Document:

First Supplemental Indenture

 EXHIBIT 4.2 

EXECUTION VERSION 

UNIT CORPORATION, 
 THE SUBSIDIARY GUARANTORS PARTIES HERETO 
 AND 

WILMINGTON TRUST, NATIONAL ASSOCIATION 
 as TRUSTEE 
  

 
 FIRST
SUPPLEMENTAL INDENTURE 
 Dated as of July 24, 2012 

 
  

$400,000,000 
 6 5/8 % Senior Subordinated Notes due 2021 

 TABLE OF CONTENTS 

 
  

 

					
	  	  	PAGE	 
	ARTICLE 1	  
	6 5/8 % SENIOR SUBORDINATED NOTES DUE 2021	  
		
	 Section 1.01. Establishment
	  	 	2	  
	 Section 1.02. Definitions
	  	 	2	  
	 Section 1.03. Payment of Principal and Interest
	  	 	43	  
	 Section 1.04. Denominations
	  	 	45	  
	 Section 1.05. Global Securities
	  	 	45	  
	 Section 1.06. Transfer
	  	 	45	  
	 Section 1.07. Defeasance
	  	 	45	  
	 Section 1.08. Redemption at the Option of the Company
	  	 	45	  
	 Section 1.09. Special Mandatory Redemption
	  	 	47	  
	 Section 1.10 Paying Agent
	  	 	48	  
	 Section 1.11. Additional Notes
	  	 	48	  
	 Section 1.12 Restrictions on Transfer and Exchange
	  	 	48	  
	
	ARTICLE 2	  
	SUBSIDIARY GUARANTEES	  
		
	 Section 2.01. Guarantee
	  	 	50	  
	 Section 2.02. Limitation on Subsidiary Guarantor Liability
	  	 	52	  
	 Section 2.03. Releases of Subsidiary Guarantees
	  	 	52	  
	
	ARTICLE 3	  
	PARTICULAR COVENANTS OF THE COMPANY WITH RESPECT
TO THE NOTES	  
		
	 Section 3.01. Effectiveness of Covenants
	  	 	53	  
	 Section 3.02. Limitation on Indebtedness
	  	 	53	  
	 Section 3.03. Limitation on Layering
	  	 	58	  
	 Section 3.04. Limitation on Restricted Payments
	  	 	59	  
	 Section 3.05. Limitation on Liens
	  	 	64	  
	 Section 3.06. Limitation on Restrictions on Distributions from Restricted Subsidiaries
	  	 	65	  
	 Section 3.07. Limitation on Sales of Assets and Subsidiary Stock
	  	 	68	  
	 Section 3.08. Limitation on Affiliate Transactions
	  	 	71	  
	 Section 3.09. SEC Reports
	  	 	73	  
	 Section 3.10. Merger and Consolidation
	  	 	73	  
	 Section 3.11. Future Subsidiary Guarantors
	  	 	75	  
	 Section 3.12. Limitation on Lines of Business
	  	 	75	  

  
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	 Section 3.13. Payments for Consent
	  	 	75	  
	 Section 3.14. Offer to Repurchase Upon Change of Control
	  	 	75	  
	
	ARTICLE 4	  
	EVENTS OF DEFAULT WITH RESPECT TO THE
NOTES	  
		
	 Events Of Default With Respect To The Notes
	  	 	77	  
	
	ARTICLE 5	  
	MODIFICATION AND WAIVER	  
		
	 Section 5.01. Without Consent of Holders of Notes
	  	 	79	  
	 Section 5.02. With Consent of Holders of Notes
	  	 	79	  
	
	ARTICLE 6	  
	MISCELLANEOUS PROVISIONS	  
		
	 Section 6.01. Recitals by the Company
	  	 	80	  
	 Section 6.02. Ratification and Incorporation of Original Indenture
	  	 	81	  
	 Section 6.03. Executed in Counterparts
	  	 	81	  
	 Section 6.04. NEW YORK LAW TO GOVERN
	  	 	81	  
	 Section 6.05. Successors and Assigns
	  	 	81	  
	 Section 6.06. Separability
	  	 	81	  

  

					
	 Exhibit A Form of Global Security
	  	 	A-1	  
	 Exhibit B Form of Supplemental Indenture to be Delivered by Subsequent Guarantors
	  	 	B-1	  
	 Exhibit C Restricted Legend
	  	 	C-1	  
	 Exhibit D Regulation S Certificate
	  	 	D-1	  
	 Exhibit E Rule 144A Certificate
	  	 	E-1	  

  
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 THIS FIRST SUPPLEMENTAL INDENTURE is made as of the 24th day of July, 2012, by and among
UNIT CORPORATION, a Delaware corporation (the “Company”), the Subsidiary Guarantors (as herein defined) parties hereto (each, a “Subsidiary Guarantor” and, collectively, the “Subsidiary Guarantors”)
and WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association duly organized and existing under the laws of the United States of America, as trustee (the “Trustee”): 

WHEREAS, the Company and the Trustee executed and delivered an Indenture, dated as of July 24, 2012 (the “Original
Indenture”), to provide for the issuance by the Company from time to time of unsecured debentures, notes, and other evidences of indebtedness (the “Debt Securities”), to be issued in one or more series as provided in the
Original Indenture; 
 WHEREAS, the Original Indenture is incorporated herein by this reference and the Original Indenture, as
supplemented by this First Supplemental Indenture, is herein called the “Indenture”; 
 WHEREAS, under the
Original Indenture, a new series of Debt Securities may at any time be established by the Board of Directors of the Company in accordance with the provisions of the Original Indenture and the terms of such series may be described by a supplemental
indenture executed by the Company and the Trustee; 
 WHEREAS, the Company proposes to create under the Indenture a new series
of Debt Securities; 
 WHEREAS, additional Debt Securities of other series hereafter established, except as may be limited in
the Original Indenture as at the time supplemented and modified, may be issued from time to time pursuant to the Indenture as at the time supplemented and modified, and all Debt Securities issued by the Company of any one series need not be issued
at the same time and, unless otherwise so provided, may be reopened for issuances of additional Debt Securities of such series; and 
 WHEREAS, all conditions necessary to authorize the execution and delivery of this First Supplemental Indenture and make it a valid and binding obligation of the Company and the Subsidiary Guarantors, in
accordance with its terms, have been done or performed. 
 NOW THEREFORE, in consideration of the agreements and obligations set
forth herein and for other good and valuable consideration, the sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows: 

 ARTICLE 1 

6 5/8 %
 SENIOR SUBORDINATED NOTES DUE 2021 
 Section 1.01.
Establishment. 
 There is hereby established a new series of Debt Securities to be issued under the
Indenture, to be designated as the Company’s 6 5/8 % Senior Subordinated Notes due 2021 (the “Notes”). 

There are to be authenticated and delivered Notes, initially limited in aggregate principal amount of $400,000,000 and no further Notes
shall be authenticated and delivered except as provided by the terms of the Original Indenture and the terms of this First Supplemental Indenture; provided, however, that the aggregate principal amount of the Notes may be increased in
the future, without the consent of the holders of the Notes, on the same terms and with the same CUSIP and ISIN numbers as the Notes. The Notes shall be issued in fully registered form without coupons. 

The Notes shall be issued in the form of one or more Global Securities (as defined below) in substantially the form set out in Exhibit A
hereto. The initial Depositary with respect to the Notes shall be The Depository Trust Company. 
 Each Note shall be dated the
date of authentication thereof and shall bear interest from May 15, 2012. 
 Section 1.02. Definitions. To the
extent any term is defined in both the First Supplemental Indenture and the Original Indenture, the definition provided in the Original Indenture shall be deemed to be deleted in its entirety and replaced by the meaning specified in the First
Supplemental Indenture. The following defined terms used herein with respect to the Notes shall, unless the context otherwise requires, have the meanings specified below. Capitalized terms used herein for which no definition is provided herein shall
have the meanings set forth in the Original Indenture. 
 “2011 Indenture” means the indenture dated as of
May 18, 2011, between the Company and Wilmington Trust, National Association (formerly Wilmington Trust FSB), as trustee, as supplemented by the first supplemental indenture dated as of May 18, 2011 among the Company, the guarantors named
therein and Wilmington Trust, National Association (formerly Wilmington Trust FSB), as further supplemented, amended or otherwise modified from time to time. 
 “Acquired Indebtedness” means Indebtedness (i) of a Person or any of its Subsidiaries existing at the time such Person becomes or is merged with and into a Restricted Subsidiary or
(ii) assumed in connection with the acquisition of assets from such Person, in each case whether or not Incurred by such Person in 

  
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connection with, or in anticipation or contemplation of, such Person becoming a Restricted Subsidiary or such acquisition. Acquired Indebtedness shall be deemed to have been Incurred, with
respect to clause (i) of the preceding sentence, on the date such Person becomes or is merged with and into a Restricted Subsidiary and, with respect to clause (ii) of the preceding sentence, on the date of consummation of such acquisition
of assets. 
 “Additional Assets” means: 

(1) any property or assets (other than Indebtedness and Capital Stock) to be used by the Company or a Restricted Subsidiary in the Oil and
Gas Business; 
 (2) capital expenditures by the Company or a Restricted Subsidiary in the Oil and Gas Business; 

(3) the Capital Stock of a Person that becomes a Restricted Subsidiary as a result of the acquisition of such Capital Stock by the Company
or a Restricted Subsidiary; or 
 (4) Capital Stock constituting a minority interest in any Person that at such time is a
Restricted Subsidiary; 
 provided, however, that, in the case of clauses (3) and (4), such Restricted Subsidiary is
primarily engaged in the Oil and Gas Business. 
 “Additional Interest” has the meaning set forth in the
Registration Rights Agreement. 
 “Adjusted Consolidated Net Tangible Assets” means (without duplication), as
of the date of determination, the remainder of: 
  

	 	(a)	the sum of: 

  

	 	(i)	estimated discounted future net revenues from proved oil and gas reserves of the Company and its Restricted Subsidiaries calculated in accordance with SEC guidelines
before any provincial, territorial, state, federal or foreign income taxes, as estimated by the Company in a reserve report prepared as of the end of the Company’s most recently completed fiscal year for which audited financial statements are
available, as increased by, as of the date of determination, the estimated discounted future net revenues from 

  
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	 	(A)	estimated proved oil and gas reserves acquired since such year end, which reserves were not reflected in such year end reserve report, and 

 

	 	(B)	estimated oil and gas reserves attributable to upward revisions of estimates of proved oil and gas reserves since such year end due to exploration, development,
exploitation or other activities, in each case calculated in accordance with SEC guidelines (utilizing the prices for the fiscal quarter ending prior to the date of determination), and decreased by, as of the date of determination, the estimated
discounted future net revenues from 

  

	 	(C)	estimated proved oil and gas reserves included therein that shall have been produced or disposed of since such year end, and 

 

	 	(D)	estimated oil and gas reserves included therein that are subsequently removed from the proved oil and gas reserves of the Company and its Restricted Subsidiaries as so
calculated due to downward revisions of estimates of proved oil and gas reserves since such year end due to changes in geological conditions or other factors which would, in accordance with standard industry practice, cause such revisions, in each
case calculated on a pre-tax basis and substantially in accordance with SEC guidelines (utilizing the prices for the fiscal quarter ending prior to the date of determination), in each case as estimated by the Company’s petroleum engineers or
any independent petroleum engineers engaged by the Company for that purpose; 

  

	 	(ii)	the capitalized costs that are attributable to oil and gas properties of the Company and its Restricted Subsidiaries to which no proved oil and gas reserves are
attributable, based on the Company’s books and records as of a date no earlier than the date of the Company’s latest available consolidated annual or quarterly financial statements; 

 

	 	(iii)	the Net Working Capital on a date no earlier than the date of the Company’s latest annual or quarterly consolidated financial statements; and

  
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	 	(iv)	the greater of 

  

	 	(A)	the net book value of other tangible assets of the Company and its Restricted Subsidiaries, as of a date no earlier than the date of the Company’s latest annual or
quarterly consolidated financial statement, and 

  

	 	(B)	the appraised value, as estimated by independent appraisers, of other tangible assets of the Company and its Restricted Subsidiaries, as of a date no earlier than the
date of the Company’s latest audited financial statements (provided that the Company shall not be required to obtain any appraisal of any assets); minus 

 

	 	(b)	the sum of: 

  

	 	(i)	any amount included in (a)(i) through (a)(iv) above that is attributable to Minority Interests; 

 

	 	(ii)	any net gas balancing liabilities of the Company and its Restricted Subsidiaries reflected in the Company’s latest audited consolidated financial statements;

  

	 	(iii)	to the extent included in (a)(i) above, the estimated discounted future net revenues, calculated in accordance with SEC guidelines (utilizing the prices utilized in the
Company’s year end reserve report), attributable to reserves which are required to be delivered to third parties to fully satisfy the obligations of the Company and its Restricted Subsidiaries with respect to Volumetric Production Payments
(determined, if applicable, using the schedules specified with respect thereto); and 

  

	 	(iv)	to the extent included in (a)(i) above, the estimated discounted future net revenues, calculated in accordance with SEC guidelines, attributable to reserves subject to
Dollar-Denominated Production Payments which, based on the estimates of production and price assumptions included in determining the estimated discounted future net revenues specified in (a)(i) above, would be necessary to fully satisfy the payment
obligations of the Company and its Restricted Subsidiaries with respect to Dollar-Denominated Production Payments (determined, if applicable, using the schedules specified with respect thereto). 

  
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 “Affiliate” of any specified Person means any other Person, that directly
or indirectly, is in Control of, is Controlled by, or is under common Control with, such Person. 
 “Applicable
Premium” means, with respect to a Note at any Redemption Date, the greater of (i) 1.0% of the principal amount of such Note and (ii) the excess of (A) the present value at such time of (1) the redemption price of such
Note at May 15, 2016 (expressed as a percentage of principal amount) plus (2) all required interest payments due on such Note through May 15, 2016, computed using a discount rate equal to the Treasury Rate plus 50 basis points, over
(B) the then outstanding principal amount of such Note. 
 “Asset Disposition” means any direct or
indirect sale, lease (other than an operating lease entered into in the ordinary course of the Oil and Gas Business), transfer, issuance or other disposition, or a series of related sales, leases, transfers, issuances or dispositions that are part
of a common plan, of shares of Capital Stock of a Subsidiary (other than directors’ qualifying shares), property or other assets (each referred to for the purposes of this definition as a “disposition”) by the Company or any of
its Restricted Subsidiaries, in each case outside the ordinary course of business including any disposition by means of a merger, consolidation or similar transaction. 
 Notwithstanding the preceding, the following items shall not be deemed to be Asset Dispositions: 
 (1) a disposition by a Restricted Subsidiary to the Company or by the Company or a Restricted Subsidiary to a Restricted Subsidiary; 

(2) the disposition of cash or Cash Equivalents in the ordinary course of business; 

(3) a disposition of Hydrocarbons or mineral products in the ordinary course of the Oil and Gas Business; 

(4) a disposition of obsolete or worn out equipment or equipment that is no longer useful in the conduct of the business of the Company
and its Restricted Subsidiaries and that is disposed of in each case in the ordinary course of business; 
 (5) transactions
permitted by Section 3.10 of this First Supplement Indenture; 

  
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 (6) an issuance of Capital Stock by a Restricted Subsidiary to the Company or to a
Wholly-Owned Subsidiary; 
 (7) for purposes of Section 3.07 of this First Supplemental Indenture only, the making of a
Permitted Investment or a disposition subject to Section 3.04 of this First Supplemental Indenture; 
 (8) dispositions of
assets with an aggregate fair market value since the Issue Date of less than $10 million; 
 (9) dispositions in connection with
the creation, encumbrance or existence of Permitted Liens or the exercise of any rights or remedies with respect thereof; 
 (10)
dispositions of receivables in connection with the compromise, settlement or collection thereof in the ordinary course of business or in bankruptcy or similar proceedings and exclusive of factoring or similar arrangements; 

(11) the licensing or sublicensing of intellectual property or other general intangibles and licenses, leases or subleases of other
property in the ordinary course of business and which do not materially interfere with the business of the Company and its Restricted Subsidiaries; 
 (12) any Production Payments and Reserve Sales, provided that any such Production Payments and Reserve Sales, other than incentive compensation programs on terms that are reasonably customary in
the Oil and Gas Business for geologists, geophysicists and other providers of technical services to the Company or a Restricted Subsidiary, shall have been created, Incurred, issued, assumed or Guaranteed in connection with the acquisition or
financing of, and no later than 60 days after the acquisition of, the property that is subject thereto; 
 (13) the sale or
transfer (whether or not in the ordinary course of the Oil and Gas Business) of oil and/or gas properties or direct or indirect interests in real property; provided, that at the time of such sale or transfer such properties do not have associated
with them any proved reserves capable of being produced in material economic quantities; 
 (14) the abandonment, farm-out,
exchange, lease or sublease of developed or undeveloped oil and/or gas properties or interests therein in the ordinary course of business or in exchange for oil and/or gas properties or interests therein owned or held by another Person; 

(15) an Asset Swap effected in compliance with the covenant described under Section 3.07 hereof; 

  
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 (16) a disposition of oil and natural gas properties in connection with tax credit
transactions complying with Section 29 or any successor or analogous provisions of the Code; 
 (17) surrender or waiver of
contract rights, oil and gas leases, or the settlement, release or surrender of contract, tort or other claims of any kind; and 

(18) Permitted Liens. 
 “Asset Swap” means a substantially concurrent purchase and sale or exchange of oil and gas properties or interests therein or other assets or properties used or useful in the Oil and Gas
Business, including Capital Stock of any Person who holds any such properties, interests or assets, between the Company or any of its Restricted Subsidiaries and another Person; provided that any cash received must be applied in accordance
with Section 3.07 of this First Supplemental Indenture 
 “Attributable Indebtedness” in respect of a
Sale/Leaseback Transaction means, as at the time of determination, the present value (discounted at the interest rate borne by the Notes, compounded semi-annually) of the total obligations of the lessee for rental payments during the remaining term
of the lease included in such Sale/Leaseback Transaction (including any period for which such lease has been extended). 

“Average Life” means, as of the date of determination, with respect to any Indebtedness or Preferred Stock, the quotient
obtained by dividing (1) the sum of the products of the numbers of years from the date of determination to the dates of each successive scheduled principal payment of such Indebtedness or redemption or similar payment with respect to such
Preferred Stock multiplied by the amount of such payment by (2) the sum of all such payments. 
 “Bank
Indebtedness” means any and all amounts, whether outstanding on the Issue Date or Incurred after the Issue Date, payable by the Company under or in respect of a Credit Facility, including the Senior Credit Agreement, and any related notes,
collateral documents, letters of credit and guarantees and any Interest Rate Agreement entered into in connection with the Credit Facility, including principal, premium, if any, interest (including interest accruing on or after the filing of any
petition in bankruptcy or for reorganization relating to the Company at the rate specified therein, whether or not a claim for post-filing interest is allowed in such proceedings), fees, charges, expenses, reimbursement obligations, guarantees and
all other amounts payable thereunder or in respect thereof. 
 “Board of Directors” means, as to any Person,
the board of directors of such Person or a duly authorized committee of such board of directors. 

  
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 “Capital Lease” means, with respect to any Person, any lease of property
(whether real, personal, or mixed) by such Person or its Subsidiaries as lessee that would be capitalized on a balance sheet of such Person or its Subsidiaries prepared in conformity with GAAP, other than, in the case of such Person or its
Subsidiaries, any such lease under which such Person or any of its Subsidiaries is the lessor. 
 “Capital Lease
Obligations” means, with respect to any Person, the capitalized amount of all obligations of such Person and its Subsidiaries under Capital Leases, as determined on a consolidated basis in conformity with GAAP. 

“Capital Stock” of any Person means any and all shares, interests, rights to purchase, warrants, options, participation
or other equivalents of or interests in (however designated) equity of such Person, including any Preferred Stock, but excluding any debt securities convertible into such equity. 

“Cash Equivalents” means: 
 (1) securities issued or directly and fully guaranteed or insured by the United States Government or any agency or instrumentality of the United States (provided that the full faith and credit of the
United States is pledged in support thereof), having a maturity within one year after the date of acquisition thereof; 
 (2)
marketable general obligations issued by any state of the United States of America or any political subdivision of any such state or any public instrumentality thereof maturing within one year after the date of acquisition thereof and, at the time
of such acquisition, having a credit rating of at least “A” or the equivalent thereof from either Standard & Poor’s Ratings Services or Moody’s Investors Service, Inc. (or an equivalent rating by another nationally
recognized rating agency if both of the two named rating agencies cease publishing ratings of investments); 
 (3) certificates
of deposit, time deposits, eurodollar time deposits, overnight bank deposits or bankers’ acceptances having maturities of not more than one year after the date of acquisition thereof issued by any commercial bank the long-term debt of which is
rated at the time of acquisition at least “A” or the equivalent thereof by Standard & Poor’s Ratings Services, or “A” or the equivalent thereof by Moody’s Investors Service, Inc. (or an equivalent rating by
another nationally recognized rating agency if both of the two named rating agencies cease publishing ratings of investments), and having combined capital and surplus in excess of $500 million; 

(4) repurchase obligations with a term of not more than seven days for underlying securities of the types described in clauses (1),
(2) and (3) above entered into with any bank meeting the qualifications specified in clause (3) above; 

  
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 (5) commercial paper rated at the time of acquisition thereof at least
“A-2” or the equivalent thereof by Standard & Poor’s Ratings Services or “P-2” or the equivalent thereof by Moody’s Investors Service, Inc. (or an equivalent rating by another nationally recognized
rating agency if both of the two named rating agencies cease publishing ratings of investments), and in any case maturing within one year after the date of acquisition thereof; and 

(6) interests in any investment company or money market fund which invests 95% or more of its assets in instruments of the type specified
in clauses (1) through (5) above. 
 “Change of Control” means: 

(1) Any “person” or “group” of related persons (as such terms are used in Sections 13(d) and 14(d) of the Exchange
Act) is or becomes the beneficial owner (as defined in Rules 13d-3 and 13d-5 under the Exchange Act, except that such person or group shall be deemed to have “beneficial ownership” of all shares that such person or group has the right to
acquire, whether such right is exercisable immediately or only after the passage of time), directly or indirectly, of more than 50% of the total voting power of the Voting Stock of the Company (or its successor by merger, consolidation or purchase
of all or substantially all of its assets) (for the purposes of this clause, such person or group shall be deemed to beneficially own any Voting Stock of the Company held by a parent entity of the Company, if such person or group “beneficially
owns” (as defined above), directly or indirectly, more than 50% of the voting power of the Voting Stock of such parent entity); or 
 (2) the first day on which a majority of the members of the Board of Directors of the Company are not Continuing Directors; or 
 (3) the sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the assets of the
Company and its Restricted Subsidiaries taken as a whole to any “person” (as such term is used in Sections 13(d) and 14(d) of the Exchange Act); or 
 (4) the adoption by the stockholders of the Company of a plan or proposal for the liquidation or dissolution of the Company. 
 “Commodity Agreements” means, in respect of any Person, any futures contract, forward contract, commodity swap agreement, commodity option agreement or other similar agreement or
arrangement in respect of Hydrocarbons purchased, used, produced, processed or sold by such Person and designed to protect such Person against fluctuations in Hydrocarbon prices. 

  
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 “Common Stock” means with respect to any Person, any and all shares,
interests or other participations in, and other equivalents (however designated and whether voting or nonvoting) of such Person’s common stock whether or not outstanding on the Issue Date, and includes, without limitation, all series and
classes of such common stock. 
 “Consolidated Coverage Ratio” means as of any date of determination, the ratio
of (x) the aggregate amount of Consolidated EBITDA for the period of the most recent four consecutive fiscal quarters ending prior to the date of such determination for which consolidated financial statements of the Company are in existence to
(y) Consolidated Interest Expense for such four fiscal quarters; provided, however, that: 
  

	 	(1)	if the Company or any Restricted Subsidiary: 

  

	 	(a)	has Incurred any Indebtedness since the beginning of such period that remains outstanding on such date of determination or if the transaction giving rise to the need to
calculate the Consolidated Coverage Ratio is an Incurrence of Indebtedness, Consolidated EBITDA and Consolidated Interest Expense for such period will be calculated after giving effect on a pro forma basis to such Indebtedness as if such
Indebtedness had been Incurred on the first day of such period (except that in making such computation, the amount of Indebtedness under any revolving credit facility outstanding on the date of such calculation will be deemed to be (i) the
average daily balance of such Indebtedness during such four fiscal quarters or such shorter period for which such facility was outstanding or (ii) if such facility was created after the end of such four fiscal quarters, the average daily
balance of such Indebtedness during the period from the date of creation of such facility to the date of such calculation) and the discharge of any other Indebtedness repaid, repurchased, defeased or otherwise discharged with the proceeds of such
new Indebtedness as if such discharge had occurred on the first day of such period; or 

  

	 	(b)	 has repaid, repurchased, defeased or otherwise discharged any Indebtedness since the beginning of the period that is no longer outstanding on such date
of determination or if the transaction giving rise to the need to calculate the Consolidated Coverage Ratio involves a discharge of Indebtedness (in each case other than Indebtedness Incurred under any revolving credit facility unless such

  
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Indebtedness has been permanently repaid and the related commitment terminated), Consolidated EBITDA and Consolidated Interest Expense for such period will be calculated after giving effect on a
pro forma basis to such discharge of such Indebtedness, including with the proceeds of such new Indebtedness, as if such discharge had occurred on the first day of such period; 

(2) if since the beginning of such period the Company or any Restricted Subsidiary shall have made any Asset Disposition or the
transaction giving rise to the need to calculate the Consolidated Coverage Ratio is such an Asset Disposition: 
  

	 	(a)	the Consolidated EBITDA for such period will be reduced by an amount equal to the Consolidated EBITDA (if positive) directly attributable to the assets which are the
subject of such Asset Disposition for such period or increased by an amount equal to the absolute value of the Consolidated EBITDA (if negative) directly attributable thereto for such period; and 

 

	 	(b)	Consolidated Interest Expense for such period will be reduced by an amount equal to the Consolidated Interest Expense directly attributable to any Indebtedness of the
Company or any Restricted Subsidiary repaid, repurchased, defeased or otherwise discharged with respect to the Company and its continuing Restricted Subsidiaries in connection with such Asset Disposition for such period (or, if the Capital Stock of
any Restricted Subsidiary is sold, the Consolidated Interest Expense for such period directly attributable to the Indebtedness of such Restricted Subsidiary to the extent the Company and its continuing Restricted Subsidiaries are no longer liable
for such Indebtedness after such sale); 

 (3) if since the beginning of such period the Company or any Restricted
Subsidiary (by merger or otherwise) shall have made an Investment in any Restricted Subsidiary (or any Person which becomes a Restricted Subsidiary or is merged with or into the Company or a Restricted Subsidiary) or an acquisition of assets,
including any acquisition of assets occurring in connection with a transaction giving rise to the need to calculate the Consolidated Coverage Ratio, which constitutes all or substantially all of a company, division, operating unit, segment,
business, group of related assets or line of business, Consolidated EBITDA and Consolidated Interest Expense for such period will be calculated after giving pro forma effect thereto (including the Incurrence of any Indebtedness) as if such
Investment or acquisition occurred on the first day of such period; and 

  
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 (4) if since the beginning of such period any Person that subsequently became a Restricted
Subsidiary or was merged with or into the Company or any Restricted Subsidiary since the beginning of such period shall have Incurred any Indebtedness or discharged any Indebtedness, made any Asset Disposition or any Investment or acquisition of
assets that would have required an adjustment pursuant to clause (2) or (3) above if made by the Company or a Restricted Subsidiary during such period, Consolidated EBITDA and Consolidated Interest Expense for such period will be
calculated after giving pro forma effect thereto as if such Asset Disposition or Investment or acquisition of assets occurred on the first day of such period. 
 For purposes of this definition, whenever pro forma effect is to be given to any calculation under this definition, the pro forma calculations will be determined in good faith by a responsible financial
or accounting officer of the Company (including pro forma expense and cost reductions calculated on a basis consistent with Regulation S-X under the Securities Act). If any Indebtedness bears a floating rate of interest and is being given pro forma
effect, the interest expense on such Indebtedness will be calculated as if the rate in effect on the date of determination had been the applicable rate for the entire period (taking into account any Interest Rate Agreement applicable to such
Indebtedness but if the remaining term of such Interest Rate Agreement is less than 12 months, then such Interest Rate Agreement shall only be taken into account for that portion of the period equal to the remaining term thereof). If any
Indebtedness that is being given pro forma effect bears an interest rate at the option of the Company, the interest rate shall be calculated by applying such optional rate chosen by the Company. 

“Consolidated EBITDA” for any period means, without duplication, the Consolidated Net Income for such period, plus the
following to the extent deducted in calculating such Consolidated Net Income: 
 (1) Consolidated Interest Expense; 

(2) Consolidated Income Taxes; 
 (3) consolidated depletion, depreciation and amortization expenses; 
 (4)
consolidated impairment charges recorded in connection with the application of GAAP codification of Accounting Standards (ASC) 350 “Goodwill and Other Intangibles” and ASC 360 “Accounting for the Impairment or Disposal of Long Lived
Assets;” 

  
 13 

 (5) consolidated exploration expenses, if applicable; 

(6) (a) any write-off of deferred financing costs, (b) any capitalized interest, and (c) the interest portion of any deferred
payment obligations; and 
 (7) other consolidated non-cash charges reducing Consolidated Net Income (excluding any such non-cash
charge to the extent it represents an accrual of or reserve for cash charges in any future period or amortization of a prepaid cash expense that was paid in a prior period not included in the calculation); 

less, to the extent included in calculating such Consolidated Net Income and in excess of any costs or expenses attributable thereto that were deducted
in calculating such Consolidated Net Income, the sum of (x) the amount of deferred revenues that are amortized during such period and are attributable to reserves that are subject to Volumetric Production Payments, and (y) amounts recorded
in accordance with GAAP as repayments of principal and interest pursuant to Dollar-Denominated Production Payments. 

Notwithstanding the preceding sentence, the items described in clauses (2) through (6) above relating to amounts of a
Restricted Subsidiary of a Person will be added to Consolidated Net Income to compute Consolidated EBITDA of such Person only to the extent (and in the same proportion) that the net income (loss) of such Restricted Subsidiary was included in
calculating the Consolidated Net Income of such Person and, to the extent the amounts set forth in clauses (2) through (6) above are in excess of those necessary to offset a net loss of such Restricted Subsidiary or if such Restricted
Subsidiary has net income for such period included in Consolidated Net Income, only if a corresponding amount would not be prohibited at the date of determination to be dividended to the Company by such Restricted Subsidiary pursuant to the terms of
its charter and all agreements, instruments, judgments, decrees, orders, statutes, rules and governmental regulations applicable to that Restricted Subsidiary or its stockholders, except for restrictions under any Credit Facility. 

“Consolidated Income Taxes” means, with respect to any Person for any period, taxes imposed upon such Person or other
payments required to be made by such Person by any governmental authority which taxes or other payments are (x) calculated by reference to the income or profits of such Person or such Person and its Subsidiaries, or (y) any franchise taxes
or equity taxes (in each case to the extent included in computing Consolidated Net Income for such period), regardless of whether such taxes or payments are required to be remitted to any governmental authority. 

“Consolidated Interest Expense” means, for any period, the consolidated interest expense of the Company and its
consolidated Restricted Subsidiaries, whether paid or accrued, plus, to the extent not included in such interest expense: 

  
 14 

 (1) interest expense attributable to Capital Lease Obligations and the interest portion of
rent expense associated with Attributable Indebtedness in respect of the relevant lease giving rise thereto, determined as if such lease were a Capital Lease in accordance with GAAP and the interest component of any deferred payment obligations;

 (2) amortization of debt discount and debt issuance cost (provided that any amortization of bond premium will be credited to
reduce Consolidated Interest Expense unless, pursuant to GAAP, such amortization of bond premium has otherwise reduced Consolidated Interest Expense); 
 (3) non-cash interest expense; 
 (4) commissions, discounts and other fees and
charges owed with respect to letters of credit and bankers’ acceptance financing; 
 (5) the interest expense on
Indebtedness of another Person that is Guaranteed by such Person or one of its Restricted Subsidiaries or secured by a Lien on assets of such Person or one of its Restricted Subsidiaries; 

(6) costs associated with Hedging Obligations (including amortization of fees) provided, however, that if Hedging
Obligations result in net benefits rather than costs, such net benefits shall be credited to reduce Consolidated Interest Expense unless, pursuant to GAAP, such net benefits are otherwise reflected in Consolidated Net Income; 

(7) the consolidated interest expense of such Person and its Restricted Subsidiaries that was capitalized during such period; 

(8) the product of (a) all dividends paid or payable, in cash, Cash Equivalents or Indebtedness or accrued during such period on any
series of Disqualified Stock of such Person or on Preferred Stock of its Restricted Subsidiaries payable to a party other than the Company or a Wholly-Owned Subsidiary, times (b) a fraction, the numerator of which is one and the denominator of
which is one minus the then current combined federal, state, provincial and local statutory tax rate of such Person, expressed as a decimal, in each case, on a consolidated basis and in accordance with GAAP; 

(9) Receivables Fees; and 
 (10) the cash contributions to any employee stock ownership plan or similar trust to the extent such contributions are used by such plan or trust to pay interest or fees to any Person (other than the
Company) in connection with Indebtedness Incurred by such plan or trust. 

  
 15 

 For the purpose of calculating the Consolidated Coverage Ratio in connection with the
Incurrence of any Indebtedness described in the final paragraph of the definition of “Indebtedness,” the calculation of Consolidated Interest Expense shall include all interest expense (including any amounts described in clauses
(1) through (10) above) relating to any Indebtedness of the Company or any Restricted Subsidiary described in the final paragraph of the definition of “Indebtedness.” 

For purposes of the foregoing, total interest expense will be determined (i) after giving effect to any net payments made or
received by the Company and its Subsidiaries with respect to Interest Rate Agreements and (ii) exclusive of amounts classified as other comprehensive income in the balance sheet of the Company. Notwithstanding anything to the contrary contained
herein, commissions, discounts, yield and other fees and charges Incurred in connection with any transaction pursuant to which the Company or its Restricted Subsidiaries may sell, convey or otherwise transfer or grant a security interest in any
accounts receivable or related assets shall be included in Consolidated Interest Expense. 
 “Consolidated Leverage
Ratio” means, as of any date of determination, the ratio of total Indebtedness of the Company and its consolidated Restricted Subsidiaries as of that date to the Company’s Consolidated EBITDA for the four full fiscal quarters
immediately preceding the determination date, with such adjustments to the amount of Indebtedness and Consolidated EBITDA as are consistent with the adjustment provisions set forth in the definition of “Consolidated Coverage Ratio.”

 “Consolidated Net Income” means, for any period, the net consolidated income (loss) of the Company and its
consolidated Subsidiaries determined in accordance with GAAP; provided, however, that there will not be included in such Consolidated Net Income: 
 (1) any net income (loss) of any Person (other than the Company) if such Person is not a Restricted Subsidiary, except that: 

 

	 	(a)	subject to the limitations contained in clauses (3), (4) and (5) below, the Company’s equity in the net income of any such Person for such period will be
included in such Consolidated Net Income up to the aggregate amount of cash actually distributed by such Person during such period to the Company or a Restricted Subsidiary as a dividend or other distribution (subject, in the case of a dividend or
other distribution to a Restricted Subsidiary, to the limitations contained in clause (2) below); and 

  
 16 

	 	(b)	the Company’s equity in a net loss of any such Person (other than an Unrestricted Subsidiary) for such period will be included in determining such Consolidated Net
Income to the extent such loss has been funded with cash from the Company or a Restricted Subsidiary; 

 (2) any
net income (but not loss) of any Restricted Subsidiary if such Subsidiary is subject to restrictions, directly or indirectly, on the payment of dividends or the making of distributions by such Restricted Subsidiary, directly or indirectly, to the
Company, except that: 
  

	 	(a)	subject to the limitations contained in clauses (3), (4) and (5) below, the Company’s equity in the net income of any such Restricted Subsidiary for such
period will be included in such Consolidated Net Income up to the aggregate amount of cash that could have been distributed by such Restricted Subsidiary during such period to the Company or another Restricted Subsidiary as a dividend (subject, in
the case of a dividend to another Restricted Subsidiary, to the limitation contained in this clause); and 

  

	 	(b)	the Company’s equity in a net loss of any such Restricted Subsidiary for such period will be included in determining such Consolidated Net Income;

 (3) any after tax gain (loss) realized upon the sale or other disposition of any property, plant or equipment of
the Company or its consolidated Restricted Subsidiaries (including pursuant to any Sale/Leaseback Transaction) which is not sold or otherwise disposed of in the ordinary course of business and any gain (loss) realized upon the sale or other
disposition of any Capital Stock of any Person; 
 (4) any after tax extraordinary gain or loss, along with any related
provisions for taxes on such gain or loss and all related fees and expenses;; 
 (5) the cumulative effect of a change in
accounting principles; 
 (6) any asset impairment writedowns on Oil and Gas Properties under GAAP or SEC guidelines; 

(7) any consolidated impairment charges recorded in connection with the application of ASC 350 “Goodwill and Other Intangibles;”

 (8) any unrealized non-cash gains or losses on charges in respect of Hedging Obligations (including those resulting from the
application of ASC 815); 

  
 17 

 (9) income or loss attributable to discontinued operations (including, without limitation.
operations disposed of during such period whether or not such operations were classified as discontinued); 
 (10) all deferred
financing costs written off, and premiums paid, in connection with any early extinguishment of Indebtedness; and 
 (11) any
non-cash compensation charge arising from any grant of stock, stock options or other equity based awards; provided that the proceeds resulting from any such grant will be excluded from clause 3(ii) of the first paragraph of the covenant described
under Section 3.04 hereof. 
 “Continuing Directors” means the individuals who, as of the Issue Date, are
directors of the Company and any individual becoming a director of the Company subsequent to the Issue Date whose election, nomination for election by the Company’s stockholders or appointment, was approved by a majority of the then Continuing
Directors (either by a specific vote or by approval of the proxy statement of the Company in which such individual is named as a nominee for election as a director, without objection to such nomination). 

“Control” of a Person means the power to direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise; and the terms “Controlling” and “Controlled” have meanings correlative of the foregoing. 

“Credit Facility” means, with respect to the Company or any Subsidiary Guarantor, one or more credit facilities
(including, without limitation, the Senior Credit Agreement) or commercial paper facilities providing for revolving credit loans, term loans, receivables financing (including through the sale of receivables to such lenders or to special purpose
entities formed to borrow from such lenders against such receivables) or letters of credit, in each case, as amended, restated, modified, renewed, refunded, replaced or refinanced in whole or in part from time to time (including successive
amendments, restatements, modifications, renewals, refunds, replacements or refinancings and whether or not with the original administrative agent and lenders or another administrative agent or agents or other lenders and whether provided under the
original Senior Credit Agreement or any other credit or other agreement or indenture). 
 “Currency Agreement”
means in respect of a Person any foreign exchange contract, currency swap agreement, futures contract, option contract or other similar agreement as to which such Person is a party or a beneficiary. 

“Default” means any event which, with notice or passage of time or both, would constitute an Event of Default.

  
 18 

 “Designated Senior Indebtedness” means (1) the Bank Indebtedness (to
the extent such Bank Indebtedness constitutes Senior Indebtedness), including the Senior Credit Agreement, and (2) any other Senior Indebtedness which, at the date of determination, has an aggregate principal amount outstanding of, or under
which, at the date of determination, the holders thereof are committed to lend up to, at least $25 million and is specifically designated in the instrument evidencing or governing such Senior Indebtedness as “Designated Senior
Indebtedness” for purposes of the Indenture. 
 “Disqualified Stock” means, with respect to any
Person, any Capital Stock of such Person which by its terms (or by the terms of any security into which it is convertible or for which it is exchangeable) or upon the happening of any event: 

(1) matures or is mandatorily redeemable pursuant to a sinking fund obligation or otherwise; 

(2) is convertible or exchangeable for Indebtedness or Disqualified Stock (excluding Capital Stock which is convertible or exchangeable
solely at the option of the Company or a Restricted Subsidiary); or 
 (3) is redeemable at the option of the holder of the
Capital Stock in whole or in part, 
 in each case on or prior to the date that is 91 days after the earlier of the date (a) of the Stated
Maturity of the Notes or (b) the first date after the Issue Date on which there are no Notes outstanding, provided that only the portion of Capital Stock which so matures or is mandatorily redeemable, is so convertible or exchangeable or
is so redeemable at the option of the holder thereof prior to such date will be deemed to be Disqualified Stock; provided, further that any Capital Stock that would constitute Disqualified Stock solely because the holders thereof have the right to
require the Company to repurchase such Capital Stock upon the occurrence of a change of control or asset disposition (each defined in a substantially identical manner to the corresponding definitions in the Indenture) shall not constitute
Disqualified Stock if the terms of such Capital Stock (and all such securities into which it is convertible or for which it is ratable or exchangeable) provide that the Company may not repurchase or redeem any such Capital Stock (and all such
securities into which it is convertible or for which it is ratable or exchangeable) pursuant to such provision prior to compliance by the Company with Section 3.07 and Section 3.14 of this First Supplemental Indenture and such repurchase
or redemption complies with Section 3.04 of this First Supplement Indenture. 

  
 19 

 “Dollar-Denominated Production Payments” means production payment
obligations recorded as liabilities in accordance with GAAP, together with all undertakings and obligations in connection therewith. 
 “Domestic Subsidiary” means any Restricted Subsidiary that is organized under the laws of the United States of America or any state thereof or the District of Columbia. 

“Events of Default” has the meaning set forth in Article 4. 

“Exchange Notes” means notes of the Company issued pursuant to the 2011 Indenture in exchange for, and in an aggregate
principal amount equal to, the Initial Notes or any Initial Additional Notes in compliance with the terms of the Registration Rights Agreement and containing terms substantially identical to the Initial Notes or any Initial Additional Notes (except
that (i) such Exchange Notes will be registered under the Securities Act, (ii) will not be subject to the Special Mandatory Redemption under Section 1.09 hereof, (iii) will not be subject to transfer restrictions or bear the
Restricted Legend and (iv) will not be subject to the provisions relating to Additional Interest). 
 “Exchange
Offer” means an offer by the Company to the Holders of the Initial Notes or any Initial Additional Notes to exchange outstanding Notes for Exchange Notes, as provided for in the Registration Rights Agreement. 

“Foreign Subsidiary” means any Restricted Subsidiary that is not organized under the laws of the United States of
America or any state thereof or the District of Columbia and any Subsidiary of such Restricted Subsidiary. 

“GAAP” means generally accepted accounting principles in the United States which are in effect from time to time. At any
time after the Issue Date, the Company may elect to apply International Financial Reporting Standards (“IFRS”) accounting principles in lieu of GAAP and, upon any such election, references herein to GAAP shall thereafter be construed to
mean IFRS from time to time; provided that any such election, once made, shall be irrevocable; provided, further, that any calculation or determination in the Indenture that requires the application of GAAP for periods that include fiscal quarters
ended prior to the Company’s election to apply IFRS shall remain as previously calculated or determined in accordance with GAAP. The Company shall give notice of any such election made in accordance with this definition to the Trustee.

 “Guarantee” means any obligation, contingent or otherwise, of any Person directly or indirectly guaranteeing
any Indebtedness of any other Person and any obligation, direct or indirect, contingent or otherwise, of such Person: 

  
 20 

 (1) to purchase or pay (or advance or supply funds for the purchase or payment of) such
Indebtedness of such other Person (whether arising by virtue of partnership arrangements, or by agreement to keep-well, to purchase assets, goods, securities or services, to take-or-pay, or to maintain financial statement conditions or otherwise);
or 
 (2) entered into for purposes of assuring in any other manner the obligee of such Indebtedness of the payment thereof or to
protect such obligee against loss in respect thereof (in whole or in part); 
 provided, however, that the term
“Guarantee” will not include endorsements for collection or deposit in the ordinary course of business. The term “Guarantee” used as a verb has a corresponding meaning. 

“Guarantor Senior Indebtedness” means, with respect to a Subsidiary Guarantor, the following obligations, whether
outstanding on the Issue Date or thereafter issued, without duplication: 
 (1) any Guarantee of the Bank Indebtedness by such
Subsidiary Guarantor and all other Guarantees by such Subsidiary Guarantor of Senior Indebtedness of the Company or Guarantor Senior Indebtedness of any other Subsidiary Guarantor; and 

(2) all obligations consisting of principal of and premium, if any, accrued and unpaid interest on, and fees and other amounts relating
to, all other Indebtedness of the Subsidiary Guarantor. Guarantor Senior Indebtedness includes interest accruing on or after the filing of any petition in bankruptcy or for reorganization relating to the Subsidiary Guarantor regardless of whether
post-filing interest is allowed in such proceeding. 
 Notwithstanding anything to the contrary in the preceding paragraph,
Guarantor Senior Indebtedness will not include: 
 (1) any Indebtedness Incurred in violation of the Indenture; 

(2) any obligations of such Subsidiary Guarantor to the Company or another Subsidiary; 

(3) any liability for federal, state, local, foreign or other taxes owed or owing by such Subsidiary Guarantor; 

(4) any accounts payable or other liability to trade creditors arising in the ordinary course of business (including Guarantees thereof or
instruments evidencing such liabilities); 

  
 21 

 (5) any Indebtedness, Guarantee or obligation of such Subsidiary Guarantor that is expressly
subordinate or junior in right of payment to any other Indebtedness, Guarantee or obligation of such Subsidiary Guarantor, including, without limitation, any Guarantor Senior Subordinated Indebtedness and Guarantor Subordinated Obligations of such
Subsidiary Guarantor; or 
 (6) any Capital Stock. 
 “Guarantor Senior Subordinated Indebtedness” means, with respect to a Subsidiary Guarantor, the obligations of such Subsidiary Guarantor under the Subsidiary Guarantee and any other
Indebtedness of such Subsidiary Guarantor (whether outstanding on the Issue Date or thereafter Incurred) that specifically provides that such Indebtedness is to rank equally in right of payment with the obligations of such Subsidiary Guarantor under
the Subsidiary Guarantee and is not expressly subordinated by its terms in right of payment to any Indebtedness of such Subsidiary Guarantor which is not Guarantor Senior Indebtedness of such Subsidiary Guarantor. 

“Guarantor Subordinated Obligation” means, with respect to a Subsidiary Guarantor, any Indebtedness of such Subsidiary
Guarantor (whether outstanding on the Issue Date or thereafter Incurred) which is expressly subordinate in right of payment to the obligations of such Subsidiary Guarantor under its Subsidiary Guarantee pursuant to a written agreement. 

“Hedging Obligations” of any Person means the obligations of such Person pursuant to any Interest Rate Agreement or
Currency Agreement or Commodity Agreement. 
 “Holder” means a Person in whose name a Note is registered in the
Security Registrar’s books. 
 “Hydrocarbons” means oil, gas, casinghead gas, drip gasoline, natural
gasoline, condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons, and all products, by-products and all other substances refined, separated, settled or derived therefrom or the processing thereof, and all other minerals and substances,
including, but not limited to, liquified petroleum gas, natural gas, kerosene, sulphur, lignite, coal, uranium, thorium, iron, geothermal steam, water, carbon dioxide, helium, and any and all other minerals, ores, or substances of value, and the
products and proceeds therefrom, including, without limitation, all gas resulting from the in-situ combustion of coal or lignite. 
 “Incur” means issue, create, assume, Guarantee, incur or otherwise become liable for; provided, however, that any Indebtedness or Capital Stock of a Person existing at the
time such Person becomes a Restricted Subsidiary (whether by merger, consolidation, acquisition or otherwise) will be deemed to be Incurred by such Restricted Subsidiary at the time it becomes a Restricted Subsidiary; and the terms
“Incurred” and “Incurrence” have meanings correlative to the foregoing. 

  
 22 

 “Indebtedness” means, as applied to any Person, without duplication:

 (1) all obligations of such Person for borrowed money; 

(2) all obligations of such Person for the deferred purchase price of property or services (other than property and services purchased,
and expense accruals and deferred compensation items arising, in the ordinary course of business); 
 (3) all obligations of such
Person evidenced by notes, bonds, debentures, mandatorily redeemable preferred stock or other similar instruments (other than performance, surety and appeals bonds arising in the ordinary course of business); 

(4) all payment obligations created or arising under any conditional sale, deferred price or other title retention agreement with respect
to property acquired by such Person (unless the rights and remedies of the seller or lender under such agreement in the event of default are limited to repossession or sale of such property); 

(5) any Capital Lease Obligation of such Person, other than obligations under oil and gas leases entered into in the ordinary course of
business; 
 (6) all reimbursement, payment or similar obligations, contingent or otherwise, of such Person under acceptance,
letter of credit or similar facilities (other than letters of credit in support of trade obligations or incurred in connection with public liability insurance, workers’ compensation, unemployment insurance, old-age pensions and other social
security benefits other than in respect of employee benefit plans subject to ERISA); 
 (7) all obligations of such Person,
contingent or otherwise, under any guarantee by such Person of the obligations of another Person of the type referred to in clauses (1) through (6) above; 
 (8) the principal component or liquidation preference of all obligations of such Person with respect to the redemption, repayment or other repurchase of any Disqualified Stock or, with respect to any
Subsidiary that is not a Subsidiary Guarantor, any Preferred Stock (but excluding, in each case, any accrued dividends); 
 (9)
to the extent not otherwise included in this definition, net obligations of such Person under Commodity Agreements, Currency Agreements 

  
 23 

 
and Interest Rate Agreements (the amount of any such obligations to be equal at any time to the termination value of such agreement or arrangement giving rise to such obligation that would be
payable by such Person at such time); and 
 (10) all obligations referred to in clauses (1) through (6) above secured
by (or for which the holder of such Indebtedness has an existing right, contingent or otherwise, to be secured by) any mortgage or security interest in property (including without limitation accounts, contract rights and general intangibles) owned
by such Person and as to which such Person has not assumed or become liable for the payment of such obligations other than to the extent of the property subject to such mortgage or security interest; 

except that Indebtedness of the type referred to in clauses (7) and (10) above will be included within the definition of
“Indebtedness” only to the extent of the least of (a) the amount of the underlying Indebtedness referred to in the applicable clause (1) through (6) above; (b) in the case of clause (7), the limit on recoveries,
if any, from such Person under obligations of the type referred to in clause (7) above, and (c) in the case of clause (10), the aggregate value (as determined in good faith by the board of directors or similar governing body of such
Person) of the property of such Person subject to such mortgage or security interest. 
 In addition,
“Indebtedness” of any Person shall include Indebtedness described in the preceding paragraph that would not appear as a liability on the balance sheet of such Person if: 

(1) such Indebtedness is the obligation of a partnership or joint venture that is not a Restricted Subsidiary (a “Joint
Venture”); 
 (2) such Person or a Restricted Subsidiary of such Person is a general partner of the Joint Venture (a
“General Partner”); and 
 (3) there is recourse, by contract or operation of law, with respect to the payment
of such Indebtedness to property or assets of such Person or a Restricted Subsidiary of such Person; 
 in which case, such Indebtedness shall
be included in an amount not to exceed: 
  

	 	(a)	the lesser of (i) the net assets of the General Partner and (ii) the amount of such obligations to the extent that there is recourse, by contract or operation
of law, to the property or assets of such Person or a Restricted Subsidiary of such Person; or 

  

	 	(b)	if less than the amount determined pursuant to clause (a) immediately above, the actual amount of such Indebtedness that is recourse to such Person or a Restricted
Subsidiary of such Person, if the Indebtedness is evidenced by a writing and is for a determinable amount. 

  
 24 

 Notwithstanding the preceding, “Indebtedness” shall not include: 

(1) Production Payments and Reserve Sales; 
 (2) any obligation of a Person in respect of a farm-in agreement or similar arrangement whereby such Person agrees to pay all or a share of the drilling, completion or other expenses of an exploratory or
development well (which agreement may be subject to a maximum payment obligation, after which expenses are shared in accordance with the working or participation interest therein or in accordance with the agreement of the parties) or perform the
drilling, completion or other operation on such well in exchange for an ownership interest in an oil or gas property; 
 (3) any
obligations under Hedging Obligations; provided that such agreements are entered into for bona fide hedging purposes of the Company or its Restricted Subsidiaries (as determined in good faith by the Board of Directors or senior management of the
Company, whether or not accounted for as a hedge in accordance with GAAP); 
 (4) any obligation arising from agreements of the
Company or a Restricted Subsidiary providing for indemnification, Guarantees, adjustment of purchase price, holdbacks, contingency payment obligations or similar obligations (other than Guarantees of Indebtedness), in each case, Incurred or assumed
in connection with the acquisition or disposition of any business, assets or Capital Stock of a Restricted Subsidiary, provided that such Indebtedness is not reflected on the face of the balance sheet of the Company or any Restricted Subsidiary;

 (5) any obligation arising from the honoring by a bank or other financial institution of a check, draft or similar instrument
(except in the case of daylight overdrafts) drawn against insufficient funds in the ordinary course of business; provided, however, that such Indebtedness is extinguished within five business days of Incurrence; 

(6) in-kind obligations relating to net oil or natural gas balancing positions arising in the ordinary course of business; and 

(7) all contracts and other obligations, agreements, instruments or arrangements described in clauses (20), (21) or (22), of the
definition of “Permitted Liens.” 

  
 25 

 “Initial Additional Notes” means Additional Notes issued in an offering not
registered under the Securities Act and any Notes issued in replacement thereof, but not including any Exchange Notes issued in exchange therefor. 
 “Initial Notes” means the Notes issued on July 24, 2012 and any Notes issued in replacement thereof, but not including any Exchange Notes issued in exchange therefor. 

“Interest Payment Date” means May 15 and November 15 of each year, commencing November 15, 2012.

 “Interest Rate Agreement” means with respect to any Person any interest rate protection agreement, interest
rate futures contracts, interest rate option agreement, interest rate swap agreement, interest rate cap agreement, interest rate collar agreement, interest rate hedge agreement or other similar agreement or arrangement as to which such Person is
party or a beneficiary. 
 “Investment” means, with respect to any Person, all investments by such Person in
other Persons (including Affiliates) in the form of any direct or indirect advance, loan (other than advances or extensions of credit to employees, directors or customers in the ordinary course of business) or other extensions of credit (including
by way of Guarantee or similar arrangement, but excluding any debt or extension of credit represented by a bank deposit other than a time deposit) or capital contribution to (by means of any transfer of cash or other property or any payment for
property or services), or any purchase or acquisition of Capital Stock, Indebtedness or other similar instruments issued by, such Person and all other items that are or would be classified as investments on a balance sheet prepared in accordance
with GAAP; provided that none of the following will be deemed to be an Investment: 
 (1) Hedging Obligations Incurred in
the ordinary course of business and in compliance with the Indenture; 
 (2) endorsements of negotiable instruments and documents
in the ordinary course of business; and 
 (3) an acquisition of assets, Capital Stock or other securities by the Company or a
Subsidiary for consideration to the extent such consideration consists of Common Stock of the Company. 
 For purposes of
Section 3.04 of this First Supplemental Indenture, 
 (1) “Investment” will include the portion
(proportionate to the Company’s equity interest in a Restricted Subsidiary to be designated as an Unrestricted Subsidiary) of the fair market value of the net assets of such 

  
 26 

 
Restricted Subsidiary at the time that such Restricted Subsidiary is designated an Unrestricted Subsidiary; provided, however, that upon a redesignation of such Subsidiary as a
Restricted Subsidiary, the Company will be deemed to continue to have a permanent “Investment” in an Unrestricted Subsidiary in an amount (if positive) equal to (a) the Company’s “Investment” in such
Subsidiary at the time of such redesignation less (b) the portion (proportionate to the Company’s equity interest in such Subsidiary) of the fair market value of the net assets (as conclusively determined by the Board of Directors of the
Company in good faith) of such Subsidiary at the time that such Subsidiary is so re-designated a Restricted Subsidiary; and 

(2) any property transferred to or from an Unrestricted Subsidiary will be valued at its fair market value at the time of such transfer,
in each case as determined in good faith by the Board of Directors of the Company. 
 “Investment Grade Rating”
means a rating equal to or higher than Baa3 (or the equivalent) by Moody’s Investors Service, Inc. and BBB- (or the equivalent) by Standard & Poor’s Ratings Services (or an equivalent rating by another nationally recognized rating
agency if both of the two named rating agencies cease publishing ratings of investments), in each case, with a stable or better outlook. 
 “Issue Date” means May 18, 2011. 
 “Lien”
means any mortgage, pledge, security interest, encumbrance, lien or similar charge of any kind (including any conditional sale or other title retention agreement or lease in the nature thereof); provided, that in no event shall an operating lease be
deemed to constitute a Lien. 
 “Minority Interest” means the percentage interest represented by any shares of
stock of any class of Capital Stock of a Restricted Subsidiary that are not owned by the Company or a Restricted Subsidiary. 

“Moody’s” means Moody’s Investors Service, Inc., a subsidiary of Moody’s Corporation, and its successors.

 “Net Available Cash” from an Asset Disposition means cash payments received (including any cash payments
received by way of deferred payment of principal pursuant to a note or installment receivable or otherwise and net proceeds from the sale or other disposition of any securities received as consideration, but only as and when received, but excluding
any other consideration received in the form of assumption by the acquiring Person of Indebtedness or other obligations relating to the properties or assets that are the subject of such Asset Disposition or received in any other non-cash form)
therefrom, in each case net of: 

  
 27 

 (1) all legal, accounting, investment banking, title and recording tax expenses, commissions
and other fees and expenses Incurred, and all Federal, state, provincial, foreign and local taxes required to be paid or accrued as a liability under GAAP (after taking into account any available tax credits or deductions and any tax sharing
agreements), as a consequence of such Asset Disposition; 
 (2) all payments made on any Indebtedness which is secured by any
assets subject to such Asset Disposition, in accordance with the terms of any Lien upon such assets, or which must by its terms, or in order to obtain a necessary consent to such Asset Disposition, or by applicable law be repaid out of the proceeds
from such Asset Disposition; 
 (3) all distributions and other payments required to be made to Minority Interest holders in
Subsidiaries or joint ventures as a result of such Asset Disposition; and 
 (4) amounts accrued in accordance with GAAP in
respect of liabilities associated with the assets disposed of in such Asset Disposition and retained by the Company or any Restricted Subsidiary after such Asset Disposition or liabilities incurred in connection with such Asset Disposition.

 “Net Cash Proceeds,” with respect to any issuance or sale of Capital Stock, means the cash proceeds of such
issuance or sale net of attorneys’ fees, accountants’ fees, underwriters’ or placement agents’ fees, listing fees, discounts or commissions and brokerage, consultant and other fees and charges actually Incurred in connection with
such issuance or sale and net of taxes paid or payable as a result of such issuance or sale (after taking into account any available tax credit or deductions and any tax sharing arrangements). 

“Net Working Capital” means (a) all current assets of the Company and its Restricted Subsidiaries except current
assets under Commodity Agreements, less (b) all current liabilities of the Company and its Restricted Subsidiaries, except current liabilities included in Indebtedness and any current liabilities under Commodity Agreements, in each case as set
forth in the consolidated financial statements of the Company prepared in accordance with GAAP. 
 “Non-Recourse
Debt” means Indebtedness of a Person: 
 (1) as to which neither the Company nor any Restricted Subsidiary
(a) provides any Guarantee or credit support of any kind (including any undertaking, guarantee, indemnity, agreement or instrument that would constitute Indebtedness) or (b) is directly or indirectly liable (as a guarantor or otherwise);

  
 28 

 (2) no default with respect to which (including any rights that the holders thereof may have
to take enforcement action against an Unrestricted Subsidiary) would permit (upon notice, lapse of time or both) any holder of any other Indebtedness of the Company or any Restricted Subsidiary to declare a default under such other Indebtedness or
cause the payment thereof to be accelerated or payable prior to its stated maturity; and 
 (3) the explicit terms of which
provide there is no recourse against any of the assets of the Company or its Restricted Subsidiaries. 
 “Non-U.S.
Person” means a Person that is not a U.S. person, as defined in Regulation S. 
 “Offshore Global
Security” means a Global Security representing Notes issued and sold pursuant to Regulation S. 
 “Oil and Gas
Business” means (a) the business of acquiring, exploring, exploiting, developing, producing, operating and disposing of interests in oil, gas, liquid natural gas and other hydrocarbon properties, (b) the business of gathering,
marketing, treating, processing, storing, refining, selling and transporting any production from such interests or properties and products produced therefrom or in association therewith, and (c) any business or activity relating to, arising
from, or necessary, appropriate or incidental to the activities described in the foregoing clauses (a) and (b) of this definition, including, without limitation, contract drilling, other oilfield services and alternative energy.

 “Oil and Gas Properties” means all properties, including equity or other ownership interests therein, owned
by such Person which contain or are believed to contain “proved oil and gas reserves” as defined in Rule 4-10 of Regulation S-X of the Securities Act. 
 “Opinion of Counsel” means a written opinion from legal counsel who is acceptable to the Trustee. The counsel may be an employee of or counsel to the Company or the Trustee. 

“Pari Passu Indebtedness” means Indebtedness that ranks equally in right of payment to the Notes. 

“Permitted Business Investment” means any Investment made in the ordinary course of the business of the Company or any
Restricted Subsidiary or that is of a kind or character that is customarily made in the conduct of the Oil and Gas Business, including investments or expenditures for actively exploiting, exploring for, acquiring, developing, producing, processing,
refining, gathering, marketing or transporting Hydrocarbons through agreements, transactions, interests or arrangements which permit one to share risks or costs, comply with regulatory requirements regarding local ownership or satisfy other
objectives customarily achieved through the conduct of the Oil and Gas Business jointly with third parties, including: 

  
 29 

 (1) ownership interests in oil and gas properties, liquid natural gas facilities,
refineries, drilling operations, processing facilities, gathering systems, pipelines or ancillary real property interests; and 

(2) Investments in the form of or pursuant to oil and gas leases, operating agreements, gathering agreements, processing agreements,
farm-in agreements, farm-out agreements, development agreements, area of mutual interest agreements, unitization or pooling designations, declarations, orders and agreements, gas balancing or deferred production agreements, joint bidding agreements,
service contracts, joint venture agreements, partnership agreements (whether general or limited), subscription agreements, stock purchase agreements and other similar agreements (including for limited liability companies) with third parties.

 “Permitted Distribution” means a dividend or distribution, on one occasion and not more than one occasion,
to holders of shares of the Company’s Capital Stock of shares of Capital Stock of Unit Drilling Company or any successor to the business thereof (the “Drilling Subsidiary”); provided that the portion of Consolidated EBITDA contributed
by the Drilling Subsidiary (calculated assuming the Drilling Subsidiary and all of its subsidiaries are Restricted Subsidiaries) for the four full fiscal quarters immediately preceding the effective time of such dividend or distribution shall not
exceed 30%. 
 “Permitted Investment” means an Investment by the Company or any Restricted Subsidiary in:

 (1) the Company or a Restricted Subsidiary; provided, however, that the primary business of such Restricted
Subsidiary is the Oil and Gas Business; 
 (2) another Person if as a result of such Investment such other Person becomes a
Restricted Subsidiary or is merged or consolidated with or into, or transfers or conveys all or substantially all its assets to, the Company or a Restricted Subsidiary and in each case any Investment held by such Person; provided,
however, that such Person’s primary business is the Oil and Gas Business; 
 (3) cash and Cash Equivalents; 

(4) receivables owing to the Company or any Restricted Subsidiary created or acquired in the ordinary course and payable or dischargeable
in accordance with customary trade terms; provided, however, that such trade terms may include such concessionary trade terms as the Company or any such Restricted Subsidiary deems reasonable under the circumstances; 

  
 30 

 (5) payroll, travel and similar advances to cover matters that are expected at the time of
such advances ultimately to be treated as expenses for accounting purposes and that are made in the ordinary course of business; 

(6) loans or advances to employees and directors made in the ordinary course of business of the Company or such Restricted Subsidiary;

 (7) Capital Stock, obligations or securities received in settlement of debts created in the ordinary course of business and
owing to the Company or any Restricted Subsidiary or in satisfaction of judgments or pursuant to any plan of reorganization or similar arrangement upon the bankruptcy or insolvency of a debtor; 

(8) Investments made as a result of the receipt of non-cash consideration from an Asset Disposition that was made pursuant to and in
compliance with Section 3.07 of this First Supplemental Indenture; 
 (9) Investments in existence on the Issue Date or made
pursuant to agreements or commitments in effect on the Issue Date; 
 (10) Commodity Agreements, Currency Agreements, Interest
Rate Agreements and related Hedging Obligations, which transactions or obligations are Incurred in compliance with Section 3.02 of this First Supplemental Indenture; 
 (11) Guarantees made in accordance with Section 3.02 of this First Supplemental Indenture; 
 (12) Permitted Business Investments in an aggregate amount not to exceed 5% of Adjusted Consolidated Net Tangible Assets (with Adjusted Consolidated Net Tangible Assets and the fair market value of such
Investment being measured at the time such Investment is made and without giving effect to subsequent changes in value); 
 (13)
any Person to the extent such Investments consist of prepaid expenses, negotiable instruments held for collection and lease, utility and workers’ compensation, performance and other similar deposits made in the ordinary course of business by
the Company or any Restricted Subsidiary; 
 (14) any Asset Swap; and 

(15) acquisitions of assets, Equity Interests or other securities by the Company for consideration consisting solely of common equity
securities of the Company. 

  
 31 

 In order to be a Permitted Investment, an Investment need not be permitted solely by one subsection of this
definition but may be permitted in part of one such subsection and in part by one or more other subsections of this definition. In the event an Investment meets the criteria of one or more of the subsections of this definition, the Company, in its
sole discretion, may classify all or any portion of such Investment as being permitted by any one or more of such subsections. 

“Permitted Liens” means, with respect to any Person: 

(1) Liens securing Indebtedness and other obligations under a Credit Facility, including the Senior Credit Agreement and related Hedging
Obligations and other Senior Indebtedness and liens on assets of Restricted Subsidiaries securing Guarantees of Indebtedness and other obligations of the Company under a Credit Facility and other Guarantor Senior Indebtedness permitted to be
Incurred under the Indenture under clause (1) of the second paragraph under Section 3.02 of this First Supplemental Indenture; 
 (2) pledges or deposits by such Person under workmen’s compensation laws, unemployment insurance laws or similar legislation, or earnest money, good faith or similar deposits in connection with bids,
tenders, contracts (other than for the payment of Indebtedness) or leases to which such Person is a party, or deposits to secure public, regulatory or statutory obligations of such Person or deposits of cash or Cash Equivalents to secure surety or
appeal bonds to which such Person is a party, or deposits as security for contested taxes or import or customs duties or for the payment of rent, in each case Incurred in the ordinary course of business; 

(3) Liens imposed by law, including carriers’, warehousemen’s, suppliers’, materialmen’s and mechanics’ Liens, in
each case for sums not yet due or being contested in good faith by appropriate proceedings if appropriate reserves or other provisions required by GAAP, if any, shall have been made in respect thereof; 

(4) Liens for taxes, assessments or other governmental charges not yet subject to penalties for non-payment or which are being contested
in good faith by appropriate proceedings if appropriate reserves or other provisions required by GAAP shall have been made in respect thereof; 
 (5) Liens in favor of issuers of surety or performance bonds or letters of credit or bankers’ acceptances issued pursuant to the request of and for the account of such Person in the ordinary course
of its business; 
 (6) survey exceptions, encumbrances, ground leases, easements or reservations of, or rights of others for,
licenses, rights of way, servitudes, permits, sewers, electric lines, telegraph and telephone lines and other similar purposes, or 

  
 32 

 
zoning, building codes or surface leases and other similar rights in respect of surface operations or other restrictions (including, without limitation, minor defects or irregularities in title
and similar encumbrances) as to the use of real properties or liens incidental to the conduct of the business of such Person or to the ownership of its properties which do not in the aggregate materially adversely affect the value of the assets of
such Person and its Restricted Subsidiaries, taken as a whole or materially impair their use in the operation of the business of such Person; 
 (7) Liens securing Hedging Obligations; 
 (8) leases, licenses, subleases and
sublicenses of assets (including, without limitation, real property and intellectual property rights) which do not materially interfere with the ordinary conduct of the business of the Company or any of its Restricted Subsidiaries; 

(9) judgment Liens not giving rise to an Event of Default so long as such Lien is adequately bonded and any appropriate legal proceedings
which may have been duly initiated for the review of such judgment have not been finally terminated or the period within which such proceedings may be initiated has not expired; 

(10) Liens for the purpose of securing the payment of all or a part of the purchase price of, or Capital Lease Obligations, purchase money
obligations or other payments Incurred to finance the acquisition, lease, improvement or construction of or repairs or additions to, assets or property acquired or constructed in the ordinary course of business; provided that: 

 

	 	(a)	the aggregate principal amount of Indebtedness secured by such Liens is otherwise permitted to be Incurred under the Indenture and does not exceed the cost of the
assets or property so acquired or constructed; and 

  

	 	(b)	such Liens are created within 180 days of construction or acquisition of such assets or property and do not encumber any other assets or property of the Company or any
Restricted Subsidiary other than such assets or property and assets affixed or appurtenant thereto; 

 (11) Liens
arising solely by virtue of any statutory or common law provisions relating to banker’s Liens, rights of set-off or similar rights and remedies as to deposit accounts or other funds maintained with a depositary institution; provided
that: 

  
 33 

	 	(a)	such deposit account is not a dedicated cash collateral account and is not subject to restrictions against access by the Company in excess of those set forth by
regulations promulgated by the Federal Reserve Board; and 

  

	 	(b)	such deposit account is not intended by the Company or any Restricted Subsidiary to provide collateral to the depository institution; 

(12) Liens arising from Uniform Commercial Code financing statement filings regarding operating leases entered into by the Company and its
Restricted Subsidiaries in the ordinary course of business; 
 (13) Liens existing on the Issue Date; 

(14) Liens on property or shares of stock of a Person at the time such Person becomes a Restricted Subsidiary; provided,
however, that such Liens are not created, Incurred or assumed in connection with, or in contemplation of, such other Person becoming a Restricted Subsidiary; provided further, however, that any such Lien may not extend to any other property
owned by the Company or any Restricted Subsidiary; 
 (15) Liens on property at the time the Company or a Restricted Subsidiary
acquired the property, including any acquisition by means of a merger or consolidation with or into the Company or any Restricted Subsidiary; provided, however, that such Liens are not created, Incurred or assumed in connection with,
or in contemplation of, such acquisition; provided further, however, that such Liens may not extend to any other property owned by the Company or any Restricted Subsidiary; 
 (16) Liens securing Indebtedness or other obligations of a Restricted Subsidiary owing to the Company or a Wholly-Owned Subsidiary; 
 (17) Liens securing the Notes and Subsidiary Guarantees; 
 (18) Liens securing
Refinancing Indebtedness Incurred to refinance Indebtedness that was previously so secured, provided that any such Lien is limited to all or part of the same property or assets (plus improvements, accessions, proceeds or dividends or
distributions in respect thereof) that secured (or, under the written arrangements under which the original Lien arose, could secure) the Indebtedness being refinanced or is in respect of property that is the security for a Permitted Lien hereunder;

 (19) any interest or title of a lessor under any Capital Lease Obligation or operating lease; 

  
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 (20) Liens in respect of Production Payments and Reserve Sales, which Liens shall be limited
to the oil and gas property or other interest that is subject to such Production Payments and Reserve Sales; 
 (21) Liens
arising under oil and gas leases, farm-out agreements, farm-in agreements, division orders, contracts for the sale, purchase, exchange, transportation, gathering or processing of Hydrocarbons, partnership agreements, joint venture agreements,
unitizations and pooling designations, declarations, orders and agreements, development agreements, operating agreements, production sales contracts, area of mutual interest agreements, gas balancing or deferred production agreements, injection,
repressuring and recycling agreements, salt water or other disposal agreements, seismic or geophysical permits or agreements, and other agreements which are customary in the Oil and Gas Business; provided, however, in all instances
that such Liens are limited to the assets that are subject to the relevant agreement, program, order or contract; 
 (22) Liens
on pipelines or pipeline facilities that arise by operation of law; 
 (23) Liens securing Indebtedness (other than Subordinated
Obligations and Guarantor Subordinated Obligations) in an aggregate principal amount outstanding at any one time not to exceed the greater of $30 million or 2% of the Company’s Adjusted Consolidated Net Tangible Assets, as determined on the
date of Incurrence of this Indebtedness after giving pro forma effect to the Incurrence and the application of the proceeds therefrom; 
 (24) Liens in favor of the Company or any Subsidiary Guarantor; 
 (25) Deposits
made in the ordinary course of business to secure liability to insurance carriers; 
 (26) any (a) interest or title of a
lessor or sublessor under any lease, liens reserved in oil, gas or other Hydrocarbons, minerals, leases for bonus, royalty or rental payments and for compliance with the terms of such leases; (b) restriction or encumbrance that the interest or
title of such lessor or sublessor may be subject to (including, without limitation, ground leases or other prior leases of the demised premises, mortgages. mechanics’ liens, tax liens, and easements); or (c) subordination of the interest
of the lessee or sublessee under such lease to any restrictions or encumbrance referred to in the preceding clause (b); 
 (27)
Liens arising under the Indenture in favor of the Trustee for its own benefit and similar Liens in favor of other trustees, agents and representatives arising under instruments governing Indebtedness permitted to be incurred under the Indenture,
provided, however, that such Liens are solely for the benefit of the trustees, agents or representatives in their capacities as such and not for the benefit of the holders of such Indebtedness; and 

  
 35 

 (28) Liens in favor of collecting or payer banks having a right of setoff, revocation, or
charge back with respect to money or instruments of the Company or any Subsidiary of the Company on deposit with or in possession of such bank. 
 In each case set forth above, notwithstanding any stated limitation on the assets that may be subject to such Lien, a Permitted Lien on a specified asset or group or type of assets may include Liens on
all improvements, additions and accessions thereto and all products and proceeds thereof (including dividends, distributions and increases in respect thereof). 
 “Person” means any individual, partnership, corporation, limited liability company, joint stock company, business trust, trust, unincorporated association, joint venture, or other entity,
or government or political subdivision or agency. 
 “Preferred Stock,” as applied to the Capital Stock of any
corporation, means Capital Stock of any class or classes (however designated) which is preferred as to the payment of dividends, or as to the distribution of assets upon any voluntary or involuntary liquidation or dissolution of such corporation,
over shares of Capital Stock of any other class of such corporation. 
 “Production Payments and Reserve Sales”
means the grant or transfer by the Company or a Restricted Subsidiary to any Person of a royalty, overriding royalty, net profits interest, production payment (whether volumetric or dollar denominated), partnership or other interest in oil and gas
properties or the right to receive all or a portion of the production or the proceeds from the sale of production attributable to such properties, where the grantee or transferee thereof has recourse solely to such production or proceeds of
production, subject to the obligation of the grantor or transferor to operate and maintain, or cause to be operated and maintained, the related oil and gas properties or other related interests in a reasonably prudent manner or other customary
standard or subject to the obligation of the grantor or transferor to indemnify for environmental, title or other matters customary in the Oil and Gas Business, including any such grants or transfers pursuant to incentive compensation programs on
terms that are reasonably customary in the Oil and Gas Business for geologists, geophysicists or other providers of technical services to the Company or a Restricted Subsidiary. 

“Rating Agency” means S&P and Moody’s or if S&P or Moody’s or both shall not make a rating on the
Notes publicly available, a nationally recognized statistical rating agency or agencies, as the case may be, selected by the Company (as certified by a resolution of the Board of Directors or a committee thereof) which shall be substituted for
S&P or Moody’s or both, as the case may be. 

  
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 “Receivables” means a right to receive payment arising from a sale or lease
of goods or the performance of services by a Person pursuant to an arrangement with another Person pursuant to which such other Person is obligated to pay for goods or services under terms that permit the purchase of such goods and services on
credit and shall include, in any event, any items of property that would be classified as an “account,” “chattel paper,” “payment intangible” or “instrument” under the Uniform Commercial Code as in effect in
the State of New York and any “supporting obligations” as so defined. 
 “Receivables Fees” means any
fees or interest paid to purchasers or lenders providing the financing in connection with a factoring agreement or other similar agreement, including any such amounts paid by discounting the face amount of Receivables or participations therein
transferred in connection with a factoring agreement or other similar arrangement, regardless of whether any such transaction is structured as on-balance sheet or off-balance sheet or through a Restricted Subsidiary or an Unrestricted Subsidiary.

 “Refinancing Indebtedness” means Indebtedness that is Incurred to refund, refinance, replace, exchange,
renew, repay or extend (including pursuant to any defeasance or discharge mechanism) (collectively, “refinance,” “refinances,” and “refinanced” shall have a correlative meaning) any Indebtedness
existing on the Issue Date or Incurred in compliance with the Indenture (including Indebtedness of the Company that refinances Indebtedness of any Restricted Subsidiary and Indebtedness of any Restricted Subsidiary that refinances Indebtedness of
another Restricted Subsidiary) including Indebtedness that refinances Refinancing Indebtedness, provided, however, that: 
 (1) (a) if the Stated Maturity of the Indebtedness being refinanced is earlier than the Stated Maturity of the Notes, the Refinancing Indebtedness has a Stated Maturity no earlier than the Stated Maturity
of the Indebtedness being refinanced or (b) if the Stated Maturity of the Indebtedness being refinanced is later than the Stated Maturity of the Notes, the Refinancing Indebtedness has a Stated Maturity at least 91 days later than the Stated
Maturity of the Notes; 
 (2) the Refinancing Indebtedness has an Average Life at the time such Refinancing Indebtedness is
Incurred that is equal to or greater than the Average Life of the Indebtedness being refinanced; 
 (3) such Refinancing
Indebtedness is Incurred in an aggregate principal amount (or if issued with original issue discount, an aggregate issue price) that is equal to or less than the sum of the aggregate principal amount (or if issued with original issue discount, the
aggregate accreted value) then outstanding of the Indebtedness being refinanced (plus, without duplication, any additional Indebtedness Incurred to pay interest or premiums required by the instruments governing such existing Indebtedness and fees
and expenses Incurred in connection therewith); and 

  
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 (4) if the Indebtedness being refinanced is subordinated in right of payment to the Notes or
the Subsidiary Guarantee, such Refinancing Indebtedness is subordinated in right of payment to the Notes or the Subsidiary Guarantee on terms at least as favorable to the holders as those contained in the documentation governing the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded. 
 “Registration Rights Agreement” means
the Registration Rights Agreement, dated July 24, 2012, among the Company, the guarantors named therein and Merrill Lynch, Pierce, Fenner & Smith Incorporated, as the representative of the initial purchasers of the Notes, as amended,
supplemented or otherwise modified from time to time. 
 “Regular Record Date” means, with respect to each
Interest Payment Date, the close of business on the immediately preceding May1 or November 1, as the case may be. 

“Regulation S” means Regulation S under the Securities Act. 

“Regulation S Certificate” means a certificate substantially in the form of Exhibit D hereto. 

“Representative” means any trustee, agent or representative (if any) of an issue of Senior Indebtedness; provided
that when used in connection with the Senior Credit Agreement, the term “Representative” shall refer to the global administrative agent under the Senior Credit Agreement. 

“Restricted Investment” means any Investment other than a Permitted Investment. 

“Restricted Legend” means the legend set forth in Exhibit C. 

“Restricted Period” means the relevant 40-day distribution compliance period as defined in Regulation S. 

“Restricted Subsidiary” means any Subsidiary of the Company other than an Unrestricted Subsidiary. 

“Rule 144A” means Rule 144A under the Securities Act. 

“Rule 144A Certificate” means (i) a certificate substantially in the form of Exhibit E hereto or (ii) a
written certification addressed to the Company and the Trustee to the effect that the Person making such certification (x) is acquiring 

  
 38 

 
such Note (or beneficial interest) for its own account or one or more accounts with respect to which it exercises sole investment discretion and that it and each such account is a qualified
institutional buyer within the meaning of Rule 144A, (y) is aware that the transfer to it or exchange, as applicable, is being made in reliance upon the exemption from the provisions of Section 5 of the Securities Act provided by Rule
144A, and (z) acknowledges that it has received such information regarding the Company as it has requested pursuant to Rule 144A(d)(4) or has determined not to request such information. 

“S&P” means Standard & Poor’s Ratings Services, a division of The McGraw-Hill Companies, Inc., and its
successors. 
 “Sale/Leaseback Transaction” means an arrangement relating to property now owned or hereafter
acquired whereby the Company or a Restricted Subsidiary transfers such property to a Person and the Company or a Restricted Subsidiary leases it from such Person. 
 “Senior Indebtedness” means, whether outstanding on the Issue Date or thereafter issued, created, Incurred or assumed, the Bank Indebtedness and all amounts payable by the Company under
or in respect of all other Indebtedness of the Company, including premiums and accrued and unpaid interest (including interest accruing on or after the filing of any petition in bankruptcy or for reorganization relating to the Company at the rate
specified in the documentation with respect thereto whether or not a claim for post-filing interest is allowed in such proceeding) and fees relating thereto; provided, however, that Senior Indebtedness will not include: 

(1) any Indebtedness Incurred in violation of the Indenture; 
 (2) any obligation of the Company to any Subsidiary; 
 (3) any liability for
Federal, state, foreign, local or other taxes owed or owing by the Company; 
 (4) any accounts payable or other liability to
trade creditors arising in the ordinary course of business (including Guarantees thereof or instruments evidencing such liabilities); 
 (5) any Indebtedness, Guarantee or obligation of the Company that is expressly subordinate or junior in right of payment to any other Indebtedness, Guarantee or obligation of the Company, including,
without limitation, any Senior Subordinated Indebtedness and any Subordinated Obligations; or 
 (6) any Capital Stock.

  
 39 

 “Senior Credit Agreement” means the First Amended and Restated Senior
Credit Agreement, dated May 24, 2007, as amended December 23, 2008, among Unit Corporation, Superior Pipeline Company, L.L.C., Unit Drilling Company, Unit Petroleum Company, and Unit Texas Drilling, L.L.C., as Borrowers, The Lenders, Bank
of Oklahoma, National Association, as Administrative Agent for the Lenders and as Co-Arranger, Bank of America, National Association, as Co-Arranger, BMO Capital Markets Financing, Inc., as Syndication Agent and Compass Bank, as Documentation Agent.

 “Senior Subordinated Indebtedness” means the Notes and any other Indebtedness of the Company that
specifically provides that such Indebtedness is to rank equally with the Notes in right of payment and is not subordinated by its terms in right of payment to any Indebtedness or other obligation of the Company which is not Senior Indebtedness.

 “Significant Subsidiary” means any Restricted Subsidiary that would be a “Significant
Subsidiary” of the Company within the meaning of Rule 1-02 under Regulation S-X promulgated by the SEC. 

“Stated Maturity” means, with respect to any security, the date specified in such security as the fixed date on which
the payment of principal of such security is due and payable, including pursuant to any mandatory redemption provision, but shall not include any contingent obligations to repay, redeem or repurchase any such principal prior to the date originally
scheduled for the payment thereof. 
 “Subordinated Obligation” means any Indebtedness of the Company (whether
outstanding on the Issue Date or thereafter Incurred) that is subordinate or junior in right of payment to the Notes pursuant to a written agreement. 
 “Subsidiary” of any Person means (a) any corporation, association or other business entity (other than a partnership, joint venture, limited liability company or similar entity) of
which more than 50% of the total ordinary voting power of shares of Capital Stock entitled (without regard to the occurrence of any contingency) to vote in the election of directors, managers or trustees thereof (or persons performing similar
functions) or (b) any partnership, joint venture limited liability company or similar entity of which more than 50% of the capital accounts, distribution rights, total equity and voting interests or general or limited partnership interests, as
applicable, is, in the case of clauses (a) and (b), at the time owned or controlled, directly or indirectly, by (1) such Person, (2) such Person and one or more Subsidiaries of such Person, or (3) one or more Subsidiaries of such
Person. Unless otherwise specified herein, each reference to a Subsidiary will refer to a Subsidiary of the Company. 

  
 40 

 “Subsidiary Guarantee” means, individually, any Guarantee of payment of the
Notes by a Subsidiary Guarantor pursuant to the terms of the Indenture and any supplemental indenture thereto, and, collectively, all such Guarantees. Each such Subsidiary Guarantee will be in the form prescribed by the Indenture. 

“Subsidiary Guarantor” means (i) each of Unit Drilling Company, Unit Petroleum Company, Superior Pipeline Company,
L.L.C., Unit Texas Drilling, L.L.C., Unit Drilling USA Colombia, L.L.C., Unit Drilling Colombia, L.L.C., Unit Texas Company, Superior Pipeline Texas, L.L.C., Superior Appalachian Pipeline, L.L.C., Unit Drilling and Exploration Company, Petroleum
Supply Company and Preston County Gas Gathering, L.L.C. and (ii) any Restricted Subsidiary (other than a Foreign Subsidiary) created or acquired by the Company or one or more of its Restricted Subsidiaries after the Issue Date. 

“Treasury Rate” means the yield to maturity at the time of computation of United States Treasury securities with a
constant maturity (as compiled and published in the most recent Federal Reserve Statistical Release H.15 (519) which has become publicly available at least two business days prior to the Redemption Date (or, if such Statistical Release is no
longer published, any publicly available source or similar market data)) most nearly equal to the period from the Redemption Date to May 15, 2016; provided, however, that if the period from the Redemption Date to May 15, 2016
is not equal to the constant maturity of a United States Treasury security for which a weekly average yield is given, the Treasury Rate shall be obtained by linear interpolation (calculated to the nearest one-twelfth of a year) from the weekly
average yields of United States Treasury securities for which such yields are given, except that if the period from the Redemption Date to May 15, 2016 is less than one year, the weekly average yield on actually traded United States Treasury
securities adjusted to a constant maturity of one year shall be used. 
 “U.S. Global Security” means a Global
Security that bears the Restricted Legend representing Notes issued and sold pursuant to Rule 144A. 
 “Unrestricted
Subsidiary” means 
 (1) any Subsidiary of the Company that at the time of determination shall be designated an
Unrestricted Subsidiary by the Board of Directors of the Company in the manner provided below; and 
 (2) any Subsidiary of an
Unrestricted Subsidiary. 
 The Board of Directors of the Company may designate any Subsidiary of the Company (including any
newly acquired or newly formed Subsidiary or a Person becoming a Subsidiary through merger or consolidation or Investment therein) to be an Unrestricted Subsidiary only if: 

  
 41 

 (1) such Subsidiary or any of its Subsidiaries does not own any Capital Stock or
Indebtedness of or have any Investment in, or own or hold any Lien on any property of, any other Subsidiary of the Company which is not a Subsidiary of the Subsidiary to be so designated or otherwise an Unrestricted Subsidiary; 

(2) all the Indebtedness of such Subsidiary and its Subsidiaries shall, at the date of designation and at all times thereafter, consist of
Non-Recourse Debt; 
 (3) such designation and the Investment of the Company in such Subsidiary complies with Section 3.04
of this First Supplemental Indenture; 
 (4) such Subsidiary, either alone or in the aggregate with all other Unrestricted
Subsidiaries, does not operate, directly or indirectly, all or substantially all of the business of the Company and its Subsidiaries; 
 (5) such Subsidiary is a Person with respect to which neither the Company nor any of its Restricted Subsidiaries has any direct or indirect obligation: 

 

	 	(a)	to subscribe for additional Capital Stock of such Person; or 

  

	 	(b)	to maintain or preserve such Person’s financial condition or to cause such Person to achieve any specified levels of operating results; and

 (6) on the date such Subsidiary is designated an Unrestricted Subsidiary, such Subsidiary is not a party to any
agreement, contract, arrangement or understanding with the Company or any Restricted Subsidiary with terms materially less favorable to the Company than those that might have been reasonably obtained from Persons that are not Affiliates of the
Company. 
 Any such designation by the Board of Directors of the Company shall be evidenced to the Trustee by filing with the
Trustee a resolution of the Board of Directors of the Company giving effect to such designation and an Officers’ Certificate certifying that such designation complies with the foregoing conditions. If, at any time, any Unrestricted Subsidiary
would fail to meet the foregoing requirements as an Unrestricted Subsidiary, it shall thereafter cease to be an Unrestricted Subsidiary for purposes of the Indenture and any Indebtedness of such Subsidiary shall be deemed to be Incurred as of such
date. 
 The Board of Directors of the Company may designate any Unrestricted Subsidiary to be a Restricted Subsidiary;
provided that immediately after giving effect to such designation, no Default or Event of Default shall have occurred and be continuing or would occur as a consequence thereof and the Company could Incur at least $1.00 of additional Indebtedness
under the first paragraph of Section 3.02 of this First Supplemental Indenture on a pro forma basis taking into account such designation. 

  
 42 

 “U.S. Government Obligations” means securities that are (a) direct
obligations of the United States of America for the timely payment of which its full faith and credit is pledged or (b) obligations of a Person controlled or supervised by and acting as an agency or instrumentality of the United States of
America the timely payment of which is unconditionally guaranteed as a full faith and credit obligation of the United States of America, which, in either case, are not callable or redeemable at the option of the issuer thereof, and shall also
include a depositary receipt issued by a bank (as defined in Section 3(a)(2) of the Securities Act), as custodian with respect to any such U.S. Government Obligations or a specific payment of principal of or interest on any such U.S. Government
Obligations held by such custodian for the account of the holder of such depositary receipt; provided that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such
depositary receipt from any amount received by the custodian in respect of the U.S. Government Obligations or the specific payment of principal of or interest on the U.S. Government Obligations evidenced by such depositary receipt. 

“Underwriters” means Merrill Lynch, Pierce, Fenner & Smith Incorporated, BMO Capital Markets Corp., Banco
Bilbao Vizcaya Argentaria, S.A., BNP Paribas Securities Corp., Comerica Securities, Inc., Credit Agricole Securities (USA) Inc., Bosc, Inc., and BB&T Capital Markets, a division of Scott & Stringfellow, LLC. 

“Volumetric Production Payments” means production payment obligations recorded as deferred revenue in accordance with
GAAP, together with all undertakings and obligations in connection therewith. 
 “Voting Stock” of a
corporation means all classes of Capital Stock of such corporation then outstanding and normally entitled to vote in the election of directors. 
 “Wholly-Owned Subsidiary” means a Restricted Subsidiary, all of the Capital Stock of which (other than directors’ qualifying shares) is owned by the Company or another Wholly-Owned
Subsidiary. 
 Section 1.03. Payment of Principal and Interest. The principal of the Notes shall be due at Stated
Maturity (unless earlier redeemed). The unpaid principal amount of the Notes shall bear interest at the rate of 6.625% per year until paid or duly provided for, such interest to accrue from May 15, 2012 or from the most recent Interest
Payment Date to which interest has been paid or duly provided for. Interest shall be paid semi-annually in arrears on each Interest 

  
 43 

 
Payment Date, commencing November 15, 2012, to the Person or Persons in whose name a Note is registered at the close of business on the Regular Record Date for such Interest Payment Date,
provided that interest payable at the Stated Maturity or on a Redemption Date as provided herein will be paid to the Person to whom principal is payable. Any such interest that is not so punctually paid or duly provided for will forthwith cease
to be payable to the Holders on such Regular Record Date and may either be paid to the Person in whose name the Note (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such
Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of the Notes not less than 10 calendar days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the
requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Original Indenture. 

Payments of interest on the Notes will include interest accrued to but excluding the respective Interest Payment Dates. Interest payments
for the Notes shall be computed and paid on the basis of a 360-day year consisting of twelve 30-day months. In the event that any date on which interest is payable on the Notes is not a Business Day, then payment of the interest payable on such date
will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay), except that, if such Business Day is in the next succeeding calendar year, such payment shall be made on the
immediately preceding Business Day, in each case with the same force and effect as if made on the date the payment was originally payable. 
 Subject, in the case of any Global Security, to any applicable requirements of the Depositary, payment of the principal, premium, if any, and interest due at the Stated Maturity of, or on a Redemption
Date for, the Notes shall be made upon surrender of the Notes at the Corporate Trust Office of the Paying Agent. The principal of and interest on the Notes shall be paid in such coin or currency of the United States of America as at the time of
payment is legal tender for payment of public and private debts. Payments of interest (including interest on any Interest Payment Date) will be made, subject to such surrender where applicable, at the option of the Company, (i) by check mailed
to the address of the Person entitled thereto as such address shall appear in the Security Register or (ii) by wire transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the
Trustee at least 15 days prior to the date for payment by the Person entitled thereto. 
 Additional Interest may accrue on the
Notes in certain circumstances pursuant to the Registration Rights Agreement. All references herein, in any context, to any interest or other amount payable on or with respect to the Notes shall be deemed to include any Additional Interest payable
pursuant to the Registration Rights Agreement. 

  
 44 

 Section 1.04. Denominations. The Notes may be issued in minimum denominations of
$2,000, or integral multiples of $1,000 in excess thereof. 
 Section 1.05. Global Securities. The Notes will be
initially issued in the form of one or more Global Securities registered in the name of the Depositary (which initially shall be The Depository Trust Company) or its nominee. Except under the limited circumstances described below, Notes represented
by such Global Securities will not be exchangeable for, and will not otherwise be issuable as, Notes in definitive form. The Global Securities described above may not be transferred except by the Depositary to a nominee of the Depositary or by a
nominee of the Depositary to the Depositary or another nominee of the Depositary or to a successor Depositary or its nominee. 

Owners of beneficial interests in such Global Securities will not be considered the Holders thereof for any purpose under the Indenture,
and no Global Security representing a Note shall be exchangeable, except for another Global Security of like denomination and tenor to be registered in the name of the Depositary or its nominee or to a successor Depositary or its nominee. The rights
of holders of beneficial interests in such Global Securities shall be exercised only through the Depositary. 
 A Global
Security shall be exchangeable for Notes registered in the names of Persons other than the Depositary or its nominee only as provided by Section 2.05 of the Original Indenture. Any Global Security that is exchangeable pursuant to the preceding
sentence shall be exchangeable for Notes registered in such names as the Depositary shall direct. 
 Section 1.06. Transfer.
No service charge will be made for any registration of transfer or exchange of Notes, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection therewith. 

Section 1.07. Defeasance. The provisions of Article 11 of the Original Indenture will apply to the Notes. 

Section 1.08. Redemption at the Option of the Company. 

(a) Except as described in this Section 1.08, the Notes are not redeemable until May 15, 2016. On and after May 15, 2016,
the Company may redeem all or, from time to time, a part of the Notes upon not less than 30 nor more than 60 days’ notice, at the following Redemption Prices (expressed as a percentage of principal amount) plus accrued and unpaid interest on
the Notes, if any, to the applicable Redemption Date (subject to the right of Holders of record on the relevant Regular Record Date to receive interest due on the relevant Interest Payment Date), if redeemed during the twelve-month period beginning
on May 15 of the years indicated below: 

  
 45 

					
	 Year
	  	Percentage	 
	 2016
	  	 	103.313	% 
	 2017
	  	 	102.208	% 
	 2018
	  	 	101.104	% 
	 2019 and thereafter
	  	 	100.000	% 

 (b) Prior to May 15, 2014, the Company may on any one or more occasions redeem up to 35% of the
original principal amount of the Notes with the Net Cash Proceeds of one or more equity offerings at a Redemption Price of 106.625% of the principal amount thereof, plus accrued and unpaid interest, if any, to the Redemption Date (subject to the
right of Holders of record on the relevant Regular Record Date to receive interest due on the relevant Interest Payment Date); provided that: 
 (i) at least 65% of the original principal amount of the Notes remains outstanding after each such redemption; and 
 (ii) the redemption occurs within 90 days after the closing of such equity offering. 
 (c) In addition, at any time prior to May 15, 2016, the Company may redeem the Notes, in whole or in part, at a Redemption Price equal to 100% of the principal amount thereof plus the Applicable
Premium plus accrued and unpaid interest, if any, to the Redemption Date (subject to the right of Holders of record on the relevant Regular Record Date to receive interest due on the relevant Interest Payment Date). 

(d) If the optional Redemption Date is on or after a Regular Record Date and on or before the related Interest Payment Date, the accrued
and unpaid interest, if any, will be paid to the Person in whose name the Note is registered at the close of business on the Regular Record Date, and no additional interest will be payable to Holders whose Notes will be subject to redemption.

 (e) In the case of any partial redemption, selection of the Notes for redemption will be made by the Trustee: 

(i) in compliance with the requirements of the principal national securities exchange, if any, on which the Notes are
listed (to the extent such listing is known to the Trustee); or 

  
 46 

 (ii) if the Notes are not listed, then on a pro rata basis, by lot or by
such other method as the Trustee in its sole discretion may deem to be fair and appropriate. 
 No Note of $2,000 in original principal amount
or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption relating to such Note will state the portion of the principal amount thereof to be redeemed. A new Note in principal amount equal to the
unredeemed portion thereof will be issued in the name of the Holder upon cancellation of the original Note. 
 (f) The Company
shall notify the Trustee of the Redemption Price with respect to the redemption promptly after the calculation thereof. The Trustee shall not be responsible for calculating the Redemption Price. 

Section 1.09. Special Mandatory Redemption. 
 (a) If, for any reason, (1) the Acquisition has not been consummated on or prior to the Outside Date or (2) the Acquisition Agreement is terminated prior to the Outside Date, then the Company
will redeem all of the Notes on the Special Mandatory Redemption Date at the Special Mandatory Redemption Price. 
 (b) The
Company will cause notice of a special mandatory redemption to be mailed or electronically delivered according to the procedure of the Depository Trust Company, with a copy to the Trustee, promptly after the occurrence of the event triggering
redemption to each Holder of Notes in accordance with the Indenture; provided that notice to each Holder of Notes of such redemption may be given less than 30 days prior to the Special Mandatory Redemption Date but in any event not less than 4
business days prior to the Special Mandatory Redemption Date. If funds sufficient to pay the Special Mandatory Redemption Price on the Special Mandatory Redemption Date are deposited with the Trustee on or before such Special Mandatory Redemption
Date, the Notes will cease to bear interest on and after the Special Mandatory Redemption Date and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes will terminate. 

(c) For purposes of this Section 1.09, the following definitions apply: 

(i) “Acquisition” means the proposed acquisition of certain oil and gas assets by Unit Petroleum Company from
Noble Energy, Inc. pursuant to the Acquisition Agreement. 
 (ii) “Acquisition Agreement” means the
Purchase and Sale Agreement dated as of July 10, 2012, between Unit Petroleum Company and Noble Energy, Inc., as may be amended from time to time. 

  
 47 

 (iii) “Outside Date” means November 30, 2012. 

(iv) “Special Mandatory Redemption Date” means the earlier to occur of (1) December 7, 2012 or
(2) the 5th business day following the termination of the Acquisition Agreement for any reason. 
 (v)
“Special Mandatory Redemption Price” means (a) if the Special Mandatory Redemption Date occurs on or prior to September 30, 2012, 98.75% of the aggregate principal amount of the Notes being redeemed or (b) if the Special
Mandatory Redemption Date occurs after September 30, 2012, 99.75% of the aggregate principal amount of the Notes being redeemed, in each case, plus accrued and unpaid interest on the Notes from May 15, 2012 to, but excluding, the Special
Mandatory Redemption Date. 
 Section 1.10 Paying Agent. The Trustee shall initially serve as Paying Agent with respect
to the Notes, with the place of payment initially being the corporate trust office of the Trustee. 
 Section 1.11.
Additional Notes. Subject to the terms and conditions contained herein, the Company may from time to time, without the consent of the existing Holders of Notes create and issue additional notes (the “Additional Notes”) having
the same terms and conditions as the Notes in all respects, except for issue date, issue price and the first payment of interest thereon. Such Additional Notes, at the Company’s determination and in accordance with the provisions of the
Indenture, will be consolidated with and form a single series with the previously outstanding Notes for all purposes of the Indenture, including, without limitation, amendments, waivers, and redemptions. The aggregate principal amount of the
Additional Notes, if any, shall be unlimited. 
 Section 1.12 Restrictions on Transfer and Exchange. (a) The
transfer or exchange of any Note (or a beneficial interest therein) may only be made in accordance with this Section and Section 2.07 of the Original Indenture and, in the case of a Global Security (or a beneficial interest therein), the
applicable rules and procedures of the Depositary. The Trustee shall refuse to register any requested transfer or exchange that does not comply with the preceding sentence. 
 (b) Subject to paragraph (c), the transfer or exchange of any Note (or a beneficial interest therein) of the type set forth in column A below for a Note (or a beneficial interest therein) of the type set
forth opposite in column B below may only be made in compliance with the certification requirements (if any) described in the clause of this paragraph set forth opposite in column C below. 

  
 48 

					
	A	  	B	  	C
	U.S. Global Security	  	U.S. Global Security	  	(1)
	 U.S. Global Security
	  	Offshore Global Security	  	(2)
	Offshore Global Security	  	U.S. Global Security	  	(3)
	Offshore Global Security	  	Offshore Global Security	  	(1)

 (1) No certification is required. 

(2) The Person requesting the transfer or exchange must deliver or cause to be delivered to the Trustee a duly completed
Regulation S Certificate. 
 (3) The Person requesting the transfer or exchange must deliver or cause to be
delivered to the Trustee a duly completed Rule 144A Certificate. 
 (c) No certification is required in connection with any
transfer or exchange of any Note (or a beneficial interest therein) 
 (1) after such Note is eligible for resale pursuant to
Rule 144 under the Securities Act (or a successor provision) without the need for current public information; provided that the Company has provided the Trustee with an Officers’ Certificate to that effect, and the Company or Trustee may
require from any Person requesting a transfer or exchange in reliance upon this clause (1) an Opinion of Counsel and any other reasonable certifications and evidence in order to support such certificate; or 

(2)(x) sold pursuant to an effective registration statement, pursuant to the Registration Rights Agreement or otherwise or (y) which
is validly tendered for exchange into an Exchange Note pursuant to an Exchange Offer. 
 (d) The Trustee will retain copies of
all certificates, opinions and other documents received in connection with the transfer or exchange of a Note (or a beneficial interest therein), and the Company will have the right to inspect and make copies thereof at any reasonable time upon
written notice to the Trustee. 
 (e) Except as otherwise provided in paragraphs (c) and (f) hereof or
Section 2.15(c) of the Original Indenture, each Initial Note will bear the Restricted Legend. 
 (f) (1) If the Company
determines (upon the advice of counsel and such other certifications and evidence as the Company may reasonably require) that a Note (or beneficial interest therein) is eligible for resale pursuant to Rule 144 under the Securities Act (or a
successor provision) without the need for current public information and that the Restricted Legend is no longer necessary or appropriate in order to ensure that subsequent transfers of the Note (or a beneficial interest therein) are effected in
compliance with the Securities Act, or 

  
 49 

 (2) after an Initial Note or any Initial Additional Note is sold pursuant to an effective
registration statement under the Securities Act, pursuant to the Registration Rights Agreement or otherwise, 
 the Company may instruct the
Trustee to cancel the Note (or reduce the balance thereof to the extent only a portion thereof is to be exchanged) and issue (in accordance with Depository Trust Company procedures governing such an exchange) to the Holder thereof (or to its
transferee) a new Note of like tenor and amount, registered in the name of the Holder thereof (or its transferee), that does not bear the Restricted Legend, and the Trustee will comply with such instruction. 

(g) After an Initial Note or any Initial Additional Note is validly tendered for exchange into an Exchange Note pursuant to an Exchange
Offer, the Company may instruct the Trustee to cancel the Note, and the Trustee will comply with such instruction. 
 (h) By its
acceptance of any Note bearing the Restricted Legend (or any beneficial interest in such a Note), each Holder thereof and each owner of a beneficial interest therein acknowledges the restrictions on transfer of such Note (and any such beneficial
interest) set forth in this Indenture and in the Restricted Legend and agrees that it will transfer such Note (and any such beneficial interest) only in accordance with the Indenture and such legend. 

ARTICLE 2 

SUBSIDIARY GUARANTEES 
 Section 2.01. Guarantee. 
 (a) Subject to this Article 2, each of the
Subsidiary Guarantors hereby, jointly and severally, fully and unconditionally Guarantees, on a senior subordinated basis, to each Holder of a Note authenticated and delivered by the Trustee and to the Trustee and its successors and assigns,
irrespective of the validity and enforceability of this Indenture, the Notes or the obligations of the Company hereunder or thereunder, that: 
 (i) the principal of, premium, if any, and interest on the Notes will be promptly paid in full when due, whether at Stated Maturity, by acceleration, redemption or otherwise, and interest on the overdue
principal of and interest on the Notes, if any, if lawful, and all other obligations of the Company to the Holders or the Trustee hereunder or thereunder will be promptly paid in full or performed, all in accordance with the terms hereof and
thereof, and 

  
 50 

 (ii) in case of any extension of time of payment or renewal of any Notes or
any of such other obligations, that same will be promptly paid in full when due or performed in accordance with the terms of the extension or renewal, whether at Stated Maturity, by acceleration or otherwise. 

Failing payment when due of any amount so guaranteed or any performance so guaranteed for whatever reason, the Subsidiary Guarantors will be jointly and
severally obligated to pay the same immediately. Each Subsidiary Guarantor agrees that this is a guarantee of payment and not a guarantee of collection. 
 (b) The Subsidiary Guarantors hereby agree that their obligations hereunder are unconditional, irrespective of the validity, regularity or enforceability of the Notes or this Indenture, the absence of any
action to enforce the same, any waiver or consent by any Holder with respect to any provisions hereof or thereof, the recovery of any judgment against the Company, any action to enforce the same or any other circumstance which might otherwise
constitute a legal or equitable discharge or defense of a guarantor. 
 (c) Each Subsidiary Guarantor hereby waives diligence,
presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Company, any right to require a proceeding first against the Company, protest, notice and all demands whatsoever and covenants that this
Subsidiary Guarantee will not be discharged except by complete performance of the obligations contained in the Notes and the Indenture. 
 (d) If any Holder or the Trustee is required by any court or otherwise to return to the Company, the Subsidiary Guarantors or any custodian, trustee, liquidator or other similar official acting in
relation to either the Company or the Subsidiary Guarantors, any amount paid by either to the Trustee or such Holder, this Subsidiary Guarantee, to the extent theretofore discharged, will be reinstated in full force and effect. 

(e) Each Subsidiary Guarantor agrees that it will not be entitled to any right of subrogation in relation to the Holders in respect of any
obligations guaranteed hereby until payment in full of all obligations guaranteed hereby. Each Subsidiary Guarantor further agrees that, as between the Subsidiary Guarantors, on the one hand, and the Holders and the Trustee, on the other hand,
(1) the maturity of the obligations guaranteed hereby may be accelerated as provided in Article 4 hereof for the purposes of this Subsidiary Guarantee, notwithstanding any stay, injunction or other prohibition preventing such acceleration in
respect of the obligations guaranteed hereby, and (2) in the event of any declaration of 

  
 51 

 
acceleration of such obligations as provided in Article 4 hereof, such obligations (whether or not due and payable) will forthwith become due and payable by the Subsidiary Guarantors for the
purpose of this Subsidiary Guarantee. 
 (f) The Subsidiary Guarantors will have the right to seek contribution from any
non-paying Subsidiary Guarantor so long as the exercise of such right does not impair the rights of the Holders under the Subsidiary Guarantee. 
 Section 2.02. Limitation on Subsidiary Guarantor Liability. Each Subsidiary Guarantor, and by its acceptance of Notes, each Holder, hereby confirms that it is the intention of all such parties that
the Subsidiary Guarantee of such Subsidiary Guarantor not constitute a fraudulent transfer or conveyance for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the Uniform Fraudulent Transfer Act or any similar federal or state law
to the extent applicable to any Subsidiary Guarantee. To effectuate the foregoing intention, the Trustee, the Holders and the Subsidiary Guarantors hereby irrevocably agree that the obligations of such Subsidiary Guarantor will be limited to the
maximum amount that will, after giving effect to such maximum amount and all other contingent and fixed liabilities of such Subsidiary Guarantor that are relevant under such laws, and after giving effect to any collections from, rights to receive
contribution from or payments made by or on behalf of any other Subsidiary Guarantor in respect of the obligations of such other Subsidiary Guarantor under this Article 2, result in the obligations of such Subsidiary Guarantor under its Subsidiary
Guarantee not constituting a fraudulent transfer or conveyance. 
 Section 2.03. Releases of Subsidiary Guarantees. The
Subsidiary Guarantee of a Subsidiary Guarantor will be released: 
 (a) in connection with any sale, disposition or other
transfer (including through merger or consolidation) (x) of the Capital Stock of such Subsidiary Guarantor following which such Subsidiary Guarantor is no longer a Subsidiary of the Company, (y) of all or substantially all the assets of
the applicable Subsidiary Guarantor, in each case, to a Person that is not (either before or after giving effect to such transaction) the Company or a Restricted Subsidiary of the Company, and (z) following which the Subsidiary Guarantor is no
longer a Restricted Subsidiary, if such sale, disposition or other transfer is made in compliance with the applicable provisions of this Indenture and all of the obligations of the Subsidiary Guarantor under any Credit Facility and related
documentation and any other agreements relating to any other Indebtedness of the Company or its Restricted Subsidiaries terminate upon consummation of such transaction; 
 (b) in connection with the defeasance of the Notes and the Subsidiary Guarantees, to the extent that the obligations of the Company have been discharged thereby; or 

  
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 (c) if the Company designates any Restricted Subsidiary that is a Subsidiary Guarantor as an
Unrestricted Subsidiary in accordance with the applicable provisions of this Indenture. 
 ARTICLE 3 

PARTICULAR COVENANTS OF THE COMPANY WITH
RESPECT TO THE NOTES 
 Section 3.01. Effectiveness of Covenants.
From and after the first day on which: 
 (a) the Notes have an Investment Grade Rating from both of the Ratings Agencies;
and 
 (b) no Default has occurred and is continuing under the Indenture; 

the Company and its Restricted Subsidiaries will cease to be subject to Sections 3.02, 3.04, 3.06, 3.07, 3.08, 3.12, and clause (d) of
Section 3.10 of this First Supplemental Indenture. (collectively, the “Suspended Covenants”). If at any time the credit rating of the Notes is downgraded from an Investment Grade Rating by either Rating Agency, then the
Suspended Covenants will thereafter be reinstated and again be applicable pursuant to the terms of the Indenture, unless and until the Notes subsequently attain an Investment Grade Rating. Neither the failure of the Company or any of its
Subsidiaries to comply with a Suspended Covenant after the Notes attain an Investment Grade Rating and before any reinstatement of the Suspended Covenants nor compliance by the Company or any of its Subsidiaries with any contractual obligation
entered into in compliance with the Indenture during that period will constitute a Default, Event of Default or breach of any kind under the Indenture, the Notes or the Subsidiary Guarantees. The Trustee shall not have any obligation to monitor
whether the commencement and termination of any period when the Suspended Covenants are suspended pursuant to this Section has occurred and shall not have any obligation to notify the Holders thereof. 

During any period when the Suspended Covenants are not in effect, the Board of Directors of the Company may not designate any of the
Company’s Subsidiaries as Unrestricted Subsidiaries pursuant to the Indenture. 
 Section 3.02. Limitation on
Indebtedness. The Company may not, and may not permit any of its Restricted Subsidiaries to, Incur any Indebtedness (including Acquired Indebtedness); except, that the Company and any Subsidiary Guarantor may Incur Indebtedness if on the date
thereof: 
 (a) the Consolidated Coverage Ratio for the Company and its Restricted Subsidiaries is at least 2.25 to 1.0; and

  
 53 

 (b) no Default or Event of Default shall have occurred and be continuing or would occur as a
consequence of Incurring the Indebtedness or the transactions relating to such Incurrence. 
 The first paragraph of this
Section 3.02 will not prohibit the Incurrence of the following Indebtedness: 
 (a) Indebtedness of the Company and the
Restricted Subsidiaries Incurred pursuant to a Credit Facility in an aggregate principal amount up to the greater of (x) $500 million or (y) 35% of Adjusted Consolidated Net Tangible Assets, in each case, determined as of the date of the
Incurrence of the Indebtedness; 
 (b) Guarantees of Indebtedness of the Company or any Subsidiary Guarantor Incurred in
accordance with the provisions of the Indenture; provided that if the Indebtedness that is being Guaranteed is Guaranteed by a Subsidiary Guarantor and is (x) Senior Subordinated Indebtedness or Guarantor Senior Subordinated
Indebtedness, then the related Guarantee shall rank equally in right of payment to the Subsidiary Guarantee or (y) a Subordinated Obligation or a Guarantor Subordinated Obligation, then the related Guarantee shall be subordinated in right of
payment to the Subsidiary Guarantee; 
 (c) Indebtedness of the Company owing to and held by any Restricted Subsidiary or
Indebtedness of a Restricted Subsidiary owing to and held by the Company or any Restricted Subsidiary; provided, however, that: 
 (i) if the Company is the obligor on the Indebtedness, the Indebtedness is subordinated in right of payment to all obligations with respect to the Notes; 

(ii) if a Subsidiary Guarantor is the obligor on the Indebtedness and the Company or a Subsidiary Guarantor is not the
obligee, such Indebtedness is subordinated in right of payment to the Subsidiary Guarantees of that Subsidiary Guarantor; and 
 (iii) any subsequent issuance or transfer of Capital Stock, sale or other transfer of any such Indebtedness or other event that results in any such Indebtedness being held by a Person other than the
Company or a Restricted Subsidiary of the Company shall be deemed, in each case, to constitute an Incurrence of such Indebtedness by the Company or such Subsidiary, as the case may be, as of the date such Indebtedness first became held by such
Person; 
 (d) Indebtedness represented by (x) the Notes issued on the Issue Date, and the Subsidiary Guarantees,
(y) any Indebtedness (other than the Indebtedness 

  
 54 

 
described in clauses (a), (b), (c), (f), (h), (i) and (j) of this paragraph) outstanding on the Issue Date, and (z) any Refinancing Indebtedness Incurred in respect of any
Indebtedness described in this clause (d) or clause (e) of this paragraph or Incurred pursuant to the first paragraph of this Section 3.02; 
 (e) Indebtedness of a Person that becomes a Restricted Subsidiary or is acquired by the Company or a Restricted Subsidiary or merged into the Company or a Restricted Subsidiary Incurred and outstanding on
the date on which such Person became a Restricted Subsidiary or was acquired by or was merged into the Company or a Restricted Subsidiary (other than Indebtedness Incurred (x) to provide all or any portion of the funds utilized to consummate
the transaction or series of related transactions pursuant to which such Person became a Restricted Subsidiary or was otherwise acquired by or merged into the Company or a Restricted Subsidiary or (y) otherwise in connection with, or in
contemplation of, such acquisition); provided, however, that, at the time such Person became a Restricted Subsidiary or is acquired by or merged into the Company or a Restricted Subsidiary, the Company would have been able to Incur $1.00 of
additional Indebtedness pursuant to the first paragraph of this Section 3.02 after giving effect to the Incurrence of such Indebtedness; 
 (f) Indebtedness under Currency Agreements, Commodity Agreements and Interest Rate Agreements; provided, that, in the case of Currency Agreements or Commodity Agreements, such Currency Agreements or
Commodity Agreements are related to business transactions of the Company or its Restricted Subsidiaries entered into in the ordinary course of business and, in the case of Currency Agreements, Commodity Agreements and Interest Rate Agreements, such
Currency Agreements, Commodity Agreements and Interest Rate Agreements are entered into for bona fide hedging purposes of the Company or its Restricted Subsidiaries (as determined in good faith by the senior management of the Company); 

(g) the Incurrence by the Company or any of its Restricted Subsidiaries of Indebtedness represented by Capital Lease Obligations, mortgage
financings or purchase money obligations, in each case Incurred for the purpose of financing all or any part of the purchase price or cost of construction or improvements of property used in the business of the Company or the Restricted Subsidiary,
in an aggregate principal amount not to exceed the greater of (i) $50 million and (ii) 2.0% of Adjusted Consolidated Net Tangible Assets at any time outstanding and Refinancing Indebtedness Incurred to Refinance any Indebtedness Incurred
pursuant to this clause (g); 
 (h) Indebtedness Incurred in respect of workers’ compensation claims, self-insurance
obligations, bid, reimbursement, performance, surety, appeal and similar bonds, asset retirement obligations, completion guarantees provided by the Company or a Restricted Subsidiary in the ordinary course of business, or

  
 55 

 
required by regulatory authorities in connection with the conduct by the Company and its Restricted Subsidiaries of their businesses, including supporting Guarantees and letters of credit (in
each case other than for an obligation for money borrowed); 
 (i) Indebtedness arising from agreements of the Company or a
Restricted Subsidiary providing for indemnification, adjustment of purchase price or similar obligations, in each case, Incurred or assumed in connection with the disposition of any business, assets or Capital Stock of the Company or a Restricted
Subsidiary; 
 (j) Indebtedness arising from the honoring by a bank or other financial institution of a check, draft or similar
instrument (except in the case of daylight overdrafts) drawn against insufficient funds in the ordinary course of business; provided, however, that such Indebtedness is extinguished within five business days of the Incurrence;

 (k) Indebtedness, including Refinancing Indebtedness, Incurred by a Foreign Subsidiary in an aggregate amount not to exceed
the greater of $30 million or 15% of such Foreign Subsidiary’s Adjusted Consolidated Net Tangible Assets at any time outstanding; 
 (l) any Guarantee by the Company or any Restricted Subsidiary that directly owns Capital Stock of an Unrestricted Subsidiary that is recourse only to, and secured only by, such Capital Stock; and

 (m) in addition to the items referred to in clauses (a) through (l) of this paragraph, Indebtedness of the Company
and its Restricted Subsidiaries in an aggregate outstanding principal amount which, when taken together with the principal amount of all other Indebtedness Incurred pursuant to this clause (m) and then outstanding, will not exceed the greater
of $50 million or 3.0% of the Company’s Adjusted Consolidated Net Tangible Assets, in each case, determined as of the date of the Incurrence of the Indebtedness. 
 For purposes of determining compliance with, and the outstanding principal amount of any particular Indebtedness Incurred pursuant to and in compliance with, this Section 3.02: 

(i) Indebtedness permitted by this Section 3.02 need not be permitted solely by one provision permitting such
Indebtedness but may be permitted in part by one such provision and in part by one or more other provisions of this Section 3.02 permitting such Indebtedness; 

(ii) in the event that Indebtedness meets the criteria of more than one of the provisions permitting the Incurrence of
Indebtedness 

  
 56 

 
described in the first and second paragraphs above, the Company, in its sole discretion, may classify (or subsequently reclassify) such item of Indebtedness as being permitted by one or more such
provisions; 
 (iii) all Indebtedness outstanding on the date of the Indenture under the Senior Credit Agreement
shall be deemed Incurred under clause (a) of the second paragraph of this Section 3.02 and not the first paragraph or clause (d) of the second paragraph of this Section 3.02; 

(iv) Guarantees of, or obligations in respect of letters of credit relating to, Indebtedness which is otherwise included
in the determination of a particular amount of Indebtedness shall not be included; 
 (v) if obligations in
respect of letters of credit are Incurred pursuant to a Credit Facility and are being treated as Incurred pursuant to clause (a) of the second paragraph of this Section 3.02 and the letters of credit relate to other Indebtedness, then such
other Indebtedness shall not be included; 
 (vi) no item of Indebtedness will be given effect more than once in
any calculation contemplated by this Section 3.02 and no individual item or related items of Indebtedness will be given effect at an aggregate amount in excess of the aggregate amount required to satisfy and discharge the principal amount of
such item or related items of Indebtedness; 
 (vii) the principal amount of any Disqualified Stock of the
Company or a Restricted Subsidiary, or Preferred Stock of a Restricted Subsidiary that is not a Subsidiary Guarantor, will be equal to the greater of the maximum mandatory redemption or repurchase price (not including, in either case, any redemption
or repurchase premium) or the liquidation preference thereof; and 
 (viii) the amount of Indebtedness issued at
a price that is less than the principal amount thereof will be equal to the amount of the liability in respect thereof determined in accordance with GAAP. 
 Accrual of interest, accrual of dividends, the accretion of accreted value, the payment of interest in the form of additional Indebtedness and the payment of dividends in the form of additional shares of
Preferred Stock or Disqualified Stock will not be deemed to be an Incurrence of Indebtedness for purposes of this Section 3.02. The amount of any Indebtedness outstanding as of any date shall be (i) the accreted value thereof in the case
of any Indebtedness issued with original issue discount and (ii) the principal amount or liquidation preference thereof, together with any interest thereon that is more than 30 days past due, in the case of any other Indebtedness. 

  
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 In addition, the Company will not permit any of its Unrestricted Subsidiaries to Incur any
Indebtedness or issue any shares of Disqualified Stock, other than Non-Recourse Debt. If at any time an Unrestricted Subsidiary becomes a Restricted Subsidiary, any Indebtedness of such Subsidiary shall be deemed to be Incurred by a Restricted
Subsidiary as of such date (and, if such Indebtedness is not permitted to be Incurred as of such date under this Section 3.02, the Company shall be in Default of this Section 3.02). 

For purposes of determining compliance with any U.S. dollar-denominated restriction on the Incurrence of Indebtedness, the U.S.
dollar-equivalent principal amount of Indebtedness denominated in a foreign currency will be calculated based on the relevant currency exchange rate in effect on the date the Indebtedness was Incurred, in the case of term Indebtedness, or first
committed, in the case of revolving credit Indebtedness; provided that if such Indebtedness is Incurred to refinance other Indebtedness denominated in a foreign currency, and the refinancing would cause the applicable U.S. dollar-dominated
restriction to be exceeded if calculated at the relevant currency exchange rate in effect on the date of the refinancing, such U.S. dollar-dominated restriction shall be deemed not to have been exceeded so long as the principal amount of such
refinancing Indebtedness does not exceed the principal amount of such Indebtedness being refinanced. Notwithstanding any other provision of this Section 3.02, the maximum amount of Indebtedness that the Company may Incur pursuant to this
Section 3.02 shall not be deemed to be exceeded solely as a result of fluctuations in the exchange rate of currencies. The principal amount of any Indebtedness Incurred to refinance other Indebtedness, if Incurred in a different currency from
the Indebtedness being refinanced, will be calculated based on the currency exchange rate applicable to the currencies in which the Refinancing Indebtedness is denominated that is in effect on the date of such refinancing. 

Section 3.03. Limitation on Layering. The Company will not Incur any Indebtedness if such Indebtedness is subordinate in right of
payment to any Senior Indebtedness unless the Indebtedness is Senior Subordinated Indebtedness or is contractually subordinated in right of payment to Senior Subordinated Indebtedness. No Subsidiary Guarantor will Incur any Indebtedness if the
Indebtedness is subordinate in right of payment to any Guarantor Senior Indebtedness of the Subsidiary Guarantor unless the Indebtedness is Guarantor Senior Subordinated Indebtedness of the Subsidiary Guarantor or is contractually subordinated in
right of payment to Guarantor Senior Subordinated Indebtedness of the Subsidiary Guarantor. 

  
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 Section 3.04. Limitation on Restricted Payments. The Company will not, and will not
permit any of its Restricted Subsidiaries, directly or indirectly, to: 
 (a) pay any dividend or make any distribution on or in
respect of its Capital Stock (including any payment in respect of its Capital Stock in connection with any merger or consolidation involving the Company or any of its Restricted Subsidiaries) except: 

(i) dividends or distributions payable in Capital Stock of the Company (other than Disqualified Stock) or in options,
warrants or other rights to purchase Capital Stock of the Company; and 
 (ii) dividends or distributions payable
to the Company or a Restricted Subsidiary (and if the Restricted Subsidiary is not a Wholly-Owned Subsidiary, to its other holders of Capital Stock on a pro rata basis); 
 (b) purchase, redeem, retire or otherwise acquire for value any Capital Stock of the Company or any direct or indirect parent of the Company held by Persons other than the Company or a Restricted
Subsidiary (other than in exchange for Capital Stock of the Company or any direct or indirect parent of the Company (other than Disqualified Stock)); 
 (c) purchase, repurchase, redeem, defease or otherwise acquire or retire for value, prior to scheduled maturity, scheduled repayment or scheduled sinking fund payment, any Subordinated Obligations or
Guarantor Subordinated Obligations (other than (x) the purchase, repurchase, redemption, defeasance or other acquisition or retirement of Subordinated Obligations or Guarantor Subordinated Obligations purchased in anticipation of satisfying a
sinking fund obligation, principal installment or final maturity, in each case due within one year of the date of purchase, repurchase, redemption, defeasance or other acquisition or retirement and (y) Indebtedness permitted under clause
(c) of the second paragraph under Section 3.02); or 
 (d) make any Restricted Investment in any Person; 

(any such dividend, distribution, purchase, redemption, repurchase, defeasance, other acquisition, retirement or Restricted Investment
referred to in clauses (a) through (d) of this paragraph being referred to herein as a “Restricted Payment”), if at the time the Company or such Restricted Subsidiary makes such Restricted Payment: 

(1) a Default shall have occurred and be continuing (or would result therefrom); or 

  
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 (2) the Company is not able to Incur an additional $1.00 of Indebtedness pursuant to the
first paragraph under Section 3.02 above after giving effect, on a pro forma basis, to the Restricted Payment; or 
 (3) the
aggregate amount of the Restricted Payment and all other Restricted Payments made subsequent to the Issue Date would exceed the sum of: 
 (i) 50% of Consolidated Net Income for the period (treated as one accounting period) from the beginning of the most recent fiscal quarter ended prior to the Issue Date to the end of the most recent fiscal
quarter ending prior to the date of such Restricted Payment for which financial statements are in existence (or, in case such Consolidated Net Income is a deficit, minus 100% of such deficit); 

(ii) 100% of the aggregate Net Cash Proceeds and the fair market value of Additional Assets received by the Company from
the issue or sale of its Capital Stock (other than Disqualified Stock) or other capital contributions subsequent to the Issue Date (other than Net Cash Proceeds received from an issuance or sale of such Capital Stock to a Subsidiary of the Company
or an employee stock ownership plan, option plan or similar trust to the extent such sale to an employee stock ownership plan, option plan or similar trust is financed by loans from or Guaranteed by the Company or any Restricted Subsidiary unless
such loans have been repaid with cash on or prior to the date of determination); 
 (iii) the amount by which
Indebtedness of the Company or its Restricted Subsidiaries is reduced on the Company’s balance sheet upon the conversion or exchange (other than by a Subsidiary of the Company) subsequent to the Issue Date of any Indebtedness of the Company or
its Restricted Subsidiaries convertible into or exchangeable for Capital Stock (other than Disqualified Stock) of the Company (less the amount of any cash, or the fair market value of any other property, distributed by the Company upon such
conversion or exchange); and 
 (iv) the amount equal to payments received by the Company or any Restricted
Subsidiary in respect of, or the net reduction in, Restricted Investments made by the Company or any of its Restricted Subsidiaries in any Person resulting from: 

(A) repurchases or redemptions of such Restricted Investments by the Person in which such Restricted Investments are made,
proceeds realized upon the sale of such Restricted Investment to an unaffiliated purchaser or payments in respect of such Restricted Investment, whether through interest payments, principal payments, dividends, distributions or otherwise, by such
Person to the Company or any Restricted Subsidiary; or 

  
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 (B) the redesignation of Unrestricted Subsidiaries as Restricted
Subsidiaries (valued in each case as provided in the definition of “Investment”) not to exceed, in the case of any Unrestricted Subsidiary, the amount of Investments previously made by the Company or any Restricted Subsidiary in
such Unrestricted Subsidiary; 
 which amount in each case under clause (iv) was included in the calculation of the amount
of Restricted Payments; provided, however, that no amount will be included under clause (iv) to the extent it is already included in Consolidated Net Income. 

The provisions of the preceding paragraph will not prohibit: 
 (a) any purchase, repurchase, redemption, defeasance or other acquisition or retirement of Capital Stock, Disqualified Stock or Subordinated Obligations or Guarantor Subordinated Obligations made by
exchange for, or out of the proceeds of the substantially concurrent sale of, Capital Stock of the Company (other than Disqualified Stock and other than Capital Stock issued or sold to a Subsidiary or an employee stock ownership plan or similar
trust to the extent such sale to an employee stock ownership plan or similar trust is financed by loans from or Guaranteed by the Company or any Restricted Subsidiary unless such loans have been repaid with cash on or prior to the date of
determination); provided, however, that (x) such purchase, repurchase, redemption, defeasance, acquisition or retirement will be excluded in subsequent calculations of the amount of Restricted Payments and (y) the Net Cash
Proceeds from such sale of Capital Stock will be excluded from clause (c)(ii) of the preceding paragraph; 
 (b) any purchase,
repurchase, redemption, defeasance or other acquisition or retirement of Subordinated Obligations or Guarantor Subordinated Obligations made by exchange for, or out of the proceeds of the substantially concurrent sale of, Subordinated Obligations or
any purchase, repurchase, redemption, defeasance or other acquisition or retirement of Guarantor Subordinated Obligations made by exchange for or out of the proceeds of the substantially concurrent sale of Guarantor Subordinated Obligations that, in
each case, is permitted to be Incurred under Section 3.02 of this First Supplemental Indenture and that in each case constitutes Refinancing Indebtedness; provided, however, that such purchase, repurchase, redemption, defeasance,
acquisition or retirement will be excluded in subsequent calculations of the amount of Restricted Payments; 

  
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 (c) any purchase, repurchase, redemption, defeasance or other acquisition or retirement of
Disqualified Stock of the Company or a Restricted Subsidiary made by exchange for or out of the proceeds of the substantially concurrent sale of Disqualified Stock of the Company or such Restricted Subsidiary, as the case may be, that, in each case,
is permitted to be Incurred under Section 3.02 of this First Supplemental Indenture and that in each case constitutes Refinancing Indebtedness; provided, however, that such purchase, repurchase, redemption, defeasance, acquisition
or retirement will be excluded in subsequent calculations of the amount of Restricted Payments; 
 (d) so long as no Default or
Event of Default has occurred and is continuing, any purchase or redemption of Subordinated Obligations or Guarantor Subordinated Obligations from Net Available Cash to the extent permitted under Section 3.07 of this First Supplemental
Indenture; provided, however, that such purchase or redemption will be excluded in subsequent calculations of the amount of Restricted Payments; 
 (e) dividends paid within 60 days after the date of declaration if at such date of declaration the dividend would have complied with this provision; provided, however, that such dividends
will be included in subsequent calculations of the amount of Restricted Payments; 
 (f) so long as no Default or Event of
Default has occurred and is continuing, 
 (i) the purchase, redemption or other acquisition, cancellation or
retirement for value of Capital Stock, or options, warrants, equity appreciation rights or other rights to purchase or acquire Capital Stock of the Company or any Restricted Subsidiary or any direct or indirect parent of the Company held by any
existing or former employees or directors of the Company or any Subsidiary of the Company or their assigns, estates or heirs, in each case in accordance with the terms of employee stock option or stock purchase agreements or other agreements to
compensate employees or directors; provided that such purchases, redemptions acquisitions, cancellations or retirements pursuant to this clause will not exceed $2.0 million in the aggregate during any calendar year (with unused amounts
carried over into the following year); provided further however, that the amount of any such purchases, redemptions, acquisitions, cancellations or retirements will be included in subsequent calculations of the amount of Restricted Payments; and

 (ii) loans or advances to employees or directors of the Company or any Subsidiary of the Company the proceeds
of which are used to purchase Capital Stock of the Company, in an aggregate amount not in excess of $2.0 million at any one time outstanding; provided, however, that the amount of such loans and advances will be included in subsequent
calculations of the amount of Restricted Payments; 

  
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 (g) so long as no Default or Event of Default has occurred and is continuing, the
declaration and payment of dividends to holders of any class or series of Disqualified Stock of the Company issued in accordance with the terms of the Indenture to the extent such dividends are included in the definition of “Consolidated
Interest Expense;” provided, however, that the payment of such dividends will be excluded in subsequent calculations of the amount of Restricted Payments; 

(h) repurchases of Capital Stock deemed to occur upon the exercise of stock options, warrants or other convertible securities if such
Capital Stock represents a portion of the exercise price thereof; provided, however, that such repurchases will be excluded from subsequent calculations of the amount of Restricted Payments; 

(i) the purchase, repurchase, redemption, defeasance or other acquisition or retirement for value of any Subordinated Obligation
(i) at a purchase price not greater than 101% of the principal amount of such Subordinated Obligation in the event of a Change of Control in accordance with provisions similar to Section 3.14 of this First Supplemental Indenture or
(ii) at a purchase price not greater than 100% of the principal amount thereof in accordance with provisions similar to Section 3.07 of this First Supplemental Indenture; provided that, prior to or simultaneously with such purchase,
repurchase, redemption, defeasance or other acquisition or retirement, the Company has made the Change of Control Offer or Asset Disposition Offer, as applicable, as required with respect to the Notes and has completed the repurchase or redemption
of all Notes validly tendered for payment in connection with such Change of Control Offer or Asset Disposition Offer; provided, however, that such repurchases will be excluded from subsequent calculations of the amount of Restricted
Payments; 
 (j) any redemption of share purchase rights at a redemption price not to exceed $0.01 per right; provided,
however, that such redemption will be included in subsequent calculations of the amount of Restricted Payments; 
 (k) the
payment of cash in lieu of fractional shares of Capital Stock in connection with any transaction otherwise permitted under the Indenture; provided, however, that such payment will be included in subsequent calculations of the amount of
Restricted Payments; 
 (l) payments to dissenting stockholders not to exceed $5 million (x) pursuant to applicable law or
(y) in connection with the settlement or other satisfaction of legal claims made pursuant to or in connection with a consolidation, 

  
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merger or transfer of assets in connection with a transaction that is not prohibited by the Indenture; provided, however, that such payments will be included in subsequent
calculations of the amount of Restricted Payments; 
 (m) Restricted Payments in an amount not to exceed $40 million;
provided, however, that the amount of the Restricted Payments will be included in subsequent calculations of the amount of Restricted Payments; and 
 (n) so long as (i) no Default or Event of Default has occurred and is continuing and (ii) immediately after giving effect to such dividend or distribution on a pro forma basis, the
Company’s Consolidated Leverage Ratio would be less than 1.50:1, the declaration and payment of a Permitted Distribution; provided, however, that the amount of the Permitted Distribution will not be included in subsequent calculations of the
amount of Restricted Payments. 
 The amount of all Restricted Payments (other than cash) shall be the fair market value on the
date of the Restricted Payment of the asset(s) or securities proposed to be paid, transferred or issued by the Company or such Restricted Subsidiary, as the case may be, pursuant to the Restricted Payment. The fair market value of any cash
Restricted Payment shall be its face amount and any non-cash Restricted Payment shall be determined conclusively by the Board of Directors of the Company acting in good faith, such determination to be based upon an opinion or appraisal issued by an
accounting, appraisal or investment banking firm of national standing if such fair market value is estimated in good faith by the Board of Directors of the Company to exceed $25 million. 

Section 3.05. Limitation on Liens. The Company may not, and may not permit any of its Restricted Subsidiaries to, directly or
indirectly, create, Incur or suffer to exist any Lien (the “Initial Lien”) (other than Permitted Liens) upon any of its property or assets (including Capital Stock of Restricted Subsidiaries), whether owned on the Issue Date or acquired
after that date, which Lien secures any Senior Subordinated Indebtedness, or Subordinated Obligations, Guarantor Senior Subordinated Indebtedness or Guarantor Subordinated Obligations, unless contemporaneously with the Incurrence of such Lien
effective provision is made to secure the Indebtedness due with respect to the Notes or, with respect to Liens on any Restricted Subsidiary’s property or assets, any Subsidiary Guarantee of such Restricted Subsidiary, equally and ratably with
(or prior to in the case of Liens with respect to Subordinated Obligations or Guarantor Subordinated Obligations, as the case may be) the Indebtedness secured by such Lien for so long as such Indebtedness is so secured. 

Any Lien created for the benefit of the holders of the Notes pursuant to the preceding paragraph shall provide by its terms that such
Lien shall be automatically and unconditionally released and discharged upon the release and discharge of the Initial Lien. 

  
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 Section 3.06. Limitation on Restrictions on Distributions from Restricted Subsidiaries.
The Company may not, and may not permit any Restricted Subsidiary to, create or otherwise cause or permit to exist or become effective any consensual encumbrance or consensual restriction on the ability of any Restricted Subsidiary to:

 (a) pay dividends or make any other distributions on its Capital Stock or pay any Indebtedness or other obligations owed to
the Company or any Restricted Subsidiary (the priority of any Preferred Stock in receiving dividends or liquidating distributions prior to dividends or liquidating distributions being paid on Common Stock and any subordination of any such
Indebtedness or other obligations being deemed not to constitute such encumbrances or restrictions); 
 (b) make any loans or
advances to the Company or any Restricted Subsidiary (the subordination of loans or advances made to the Company or any Restricted Subsidiary to other Indebtedness Incurred by the Company or any Restricted Subsidiary being deemed not to constitute
such an encumbrance or restriction); or 
 (c) transfer any of its property or assets to the Company or any Restricted
Subsidiary. 
 The preceding provisions will not prohibit: 

(i) any encumbrance or restriction pursuant to an agreement in effect at or entered into on the Issue Date, including,
without limitation, the Indenture, the Notes and the Senior Credit Agreement in effect on such date; 
 (ii) any
encumbrance or restriction with respect to a Restricted Subsidiary pursuant to an agreement relating to any Capital Stock or Indebtedness Incurred by a Restricted Subsidiary on or before the date on which the Restricted Subsidiary was acquired by
the Company (other than Capital Stock or Indebtedness Incurred as consideration in, or to provide all or any portion of the funds utilized to consummate, the transaction or series of related transactions pursuant to which such Restricted Subsidiary
became a Restricted Subsidiary or was acquired by the Company or in contemplation of the transaction or transactions) and outstanding on such date provided, that any such encumbrance or restriction shall not extend to any assets or property of the
Company or any other Restricted Subsidiary other than the assets and property so acquired; 
 (iii) any
encumbrance or restriction with respect to a Restricted Subsidiary pursuant to an agreement effecting a refunding, replacement or refinancing of Indebtedness Incurred pursuant to an agreement referred to

  
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in clause (i) or (ii) of this paragraph or this clause (iii) or contained in any amendment, restatement, modification, renewal, supplemental, refunding, replacement or refinancing
of an agreement referred to in clause (i) or (ii) of this paragraph or this clause (iii), including successive refundings, replacements or refinancings; provided, however, that the encumbrances and restrictions with respect
to such Restricted Subsidiary contained in any such agreement taken as a whole are no less favorable in any material respect to the Holders of the Notes than the encumbrances and restrictions contained in such agreements referred to in clauses
(i) or (ii) of this paragraph on the Issue Date or the date such Restricted Subsidiary became a Restricted Subsidiary or was merged into a Restricted Subsidiary, whichever is applicable; 

(iv) in the case of clause (c) of the first paragraph of this Section 3.06, any encumbrance or restriction:

 (1) that restricts in a customary manner the subletting, assignment or transfer of any property or asset that
is subject to a lease, license or similar contract, or the assignment or transfer of any such lease, license or other contract; 
 (2) contained in mortgages, pledges or other security agreements permitted under the Indenture securing Indebtedness of the Company or a Restricted Subsidiary to the extent such encumbrances or
restrictions restrict the transfer of the property subject to such mortgages, pledges or other security agreements; or 
 (3) pursuant to customary provisions restricting dispositions of real property interests set forth in any reciprocal easement agreements of the Company or any Restricted Subsidiary; 

(v) (i) purchase money obligations for property acquired in the ordinary course of business and (ii) Capital Lease
Obligations permitted under the Indenture, in each case, that impose encumbrances or restrictions of the nature described in clause (c) of the first paragraph of this Section 3.06 on the property so acquired; 

(vi) any restriction with respect to a Restricted Subsidiary (or any of its property or assets) imposed pursuant to an
agreement entered into for the direct or indirect sale or disposition of all or substantially all the Capital Stock or assets of such Restricted Subsidiary (or the property or assets that are subject to such restriction) pending the closing of such
sale or disposition; 

  
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 (vii) customary encumbrances or restrictions imposed pursuant to any
agreement referred to in the definition of “Permitted Business Investment;” 
 (viii) net worth
provisions in leases and other agreements entered into by the Company or any Restricted Subsidiary in the ordinary course of business; 
 (ix) encumbrances or restrictions arising or existing by reason of applicable law or any applicable rule, regulation or order; 

(x) encumbrances and restrictions contained in contracts entered into the ordinary course of business, not relating to any
Indebtedness, and that do not individually or in the aggregate, detract from the value of, or from the ability of the Company and the Restricted Subsidiaries to realized the value of, property or assets of the Company or any Restricted Subsidiary in
any manner material to the Company or any Restricted Subsidiary; 
 (xi) with respect to any Foreign Subsidiary,
any encumbrance or restriction contained in the terms of any Indebtedness or any agreement pursuant to which such Indebtedness was Incurred if: 
 (a) either (1) the encumbrance or restriction applies only in the event of a payment default or a default with respect to a financial covenant in such Indebtedness or agreement or (2) the
Company determines that any such encumbrance or restriction will not materially affect the Company’s ability to make principal or interest payments on the Notes, as determined in good faith by the Board of Directors of the Company, whose
determination shall be conclusive, and 
 (b) the encumbrance or restriction is not materially more
disadvantageous to the holders of the Notes than is customary in comparable financing (as determined by the Company): 
 (xii)
restrictions on cash or other deposits imposed by customers under contracts entered into in the ordinary course or business; or 

(xiii) provisions with respect to the disposition or distribution of assets or property in operating agreements, joint venture agreements,
development agreements, area of mutual interest agreements and other agreements that are customary in the Oil and Gas Business and entered into in the ordinary course of business. 

  
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 Section 3.07. Limitation on Sales of Assets and Subsidiary Stock. The Company may
not, and may not permit any of its Restricted Subsidiaries to, make any Asset Disposition unless: 
 (a) the Company or the
Restricted Subsidiary, as the case may be, receives consideration at the time of the Asset Disposition at least equal to the fair market value of the assets subject to the Asset Disposition (determined on the date of contractually agreeing to such
Asset Disposition), as determined in good faith by senior management of the Company or, if the consideration with respect to such Asset Disposition exceeds $75 million, the Board of Directors of the Company (including as to the value of all non-cash
consideration); and 
 (b) at least 75% of the consideration from the Asset Disposition received by the Company or the Restricted
Subsidiary, as the case may be, is in the form of cash or Cash Equivalents or Additional Assets or any combination thereof; 

The Company or such Restricted Subsidiary, as the case may be, may elect to apply all or any portion of the Net Available Cash from such
Asset Disposition either: 
 (a) to prepay, repay, purchase, repurchase, redeem, defease or otherwise acquire or retire Senior
Indebtedness of the Company (other than Disqualified Stock or Subordinated Obligations) or Indebtedness of a Restricted Subsidiary (other than any Disqualified Stock or Guarantor Senior Subordinated Indebtedness or Guarantor Subordinated Obligation
of a Wholly-Owned Subsidiary Guarantor) (in each case other than Indebtedness owed to the Company or an Affiliate of the Company) within 365 days from the later of the date of such Asset Disposition or the receipt of such Net Available Cash;
provided, however, that, in connection with any prepayment, repayment, purchase, repurchase, redemption, defeasance, or acquisition of Indebtedness pursuant to this clause (a), the Company or such Restricted Subsidiary will retire such
Indebtedness and, in the case of revolving Indebtedness, will cause the related commitment (if any) to be permanently reduced in an amount equal to the principal amount so retired; or 

(b) to invest in Additional Assets or make Permitted Business Investments within 365 days from the later of the date of such Asset
Disposition or the receipt of such Net Available Cash; 
 provided, that, pending the final application of any such Net Available Cash in
accordance with clauses (a) or (b) above, the Company and its Restricted Subsidiaries may temporarily reduce Indebtedness or otherwise invest such Net Available Cash in any manner not prohibited by the Indenture. 

  
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 Any Net Available Cash from Asset Dispositions that is not applied or invested as provided
in the preceding paragraph will be deemed to constitute “Excess Proceeds.” Not later than the 366th day after an Asset Disposition, if the aggregate amount of Excess Proceeds exceeds $25 million, the Company must make an offer
(“Asset Disposition Offer”) to all Holders of Notes and to the extent required by the terms of other Senior Subordinated Indebtedness, to all holders of other Senior Subordinated Indebtedness outstanding with similar provisions
requiring the Company to make an offer to purchase such Senior Subordinated Indebtedness with the proceeds from any Asset Disposition (“Pari Passu Notes”), to purchase the maximum principal amount of Notes and any Pari Passu Notes
to which the Asset Disposition Offer applies that may be purchased out of the Excess Proceeds, at an offer price in cash in an amount equal to 100% of the principal amount of the Notes and Pari Passu Notes plus accrued and unpaid interest to the
date of purchase, in accordance with the procedures set forth in the Indenture or the agreements governing the Pari Passu Notes, as applicable, in each case in a minimum principal amount of $2,000 and integral multiples of $1,000 in excess thereof.
To the extent that the aggregate amount of Notes and Pari Passu Notes so validly tendered and not properly withdrawn pursuant to an Asset Disposition Offer is less than the Excess Proceeds, the Company may use any remaining Excess Proceeds for
general corporate purposes, subject to the other covenants contained in the Indenture. If the aggregate principal amount of Notes surrendered by Holders thereof and other Pari Passu Notes surrendered by holders or lenders, collectively, exceeds the
amount of Excess Proceeds, the Trustee shall select the Notes and Pari Passu Notes to be purchased pro rata on the basis of the aggregate principal amount of tendered Notes and Pari Passu Notes. Upon completion of the Asset Disposition Offer, the
amount of Excess Proceeds will be reset at zero. 
 The Asset Disposition Offer must remain open for a period of 20 business
days following its commencement, except to the extent that a longer period is required by applicable law (the “Asset Disposition Offer Period”). No later than five Business Days after the termination of the Asset Disposition Offer
Period (the “Asset Disposition Purchase Date”), the Company will purchase the principal amount of Notes and Pari Passu Notes required to be purchased pursuant to the Asset Disposition Offer (the “Asset Disposition Offer
Amount”) or, if less than the Asset Disposition Offer Amount has been so validly tendered, all Notes and Pari Passu Notes validly tendered in response to the Asset Disposition Offer. 

If the Asset Disposition Purchase Date is on or after a Regular Record Date and on or before the related Interest Payment Date, any
accrued and unpaid interest will be paid to the Person in whose name a Note is registered at the close of business on such Record Date, and no additional interest will be payable to Holders who tender Notes pursuant to the Asset Disposition Offer.

  
 69 

 On or before the Asset Disposition Purchase Date, the Company must, to the extent lawful,
accept for payment, on a pro rata basis to the extent necessary, the Asset Disposition Offer Amount of Notes and Pari Passu Notes or portions of Notes and Pari Passu Notes so validly tendered and not properly withdrawn pursuant to the Asset
Disposition Offer, or if less than the Asset Disposition Offer Amount has been validly tendered and not properly withdrawn, all Notes and Pari Passu Notes so validly tendered and not properly withdrawn, in each case in a minimum principal amount of
$2,000 and integral multiples of $1,000 in excess thereof. The Company or the Paying Agent, as the case may be, must promptly (but in any case not later than five business days after the termination of the Asset Disposition Offer Period) mail or
deliver to each tendering Holder of Notes or holder or lender of Pari Passu Notes, as the case may be, an amount equal to the purchase price of the Notes or Pari Passu Notes so validly tendered and not properly withdrawn by such holder or lender, as
the case may be, and accepted by the Company for purchase, and the Company must promptly issue a new Note, and the Trustee, upon delivery of an Officers’ Certificate from the Company, must authenticate and mail or deliver such new Note to such
Holder, in a principal amount equal to any unpurchased portion of the Note surrendered; provided that each such new Note will be in a minimum principal amount of $2,000 or an integral multiple of $1,000 in excess thereof. In addition, the
Company must take any and all other actions required by the agreements governing the Pari Passu Notes. Any Note not so accepted must be promptly mailed or delivered by the Company to the Holder thereof. The Company will publicly announce the results
of the Asset Disposition Offer on the Asset Disposition Purchase Date. 
 For the purposes of this Section 3.07, the
following will be deemed to be cash: 
 (a) the assumption by the transferee of Indebtedness (other than Senior Subordinated
Indebtedness, Subordinated Obligations or Disqualified Stock) of the Company or Indebtedness of a Restricted Subsidiary (other than Guarantor Senior Subordinated Indebtedness, Guarantor Subordinated Obligations or Disqualified Stock of any
Restricted Subsidiary that is a Subsidiary Guarantor) and the release of the Company or the Restricted Subsidiary from all liability on such Indebtedness in connection with the Asset Disposition; and 

(b) securities, notes or other obligations received by the Company or any Restricted Subsidiary from the transferee that are converted by
the Company or such Restricted Subsidiary into cash within 90 days after consummation of the receipt thereof. 
 The Company may
not, and may not permit any Restricted Subsidiary to, engage in any Asset Swaps, unless: 

  
 70 

 (a) at the time of entering into the Asset Swap and immediately after giving effect to the
Asset Swap, no Default or Event of Default shall have occurred and be continuing or would occur as a consequence thereof; and 

(b) in the event the Asset Swap involves the transfer by the Company or any Restricted Subsidiary of assets having an aggregate fair
market value, as determined by the Board of Directors of the Company in good faith, in excess of $25 million, the terms of the Asset Swap have been approved by a majority of the members of the Board of Directors of the Company. 

The Company will comply, to the extent applicable, with the requirements of Section 14(e) of the Exchange Act and any other
securities laws or regulations in connection with the repurchase of Notes pursuant to the Indenture. To the extent that the provisions of any securities laws or regulations conflict with provisions of this Section 3.07, the Company will comply
with the applicable securities laws and regulations and will be deemed not to have breached its obligations under the Indenture by virtue of such compliance. 
 Section 3.08. Limitation on Affiliate Transactions. The Company may not, and may not permit any of its Restricted Subsidiaries to, directly or indirectly, enter into or conduct any transaction
(including the purchase, sale, lease or exchange of any property or the rendering of any service) with any Affiliate of the Company (an “Affiliate Transaction”) unless: 

(a) the terms of the Affiliate Transaction are not materially less favorable to the Company or the Restricted Subsidiary, as the case may
be, than those that might reasonably have been obtained in a comparable transaction at the time of such transaction on an arm’s-length basis from a Person that is not an Affiliate of the Company; 

(b) in the event the Affiliate Transaction involves an aggregate consideration in excess of $10 million, but not greater than $50 million,
the Company delivers to the Trustee an Officers’ Certificate certifying that such Affiliate Transaction satisfies the criteria in clause (a) above; and 
 (c) in the event the Affiliate Transaction involves an aggregate consideration in excess of $50 million, the Company delivers to the Trustee an Officers’ Certificate certifying that such Affiliate
Transaction satisfies the criteria in clause (a) above and that the terms of such transaction have been approved by a majority of the members of the Board of Directors of the Company having no personal pecuniary interest in such transaction.

 The preceding paragraph will not apply to: 

  
 71 

 (a) any Restricted Payment or Permitted Investment permitted to be made pursuant to
Section 3.04 of this First Supplemental Indenture; 
 (b) any issuance of securities, or other payments, awards or grants in
cash, securities or otherwise pursuant to, or the funding of, employment agreements and other compensation arrangements, options to purchase Capital Stock of the Company, restricted stock plans, long-term incentive plans, stock appreciation rights
plans, participation plans or similar employee plans and/or insurance and indemnification arrangements provided to or for the benefit of employees and directors approved by the Board of Directors of the Company; 

(c) loans or advances to employees, officers or directors in the ordinary course of business of the Company or any of its Restricted
Subsidiaries, but in any event not to exceed $2.0 million in the aggregate outstanding at any one time with respect to all loans or advances made since the Issue Date; 
 (d) any transaction between the Company and a Restricted Subsidiary or between Restricted Subsidiaries and Guarantees issued by the Company or a Restricted Subsidiary for the benefit of the Company or a
Restricted Subsidiary, as the case may be, in accordance with Section 3.02 of this First Supplemental Indenture; 
 (e) any
transaction with a joint venture or other entity other than an Unrestricted Subsidiary which would constitute an Affiliate Transaction solely because the Company or a Restricted Subsidiary owns, directly or indirectly, an equity interest in or
otherwise controls such joint venture or other entity; 
 (f) the issuance or sale of any Capital Stock (other than Disqualified
Stock) of the Company or the receipt by the Company of any capital contribution from its shareholders; 
 (g) indemnities of
officers, directors and employees of the Company or any of its Restricted Subsidiaries permitted by charter documents or statutory provisions and any employment agreement or other employee compensation plan or arrangement entered into in the
ordinary course of business by the Company or any of its Restricted Subsidiaries; 
 (h) the payment of reasonable compensation
and fees paid to, and indemnity provided on behalf of, officers or directors of the Company or any Restricted Subsidiary; 
 (i)
the performance of obligations of the Company or any of its Restricted Subsidiaries under the terms of any agreement to which the Company or any of its Restricted Subsidiaries is a party as of or on the Issue Date, as these agreements may be
amended, modified, supplemented, extended or renewed from 

  
 72 

 
time to time; provided, however, that any future amendment, modification, supplement, extension or renewal entered into after the Issue Date will be so excluded only if its terms
are not materially less favorable to the Company or the Restricted Subsidiary, as the case may be, than those that might reasonably have been obtained in a comparable transaction at the time of such transaction on an arm’s-length basis from a
Person that is not an Affiliate of the Company; and 
 (j) transactions with customers, clients, suppliers, or purchasers or
sellers of goods or services, in each case in the ordinary course of business and otherwise in compliance with the terms of this Indenture which are fair to the Company and its Restricted Subsidiaries, in the reasonable determination of the Board of
Directors of the Company or the senior management thereof, or are on terms at least as favorable as might reasonably have been obtained at such time from an unaffiliated party. 

Section 3.09. SEC Reports. Notwithstanding that the Company may not be subject to the reporting requirements of Section 13 or
15(d) of the Exchange Act, the Company will file with the SEC (to the extent the SEC will accept such filing), and make available to the Trustee and the registered Holders of the Notes, the annual reports and the information, documents and other
reports (or copies of such portions of any of the foregoing as the SEC may by rules and regulations prescribe) that are specified in Sections 13 and 15(d) of the Exchange Act. If the SEC will not accept such filings, the Company will nevertheless
make available such Exchange Act information to the Trustee and the Holders of the Notes as if the Company were subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act. 

Section 3.10. Merger and Consolidation. Section 10.01 of the Original Indenture shall not apply to the Notes. The provisions
set forth in this Section 3.10 shall, with respect to the Notes, supersede in their entirety Section 10.01 of the Original Indenture, and all references in the Original Indenture to Section 10.01 thereof shall, with respect to the
Notes, be deemed to be references to this Section 3.10. The Company may not consolidate with or merge with or into any other Person, or transfer all or substantially all its properties and assets to another Person, unless: 

(a) the Company is the continuing or surviving Person in the consolidation or merger; or 

(b) the Person (if other than the Company) formed by the consolidation or into which the Company is merged or to which all or
substantially all of the Company’s properties and assets are transferred is a corporation, partnership, limited liability company, business trust, trust or other legal entity organized and validly existing under the laws of the United States,
any state thereof, or the District of Columbia, and expressly assumes, by a supplemental indenture, all of the Company’s obligations under the Notes and the Indenture; and 

  
 73 

 (c) immediately after the transaction and the Incurrence or anticipated Incurrence of any
Indebtedness to be Incurred in connection therewith, no Event of Default exists; and 
 (d) immediately after giving effect to
such transaction, the continuing or surviving Person would be able to Incur at least an additional $1.00 of Indebtedness pursuant to the first paragraph of Section 3.02 of this First Supplemental Indenture; and 

(e) each Subsidiary Guarantor shall have by supplemental indenture confirmed that its Subsidiary Guarantee shall apply to such
Person’s obligations (if other than the Company) in respect of the Indenture and the Notes shall continue to be in effect; 

(f) an Officers’ Certificate is delivered to the Trustee to the effect that the conditions set forth above have been satisfied and an
Opinion of Counsel has been delivered to the Trustee to the effect that the conditions set forth above have been satisfied. 

For purposes of the first paragraph of this Section 3.10, the sale, lease, conveyance, assignment, transfer, or other disposition of
all or substantially all of the properties and assets of one or more Subsidiaries of the Company, which properties and assets, if held by the Company instead of its Subsidiaries, would constitute all or substantially all of the properties and assets
of the Company on a consolidated basis, shall be deemed to be the transfer of all or substantially all of the properties and assets of the Company. 
 The continuing, surviving or successor Person will succeed to and be substituted for the Company with the same effect as if it had been named in the Indenture as a party thereof, and thereafter the
predecessor Person will be relieved of all obligations and covenants under the Indenture and the Notes. 
 Notwithstanding
clauses (c) and (d) above and clause (i)(B) below, (x) any Restricted Subsidiary may consolidate with, merge into or transfer all or part of its properties and assets to the Company or another Restricted Subsidiary and (y) the
Company may merge with an Affiliate incorporated solely for the purpose of reincorporating the Company in another jurisdiction; provided that, in the case of a Restricted Subsidiary that merges into the Company, the Company will not be
required to comply with clause (e) above. 
 The Company may not permit any Subsidiary Guarantor to consolidate with or
merge with or into any Person (other than another Subsidiary Guarantor) and may not permit the conveyance, transfer or lease of substantially all of the assets of any Subsidiary Guarantor (other than another Subsidiary Guarantor) unless: 

  
 74 

 (i) (A) the Person formed by the consolidation or into which the Subsidiary
Guarantor merged or to which all, or substantially all of the Subsidiary Guarantor’s properties and assets are transferred is a corporation, partnership, limited liability company, business trust, trust or other legal entity organized and
validly existing under the laws of the United States, any state thereof, or the District of Columbia and such Person (if not such Subsidiary Guarantor) will expressly assume, by supplemental indenture, all the obligations of such Subsidiary
Guarantor under its Subsidiary Guarantee; (B) immediately after the transaction and the Incurrence or anticipated Incurrence of any Indebtedness to be Incurred in connection therewith, no Event of Default exists; and (C) the Company will
deliver to the Trustee an Officers’ Certificate and an Opinion of Counsel, each to the effect that the conditions set forth above have been satisfied; and 
 (ii) the transaction is made in compliance with Section 3.07 of this First Supplemental Indenture. 
 Section 3.11. Future Subsidiary Guarantors. The Company will cause each Restricted Subsidiary (other than a Foreign Subsidiary) created or acquired by the Company or one or more of its Restricted
Subsidiaries after the Issue Date to execute and deliver to the Trustee a Subsidiary Guarantee pursuant to which such Subsidiary Guarantor will unconditionally Guarantee, on a joint and several basis, the full and prompt payment of the principal of,
premium, if any and interest on the Notes on a senior subordinated basis. 
 Section 3.12. Limitation on Lines of Business.
The Company may not, and may not permit any Restricted Subsidiary to, engage in any business other than the Oil and Gas Business, except to such extent as would not be material to the Company and its Restricted Subsidiaries taken as a whole.

 Section 3.13. Payments for Consent. Neither the Company nor any of its Restricted Subsidiaries will, directly or
indirectly, pay or cause to be paid any consideration, whether by way of interest, fees or otherwise, to any Holder of any Notes for or as an inducement to any consent, waiver or amendment of any of the terms or provisions of the Indenture or the
Notes unless such consideration is offered to be paid or is paid to all Holders of the Notes that consent, waive or agree to amend in the time frame set forth in the solicitation documents relating to such consent, waiver or amendment. 

Section 3.14. Offer to Repurchase Upon Change of Control. 

  
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 (a) If a Change of Control occurs, unless the Company has exercised its right to redeem all
of the Notes as described under Section 1.08 of this First Supplemental Indenture, the Company will be required to offer to repurchase from each Holder all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of
such Holder’s Notes at a purchase price in cash equal to 101% of the principal amount of the Notes plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of Holders of record on the relevant Regular Record Date
to receive interest due on the relevant Interest Payment Date). 
 (b) Within 30 days following any Change of Control, unless the
Company has exercised its right to redeem the Notes as described under Section 1.08 of this First Supplemental Indenture, the Company will mail a notice (the “Change of Control Offer”) to each Holder, with a copy to the
Trustee, stating: 
 (i) that a Change of Control has occurred and that the Company is offering to purchase the
Holder’s Notes at a purchase price in cash equal to 101% of the principal amount of the Notes plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of holders of record on a Regular Record Date to receive
interest on the relevant Interest Payment Date) (the “Change of Control Payment”); 
 (ii) the
repurchase date (which shall be no earlier than 30 days nor later than 60 days from the date such notice is mailed) (the “Change of Control Payment Date”); and 

(iii) the procedures determined by the Company, consistent with the Indenture, that a Holder must follow in order to have
its Notes repurchased. 
 (c) On the Change of Control Payment Date, the Company will, to the extent lawful: 

(i) accept for payment all Notes or portions of Notes (in a minimum principal amount of $2,000 and integral multiples of
$1,000 in excess thereof) properly tendered pursuant to the Change of Control Offer; 
 (ii) deposit with the
Paying Agent for the Notes an amount equal to the Change of Control Payment in respect of all Notes or portions of Notes so tendered; and 
 (iii) deliver or cause to be delivered to the Trustee the Notes so accepted together with an Officers’ Certificate stating the aggregate principal amount of Notes or portions of Notes being purchased
by the Company. 

  
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 (d) The Paying Agent will promptly mail to each Holder of Notes so tendered the Change of
Control Payment for the Notes, and the Trustee will promptly authenticate and mail (or cause to be transferred by book entry) to each Holder a new Note equal in principal amount to any unpurchased portion of the Notes surrendered, if any;
provided that each new Note will be in a principal amount of $2,000 or an integral multiple of $1,000 in excess thereof. 

(e) If the Change of Control Payment Date is on or after a Regular Record Date and on or before the related Interest Payment Date, any
accrued and unpaid interest will be paid to the Person in whose name a Note is registered at the close of business on the Regular Record Date, and no additional interest will be payable to Holders who tender pursuant to the Change of Control Offer.

 (f) The Company will not be required to make a Change of Control Offer upon a Change of Control if a third party makes the
Change of Control Offer in the manner, at the times and otherwise in compliance with the requirements set forth in the Indenture applicable to a Change of Control Offer made by the Company and purchases all Notes validly tendered and not withdrawn
under the Change of Control Offer. 
 (g) A Change of Control Offer may be made in advance of a Change of Control, conditional
upon such Change of Control, if a definitive agreement is in place for the Change of Control at the time of the making of the Change of Control Offer. 
 (h) The Company will comply, to the extent applicable, with the requirements of Section 14(e) of the Exchange Act and any other securities laws or regulations in connection with the repurchase of
Notes pursuant to this Section 3.14. To the extent that the provisions of any securities laws or regulations conflict with provisions of the Indenture, the Company will comply with the applicable securities laws and regulations and will be
deemed not to have breached its obligations described in the Indenture by virtue of such compliance. 
 ARTICLE 4 

EVENTS OF DEFAULT WITH RESPECT TO
THE NOTES 
 The term “Event of Default,” whenever used in the Original Indenture
or this First Supplemental Indenture with respect to the Notes, means any one of the following events: 
 (a) failure to pay
principal of or premium, if any, on any Note when due at its Stated Maturity; 

  
 77 

 (b) failure to pay any interest on any Note when due, which failure continues for 30
calendar days; 
 (c) failure by the Company or any Subsidiary Guarantor to comply with its obligations under Section 3.10
of this First Supplemental Indenture; 
 (d) failure by the Company to comply with any of its obligations under Article 3 of this
First Supplemental Indenture (other than a failure to purchase Notes which will constitute an Event of Default under clause (e) below and other than a failure to comply with Section 3.10 of this First Supplemental Indenture which is
covered by clause (c) above), which failure or breach continues for 30 calendar days after written notice thereof has been given to the Company as provided in the Indenture; 

(e) failure to redeem or repurchase any Note when required to do so under the terms thereof; 

(f) failure to perform, or breach of, any other covenant of the Company in the Indenture (other than a covenant included in the Indenture
solely for the benefit of a series of debt securities other than the Notes), which failure or breach continues for 60 calendar days after there has been given, by registered or certified mail, to the Company by the Trustee or to the Company and the
Trustee by the Holders of at least 25% in principal amount of the Outstanding Notes a written notice specifying such default or breach and requiring it to be remedied and stating that such notice is a “Notice of Default” under the
Indenture; 
 (g) any nonpayment at maturity or other default (beyond any applicable grace period) under any agreement or
instrument relating to any other Indebtedness of the Company or a Significant Subsidiary, the unpaid principal amount of which is not less than $25 million, which default results in the acceleration of the maturity of the Indebtedness prior to its
stated maturity or occurs at the final maturity thereof; 
 (h) Events of Default of the type and subject to the conditions set
forth in clauses (g) and (h) of Section 6.01 of the Original Indenture; 
 (i) failure by the Company or any
Significant Subsidiary or group of Restricted Subsidiaries that, taken together (as of the latest audited consolidated financial statements for the Company and its Restricted Subsidiaries), would constitute a Significant Subsidiary to pay final
judgments aggregating in excess of $25 million (net of any amounts that a reputable and creditworthy insurance company has acknowledged liability for in writing), which judgments are not paid, discharged or stayed for a period of 60 calendar days;
or 

  
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 (j) any Subsidiary Guarantee of a Significant Subsidiary or group of Subsidiary Guarantors
that taken together as of the latest audited consolidated financial statements for the Company and its Restricted Subsidiaries would constitute a Significant Subsidiary ceases to be in full force and effect (except as contemplated by the terms of
the Indenture) or is declared null and void in a judicial proceeding or any Subsidiary Guarantor that is a Significant Subsidiary or group of Subsidiary Guarantors that taken together as of the latest audited consolidated financial statements of the
Company and its Restricted Subsidiaries would constitute a Significant Subsidiary denies or disaffirms its obligations under the Indenture or its Subsidiary Guarantee. 
 All references in the Original Indenture to Sections 6.01(a), (b), (d), (e), (f), and (i) thereof shall, with respect to the Notes, be deemed to be references to Sections (b), (a), (c), (f),
(g) and (i) above, respectively. 
 ARTICLE 5 
 MODIFICATION AND WAIVER 
 Section
5.01. Without Consent of Holders of Notes. 
 (a) The provisions of Section 9.01 of the Original Indenture shall
apply to the Notes. 
 (b) The Company, the Subsidiary Guarantors and the Trustee may amend or supplement this Indenture or the
Notes without the consent of any Holder of a Note to add Subsidiary Guarantees with respect to the Notes. 
 Section 5.02.
With Consent of Holders of Notes. Without the consent of each Holder affected, no amendment or waiver with respect to the Notes under this Article 5 or under Article 9 of the Original Indenture may, without the consent of each Holder of an
outstanding Note affected thereby: 
 (a) reduce the principal amount of, the rate of interest on, or the premium, if any,
payable upon the redemption or repurchase of, the Notes; 
 (b) change the Stated Maturity of, or any installment of principal
of, or interest on, the Notes; 
 (c) change the time at which any Note may be redeemed or repurchased as described above under
Section 1.08; Section 3.07 or Section 3.14 of this First Supplemental Indenture; 
 (d) change the place or
currency of payment of principal of, or premium, if any, or interest on the Notes; 

  
 79 

 (e) impair the right to institute suit for the enforcement of any payment on or with respect
to the Notes on or after the Stated Maturity or prepayment date thereof; 
 (f) reduce the percentage in principal amount of the
Notes required for modification or amendment of this Indenture or the Notes or for waiver of compliance with certain provisions of this Indenture or the Notes or for waiver of certain defaults; or 

(g) modify the Subsidiary Guarantees in any manner adverse to the holders of the Notes. 

The holders of at least a majority in principal amount of the Notes may, on behalf of the holders of all of the Notes, waive our
compliance with specified covenants of the Indenture. The holders of at least a majority in principal amount of the Notes may, on behalf of the holders of all of the Notes, waive any past default under the Indenture with respect to the Notes,
except: 
 (a) a default in the payment of the principal of, or premium, if any, or interest on, the Notes; or 

(b) a default of a provision of the Indenture that cannot be modified or amended without the consent of the each holder of the Notes.

 No amendment may be made to the subordination provisions of the Indenture that adversely affects the rights of any holder of
Senior Indebtedness then outstanding unless the holders of such Senior Indebtedness (or any group or representative thereof authorized to give a consent) consent to such change. In addition, any amendment to the subordination provisions of the
Indenture that adversely affects the rights of any holder of the Notes will require the consent of the holders of at least 66 2/3% in aggregate principal amount of the Notes then outstanding. 

ARTICLE 6 

MISCELLANEOUS PROVISIONS 
 Section 6.01. Recitals by the Company. The recitals in this First Supplemental Indenture are made by the Company only and not by the Trustee, and the Trustee assumes no responsibility for their
correctness. The Trustee makes no representations as to the validity or sufficiency of this First Supplemental Indenture or of the Notes. The Trustee shall not be accountable for the use or application by the Company of the Notes or the proceeds
thereof. All of the provisions contained in the Original Indenture in respect of the rights, privileges, immunities, powers and duties of the Trustee shall be applicable in respect of the Notes and of this First Supplemental Indenture as fully and
with like effect as if set forth herein in full. 

  
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 Section 6.02. Ratification and Incorporation of Original Indenture. As supplemented
hereby, the Original Indenture is in all respects ratified and confirmed, and the Original Indenture and this First Supplemental Indenture shall be read, taken and construed as one and the same instrument. The changes, modifications and supplements
to the Original Indenture effected by this Supplemental Indenture shall be applicable only with respect to, and shall only govern the terms of, the Notes, which may be issued from time to time, and shall not apply to any other Securities that may be
issued under the Original Indenture unless a supplemental indenture with respect to such other Securities specifically incorporates such changes, modifications and supplements. The provisions of this Supplemental Indenture shall supersede any
conflicting provisions in the Original Indenture. 
 Section 6.03. Executed in Counterparts. This First Supplemental
Indenture may be simultaneously executed in several counterparts, each of which shall be deemed to be an original, and such counterparts shall together constitute but one and the same instrument. 

Section 6.04. NEW YORK LAW TO GOVERN. THIS FIRST SUPPLEMENTAL INDENTURE AND EACH NOTE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK. 
 Section 6.05. Successors and Assigns. All covenants and agreements
in this First Supplemental Indenture and each Note by the Company shall bind its successors and assigns, whether so expressed or not. 
 Section 6.06. Separability. In case any provision in this First Supplemental Indenture or in any Note shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby. 

  
 81 

 IN WITNESS WHEREOF, each party hereto has caused this instrument to be signed in its name
and behalf by its duly authorized officers, all as of the day and year first above written. 
  

			
	UNIT CORPORATION
		
	By:	 	/s/ Larry D. Pinkston
		 	 Name: Larry D. Pinkston

Title:   President and Chief
            Executive Officer

  

			
	 UNIT DRILLING COMPANY
 UNIT PETROLEUM COMPANY
 UNIT TEXAS COMPANY
 UNIT DRILLING AND EXPLORATION
      COMPANY
 PETROLEUM SUPPLY
COMPANY

		
	By:	 	/s/ Mark E. Schell
		 	 Name: Mark E. Schell
 Title:
  Senior Vice President

  

			
	 UNIT DRILLING USA COLOMBIA, L.L.C.
 UNIT DRILLING COLOMBIA, L.L.C.
 UNIT TEXAS DRILLING, L.L.C.

PRESTON COUNTY GAS GATHERING, L.L.C.
 SUPERIOR
PIPELINE COMPANY, L.L.C.
 SUPERIOR PIPELINE TEXAS, L.L.C.
 SUPERIOR APPALACHIAN PIPELINE, L.L.C.

		
	By:	 	/s/ Mark E. Schell
		 	 Name: Mark E. Schell
 Title:
  Manager

 [Signature Page to First Supplemental Indenture] 

 
			
	WILMINGTON TRUST, NATIONAL
ASSOCIATION, as Trustee
		
	By:	 	 /s/ Jane Schweiger

	Name: Jane Schweiger
 Title:   Vice President

 [Signature Page to First Supplemental Indenture] 

 EXHIBIT A 

Form of 65/8 % Senior Subordinated Note due 2021 

UNLESS THIS SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION
(“DTC”), TO UNIT CORPORATION OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL
INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. 
 THIS SECURITY IS A GLOBAL SECURITY
WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF DTC OR A NOMINEE THEREOF. THIS SECURITY MAY NOT BE TRANSFERRED TO, OR REGISTERED OR EXCHANGED FOR SECURITIES REGISTERED IN THE NAME OF, ANY PERSON OTHER
THAN DTC OR A NOMINEE THEREOF, AND NO SUCH TRANSFER MAY BE REGISTERED, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE. EVERY SECURITY AUTHENTICATED AND DELIVERED UPON REGISTRATION OF TRANSFER OF, OR IN EXCHANGE FOR, OR IN LIEU OF,
THIS SECURITY WILL BE A GLOBAL SECURITY SUBJECT TO THE FOREGOING, EXCEPT IN SUCH LIMITED CIRCUMSTANCES. 

  
 A-1

 CUSIP No. [            ]

 ISIN No. [            ] 

[FACE OF NOTE] 
 65/8 % Senior Subordinated Notes due 2021 

Principal amount at Maturity $[            ] 

UNIT CORPORATION 

Unit Corporation, a Delaware corporation (the “Company”) promises to pay to Cede & Co., or registered assigns,
the principal sum of [            ] Dollars on May 15, 2021 or such greater or lesser amount as may be indicated on Schedule A hereto. 

Interest Payment Dates: May 15 and November 15, commencing November 15, 2012 
 Regular Record Dates: May 1 and November 1 
 Additional provisions of this Note are set
forth on the other side of this Note. 

  
 A-2

 
			
	 UNIT CORPORATION

		
	By:	 	 
		 	Name:
		 	Title:
		
	By:	 	 
		 	Name:
		 	Title:

  

			
	Attest:
		
	By:	 	 

  
 A-3

			
	TRUSTEE’S CERTIFICATE OF AUTHENTICATION
	
	This is one of the Global Securities referred to in the within-mentioned Indenture:

  

			
	 WILMINGTON TRUST, NATIONAL
       ASSOCIATION, as Trustee

		
	By:	 	 
		 	Authorized Signatory

 Dated: 

  
 A-4

 [FORM OF REVERSE OF NOTE]1 

6 
5/8% Senior Subordinated Notes due 2021 

Capitalized terms used herein shall have the meanings assigned to them in the Indenture referred to below unless otherwise indicated.

 (1) Interest. Unit Corporation, a Delaware corporation (together with its permitted successors, the
“Company”), promises to pay interest on the principal amount of this Note at 6 5/8% per annum from May 15, 2012 until the principal hereof is paid or made available for payment. The Company shall
pay interest, if any, semi-annually in arrears on May 15 and November 15 of each such year, commencing November 15, 2012 or if any such day is not a Business Day, on the next succeeding Business Day (each an “Interest Payment
Date”). Interest on the Notes shall accrue from the most recent date to which interest has been paid or, if no interest has been paid, from May 15, 2012[; provided that if this Note is authenticated between a record date
referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date; provided, further, that the first Interest Payment Date shall be the first of May 15 or
November 15 to occur after the date of issuance, unless such May 15 or November 15 occurs within one calendar month of such date of issuance, in which case the first Interest Payment Date shall be the second of May 15 or
November 15 to occur after the date of issuance]. Interest shall be computed on the basis of a 360-day year of twelve 30-day months. 
 The Holder of this Note is entitled to the benefits of the Registration Rights Agreement, dated July 24, 2012, among the Company, the guarantors named therein and Merrill Lynch, Pierce,
Fenner & Smith Incorporated, as the representative of the initial purchasers of the Notes, as amended, supplemented or otherwise modified from time to time (the “Registration Rights Agreement”). 

Additional Interest (as defined in the Registration Rights Agreement) may accrue on the Notes in certain circumstances pursuant to the
Registration Rights Agreement. All references herein, in any context, to any interest or other amount payable on or with respect to the Notes shall be deemed to include any Additional Interest payable pursuant to the Registration Rights Agreement.

 (2) Method of Payment. The Company shall pay interest on the Notes (except defaulted interest) to the Person in whose
name(s) this Note is registered at the close of business on the May 1 or November 1 next preceding the Interest Payment Date (each, a “Regular Record Date”); provided that interest payable at the Stated Maturity or
on a Redemption Date as provided in the Indenture will be 
  

	1 
	 Insert if Notes are Additional Notes 

  
 A-5

 
paid to the Person to whom principal is payable. The Notes shall be payable as to principal of or premium, if any, or interest at the office or agency of the Company maintained for such purpose,
or, at the option of the Company, payment of interest may be made by check mailed to the Holders at their addresses set forth in the Security Register or by wire transfer at such place and to such account at a banking institution in the United
States as may be designated in writing to the Trustee at least 15 days prior to the date for payment by the Person entitled thereto. Such payment shall be in such coin or currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts. 
 (3) Paying Agent and Registrar. Initially, Wilmington Trust, National
Association, the Trustee under the Indenture, shall act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity.

 (4) Indenture. The Company issued the Notes under an Indenture, dated as of July 24, 2012 (the “Original
Indenture”), between the Company and the Trustee, as supplemented by the First Supplemental Indenture, dated as of July 24, 2012, among the Company the Subsidiary Guarantors (as defined therein) parties thereto and the Trustee (the
“First Supplemental Indenture”; and together with the Original Indenture, the “Indenture”). The terms of the Notes include those stated in the Indenture and those made part of the Indenture by reference to the Trust
Indenture Act of 1939, as amended (15 U.S. Code §§ 77aaa-77bbbb). The Notes are subject to all such terms, and Holders are referred to the Indenture and such Act for a statement of such terms. To the extent any provision of this Note
conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling. The Notes are obligations of the Company initially in the aggregate principal amount of $400,000,000. Subject to compliance with
Section 1.11 of the First Supplemental Indenture, the Company is permitted to issue Additional Notes under the Indenture in an unlimited principal amount. Any such Additional Notes that may be issued shall be treated as issued and outstanding
Notes for all purposes of the Indenture, unless the context clearly indicates otherwise. 
 (5) Subordination. The Notes
are subordinated in right of payment, in the manner and to the extent set forth in the Indenture. Each Holder by his acceptance hereof agrees to be bound by such provisions and authorizes and expressly directs the Trustee, on his behalf, to take
such action as may be necessary or appropriate to effectuate the subordination provided for in the Indenture and appoints the Trustee his attorney-in-fact for such purposes. 
 (6) Guarantees. This Note is guaranteed by the Persons, if any, specified as Subsidiary Guarantors in the Indenture to the extent provided in the Indenture. 

  
 A-6

 The Subsidiary Guarantees are subordinated to the Senior Indebtedness of the applicable Subsidiary Guarantor
in the manner and to the extent provided in the Indenture. Each Holder by his acceptance hereof agrees to be bound by such provisions and authorizes and expressly directs the Trustee, on his behalf, to take such action as may be necessary or
appropriate to effectuate the subordination provided for in the Indenture and appoints the Trustee his attorney-in-fact for such purposes. 
 (7) Optional Redemption. 
 (a) Except as set forth in Section 1.08 of
the First Supplemental Indenture and clauses (b) and (c) of this Paragraph 7, the Notes are not redeemable until May 15, 2016. On and after May 15, 2016, the Company may redeem all or, from time to time, a part of the Notes upon
not less than 30 nor more than 60 days’ notice, at the following redemption prices (expressed as a percentage of principal amount) plus accrued and unpaid interest on the Notes (the “Redemption Price”), if any, to the
applicable redemption date (subject to the right of Holders of record on the Regular Record Date to receive interest due on the relevant Interest Payment Date) (a “Redemption Date”), if redeemed during the twelve-month period
beginning on May 15 of the years indicated below: 
  

					
	 YEAR
	  	Percentage	 
	 2016
	  	 	103.313	% 
	 2017
	  	 	102.208	% 
	 2018
	  	 	101.104	% 
	 2019 and thereafter
	  	 	100.000	% 

 (b) Notwithstanding the provisions of clause (a) of this Paragraph 7, prior to May 15, 2014, the
Company may on any one or more occasions redeem up to 35% of the original principal amount of the Notes issued under the Indenture at a redemption price equal to 106.625% of the principal amount thereof, plus accrued and unpaid interest, if any, to
the Redemption Date (subject to the right of Holders of record on the relevant Regular Record Date to receive interest due on the relevant Interest Payment Date), with the Net Cash Proceeds of one or more equity offerings; provided that
(1) at least 65% of the original principal amount of Notes issued under the Indenture remains Outstanding immediately after the occurrence of such redemption; and (2) that such redemption shall occur within 90 days of the date of the
closing of such equity offering. 
 (c) In addition, at any time prior to May 15, 2016, the Company may redeem the Notes, in
whole or in part, at a Redemption Price equal to 100% of the principal amount thereof plus the Applicable Premium plus accrued and unpaid interest, if any, to the Redemption Date (subject to the right of Holders of record on the relevant Regular
Record Date to receive interest due on the relevant Interest Payment Date). 

  
 A-7

 (8) Special Mandatory Redemption. 

(a) If, for any reason, (1) the Acquisition has not been consummated on or prior to the Outside Date or (2) the Acquisition
Agreement is terminated prior to the Outside Date, then the Company will redeem all of the Notes on the Special Mandatory Redemption Date at the Special Mandatory Redemption Price. 

(b) The Company will cause notice of a special mandatory redemption to be mailed or electronically delivered according to the procedure of
the Depository Trust Company, with a copy to the Trustee, promptly after the occurrence of the event triggering redemption to each Holder of Notes in accordance with the Indenture; provided that notice to each Holder of Notes of such redemption may
be given less than 30 days prior to the Special Mandatory Redemption Date but in any event not less than 4 business days prior to the Special Mandatory Redemption Date. If funds sufficient to pay the Special Mandatory Redemption Price on the Special
Mandatory Redemption Date are deposited with the Trustee on or before such Special Mandatory Redemption Date, the Notes will cease to bear interest on and after the Special Mandatory Redemption Date and, other than the right to receive the Special
Mandatory Redemption Price, all rights under the Notes will terminate. 
 (c) For purposes of this Paragraph 8, the following
definitions apply: 
 (i) “Acquisition” means the proposed acquisition of certain oil and gas assets by
Unit Petroleum Company from Noble Energy, Inc. pursuant to the Acquisition Agreement. 
 (ii) “Acquisition
Agreement” means the Purchase and Sale Agreement dated as of July 10, 2012, between Unit Petroleum Company and Noble Energy, Inc., as may be amended from time to time. 

(iii) “Outside Date” means November 30, 2012. 

(iv) “Special Mandatory Redemption Date” means the earlier to occur of (1) December 7, 2012 or
(2) the 5th business day following the termination of the Acquisition Agreement for any reason. 
 (v)
“Special Mandatory Redemption Price” means (a) if the Special Mandatory Redemption Date occurs on or prior to September 30, 2012, 98.75% of the aggregate principal amount of the Notes being redeemed or (b) if the Special
Mandatory Redemption Date occurs after September 30, 2012, 99.75% of the aggregate principal amount of the Notes being redeemed, in each case, plus accrued and unpaid interest on the Notes from May 15, 2012 to, but excluding, the Special
Mandatory Redemption Date. 

  
 A-8

 (9) Offer to Repurchase Upon Change of Control. Upon the occurrence of a Change of
Control, the Company will be required to offer to repurchase from each Holder all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of such Holder’s Notes pursuant to the offer described below (the
“Change of Control Offer”) at an offer price in cash equal to 101% of the aggregate principal amount thereof plus accrued and unpaid interest, if any, thereon to the date of purchase (the “Change of Control
Payment”). Within 30 days following any Change of Control, the Company shall mail a notice to each Holder setting forth the procedures governing the Change of Control Offer as required by the Indenture. 

(10) Notice of Redemption. Notice of redemption shall be mailed at least 30 days but not more than 60 days before the redemption
date to each Holder whose Notes are to be redeemed at its address appearing in the Securities Register. The Company shall notify the Trustee of the Redemption Price with respect to the redemption promptly after the calculation thereof. The Trustee
shall not be responsible for calculating the Redemption Price. 
 (11) Denominations, Transfer, Exchange. The Notes are in
registered form without coupons in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. Every Note presented or
surrendered for registration of transfer or exchange will (if so required by the Company or the Trustee) be duly endorsed, or be accompanied by a written instrument or instruments of transfer, in form reasonably satisfactory to the Company and the
Security Registrar duly executed, by the Holder thereof or his attorney duly authorized in writing. The Company need not exchange or register the transfer of any Notes for a period of 15 days before the mailing of the notice of redemption or any
Note so selected for redemption in whole or in part, except in the case of Notes to be redeemed in part, the portion thereof not being redeemed. No service charge will be made for any such registration of transfer or exchange, but the Company may
require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection therewith. 

(12) Persons Deemed Owners. The registered Holder of a Note may be treated as its owner for all purposes. 

(13) Amendment, Supplement and Waiver. Subject to certain exceptions, the Indenture, the Subsidiary Guarantees or the Notes may be
amended or supplemented with the consent of the Holders of at least a majority in principal amount of the Notes, and any existing default or compliance with any provision of the Indenture, the Subsidiary Guarantees or the Notes (other than a Default
or Event of Default in the payment of the principal of or premium, if any, or interest on the Notes) or compliance with any provision of the Indenture, the Subsidiary Guarantee or the Notes may be waived with the consent of the Holders of a

  
 A-9

 
majority in principal amount of the Notes. Without the consent of any Holder of a Note, the Indenture, the Subsidiary Guarantee or the Notes may be amended or supplemented in certain limited
respects as set forth in the Indenture. 
 (14) Events of Default. Events of Default include (1) failure to pay
principal of or premium, if any, on any Note when due at its Stated Maturity; (2) failure to pay any interest on any Note when due, which failure continues for 30 calendar days; (3) failure by the Company or any Subsidiary Guarantor to
comply with its obligations under Section 3.10 of the First Supplemental Indenture; (4) failure by the Company to comply with any of its obligations under Article 3 of the First Supplemental Indenture (in each case, other than a failure to
purchase Notes which will constitute an Event of Default under clause (5) of this paragraph 13 and other than a failure to comply with Section 3.10 of the First Supplemental Indenture which is covered by clause (3) of this Paragraph
13), which failure or breach continues for 30 calendar days after written notice thereof has been given to the Company as provided in the Indenture; (5) failure to redeem or repurchase any Note when required to do so under the terms thereof;
(6) failure to perform, or breach of, any other covenant of the Company in the Indenture (other than a covenant included in the Indenture solely for the benefit of a series of debt securities other than the Notes), which failure or breach
continues for 60 calendar days after written notice thereof has been given to the Company as provided in the Indenture; (7) any nonpayment at maturity or other default (beyond any applicable grace period) under any agreement or instrument
relating to any other Indebtedness of the Company or a Significant Subsidiary, the unpaid principal amount of which is not less than $25 million, which default results in the acceleration of the maturity of the Indebtedness prior to its stated
maturity or occurs at the final maturity thereof; (8) specified events of bankruptcy, insolvency, or reorganization involving the Company or a Significant Subsidiary; (9) failure by the Company or any Significant Subsidiary or group of
Restricted Subsidiaries that, taken together (as of the latest audited consolidated financial statements for the Company and its Restricted Subsidiaries), would constitute a Significant Subsidiary to pay final judgments aggregating in excess of $25
million (net of any amounts that a reputable and creditworthy insurance company has acknowledged liability for in writing), which judgments are not paid, discharged or stayed for a period of 60 days; or (10) any Subsidiary Guarantee of a
Significant Subsidiary or group of Subsidiary Guarantors that taken together as of the latest audited consolidated financial statements for the Company and its Restricted Subsidiaries would constitute a Significant Subsidiary ceases to be in full
force and effect (except as contemplated by the terms of the Indenture) or is declared null and void in a judicial proceeding or any Subsidiary Guarantor that is a Significant Subsidiary or group of Subsidiary Guarantors that taken together as of
the latest audited consolidated financial statements of the Company and its Restricted Subsidiaries would constitute a Significant Subsidiary denies or disaffirms its obligations under the Indenture or its Subsidiary Guarantee. If any Event of

  
 A-10

 
Default (other than an Event of Default specified in clause (8) of this paragraph) occurs and is continuing, the Trustee or the Holders of at least 25% in principal amount of the then
outstanding Notes may declare the principal amount of all the Notes to be due and payable immediately. Notwithstanding the foregoing, in the case of an Event of Default specified in clause (8) of this paragraph 13, all outstanding Notes shall
become due and payable immediately without any declaration or other act on the part of the Trustee or any Holder. However, at any time after a declaration of acceleration with respect to the Notes has been made, but before a judgment or decree based
on such acceleration has been obtained, the holders of a majority in principal amount of the Notes may, under specified circumstances, rescind and annul such acceleration. 
 Subject to the duty of the Trustee to act with the required standard of care during an Event of Default, the Trustee will have no obligation to exercise any of its rights or powers under the Indenture at
the request or direction of the Holders of the Notes, unless holders of the Notes shall have furnished to the Trustee reasonable security or indemnity. Subject to the provisions of the Indenture, including those requiring security or indemnification
of the Trustee, the Holders of a majority in principal amount of the Notes will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Trustee, or exercising any trust or power conferred on
the Trustee, with respect to the Notes. 
 Pursuant to the Trust Indenture Act, the Trustee is required, within 90 calendar days
after the occurrence of a Default in respect of the Notes is known to the Trustee, to give to the Holders of the Notes notice of all uncured Defaults known to it, except that (x) in the case of a Default in the performance of any covenant of
the character contemplated in clause (4) of this paragraph 13, no notice will be given until at least 30 calendar days after the occurrence of the Default, and (y) other than in the case of a Default of the character contemplated in clause
(1) or (2) of this paragraph 13, the Trustee may withhold notice if and so long as it in good faith determines that the withholding of notice is in the interests of the Holders of the Notes. 

No Holder of a Note will have any right to institute any proceeding with respect to the Indenture or for any remedy thereunder unless:
(a) the Holder has previously given to the Trustee written notice of a continuing Event of Default; (b) the Holders of at least 25% in aggregate principal amount of the outstanding Notes have requested the Trustee to institute a proceeding
in respect of the Event of Default; (c) the Holder or Holders have furnished reasonable indemnity to the Trustee to institute the proceeding as Trustee; (d) the Trustee has not received from the Holders of a majority in principal amount of
the outstanding Notes a direction inconsistent with the request; and (e) the Trustee has failed to institute the proceeding within 60 calendar days. However, the limitations described above do not apply to a suit instituted by a Holder of a
Note for enforcement of payment of the principal of and interest on or after the applicable due dates for the payment of such principal and interest. 

  
 A-11

 (15) Trustee Dealings with Company. The Trustee, in its individual or any other
capacity, may become the owner or pledgee of Notes and, subject to the terms of the Indenture, may otherwise deal with the Company with the same rights it would have if it were not Trustee. 

(16) No Recourse Against Others. No director, officer, employee, incorporator, Affiliate or stockholder of the Company or any of
the Subsidiary Guarantors, as such, will have any liability for any obligations of the Company or such Subsidiary Guarantor under the Notes, the Indenture, the Subsidiary Guarantee or for any claim based on, in respect of, or by reason of, such
obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes. 

(17) Authentication. This Note shall not be valid until authenticated by the manual signature of the Trustee or an Authenticating
Agent. 
 (18) Abbreviations. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM
(= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with rights of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). 

(19) CUSIP, ISIN or Other Similar Numbers. Pursuant to a recommendation promulgated by the Committee on Uniform Security
Identification Procedures, the Company has caused CUSIP, ISIN or other similar numbers to be printed on the Notes and the Trustee may use CUSIP, ISIN or other similar numbers in notices of redemption as a convenience to Holders. No representation is
made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption and reliance may be placed only on the other identification numbers placed thereon. 

(20) GOVERNING LAW. THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 

  
 A-12

 ASSIGNMENT FORM 
 To assign this Note, fill in the form below and have your signature guaranteed: (I) or (we) assign and transfer this Note to 

 
  
 (Insert assignee’s soc. sec. or tax I.D. no.) 
  

 
  

 
  

 
  

 
  

 
  

 
  

 
  

 
 (Print or type assignee’s
name, address and zip code) 
 and irrevocably appoint
                     agent to transfer this Note on the books of the Company. The agent may substitute another to act for him.

  
  

 

									
	Date:  	 	 	 		  	Your Name:	  	 
		 		 		  	(Print your name exactly as it appears on the face of this Note)
					
		 		 		  	Your Signature:  	  	 
		 		 		  	(Sign exactly as your name appears on the face of this Note)
				
		 		 		  	Signature Guarantee*:  
				
		 		 		  	  

  
 A-13

  

	*	Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee). 

  
 A-14

 [THE FOLLOWING PROVISION TO BE INCLUDED ON ALL 
 CERTIFICATES BEARING A RESTRICTED LEGEND] 
 In connection with any transfer of
this Note occurring prior to                     , the undersigned confirms that such transfer is made without utilizing any general
solicitation or general advertising and further as follows: 
 Check One 

 ̈ (1) This Note is being transferred to a “qualified institutional buyer” in compliance with
Rule 144A under the Securities Act of 1933, as amended and certification in the form of Exhibit E to the Indenture is being furnished herewith. 

 ̈ (2) This Note is being transferred to a Non-U.S. Person in compliance with the exemption from
registration under the Securities Act of 1933, as amended, provided by Regulation S thereunder, and certification in the form of Exhibit D to the Indenture is being furnished herewith. 

or 
  ̈ (3) This Note is being transferred other than in accordance with (1) or (2) above and documents are being furnished which comply with the conditions of transfer set forth in this Note and the
Indenture. 
 If none of the foregoing boxes is checked, the Trustee is not obligated to register this Note in the name of any
Person other than the Holder hereof unless and until the conditions to any such transfer of registration set forth herein and in the Indenture have been satisfied. 
  

									
	Date:  	 	 	 		  		  	
				
		 		 		  	  

Seller

					
		 		 		  	By	  	 

  

			
		  	NOTICE: The signature to this assignment must correspond with the name as written upon the face of the within-mentioned instrument in every particular, without alteration or any
change whatsoever.

  
 A-15

			
	Signature Guarantee:5	 	 

  

			
		
	By	 	 
	To be executed by an executive officer

  
  

	5 	 Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements
include membership or participation in the Securities Transfer Association Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Registrar in addition to, or in
substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended. 

  
 A-16

 SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL 

SECURITY 
 The
following exchanges of a part of this Global Security for an interest in another Global Security, or exchanges of a part of another Global Security for an interest in this Global Security, have been made: 

 

									
	 Date of Exchange
	 	 Amount of decrease
in Principal Amount
of
this Global
Security
	 	 Amount of 
increase in 
Principal Amount 
of
this Global
Security
	 	 Principal Amount 
of this Global
Security
following
such decrease (or
increase)
	 	 Signature of
authorized officer of
Trustee
or Note
Custodian

  
 A-17

 [FORM OF NOTATION OF GUARANTEE] 

For value received, each Subsidiary Guarantor (which term includes any successor Person under the Indenture) has, jointly and severally,
fully and unconditionally and irrevocably guaranteed, to the extent set forth in the First Supplemental Indenture, dated as of July 24, 2012 (the “Indenture”), among Unit Corporation, a Delaware corporation (the “Company”),
the Subsidiary Guarantor named therein and Wilmington Trust, National Association, as trustee (the “Trustee”), and subject to the provisions in the Indenture, (a) the due and punctual payment of the principal of, premium, if any, and
interest on the Notes (as defined in the Indenture), whether at Stated Maturity, by acceleration, redemption or otherwise, the due and punctual payment of interest on overdue principal of and interest, to the extent permitted by law, and the due and
punctual performance of all other obligations of the Company to the Holders or the Trustee all in accordance with the terms of the Indenture and (b) in case of any extension of time of payment or renewal of any Notes or any of such other
obligations, that the same will be promptly paid in full when due or performed in accordance with the terms of the extension or renewal, whether at Stated Maturity, by acceleration or otherwise. The obligations of the Subsidiary Guarantors to the
Holders of Notes and to the Trustee pursuant to the Guarantee and the Indenture are expressly set forth in Article Two of the Indenture and reference is hereby made to the Indenture for the precise terms of the Guarantee. This Guarantee shall be
governed by and construed in accordance with the laws of the State of New York. 
  

			
	  

	[Insert Name of Guarantor]
		
	By:	 	 
		 	 Name:

Title:

		
	Dated:	 	  

  
 A-18

 EXHIBIT B 
 [FORM OF SUPPLEMENTAL INDENTURE TO BE DELIVERED BY 
 SUBSEQUENT GUARANTORS]

 This SUPPLEMENTAL INDENTURE, dated as of             ,
20     , among                     (the “Guaranteeing Subsidiary”), a subsidiary of Unit Corporation (or
its permitted successor), a Delaware corporation (the “Company”), the Company, the other Subsidiary Guarantors (as defined in the Indenture referred to herein) and Wilmington Trust, National Association, as Trustee. 

W I T N E S S E T H 
 WHEREAS, the Company and the Trustee entered into an Indenture (the “Original Indenture”), dated as of July 24, 2012, as supplemented by a First Supplemental Indenture, dated as of
July 24, 2012 among the Company, the Subsidiary Guarantors and the Trustee (the “First Supplemental Indenture”; and together with the Original Indenture, the “Indenture”), pursuant to which the Company has
issued $400,000,000 of aggregate principal amount of 6 5/8% Senior Subordinated Notes due 2021 (the “Notes”); 

WHEREAS, Section 5.01(b) of the First Supplemental Indenture provides that the Company, the Subsidiary Guarantors and the Trustee
may amend or supplement the Indenture in order to add Subsidiary Guarantees with respect to the Notes, without the consent of the Holders of the Notes; and 
 WHEREAS, all acts and things prescribed by the Indenture, by law and by the Certificate of Incorporation and the Bylaws (or comparable constituent documents) of the Company, the Subsidiary Guarantors, the
Guaranteeing Subsidiary and the Trustee necessary to make this Supplemental Indenture a valid instrument legally binding on the Company, the Subsidiary Guarantors, the Guaranteeing Subsidiary and the Trustee, in accordance with its terms, have been
duly done and performed; 
 NOW THEREFORE, to comply with the provisions of the Indenture, and in consideration of the
foregoing, the Guaranteeing Subsidiary, the Company, the Subsidiary Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

ARTICLE 1 

Section 1.01. This Supplemental Indenture is supplemental to the Indenture and does and shall be deemed to form a part of, and shall
be construed in connection with and as part of, the Indenture for any and all purposes. 

  
 B-1

 Section 1.02. This Supplemental Indenture shall become effective immediately upon its
execution and delivery by the Guaranteeing Subsidiary, the Company, the Subsidiary Guarantors and the Trustee. 
 ARTICLE 2

 Section 2.01. The Guaranteeing Subsidiary hereby agrees to be bound by the terms, conditions and other provisions of
the Indenture with all attendant rights, duties and obligations stated therein, on a joint and several basis with the Subsidiary Guarantors parties hereto and thereto, with the same force and effect as if originally named as a Subsidiary Guarantor
therein and as if such party executed the Indenture on the date thereof. 
 ARTICLE 3 

Section 3.01. Except as specifically modified herein, the Indenture and the Notes are in all respects ratified and confirmed
(mutatis mutandis) and shall remain in full force and effect in accordance with their terms. 
 Section 3.02. All
capitalized terms used but not defined herein shall have the same respective meanings ascribed to them in the Indenture. 

Section 3.03. Except as otherwise expressly provided herein, no duties, responsibilities or liabilities are assumed, or shall be
construed to be assumed, by the Trustee by reason of this Supplemental Indenture. This Supplemental Indenture is executed and accepted by the Trustee subject to all of the terms and conditions set forth in the Indenture with the same force and
effect as if those terms and conditions were repeated at length herein and made applicable to the Trustee with respect hereto. 

Section 3.04. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

 Section 3.05. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an
original, but all of them together represent the same agreement. 
 Section 3.06. The headings herein are inserted for
convenience of reference only and are not intended to be part of, or to affect the meaning or interpretation of, this letter agreement. 
 Section 3.07. The recitals hereto are statements only of the Company, the Subsidiary Guarantors and the Guaranteeing Subsidiary and shall not be considered statements of or attributable to the
Trustee. 

  
 B-2

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed and attested, all as of the date first above written. 
  

			
	[GUARANTEEING SUBSIDIARY]
		
	By:	 	 
		 	Name:
		 	Title:

 
			
	
	UNIT CORPORATION
		
	By:	 	 
		 	Name:
		 	Title:

 
			
	
	[EXISTING GUARANTORS]
		
	By:	 	 
		 	Name:
		 	Title:

 
			
	
	 WILMINGTON TRUST, NATIONAL
       ASSOCIATION, as Trustee

		
	By:	 	 
		 	Name:
		 	Title:

  
 B-3

 EXHIBIT C 
 RESTRICTED LEGEND 
 THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION. NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED,
ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, SUCH REGISTRATION. THE HOLDER OF THIS SECURITY, BY ITS ACCEPTANCE HEREOF, AGREES ON ITS OWN BEHALF AND ON BEHALF OF
ANY INVESTOR ACCOUNT FOR WHICH IT HAS PURCHASED SECURITIES, TO OFFER, SELL OR OTHERWISE TRANSFER SUCH SECURITY, BEFORE THE DATE (THE “RESALE RESTRICTION TERMINATION DATE”) THAT IS [IN THE CASE OF U.S. GLOBAL SECURITIES: ONE YEAR] [IN THE
CASE OF OFFSHORE GLOBAL SECURITIES: 40 DAYS] AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF AND THE LAST DATE ON WHICH THE COMPANY OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF SUCH SECURITY), ONLY
(A) TO THE COMPANY OR ITS SUBSIDIARIES, (B) UNDER A REGISTRATION STATEMENT THAT HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO LONG AS THE SECURITIES ARE ELIGIBLE FOR RESALE UNDER RULE 144A UNDER THE SECURITIES ACT,
TO A PERSON IT REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT
THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) UNDER OFFERS AND SALES THAT OCCUR OUTSIDE THE UNITED STATES WITHIN THE MEANING OF REGULATION S UNDER THE SECURITIES ACT, (E) TO AN INSTITUTIONAL “ACCREDITED INVESTOR”
WITHIN THE MEANING OF RULE 501(a)(1), (2), (3) OR (7) UNDER THE SECURITIES ACT THAT IS AN INSTITUTIONAL ACCREDITED INVESTOR ACQUIRING THE SECURITY FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL ACCREDITED INVESTOR, IN EACH
CASE IN A MINIMUM PRINCIPAL AMOUNT OF THE SECURITIES OF $250,000, FOR INVESTMENT PURPOSES AND NOT WITH A VIEW TO OR FOR OFFER OR SALE IN CONNECTION WITH ANY DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT, OR (F) UNDER ANOTHER AVAILABLE
EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE 

  
 C-1

 
SECURITIES ACT, SUBJECT TO THE COMPANY’S AND THE TRUSTEE’S RIGHT BEFORE ANY SUCH OFFER, SALE OR TRANSFER UNDER CLAUSES (C), (D), (E) OR (F) TO REQUIRE THE DELIVERY OF AN
OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM. THIS LEGEND WILL BE REMOVED ON THE REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE. 

  
 C-2

 EXHIBIT D 
 Regulation S Certificate 

            ,      

Wilmington Trust, National Association 
 246
Goose Lane, Suite 105 
 Guilford, CT 06347 
 Attention: Unit Corporation Adminstrator 
  

	 	Re:	Unit Corporation 

	 	  	6.625% Subordinated 

	 	  	Notes due 2021 (the “Notes”) 

	 	  	Issued under the Indenture (the “Indenture”) dated as as 

	 	  	of July 24, 2012 relating to the
Notes                                        
         

 Ladies and Gentlemen: 

Terms are used in this Certificate as used in Regulation S (“Regulation S”) under the Securities Act of 1933, as amended (the
“Securities Act”), except as otherwise stated herein. 
 [CHECK A OR B AS APPLICABLE.] 

 

	 	 ̈ A.	This Certificate relates to our proposed transfer of $             principal amount of Notes issued
under the Indenture. We hereby certify as follows: 

  

	 	1.	The offer and sale of the Notes was not and will not be made to a person in the United States (unless such person is excluded from the definition of “U.S.
person” pursuant to Rule 902(k)(2)(vi) or the account held by it for which it is acting is excluded from the definition of “U.S. person” pursuant to Rule 902(k)(2)(i) under the circumstances described in Rule 902(h)(3)) and such offer
and sale was not and will not be specifically targeted at an identifiable group of U.S. citizens abroad. 

  

	 	2.	 Unless the circumstances described in the parenthetical in paragraph 1 above are applicable, either (a) at the time the buy order was originated,
the buyer was outside the United States or we and any person acting on our behalf reasonably 

  
 D-1

	 	
believed that the buyer was outside the United States or (b) the transaction was executed in, on or through the facilities of a designated offshore securities market, and neither we nor any
person acting on our behalf knows that the transaction was pre-arranged with a buyer in the United States. 

  

	 	3.	Neither we, any of our affiliates, nor any person acting on our or their behalf has made any directed selling efforts in the United States with respect to the Notes.

  

	 	4.	The proposed transfer of Notes is not part of a plan or scheme to evade the registration requirements of the Securities Act. 

 

	 	5.	If we are a dealer or a person receiving a selling concession, fee or other remuneration in respect of the Notes, and the proposed transfer takes place during the
Restricted Period (as defined in the Indenture), or we are an officer or director of the Company or an Initial Purchaser (as defined in the Indenture), we certify that the proposed transfer is being made in accordance with the provisions of Rule
904(b) of Regulation S. 

  

	 	 ̈ B.	This Certificate relates to our proposed exchange of $             principal amount of Notes issued
under the Indenture for an equal principal amount of Notes to be held by us. We hereby certify as follows: 

  

	 	1.	At the time the offer and sale of the Notes was made to us, either (i) we were not in the United States or (ii) we were excluded from the definition of
“U.S. person” pursuant to Rule 902(k)(2)(vi) or the account held by us for which we were acting was excluded from the definition of “U.S. person” pursuant to Rule 902(k)(2)(i) under the circumstances described in Rule 902(h)(3);
and we were not a member of an identifiable group of U.S. citizens abroad. 

  

	 	2.	Unless the circumstances described in paragraph 1(ii) above are applicable, either (a) at the time our buy order was originated, we were outside the United States
or (b) the transaction was executed in, on or through the facilities of a designated offshore securities market and we did not pre-arrange the transaction in the United States. 

  
 D-2

	 	3.	The proposed exchange of Notes is not part of a plan or scheme to evade the registration requirements of the Securities Act. 

You and the Company are entitled to rely upon this Certificate and are irrevocably authorized to produce this Certificate or a copy
hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby. 
  

			
	Very truly yours,
		
		 	 [NAME OF PURCHASER (FOR
 TRANSFERS) OR OWNER (FOR
 EXCHANGES)]

		 	

 
			
	By:	 	 
		 	 Name:
 Title:

Address:

 Date:
                     

  
 D-3

 EXHIBIT E 
 Rule 144A Certificate 

                ,
             
 Wilmington Trust, National Association 

246 Goose Lane, Suite 105 
 Guilford, CT 06347

 Attention: Unit Corporation Adminstrator 
  

	 	Re:	Unit Corporation 

6.625% Subordinated 
 Notes due 2021 (the “Notes”) 
 Issued under the
Indenture (the “Indenture”) dated as as 
 of July 24, 2012 relating to the
Notes                                        

 Ladies and Gentlemen: 
 TO BE COMPLETED BY PURCHASER IF (1) ABOVE IS CHECKED. 
 This Certificate
relates to: 
 [CHECK A OR B AS APPLICABLE.] 

 

	 	 ̈ A.	Our proposed purchase of $             principal amount of Notes issued under the Indenture.

  

	 	 ̈ B.	Our proposed exchange of $             principal amount of Notes issued under the Indenture for an
equal principal amount of Notes to be held by us. 

 We and, if applicable, each account for which we are acting
in the aggregate owned and invested more than $100,000,000 in securities of issuers that are not affiliated with us (or such accounts, if applicable), as of             ,
20    , which is a date on or since close of our most recent fiscal year. We and, if applicable, each account for which we are acting, are a qualified institutional buyer within the meaning of Rule 144A (“Rule
144A”) under the Securities Act of 1933, as amended (the “Securities Act”). If we are acting on behalf of an account, we exercise sole investment discretion with respect to such account. We are aware that the transfer of Notes to us,
or such exchange, as applicable, is being made in reliance upon the exemption from the provisions of Section 5 of the Securities Act provided by Rule 144A. Prior to the date of this Certificate we have received such information regarding the
Company as we have requested pursuant to Rule 144A(d)(4) or have determined not to request such information. 

  
 E-1

 You and the Company are entitled to rely upon this Certificate and are irrevocably
authorized to produce this Certificate or a copy hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby. 

 

			
	 Very truly yours,
  

[NAME OF PURCHASER (FOR

    TRANSFERS) OR OWNER (FOR

    EXCHANGES)]

		
	By:	 	  

		 	Name:
		 	Title:
		 	Address:

 Date:
                     

  
 E-2Registration Rights Agreement

 EXHIBIT 4.3 

EXECUTION VERSION 
 REGISTRATION RIGHTS AGREEMENT 
 by and among 

Unit Corporation, 
 The Guarantors Listed on the Signature Page Hereof, 
 and 

Merrill Lynch, Pierce, Fenner & Smith Incorporated 

as representative of the Initial Purchasers 
 Dated as of July 24, 2012 

 REGISTRATION RIGHTS AGREEMENT 

This Registration Rights Agreement (this “Agreement”) is made and entered into as of July 24, 2012, by
and among Unit Corporation, a Delaware corporation (the “Company”), each of the guarantors named on the signature page hereto (collectively, the “Guarantors”), and Merrill Lynch, Pierce, Fenner & Smith Incorporated, on
behalf of itself and as Representative (the “Representative”) of each of the other Initial Purchasers named in Schedule A to the Purchase Agreement (as defined below) (collectively, the “Initial Purchasers”), each of whom has
agreed to purchase the Company’s 65/8% Senior Subordinated Notes due 2021 (the “Initial Notes”)
fully and unconditionally guaranteed by the Guarantors pursuant to the Purchase Agreement (as defined below). The Initial Notes and the Guarantees attached thereto are herein collectively referred to as the “Initial Securities.”

 This Agreement is made pursuant to the Purchase Agreement, dated July 12, 2012 (the “Purchase Agreement”), by
and among the Company, the Guarantors and the Representative, as representative of the Initial Purchasers, (i) for the benefit of the Initial Purchasers and (ii) for the benefit of the holders from time to time of the Securities, including
the Initial Purchasers. In order to induce the Initial Purchasers to purchase the Initial Securities, the Company has agreed to provide the registration rights set forth in this Agreement. The execution and delivery of this Agreement is a condition
to the obligations of the Initial Purchasers set forth in Section 5(h) of the Purchase Agreement. 
 The parties hereby
agree as follows: 
 SECTION 1. Definitions. As used in this Agreement, the following capitalized terms shall have
the following meanings: 
 Additional Interest: As defined in Section 5. 

Additional Interest Payment Date: With respect to the Initial Securities, each Interest Payment Date. 

Broker-Dealer: Any broker or dealer registered under the Exchange Act. 

Business Day: Any day other than a Saturday, Sunday or U.S. federal holiday or a day on which banking institutions or trust
companies located in New York, New York are authorized or obligated to be closed. 
 Closing Date: The date of this
Agreement. 
 Commission: The U.S. Securities and Exchange Commission. 

Consummate: A registered Exchange Offer shall be deemed “Consummated” for purposes of this Agreement upon the occurrence
of (i) the filing and effectiveness under the Securities Act of the Exchange Offer Registration Statement relating to the Exchange Securities to be issued in the Exchange Offer, (ii) the maintenance of such Registration Statement
continuously effective and the keeping of the Exchange Offer open for a period not less than the 

 
minimum period required pursuant to Section 3(b) hereof, and (iii) the delivery by the Company to the Registrar under the Indenture of Exchange Securities in the same aggregate
principal amount as the aggregate principal amount of Initial Securities that were tendered by Holders thereof pursuant to the Exchange Offer. 
 Exchange Act: The Securities Exchange Act of 1934, as amended, including the rules and regulations promulgated thereunder. 

Exchange Notes: The 65/8% Senior Subordinated Notes due 2021 to be issued under the Existing Indenture to Holders in exchange for Transfer
Restricted Securities pursuant to this Agreement. 
 Exchange Offer: The registration by the Company and the Guarantors
under the Securities Act of the Exchange Securities pursuant to a Registration Statement pursuant to which the Company and the Guarantors shall offer the Holders of all outstanding Transfer Restricted Securities the opportunity to exchange all such
outstanding Transfer Restricted Securities held by such Holders for Exchange Securities in an aggregate principal amount equal to the aggregate principal amount of the Transfer Restricted Securities tendered in such exchange offer by such Holders
and with terms that are substantially identical to the Transfer Restricted Securities except that they will not be subject to special mandatory redemption or to the restrictions on transfer or to any increase in interest rate pursuant to the terms
of this Agreement. 
 Exchange Offer Registration Statement: Any Registration Statement relating to an Exchange Offer,
including the related Prospectus. 
 Exchange Securities: The Exchange Notes and the Guarantees attached thereto.

 Existing Indenture: The Indenture, as supplemented by the First Supplemental Indenture thereto, each dated as of
May 18, 2011, by and between the Company, the guarantors named therein and Wilmington Trust, National Association (f/k/a Wilmington Trust, FSB), as trustee (the “Existing Trustee”), pursuant to which the Exchange Securities are to be
issued, as such Indenture is amended or supplemented from time to time in accordance with the terms thereof. 
 FINRA:
Financial Institutions Regulatory Authority, Inc. 
 Guarantees: As defined in the Purchase Agreement. 

Holders: As defined in Section 2(b) hereof. 
 Indemnified Holder: As defined in Section 8(a) hereof. 
 Indenture:
The Indenture, as supplemented by the First Supplemental Indenture thereto, each dated as of July 24, 2012, by and between the Company, the Guarantors and Wilmington Trust, National Association, as trustee (the “Trustee”),
pursuant to which the Initial Securities are to be issued, as such Indenture is amended or supplemented from time to time in accordance with the terms thereof. 

  
 -2-

 Initial Notes: As defined in the preamble hereto, but only for so long as such
securities constitute Transfer Restricted Securities. 
 Initial Placement: The issuance and sale by the Company of the
Initial Securities to the Initial Purchasers pursuant to the Purchase Agreement. 
 Initial Purchaser: As defined in the
preamble hereto. 
 Initial Securities: As defined in the preamble hereto. 

Interest Payment Date: As defined in the Indenture and the applicable Securities. 

Person: An individual, partnership, limited liability company, corporation, trust or unincorporated organization, or other legal
entity, or a government or agency or political subdivision thereof. 
 Prospectus: The prospectus included in a
Registration Statement, as amended or supplemented by any prospectus supplement and by all other amendments thereto, including post-effective amendments, and all material incorporated by reference into such Prospectus. 

Registration Default: As defined in Section 5 hereof. 

Registration Statement: Any registration statement of the Company relating to (a) an offering of Exchange Securities pursuant
to an Exchange Offer or (b) the registration for resale of Transfer Restricted Securities pursuant to the Shelf Registration Statement, which is filed pursuant to the provisions of this Agreement, in each case, including the Prospectus included
therein, all amendments and supplements thereto (including post-effective amendments) and all exhibits and material incorporated by reference therein. 
 Securities: The Initial Securities and the Exchange Securities. 

Securities Act: The Securities Act of 1933, as amended, including the rules and regulations promulgated thereunder. 

Shelf Obligation Trigger Date: The earliest to occur of (i) the date on which the Company determines that
an Exchange Offer is not permitted by applicable law or Commission policy, (ii) if for any reason the Exchange Offer is not Consummated before 271 days after the Closing Date (or if the
270th day is not a Business Day, the next succeeding
Business Day), the 271st day (or such later succeeding
Business Day) after the Closing Date and (iii) the first date after notice of the Exchange Offer is mailed to Holders upon which the Company receives notice from a Holder of Transfer Restricted Securities as contemplated by
Section 4(a)(iii) hereof. 
 Shelf Registration Statement: As defined in Section 4(a) hereof. 

Transfer Restricted Securities: Each Initial Security, until the earliest to occur of (a) the date on which such Initial
Security is exchanged in the Exchange Offer for an Exchange Security entitled to be resold to the public by the Holder thereof without complying with the prospectus delivery requirements of the Securities Act (or, in the case of a Holder that is not
described in 

  
 -3-

 
Section 4(a)(iii) hereof, the date an Exchange Offer is Consummated in accordance with this Agreement which such Holder was not prohibited from participating in), (b) the date on which
such Initial Security has been effectively registered under the Securities Act and disposed of in accordance with a Shelf Registration Statement and (c) the date on which such Initial Security is distributed to the public pursuant to Rule 144
of the Securities Act or by a Broker-Dealer pursuant to the “Plan of Distribution” contemplated by the Exchange Offer Registration Statement (including delivery of the Prospectus contained therein). 

Trust Indenture Act: The Trust Indenture Act of 1939, as amended, including the rules and regulations promulgated thereunder.

 Underwritten Registration or Underwritten Offering: A registration in which securities of the Company are sold to an
underwriter for reoffering to the public. 
 SECTION 2. Securities Subject to this Agreement. 

(a) Transfer Restricted Securities. The securities entitled to the benefits of this Agreement are the Transfer Restricted
Securities. 
 (b) Holders of Transfer Restricted Securities. A Person is deemed to be a holder of Transfer Restricted
Securities (each, a “Holder”) whenever such Person owns Transfer Restricted Securities. 
 SECTION 3.
Registered Exchange Offer. 
 (a) Unless the Exchange Offer shall not be permissible under applicable law or Commission
policy, the Company and the Guarantors shall use commercially reasonable efforts to (i) file with the Commission an Exchange Offer Registration Statement under the Securities Act relating to the Exchange Securities and the Exchange Offer,
(ii) cause such Registration Statement to become effective, (iii) in connection with the foregoing, file (A) all pre-effective amendments to such Registration Statement as may be necessary in order to cause such Registration Statement
to become effective, (B) if applicable, a post-effective amendment to such Registration Statement pursuant to Rule 430A under the Securities Act and (C) cause all necessary filings in connection with the registration and qualification of
the Exchange Securities to be made under the state securities or blue sky laws of such jurisdictions as are necessary to permit Consummation of the Exchange Offer, and (iv) upon the effectiveness of such Registration Statement, commence the
Exchange Offer. The Exchange Offer Registration Statement shall be on the appropriate form permitting registration of the Exchange Securities to be offered in exchange for the Transfer Restricted Securities and to permit resales of Initial
Securities held by Broker-Dealers as contemplated by Section 3(c) hereof. 
 (b) If an Exchange Offer Registration
Statement is required pursuant to Section 3(a) above, the Company and the Guarantors each shall use its commercially reasonable efforts to (i) cause the Exchange Offer Registration Statement to be effective continuously and (ii) keep
the Exchange Offer open for a period of not less than the minimum period required under applicable federal and state securities laws to Consummate the Exchange Offer; provided, however, that in no event shall such period be less than 30 days
after the date notice of the Exchange Offer is 

  
 -4-

 
mailed to the Holders. The Company shall cause the Exchange Offer to comply with all applicable federal and state securities laws. No securities other than the Exchange Securities shall be
included in the Exchange Offer Registration Statement. The Company and the Guarantors each shall use its commercially reasonable efforts to cause the Exchange Offer to be Consummated before 271 days after the Closing Date (or if the 270th day is not
a Business Day, the next succeeding Business Day). 
 (c) The Company shall indicate in a “Plan of Distribution”
section contained in the Prospectus forming a part of the Exchange Offer Registration Statement that any Broker-Dealer who holds Initial Securities that are Transfer Restricted Securities and that were acquired for its own account as a result of
market-making activities or other trading activities (other than Transfer Restricted Securities acquired directly from the Company), may exchange such Initial Securities pursuant to the Exchange Offer; however, such Broker-Dealer may be deemed to be
an “underwriter” within the meaning of the Securities Act and must, therefore, deliver a prospectus meeting the requirements of the Securities Act in connection with any resales of the Exchange Securities received by such Broker-Dealer in
the Exchange Offer, which prospectus delivery requirement may be satisfied by the delivery by such Broker-Dealer of the Prospectus contained in the Exchange Offer Registration Statement. Such “Plan of Distribution” section shall also
contain all other information with respect to such resales by Broker-Dealers that the Commission may require in order to permit such resales pursuant thereto, but such “Plan of Distribution” shall not name any such Broker-Dealer or
disclose the amount of Initial Securities held by any such Broker-Dealer except to the extent required by the Commission. 
 If
an Exchange Offer Registration Statement is required pursuant to Section 3(a) above, the Company and the Guarantors each shall use its commercially reasonable efforts to keep the Exchange Offer Registration Statement continuously effective,
supplemented and amended as required by the provisions of Section 6(c) hereof to the extent necessary to ensure that it is available for resales of Initial Securities acquired by Broker-Dealers for their own accounts as a result of
market-making activities or other trading activities, and to ensure that it conforms with the requirements of this Agreement, the Securities Act and the policies, rules and regulations of the Commission as announced from time to time, for a period
ending on the earlier of (i) 180 days from the date on which the Exchange Offer Registration Statement is declared effective and (ii) the date on which a Broker-Dealer is no longer required to deliver a prospectus in connection with
market-making or other trading activities. 
 The Company shall provide sufficient copies of the latest version of such
Prospectus to Broker-Dealers promptly upon request at any time during such 180-day (or shorter as provided in the foregoing sentence) period in order to facilitate such resales. 

SECTION 4. Shelf Registration. 
 (a) Shelf Registration. If (i) the Exchange Offer is not permitted by applicable law or Commission policy, (ii) for any reason the Exchange Offer is not Consummated before 271 days after
the Closing Date (or if the 270th day is not a Business Day, the next succeeding Business Day), or (iii) any Holder of Transfer Restricted Securities notifies the Company before the 20th day following Consummation of the Exchange Offer of the
fact that (A) such Holder is prohibited by applicable law or Commission policy from participating in the Exchange Offer, or 

  
 -5-

 
(B) such Holder may not resell the Exchange Notes acquired by it in the Exchange Offer to the public without delivering a prospectus (other than because such Holder is an affiliate of the
Company) and that the Prospectus contained in the Exchange Offer Registration Statement is not appropriate or available for such resales by such Holder, or (C) such Holder is a Broker-Dealer and holds Initial Securities acquired directly from
the Company or one of its affiliates, then, upon such Holder’s written request, the Company and the Guarantors shall 
 (x) cause to be filed a shelf registration statement pursuant to Rule 415 under the Securities Act, which may be an amendment to the Exchange Offer Registration Statement (in either event, the “Shelf
Registration Statement”) before the 61st day after the Shelf Obligation Trigger Date (or if the 60th day is not a Business Day, the next succeeding Business Day), which Shelf Registration Statement shall provide for resales of all Transfer
Restricted Securities the Holders of which shall have provided the information required pursuant to Section 4(b) hereof; and 
 (y) use their commercially reasonable efforts to cause such Shelf Registration Statement to be declared effective by the Commission on or before 121 days after the Shelf Obligation Trigger Date (or if the
120th day is not a Business Day, the next succeeding Business Day). 
 The Company and the Guarantors each shall use its
commercially reasonable efforts to keep such Shelf Registration Statement continuously effective, supplemented and amended as required by the provisions of Sections 6(b) and (c) hereof to the extent necessary to ensure that it is available for
resales of Initial Securities by the Holders of Transfer Restricted Securities entitled to the benefit of this Section 4(a), and to ensure that it conforms with the requirements of this Agreement, the Securities Act and the policies, rules and
regulations of the Commission as announced from time to time, for a period of at least one year following the effective date of such Shelf Registration Statement (or shorter period that will terminate when all the Initial Securities covered by such
Shelf Registration Statement have been sold pursuant to such Shelf Registration Statement). 
 (b) Provision by Holders of
Certain Information in Connection with the Shelf Registration Statement. No Holder of Transfer Restricted Securities may include any of its Transfer Restricted Securities in any Shelf Registration Statement pursuant to this Agreement unless and
until such Holder furnishes to the Company in writing, within 20 Business Days after receipt of a request therefor, such information as the Company may reasonably request for use in connection with any Shelf Registration Statement or Prospectus or
preliminary Prospectus included therein or any amendment or supplement thereto. Each Holder as to which any Shelf Registration Statement is being effected agrees to furnish promptly to the Company all information required to be disclosed in order to
make the information previously furnished to the Company by such Holder not materially misleading. 
 SECTION 5.
Additional Interest. If (i) the Exchange Offer has not been Consummated before 271 days after the Closing Date (or if the 270th day is not a Business Day, the next succeeding Business Day), (ii) the Company and the Guarantors are
obligated to file a Shelf Registration Statement pursuant to Section 4 hereof and the Shelf Registration Statement has not been declared effective by the Commission before 121 days after the Shelf Obligation Trigger

  
 -6-

 
Date (or if the 120th day is not a Business Day, the next succeeding Business Day), or (iii) any Registration Statement required by this Agreement is filed and declared effective but shall
thereafter cease to be effective or fail to be usable in connection with the exchange or resale of Transfer Restricted Securities for the period specified in Section 3 or 4 of this Agreement, as applicable, without being succeeded reasonably
promptly by a post-effective amendment to such Registration Statement that cures such failure and that is itself immediately declared or automatically effective (each such event referred to in clauses (i) through (iii), a “Registration
Default”), the Company hereby agrees that the interest rate borne by the Transfer Restricted Securities shall be increased by 0.25% per annum during the 90-day period immediately following the occurrence of any Registration Default and
shall increase by 0.25% per annum at the end of each subsequent 90-day period, but in no event shall such increases exceed 1.00% per annum (any such increase or, if applicable, the aggregate amount of such increases in interest rate,
“Additional Interest”). Following the cure of all Registration Defaults relating to any particular Transfer Restricted Securities, the interest rate borne by the relevant Transfer Restricted Securities will be reduced to the original
interest rate borne by such Transfer Restricted Securities; provided, however, that, if after any such reduction in interest rate, a different Registration Default occurs, the interest rate borne by the relevant Transfer Restricted Securities
shall again be increased pursuant to the foregoing provisions. 
 Notwithstanding the foregoing, (i) the amount of
Additional Interest payable shall not increase because more than one Registration Default has occurred and is pending and (ii) a Holder of Transfer Restricted Securities that is not entitled to the benefits of the Shelf Registration Statement
(because, e.g., such Holder has not elected to include information or has not timely delivered such information to the Company pursuant to Section 4(b) hereof) shall not be entitled to Additional Interest with respect to a Registration Default
that pertains to the Shelf Registration Statement. 
 All obligations of the Company and the Guarantors set forth in the
preceding paragraph that are outstanding with respect to any Transfer Restricted Security at the time such security ceases to be a Transfer Restricted Security shall survive until such time as all such obligations with respect to such security shall
have been satisfied in full. 
 SECTION 6. Registration Procedures. 

(a) Exchange Offer Registration Statement. In connection with the Exchange Offer, the Company and the Guarantors shall comply with
all of the provisions of Section 6(c) hereof, and shall use their commercially reasonable efforts to effect such exchange to permit the sale of Transfer Restricted Securities being sold in accordance with the intended method or methods of
distribution thereof. As a condition to its participation in the Exchange Offer pursuant to the terms of this Agreement, each Holder of Transfer Restricted Securities shall furnish, upon the request of the Company, prior to the Consummation thereof,
a written representation to the Company (which may be contained in the letter of transmittal contemplated by the Exchange Offer Registration Statement) to the effect that (A) it is not an affiliate of the Company, (B) it is not engaged in,
and does not intend to engage in, and has no arrangement or understanding with any Person to participate in, a distribution of the Exchange Securities to be issued in the Exchange Offer and (C) it is acquiring the Exchange Securities in its
ordinary course of business. 

  
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In addition, all such Holders of Transfer Restricted Securities shall otherwise cooperate in the Company’s preparations for the Exchange Offer. Each Holder will be required to acknowledge
and agree that any Broker-Dealer and any such Holder using the Exchange Offer to participate in a distribution of the securities to be acquired in the Exchange Offer (1) could not under Commission policy as in effect on the date of this
Agreement rely on the position of the Commission enunciated in Morgan Stanley and Co., Inc. (available June 5, 1991) and Exxon Capital Holdings Corporation (available May 13, 1988), as interpreted in the Commission’s
letter to Shearman & Sterling dated July 2, 1993, and similar no-action letters, and (2) must comply with the registration and prospectus delivery requirements of the Securities Act in connection with a secondary resale
transaction and that such a secondary resale transaction should be covered by an effective registration statement containing the selling security holder information required by Item 507 or 508, as applicable, of Regulation S-K if the resales
are of Exchange Securities obtained by such Holder in exchange for Initial Securities acquired by such Holder directly from the Company. 
 (b) Shelf Registration Statement. If required to file a Shelf Registration Statement pursuant to Section 4 hereof, the Company and the Guarantors each shall comply with all the provisions of
Section 6(c) hereof and shall use its commercially reasonable efforts to effect such registration (unless automatically declared effective) to permit the sale of the Transfer Restricted Securities being sold in accordance with the intended
method or methods of distribution thereof, and pursuant thereto the Company and the Guarantors each will as expeditiously as is commercially reasonable prepare and file with the Commission a Registration Statement relating to the registration on any
appropriate form under the Securities Act, which form shall be available for the sale of the Transfer Restricted Securities in accordance with the intended method or methods of distribution thereof. 

(c) General Provisions. In connection with any Registration Statement and any Prospectus required by this Agreement to permit the
sale or resale of Transfer Restricted Securities (including, without limitation, any Registration Statement and the related Prospectus required to permit resales of Initial Securities by Broker-Dealers), the Company and the Guarantors each shall:

 (i) use its commercially reasonable efforts to keep such Registration Statement continuously effective during
the period set forth in Sections 3 and 4 hereof, as applicable, and provide all requisite financial statements (including, if required by the Securities Act or any regulation thereunder, financial statements of the Guarantors for the period
specified in Section 3 or 4 of this Agreement, as applicable); upon the occurrence of any event that would cause any such Registration Statement or the Prospectus contained therein (A) to contain a material misstatement or omission or
(B) not to be effective and usable for resale of Transfer Restricted Securities during the period required by this Agreement, the Company shall file reasonably promptly an appropriate amendment to such Registration Statement, in the case of
clause (A), correcting any such misstatement or omission, and, in the case of either clause (A) or (B), use its commercially reasonable efforts to cause such amendment to be declared or become automatically effective and such Registration
Statement and the related Prospectus to become usable for their intended purpose(s) as soon as practicable thereafter; 

  
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 (ii) prepare and file with the Commission such amendments and post-effective
amendments to such Registration Statement as may be necessary to keep such Registration Statement effective for the period set forth in Section 3 or 4 of this Agreement, as applicable, or such shorter period as will terminate when all Transfer
Restricted Securities covered by such Registration Statement have been sold; cause the Prospectus to be supplemented by any required Prospectus supplement, and as so supplemented to be filed pursuant to Rule 424 under the Securities Act, and to
comply fully with the applicable provisions of Rules 424 and 430A under the Securities Act in a timely manner; and comply with the provisions of the Securities Act with respect to the disposition of all securities covered by such Registration
Statement during the applicable period in accordance with the intended method or methods of distribution by the sellers thereof set forth in such Registration Statement or supplement to the Prospectus; 

(iii) advise the underwriter(s), if any, and selling Holders reasonably promptly and, if requested by such Persons, to
confirm such advice in writing, (A) when the Prospectus or any Prospectus supplement or post-effective amendment has been filed, and, with respect to any Registration Statement or any post-effective amendment thereto, when the same has become
effective, (B) of any request by the Commission for amendments to the Registration Statement or amendments or supplements to the Prospectus or for additional information relating thereto, (C) of the issuance by the Commission of any stop
order suspending the effectiveness of the Registration Statement under the Securities Act or of the suspension by any state securities commission of the qualification of the Transfer Restricted Securities for offering or sale in any jurisdiction, or
the initiation of any proceeding for any of the preceding purposes, or (D) of the existence of any fact or the happening of any event that makes any statement of a material fact made in the Registration Statement, the Prospectus, any amendment
or supplement thereto, or any document incorporated by reference therein untrue, or that requires the making of any additions to or changes in the Registration Statement or the Prospectus in order to make the statements therein not misleading. If at
any time the Commission shall issue any stop order suspending the effectiveness of the Registration Statement, or any state securities commission or other regulatory authority shall issue an order suspending the qualification or exemption from
qualification of the Transfer Restricted Securities under state securities or blue sky laws, the Company and the Guarantors each shall use its commercially reasonable efforts to obtain the withdrawal or lifting of such order at the earliest
practicable time; 
 (iv) furnish without charge to each of the Initial Purchasers, each selling Holder named in
any Registration Statement that has requested such copies, if any, and each of the underwriter(s), if any, before filing with the Commission, copies of any Registration Statement or any Prospectus included therein or any amendments or supplements to
any such Registration Statement or Prospectus (other than any documents that will be incorporated by reference in such Registration Statement or Prospectus), which documents will be subject to the review and comment of such requesting Holders and
underwriter(s) in connection with such sale, if any, for a period of at least five Business Days, and the Company will not file any such Registration Statement or Prospectus or any such amendment or supplement to any such Registration Statement or

  
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Prospectus to which an Initial Purchaser of Transfer Restricted Securities covered by such Registration Statement or the underwriter(s), if any, shall reasonably object in writing within five
Business Days after the receipt thereof (such objection to be deemed timely made upon confirmation of telecopy transmission within such period). The objection of an Initial Purchaser or underwriter, if any, shall be deemed to be reasonable if such
Registration Statement, amendment, Prospectus or supplement, as applicable, as proposed to be filed, contains a material misstatement or omission; 
 (v) make representatives of the Company and the Guarantors reasonably available to the Initial Purchasers for customary due diligence matters, subject to customary confidentiality agreements; 

(vi) make available, subject to customary confidentiality agreements, at reasonable times for inspection by the Initial
Purchasers, any managing underwriter(s), if any, participating in any disposition pursuant to such Registration Statement and any attorney or accountant retained by such Initial Purchasers or any of the underwriter(s), all financial and other
records, pertinent corporate documents and properties of each of the Company and the Guarantors and cause the Company’s and the Guarantors’ officers, directors and employees to supply all information, in each case as shall be reasonably
necessary to enable any such Initial Purchaser, underwriter, attorney or accountant to exercise any applicable responsibilities in connection with such Registration Statement or any post-effective amendment thereto subsequent to the filing thereof
and prior to its effectiveness and to participate in meetings with investors to the extent requested by the managing underwriter(s), if any; 
 (vii) if requested by any selling Holders listed as a selling securityholder in any Registration Statement or the underwriter(s), if any, promptly incorporate in any Registration Statement or Prospectus,
pursuant to a supplement or post-effective amendment if necessary, such appropriate information as such selling Holders and underwriter(s), if any, may reasonably request to have included therein, including, without limitation, information relating
to the “Plan of Distribution” of the Transfer Restricted Securities, information with respect to the principal amount of Transfer Restricted Securities being sold to such underwriter(s), the purchase price being paid therefor and any other
terms of the offering of the Transfer Restricted Securities to be sold in such offering; and make all required filings of such Prospectus supplement or post-effective amendment as soon as practicable after the Company is notified of the matters to
be incorporated in such Prospectus supplement or post-effective amendment; 
 (viii) use commercially reasonable
efforts to cause the Transfer Restricted Securities covered by the Registration Statement to be rated with Standard and Poor’s and Moody’s, if so requested by the Holders of a majority in aggregate principal amount of Securities covered
thereby or the underwriter(s), if any; 
 (ix) furnish to each Initial Purchaser, each selling Holder and each of
the underwriter(s), if any, without charge, at least one copy of the Registration Statement, as first filed with the Commission, and of each amendment thereto, including financial statements and schedules, all documents incorporated by reference
therein and all exhibits (including exhibits incorporated therein by reference), unless, in each case, publicly available; 

  
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 (x) deliver to each selling Holder and each of the underwriter(s), if any,
without charge, as many copies of the Prospectus (including each preliminary prospectus) and any amendment or supplement thereto as such Persons reasonably may request; the Company and the Guarantors each hereby consents to the use of the Prospectus
and any amendment or supplement thereto by each of the selling Holders and each of the underwriter(s), if any, in connection with the offering and the sale of the Transfer Restricted Securities covered by the Prospectus or any amendment or
supplement thereto; 
 (xi) enter into such customary agreements (including an underwriting agreement in the case
of an Underwritten Registration), and make such customary representations and warranties, and take all such other customary actions in connection therewith in order to expedite or facilitate the disposition of the Transfer Restricted Securities
pursuant to any Registration Statement contemplated by this Agreement, all to such extent as may be reasonably requested by any Initial Purchaser or by any Holder of Transfer Restricted Securities or underwriter (in the case of an Underwritten
Registration) in connection with any sale or resale pursuant to any Registration Statement contemplated by this Agreement; and in the case of an Underwritten Registration, the Company and the Guarantors each shall: 

(A) furnish to each underwriter, if any, in such substance and scope as they may request and as are customarily made by
issuers to underwriters in primary underwritten offerings, upon the date of the consummation of an Underwritten Offering: 
 (1) a certificate, dated the date of consummation of an Underwritten Offering, signed by (y) the President or any Vice President and (z) a principal financial or accounting officer of each of
the Company and the Guarantors, confirming, as of the date thereof, the matters set forth in paragraphs (i), (ii) and (iii) of Section 5(g) of the Purchase Agreement and such other customary matters as such parties may reasonably
request; 
 (2) an opinion, dated the date of consummation of an Underwritten Offering, of counsel for the
Company and the Guarantors, covering such matters set forth in Exhibits C and D of the Purchase Agreement and such other customary matters as such parties may reasonably request, and in any event including a statement to the effect that such counsel
for the Company and the Guarantors has participated in conferences with officers and other representatives of the Company and the Guarantors, representatives of the independent public accountants and independent reserve engineers for the Company and
the Guarantors, representatives of the underwriter(s), if any, and counsel to the underwriter(s), if any, in connection with the preparation of such Registration Statement and the related Prospectus and have considered the matters required to be
stated therein and the statements contained therein, 

  
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although such counsel has not independently verified the accuracy, completeness or fairness of such statements; and that such counsel advises that, on the basis of the foregoing, no facts came to
such counsel’s attention that caused such counsel to believe that the applicable Registration Statement, at the time such Registration Statement or any post-effective amendment thereto became effective, and, in the case of the Exchange Offer
Registration Statement, as of the date of Consummation, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading, or that the
Prospectus contained in such Registration Statement as of its date (and, in the case of an Exchange Offer Registration Statement used in an Underwritten Offering, as of the date of Consummation), contained an untrue statement of a material fact or
omitted to state a material fact necessary in order to make the statements therein not misleading. Without limiting the foregoing, such counsel may state further that such counsel assumes no responsibility for, and has not independently verified,
the accuracy, completeness or fairness of the financial statements, notes and schedules and other financial data or reserve data included in any Registration Statement contemplated by this Agreement or the related Prospectus; 

(3) a comfort letter from the Company’s independent accountants, in the customary form and covering matters of the
type customarily requested to be covered in comfort letters by underwriters in connection with primary underwritten offerings; and 
 (4) a reserve report confirmation letter from the Company’s independent reserve engineers, in the customary form and covering matters of the type customarily requested to be covered in reserve report
confirmation letters by underwriters in connection with primary underwritten offerings; 
 (B) set forth in full
or incorporate by reference in the underwriting agreement, if any, the indemnification provisions and procedures of Section 8 hereof with respect to all parties to be indemnified pursuant to said Section; and 

(C) deliver such other documents and certificates as may be reasonably requested by such parties to evidence compliance
with clause (A) above and with any customary conditions contained in the underwriting agreement or other agreement entered into by the Company or any of the Guarantors pursuant to this clause, if any. 

If at any time the representations and warranties of the Company and the Guarantors contemplated in clause (A)(1) above
cease to be true and correct, the Company or the Guarantors shall so advise the Initial Purchasers and the underwriter(s), if any, and each selling Holder reasonably promptly and, if requested by such Persons, shall confirm such advice in writing;

  
 -12-

 (xii) prior to any public offering of Transfer Restricted Securities,
cooperate with the selling Holders, the underwriter(s), if any, and their respective counsel in connection with the registration and qualification of the Transfer Restricted Securities under the state securities or blue sky laws of such
jurisdictions as the selling Holders or underwriter(s), if any, may reasonably request and do any and all other acts or things necessary or advisable to enable the disposition in such jurisdictions of the Transfer Restricted Securities covered by
the Shelf Registration Statement; provided, however, that none of the Company or any Guarantor shall be required to register or qualify as a foreign corporation where it is not then so qualified or to take any action that would subject it to
the service of process in suits or to taxation, other than as to matters and transactions relating to the Registration Statement, in any jurisdiction where it is not then so subject; 

(xiii) shall issue, upon the request of any Holder of Initial Securities covered by the Shelf Registration Statement,
Exchange Securities having an aggregate principal amount equal to the aggregate principal amount of Initial Securities surrendered to the Company by such Holder in exchange therefor or being sold by such Holder; such Exchange Securities to be
registered in the name of such Holder or in the name of the purchasers of such Exchange Securities, as the case may be; in return, the Initial Securities held by such Holder shall be surrendered to the Company for cancellation; 

(xiv) subject to the terms of the Indenture, cooperate with the selling Holders and the underwriter(s), if any, to
facilitate the timely preparation and delivery of certificates or book-entry receipts, as applicable, representing Transfer Restricted Securities to be sold and not bearing any restrictive legends; and enable such Transfer Restricted Securities, or
book-entry receipts, as applicable, to be in such denominations and registered in such names as the Holders or the underwriter(s), if any, may request at least two Business Days prior to any sale of Transfer Restricted Securities made by such
Holders or underwriter(s); 
 (xv) use its commercially reasonable efforts to cause the Transfer Restricted
Securities covered by such Registration Statement to be registered with or approved by such other governmental agencies or authorities as may be necessary to enable the seller or sellers thereof or the underwriter(s), if any, to consummate the
disposition of such Transfer Restricted Securities, subject to the proviso contained in clause (xii) above; 

(xvi) if any fact or event contemplated by Section 6(c)(iii)(D) above shall exist or have occurred, prepare a
supplement or post-effective amendment to such Registration Statement or related Prospectus or any document incorporated therein by reference or file any other required document so that, as thereafter delivered to the purchasers of Transfer
Restricted Securities, the Prospectus will not contain an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein not misleading; 

(xvii) provide a CUSIP number for all Securities not later than the effective date of the Registration Statement covering
such Securities and provide the Trustee under the Existing Indenture with one or more global notes for such Securities which are in a form eligible for deposit with the Depository Trust Company and take all other action necessary to ensure that all
such Securities are eligible for deposit with the Depository Trust Company; 

  
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 (xviii) cooperate and assist in any filings required to be made with the
FINRA and in the performance of any due diligence investigation by any underwriter (including any “qualified independent underwriter”) that is required to be retained in accordance with the rules and regulations of the FINRA; 

(xix) otherwise use its commercially reasonable efforts to comply with all applicable rules and regulations of the
Commission, and make generally available to its security holders, as soon as practicable, a consolidated earnings statement meeting the requirements of Rule 158 (which need not be audited) for the twelve-month period (A) commencing at the end
of any fiscal quarter in which Transfer Restricted Securities are sold to underwriters in a firm commitment or best efforts Underwritten Offering or (B) if not sold to underwriters in such an offering, beginning with the first month of the
Company’s first fiscal quarter commencing after the effective date of such Registration Statement; 
 (xx)
cause the Existing Indenture to be qualified under the Trust Indenture Act not later than the effective date of the first Registration Statement required by this Agreement, and, in connection therewith, cooperate with the Existing Trustee and the
Holders of Securities to effect such changes to the Existing Indenture as may be required for such Existing Indenture to be so qualified in accordance with the terms of the Trust Indenture Act; and to execute and use its commercially reasonable
efforts to cause the Existing Trustee to execute, all documents that may be required to effect such changes and all other forms and documents required to be filed with the Commission to enable such Existing Indenture to be so qualified in a timely
manner; 
 (xxi) if the notes issued under the Existing Indenture on May 18, 2011 are then listed on a
securities exchange, use commercially reasonable efforts to cause all Securities covered by the Registration Statement to be listed on each such securities exchange if requested by the Holders of a majority in aggregate principal amount of Initial
Securities or the managing underwriter(s), if any; and 
 (xxii) if not publicly available, provide promptly to
each Holder upon request each document filed with the Commission pursuant to the requirements of Section 13 and Section 15 of the Exchange Act. 
 Each Holder agrees by acquisition of a Transfer Restricted Security that, upon receipt of any notice from the Company of the existence of any fact of the kind described in Section 6(c)(iii)(D)
hereof, such Holder will forthwith discontinue disposition of Transfer Restricted Securities pursuant to the applicable Registration Statement until such Holder’s receipt of the copies of the supplemented or amended Prospectus contemplated by
Section 6(c)(xvi) hereof, or until it is advised in writing (the “Advice”) by the Company that the use of the Prospectus may be resumed, and has received copies of any additional or supplemental filings that are incorporated by
reference in the Prospectus. If so directed by the Company, each Holder will 

  
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deliver to the Company (at the Company’s expense) all copies, other than permanent file copies then in such Holder’s possession, of the Prospectus covering such Transfer Restricted
Securities that was current at the time of receipt of such notice. In the event the Company shall give any such notice, the time period regarding the effectiveness of such Registration Statement set forth in Section 3 or 4 hereof, as
applicable, shall be extended by the number of days during the period from and including the date of the giving of such notice pursuant to Section 6(c)(iii)(D) hereof to and including the date when each selling Holder covered by such
Registration Statement shall have received the copies of the supplemented or amended Prospectus contemplated by Section 6(c)(xvi) hereof or shall have received the Advice; provided, however, that no such extension shall be taken into
account in determining whether Additional Interest is due pursuant to Section 5 hereof or the amount of such Additional Interest, it being agreed that the Company’s option to suspend use of a Registration Statement pursuant to this
paragraph shall be treated as a Registration Default for purposes of Section 5 hereof. 
 SECTION 7. Registration
Expenses. 
 (a) All expenses incident to the Company’s and the Guarantors’ performance of or compliance with this
Agreement will be borne by the Company and the Guarantors, jointly and severally, regardless of whether a Registration Statement becomes effective, including, without limitation: (i) all registration and filing fees and expenses (including
filings made by any Initial Purchaser or Holder with the FINRA (and, if applicable, the fees and expenses of any “qualified independent underwriter” and its counsel that may be required by the rules and regulations of the FINRA));
(ii) all fees and expenses of compliance with federal securities and state blue sky or securities laws; (iii) all expenses of printing (including printing certificates for the Exchange Securities to be issued in the Exchange Offer and
printing of Prospectuses), messenger and delivery services and telephone; (iv) all fees and disbursements of counsel for the Company, the Guarantors and, solely under the circumstances described in Section 7(b) hereof, the Holders of
Transfer Restricted Securities; and (v) all fees and disbursements of independent certified public accountants of the Company and the Guarantors (including the expenses of any special audit and comfort letters required by or incident to such
performance). 
 The Company and the Guarantors each will, in any event, bear its internal expenses (including, without
limitation, all salaries and expenses of its officers and employees performing legal or accounting duties), the expenses of any annual audit and the fees and expenses of any Person, including special experts, retained by the Company or the
Guarantors. 
 (b) In connection with any Registration Statement required by this Agreement (including, without limitation, the
Exchange Offer Registration Statement and the Shelf Registration Statement), the Company and the Guarantors, jointly and severally, will reimburse the underwriters, if any, and the Holders of Transfer Restricted Securities being tendered in the
Exchange Offer and/or resold pursuant to the “Plan of Distribution” contained in the Exchange Offer Registration Statement or registered pursuant to the Shelf Registration Statement, as applicable, for the reasonable fees and disbursements
of not more than one counsel, who shall be Davis Polk & Wardwell LLP or such other counsel as may be chosen by the Holders of a majority in aggregate principal amount of the Transfer Restricted Securities for whose benefit such Registration
Statement is being prepared. 

  
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 SECTION 8. Indemnification. 

(a) The Company and the Guarantors, jointly and severally, agree, subject to the provisions set forth in this Section 8, to indemnify
and hold harmless (i) each Holder and (ii) each Person, if any, who controls (within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act) any Holder (any of the Persons referred to in this clause
(ii) being hereinafter referred to as a “controlling person”) and (iii) the respective officers, directors and employees of any Holder or any controlling person (any Person referred to in clause (i), (ii) or (iii) may
hereinafter be referred to as an “Indemnified Holder”), from and against any and all losses, claims, damages, liabilities, judgments, actions and reasonable expenses (including, without limitation, and as incurred, reimbursement of all
reasonable costs of investigating, preparing, pursuing, settling, compromising, paying or defending any claim or action, or any investigation or proceeding by any governmental agency or body, commenced or threatened, including the reasonable fees
and expenses of counsel to any Indemnified Holder), joint or several, to the extent based upon or arising out of any untrue statement or alleged untrue statement of a material fact contained in any Registration Statement or Prospectus (or any
amendment or supplement thereto), or any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such losses, claims, damages,
liabilities or expenses are caused by an untrue statement or omission or alleged untrue statement or omission that is made in reliance upon and in conformity with information relating to any of the Holders furnished in writing to the Company by any
of the Holders expressly for use therein. This indemnity agreement shall be in addition to any liability which the Company or any of the Guarantors may otherwise have. 
 In case any action or proceeding (including any governmental or regulatory investigation or proceeding) shall be brought or asserted against any of the Indemnified Holders with respect to which indemnity
may be sought against the Company or the Guarantors, such Indemnified Holder (or the Indemnified Holder controlled by such controlling person) shall promptly notify the Company and the Guarantors in writing (provided, however, that the
failure to give such notice shall not relieve the Company or the Guarantors of their respective obligations pursuant to this Agreement except to the extent that they have been materially prejudiced by such failure (through the forfeiture of
substantive rights and defenses) and shall not relieve the Company and the Guarantors from any liability that they may have to such Indemnified Holder other than under this Agreement). In case any such action is brought against any Indemnified
Holder and such Indemnified Holder seeks or intends to seek indemnity from the Company or the Guarantors, the Company will be entitled to participate in and, to the extent that it shall elect, by written notice delivered to such Indemnified Holder,
to assume the defense thereof with counsel reasonably satisfactory to such Indemnified Holder and the fees and expenses of such counsel shall be paid, as incurred, by the Company and the Guarantors; provided, however, if the defendants in any
such action include both an Indemnified Holder and the Company or the Guarantors and such Indemnified Holder shall have reasonably concluded that a conflict may arise between the positions of the Company or the Guarantors and such Indemnified Holder
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 Company or the Guarantors, such Indemnified Holder
shall have the right to select separate counsel to assume such legal defenses and to otherwise participate in the defense of such action 

  
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on behalf of such Indemnified Holder and the reasonable fees and expenses of such counsel shall be paid, as incurred, by the Company and the Guarantors. If the Company or the Guarantors do not
assume the defense in any such action within a reasonable time after the Company receives written notice thereof from such Indemnified Holder, such Indemnified Holder shall have the right to employ its own counsel in any such action and the
reasonable fees and expenses of such counsel shall be paid, as incurred, by the Company and the Guarantors (regardless of whether it is ultimately determined that an Indemnified Holder is not entitled to indemnification hereunder). The Company and
the Guarantors shall not, in connection with any one such action or proceeding or separate but substantially similar or related actions or proceedings in the same jurisdiction arising out of the same general allegations or circumstances, be liable
for the reasonable fees and expenses of more than one separate firm of attorneys (in addition to any local counsel) at any time for such Indemnified Holders, which firm shall be designated by the Holders. The Company and the Guarantors shall be
liable for any settlement of any such action or proceeding only if effected with the Company’s and the Guarantors’ prior written consent, which consent shall not be withheld unreasonably, and each of the Company and the Guarantors agrees
to indemnify and hold harmless any Indemnified Holder from and against any loss, claim, damage, liability or expense by reason of any settlement of any action effected with the written consent of the Company and the Guarantors. The Company and the
Guarantors shall not, without the prior written consent of each Indemnified Holder that is or could be party, settle or compromise or consent to the entry of judgment in or otherwise seek to terminate any pending or threatened action, claim,
litigation or proceeding in respect of which indemnification or contribution may be sought hereunder, unless such settlement, compromise, consent or termination (i) includes an unconditional release of each such Indemnified Holder from all
liability arising out of such action, claim, litigation 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 Holder. 

(b) Each Holder of Transfer Restricted Securities agrees, severally and not jointly, to indemnify and hold harmless the Company, the
Guarantors and their respective directors and officers who sign a Registration Statement, and any Person controlling (within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act) the Company or any of the
Guarantors, and the respective officers, directors and employees of each such Person, to the same extent as the foregoing indemnity from the Company and the Guarantors to each of the Indemnified Holders, but only with respect to losses, claims,
damages, liabilities, judgments, actions and reasonable expenses (including, without limitation, and as incurred, reimbursement of all reasonable costs of investigating, preparing, pursuing, settling, compromising, paying or defending any claim or
action, or any investigation or proceeding by any governmental agency or body, commenced or threatened, including the reasonable fees and expenses of counsel) to the extent based on or arising out of information relating to such Holder furnished in
writing by such Holder expressly for use in any Registration Statement. In case any action or proceeding shall be brought against the Company, the Guarantors or their respective directors or officers or any such controlling person in respect of
which indemnity may be sought against a Holder of Transfer Restricted Securities, such Holder shall have the rights and duties given the Company and the Guarantors, and the Company, the Guarantors, their respective directors and officers and such
controlling person shall have the rights and duties given to each Holder by the preceding paragraph. 

  
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 (c) If the indemnification provided for in this Section 8 is unavailable to an
indemnified party under Section 8(a) or (b) hereof (other than by reason of exceptions provided in those Sections) in respect of any losses, claims, damages, liabilities, judgments, actions or expenses referred to therein, then each
applicable indemnifying party, in lieu of indemnifying such indemnified party, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages, liabilities or expenses in such proportion as is
appropriate to reflect the relative benefits received by the Company and the Guarantors, on the one hand, and the Holders, on the other hand, from the Initial Placement (which in the case of the Company and the Guarantors shall be deemed to be equal
to the total gross proceeds to the Company and the Guarantors from the Initial Placement as set forth in the Offering Memorandum), the amount of Additional Interest which did not become payable as a result of the filing of the Registration Statement
resulting in such losses, claims, damages, liabilities, judgments actions or expenses, and such Registration Statement, or if such allocation is not permitted by applicable law, the relative fault of the Company and the Guarantors, on the one hand,
and the Holders, 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 fault of the Company and
the Guarantors, on the one hand, and of the Indemnified Holder, on the other hand, shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to
state a material fact relates to information supplied by the Company or any of the Guarantors, on the one hand, or the Indemnified Holders, 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 the
second paragraph of Section 8(a) hereof, any legal or other fees or expenses reasonably incurred by such party in connection with investigating or defending any action or claim. 

The Company, the Guarantors and each Holder of Transfer Restricted Securities agree that it would not be just and equitable if
contribution pursuant to this Section 8(c) were determined by pro rata allocation (even if the Holders 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 the immediately preceding paragraph. The amount paid or payable by an indemnified party as a result of the losses, claims, damages, liabilities or expenses referred to in the immediately preceding paragraph shall be deemed to include,
subject to the limitations set forth above, any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8, none
of the Holders (and their related Indemnified Holders) shall be required to contribute, in the aggregate, any amount in excess of the amount by which the total discount received by such Holder with respect to the Initial Securities exceeds the
amount of any damages which such Holder has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No Person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the Securities Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. The Holders’ obligations to contribute pursuant to this Section 8(c) are several in
proportion to the respective principal amount of Initial Securities held by each of the Holders hereunder and not joint. 

  
 -18-

 SECTION 9. Rule 144A. At any time when the Company is not subject to
Section 13 or 15 of the Exchange Act, the Company hereby agrees with each Holder, for so long as any Transfer Restricted Securities remain outstanding, to make available to any Holder or beneficial owner of Transfer Restricted Securities in
connection with any sale thereof and any prospective purchaser of such Transfer Restricted Securities from such Holder or beneficial owner, the information required by Rule 144A(d)(4) under the Securities Act in order to permit resales of such
Transfer Restricted Securities pursuant to Rule 144A under the Securities Act. 
 SECTION 10. Participation In
Underwritten Registrations. No Holder may participate in any Underwritten Registration hereunder unless such Holder (a) agrees to sell such Holder’s Transfer Restricted Securities on the basis provided in any underwriting arrangements
approved by the Persons entitled hereunder to approve such arrangements and (b) completes and executes all reasonable questionnaires, powers of attorney, indemnities, underwriting agreements, lock-up letters and other documents required under
the terms of such underwriting arrangements. 
 SECTION 11. Selection Of Underwriters. The Holders of Transfer
Restricted Securities covered by the Shelf Registration Statement who desire to do so may sell such Transfer Restricted Securities in an Underwritten Offering. In any such Underwritten Offering, the investment banker(s) and managing underwriter(s)
that will administer such offering will be selected by the Holders of a majority in aggregate principal amount of the Transfer Restricted Securities included in such offering; provided, however, that such investment banker(s) and
managing underwriter(s) must be reasonably satisfactory to the Company. In no event shall the Company be required to reimburse any Holder for any underwriting commissions or discounts. 

SECTION 12. Special Mandatory Redemption. If the Initial Notes are redeemed pursuant to Section 1.09 (Special Mandatory
Redemption) of the First Supplemental Indenture to the Indenture, this Agreement shall automatically terminate without further action by any party hereto on the Special Mandatory Redemption Date (as defined in the Indenture) and be of no further
force or effect. 
 SECTION 13. Miscellaneous. 

(a) Remedies. The Company and the Guarantors each hereby agrees that monetary damages would not be adequate compensation for any
loss incurred by reason of a breach by it of the provisions of this Agreement and hereby agree to waive the defense in any action for specific performance that a remedy at law would be adequate. 

(b) No Inconsistent Agreements. Each of the Company and the Guarantors will not, on or after the date of this Agreement enter into
any agreement with respect to its securities that conflicts with the provisions hereof. The rights granted to the Holders hereunder do not in any way conflict with and are not inconsistent with the rights granted to the holders of the Company’s
or any of the Guarantors’ securities under any agreement in effect on the date hereof. 

  
 -19-

 (c) Adjustments Affecting the Securities. The Company and the Guarantors will not
take any action, or permit any change to occur, with respect to the Securities that would materially and adversely affect the ability of the Holders to Consummate any Exchange Offer. 

(d) Amendments and Waivers. The provisions of this Agreement may not be amended, modified or supplemented, and waivers or consents
to or departures from the provisions hereof may not be given unless the Company has (i) in the case of Section 5 hereof and this Section 13(d)(i), obtained the written consent of Holders of all outstanding Transfer Restricted
Securities and (ii) in the case of all other provisions hereof, obtained the written consent of Holders of a majority of the outstanding aggregate principal amount of Transfer Restricted Securities (excluding any Transfer Restricted Securities
held by the Company or its Affiliates). Notwithstanding the foregoing, a waiver or consent to departure from the provisions hereof that relates exclusively to the rights of Holders whose securities are being tendered pursuant to an Exchange Offer
and that does not affect directly or indirectly the rights of other Holders whose securities are not being tendered pursuant to such Exchange Offer may be given by the Holders of a majority of the outstanding principal amount of Transfer Restricted
Securities being tendered or registered; provided, however, that, with respect to any matter that directly or indirectly affects the rights of any Initial Purchaser hereunder, the Company shall obtain the written consent of each such
Initial Purchaser with respect to which such amendment, qualification, supplement, waiver, consent or departure is to be effective. 
 (e) Notices. All notices and other communications provided for or permitted hereunder shall be made in writing by hand-delivery, first-class mail (registered or certified, return receipt
requested), telex, telecopier, or air courier guaranteeing overnight delivery: 
 (i) if to a Holder, at the
address set forth on the records of the Registrar under the applicable Indenture, with a copy to the Registrar under the applicable Indenture; and 
 (ii) if to the Company or the Guarantors: 
 Unit Corporation 

7130 South Lewis 
 Suite 1000 
 Tulsa, OK 74136 

Facsimile: (918) 493-7711 
 Attention: David Merrill, Chief Financial Officer and Treasurer, with a copy to Mark Schell, Senior Vice President, General Counsel and Secretary 

All such notices and communications shall be deemed to have been duly given: at the time delivered by hand, if personally delivered; five
Business Days after being deposited in the mail, postage prepaid, if mailed; when answered back, if telexed; when receipt acknowledged, if telecopied; and on the next Business Day, if timely delivered to an air courier guaranteeing overnight
delivery. 

  
 -20-

 Copies of all such notices, demands or other communications shall be concurrently delivered
by the Person giving the same to the Trustee or Existing Trustee at the address specified in the Indenture or Existing Indenture, as applicable. 
 (f) Successors and Assigns. This Agreement shall inure to the benefit of and be binding upon the successors and assigns of each of the parties, including, without limitation, and without the need
for an express assignment, subsequent Holders of Transfer Restricted Securities; provided, however, that this Agreement shall not inure to the benefit of or be binding upon a successor or assign of a Holder unless and to the extent such
successor or assign acquired Transfer Restricted Securities from such Holder. 
 (g) Counterparts. This Agreement may be
executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same agreement. 

(h) Headings. The headings in this Agreement are for convenience of reference only and shall not limit or otherwise affect the
meaning hereof. 
 (i) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF NEW YORK, WITHOUT REGARD TO THE CONFLICTS OF LAW RULES THEREOF. 
 (j) Severability. In the event that any
one or more of the provisions contained herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable, the validity, legality and enforceability of any such provision in every other respect and of the remaining
provisions contained herein shall not be affected or impaired thereby. 
 (k) Entire Agreement. This Agreement is
intended by the parties as a final expression of their agreement and intended to be a complete and exclusive statement of the agreement and understanding of the parties hereto in respect of the subject matter contained herein. There are no
restrictions, promises, warranties or undertakings, other than those set forth or referred to herein with respect to the registration rights granted by the Company with respect to the Transfer Restricted Securities. This Agreement supersedes all
prior agreements and understandings between the parties with respect to such subject matter. 

  
 -21-

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written
above. 
  

			
	UNIT CORPORATION
		
	By:	 	/s/ Mark E. Schell
		 	 Name: Mark E. Schell
 Title:
  Senior Vice President

  

			
	 THE “GUARANTORS”:
  

UNIT DRILLING COMPANY
UNIT PETROLEUM COMPANY
UNIT TEXAS COMPANY
UNIT DRILLING AND
EXPLORATION
      COMPANY
PETROLEUM SUPPLY COMPANY

		
	By:	 	/s/ Mark E. Schell
		 	 Name: Mark E. Schell
 Title:
  Senior Vice President

  

			
	UNIT DRILLING USA COLOMBIA, L.L.C.
UNIT DRILLING COLOMBIA, L.L.C.
UNIT TEXAS DRILLING, L.L.C.
PRESTON COUNTY GAS GATHERING, L.L.C.
SUPERIOR PIPELINE COMPANY,
L.L.C.
SUPERIOR PIPELINE TEXAS, L.L.C.
SUPERIOR APPALACHIAN PIPELINE, L.L.C.
		
	By:	 	/s/ Mark E. Schell
		 	 Name: Mark E. Schell
 Title:
  Manager

  
 -22-

 The foregoing Registration Rights Agreement is hereby confirmed and accepted as of the date
first above written: 
 MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED 

 

			
	By:	 	Merrill Lynch, Pierce, Fenner & Smith Incorporated
		
	By:	 	/s/ John Pantalena
		 	Director

  
 -23-

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