EX-10.1



 Exhibit 10.1 

Execution Version 

PURCHASE AGREEMENT 

April 25, 2017 
 MERRILL
LYNCH, PIERCE, FENNER & SMITH INCORPORATED 
     As
Representative of the Initial Purchasers 
 c/o Merrill Lynch, Pierce, Fenner & Smith Incorporated 

One Bryant Park 
 New York, New York 10036 

Ladies and Gentlemen: 
 Introductory.
Bill Barrett Corporation, a Delaware corporation (the “Company”), proposes to issue and sell to the several Initial Purchasers named in Schedule A (the “Initial Purchasers”), acting severally and not jointly,
the respective amounts set forth in such Schedule A of $275,000,000 aggregate principal amount of the Company’s 8.75% Senior Notes due 2025 (the “Notes”). Merrill Lynch, Pierce, Fenner & Smith Incorporated has
agreed to act as the representative of the several Initial Purchasers (the “Representative”) in connection with the offering and sale of the Notes. 

The Securities (as defined below) will be issued pursuant to an indenture, to be dated as of the Closing Date (as defined in Section 2
hereof) (the “Indenture”), among the Company, the Guarantors (as defined below) and Deutsche Bank Trust Company Americas, as trustee (the “Trustee”). The Securities will be issued only in book-entry form in the name
of Cede & Co., as nominee of The Depository Trust Company (the “Depositary”) pursuant to a letter of representations and the riders thereto, to be dated on or before the Closing Date (the “DTC Agreement”),
among the Company and the Depositary. 
 The holders of the Notes will be entitled to the benefits of a registration rights agreement, to be
dated as of the Closing Date (the “Registration Rights Agreement”), among the Company, the Guarantors and the Initial Purchasers, pursuant to which the Company and the Guarantors will be required to file with the Commission (as
defined below), under the circumstances set forth therein, (i) a registration statement under the Securities Act (as defined below) relating to another series of debt securities of the Company with terms substantially identical to the Notes
(the “Exchange Notes”) and the Guarantees (the “Exchange Guarantees”) to be offered in exchange for the Notes and the Guarantees (the “Exchange Offer”) or (ii) a shelf registration statement
pursuant to Rule 415 of the Securities Act relating to the resale by certain holders of the Notes, and in each case, to use its best efforts to cause such registration statements to be declared effective. All references herein to the Exchange
Securities and the Exchange Offer are only applicable if the Company and the Guarantors are in fact required to consummate the Exchange Offer pursuant to the terms of the Registration Rights Agreement. 

The payment of principal of, premium, if any, and interest on the Notes will be fully and unconditionally guaranteed on a senior unsecured
basis, jointly and severally by (i) the entities listed on the signature pages hereof as “Guarantors” and (ii) any subsidiary of the Company formed or acquired after the Closing Date that executes an additional guarantee in
accordance with the terms of the Indenture, and their respective successors and assigns (collectively, the 

  
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“Guarantors”), pursuant to their guarantees (the “Guarantees”). The Notes and the Guarantees attached thereto are herein collectively referred to as the
“Securities”; and the Exchange Notes and the Exchange Guarantees attached thereto are herein collectively referred to as the “Exchange Securities.” 

This Agreement, the Registration Rights Agreement, the DTC Agreement, the Securities, the Exchange Securities, and the Indenture are referred
to in this Agreement collectively as the “Transaction Documents.”  

The Company understands that the Initial Purchasers propose to make an offering of the Securities on the terms and in the manner set forth
herein and in the Pricing Disclosure Package (as defined below) and agrees that the Initial Purchasers may resell, subject to the conditions set forth herein, all or a portion of the Securities to purchasers (the “Subsequent
Purchasers”) on the terms set forth in the Pricing Disclosure Package (the first time when sales of the Securities are made is referred to as the “Time of Sale”). The Securities are to be offered and sold to or through the
Initial Purchasers without being registered with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (collectively, the “Securities Act,” which term, as used
herein, includes the rules and regulations of the Commission promulgated thereunder), in reliance upon exemptions therefrom. Pursuant to the terms of the Securities and the Indenture, investors who acquire Securities shall be deemed to have agreed
that Securities may only be resold or otherwise transferred, after the date hereof, if such Securities are registered for sale under the Securities Act or if an exemption from the registration requirements of the Securities Act is available
(including the exemptions afforded by Rule 144A under the Securities Act (“Rule 144A”) or Regulation S under the Securities Act (“Regulation S”)). 

The Company has prepared and delivered to each Initial Purchaser copies of a Preliminary Offering Memorandum, dated April 24, 2017 (the
“Preliminary Offering Memorandum”), and has prepared and delivered to each Initial Purchaser copies of a Pricing Supplement, dated April 25, 2017, in the form attached hereto as Exhibit A (the “Pricing
Supplement”), describing the terms of the Securities, each for use by such Initial Purchaser in connection with its solicitation of offers to purchase the Securities. The Preliminary Offering Memorandum and the Pricing Supplement are herein
referred to as the “Pricing Disclosure Package.” Promptly after this Agreement is executed and delivered, the Company will prepare and deliver to each Initial Purchaser a final offering memorandum dated the date hereof (the
“Final Offering Memorandum”). 
 All references herein to the terms “Pricing Disclosure Package” and
“Final Offering Memorandum” shall be deemed to mean and include all information filed under the Securities Exchange Act of 1934 (as amended, the “Exchange Act,” which term, as used herein, includes the rules and
regulations of the Commission promulgated thereunder) prior to the Time of Sale and incorporated by reference in the Pricing Disclosure Package (including the Preliminary Offering Memorandum) or the Final Offering Memorandum (as the case may be),
and all references herein to the terms “amend,” “amendment” or “supplement” with respect to the Final Offering Memorandum shall be deemed to mean and include all information filed under the Exchange
Act after the Time of Sale and incorporated by reference in the Final Offering Memorandum. 

  
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 The Company hereby confirms its agreements with the Initial Purchasers as follows: 

SECTION 1. Representations and Warranties. Each of the Company and the Guarantors, jointly and severally, hereby represents, warrants
and covenants to each Initial Purchaser that, as of the date hereof and as of the Closing Date (references in this Section 1 to the “Offering Memorandum” are to (x) the Pricing Disclosure Package in the case of
representations and warranties made as of the date hereof and (y) the Pricing Disclosure Package and the Final Offering Memorandum, together, in the case of representations and warranties made as of the Closing Date): 

(a) No Registration Required. Subject to compliance by the Initial Purchasers with the representations and
warranties set forth in Section 2 hereof and with the procedures set forth in Section 7 hereof, it is not necessary in connection with the offer, sale and delivery of the Securities to the Initial Purchasers and to each Subsequent
Purchaser in the manner contemplated by this Agreement and the Offering Memorandum to register the Securities under the Securities Act or, until such time as the Exchange Securities are issued pursuant to an effective registration statement, to
qualify the Indenture under the Trust Indenture Act of 1939 (the “Trust Indenture Act,” which term, as used herein, includes the rules and regulations of the Commission promulgated thereunder). 

(b) No Integration of Offerings or General Solicitation. None of the Company, its affiliates (as such term is
defined in Rule 501 under the Securities Act) (each, an “Affiliate”), or any person acting on its or any of their behalf (other than the Initial Purchasers, as to whom the Company makes no representation or warranty) has, directly
or indirectly, solicited any offer to buy or offered to sell, or will, directly or indirectly, solicit any offer to buy or offer to sell, in the United States or to any United States citizen or resident, any security which is or would be integrated
with the sale of the Securities in a manner that would require the Securities to be registered under the Securities Act. None of the Company, its Affiliates, or any person acting on its or any of their behalf (other than the Initial Purchasers, as
to whom the Company makes no representation or warranty) has engaged or will engage, in connection with the offering of the Securities, in any form of general solicitation or general advertising within the meaning of Rule 502 under the Securities
Act. With respect to those Securities sold in reliance upon Regulation S, (i) none of the Company, its Affiliates or any person acting on its or their behalf (other than the Initial Purchasers, as to whom the Company makes no representation or
warranty) has engaged or will engage in any directed selling efforts within the meaning of Regulation S and (ii) each of the Company and its Affiliates and any person acting on its or their behalf (other than the Initial Purchasers, as to whom
the Company makes no representation or warranty) has complied and will comply with the offering restrictions set forth in Regulation S. 

(c) Eligibility for Resale under Rule 144A. The Securities are eligible for resale pursuant to Rule 144A and will
not be, at the Closing Date, of the same class as securities listed on a national securities exchange registered under Section 6 of the Exchange Act or quoted in a U.S. automated interdealer quotation system. 

  
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 (d) The Pricing Disclosure Package and Offering Memorandum. Neither
the Pricing Disclosure Package, as of the Time of Sale, nor the Final Offering Memorandum, as of its date or (as amended or supplemented in accordance with Section 3(a), as applicable) as of the Closing Date, contains or represents an untrue
statement of a material fact or omits 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 this representation, warranty and agreement
shall not apply to statements in or omissions from the Pricing Disclosure Package, the Final Offering Memorandum or any amendment or supplement thereto made in reliance upon and in conformity with information furnished to the Company in writing by
any Initial Purchaser through the Representative expressly for use in the Pricing Disclosure Package, the Final Offering Memorandum or amendment or supplement thereto, as the case may be. The Pricing Disclosure Package contains, and the Final
Offering Memorandum will contain, all the information specified in, and meeting the requirements of, Rule 144A. Except in accordance with Section 3(a), the Company has not distributed and will not distribute, prior to the later of the Closing Date
and the completion of the Initial Purchasers’ distribution of the Securities, any offering material in connection with the offering and sale of the Securities other than the Pricing Disclosure Package and the Final Offering Memorandum. 

(e) Company Additional Written Communications. The Company has not made, used, authorized, approved or distributed and
will not make, use, authorize, approve or distribute any written communication that constitutes an offer to sell or solicitation of an offer to buy the Securities other than (i) the Pricing Disclosure Package, (ii) the Final Offering
Memorandum and (iii) any electronic road show or other written communications, in each case used in accordance with Section 3(a). Each such communication by the Company or its agents and representatives pursuant to clause (iii) of the
preceding sentence (each, a “Company Additional Written Communication”), when taken together with the Pricing Disclosure Package, did not as of 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 this representation, warranty and agreement shall not apply
to statements in or omissions from each such Company Additional Written Communication made in reliance upon and in conformity with information furnished to the Company in writing by any Initial Purchaser through the Representative expressly for use
in any Company Additional Written Communication. 
 (f) Incorporated Documents. The documents incorporated or
deemed to be incorporated by reference in the Offering Memorandum at the time they were or hereafter are filed with the Commission (collectively, the “Incorporated Documents”) complied and will comply in all material respects with
the requirements of the Exchange Act. Each such Incorporated Document, when taken together with the Pricing Disclosure Package, did not as of 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. 

  
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 (g) The Purchase Agreement. This Agreement has been duly
authorized, executed and delivered by the Company and the Guarantors. 
 (h) The Registration Rights Agreement and DTC
Agreement. The Registration Rights Agreement has been duly authorized and, on the Closing Date, will have been duly executed and delivered by, and will constitute a valid and binding agreement of, the Company and the Guarantors,
enforceable in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general
equitable principles and except as rights to indemnification may be limited by applicable law. The DTC Agreement has been duly authorized and, on the Closing Date, will have been duly executed and delivered by, and will constitute a valid and
binding agreement of, the Company, enforceable in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and
remedies of creditors or by general equitable principles. 
 (i) Authorization of the Notes, the Guarantees and the
Exchange Securities. The Notes to be purchased by the Initial Purchasers from the Company will on the Closing Date be in the form contemplated by the Indenture, have been duly authorized for issuance and sale pursuant to this Agreement and the
Indenture and, at the Closing Date, will have been duly executed by the Company and, when authenticated in the manner provided for in the Indenture and delivered against payment of the purchase price therefor, will constitute valid and binding
obligations of the Company, enforceable against the Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the
rights and remedies of creditors or by general equitable principles and will be entitled to the benefits of the Indenture. The Exchange Securities have been duly and validly authorized for issuance by the Company, and when issued and authenticated
in accordance with the terms of the Indenture, the Registration Rights Agreement and the Exchange Offer, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as the
enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium, or similar laws relating to or affecting enforcement of the rights and remedies of creditors or by general principles of equity and will be entitled to the
benefits of the Indenture. The Guarantees of the Notes on the Closing Date and the Guarantees of the Exchange Notes when issued will be in the respective forms contemplated by the Indenture and have been duly authorized for issuance pursuant to this
Agreement and the Indenture; the Guarantees of the Notes, at the Closing Date, will have been duly executed by each of the Guarantors and, when the Notes have been authenticated in the manner provided for in the Indenture and issued and delivered
against payment of the purchase price therefor, the Guarantees of the Notes will constitute valid and binding agreements of the Guarantors; and, when the Exchange Notes have been authenticated in the manner provided for in the Indenture and issued
and delivered in accordance with the Registration Rights Agreement, the Guarantees of the Exchange Notes will constitute valid and binding agreements of the Guarantors, in each case, enforceable against the Guarantors in accordance with their terms,
except as the enforcement thereof may be limited by bankruptcy, 

  
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insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles and will be entitled to the benefits
of the Indenture. 
 (j) Authorization of the Indenture. The Indenture has been duly authorized by the Company
and the Guarantors and, at the Closing Date, will have been duly executed and delivered by the Company and the Guarantors and will constitute a valid and binding agreement of the Company and the Guarantors, assuming due authorization, execution and
delivery thereof by the Trustee, enforceable against the Company and the Guarantors in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating
to or affecting the rights and remedies of creditors or by general equitable principles. 
 (k) Description of the
Transaction Documents. The Transaction Documents will conform in all material respects to the respective statements relating thereto contained in the Offering Memorandum. 

(l) No Material Adverse Change. Neither the Company, the Guarantors nor any of their subsidiaries have sustained
since the date of the latest audited financial statements incorporated by reference in the Offering Memorandum any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or
from any labor dispute or court or governmental action, order or decree, nor has there been any material adverse change, or any development involving an actual or prospective material adverse change, either individually or in the aggregate, in or
affecting the management, condition, financial or otherwise, stockholders’ equity, results of operations, prospects or business of the Company, taken as a whole (a “Material Adverse Change”) otherwise than as set forth or
contemplated in the Offering Memorandum; and since such date as of which information is given in the Offering Memorandum, there has been no dividend or distribution of any kind declared, paid or made by the Company or any of its subsidiaries (except
for dividends paid to the Company by its subsidiaries) on any class of capital stock or repurchase or redemption by the Company or any of its subsidiaries of any class of capital stock other than ordinary course repurchases or redemptions in
connection with the Company’s equity compensation plans. 
 (m) Independent Accountants.
Deloitte & Touche LLP, who have audited the consolidated financial statements of the Company and its subsidiaries, and have audited the Company’s internal control over financial reporting and management’s assessment thereof, are
independent public accountants as required by the Exchange Act and the rules and regulations of the Public Company Accounting Oversight Board. 

(n) Preparation of the Financial Statements. The financial statements and the related notes thereto incorporated by
reference in the Offering Memorandum comply in all material respects with the applicable requirements of the Securities Act and the Exchange Act, as applicable, and present fairly the financial position of the Company and its subsidiaries as of the
dates indicated and the results of their operations and the changes in their cash flows for the periods specified; such financial statements have been prepared in conformity with generally accepted accounting principles applied on a consistent basis


  
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throughout the periods covered thereby, and the supporting schedules included or incorporated by reference in the Offering Memorandum present fairly the information required to be stated therein;
and the other financial information included or incorporated by reference in the Offering Memorandum has been derived from the accounting records of the Company and its subsidiaries and presents fairly the information shown thereby. 

(o) Incorporation and Good Standing of the Company and its Subsidiaries. The Company has been duly incorporated
and is validly existing as a corporation in good standing under the laws of the State of Delaware, with corporate power and authority to own or lease its properties, as the case may be, and conduct its business as described in the Offering
Memorandum and has been duly qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it owns or leases properties or conducts any business so as to require such
qualification, or is subject to no material liability or disability by reason of the failure to be so qualified in any such jurisdiction, except where the failure to be so qualified or to be in good standing in any such jurisdiction would not have a
Material Adverse Change; and each subsidiary of the Company has been duly formed and is validly existing as an entity in good standing under the laws of its jurisdiction of formation and is duly qualified as a foreign limited liability company for
the transaction of business and is in good standing under the laws of each other jurisdiction in which it owns or leases properties or conducts any business so as to require such qualification, or is subject to no material liability or disability by
reason of the failure to be so qualified in any such jurisdiction, except where the failure to be so qualified or to be in good standing in any such jurisdiction would not have a Material Adverse Change. 

(p) Capitalization and Other Capital Stock Matters. The Company has an authorized capitalization as set forth in
the Offering Memorandum and all of the issued shares of capital stock of the Company have been duly and validly authorized and issued and are fully paid and non-assessable and conform to the description of the
Common Stock contained in the Company’s filings with the Commission; and all of the issued interests of each subsidiary of the Company have been duly and validly authorized and issued, are fully paid (to the extent required by the applicable
subsidiary’s organizational documents) and non-assessable (except as such non-assessability may be affected by Section 7-80-606 of the Colorado Revised Statutes or Sections 101.206 and 101.613 of the Texas Business Organizations Code, as applicable) and (except for directors’ qualifying shares and except as
set forth in the Offering Memorandum) are owned directly or indirectly by the Company, free and clear of all liens, encumbrances, equities or claims other than those (i) arising under the Third Amended and Restated Credit Agreement dated as of
March 16, 2010, among the Company, JPMorgan Chase Bank, N.A., as administrative agent, Bank of America, N.A. and Deutsche Bank Securities Inc., as syndication agents, and Bank of Montreal and Wells Fargo Bank, N.A., as documentation agents, and
the lenders from time to time party thereto, as amended through the date hereof (the “Credit Facility”), or (ii) set forth in the Offering Memorandum. 

(q) Non-Contravention of Existing Instruments; No Further Authorizations or
Approvals Required. Neither the Company nor any of its subsidiaries is (i) in violation of its charter, bylaws or other constitutive document or (ii) in default (or, with 

  
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the giving of notice or lapse of time, would be in default) (“Default”) under any indenture, mortgage, loan or credit agreement, note, contract, franchise, lease or other instrument to
which the Company or any of its subsidiaries is a party or by which it or any of them may be bound, or to which any of the property or assets of the Company or any of its subsidiaries is subject (each, an “Existing Instrument”),
except, in the case of clause (ii) above, for such Defaults as would not, individually or in the aggregate, result in a Material Adverse Change. The execution, delivery and performance of the Transaction Documents by the Company and the
Guarantors party thereto, and the issuance and delivery of the Securities and the Exchange Securities, and consummation of the transactions contemplated hereby and thereby and by the Offering Memorandum (a) have been duly authorized by all
necessary corporate action and will not result in any violation of the provisions of the charter, bylaws or other constitutive document of the Company or any subsidiary, (b) will not conflict with or constitute a breach of, or Default or a Debt
Repayment Triggering Event (as defined below) under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to, or require the consent of any other
party to, any Existing Instrument, except for such conflicts, breaches, Defaults, liens, charges or encumbrances as would not, individually or in the aggregate, result in a Material Adverse Change and (c) will not result in any violation of any
law, administrative regulation or administrative or court decree applicable to the Company or any subsidiary. No consent, approval, authorization or other order of, or registration or filing with, any court or other governmental or regulatory
authority or agency is required for the execution, delivery and performance of the Transaction Documents by the Company and the Guarantors to the extent a party thereto, or the issuance and delivery of the Securities or the Exchange Securities, or
consummation of the transactions contemplated hereby and thereby and by the Offering Memorandum, except such as have been obtained or made by the Company and are in full force and effect under the Securities Act, such as may be required under
applicable securities laws of the several states of the United States or provinces of Canada or other relevant foreign jurisdictions and, with respect to the Company’s obligations under the Registration Rights Agreement, such as will be
required under the Securities Act and the Trust Indenture Act and as may be required by the securities laws of the several states of the United States or provinces of Canada or other relevant foreign jurisdictions. As used herein, a “Debt
Repayment Triggering Event” means any event or condition which gives, or with the giving of notice or lapse of time would give, the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder’s
behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Company or any of its subsidiaries. 

(r) No Material Actions or Proceedings. Except as described in the Offering Memorandum, there are no legal or
governmental proceedings pending to which the Company or any of its subsidiaries is a party or of which any property of the Company or any of its subsidiaries is the subject which, if determined adversely to the Company or any of its subsidiaries,
would individually or in the aggregate have a Material Adverse Change or as would materially adversely affect the consummation of the transactions contemplated hereunder; and, to the best of the Company’s knowledge, no such proceedings are
threatened or contemplated by governmental authorities or threatened by others. 

  
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 (s) Reserve Engineer. Netherland, Sewell & Associates, Inc.
(“NSAI”), whose audit letter containing its report effective as of December 31, 2016 (the “Reserve Report Letter”) is referenced in the Offering Memorandum, was, as of the date of each such report, and is, as
of the date hereof, an independent petroleum engineer with respect to the Company. 
 (t) Reserve Reports. The
information underlying the estimates of reserves of the Company and its subsidiaries, which was supplied by the Company to NSAI for purposes of reviewing the reserve reports and estimates of the Company and preparing the Reserve Report Letter in the
Offering Memorandum, including, without limitation, production, costs of operation and development, current prices for production, agreements relating to current and future operations and sales of production, was true and correct in all material
respects on the dates such estimates were made and such information was supplied and was prepared in accordance with customary industry practices; other than normal production of the reserves, intervening market commodity price fluctuations,
fluctuations of demand for such products, adverse weather conditions, unavailability or increased costs of equipment, supplies or transportation capacity, the timing of third party operations and other factors described in the Offering Memorandum,
the Company is not aware of any facts or circumstances that would result in a material adverse change in the aggregate net reserves, or the present value of future net cash flows therefrom, as described in the Offering Memorandum and as reflected in
the Reserve Report Letter; and estimates of such reserves and present values as described in the Offering Memorandum and reflected in the Reserve Report Letter comply in all material respects with the applicable requirements of Regulation S-X and Regulation S-K. 
 (u) Title to
Properties. The Company and its subsidiaries have legal, valid and defensible title to substantially all of the interests in oil and gas properties underlying the Company’s estimates of its net proved reserves contained in the
Offering Memorandum in accordance with general industry standards and to substantially all other real and personal property reflected in the Offering Memorandum as assets owned by them, in each case free and clear of all liens, encumbrances and
defects except under the Credit Facility and such as are described in the Offering Memorandum or would not have a Material Adverse Change; any other real property and buildings held under lease by the Company and its subsidiaries are held by them
under valid, subsisting and enforceable leases, with such exceptions as are not material and do not materially interfere with the use made and proposed to be made of such property and buildings by the Company and its subsidiaries; and the working
interests derived from oil, gas and mineral leases or mineral interests which constitute a portion of the real property held or leased by the Company or its subsidiaries reflect in all material respects the right of the Company and its subsidiaries
to explore, develop or produce hydrocarbons from such real property, and the care taken by the Company and its subsidiaries with respect to acquiring or otherwise procuring such leases or other property interests was generally consistent with
standard industry practices in the areas in which the Company operates for acquiring or procuring leases and interests therein to explore, develop or produce hydrocarbons. 

(v) Licenses and Permits. The Company and its subsidiaries possess all licenses,
sub-licenses, certificates, permits and other authorizations issued by, and have 

  
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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 the Offering Memorandum, except where the failure to possess or make the same would not, individually or in the aggregate, have a Material Adverse Change and except for future
permits and approvals expected to be obtained in connection with the development of the Company’s properties; and except as described in the Offering Memorandum, 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. 
 (w) Tax Law Compliance. The
Company and its subsidiaries have filed all necessary federal, state and local income and franchise tax returns in a timely manner (except in any case in which the failure to so file would not reasonably be expected to have a Material Adverse
Change) and have paid all taxes required to be paid by any of them and, if due and payable, any related or similar assessment, fine or penalty levied against any of them, except for any taxes, assessments, fines or penalties as may be being
contested in good faith and by appropriate proceedings or as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Change. The Company has made appropriate provisions in the applicable financial statements
referred to in Section 1(n) above in respect of all federal, state and local income and franchise taxes for all current or prior periods as to which the tax liability of the Company or any of its subsidiaries has not been finally determined.

 (x) Company and Guarantors Not an “Investment Company”. Neither the Company
nor any Guarantor is, or after receipt of payment for the Securities will be, an “investment company” as such term is defined in the Investment Company Act of 1940, as amended (the “Investment Company Act”). 

(y) Insurance. Each of the Company and its subsidiaries carry, or are covered by, insurance in such amounts and with
such deductibles and covering such risks as are generally deemed adequate and customary for their businesses. 
 (z) No
Price Stabilization or Manipulation. None of the Company or any of the Guarantors has taken or will take, directly or indirectly, any action designed to or that might reasonably be expected to cause or result in stabilization or
manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities. 
 (aa)
Solvency. Each of the Company and the Guarantors is, and immediately after the Closing Date will be, Solvent. As used herein, the term “Solvent” means, with respect to any person on a particular date, that on such date
(i) the fair market value of the assets of such person is greater than the total amount of liabilities (including contingent liabilities) of such person, (ii) the present fair salable value of the assets of such person is greater than the
amount that will be required to pay the probable liabilities of such person on its debts as they become absolute and matured, (iii) such person is able to realize upon its assets and pay its debts and other liabilities, including contingent
obligations, as they mature and (iv) such person does not have unreasonably small capital. 

  
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 (bb) Compliance with Sarbanes-Oxley. There is and has been no failure on
the part of the Company and any of the Company’s directors or officers, in their capacities as such, to comply with any provision of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith (the
“Sarbanes-Oxley Act”), including Section 402 related to loans and Sections 302 and 906 related to certifications, in all material respects. 

(cc) Company’s Accounting System. The Company and each of its subsidiaries maintains a system of
internal accounting controls sufficient to provide reasonable assurance that (i) material transactions are executed in accordance with management’s general or specific authorizations, (ii) transactions are recorded as necessary to
permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset accountability, (iii) access to assets is permitted only in accordance with management’s general or specific
authorization and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. There are no material weaknesses in the Company’s
internal accounting controls. Since the date of the latest audited financial statements incorporated by reference in the Offering Memorandum, there has been no change in the Company’s internal control over financial reporting that has
materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting. 

(dd) Disclosure Controls and Procedures. The Company and its subsidiaries maintain an effective system of
“disclosure controls and procedures” (as defined in Rule 13a-15(e) of the Exchange Act) that is designed to ensure that information required to be disclosed by the Company in reports that it files or
submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Commission’s rules and forms, including controls and procedures designed to ensure that such information is accumulated and
communicated to the Company’s management as appropriate to allow timely decisions regarding required disclosure; and the Company and its subsidiaries have carried out evaluations of the effectiveness of their disclosure controls and procedures
as required by Rule 13a-15e of the Exchange Act. 
 (ee) Compliance with and
Liability Under Environmental Laws. Except as described in the Offering Memorandum and except as would not, singly or in the aggregate, result in a Material Adverse Change, (i) none of the Company or any of its subsidiaries is in violation
of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree or
judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and
regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products, asbestos-containing materials or


  
 11 








 
mold (collectively, “Hazardous Materials”) or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials
(collectively, “Environmental Laws”), (ii) the Company and its subsidiaries have all permits, authorizations and approvals required under any applicable Environmental Laws and are each in compliance with their requirements,
(iii) there are no pending or, to the knowledge of the Company, threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violation, investigations or proceedings
relating to any Environmental Law against the Company or any of its subsidiaries, and (iv) to the knowledge of the Company, there are no events or circumstances that would reasonably be expected to form the basis of an order for clean-up or remediation, or any actions, suits or proceedings by any private party or governmental body or agency, against or affecting the Company or any of its subsidiaries relating to Hazardous Materials or any
Environmental Laws. 
 (ff) Compliance with ERISA. (i) Each employee benefit plan, within the meaning of
Section 3(3) of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), for which the Company or any member of its “Controlled Group” (defined as any entity, whether or not incorporated, that is
under common control with the Company within the meaning of Section 4001(a)(14) of ERISA or any entity that would be regarded as a single employer with the Company under Section 414(b),(c),(m) or (o) of the Internal Revenue Code of 1986, as
amended (the “Code”)) would have any liability (each, a “Plan”) has been maintained in compliance with its terms and the requirements of any applicable statutes, orders, rules and regulations, including but not
limited to ERISA and the Code; (ii) no prohibited transaction, within the meaning of Section 406 of ERISA or Section 4975 of the Code, has occurred with respect to any Plan, excluding transactions effected pursuant to a statutory or
administrative exemption; (iii) for each Plan that is subject to the funding rules of Section 412 of the Code or Section 302 of ERISA, no Plan has failed (whether or not waived), or is reasonably expected to fail, to satisfy the
minimum funding standards (within the meaning of Section 302 of ERISA or Section 412 of the Code) applicable to such Plan; (iv) no Plan is, or is reasonably expected to be, in “at risk status” (within the meaning of Section
303(i) of ERISA) and no Plan that is a “multiemployer plan” within the meaning of Section 4001(a)(3) of ERISA is in “endangered status” or “critical status” (within the meaning of Sections 304 and 305 of ERISA); (v) the
fair market value of the assets of each Plan exceeds the present value of all benefits accrued under such Plan (determined based on those assumptions used to fund such Plan); (vi) no “reportable event” (within the meaning of Section
4043(c) of ERISA and the regulations promulgated thereunder) has occurred or is reasonably expected to occur; (vii) each Plan that is intended to be qualified under Section 401(a) of the Code is so qualified, and nothing has occurred, whether
by action or by failure to act, which would cause the loss of such qualification; (viii) neither the Company nor any member of the Controlled Group has incurred, nor reasonably expects to incur, any liability under Title IV of ERISA (other than
contributions to the Plan or premiums to the Pension Benefit Guarantee Corporation, in the ordinary course and without default) in respect of a Plan (including a “multiemployer plan” within the meaning of Section 4001(a)(3) of ERISA); and
(ix) none of the following events has occurred or is reasonably likely to occur: (A) a material increase in the aggregate amount of contributions 

  
 12 








 
required to be made to all Plans by the Company or its Controlled Group affiliates in the current fiscal year of the Company and its Controlled Group affiliates compared to the amount of such
contributions made in the Company’s and its Controlled Group affiliates’ most recently completed fiscal year; or (B) a material increase in the Company and its subsidiaries’ “accumulated post-retirement benefit
obligations” (within the meaning of Accounting Standards Codification Topic 715-60) compared to the amount of such obligations in the Company and its subsidiaries’ most recently completed fiscal
year, except in each case with respect to the events or conditions set forth in (i) through (ix) hereof, as would not, individually or in the aggregate, have a Material Adverse Change. 

(gg) No Labor Disputes. No labor disturbance by or dispute with employees of the Company or any of its subsidiaries
exists or, to the knowledge of the Company, is contemplated or threatened, and the Company is not aware of any existing or imminent labor disturbance by, or dispute with, the employees of any of its or its subsidiaries’ principal suppliers,
contractors or customers, except as would not have a Material Adverse Change. Neither the Company nor any of its subsidiaries has received any notice of cancellation or termination with respect to any collective bargaining agreement to which it is a
party. 
 (hh) Related Party Transactions. No relationship, direct or indirect, exists between or among the Company or
any of its subsidiaries, on the one hand, and the directors, officers, stockholders, customers, suppliers or other affiliates of the Company or any of its subsidiaries, on the other, that is required by the Securities Act to be described in Offering
Memorandum and that is not so described. 
 (ii) No Unlawful Contributions or Other Payments. Neither the Company nor
any of its subsidiaries nor any director, officer or employee of the Company or any of its subsidiaries nor, to the knowledge of the Company, any agent, affiliate or other person associated with or acting on behalf of the Company or any of its
subsidiaries has (i) used any corporate funds for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity; (ii) made or taken an act in furtherance of an offer, promise or authorization of
any direct or indirect unlawful payment or benefit to any foreign or domestic government official or employee, including of any 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; (iii) violated or is in violation of any provision of the Foreign Corrupt Practices Act of 1977, as amended, or any
applicable law or regulation implementing the OECD Convention on Combating Bribery of Foreign Public Officials in International Business Transactions, or committed an offence under the Bribery Act 2010 of the United Kingdom or any other applicable
anti-bribery or anti-corruption law; or (iv) made, offered, agreed, requested or taken an act in furtherance of any unlawful bribe or other unlawful benefit, including, without limitation, any rebate, payoff, influence payment, kickback or
other unlawful or improper payment or benefit. The Company and its subsidiaries have instituted, maintain and enforce, and will continue to maintain and enforce policies and procedures designed to promote and ensure compliance with all applicable
anti-bribery and anti-corruption laws. 

  
 13 








 (jj) Compliance with Anti-Money Laundering Laws. The operations of the
Company and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements, including those of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the
applicable money laundering statutes of all jurisdictions where the Company or any of its subsidiaries conducts business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines issued, administered or
enforced by any governmental agency (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. 

(kk) No Conflicts with Sanctions Laws. Neither the Company nor any of its subsidiaries, directors, officers, or
employees, nor, to the knowledge of the Company, any agent, affiliate or other person associated with or acting on behalf of the Company or any of its subsidiaries is currently the subject or the target of any sanctions administered or enforced by
the U.S. government (including, without limitation, the Office of Foreign Assets Control of the U.S. Department of the Treasury (“OFAC”) or 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 (“UNSC”), the European Union, Her Majesty’s Treasury (“HMT”) or other relevant sanctions authority
(collectively, “Sanctions”), nor is the Company or any of its subsidiaries located, organized or resident in a country or territory that is the subject or target of Sanctions, including, without limitation, Cuba, Iran, North Korea,
Sudan, Syria and Crimea (each, a “Sanctioned Country”); and the Company will not directly or indirectly use the proceeds of the offering of the Securities hereunder, or lend, contribute or otherwise make available such proceeds to
any subsidiary, joint venture partner or other person or entity (i) to fund or facilitate any activities of or business with any person that, at the time of such funding or facilitation, is the subject or target of Sanctions, (ii) to fund
or facilitate any activities of or business in any Sanctioned Country or (iii) in any other manner that will, to the Company’s knowledge, result in a violation by any person (including any person participating in the transaction, whether
as underwriter, advisor, investor or otherwise) of Sanctions. For the past five years, the Company and its subsidiaries have not knowingly engaged in and are not now knowingly engaged in any dealings or transactions with any person that at the time
of the dealing or transaction is or was the subject or the target of Sanctions or with any Sanctioned Country. 
 (ll) No
Significant Subsidiaries. As of the date of this Agreement, the Company has no subsidiaries which, individually or considered as a whole, would be deemed to be a significant subsidiary (as such term is defined in Rule 405 under the Act). A list
of all subsidiaries of the Company as of the date of this Agreement is set forth on Schedule B hereto. 
 (mm) No
Broker’s Fees. Other than the compensation pursuant to Section 2, there is no broker, finder or other party that is entitled to receive from the Company any brokerage or finder’s fee or other fee or commission as a result of any
transactions contemplated by this Agreement. 

  
 14 








 (nn) Margin Rules. Neither the issuance, sale and delivery of the
Securities nor the application of the proceeds thereof by the Company as described in the Offering Memorandum will violate Regulation T, U or X of the Board of Governors of the Federal Reserve System or any other regulation of such Board of
Governors. 
 (oo) Forward-Looking Statements. No forward-looking statement (within the meaning of Section 27A of the
Securities Act and Section 21E of the Exchange Act) included or incorporated by reference in the Offering Memorandum has been made or reaffirmed without a reasonable basis or has been disclosed other than in good faith. 

(pp) Statistical and Market Data. Nothing has come to the attention of the Company that has caused the Company to
believe that the statistical and market-related data included or incorporated by reference in the Offering Memorandum is not based on or derived from sources that are reliable and accurate in all material respects. 

(qq) Regulation S. The Company, the Guarantors and their respective affiliates and all persons acting on their behalf
(other than the Initial Purchasers, as to whom the Company and the Guarantors make no representation) have complied with and will comply with the offering restrictions requirements of Regulation S in connection with the offering of the Securities
outside the United States and, in connection therewith, the Offering Memorandum will contain the disclosure required by Rule 902. The Securities sold in reliance on Regulation S will be represented upon issuance by a temporary global security that
may not be exchanged for definitive securities until the expiration of the 40-day restricted period referred to in Rule 903 of the Securities Act and only upon certification of beneficial ownership of such
Securities by non-U.S. persons or U.S. persons who purchased such Securities in transactions that were exempt from the registration requirements of the Securities Act. 

SECTION 2. Purchase, Sale and Delivery of the Securities. 

(a) The Securities. Each of the Company and the Guarantors agrees to issue and sell to the Initial Purchasers, severally and not
jointly, all of the Securities, and subject to the conditions set forth herein, the Initial Purchasers agree, severally and not jointly, to purchase from the Company and the Guarantors the aggregate principal amount of Securities set forth opposite
their names on Schedule A, at a purchase price of 98.5% of the principal amount thereof payable on the Closing Date, in each case, on the basis of the representations, warranties and agreements herein contained, and upon the terms herein set
forth. 
 (b) The Closing Date. Delivery of the Securities to be purchased by the Initial Purchasers and payment therefor
shall be made at the offices of Latham & Watkins LLP, 885 Third Avenue, New York, New York 10022 (or such other place as may be agreed to by the Company and the Representative) at 9:00 a.m. New York City time, on April 28, 2017, or
such other time and date as may be agreed to by the Company and the Representative (the time and date of such closing are called the “Closing Date”). 

(c) Delivery of the Securities. The Issuer shall deliver, or cause to be delivered, to the nominee of the Depositary for the
accounts of the several Initial Purchasers of the Notes to be 

  
 15 








 
purchased by them, in one or more global notes representing the Notes (collectively, the “Global Notes”) at the Closing Date against the irrevocable release of a wire transfer of
immediately available funds for the amount of the purchase price therefore to a bank account designated by the Company. The Global Notes shall be in such denominations and registered in the name of Cede & Co., as nominee of the Depositary,
pursuant to the DTC Agreement, as the Representative may designate. Time shall be of the essence, and delivery at the time and place specified in this Agreement is a further condition to the obligations of the Initial Purchasers. 

(d) Initial Purchasers as Qualified Institutional Buyers. Each Initial Purchaser severally and not jointly represents and
warrants to, and agrees with, the Company that: 
 (i) it will offer and sell Securities only to (a) persons who it
reasonably believes are “qualified institutional buyers” within the meaning of Rule 144A (“Qualified Institutional Buyers”) in transactions meeting the requirements of Rule 144A or (b) upon the terms and conditions
set forth in Annex I to this Agreement; 
 (ii) it is an institutional “accredited investor” within the
meaning of Rule 501(a)(1), (2), (3) or (7) under the Securities Act; and 
 (iii) it has not and will not offer or sell
Securities by, any form of general solicitation or general advertising, including but not limited to the methods described in Rule 502(c) under the Securities Act, and has not and will not use, authorize, distribute or approve any written
communication that constitutes an offer to sell or solicitation of an offer to buy the Securities other than the Pricing Disclosure Package, the Final Offering Memorandum and other communications approved in advance by the Company. 

SECTION 3. Additional Covenants. Each of the Company and the Guarantors further covenants and agrees with each Initial Purchaser
as follows: 
 (a) Preparation of Final Offering Memorandum; Initial Purchasers’ Review of Proposed
Amendments and Supplements and Company Additional Written Communications. As promptly as practicable following the Time of Sale and in any event not later than the second business day following the date hereof, the Company will prepare
and deliver to the Initial Purchasers the Final Offering Memorandum, which shall consist of the Preliminary Offering Memorandum as modified only by the information contained in the Pricing Supplement. The Company will not amend or supplement the
Preliminary Offering Memorandum or the Pricing Supplement. The Company will not amend or supplement the Final Offering Memorandum prior to the Closing Date unless the Representative shall previously have been furnished a copy of the proposed
amendment or supplement at least two business days prior to the proposed use or filing, and shall not have objected to such amendment or supplement. Before using, authorizing, approving or distributing any Company Additional Written Communication,
the Company will furnish to the Representative a copy of such written communication for review and will not use, authorize, approve or distribute any such written communication to which the Representative reasonably objects. 

  
 16 








 (b) Amendments and Supplements to the Final Offering Memorandum and Other
Securities Act Matters. If at any time prior to the Closing Date (i) any event shall occur or condition shall exist as a result of which any of the Pricing Disclosure Package 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
Pricing Disclosure Package to comply with law, the Company and the Guarantors will immediately notify the Initial Purchasers thereof and forthwith prepare and (subject to Section 3(a) hereof) furnish to the Initial Purchasers such amendments or
supplements to the Pricing Disclosure Package as may be necessary so that the statements in the Pricing Disclosure Package as so amended or supplemented will not, in the light of the circumstances under which they were made, be misleading or so that
the Pricing Disclosure Package will comply with all applicable law. If, prior to the completion of the placement of the Securities by the Initial Purchasers with the Subsequent Purchasers, or prior to the expiration of nine months after the date of
the Final Offering Memorandum, whichever is shorter, any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Final Offering Memorandum, as then amended or supplemented, in order to make the statements
therein, in the light of the circumstances when the Final Offering Memorandum is delivered to a Subsequent Purchaser, not misleading, or if in the judgment of the Representative or counsel for the Initial Purchasers it is otherwise necessary to
amend or supplement the Final Offering Memorandum to comply with law, the Company and the Guarantors agree to promptly prepare and (subject to Section 3 hereof) furnish at its own expense to the Initial Purchasers, amendments or supplements to
the Final Offering Memorandum so that the statements in the Final Offering Memorandum as so amended or supplemented will not, in the light of the circumstances at the Closing Date and at the time of sale of Securities, be misleading or so that the
Final Offering Memorandum, as amended or supplemented, will comply with all applicable law. 
 The Company hereby expressly
acknowledges that the indemnification and contribution provisions of Sections 8 and 9 hereof are specifically applicable and relate to each offering memorandum, registration statement, prospectus, amendment or supplement referred to in this
Section 3. 
 (c) Copies of the Offering Memorandum. The Company agrees to furnish the Initial Purchasers,
without charge, as many copies of the Pricing Disclosure Package and the Final Offering Memorandum and any amendments and supplements thereto as they shall reasonably request. 

(d) Blue Sky Compliance. Each of the Company and the Guarantors shall cooperate with the Initial Purchasers and
counsel for the Initial Purchasers to qualify or register (or to obtain exemptions from qualifying or registering) all or any part of the Securities for offer and sale under the securities laws of the several states of the United States, the
provinces of Canada or any other jurisdictions reasonably designated by the Representative, shall comply with such laws and shall continue such qualifications, registrations and exemptions in effect so long as required for the distribution of the
Securities. Notwithstanding the foregoing, none of the Company or any of the Guarantors shall be 

  
 17 








 
required to qualify as a foreign corporation or to take any action that would subject it to general service of process in any such jurisdiction where it is not presently qualified or where it
would be subject to taxation as a foreign corporation. The Company will advise the Representative promptly of the suspension of the qualification or registration of (or any such exemption relating to) the Securities for offering, sale or trading in
any jurisdiction or any initiation or threat of any proceeding for any such purpose, and in the event of the issuance of any order suspending such qualification, registration or exemption, each of the Company and the Guarantors shall use its best
efforts to obtain the withdrawal thereof at the earliest possible moment. 
 (e) Use of Proceeds. The Company
shall apply the net proceeds from the sale of the Securities sold by it in the manner described under the caption “Use of Proceeds” in the Pricing Disclosure Package. 

(f) The Depositary. The Company will cooperate with the Initial Purchasers and use its best efforts to permit the
Securities to be eligible for clearance and settlement through the facilities of the Depositary. 
 (g) Additional Issuer
Information. Prior to the completion of the placement of the Securities by the Initial Purchasers with the Subsequent Purchasers, or prior to the expiration of nine months after the date of the Final Offering Memorandum, whichever is
shorter, the Company shall file, on a timely basis, with the Commission and the NYSE all reports and documents required to be filed under Section 13 or 15 of the Exchange Act. Additionally, at any time when the Company is not subject to
Section 13 or 15 of the Exchange Act, for the benefit of holders and beneficial owners from time to time of the Securities, the Company shall furnish, at its expense, upon request, to holders and beneficial owners of Securities and prospective
purchasers of Securities information (“Additional Issuer Information”) satisfying the requirements of Rule 144A(d). 

(h) Agreement Not To Offer or Sell Additional Securities. During the period of 60 days following the date hereof,
the Company will not, without the prior written consent of the Representative (which consent may be withheld at the sole discretion of Merrill Lynch), directly or indirectly, sell, offer, contract or grant any option to sell, pledge, transfer or
establish an open “put equivalent position” within the meaning of Rule 16a-1 under the Exchange Act, or otherwise dispose of or transfer, or announce the offering of, or file any registration
statement under the Securities Act in respect of, any debt securities of the Company or securities exchangeable for or convertible into debt securities of the Company (other than as contemplated by this Agreement and to register the Exchange
Securities). 
 (i) Future Reports to the Initial Purchasers. While the Securities remain outstanding and are
“restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act, the Company will, during any period in which the Company is not subject to and in compliance with Section 13 or 15(d) of the Exchange Act, furnish
to holders of the Securities and prospective purchasers of the Securities designated by such holders, upon the request of such holders or such prospective purchasers, the information required to be delivered pursuant to Rule 144A(d)(4) under the
Securities Act. 

  
 18 








 (j) No Integration. The Company agrees that it will not and will
cause its controlled Affiliates not to make any offer or sale of securities of the Company of any class if, as a result of the doctrine of “integration” referred to in Rule 502 under the Securities Act, such offer or sale would render
invalid (for the purpose of (i) the sale of the Securities by the Company to the Initial Purchasers, (ii) the resale of the Securities by the Initial Purchasers to Subsequent Purchasers or (iii) the resale of the Securities by such
Subsequent Purchasers to others) the exemption from the registration requirements of the Securities Act provided by Section 4(a)(2) thereof or by Rule 144A or by Regulation S thereunder or otherwise. 

(k) No General Solicitation or Directed Selling Efforts. The Company agrees that it will not and will not permit any of
its controlled Affiliates or any other person acting on its or their behalf (other than the Initial Purchasers, as to which no covenant is given) to (i) solicit offers for, or offer or sell, the Securities by means of any form of general
solicitation or general advertising within the meaning of Rule 502(c) of Regulation D or in any manner involving a public offering within the meaning of Section 4(a)(2) of the Securities Act or (ii) engage in any directed selling efforts with
respect to the Securities within the meaning of Regulation S, and the Company will and will cause all such persons to comply with the offering restrictions requirement of Regulation S with respect to the Securities. 

(l) No Restricted Resales. The Company will not, and will not permit any of its controlled affiliates (as defined in
Rule 144 under the Securities Act) to resell any of the Notes that have been reacquired by any of them. 
 (m) Legended
Securities. Each Global Note will bear the legend contained in “Transfer Restrictions” in the Preliminary Offering Memorandum for the time period and upon the other terms stated in the Preliminary Offering Memorandum. 

The Representative on behalf of the several Initial Purchasers, may, in its sole discretion, waive in writing the performance by the Company
or any Guarantor of any one or more of the foregoing covenants or extend the time for their performance. 
 SECTION 4. Payment of
Expenses. Each of the Company and the Guarantors agrees to pay all costs, fees and expenses incurred in connection with the performance of its obligations hereunder and in connection with the transactions contemplated hereby, including,
without limitation, (i) all expenses incident to the issuance and delivery of the Securities (including all printing and engraving costs), (ii) all necessary issue, transfer and other stamp taxes in connection with the issuance and sale of the
Securities to the Initial Purchasers, (iii) all fees and expenses of the Company’s and the Guarantors’ counsel, independent public or certified public accountants and other advisors, (iv) all costs and expenses incurred in
connection with the preparation, printing, filing, shipping and distribution of the Pricing Disclosure Package and the Final Offering Memorandum (including financial statements and exhibits), and all amendments and supplements thereto, and the
Transaction Documents, (v) all filing fees, attorneys’ fees and expenses incurred by the Company, the Guarantors or the Initial Purchasers in connection with qualifying or registering (or obtaining exemptions from the qualification or
registration of) all or any part of the Securities for offer and sale under the securities laws of the several states of the United 

  
 19 








 
States, the provinces of Canada or other jurisdictions designated by the Initial Purchasers (including, without limitation, the cost of preparing, printing and mailing preliminary and final blue
sky or legal investment memoranda and any related supplements to the Pricing Disclosure Package or the Final Offering Memorandum, (vi) the fees and expenses of the Trustee, including the fees and disbursements of counsel for the Trustee in
connection with the Indenture, the Securities and the Exchange Securities, (vii) any fees payable in connection with the rating of the Securities or the Exchange Securities with the ratings agencies, (viii) any filing fees incident to, and
any reasonable fees and disbursements of counsel to the Initial Purchasers in connection with the review by FINRA, if any, of the terms of the sale of the Securities or the Exchange Securities, (ix) all fees and expenses (including reasonable
fees and expenses of counsel) of the Company and the Guarantors in connection with approval of the Securities by the Depositary for “book-entry” transfer, and the performance by the Company and the Guarantors of their respective other
obligations under this Agreement and (x) all expenses incident to the “road show” for the offering of the Securities. Except as provided in this Section 4 and Sections 6, 8 and 9 hereof, the Initial Purchasers shall pay
their own expenses, including the fees and disbursements of their counsel. 
 SECTION 5. Conditions of the Obligations of the Initial
Purchasers. The obligations of the several Initial Purchasers to purchase and pay for the Securities as provided herein on the Closing Date shall be subject to the accuracy of the representations and warranties on the part of the Company
and the Guarantors set forth in Section 1 hereof as of the date hereof and as of the Closing Date as though then made and to the timely performance by the Company of its covenants and other obligations hereunder, and to each of the following
additional conditions: 
 (a) Accountants’ Comfort Letter. On the date hereof, the Initial
Purchasers shall have received from Deloitte & Touche LLP, the independent registered public accounting firm for the Company, a “comfort letter” dated the date hereof addressed to the Initial Purchasers, in form and substance
satisfactory to the Representative, covering the financial information in the Pricing Disclosure Package and other customary matters. In addition, on the Closing Date, the Initial Purchasers shall have received from such accountants a
“bring-down comfort letter” dated the Closing Date addressed to the Initial Purchasers, in form and substance satisfactory to the Representative, in the form of the “comfort letter” delivered on the date hereof, except that
(i) it shall cover the financial information in the Final Offering Memorandum and any amendment or supplement thereto and (ii) procedures shall be brought down to a date no more than 3 days prior to the Closing Date. 

(b) Reserve Engineer Letters. On the date hereof and on the Closing Date, the Initial Purchasers shall have received, in
form and substance reasonably satisfactory to the Representative, letters, dated the respective dates of delivery thereof and addressed to the Initial Purchasers, containing statements and information of the type customarily included in reserve
engineer’s letters to initial purchasers with respect to the oil and gas reserves information contained or incorporated by reference in the Pricing Disclosure Package or the Final Offering Memorandum, as applicable. 

(c) No Material Adverse Change or Ratings Agency Change. For the period from and after the date of this Agreement and
prior to the Closing Date: 
 (i) in the judgment of the Representative there shall not have occurred any Material Adverse
Change; and 
 (ii) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or
potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded the Company or any of its subsidiaries or any of their securities or indebtedness by any
“nationally recognized statistical rating organization” registered under Section15E of the Exchange Act. 

  
 20 








 (d) Opinion of Counsel for the Company. On the Closing Date the
Initial Purchasers shall have received the favorable opinion and 10b-5 statement of Davis Graham & Stubbs LLP, counsel for the Company, dated as of the Closing Date, the form of which is attached as
Exhibit B. 
 (e) Opinion of Counsel for the Initial Purchasers. On the Closing Date
the Initial Purchasers shall have received the favorable opinion and 10b-5 statement of Latham & Watkins LLP, counsel for the Initial Purchasers, dated as of such Closing Date, with respect to such
matters as may be reasonably requested by the Initial Purchasers. 
 (f) Opinion of Company General Counsel. Kenneth
A. Wonstolen, Senior Vice President, General Counsel and Secretary of the Company, as counsel for the Company, shall have furnished to the Representative, at the request of the Company, his written opinion, dated the Closing Date, and addressed to
the Initial Purchasers, in form and substance reasonably satisfactory to the Representative, to the effect set forth in Exhibit C hereto. 

(g) Officers’ Certificate. On the Closing Date the Initial Purchasers shall have received a written certificate
executed by an executive officer of the Company and each Guarantor and the Principal Financial Officer or Chief Accounting Officer of the Company and each Guarantor, dated as of the Closing Date, to the effect set forth in Section 5(c)(ii)
hereof, and further to the effect that: 
 (i) for the period from and after the date of this Agreement and prior to the
Closing Date there has not occurred any Material Adverse Change; 
 (ii) the representations, warranties and covenants of the
Company and the Guarantors set forth in Section 1 hereof were true and correct as of the date hereof and are true and correct as of the Closing Date with the same force and effect as though expressly made on and as of the Closing Date; and 

(iii) each of the Company and the Guarantors has complied with all the agreements and satisfied all the conditions on its part
to be performed or relating to the accuracy of certain financial information of the Company contained in the Offering Memorandum at or prior to the Closing Date. 

(h) Good Standing. The Representative shall have received on and as of the Closing Date, satisfactory evidence of the
good standing of the Company and its subsidiaries 

  
 21 








 
in their respective jurisdictions of organization and their good standing in such other jurisdictions as the Representative may reasonably request, in each case in writing or any standard form of
telecommunication from the appropriate governmental authorities of such jurisdictions. 
 (i) Indenture; Registration
Rights Agreement. The Company and the Guarantors shall have executed and delivered the Indenture, in form and substance reasonably satisfactory to the Initial Purchasers, and the Initial Purchasers shall have received executed copies
thereof. The Company and the Guarantors shall have executed and delivered the Registration Rights Agreement, in form and substance reasonably satisfactory to the Initial Purchasers, and the Initial Purchasers shall have received such executed
counterparts. 
 (j) Principal Financial Officer’s Certificate. On the date hereof and on the
Closing Date the Initial Purchasers shall have received a written certificate executed by the Principal Financial Officer of the Company, in the form attached hereto as Exhibit D. 

(k) Additional Documents. On or before the Closing Date, the Initial Purchasers and counsel for the Initial Purchasers
shall have received such information, documents and opinions as they may reasonably require for the purposes of enabling them to pass upon the issuance and sale of the Securities as contemplated herein, or in order to evidence the accuracy of any of
the representations and warranties, or the satisfaction of any of the conditions or agreements, herein contained. 
 If any condition
specified in this Section 5 is not satisfied when and as required to be satisfied, this Agreement may be terminated by the Representative by notice to the Company at any time on or prior to the Closing Date, which termination shall be without
liability on the part of any party to any other party, except that Sections 4, 6, 8 and 9 hereof shall at all times be effective and shall survive such termination. 

SECTION 6. Reimbursement of Initial Purchasers’ Expenses. If this Agreement is terminated by the
Representative pursuant to Section 5 or 10 hereof, including if the sale to the Initial Purchasers of the Securities on the Closing Date is not consummated because of any refusal, inability or failure on the part of the Company to perform any
agreement herein or to comply with any provision hereof, the Company agrees to reimburse the Initial Purchasers, severally, upon demand for all out-of-pocket expenses
that shall have been reasonably incurred by the Initial Purchasers in connection with the proposed purchase and the offering and sale of the Securities, including, without limitation, fees and disbursements of counsel, printing expenses, travel
expenses, postage, facsimile and telephone charges. 
 SECTION 7. Offer, Sale and Resale Procedures. Each of the Initial Purchasers,
on the one hand, and the Company and each of the Guarantors, on the other hand, hereby agree to observe the following procedures in connection with the offer and sale of the Securities: 

(a) Offers and sales of the Securities will be made only by the Initial Purchasers or Affiliates thereof qualified to do so in
the jurisdictions in which such offers or sales are made. Each such offer or sale shall only be made to persons whom the offeror or 

  
 22 








 
seller reasonably believes to be Qualified Institutional Buyers or non-U.S. persons outside the United States to whom the offeror or seller reasonably
believes offers and sales of the Securities may be made in reliance upon Regulation S upon the terms and conditions set forth in Annex I hereto, which Annex I is hereby expressly made a part hereof. 

(b) No general solicitation or general advertising (within the meaning of Rule 502 under the Securities Act) will be used in
the United States in connection with the offering of the Securities. 
 (c) Upon original issuance by the Company, and until
such time as the same is no longer required under the applicable requirements of the Securities Act, the Securities (and all securities issued in exchange therefor or in substitution thereof, other than the Exchange Securities) shall bear the legend
contained in “Transfer Restrictions” in the Preliminary Offering Memorandum. 
 SECTION 8. Indemnification. 

(a) Indemnification of the Initial Purchasers. Each of the Company and the Guarantors, jointly and severally, agrees to
indemnify and hold harmless each Initial Purchaser, its affiliates, directors, officers and employees, and each person, if any, who controls any Initial Purchaser within the meaning of the Securities Act and the Exchange Act against any loss, claim,
damage, liability or expense, as incurred, to which such Initial Purchaser, affiliate, director, officer, employee or controlling person may become subject, under the Securities Act, the Exchange Act or other federal or state statutory law or
regulation, or at common law or otherwise (including in settlement of any litigation, if such settlement is effected with the written consent of the Company), insofar as such loss, claim, damage, liability or expense (or actions in respect thereof
as contemplated below) arises out of or is based upon any untrue statement or alleged untrue statement of a material fact contained in the Preliminary Offering Memorandum, the Pricing Supplement, any Company Additional Written Communication or
the Final Offering Memorandum (or any amendment or supplement thereto), or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made,
not misleading; and to reimburse each Initial Purchaser and each such affiliate, director, officer, employee or controlling person for any and all expenses (including the documented fees and disbursements of counsel chosen by Merrill Lynch, Pierce,
Fenner & Smith Incorporated) as such expenses are reasonably incurred by such Initial Purchaser or such affiliate, director, officer, employee or controlling person in connection with investigating, defending, settling or compromising
(pursuant to a settlement or compromise effected with the written consent of the Company) or paying upon final judgment any such loss, claim, damage, liability, expense or action; provided, however, that the foregoing indemnity agreement shall not
apply, with respect to an Initial Purchaser, to any loss, claim, damage, liability or expense to the extent, but only to the extent, arising out of or based upon any untrue statement or alleged untrue statement or omission or alleged omission made
in reliance upon and in conformity with written information furnished to the Company by such Initial Purchaser through the Representative expressly for use in the Preliminary Offering Memorandum, the Pricing Supplement, any Company Additional
Written Communication or the Final Offering Memorandum (or any amendment or supplement thereto). The indemnity agreement set forth in this Section 8(a) shall be in addition to any liabilities that the Company may otherwise have. 

  
 23 








 (b) Indemnification of the Company and the Guarantors. Each Initial Purchaser
agrees, severally and not jointly, to indemnify and hold harmless the Company, each Guarantor, each of their respective directors and each person, if any, who controls the Company or any Guarantor within the meaning of the Securities Act or the
Exchange Act, against any loss, claim, damage, liability or expense, as incurred, to which the Company, any Guarantor or any such director or controlling person may become subject, under the Securities Act, the Exchange Act, or other federal or
state statutory law or regulation, or at common law or otherwise (including in settlement of any litigation, if such settlement is effected with the written consent of such Initial Purchaser), insofar as such loss, claim, damage, liability or
expense (or actions in respect thereof as contemplated below) arises out of or is based upon any untrue statement or alleged untrue statement of a material fact contained in the Preliminary Offering Memorandum, the Pricing Supplement, any Company
Additional Written Communication or the Final Offering Memorandum (or any amendment or supplement thereto), or the omission or alleged omission therefrom of 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 the Preliminary Offering Memorandum, the
Pricing Supplement, any Company Additional Written Communication or the Final Offering Memorandum (or any amendment or supplement thereto), in reliance upon and in conformity with written information furnished to the Company by such Initial
Purchaser through the Representative expressly for use therein; and to reimburse the Company, any Guarantor and each such director or controlling person for any and all expenses (including the documented fees and disbursements of counsel) as such
expenses are reasonably incurred by the Company, any Guarantor or such director or controlling person in connection with investigating, defending, settling or compromising (pursuant to a settlement or compromise effected with the written consent of
the Company) or paying upon final judgment any such loss, claim, damage, liability, expense or action. Each of the Company and the Guarantors hereby acknowledges that the only information that the Initial Purchasers through the Representative have
furnished to the Company expressly for use in the Preliminary Offering Memorandum, the Pricing Supplement, any Company Additional Written Communication or the Final Offering Memorandum (or any amendment or supplement thereto) are the statements set
forth in the fifth, sixth and seventh paragraphs under the caption “Plan of Distribution” in the Preliminary Offering Memorandum and the Final Offering Memorandum. The indemnity agreement set forth in this Section 8(b) shall be in addition
to any liabilities that each Initial Purchaser may otherwise have. 
 (c) Notifications and Other Indemnification Procedures.
Promptly after receipt by an indemnified party under this Section 8 of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against an indemnifying party under this Section 8,
notify the indemnifying party in writing of the commencement thereof; provided that the failure to so notify the indemnifying party will not relieve it from any liability which it may have to any indemnified party under this Section 8 except to
the extent that it has been materially prejudiced by such failure (through the forfeiture of substantive rights and defenses) and shall not relieve the indemnifying party from any liability that the indemnifying party may have to an indemnified
party other than under this Section 8. In case any such action is 

  
 24 








 
brought against any indemnified party and such indemnified party seeks or intends to seek indemnity from an indemnifying party, the indemnifying party will be entitled to participate in and, to
the extent that it shall elect, jointly with all other indemnifying parties similarly notified, by written notice delivered to the indemnified party promptly after receiving the aforesaid notice from such indemnified party, to assume the defense
thereof with counsel reasonably satisfactory to such indemnified party; provided, however, if the defendants in any such action include both the indemnified party and the indemnifying party and the indemnified party shall have reasonably concluded
that a conflict may arise between the positions of the indemnifying party and the indemnified party in conducting the defense of any such action or that there may be legal defenses available to it and/or other indemnified parties which are different
from or additional to those available to the indemnifying party, the indemnified party or parties shall have the right to select separate counsel to assume such legal defenses and to otherwise participate in the defense of such action on behalf of
such indemnified party or parties. Upon receipt of notice from the indemnifying party to such indemnified party of such indemnifying party’s election so to assume the defense of such action and approval by the indemnified party of counsel, the
indemnifying party will not be liable to such indemnified party under this Section 8 for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof unless (i) the indemnified party
shall have employed separate counsel in accordance with the proviso to the immediately preceding sentence (it being understood, however, that the indemnifying party shall not be liable for the expenses of more than one separate counsel (together
with local counsel (in each jurisdiction)), which shall be selected by Merrill Lynch, Pierce, Fenner & Smith Incorporated (in the case of counsel representing the Initial Purchasers or their related persons), representing the indemnified
parties who are parties to such action) or (ii) the indemnifying party shall not have employed counsel reasonably satisfactory to the indemnified party to represent the indemnified party within a reasonable time after notice of commencement of
the action, in each of which cases the fees and expenses of counsel shall be at the expense of the indemnifying party. 
 (d)
Settlements. The indemnifying party under this Section 8 shall not be liable for any settlement of any proceeding effected without its written consent, which will not be unreasonably withheld, but if settled with such consent or if there
be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party against any loss, claim, damage, liability or expense by reason of such settlement or judgment. No indemnifying party shall, without the prior
written consent of the indemnified party, effect any settlement, compromise or consent to the entry of judgment in any pending or threatened action, suit or proceeding in respect of which any indemnified party is or could have been a party and
indemnity was or could have been sought hereunder by such indemnified party, unless such settlement, compromise or consent (i) includes an unconditional release of such indemnified party from all liability on claims that are the subject matter
of such action, suit or proceeding and (ii) does not include any statements as to or any findings of fault, culpability or failure to act by or on behalf of any indemnified party. 

SECTION 9. Contribution. If the indemnification provided for in Section 8 hereof is for any reason held to be unavailable to or
otherwise insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities or expenses referred to therein, then each indemnifying party shall contribute to the aggregate amount paid or payable by such
indemnified party, as incurred, as a result of any losses, claims, damages, liabilities or expenses 

  
 25 








 
referred to therein (i) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the
other hand, from the offering of the Securities pursuant to this Agreement 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 and the Guarantors, on the one hand, and the Initial Purchasers, on the other hand, in connection with the statements or omissions which resulted in such
losses, claims, damages, liabilities or expenses, as well as any other relevant equitable considerations. The relative benefits received by the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the other hand, in connection
with the offering of the Securities pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of the Securities pursuant to this Agreement (before deducting expenses) received by
the Company, and the total discount received by the Initial Purchasers bear to the aggregate initial offering price of the Securities. The relative fault of the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the other
hand, shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company and the
Guarantors, on the one hand, or the Initial Purchasers, on the other hand, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. 

The amount paid or payable by a party as a result of the losses, claims, damages, liabilities and expenses referred to above shall be deemed
to include, subject to the limitations set forth in Section 8 hereof, any legal or other fees or expenses reasonably incurred by such party in connection with investigating or defending any action or claim. The provisions set forth in
Section 8 hereof with respect to notice of commencement of any action shall apply if a claim for contribution is to be made under this Section 9; provided, however, that no additional notice shall be required with respect to any action for
which notice has been given under Section 8 hereof for purposes of indemnification. 
 The Company, the Guarantors and the Initial
Purchasers agree that it would not be just and equitable if contribution pursuant to this Section 9 were determined by pro rata allocation (even if the Initial Purchasers were treated as one entity for such purpose) or by any other method of
allocation which does not take account of the equitable considerations referred to in this Section 9. 
 Notwithstanding the provisions
of this Section 9, no Initial Purchaser shall be required to contribute any amount in excess of the discount received by such Initial Purchaser in connection with the Securities distributed by it. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11 of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Initial Purchasers’ obligations to contribute
pursuant to this Section 9 are several, and not joint, in proportion to their respective commitments as set forth opposite their names in Schedule A. For purposes of this Section 9, each director, officer and employee of an Initial
Purchaser and each person, if any, who controls an Initial Purchaser within the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as such Initial Purchaser, and each director of the Company or any
Guarantor, and each person, if any, who controls the Company or any Guarantor with the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as the Company and the Guarantors. 

  
 26 








 SECTION 10. Termination of this Agreement. Prior to the Closing Date, this
Agreement may be terminated by the Representative by notice given to the Company if at any time: (i) trading or quotation in any of the Company’s securities shall have been suspended or limited by the Commission or by NYSE, or trading in
securities generally on either the Nasdaq Stock Market or the NYSE shall have been suspended or limited, or minimum or maximum prices shall have been generally established on any of such quotation system or stock exchange by the Commission or FINRA;
(ii) a general banking moratorium shall have been declared by any of federal, New York or Delaware authorities; (iii) there shall have occurred any outbreak or escalation of national or international hostilities or any crisis or calamity,
or any change in the United States or international financial markets, or any substantial change or development involving a prospective substantial change in United States’ or international political, financial or economic conditions, as in the
judgment of the Representative is material and adverse and makes it impracticable or inadvisable to proceed with the offering sale or delivery of the Securities in the manner and on the terms described in the Pricing Disclosure Package or to enforce
contracts for the sale of securities; (iv) in the judgment of the Representative there shall have occurred any Material Adverse Change; or (v) the Company shall have sustained a loss by strike, fire, flood, earthquake, accident or other
calamity of such character as in the judgment of the Representative may interfere materially with the conduct of the business and operations of the Company regardless of whether or not such loss shall have been insured. Any termination pursuant to
this Section 10 shall be without liability on the part of (i) the Company or any Guarantor to any Initial Purchaser, except that the Company and the Guarantors shall be obligated to reimburse the expenses of the Initial Purchasers pursuant
to Sections 4 and 6 hereof, (ii) any Initial Purchaser to the Company, or (iii) any party hereto to any other party except that the provisions of Sections 8 and 9 hereof shall at all times be effective and shall survive such
termination. 
 SECTION 11. Representations and Indemnities to Survive Delivery. The respective indemnities, agreements,
representations, warranties and other statements of the Company, the Guarantors, their respective officers and the several Initial Purchasers set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any
investigation made by or on behalf of any Initial Purchaser, the Company, any Guarantor or any of their partners, officers or directors or any controlling person, as the case may be, and will survive delivery of and payment for the Securities sold
hereunder and any termination of this Agreement. 
 SECTION 12. Notices. All communications hereunder shall be in writing and
shall be mailed, hand delivered, couriered or facsimiled and confirmed to the parties hereto as follows: 
 If to the Initial Purchasers:

 Merrill Lynch, Pierce, Fenner & Smith Incorporated 

50 Rockefeller Plaza 

New York, New York 10020 

Facsimile: 212-901-7897 

Attention: High Yield Legal Department 

  
 27 








 If to the Company or the Guarantors: 

Bill Barrett Corporation 

1099 18th Street, Suite 2300, Denver, Colorado, 80202 

Facsimile: 303-291-0420 

Attention: Principal Financial Officer 

Email address: bcrawford@billbarrettcorp.com 

Any party hereto may change the address or facsimile number for receipt of communications by giving written notice to the others. 

SECTION 13. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto, and to the benefit
of the indemnified parties referred to in Sections 8 and 9 hereof, and in each case their respective successors, and no other person will have any right or obligation hereunder. The term “successors” shall not include any Subsequent
Purchaser or other purchaser of the Securities as such from any of the Initial Purchasers merely by reason of such purchase. 
 SECTION 14.
Authority of the Representative. Any action by the Initial Purchasers hereunder may be taken by Merrill Lynch, Pierce, Fenner & Smith Incorporated on behalf of the Initial Purchasers, and any such action taken by Merrill Lynch,
Pierce, Fenner & Smith Incorporated shall be binding upon the Initial Purchasers. 
 SECTION 15. Partial Unenforceability.
The invalidity or unenforceability of any section, paragraph or provision of this Agreement shall not affect the validity or enforceability of any other section, paragraph or provision hereof. If any section, paragraph or provision of this Agreement
is for any reason determined to be invalid or unenforceable, there shall be deemed to be made such minor changes (and only such minor changes) as are necessary to make it valid and enforceable. 

SECTION 16. Governing Law Provisions. THIS AGREEMENT, AND ANY CLAIM, CONTROVERSY OR DISPUTE RELATING TO OR ARISING OUT OF THIS
AGREEMENT, SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK APPLICABLE TO AGREEMENTS MADE AND TO BE PERFORMED IN SUCH STATE WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES THEREOF. 

(a) Consent to Jurisdiction. Any legal suit, action or proceeding arising out of or based upon this Agreement or the transactions
contemplated hereby (“Related Proceedings”) may be instituted in the federal courts of the United States of America located in the City and County of New York or the courts of the State of New York in each case located in the City
and County of New York (collectively, the “Specified Courts”), and each party irrevocably submits to the exclusive jurisdiction (except for suits, actions, or proceedings instituted in regard to the enforcement of a judgment of any
Specified Court in a Related Proceeding a “Related Judgment”, as to which such jurisdiction is non-exclusive) of the Specified Courts in any Related Proceeding. Service of any process,
summons, notice or document by mail to such party’s address 

  
 28 








 
set forth above shall be effective service of process for any Related Proceeding brought in any Specified Court. The parties irrevocably and unconditionally waive any objection to the laying of
venue of any Related Proceeding in the Specified Courts and irrevocably and unconditionally waive and agree not to plead or claim in any Specified Court that any Related Proceeding brought in any Specified Court has been brought in an inconvenient
forum. 
 SECTION 17. Default of One or More of the Several Initial Purchasers. If any one or more of the several Initial
Purchasers shall fail or refuse to purchase Securities that it or they have agreed to purchase hereunder on the Closing Date, and the aggregate number of Securities which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or
refused to purchase does not exceed 10% of the aggregate number of the Securities to be purchased on such date, the other Initial Purchasers shall be obligated, severally, in the proportions that the number of Securities set forth opposite their
respective names on Schedule A bears to the aggregate number of Securities set forth opposite the names of all such non-defaulting Initial Purchasers, or in such other proportions as may be specified by
the Initial Purchasers with the consent of the non-defaulting Initial Purchasers, to purchase the Securities which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or refused to
purchase on the Closing Date. If any one or more of the Initial Purchasers shall fail or refuse to purchase Securities and the aggregate number of Securities with respect to which such default occurs exceeds 10% of the aggregate number of Securities
to be purchased on the Closing Date, and arrangements satisfactory to the Initial Purchasers and the Company for the purchase of such Securities are not made within 48 hours after such default, this Agreement shall terminate without liability of any
party (other than the defaulting Initial Purchasers) to any other party except that the provisions of Sections 4, 6, 8 and 9 hereof shall at all times be effective and shall survive such termination. In any such case either the Initial
Purchasers or the Company shall have the right to postpone the Closing Date, as the case may be, but in no event for longer than seven days in order that the required changes, if any, to the Final Offering Memorandum or any other documents or
arrangements may be effected. 
 As used in this Agreement, the term “Initial Purchaser” shall be deemed to include any
person substituted for a defaulting Initial Purchaser under this Section 17. Any action taken under this Section 17 shall not relieve any defaulting Initial Purchaser from liability in respect of any default of such Initial Purchaser under
this Agreement. 
 SECTION 18. No Advisory or Fiduciary Responsibility. Each of the Company and the Guarantors acknowledges and
agrees that: (i) the purchase and sale of the Securities pursuant to this Agreement, including the determination of the offering price of the Securities and any related discounts and commissions, is an
arm’s-length commercial transaction between the Company and the Guarantors, on the one hand, and the several Initial Purchasers, on the other hand, and the Company and the Guarantors are capable of
evaluating and understanding and understands and accepts the terms, risks and conditions of the transactions contemplated by this Agreement; (ii) in connection with each transaction contemplated hereby and the process leading to such
transaction each Initial Purchaser is and has been acting solely as a principal and is not the agent or fiduciary of the Company, and the Guarantors or their respective affiliates, stockholders, creditors or employees or any other party;
(iii) no Initial Purchaser has assumed or will assume an advisory or fiduciary responsibility in favor of the Company and the Guarantors with respect to any of the transactions contemplated hereby or the process leading thereto (irrespective


  
 29 








 
of whether such Initial Purchaser has advised or is currently advising the Company and the Guarantors on other matters) or any other obligation to the Company and the Guarantors except the
obligations expressly set forth in this Agreement; (iv) the several Initial Purchasers 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
Guarantors, and the several Initial Purchasers have no obligation to disclose any of such interests by virtue of any fiduciary or advisory relationship; and (v) the Initial Purchasers have not provided any legal, accounting, regulatory or tax
advice with respect to the offering contemplated hereby, and the Company and the Guarantors have consulted their own legal, accounting, regulatory and tax advisors to the extent they deemed appropriate. 

This Agreement supersedes all prior agreements and understandings (whether written or oral) between the Company, the Guarantors and the
several Initial Purchasers, or any of them, with respect to the subject matter hereof. The Company and the Guarantors hereby waive and release, to the fullest extent permitted by law, any claims that the Company and the Guarantors may have against
the several Initial Purchasers with respect to any breach or alleged breach of fiduciary duty. 
 SECTION 19. Compliance with USA Patriot
Act. In accordance with the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)), the Initial Purchasers 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 Initial Purchasers to properly identify
their respective clients. 
 SECTION 20. General Provisions. This Agreement constitutes the entire agreement of the parties to this
Agreement and supersedes all prior written or oral and all contemporaneous oral agreements, understandings and negotiations with respect to the subject matter hereof. This Agreement may be executed in two or more counterparts, each one of which
shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. Delivery of an executed counterpart of a signature page to this Agreement by telecopier, facsimile or other electronic transmission
(i.e., a “pdf” or “tif”) shall be effective as delivery of a manually executed counterpart thereof. This Agreement may not be amended or modified unless in writing by all of the parties hereto, and no condition herein (express or
implied) may be waived unless waived in writing by each party whom the condition is meant to benefit. The section headings herein are for the convenience of the parties only and shall not affect the construction or interpretation of this Agreement.

 [Signature Pages Follow] 

  
 30 








 If the foregoing is in accordance with your understanding of our agreement, kindly sign and
return to the Company the enclosed copies hereof, whereupon this instrument, along with all counterparts hereof, shall become a binding agreement in accordance with its terms. 

Very truly yours, 
  

					
	COMPANY
	
	BILL BARRETT CORPORATION
		
	By:	 	 /s/ William M. Crawford

		 	Name:	 	William M. Crawford
		 	Title:	 	Senior Vice President – Treasury and Finance
	
	GUARANTORS
	
	CIRCLE B LAND COMPANY LLC
		
	By:	 	 /s/ William M. Crawford

		 	Name:	 	William M. Crawford
		 	Title:	 	Senior Vice President – Treasury and Finance
	
	AURORA GATHERING, LLC
		
	By:	 	 s/ William M. Crawford

		 	Name:	 	William M. Crawford
		 	Title:	 	Senior Vice President – Treasury and Finance



  
 [Signature Page to
Purchase Agreement] 








 The foregoing Purchase Agreement is hereby confirmed and accepted by the Initial Purchasers as of
the date first above written. 
 MERRILL LYNCH, PIERCE, FENNER & SMITH
INCORPORATED 

			
		
	By:	 	 /s/ J. Lex Maultsby

	Name:	 	J. Lex Maultsby
	Title:	 	Managing Director


  
 [Signature Page to
Purchase Agreement] 








 SCHEDULE A 
  

					
	 Initial Purchasers
	  	Aggregate Principal
Amount of
Securities to be
Purchased	 
	 Merrill Lynch, Pierce, Fenner & Smith Incorporated
	  	$	99,000,000	 
	 J.P. Morgan Securities LLC
	  	 	27,500,000	 
	 BMO Capital Markets Corp.
	  	 	16,500,000	 
	 Citigroup Global Markets Inc.
	  	 	16,500,000	 
	 Deutsche Bank Securities Inc.
	  	 	16,500,000	 
	 Wells Fargo Securities, LLC
	  	 	16,500,000	 
	 Lazard Freres & Co. LLC
	  	 	11,000,000	 
	 BBVA Securities Inc.
	  	 	8,250,000	 
	 Comerica Securities, Inc.
	  	 	8,250,000	 
	 Scotia Capital (USA) Inc.
	  	 	8,250,000	 
	 Santander Investment Securities Inc.
	  	 	8,250,000	 
	 U.S. Bancorp Investments, Inc.
	  	 	8,250,000	 
	 Barclays Capital Inc.
	  	 	2,750,000	 
	 BOK Financial Securities, Inc.
	  	 	2,750,000	 
	 Coker & Palmer, Inc.
	  	 	2,750,000	 
	 Goldman, Sachs & Co.
	  	 	2,750,000	 
	 Johnson Rice & Company L.L.C.
	  	 	2,750,000	 
	 KeyBanc Capital Markets Inc.
	  	 	2,750,000	 
	 KLR Group, LLC
	  	 	2,750,000	 
	 Ladenburg Thalmann & Co. Inc.
	  	 	2,750,000	 
	 Macquarie Capital (USA) Inc.
	  	 	2,750,000	 
	 Seaport Global Securities LLC
	  	 	2,750,000	 
	 Wunderlich Securities, Inc.
	  	 	2,750,000	 
	 Total
	  	$	275,000,000	 








 SCHEDULE B 

Subsidiaries 
  

									
	Entity	  	 	  	State of Formation	  	 	  	 
	Circle B Land Company LLC	  	Colorado	  		  	
	Aurora Gathering, LLC	  		  	Texas     	  		  	

 Unknown 

  
 SCHEDULE B-1 








 EXHIBIT A 

Pricing Supplement dated April 25, 2017 

to 
 Preliminary Offering
Memorandum dated April 24, 2017 
  
 



 
 Bill Barrett Corporation 

$275,000,000 
 8.75% Senior Notes due 2025 

Final Term Sheet 
 The following
Term Sheet dated April 25, 2017 relates to the Preliminary Offering Memorandum dated April 24, 2017 of Bill Barrett Corporation. This Term Sheet is qualified in its entirety by reference to the Preliminary Offering Memorandum. The
information in this Term Sheet supplements the Preliminary Offering Memorandum and supersedes the information in the Preliminary Offering Memorandum to the extent it is inconsistent with the information in the Preliminary Offering Memorandum.
Capitalized terms used in this Term Sheet but not defined have the meanings given them in the Preliminary Offering Memorandum. 
  

					
	Issuer	  	Bill Barrett Corporation
		
	Principal Amount	  	$275,000,000
		
	Title of Securities	  	8.75% Senior Notes due 2025 (the “Notes”)
		
	Maturity	  	June 15, 2025
		
	Offering Price	  	100.000%
		
	Coupon	  	8.75%
		
	Yield-to-Maturity	  	8.75%
		
	Net Proceeds Before Expenses	  	$270.9 million
		
	Estimated Expenses	  	$0.6 million
		
	Interest Payment Dates	  	June 15 and December 15
		
	Record Dates:	  	June 1 and December 1
		
	First Interest Payment Date	  	December 15, 2017
		
	Make-Whole Redemption	  	Make-whole redemption at Treasury Rate + 50 basis points prior to June 15, 2020
		
	Optional Redemption	  	On or after June 15, 2020, at the following redemption prices (expressed as a percentage of principal amount), plus accrued and unpaid interest, if any, on the Notes redeemed during the twelve-month period indicated
beginning on June 15 of the years indicated below:

  

					
	 Year
	  	Price	 
	 2020
	  	 	106.563	% 
	 2021
	  	 	104.375	% 
	 2022
	  	 	102.188	% 
	 2023 and thereafter
	  	 	100.000	% 



  
 Exhibit A-1 









			
	Equity Clawback	  	Up to 35% at 108.75% prior to June 15, 2020
		
	Change of Control	  	101% plus accrued and unpaid interest
		
	Joint Bookrunning Managers	  	 Merrill Lynch, Pierce, Fenner & Smith

                      Incorporated

J.P. Morgan Securities LLC
 BMO Capital Markets Corp.

Citigroup Global Markets Inc.
 Deutsche Bank Securities

Wells Fargo Securities, LLC

		
	Co-Managers	  	 Lazard Frères & Co. LLC
 BBVA
Securities Inc.
 Comerica Securities, Inc.
 Scotia Capital
(USA) Inc.
 Santander Investment Securities Inc.
 U.S. Bancorp
Investments, Inc.
 Barclays Capital Inc.
 BOK Financial
Securities, Inc.
 Coker & Palmer, Inc.
 Goldman,
Sachs & Co.
 Johnson Rice & Company L.L.C.

KeyBanc Capital Markets Inc.
 KLR Group, LLC

Ladenburg Thalmann & Company
 Macquarie Capital (USA)
Inc.
 Seaport Global Securities LLC
 Wunderlich Securities,
Inc.

		
	Trade Date	  	April 25, 2017
		
	Settlement Date	  	April 28, 2017 (T+3)
		
	Distribution	  	144A/Regulation S with Registration Rights
		
	CUSIP Numbers	  	 Rule 144A: 06846N AE4
 Regulation S: U0684N
AA7

		
	ISIN Numbers	  	 Rule 144A: US06846NAE40
 Regulation S:
USU0684NAA73

		
	Denominations	  	Minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof

  
  

The Preliminary Offering Memorandum is hereby revised to reflect the following, as well as additional conforming changes
consistent with the changes described below. 
 Description of the notes—Definitions 

The following changes shall be made to clause (2) of the definition of “Permitted Indebtedness”: 

“(2) Indebtedness of the Issuer or any Restricted Subsidiary incurred pursuant to the Credit Facilities; provided, however, that immediately after
giving effect to the incurrence of Indebtedness under the Credit Facilities, the aggregate principal amount of all Indebtedness incurred under this clause (2) and then outstanding does not exceed the greater of  (i)
$1.0 billion and (ii) an amount equal to the sum of (A) $400.0 million plus (B) 30% of Adjusted Consolidated Net
Tangible Assets determined as of the date of 

  
 Exhibit A-2 








 
the incurrence of such Indebtedness (i) $450.0 million and (ii) the Borrowing Base under
the Senior Credit Facility as in effect as of the date of such incurrence; provided, that any Indebtedness incurred under this clause (2) must be secured on a basis that is or would be pari passu with the Senior
Credit Facility as in effect on the date of the Indenture;” 
 The following definition shall be added to the Description of the Notes: 

““Borrowing Base” means the “Borrowing Base” as defined in and as determined from time to time pursuant to the Senior Credit
Facility; provided that the Borrowing Base under such Credit Facility is determined on a basis substantially consistent with customary terms for oil and gas secured reserve based loan transactions and has a lender group that includes one or more
commercial financial institutions which engage in oil and gas reserve based lending in the ordinary course of their respective businesses.” 
 The term
“Credit Facilities” is hereby replaced in its entirety as follows: 
 ““Credit Facility” means, with respect to the Issuer
or any Restricted Subsidiary, one or more debt facilities (or other financing arrangement (including, without limitation, the Senior Credit Facility, commercial paper facilities, letters of credit facilities, bankers’ acceptances or
indentures), in each case with banks or other institutional lenders that engage in making bank loans or similar extensions of credit in the ordinary course, providing for revolving credit loans, term loans, letters of credit, bankers’
acceptances or other borrowings, in each case, as amended, restated, modified, renewed, extended, refunded, replaced (whether upon or after termination or otherwise) or refinanced (in each case, without limitation as to amount), in whole or in part,
from time to time; provided that any Credit Facility includes assignment provisions substantially similar to the assignment provisions contained in the Senior Credit Facility as in effect on the date of the Indenture.” 

The term “Measurement Date” is hereby replaced in its entirety as follows: 

““Measurement Date” means March 31, 2017.” 

The term “Senior Credit Facility” is hereby replaced in its entirety as follows: 

““Senior Credit Facility” means the debt facility provided for under the Third Amended and Restated Credit Agreement dated as of
March 16, 2010 among Bill Barrett Corporation, as borrower, JPMorgan Chase Bank, N.A., as administrative agent, Bank of America, N.A. and Deutsche Bank Securities Inc., as syndication agents, Bank of Montreal and Wells Fargo Bank, N.A., as
documentation agents and the lenders party thereto, or any successor or replacement agreements and whether by the same or any other agent, lender or group of lenders, together with the related documents thereto (including, without limitation, any
guarantee agreements and security documents), in each case as such agreements may be amended (including any amendment and restatement thereof), supplemented or otherwise modified from time to time, including any agreements extending the maturity of,
Refinancing, replacing, increasing or otherwise restructuring all or any portion of the Indebtedness under such agreements (provided that any increase in borrowings is permitted under clause (2) of the
definition of “Permitted Indebtedness”).” 
  

 
 This material is strictly
confidential and has been prepared by the Issuer solely for use in connection with the proposed offering of the securities described in the Preliminary Offering Memorandum. This material is personal to each offeree and does not constitute an offer
to any other person or the public generally to subscribe for or otherwise acquire the securities. Please refer to the Preliminary Offering Memorandum for a complete description. 

The securities have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or the securities laws of any other
jurisdiction, and are being offered only to (1) “qualified institutional buyers” as defined in Rule 144A under the Securities Act and (2) outside the United States to non-U.S. persons in
compliance with Regulation S under the Securities Act, and this communication is only being distributed to such persons. The securities described in the Preliminary Offering Memorandum may not be offered or sold in the United States or to U.S.
persons (as defined in Regulation S under the Securities Act) except in transactions exempt from, or not subject to, the registration requirements of the Securities Act. 

This communication is not an offer to sell the securities and it is not a solicitation of an offer to buy the securities in any jurisdiction to any person
to whom it is unlawful to make such offer or soliciation in such jurisdiction. 
 Any disclaimers or notices that may appear on this
Term Sheet below the text of this legend are not applicable to this Term Sheet and should be disregarded. Such disclaimers may have been electronically generated as a result of this Term Sheet having been sent via, or posted on, Bloomberg or another
electronic mail system. 

  
 Exhibit A-3