Document:

Amended and Restated Subordinated Promissory Note

 Exhibit 10.3 
 AMENDED AND RESTATED 
 SUBORDINATED PROMISSORY NOTE 
  

			
	$25,000,000.00	  	July 5, 2006

 FOR VALUE RECEIVED, the undersigned, Diamondback Energy Services LLC, a Delaware limited
liability company (the “Borrower”), with an address at 14301 Caliber Drive, Suite 200, Oklahoma City, Oklahoma 73134-1009, hereby promises and agrees to pay to the order of Kappa Investors LLC, a Delaware limited liability company,
with its main office located at c/o Wexford Capital LLC, 411 West Putnam Avenue, Greenwich, Connecticut 06830 (herein called the “Lender”) the principal sum of TWENTY-FIVE MILLION DOLLARS ($25,000,000), or so much thereof as may be
advanced and remain unpaid hereunder, in lawful money of the United States of America and in immediately available funds together with all accrued interest thereon computed and payable in the manner set forth below. The unpaid principal balance of,
and all accrued interest on, this Note, unless sooner paid, shall be due and payable in full on August 30, 2008 or on such earlier date as provided herein (the “Maturity Date”). 
 1. Payments. Interest shall be payable quarterly in arrears on the 15th day of each month commencing October 15, 2006 and on maturity. The interest rate applicable at any time to the outstanding balance of the Note is herein
referred to as the “Borrowing Rate”. From the date of this Note until Maturity Date, the outstanding principal balance of this Note, as the same shall exist from time to time, shall bear interest at the Borrowing Rate equal to LIBOR
plus four hundred basis points (LIBOR + 4%). All interest on this note shall be computed on the actual number of days elapsed over a three hundred sixty (360) day year. For purposes of this Note, LIBOR shall be the thirty (30) day
Libor rate, determined as of July 5, 2006 and on the 1st day of each month thereafter so long as the Note remains outstanding.

 2. Payments of principal and interest of this Note are to be made in lawful money of the United States of America at the
office of the Lender or at such other place as the Lender shall have designated by written notice to the Borrower. 
 If any installment of
interest or principal on this Note is not paid by the end of ten (10) calendar days after the date it is due, the Lender may, at any time thereafter, increase the interest rate applicable to the outstanding principal balance of this Note to a
rate which is two percent (2%) in excess of the Borrowing Rate specified above otherwise applicable to the principal of this Note (the “Default Rate”). The assessment or collection of Default Rate interest shall not constitute
a waiver of any default resulting from any failure to timely pay any payment due pursuant to this Note. In no event shall the applicable rate hereunder exceed the maximum rate of interest, if any, which may be collected from the undersigned under
applicable law. In the event that any payment received by the Lender shall be deemed in excess of the maximum legal rate of interest, then the dollar amount of any interest overpayment, over and above the maximum legal interest rate collectible by
the Lender, shall be credited against the outstanding principal balance hereof. The Default Rate shall apply retroactively to the first such Event of Default and shall continue until all such Events of Default have been cured. 

 3. Advances. The Lender agrees to make advances to the Borrower at any time and from time to time
after the date hereof up to Twenty-five Million Dollars ($25,000,000). Such periodic advances shall be made upon two (2) business days’ prior written request by the Borrower. Each advance shall bear interest from the date of the advance at
the rate prescribed in this Note and shall otherwise be subject to all terms and conditions expressed herein. Each borrowing shall be in minimum multiples of One Million Dollars ($1,000,000). All borrowings under and all payments made on account of
principal or interest on this Note shall be endorsed by Lender on the grid attached hereto as ANNEX I which is part of this Note and shall constitute prima facie evidence of the accuracy of the information endorsed. 
 4. Prepayment. The Borrower may prepay this Note, in whole or in part, at any time and from time to time without penalty. Each such prepayment
shall be accompanied by all accrued but unpaid interest to the date of prepayment. All payments shall be applied first to accrued and unpaid interest and then to principal. 
 5. Commitment Fee. The Borrower will pay the Lender a commitment fee equal to 1% of the principal amount of the loan (the “Commitment
Fee”). 
 6. Restrictions on Business; Indebtedness. Except as expressly permitted hereby, during the term of this Note,
without the Lender’s prior written consent, the Borrower will not, directly or indirectly: 
 (a) create, incur, assume, guarantee, or
agree to purchase or repurchase or provide funds in respect of, or otherwise become or be liable, with respect to, directly or indirectly, any indebtedness for borrowed money, contingent or otherwise, other than: (i) this Note, (ii) any
indebtedness existing as of the date hereof, and (iii) any purchase money indebtedness incurred in connection with the purchase of goods in the ordinary course of business to the vendor of such goods; provided that notwithstanding anything to
the contrary contained herein, the Borrower shall not be entitled to prepay any indebtedness for borrowed money prior to repayment of this Note without the prior written consent of the Lender; 
 (b) merge into or consolidate with any other corporation or sell, lease or otherwise dispose of all or any substantial part of its business or assets
(other than in the ordinary course of business); 
 (c) other than as permitted by Paragraph 6(a), (i) make any loans or advances,
purchase, otherwise acquire, invest in own any stock, obligation or other security of any corporation or other entity, or (ii) become or be obligated to provide funds to any corporation or other entity, or become or be liable, contingently or
otherwise (by guarantee, endorsement, discount, sale with recourse, repurchase agreement or otherwise) upon or with respect to, directly or indirectly, any indebtedness, liability, obligation, stock or dividend, of any other corporation or entity;

 (d) do, or authorize the taking of, any other action other than in the ordinary course of business consistent with past practice.

 7. Representations and Warranties of the Borrower. The Borrower hereby makes the following representations and warranties to the
Lender: 
  

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 (a) The Borrower is duly organized, validly existing and in good standing under the laws of its state of
organization, with all requisite power and authority to own, operate or lease its properties and to carry on its business as now being conducted. 
 (b) The execution, delivery and performance by the Borrower of this Note has been duly authorized by all necessary action and do not and will not (i) violate the terms or provisions of or result in a default under any terms, conditions
or provisions of (1) any judgment, injunction, decree, law, regulation or ruling of any court or of any governmental authority, domestic or foreign, or order to which the Borrower is subject, or (2) any material credit or other agreement
to which the Borrower is a party or any of its assets is or may be bound, or (ii) require the consent or approval of any person or entity, other than such consents or approvals as have been obtained. 
 (c) This Note constitutes a legal, valid and binding obligation of the Borrower, enforceable against the Borrower in accordance with its terms except to
the extent that such enforcement may be limited by applicable bankruptcy, insolvency and other similar laws affecting creditors' rights generally and by equitable principles. 
 8. Events of Default; Acceleration. The occurrence of any of the following events shall constitute an “Event of Default”:

 (a) if the Borrower shall default in the payment of principal on this Note when the same becomes due and payable, whether at maturity or by
acceleration or otherwise; or 
 (b) if the Borrower shall default in the payment of any interest on this Note when the same becomes due and
payable and such default shall continue more than ten (10) days or; 
 (c) if the Borrower shall default in the performance of or
compliance with any term contained in Paragraph 6 hereof and such default shall continue more than thirty (30) days after notice thereof; or 
 (d) if the Borrower shall default (as principal or guarantor, or other surety) in the payment of any principal, premium, if any, or interest on any obligation for borrowed money; or in the payment of any obligation for the deferred purchase
price of property, under a conditional sale or title retention agreement or for notes payable or drafts accepted representing extensions of credit; or in the performance of or compliance with any agreement, term, or conditions contained in any
evidence of any such obligation or of any mortgage, indenture, or other agreement relating thereto, and such default shall continue for more than the period of grace, if any, specified therein and shall not have been waived pursuant thereto; or

 (e) if any representation or warranty made by the Borrower in Paragraph 7 hereof shall have been false or misleading when made; or

 (f) if the Borrower shall (i) apply for or consent to the appointment of, or the taking of possession by, a receiver, custodian,
trustee or liquidator of such entity or person, of all or a substantial part of such entity or person’s property, (ii) make a general assignment for the 

  

 3 

 
benefit of such entity or person’s creditors, or (iii) commence a voluntary case under Title 11 of the United States Bankruptcy Code or any
successor thereto (the “Bankruptcy Code”), any state bankruptcy law or any law similar to any of the foregoing; or 
 (g) if
a proceeding or case shall be commenced against the Borrower without the application or consent of the Borrower in any court of competent jurisdiction, seeking (i) the liquidation, reorganization, dissolution, winding-up, or the composition or
readjustment of debts of the Borrower, or (ii) the appointment of a trustee, receiver, custodian, liquidator or the like for the Borrower under any law relating to bankruptcy, insolvency, reorganization, winding-up, or composition or adjustment
of debts, or a warrant of attachment, execution or similar process shall be issued against the property of the Borrower and such proceeding, case, warrant or process shall continue undismissed, or any order, judgment or decree approving or ordering
any of the foregoing shall be entered and continue unstayed and in effect, for a period of sixty (60) days or more days, or any order for relief against the Borrower shall be entered in an involuntary case under the Bankruptcy Code, any state
bankruptcy law or any law similar to any of the foregoing. 
 Upon and after the occurrence of an Event of Default, the entire unpaid
principal amount of this Note, and all accrued and unpaid interest thereon, shall, at the option of the Lender, become immediately due and payable without further notice. The foregoing shall not preclude any other Events of Default, or remedies
therefor, provided in any other documents between the Borrower and the Lender. The Borrower hereby expressly waives notice of the exercise of such acceleration option, presentment for payment, demand, protest and further notice of any kind. The
failure of Lender to exercise any of its rights and remedies shall not constitute a waiver of the right to exercise the same at that or any other time. All rights and remedies of Lender following an Event of Default hereunder or under any of the
instruments referred to herein shall be cumulative to the greatest extent permitted by law. Time shall be of the essence in the payment of all installments of interest and principal on this Note and the performance of the Borrower’s other
obligations hereunder. 
 The Borrower and endorser of this Note severally waive all notices, demands for payment, presentment for payment,
notice of dishonor, notice of protest, protest and diligence in collection as to this Note and as to each, every and all installments hereof, and agree that the granting to the Borrower, or any other party, of any extension or extensions of time for
the payment of any sum or sums due pursuant to this Note or for the performance of any covenant or condition thereof, or the taking or release of other or additional security, shall not in any way release or affect the liability of the Borrower or
endorser of this Note. 
 The Borrower shall have no right to set off any amounts owed under this Note against any amounts, if any, owed or
claimed to be owed now or in the future to the Borrower by Lender resulting from any claims, rights, damages, demands, causes of action or liabilities of any nature whatsoever, known or unknown, contingent or fixed, whether due or to become due,
that Borrower has had, now has or may have at any future time by reason of any cause, matter or thing. Borrower agrees that, as of the date of this Note, its obligations under this Note are not subject to any offsets or defenses against the Lender
of any kind. Borrower further agrees that its obligations under this Note shall not be subject to any counterclaims, offsets or defenses against the Lender of any kind which may arise in the future. 
  

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 9. General Provisions. 
 (a) No amendment of this Note or waiver of any provision hereunder shall be effective without the written consent of Lender. 
 (b) This Note shall be governed by, and construed in accordance with, the law of the State of New York without giving effect to the conflicts of law
principles thereof, and shall be binding upon and shall inure to the benefit of the parties hereto and their respective heirs, executors, personal or legal representatives and permitted assigns. 
 (c) THE UNDERSIGNED IRREVOCABLY AGREES THAT ALL ACTIONS OR PROCEEDINGS IN ANY WAY ARISING OUT OF OR RELATED TO THIS NOTE SHALL BE LITIGATED IN COURTS
HAVING SITUS WITHIN THE CITY OF NEW YORK, STATE OF NEW YORK. THE UNDERSIGNED HEREBY CONSENTS AND SUBMITS TO THE EXCLUSIVE JURISDICTION OF ANY STATE OR FEDERAL COURT LOCATED WITHIN SUCH CITY AND STATE AND WAIVES PERSONAL SERVICE OF ANY AND ALL
PROCESS UPON THE UNDERSIGNED AND AGREES THAT ALL SUCH SERVICE OF PROCESS MAY BE MADE BY CERTIFIED MAIL DIRECTED TO THE UNDERSIGNED AT THE LAST KNOWN ADDRESS OF THE UNDERSIGNED AS SHOWN IN THE RECORDS OF THE LENDER OR IN ANY OTHER MANNER PERMITTED BY
LAW. 
 THE UNDERSIGNED IRREVOCABLY WAIVES ANY RIGHT TO TRIAL BY JURY IN ANY ACTION OR PROCEEDING IN ANY WAY ARISING OUT OF OR RELATED TO
THIS NOTE. 
 (d) Any notice required to be given by this Note shall be in writing, and shall be delivered either; (i) by hand,
(ii) by a certified United States mail, return receipt requested, or (iii) by a commercial delivery service guaranteeing overnight delivery, in any event with postage and delivery charges prepaid. Such notice shall be deemed to have been
duly given on receipt if delivered by hand or by overnight carrier, or three business days after the date of deposit in an official depository of the United States mails if mailed. All notices shall be mailed or delivered, as aforesaid, addressed to
the parties at their respective addresses set forth above. Each party may change the address or addresses to which notice is to be delivered to it by notifying the other party of the new address or addresses in the manner provided herein for the
giving of notices and such change of address shall be effective five (5) business days after such notice is given. 
 SIGNED AND
DELIVERED as of the day and year first herein above set forth. 
  

			
	DIAMONDBACK ENERGY SERVICES LLC
		
	 By:
	 	 /s/ Paul Jacobi

		 	 Name: Paul Jacobi

		 	 Title: Vice President

  

 5First Amendment to Amended and Restated Credit Agreement

 Exhibit 10.19 
 FIRST AMENDMENT TO 
 AMENDED AND RESTATED CREDIT AGREEMENT 
 This First Amendment (this “Amendment”) dated as of May 10, 2007 (the “Effective Date”), is by and among
Diamondback Holdings, LLC, a Delaware limited liability company (“Holdings”), Diamondback Energy Services, Inc., a Delaware corporation (the “Merger Sub”), certain subsidiaries thereof (the
“Guarantors”), the lenders party to the Credit Agreement referred to below (the “Lenders”), and Fortis Capital Corp., as administrative agent for the Lenders (in such capacity, the “Administrative
Agent”) and as issuing bank (in such capacity, the “Issuing Bank”). 
 WHEREAS, Holdings, Merger Sub, the
Guarantors, the Lenders, and the Administrative Agent are parties to the Amended and Restated Credit Agreement dated as of February 13, 2007 (the “Credit Agreement”); and 
 WHEREAS, the Borrower has requested and the Lenders have agreed (a) to increase the aggregate Revolving Commitments to $105,000,000.00 and
(b) to make certain other amendments to the Credit Agreement as provided for herein. 
 NOW THEREFORE, in consideration of the premises
and the mutual covenants, representations and warranties contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 
 AGREEMENT 
 Section 1. Defined
Terms. Unless otherwise defined in this Amendment, each capitalized term used in this Amendment has the meaning given such term in the Credit Agreement. 
 Section 2. Amendments to the Credit Agreement. 
 (a) The definition of “Revolving
Commitment” in Section 1.01 of the Credit Agreement is hereby amended by deleting the following sentence: “The initial aggregate amount of the Revolving Commitments is $80,000,000.” 
 (b) Section 5.08 of the Credit Agreement is hereby amended by replacing “and (c)” with “(c)” and inserting the
following after “in which case the Loan Parties shall be responsible for all such expenses”: 
 “; and (d) one
(1) time during each fiscal quarter of the Borrower at the discretion of the Administrative Agent, during regular business hours upon reasonable prior notice, permit representatives and independent contractors of the Administrative Agent to
conduct an audit of the Collateral included in the Borrowing Base and of the accounting systems of the Loan Parties of a scope reasonably satisfactory to the Administrative Agent, all at the expense of the Borrower.” 
  

 (c) Section 6.12 of the Credit Agreement is hereby replaced in its entirety with the
following: 
 Section 6.12 Operating Leases. Enter into or remain liable upon any Operating Lease except for
Operating Leases in the aggregate for the Borrower and its Subsidiaries not to exceed $5,000,000 in aggregate payments for each fiscal year. 
 (d) Schedule 2.01 to the Credit Agreement is hereby replaced in its entirety with Schedule 2.01 attached hereto. 
 (e) Schedule 6.12 to the Credit Agreement is hereby deleted in its entirety. 
 Section 3. Increase of the Revolving
Commitments. As of the Effective Date, the aggregate Revolving Commitments shall be increased from $80,000,000 to $105,000,000. Upon the effectiveness of this Amendment pursuant to Section 4 below, each Lender’s Revolving Commitment
shall be the Revolving Commitment set forth on the attached Schedule 2.01. The Commitment Fees provided for in Section 2.03(a) of the Credit Agreement shall hereafter be computed on the basis of the Revolving Commitments, as so
increased. 
 Section 4. Conditions to Effectiveness. The Credit Agreement shall be amended as provided in this Amendment on the date
first set forth above when: 
 (a) the Administrative Agent shall have received this Amendment duly executed by the Borrower, each Guarantor,
each Lender, the Issuing Bank and the Administrative Agent; 
 (b) the Administrative Agent shall have received each Note requested by a
Lender pursuant to Section 2.02(g) of the Credit Agreement payable to the order of such requesting Lender in the amount of its Revolving Commitment after giving effect to this Amendment; 
 (c) the Administrative Agent shall have received a certificate of a Responsible Officer of each Loan Party dated as of the date hereof and certifying
(A) such Loan Party’s organizational documents or that there have been no changes to the organizational documents of such Loan Party since such organizational documents were last certified to the Administrative Agent and the Lenders or
attaching such amendments and (B) that attached thereto is a true and complete copy of resolutions duly adopted by the Board of Directors of such Loan Party authorizing the execution, delivery and performance of this Amendment, the Credit
Agreement as amended hereby and the other Loan Documents to which such Loan Party is a party and, in the case of the Borrower, the borrowings under the Credit Agreement, as amended hereby, and that such resolutions have not been modified, rescinded
or amended and are in full force and effect; 
 (d) the Administrative Agent shall have received a favorable opinion dated as of the date
hereof of Steve Gelnar, general counsel to the Loan Parties; 
  

 2 

 (e) the Administrative Agent shall have received a favorable opinion dated as of the date hereof of Akin
Gump Strauss Hauer & Feld LLP, Texas, New York and Delaware counsel to the Loan Parties; 
 (f) the Administrative Agent shall have
received a favorable opinion dated as of the date hereof of Kean Miller Hawthorne D’Armond McCowan & Jarman L.L.P., Louisiana counsel to the Loan Parties; and 
 (g) the Administrative Agent shall have received such other documents, governmental certificates and agreements as the Administrative Agent or any Lender
may reasonably request. 
 Section 5. Representations and Warranties. The Borrower hereby represents and warrants that after giving
effect hereto: 
 (a) the representations and warranties of the Loan Parties contained in the Loan Documents are true and correct in all
material respects on and as of the Effective Date, other than those representations and warranties that expressly relate solely to a specific earlier date, which shall remain correct as of such earlier date; and 
 (b) no Default or Event of Default has occurred and is continuing. 
 Section 6. Reaffirmation of Guaranty. Each Guarantor hereby ratifies, confirms, and acknowledges that its obligations under the Credit Agreement are in full force and effect and that each Guarantor continues to
unconditionally and irrevocably, jointly and severally, guarantee the full and punctual payment, when due, whether at stated maturity or earlier by acceleration or otherwise, all of the Obligations (subject to the terms of Article VIII of the Credit
Agreement), as such Obligations may have been amended by this Amendment. Each Guarantor hereby acknowledges that its execution and delivery of this Amendment does not indicate or establish an approval or consent requirement by the Guarantors in
connection with the execution and delivery of amendments to the Credit Agreement or any of the other Loan Documents. 
 Section 7.
Governing Law. THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND THE APPLICABLE LAWS OF THE UNITED STATES OF AMERICA. 
 Section 8. Counterparts. This Amendment may be executed in any number of counterparts and by different 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. Transmission by facsimile of an executed counterpart of this Amendment shall be deemed to constitute due and sufficient delivery of such counterpart. 
 Section 9. ENTIRE AGREEMENT. THIS AMENDMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. 
  

 3 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and delivered by
their respective duly authorized officers as of the Effective Date. 
  

			
	 HOLDINGS:
  
 DIAMONDBACK HOLDINGS, LLC

		
	By:	 	 /s/ Cale M. Coulter

	Name:	 	 Cale M. Coulter

	Title:	 	 CFO

	
	 MERGER SUB:
  
 DIAMONDBACK ENERGY SERVICES, INC.

		
	By:	 	 /s/ Cale M. Coulter

	Name:	 	 Cale M. Coulter

	Title:	 	 CFO

	
	 GUARANTORS:
  
 DIAMONDBACK-COMPLETIONS LLC
 DIAMONDBACK-QUANTUM LLC
 DIAMONDBACK PUMPING SERVICE LLC
 DIAMONDBACK-PIONEER LLC
 DIAMONDBACK-PST LLC
 DIAMONDBACK-WELL SERVICE LLC
 DIAMONDBACK-RHINO LLC
 DIAMONDBACK-TOTAL SERVICES LLC
 DIAMONDBACK-CEMENTING SERVICES LLC
 PACKERS & SERVICE TOOLS, INC.
 SOONER TRUCKING & OILFIELD SERVICES, INC.
 DIAMONDBACK-DISPOSAL LLC
 DIAMONDBACK-TOTAL OKLAHOMA LLC
 DIAMONDBACK-TD WEST, LLC

		
	By:	 	 /s/ Cale M. Coulter

	Name:	 	 Cale M. Coulter

	Title:	 	 CFO

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	
	DIAMONDBACK PUMPING SERVICE, L.P.
		
	By:	 	 Diamondback Pumping GP, LLC
 its general partner

		
	By:	 	 /s/ Cale M. Coulter

	Name:	 	 Cale M. Coulter

	Title:	 	 CFO

	
	DIAMONDBACK-TOTAL, L.P.
		
	By:	 	 Diamondback-Total Texas LLC,
 its general partner

		
	By:	 	 /s/ Cale M. Coulter

	Name:	 	 Cale M. Coulter

	Title:	 	 CFO

	
	DIAMONDBACK-TOTAL PUMPING, L.P.
		
	By:	 	 Diamondback-Total Pumping GP LLC,
 its general partner

		
	By:	 	 /s/ Cale M. Coulter

	Name:	 	 Cale M. Coulter

	Title:	 	 CFO

	
	DIAMONDBACK-DISPOSAL, L.P.
		
	By:	 	 Diamondback-Disposal Texas LLC,
 its general partner

		
	By:	 	 /s/ Cale M. Coulter

	Name:	 	 Cale M. Coulter

	Title:	 	 CFO

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	 ADMINISTRATIVE AGENT:
  
 FORTIS CAPITAL CORP.,
 as Administrative Agent and Issuing Bank

		
	By:	 	 /s/ Svein Engh

	Name:	 	 Svein Engh

	Title:	 	 Managing Director

		
	By:	 	 /s/ Joseph Maxwell

	Name:	 	 Joseph Maxwell

	Title:	 	 Senior Vice President

	
	 LENDERS:
  

FORTIS CAPITAL CORP.

		
	By:	 	 /s/ Svein Engh

	Name:	 	 Svein Engh

	Title:	 	 Managing Director

		
	By:	 	 /s/ Joseph Maxwell

	Name:	 	 Joseph Maxwell

	Title:	 	 Senior Vice President

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	
	 WELLS FARGO BANK, N.A.

		
	By:	 	 /s/ Michael Janak

	Name:	 	 Michael Janak

	Title:	 	 Vice President

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	
	 NATIXIS

		
	By:	 	 /s/ Donovan C. Broussard

	Name:	 	 Donovan C. Broussard

	Title:	 	 Managing Director

		
	By:	 	 /s/ Louis P. Laville, III

	Name:	 	 Louis P. Laville, III

	Title:	 	 Managing Director

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	
	 JPMORGAN CHASE BANK, N.A.

		
	By:	 	 /s/ William C. Scheihing, Jr.

	Name:	 	 William C. Scheihing, Jr.

	Title:	 	 SVP

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	
	 AMEGY BANK NATIONAL ASSOCIATION

		
	By:	 	 /s/ Scott Collins

	Name:	 	 Scott Collins

	Title:	 	 Vice President

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	
	 MIDFIRST BANK

		
	By:	 	 /s/ James P. Boggs

	Name:	 	 James P. Boggs

	Title:	 	 Senior Vice President

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

			
	
	 COPPERMARK BANK

		
	By:	 	 /s/ Robert P. Holmes

	Name:	 	 Robert P. Holmes

	Title:	 	 Sr. V.P.

  

 Signature Page to First Amendment to 
 Amended and Restated Credit Agreement 
 Diamondback Holdings, LLC and Diamondback Energy
Services, Inc. 

 SCHEDULE 2.01 
 Revolving Commitments and Pro Rata Shares of the Lenders 
  

					
	 Lender
	  	 Revolving Commitment
	  	 Pro Rata Share

	 Fortis Capital Corp.
	  	$18,375,000.00	  	17.50%
	 Wells Fargo Bank, N.A.
	  	$18,375,000.00	  	17.5%
	 Natixis
	  	$18,375,000.00	  	17.5%
	 JPMorgan Chase Bank, N.A.
	  	$17,062,500.00	  	16.25%
	 Amegy Bank N.A.
	  	$17,062,500.00	  	16.25%
	 Midfirst Bank
	  	$7,875,000.00	  	7.5%
	 Coppermark Bank
	  	$7,875,000.00	  	7.5%
		  	 	  	 
			
	 TOTAL:
	  	$105,000,000.00	  	100%

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