pandemic and the resulting inflationary environment; security threats, including cybersecurity threats and disruptions to our business and operations from breaches of our information technology systems, or breaches of the information technology systems, facilities and infrastructure of third parties with which we transact business; changes in safety, health, environmental, tax, currency and other regulations, requirements or initiatives, including those addressing the impact of global climate change, air emissions or water management; our ability to achieve, reach or otherwise meet initiatives, plans, or ambitions with respect to environmental, safety and governance matters; our ability to pay dividends and make share repurchases; our ability to secure increased exposure to global LNG market prices and progress on the Equatorial Guinea Gas Mega Hub; impacts of the Inflation Reduction Act of 2022 and our assumptions relating thereto; the risk that assets we acquire do not perform consistent with our expectations, including with respect to future production or drilling inventory; other geological, operating and economic considerations; and the risk factors, forward-looking statements and challenges and uncertainties described in the Company’s 2023 Annual Report on Form 10-K and other public filings.

Except as required by law, the Company undertakes no obligation to revise or update any forward-looking statements as a result of new information, future events or otherwise.

Media Relations Contact:

Karina Brooks: 713-296-2191

Investor Relations Contacts:

Guy Baber: 713-296-1892

John Reid: 713-296-4380