Document:

Assignment and Assumption of and Amended and Restated Employment Agreement

 EXHIBIT 10.19 
 ASSIGNMENT AND ASSUMPTION OF AND AMENDED AND RESTATED 

EMPLOYMENT AGREEMENT 
 This Assignment and Assumption of and Amended and Restated Employment Agreement (this “Agreement”), is entered into as of the 16th day of May, 2011 (“Effective Date”), by
and among GREAT WHITE ENERGY SERVICES LLC, a Delaware limited liability company (“GWES”), GW HOLDINGS I LLC, a Delaware limited liability company (the “Company”), and RANDALL HOLDER (“Employee”).

 WITNESSETH: 
 WHEREAS, GWES and the Employee entered into that certain Employment Agreement dated as of August 20, 2010 (the “Original Employment Agreement”). 

WHEREAS, GWES desires to assign to the Company, all right, title and interest of GWES in and to the Original Employment Agreement, and
the Company desires to assume all of the obligations of GWES under the Original Employment Agreement. 
 WHEREAS, the Company
and the Employee desire to amend and restate the Original Employment Agreement pursuant to the terms of this Agreement. 
 NOW,
THEREFORE, in consideration of the promises and mutual agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereby agree as follows: 

ASSIGNMENT AND ASSUMPTION 
 1. Assignment of Original Employment Agreement. As of the Effective Date, GWES does hereby assign, transfer, set over and deliver unto the Company all of the right, title and interest
of GWES in and to the Original Employment Agreement, but subject to all of the terms, conditions, reservations and limitations set forth in the Original Employment Agreement. 
 2. Assumption of Original Employment Agreement. From and after the Effective Date, the Company does hereby expressly assume and agree to be liable for and to pay and perform all of
the terms, conditions, liabilities and obligations of GWES under the Original Employment Agreement. 
 AMENDMENT AND
RESTATEMENT 
 The Company and Employee hereby amend and restate the Original Employment Agreement as follows:

 1. Purpose of Agreement. Company and Employee wish to enter into or continue an at-will employment relationship. Furthermore,
the parties recognize the importance to Company of obtaining Employee’s loyalty and protecting Company’s rights with respect to its intellectual property, customers, business information and trade secrets. In consideration of the
employment, and/or of the continuation thereof, of the Employee by Company as of the Effective Date, the 

  
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payment of compensation and benefits to Employee during such employment, and Employee being given access to Company’s confidential information, Employee and Company agree as follows:

 2. Compensation and Benefits. 
 2.1 The base salary for Employee shall be at the monthly base rate of pay in the amount of Seventeen Thousand Five Hundred and No/100 Dollars ($17,500) (the “Base Salary”). Base
Salary shall be payable in accordance with the Company’s general payroll practices and shall be subject to customary withholding for applicable taxes, benefits and other standard withholding policies. Base Salary may be adjusted during the
employment period in the sole and absolute discretion of the Manager or the Board of Directors of the Company (the “Board”). Except as provided in Article 13 below, upon termination of employment Employee shall be entitled to
receive any Base Salary earned but unpaid through the date of such termination, and no other monies or benefits shall be payable or owed to Employee under this Agreement. 
 2.2 On or before May 20, 2011, Employee shall be paid a one-time discretionary bonus in the amount of Two Hundred Ten Thousand and No/100 Dollars ($210,000) (the “Discretionary
Bonus”). 
 2.3 In addition to the Discretionary Bonus, the Employee shall be eligible to receive an annual
bonus in accordance with the Company’s bonus policy to be established by the Board from time to time (the “Annual Bonus”). The Annual Bonus shall be determined by the Board based upon Employee’s achievement of performance
goals as determined by the Board for each calendar year of the Company; provided, however, that the target amount of the Annual Bonus shall be fifty percent (50%) of the Base Salary received during the applicable calendar year. 

2.4 The Company will provide Employee with an apartment for a period of six (6) months commencing on the Effective Date.

 2.5 Pursuant to the terms of such plans, as may be amended from time to time, Employee may participate during his
employment in employee benefit plans in which the Company is the plan sponsor or a participating employer and in which Employee qualifies to participate. Such plans may provide medical, dental, vacation, disability and other benefits. 

3. Duties. Employee will perform his duties faithfully and to the best of his ability and shall devote his full business efforts and time
to performing such duties. Employee (i) shall not (without the prior written consent of the Board) engage in any business activities other than the performance of his duties under this Agreement, (ii) shall devote his full-time business
efforts and attention to the performance of such duties, and (iii) must neither engage in any other employment, occupation or consulting activity for any direct or indirect remuneration nor engage in any other activities that conflict with the
business interests of the Company, Wexford Capital LP (“Wexford”) or any of the subsidiaries, affiliates or other related entities of the foregoing (collectively “Related Entities”) or impede his performance of such
duties. 
 4. Intellectual Property. 

  
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 4.1 As part of Employee’s duties in connection with the business of Company,
Employee, while employed by Company, has participated or may participate in conceiving, discussing or making new developments, ideas, products, inventions, improvements or works of authorship (whether or not patentable and whether or not
copyrightable). All such concepts, developments, ideas, products, inventions, improvements, works of authorship and related rights (whether or not patentable and whether or not copyrightable) are referred to herein as “Intellectual
Property”. Solely for the consideration noted herein, and specifically for no further consideration or compensation, Employee agrees that all Intellectual Property conceived of, developed by or worked on by Employee, either alone or with
others, shall be the sole and exclusive property of Company if such Intellectual Property, in whole or in part, is conceived, developed, recorded, disclosed, worked on or authored: 

(a) during Employee’s employment by Company before or after the Effective Date; 

(b) after termination of Employee’s employment, if any such Intellectual Property was conceived of, disclosed or
resulted from work done by Employee during Employee’s employment with Company; or 
 (c) after termination
of Employee’s employment, if any such Intellectual Property resulted from, is based on, derived from or uses any Confidential Information (as that term is defined herein). 

4.2 Employee shall disclose in writing promptly to the Board or the Board’s designee all Intellectual Property referred to in
Section 4.1 above. In addition, when requested to do so, whether during Employee’s employment or after termination thereof, Employee shall, without further consideration or compensation of any kind, assign and convey to Company the entire
right, title and interest in and to the Intellectual Property; and sign and deliver all oaths, applications and assignments for the Intellectual Property. 
 4.3 Any written, electronic or digital records of work performed in connection with the Intellectual Property, whether kept or created by Employee or others, shall be the exclusive property of
Company. 
 4.4 Employee warrants and represents that Employee will not disclose to Company any information or
intellectual or other property owned by a third party, and known by Employee to be confidential, in the absence of a properly executed confidentiality or non-disclosure agreement between Company and such third party. 

5. Confidential Information. 
 5.1 Definition and Treatment of Confidential Information. Employee acknowledges that, in and as a result of his employment by the Company, Employee will have access to, use or be privy to
confidential information of a special and unique nature and value, including, without limitation, the Company’s, Wexford’s and Related Entities’ trade secrets, bid prices, contractual terms (prospective or otherwise), marketing plans,
operating and financial information, results and forecasts, systems, business decisions, plans, procedures, strategies and policies, legal matters, manuals, guides, personnel, confidential reports and communications,

  
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lists and contact information of customers, and Intellectual Property (collectively, the “Confidential Information”). Employee acknowledges and agrees that any information and
materials received from, acquired by or on behalf of the Company or any other party in confidence (or subject to nondisclosure covenants) or prepared, designed or created for the benefit of the Company shall be deemed to be and shall be included in
the definition of Confidential Information. Employee acknowledges and agrees the Confidential Information is and shall remain the sole and exclusive property of the Company. Employee shall not, except with the prior written consent of the Company,
as applicable, or except if Employee is acting as an employee of the Company solely for the benefit of the Company in connection with the Company’s business and in accordance with the Company’s business practices and employee policies, at
any time during or following the term of his employment with the Company, directly or indirectly, use, divulge, reveal, report, publish, transfer or disclose, for any purposes whatsoever, any Confidential Information. 

5.2 Former Employer Information. At any time during and after the period of employment the Employee shall not improperly
use or disclose any proprietary information or trade secrets of any former employer or other person or entity and that the Employee shall not bring onto the premises of the Company, Wexford or any of the Related Entities any unpublished document or
proprietary information belonging to any such employer, person or entity unless consented to in writing by such employer, person or entity. 
 5.3 Third Party Information. The Company, Wexford and the Related Entities have received and in the future will receive from third parties their confidential or proprietary information
subject to a duty on the Company’s, Wexford’s and/or the Related Entities’ part to maintain the confidentiality of such information and to use it only for certain limited purposes. The Employee shall hold all such confidential or
proprietary information in the strictest confidence and shall not disclose it to any person, firm or corporation or to use it except as necessary in carrying out the Employee’s work for the Company, Wexford or any of the Related Entities, as
applicable, consistent with such party’s agreement with such third party. 
 6. Non-Solicitation. Employee hereby
acknowledges that the following provisions of this Agreement are reasonable and necessary for the protection of the Company: 

6.1 No Solicitation of Customers. During the period of employment and for a period of twelve (12) months after
Employee ceases to be employed with the Company, regardless of the reason for Employee’s termination, Employee agrees he will not, on Employee’s own behalf, or on behalf of any other individual, sole proprietorship, business, firm,
partnership, company, corporation or other entity other than the Company, directly solicit, or ask anyone else to solicit, the sale of goods, services or a combination of goods and services, which are the same or similar to those provided by the
Company, Wexford or any of the Related Entities, from Established Customers. Employee further agrees that for the same period, he will not in any way interfere or attempt to interfere with the Company’s, Wexford’s or any of the Related
Entities’ relationships with any of their Established Customers. “Established Customers” means a customer that the Company, Wexford or any of the Related Entities has actually done business with during the twelve (12) months
preceding the date Employee ceases to be employed by the Company. Employee acknowledges that the Company, Wexford and the Related Entities solicit and sell services or products to entities located throughout the world. 

  
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 6.2 No Solicitation of Employees. During the period of employment and for a
period of twelve (12) months after Employee ceases to be employed with the Company, regardless of the reason for Employee’s termination, Employee agrees to not, directly or indirectly, solicit for employment, induce the employment
termination of or employ any of the Company’s, Wexford’s or any of the Related Entities’ employees on Employee’s own behalf or on behalf of any other individual or entity in competition with the Company, Wexford or any of the
Related Entities. 
 6.3 No Solicitation of Suppliers or Other Persons. During the period of employment, and for a
period of twelve (12) months after Employee ceases to be employed with the Company, regardless of the reason for Employee’s termination, Employee agrees to not, directly or indirectly, solicit, induce or attempt to induce any supplier,
lessor, licensor, or other person who has a business relationship with the Company, Wexford or any of the Related Entities, or who on the date Employee’s employment hereunder is terminated is engaged in discussions or negotiations to enter into
a business relationship with the Company, Wexford or any of the related Entities, to discontinue or reduce the extent of such relationship with the Company, Wexford or any of the Related Entities. 

6.4 Reformation. Employee understands that the geographic area applicable to Sections 6.1, 6.2 and 6.3
extends worldwide and, based on the nature of the products and services provided by the Company, Wexford and Related Entities and the broad distribution of their customers, the limitation set forth in this Article 6 is reasonable in geographic area
and time. However, if any court shall determine that the time, geographic area or scope of activity of any restriction contained in this Article 6 is unenforceable, it is the intention of Employee and the Company that such limitation set forth
herein shall not be terminated but shall be amended to the extent required to render it valid and enforceable. A court hearing any such dispute is empowered and authorized by the parties to reform this Agreement to the maximum time, scope or
geographic limitations permitted by applicable law. 
 7. Remedies for Breach of Agreement. Employee expressly acknowledges and
the parties to this Agreement recognize that the restrictions contained herein are reasonable and necessary to protect the business and interests of Company, and that any violation of these restrictions will cause substantial irreparable injury and
damage to Company and the extent of such damage would be difficult if not impossible to calculate. Accordingly, the parties to this Agreement expressly agree that (a) if Employee breaches any provision of this Agreement, the damage to Company
may be substantial, although difficult to ascertain, and monetary damages may not afford an adequate remedy, and (b) if Employee is in breach of any provision of this Agreement, or threatens a breach of this Agreement, Company shall be
entitled, in addition to all other rights and remedies as may be provided by law, to seek specific performance and injunctive and other equitable relief, including, but not limited to, restraining orders and preliminary and permanent injunctions, to
enforce the provisions of this Agreement, particularly those provisions governing non-solicitation and confidentiality, contained in this Agreement, as well as to prevent or restrain a breach of any provisions of this Agreement. The parties
expressly agree that Company has these specific and express rights to injunctive relief without posting any bond that might be requested or required, and without the necessity of proving irreparable injury, and that Employee expressly agrees not to
claim in any such equitable proceedings that a remedy at law is available to Company. The existence of any claim or cause of action by Employee, 

  
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whether predicated on this Agreement or otherwise, shall not constitute a defense to the enforcement by Company of any provision hereof. The parties to this Agreement also expressly agree that
Company is entitled to recover any and all damages for any losses sustained, and rights of which it has been deprived, as well as any damages allowed by law. Although Employee recognizes that the foregoing limitations and scope of this Agreement are
reasonable and properly required for the adequate protection of the business of Company, in the event any such time limitation or scope of activities covered is found to be unenforceable by a court of competent jurisdiction, then Employee and
Employer agree to such reduction of the limitation as shall appear reasonable to the court. 
 8. At-Will Employment
Status. This Agreement does not in any way alter the fact that Employee’s employment with the Company is at-will, meaning Employee has the right at any time, and for any or no reason, to terminate his employment with or without
notice, and that the Company has the same right. Employee is and shall remain an “at-will” employee of Company in all respects. 

9. Compliance. As an employee of the Company, Employee agrees that he shall comply with and be bound by any employee handbook and/or
compliance policies and procedures generally applicable to the employees of the Company as may be adopted and/or amended from time to time (collectively the “Compliance Documents”); provided that this Agreement shall govern with
respect to the subject matter herein in the event of any conflict with the provisions of the Compliance Documents except to the extent that any such conflicting provision in the Compliance Documents is adopted by the Company in its discretion to
comply with any law, regulation or other requirement to which it is subject. Employee agrees that he or she shall promptly provide such other certifications or disclosures as may be reasonably required by the Company in connection with the
Compliance Documents. 
 10. Background Verification. Employee hereby authorizes the Company to conduct one or more
Background Verifications prior to and during his actual employment. “Background Verification” includes, without limitation, information regarding Employee’s employment and other experience, educational background and any
criminal, credit or regulatory history. Employee further authorizes, without reservation, any lawful enforcement agency, administrator, court, governmental body, federal or provincial agency, institution, school or university (public or private),
information service bureau, employer or insurance company contacted by the Company or any agent of the Company to furnish the information set forth in the preceding sentence as part of the pre-employment application process. Employee hereby consents
to and understands that the Company will only use the information collected for the purposes of (if and as applicable) establishing or continuing Employee’s employment, including without limitation, evaluating Employee’s employment
application, determining employment eligibility under the Company’s employment policies, assessing property and business risks to the Company, and otherwise as may be permitted or required by law. Employee authorizes and consents to the release
of records obtained through such checks to the authorized representatives of the Company or its agents, and to the Company’s affiliates, for the purposes described above. Employee acknowledges and agrees that any information relating to a
Background Verification may be shared with the Company and stored on its servers. 

  
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 11. Non-Disparagement. Employee shall not, directly or indirectly, disparage,
denigrate or make negative comments about the Company, Wexford or the Related Entities to customers, potential customers, vendors or other third parties during or after the term of this Agreement. Nothing in this Article 11 shall be interpreted to
preclude Employee from communicating with any governmental agency or other entities as allowed by law. 
 12. Other Agreements. 

 12.1 Employee represents that his employment with Company and compliance with and performance of all the terms of this
Agreement as an employee of Company does not and will not breach or conflict with any other agreement entered into by Employee, or to which Employee may be subject, during or prior to Employee’s employment by Company. 

12.2 Employee acknowledges and agrees that the Key Employee Retention Bonus Agreement effective May 17, 2010 between Employee
and GWES is of no further force and effect because an “Event” as defined therein did not occur on or before May 1, 2010. Accordingly, Employee is not entitled to any payment thereunder. 

13. Salary Continuation. 
 13.1 In the event Company terminates Employee’s employment during the twenty-four (24) months immediately following the Effective Date, Employee will be entitled to receive monthly
payments of Employee’s Base Salary in effect on the date of Employee’s termination through the period of six (6) months after Employee ceases to be employed by the Company, conditioned upon Employee’s execution of a general
release in a form provided by the Company. Such payments shall be made in regular installments in accordance with the Company’s general payroll practices, subject to customary withholding for applicable taxes, insurance and other withholding
agreements. Employee agrees that no other monies or benefits (that are not identified or specified herein) shall be payable or owed to Employee under this Agreement for termination by the Company. Notwithstanding the above, if Employee’s
termination of employment is for “cause,” as defined herein, the Company will not be obligated to make the salary continuation payments provided for in this Section 13.1. 

13.2 Nothing in this Article 13 should be construed as a waiver of the limitations and obligations set forth in Sections 6.1, 6.2
and 6.3 above and, regardless of whether Employee is entitled to salary continuation following termination of his or her employment, Employee will be limited by the provisions set forth in Sections 6.1, 6.2 and 6.3 above. 

13.3 The Company has sole discretion to determine if “cause” exists to terminate the employment relationship. For
purposes of this Agreement, “cause” shall mean any of the following: (a) the breach by Employee of his duties as an employee of the Company, which breach is detrimental to the Company, monetarily or otherwise, (b) the
failure of Employee to comply in any material respect with any written or oral direction of the Company which reasonably relates to the performance of his duties that would not require him to perform an illegal act or breach any agreement to which
the Company is a party, (c) the failure of Employee to substantially perform his duties as an employee, (d) the conviction of Employee of, or plea of nolo contendere to, any criminal act that constitutes a felony or involves, fraud,
dishonesty, or 

  
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moral turpitude, (e) the commission of any act of fraud or dishonesty in the performance of his duties for or on behalf of the Company, any subsidiary of the Company or other related entity,
(f) the inability or failure of Employee to devote his full business time and attention to his duties under this Agreement, (g) unsatisfactory results of any Background Verification, (h) the taking by Employee of any action, knowing
or with reckless disregard, that it is adverse in a material respect to the interests of the Company, its members, or its assets, (i) the material violation by Employee of any employer policies of the Company, and (j) the material breach
by Employee of any of his covenants and agreements contained in this Agreement. 
 14. Miscellaneous. 

14.1 Notices. Any notice provided for in this Agreement shall be in writing and shall be either personally
delivered, mailed electronically or by first class mail, return receipt requested, to the recipients at the addresses indicated below: 
  

			
	To Employee:	  	At the address of Employee reflected in the
		  	employment records of the Company.
		
	To Company:	  	GW Holdings I LLC
		  	Attention: General Counsel
		  	14201 Caliber Drive, Suite 300
		  	Oklahoma City, Oklahoma 73134
		  	E-Mail: generalcounsel@greatwhiteenergy.com

 or such other
addresses or to the attention of such other person as the recipient party shall have specified by prior written notice to the sending party. Any notice under this Agreement shall be deemed to have been given when so delivered or mailed. 

14.2 Integration. This Agreement embodies the entire agreement and understanding among the parties relative to the subject
matter herein, and supersedes any prior agreements and understandings relating to such subject matter, including the Retention Agreement which is hereby superseded and is of no further force or effect. 

14.3 Applicable Law. This Agreement shall be governed by and construed in accordance with the laws of the State of Oklahoma
(regardless of the laws that might otherwise govern under applicable principles of conflicts of law) as to all matters, including but not limited to matters of validity, construction, effect, performance and remedies. 

14.4 No Waiver. Failure by the Company to enforce any provision of this Agreement shall not constitute a waiver of any term
hereof. The waiver by Company of, or any failure to enforce, a breach of any provision of this Agreement by Employee or any other employee of Company shall not operate or be construed as a waiver of any subsequent breach by Employee or, if such
waiver or failure to enforce relates to any other employee of Company, be deemed to allow Employee to take any similar action. 

14.5 Future Modifications. This Agreement cannot be modified or amended except by a written instrument signed by the
parties. 

  
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 14.6 Prevailing Party. In the event either party commences an action
or proceeding alleging any violations of this Agreement, or seeking to enforce, construe, modify or interpret this Agreement, the non-prevailing party shall pay all costs, expenses and reasonable attorneys’ fees incurred by the prevailing party
in connection with such action or proceeding. 
 14.7 Severability/Reformation Of Agreement. The provisions
of this Agreement shall be deemed severable, and the invalidity or unenforceability of any one or more of the provisions hereof shall not affect the validity or enforceability of any one or more of the other provisions hereof. In the event any
provision or clause is found to be in conflict with a mandatory provision of applicable law, the parties agree the conflicting provision shall be modified to conform. The parties hereto covenant and agree that should any provision of this Agreement,
under any circumstances, foreseen or unforeseen, including without limitation, term periods and geographic areas, be deemed too broad for the intended purposes, such provisions shall, nevertheless, be valid and enforceable to the extent necessary
for the protection of Company and such provision shall be construed by limiting and reducing it so as to be enforceable to the extent compatible with the applicable law in such jurisdictions as it shall then appear. 

14.8 Successors and Assigns. This Agreement is for the benefit of and will be binding upon each of the parties hereto and
their respective assignees, successors, assigns, heirs, executors, administrators and legal representatives; provided, however, Employee may not assign any of his rights or obligations hereunder without the prior written consent of Company. This
Agreement and the terms hereof shall survive the termination of Employee’s employment with Company and the assignment of this Agreement by Company to any assignee or other successor-in-interest. The term “Company” herein shall include
Company and all of its domestic and foreign affiliates, including other companies controlled by Company, controlling Company or under common control with Company. 
 [SIGNATURES ON FOLLOWING PAGE] 

  
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 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the Effective
Date. 
  

					
	GWES:
	
	GREAT WHITE ENERGY SERVICES LLC, a Delaware limited liability company
		
	By:	 	 /s/ John Jordan

		 	Name:	 	 John Jordan

		 	Title:	 	 CEO

	
	COMPANY:
	
	GW HOLDINGS I LLC, Delaware limited liability company
		
	By:	 	 /s/ John Jordan

		 	Name:	 	 John Jordan

		 	Title:	 	 CEO

	
	EMPLOYEE:
	
	 /s/ Randall Holder

	Randall Holder

  
 10Diamondback Employment Agreement

 EXHIBIT 10.20 
 DIAMONDBACK EMPLOYMENT AGREEMENT 
 THIS EMPLOYMENT
AGREEMENT (the “Agreement”) is made effective for all purposes as of September 1, 2008 (the “Effective Date”), by and among Diamondback Holdings, LLC, (the “Company”), and Danny Ward (the “Employee”).

 In consideration of the mutual terms and provisions of this Agreement, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and the Employee agree as follows: 
 1. Employment. The Company, the sole owner of Diamondback Quantum LLC, Diamondback-Directional Drilling LLC, and Diamondback-Downhole Technologies, LLC (the “Drilling Technologies
Segment”), hereby agrees to employ the Employee and the Employee accepts such employment by the Company subject to the terms and subject to the conditions hereinafter set forth. The Employee is engaged as an employee of the Company and the
Employee and the Company do not intend to create a joint venture, partnership or other relationship that might impose a fiduciary obligation on the Employee or the Company in the performance of this Agreement. 

2. Term. The employment relationship evidenced by this Agreement is an “at will” employment relationship
which means that the Company has the right to terminate the Employee at any time with or without cause as provided herein and the Employee has the right to end his employment at any time with or without cause as provided herein. In the absence of
such termination, this Agreement will end on September 1, 2011. 
 3. Duties. The Employee shall be
employed on a full time basis by the Company in the position of Director of Operations and shall perform such duties as are consistent with such positions. Notwithstanding the foregoing, the Employee’s position and duties may be modified or
changed from time to time at the sole discretion of the Company’s Board (the “Board”) or Officers (the “Officers”). The Employee agrees to use his best efforts to faithfully perform the Employee’s duties and
responsibilities under this Agreement. 
 4. Time to be Devoted to Employment. During the term of this
Agreement, the Employee shall devote all of Employee’s working time, attention and energies to the performance of Employee’s duties and responsibilities under this Agreement. The Employee shall not engage in any business activity that, in
the reasonable judgment of the Board or Officers, conflicts with the Employee’s duties hereunder, whether or not such activity is pursued for gain, profit, or other pecuniary advantage. In addition, the Employee shall not, unless approved by
the Company’s Board or Officers in writing: (a) engage in activities which require such substantial services on the part of the Employee that the Employee is unable to perform the duties assigned to the Employee in accordance with this
Agreement; (b) serve as an officer or director of any publicly held entity; or (c) directly or indirectly invest in, participate in or acquire an interest in any business that provides services or materials to the oil and gas industry. The
foregoing will not prohibit ownership of publicly traded securities. 

 5. Compensation; Benefits: Reimbursement. 

(a) The Company shall pay to the Employee a base salary (the “Base Salary”) payable in such
installments as is generally the policy of the Company with respect to the regular compensation of its employees generally. The Base Salary shall be at a rate of $300,000 per annum beginning on the Effective Date, increase to $325,000 on the first
anniversary of the Effective Date, and increase to $350,000 on the second anniversary of the Effective Date. 
 (b) The Company shall pay to the Employee a bonus (the “Bonus”) for performance and retention payable as is generally the policy of the Company with respect to such compensation. 

(i) The Bonus paid for performance shall be based on quarterly EBITDA of the Drilling Technologies Segment
according to Exhibit A, paid at the rate of $25,000 for each quarter that the meets or exceeds the EBITDA numbers, and $25,000 for meeting or exceeding each of four quarterly EBITDA numbers as shown in Exhibit A. 

(ii) The Bonus paid for retention shall be based on the Employee’s continued employment on each
anniversary of the Effective Date and paid at the rate of $50,000 per year. 
 (c) The Company
shall provide the Employee with such employee benefits as are provided by the Company from time to time to its employees generally. 
 (d) During the Employment Period, the Employee shall be entitled to twenty days of paid time off annually (“Vacation”), in addition to holidays observed by the Company, implemented as is
currently the policy of the Company. 
 (e) The Company shall, in accordance with the
Company’s regular policies with respect to the reimbursement of expenses, reimburse the Employee for all reasonable and necessary expenses and other disbursements incurred by the Employee for or on behalf of the Company in connection with the
performance of the Employee’s duties hereunder upon presentation of appropriate receipts therefor. 
 (f) The Company shall, in accordance with the Company’s regular policies with respect to grants of stock options, restricted stock, or similar incentives, provide Employee with such incentive upon an
initial public offering. 
 6. Termination. The Employee’s employment will continue in effect until
the expiration of the term set forth in paragraph 2 of this Agreement unless earlier terminated pursuant to this paragraph 6. 
 (a) Incapacity. If the Employee is incapacitated or disabled by accident, sickness or otherwise so as to render him mentally or physically incapable of performing the services required to be
performed by the Employee hereunder (such condition being referred to in this Agreement as a “Disability”) for a period of ninety (90) consecutive 

 
days, or for an aggregate of one hundred twenty (120) days during any twelve-month period, the Company may, at its option, terminate the employment of the Employee under this Agreement upon
giving the Employee at least fifteen (15) days prior written notice to that effect. Any termination occurring pursuant to this Paragraph 6(a) is called an “Involuntary Termination” in this Agreement. In applying this paragraph, the
Company will comply with any applicable legal requirements, including the Americans with Disabilities Act. 
 (b) Death. If the Employee dies during the term of this Agreement, Employee’s employment will terminate without compensation to the Employee’s estate in accordance with the general
policies of the Company. 
 (c) For Cause. The Company may terminate the employment of the
Employee hereunder at any time for Cause (as hereinafter defined) (such a termination being referred to in this Agreement as a “Termination For Cause”) by giving the Employee written notice of such termination, which shall take effect
immediately upon the giving of such notice to the Employee. As used in this Agreement, “Cause” means (A) the Employee’s breach or threatened breach of this Agreement; (B) the Employee’s breach of fiduciary duty
(C) the misappropriation or fraudulent conduct by the Employee with respect to the assets or operations of the Company or any of its subsidiaries or affiliated companies; (D) the Employee’s disregard of the instructions of the Board
or Officers or the Employee’s neglect of duties or failure to act, other than by reason of disability or death; (E) the Employee’s personal misconduct which injures the Company; or (F) the conviction of the Employee for, or a
plea of guilty or no contest to, a felony or any crime involving fraud, theft or dishonesty. 

(d) Without Cause. The Company may terminate the employment of the Employee hereunder without Cause
(such a termination being referred to in this Agreement as a “Termination Without Cause”) by providing the Employee with 10 days written notice of such termination, such termination to take effect on the date specified in such notice,
which date shall not be earlier than the date of such notice. 
 (e) Voluntary. The
Employee may voluntarily resign from his employment hereunder at any time by giving the Company written notice of such resignation at least 10 days prior to the effective date of such resignation; provided, the Company may in its sole discretion,
elect to waive all or any part of the 10-day notice period. Any termination of the Employee’s employment hereunder pursuant to the Employee’s voluntary resignation in accordance with this Paragraph 6(e) is referred to herein as a
“Voluntary Termination.” 
 7. Effect of Termination. 

(a) Upon the termination of the Employee’s employment hereunder due to an Involuntary Termination, a
Termination for Cause or a Voluntary Termination, neither the Employee nor his beneficiary or estate shall have any further rights or claims against the Company or any of its affiliates under this Agreement, except to receive

 
reimbursement for any expenses for which the Employee shall not have been previously reimbursed as provided in Paragraph 5(e). 

(b) Upon the termination of the Employee’s employment hereunder due to a Termination Without Cause,
neither the Employee nor his beneficiary or estate shall have any further rights or claims against the Company or any of its affiliates under this Agreement, except (i) to receive the amounts set forth in Paragraph 7(a) above, and
(ii) subject to receipt by the Company of an executed release and confidentiality agreement in favor of the Company and its affiliates, in a form and substance acceptable to the Company in its sole discretion to continue to receive the Base
Salary through the remainder of the term at the same times and in the same manner in which such Base Salary was payable to the Employee immediately prior to the termination date. 

(c) Upon the conditions of (i) termination of Employees employment hereunder, and (ii) the sale
of substantially all the assets of the Drilling Technologies Segment to an entity not affiliated with Wexford Capital, all the Base Salary for the remainder of the Term, contemplated under Paragraph 5(a) above, shall become payable to Employee
within sixty (60) days of such sale. 
 8. Confidential Information. 

(a) The Employee acknowledges and recognizes that during the term of this Agreement the Employee will be
privy to trade secrets and confidential proprietary information critical to the Company and its subsidiaries and affiliates (collectively, “Confidential Information”), and further acknowledges that the Company would be irreparably damaged
if the Confidential Information possessed by Employee were disclosed to or utilized by or on behalf of others in competition with the Company or its subsidiaries or affiliated companies. Such Confidential Information includes, without limitation,
information relating to the nature and operation of the business of the Company and its subsidiaries or affiliated companies including any companies which the Company has identified for potential acquisition, the persons, firms and corporations
which arc customers or active prospects of the Company during the Employee’s employment by the Company, the Company’s development, transition and transformation plans, methodology and methods of doing business, strategic, acquisition,
marketing and expansion plans, including plans regarding planned and potential acquisitions and sales, financial and new and existing programs and services (and those under development), prices and terms, customer service, integration processes
requirements, costs of providing service, support and equipment and equipment maintenance costs as well as the Company’s trade secrets. 
 (b) During the Employment Period and at all times thereafter, the Employee will preserve and protect as confidential all of the Confidential Information known to the Employee or at any time in the
Employee’s possession or control. In addition, during the Employment Period and at all times thereafter, the Employee will not disclose to any unauthorized person or use for his own account any of such Confidential Information without the
Board’s or an Officer’s written consent. The Employee agrees to deliver to the Company at the termination of the Employee’s employment, or at any other time the 

 
Company may request in writing, all memoranda, notes, plans, records, reports and other documents (and copies thereof) containing or otherwise relating to any of the Confidential Information
(including, without limitation, all acquisition prospects, customer lists, and contact information) which the Employee may then possess or have under the Employee’s control. The Employee acknowledges that all such memoranda, notes, plans,
records, reports and other documents are and at all times will be and remain the property of the Company. 
 (c) The Employee will fully comply with any agreement reasonably required by any of the Company’s customers, suppliers or contractors with respect to the protection of the confidential or proprietary
information of such entities. 
 9. Proprietary Rights. 

(a) The Employee acknowledges and agrees that the Company owns all right, title and interest (including
patent rights, copyrights, trade secret rights, trademark rights and all other intellectual and industrial property rights) relating to any and all inventions (whether or not patentable), works of authorship, design, know-how, ideas and information
made or conceived or reduced to practice, in whole or in part, by the Employee during the term of this Agreement which are useful in, or directly or indirectly related to, the business of the Company or any Confidential Information (collectively,
the “Proprietary Rights”). The Employee further acknowledges and agrees that all such Proprietary Rights are “works made for hire” of which the Company is the author. The Employee agrees to promptly disclose and provide all
Proprietary Rights to the Company; provided, in the event the Proprietary Rights shall not be deemed to constitute “works made for hire,” or in the event the Employee should, by operation of law or otherwise, be deemed to retain any rights
in the Proprietary Rights, the Employee agrees to assign to the Company, without further consideration, the Employee’s entire right, title and interest in and to each and every such Proprietary Right. 

(b) The Employee hereby agrees to assist Company in obtaining and enforcing United States and/or foreign
letters patent and copyright registrations covering the Proprietary Rights and further agrees that Employee’s obligation to assist Company shall continue beyond the termination of Employee’s employment hereunder. If Company is unable
because of Employee’s mental or physical incapacity or for any other reason to secure Employee’s signature to apply for or to pursue any application for any United States or foreign letters patent or copyright registrations covering
inventions assigned to Company, then Employee hereby irrevocably designates and appoints Company and its duly authorized officers and agents as Employee’s agent and attorney-in-fact to act for and on Employee’s behalf to execute and file
any such applications and to do all other lawfully permitted acts to further the prosecution and issuance of letters patent or copyright registrations thereon with the same legal force and effect as if executed by Employee. Employee hereby waives
and quitclaims to Company any and all claims of any nature whatsoever which Employee now or hereafter may have for infringement of any patent or copyright resulting from any such application for letters patent or copyright registrations assigned
hereunder to Company. Employee will further assist Company in every lawful way to enforce any copyrights or patents obtained, 

 
including without limitation, testifying in any suit or proceeding involving any of the copyrights or patents or executing any documents deemed necessary by Company, all without further
consideration except as contemplated by the immediately following sentence but at the expense of Company. If Employee is called upon to render such assistance after termination of Employee’s employment hereunder, then Employee shall be entitled
to a fair and reasonable per diem fee (which shall not be less than Employee’s equivalent daily Base Salary) in addition to reimbursement of any expenses incurred at the request of Company. 

10. Non-Solicitation. The Employee agrees that during the Non-Solicitation Period (as hereafter defined), Employee
will not directly, either personally or by or through his agent, on behalf of himself or on behalf of any other individual, association or entity, (i) use any of the Confidential Information for the purposes of calling oh any established
customer of the Company or any potential customer which has been identified or contacted by the Company or soliciting or inducing any of such customers to acquire, or providing to any of such customers, any product or service provided by the Company
or any affiliate or subsidiary of the Company; (ii) solicit, influence or encourage any established customer of the Company to divert or direct such customer’s business to the Employee or any person or entity by which or with which the
Employee is employed, associated, affiliated or otherwise related; or (iii) solicit, divert or attempt to solicit or divert any entity which has been identified and contacted by the Company, either directly or through such entity’s
agent(s), with respect to a possible acquisition by the Company. For the purposes hereof, the term “Non-Solicitation Period” shall mean a period of six months after Employee’s employment ends for any reason. 

11. Non-Interference. The Employee agrees that during the Non-interference Period (as hereafter defined) he will
not, directly or indirectly, either personally or by or through his agent, on behalf of himself or on behalf of any other individual, association or entity, hire, solicit or seek to hire any employee of the Company or any affiliate or subsidiary of
the Company, or any individual who was an employee of the Company or any affiliate or subsidiary of the Company during the twelve-month period prior to the Termination Date, or in any other manner attempt, directly or indirectly, to persuade any
such employee to discontinue his or her status of employment with the Company or any affiliate or subsidiary of the Company or to become employed in a business or activities likely to be competitive with the business of the Company or any affiliate
or subsidiary of the Company. For the purposes hereof, the term “Non-Interference Period” shall mean a period of six months after Employee’s employment and for any reason. 

12. Non-Competition. During the period of Employee’s employment and for a period ending six (6) months
after the Employee’s termination of employment for any reason, the Employee will not engage in a business that competes with the Company by providing the same or similar products and services in any state where Company offers such on the date
of termination of the Employee. 
 13. Severability. It is the desire and intent of the parties hereto
that the provisions of this Agreement be enforced to the fullest extent permissible under the laws and public policies applied in each jurisdiction in which enforcement is sought. Accordingly, if any particular provision of this Agreement shall be
adjudicated by a court of competent jurisdiction to be invalid, prohibited or unenforceable for any reason, such provision, as to such jurisdiction, shall 

 
be ineffective, without invalidating the remaining provisions of this Agreement or affecting the validity or enforceability of such provision in any other jurisdiction. Notwithstanding the
foregoing, if such provision could be more narrowly drawn so as not to be invalid, prohibited or unenforceable in such jurisdiction, it shall, as to such jurisdiction, be so narrowly drawn, without invalidating the remaining provisions of this
Agreement or affecting the validity or enforceability of such provision in any other jurisdiction. 
 14.
Remedies. The Employee acknowledges and understands that the provisions of this Agreement are of a special and unique nature, the loss of which cannot be adequately compensated for in damages by an action at law, and that the breach or
threatened breach of the provisions of this Agreement would cause the Company or any of its subsidiaries irreparable harm. In the event of a breach or threatened breach by the Employee of the provisions of this Agreement, the Company or any of its
subsidiaries or affiliates shall be entitled to an injunction restraining the Employee from such breach. In addition to the foregoing and not in any way in limitation thereof, or in limitation of any right or remedy otherwise available, if the
Employee violates any provision of Paragraphs 8, 9, 10, or 11 hereof, any compensation or severance payments then or thereafter due from the Company to the Employee shall be terminated forthwith and the Company’s obligation to pay and the
Employee’s right to receive such compensation as severance payments shall terminate and be of no further force or effect, in each case without limiting or affecting the Employee’s obligations under such Paragraphs 8, 9, 10, and 11 or the
Company’s or its subsidiaries’ or affiliates’ other rights and remedies available at law or equity. Nothing contained in this Agreement shall be Agreement shall be construed as prohibiting the Company or any of its subsidiaries or
affiliates from pursuing, or limiting the Company’s or any of its subsidiaries’ or affiliates’ ability to pursue, any other remedies available for any breach or threatened breach of this Agreement by the Employee. The provisions of
Paragraph 18 of this Agreement relating to arbitration shall not be applicable to the Company to the extent it seeks an injunction in any court to restrain the Employee from violating Paragraphs 8, 9, 10, or 11 hereof. 

15. Employee’s Representations. The Employee hereby represents and warrants to the Company that the
execution, delivery and performance of this Agreement by the Employee does not and will not conflict with, breach, violate or cause a default under any agreement, contract or instrument to which the Employee is a party or any judgment, order or
decree to which the Employee is subject. 
 16. Notices. All notices, claims, certificates, requests,
demands and other communications hereunder shall be in writing and shall be deemed to have been duly given and delivered if (a) delivered personally, (b) sent by nationally-recognized overnight courier guaranteeing next business day
delivery, (c) sent by facsimile or (d) sent by registered or certified mail, postage prepaid, return receipt requested and addressed as follows: 

 (i) if to the Company, to: 

Diamondback Holdings, LLC 
 14301 Caliber Drive, Suite 200 
 Oklahoma City, OK 73134 

Attention: General Counsel 
 Telephone: (405)242-4080 
 Facsimile: (405)242-4081 

(ii) if to the Employee, to the address specified following the Employee’s signature below.

 or to such other address as the party to whom notice is to be given may have furnished to each other party in
writing in accordance herewith. Any such notice or communication shall be deemed to have been received (i) in the case of personal delivery, on the date of such delivery, (ii) in the case of nationally-recognized overnight courier, on the
next business day after the date when sent, (iii) in the case of facsimile transmission, when received, and (iv) in the case of mailing, on the fifth Business Day following that on which the piece of mail containing such communication is
posted. As used herein, “Business Day” means a day that is not a Saturday, Sunday or a day on which banking institutions in Oklahoma arc not required to be open. 

17. Amendment and Waiver. No waiver, amendment or modification of any provision of this Agreement shall be
effective unless in writing and signed by each party hereto. No failure or delay by any party in exercising any right, power or remedy under this Agreement shall operate as a waiver thereof or of any other right, power or remedy. The waiver by any
party hereto of a breach of any provision of this Agreement shall not operate or be construed as a waiver of any subsequent breach. 
 18. Governing Law. This Agreement is being entered into by the Company in the State of Oklahoma. Except as provided for in Section 18 above, all questions concerning the construction,
interpretation and validity of this Agreement shall be governed by and construed and enforced in accordance with the domestic laws of Oklahoma, without giving effect to any choice or conflict of law provision or rules (whether in Oklahoma or any
other jurisdiction) that would cause the application of the laws of any jurisdiction. 
 19. Entire
Agreement. This Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior or contemporaneous negotiations, correspondence, understandings and agreements between the parties
with respect thereto, whether oral or written. 
 20. Binding Effect; Third Party Beneficiary;
Assignment. This Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective affiliates, officers, employees, agents, successors and assigns (including, in the case of the Company or any of its
subsidiaries or affiliated companies, the successor to the business of the Company as a result of the transfer of all or substantially all of the assets or capital stock of the Company or any of its subsidiaries or affiliates); provided, that the
Employee may not assign this Agreement or any of 

 
his rights or interests herein, in whole or in part, to any other person or entity without the prior written consent of the Company. 

21. Headings. The paragraph headings contained in this Agreement are for reference purposes only and shall not
affect in any way the meaning or interpretation of this Agreement. 
 22. Counterparts. This Agreement
may be executed in any number of counterparts, and each such counterpart shall be deemed to be an original instrument, but all such counterparts together shall constitute one and the same agreement. A telecopy or a facsimile transmission of a signed
counterpart of this Agreement shall be sufficient to bind the party or parties whose signature(s) appear thereon. 
 23. Effectiveness. This Agreement shall be effective for all purposes as of the close of business on the Effective Date. 

24. No Other Contractual Obligations. Employee represents and warrants that he is under no valid contractual
obligations that would prevent him from entering into this Agreement with the Company. In addition, Employee acknowledges and agrees that he is prohibited from utilizing in his employment with the Company any legally protected confidential and
proprietary information belonging to a third party. 
 IN WITNESS WHEREOF, the parties have
executed this Agreement on the date specified immediately following their respective signatures below. 
  

			
	 COMPANY: Diamondback Holdings, LLC

		
	 By:
	 	 /s/ Arty Straehala

	 Name:
	 	 Arty Straehala

	 Title:
	 	 Chief Executive Officer

		
	 Date:
	 	 9/22/08

	
	 EMPLOYEE:

	
	 /s/ Danny Ward

	 Danny Ward

		
	 Date:
	 	 9/22/08

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