Underwriting Agreement, dated as of November 6, 2017, by and among ProPetro Holding Corp., the selling stockholders named therein and Goldman Sachs & Co. LLC, as representatives of the several underwriters named therein

Ladies and Gentlemen:

The stockholders of ProPetro Holding Corp., a Delaware corporation (the “Company”), named in Schedule II hereto (the “Selling Stockholders”) propose, subject to the terms and conditions stated in this agreement (this “Agreement”), to sell to the Underwriters named in Schedule I hereto (the “Underwriters”) an aggregate of 12,000,000 shares of common stock, par value $0.001 per share (“Stock”), of the Company, and, at the election of Goldman Sachs & Co. LLC (the “Option”), up to 1,800,000 additional shares of Stock. The aggregate of 12,000,000 shares of Stock to be sold by the Selling Stockholders is herein called the “Firm Shares” and the aggregate of 1,800,000 additional shares of Stock to be sold by the Selling Stockholders is herein called the “Optional Shares.” The Firm Shares and the Optional Shares that Goldman Sachs & Co. LLC elects to purchase pursuant to Section 2 hereof are herein collectively called the “Shares”.

1.(1)    The Company represents and warrants to, and agrees with, each of the Underwriters that:

(i)    A registration statement on Form S‑1 (File No. 333-221304) (the “Initial Registration Statement”) in respect of the Shares has been filed with the Securities and Exchange Commission (the “Commission”); the Initial Registration Statement and any post-effective amendment thereto, each in the form heretofore delivered to you and, excluding exhibits thereto, to you for each of the other Underwriters, have been declared effective by the Commission in such form; other than a registration statement, if any, (i) increasing the size of the offering (a “Rule 462(b) Registration Statement”), filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended (the “Act”), which became effective upon filing, or (ii) adding exhibits to the Initial Registration Statement (a “Rule 462 (d) Registration Statement”), filed pursuant to Rule 462(d) under the Act, which became effective upon filing, no other document with respect to the Initial Registration Statement has

heretofore been filed with the Commission; and no stop order suspending the effectiveness of the Initial Registration Statement, any post-effective amendment thereto or the Rule 462(b) Registration Statement or Rule 462(d) Registration Statement, if any, has been issued and no proceeding for that purpose has been initiated or, to the knowledge of the Company, threatened by the Commission (any preliminary prospectus included in the Initial Registration Statement or filed with the Commission pursuant to Rule 424(a) under the Act is hereinafter called a “Preliminary Prospectus”; the various parts of the Initial Registration Statement, the Rule 462(b) Registration Statement and the Rule 462(d) Registration Statement, if any, including all exhibits thereto and including the information contained in the form of final prospectus filed with the Commission pursuant to Rule 424(b) under the Act in accordance with Section 5(a) hereof and deemed by virtue of Rule 430A under the Act to be part of the Initial Registration Statement at the time it was declared effective, each as amended at the time such part of the Initial Registration Statement became effective or such part of the Rule 462(b) Registration Statement or Rule 462(d) Registration Statement, if any, became or hereafter becomes effective, are hereinafter collectively called the “Registration Statement”; the Preliminary Prospectus relating to the Shares that was included in the Registration Statement immediately prior to the Applicable Time (as defined in Section 1(a)(iii) hereof) is hereinafter called the “Pricing Prospectus”; such final prospectus, in the form first filed pursuant to Rule 424(b) under the Act, is hereinafter called the “Prospectus”; and any “issuer free writing prospectus” as defined in Rule 433 under the Act relating to the Shares is hereinafter called an “Issuer Free Writing Prospectus”);

(ii)    No order preventing or suspending the use of any Preliminary Prospectus or any Issuer Free Writing Prospectus has been issued by the Commission, and each Preliminary Prospectus, at the time of filing thereof, conformed in all material respects to the requirements of the Act and the rules and regulations of the Commission thereunder, and did not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through the Representative expressly for use therein (it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 9(c) hereof);

(iii)    For the purposes of this Agreement, the “Applicable Time” is 5:25 p.m. (Eastern time) on the date of this Agreement; the Pricing Prospectus, as supplemented by the information listed on Schedule III(c) hereto, taken together (collectively, the “Pricing Disclosure Package”), as of the Applicable Time, did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; and each Issuer Free Writing

Prospectus listed on Schedule III(a) hereto does not conflict with the information contained in the Registration Statement, the Pricing Prospectus or the Prospectus and each such Issuer Free Writing Prospectus, each as supplemented by and taken together with the Pricing Disclosure Package, as of the Applicable Time, did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to statements or omissions made in an Issuer Free Writing Prospectus in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through the Representative expressly for use therein (it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 9(c) hereof);

(iv)    No documents were filed with the Commission since the Commission’s close of business on the business day immediately prior to the date of this Agreement and prior to the execution of this Agreement, except as set forth on Schedule III(b) hereto;

(v)    The Registration Statement conforms, and the Prospectus and any further amendments or supplements to the Registration Statement and the Prospectus will conform, in all material respects to the applicable requirements of the Act and the rules and regulations of the Commission thereunder and do not and will not, as of the applicable effective date as to each part of the Registration Statement and as of the applicable filing date as to the Prospectus and any amendment or supplement thereto, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through the Representative expressly for use therein (it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 9(c) hereof);

(vi)    Neither the Company nor any of its subsidiaries has sustained since the date of the latest audited financial statements included in the Pricing Prospectus any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, other than as set forth or contemplated in the Pricing Prospectus; and, since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, there has not been any change in the capital stock or long-term debt of the Company or any of its subsidiaries or any material adverse change, or any development involving a prospective material adverse change, in or affecting the business, properties, general affairs, management, financial position, stockholders’ equity or results of operations

of the Company and its subsidiaries or the ability of the Company to perform its obligations under, or consummate the transaction contemplated by, this Agreement (any of the foregoing, a “Material Adverse Effect”), otherwise than as set forth or contemplated in the Pricing Prospectus;

(vii)    The Company and its subsidiaries have good and marketable title in fee simple to all real property and good and marketable title to all personal property owned by them, in each case free and clear of all liens, encumbrances and defects except such as are described in the Pricing Prospectus or such as do not materially affect the value of such property and do not interfere with the use made and proposed to be made of such property by the Company and its subsidiaries; and any real property and buildings held under lease by the Company and its subsidiaries are held by them under valid, subsisting and enforceable leases with such exceptions as are not material and do not interfere with the use made and proposed to be made of such property and buildings by the Company and its subsidiaries;

(viii)    The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware, with power and authority to own its properties and conduct its business as described in the Pricing Prospectus, and has been duly qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it owns or leases properties or conducts any business so as to require such qualification, except where the failure to be duly qualified or in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and each subsidiary of the Company has been, as the case may be, (A) duly incorporated and is validly existing as a corporation in good standing under the laws of its jurisdiction of incorporation or (A) duly formed and is validly existing as a limited liability company in good standing under the laws of the jurisdiction of its formation, except, in each case, where the failure to be duly qualified or in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect;

(ix)    The Company has an authorized capitalization as set forth in the Pricing Prospectus and all of the issued shares of capital stock of the Company, including the Shares to be sold by the Selling Stockholders, have been duly and validly authorized and issued and are fully paid and non-assessable and conform to the description of the Stock contained in the Pricing Disclosure Package and the Prospectus; and all of the issued shares of capital stock of each subsidiary of the Company have been duly and validly authorized and issued, are fully paid and non-assessable and are owned directly or indirectly by the Company, free and clear of all liens, encumbrances, equities or claims (“Liens”), except (A) Liens under the Credit Agreement, dated as of March 22, 2017, by and among the Company, ProPetro Services, Inc., Barclays Bank PLC, as the Agent, the Collateral Agent, a Letter of Credit Issuer and the Swingline Lender, and each of the lenders from time to time

party thereto (the “Credit Facility”) and (A) as disclosed in the Pricing Disclosure Package and the Prospectus;

(x)    The offering and sale of the Shares as described in the Pricing Prospectus and the execution, delivery and compliance by the Company with this Agreement and the consummation of the transactions herein contemplated will not conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, (A) any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries is bound or to which any of the property or assets of the Company or any of its subsidiaries is subject, (A) the certificate of incorporation, by-laws, certificate of formation, limited liability company agreement or other organizational document (the “Organizational Documents”), as the case may be, of the Company or any of its subsidiaries, or (A) any statute or any judgment, order, rule or regulation of any court or governmental agency or body having jurisdiction over the Company or any of its subsidiaries or any of their properties, except in the case of clause (A) as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and no consent, approval, authorization, order, registration or qualification of or with any such court or governmental agency or body is required for the offering and sale of the Shares by the Selling Stockholders or the consummation by the Company and the Selling Stockholders of the transactions contemplated by this Agreement, except for the registration under the Act of the Shares, and such consents, approvals, authorizations, orders, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Shares by the Underwriters;

(xi)    Neither the Company nor any of its subsidiaries is in violation of (A) its Organizational Documents or (A) in default in the performance or observance of any material obligation, agreement, covenant or condition contained in any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which it is a party or by which it or any of its properties may be bound, except in the case of clause (B) for any such default that would not, individually or in the aggregate, have a Material Adverse Effect;

(xii)    The statements set forth in the Pricing Prospectus and the Prospectus under the caption “Description of Capital Stock”, insofar as they purport to constitute a summary of the terms of the Stock, and under the caption “Material U.S. Federal Income Tax Consequences to Non-U.S. Holders”, insofar as they purport to describe the provisions of the laws and documents referred to therein, are accurate, complete, and fair;

(xiii)    Other than as set forth in the Pricing Prospectus, there are no legal or governmental proceedings pending to which the Company or any of its subsidiaries or, to the Company’s knowledge, any officer or director of the Company, is a party

or of which any property or assets of the Company or any of its subsidiaries or, to the Company’s knowledge, any officer or director of the Company, is the subject which, if determined adversely to the Company or any of its subsidiaries (or such officer or director), would individually or in the aggregate, have a Material Adverse Effect; and, to the best of the Company’s knowledge, no such proceedings are threatened or contemplated by governmental authorities or threatened by others;

(xiv)    from the time of initial confidential submission of a registration statement relating to the Shares with the Commission (or, if earlier, the first date on which an oral or written communication with potential investors undertaken in reliance on Section 5(d) of the Act (a “Section 5(d) Communication”) was made) through the date hereof, the Company has been and is an “emerging growth company” as defined in Section 2(a)(19) of the Act (an “Emerging Growth Company”);

(xv)    The Company and each of its subsidiaries are not and, after giving effect to the offering and sale of the Shares and the application of the proceeds thereof, will not be an “investment company”, as such term is defined in the Investment Company Act of 1940, as amended (the “Investment Company Act”);

(xvi)    At the time of filing the Initial Registration Statement and any post-effective amendment thereto, at the earliest time thereafter that the Company or any offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) under the Securities Act) of the Shares, and at the date hereof, the Company was not and is not an “ineligible issuer”, as defined in Rule 405 under the Act;

(xvii)    Deloitte & Touche LLP (“Deloitte”), who have certified certain financial statements of the Company and its subsidiaries, are independent public accountants as required by the Act and the rules and regulations of the Commission thereunder;

(xviii)    The Company maintains a system of internal control over financial reporting (as such term is defined in Rule 13a-15(f) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) that complies with the requirements of the Exchange Act and has been designed by the Company’s principal executive officer and principal financial officer, or under their supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles in the United States.

Except as described in the Registration Statement, the Pricing Disclosure Package or the Prospectus, the Company’s internal control over financial reporting is effective and the Company is not aware of any material weaknesses in its internal control over financial reporting. The Company’s internal control over financial reporting is sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorization; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity

with generally accepted accounting principles and to maintain accountability for assets; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. There is and has been no failure on the part of the Company and any of the Company’s directors or officers, in their capacities as such, to comply with any provision of the Sarbanes-Oxley Act of 2002 and all rules and regulations promulgated thereunder or implementing the provisions thereof applicable to the Company;

(xix)    Since the date of the latest audited financial statements included in the Pricing Prospectus, there has been no change in the Company’s internal control over financial reporting that has materially and adversely affected, or is reasonably likely to materially and adversely affect, the Company’s internal control over financial reporting;

(xx)    The Company maintains disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Exchange Act) that comply with the requirements of the Exchange Act; such disclosure controls and procedures have been designed to ensure that material information relating to the Company and its subsidiaries is made known to the Company’s principal executive officer and principal financial officer by others within those entities; and such disclosure controls and procedures are effective in all material respects to perform the functions for which they were established;

(xxi)    This Agreement has been duly authorized, executed and delivered by the Company;

(xxii)    None of the Company, any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee, affiliate or other person associated with or acting on behalf of the Company or any of its subsidiaries has (i) used any corporate funds for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity; (ii) made or taken an act in furtherance of an offer, promise or authorization of any direct or indirect unlawful payment to any foreign or domestic government official or employee from corporate funds, including of any government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of the foregoing, or any political party, party official or candidate for political office; (iii) violated or is in violation of any provision of the Foreign Corrupt Practices Act of 1977, as amended (the “FCPA”), the Bribery Act 2010 of the United Kingdom (the “UK Bribery Act”), any applicable law or regulation implementing the OECD Convention on Combating Bribery of Foreign Public Officials in International Business Transactions (the “OECD Anti-Bribery Convention”) or any other applicable anti-bribery or anti-corruption law; or (iv) made any bribe, rebate, payoff, influence payment, kickback or other unlawful payment, or offered, agreed,

requested or promised to make any such payment or taken an act in furtherance of any unlawful bribe or other unlawful benefit, including, without limitation, any rebate, payoff, influence, benefit, kickback or other unlawful or improper payment or benefit. The Company and its subsidiaries have instituted, maintain and enforce, and will continue to maintain and enforce policies and procedures designed to promote and ensure compliance with all applicable anti-bribery and anti-corruption laws;

(xxiii)    The operations of the Company and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements, including those of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency having jurisdiction over the Company or any of its subsidiaries (collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened;

(xxiv)    (A) None of the Company, any of its subsidiaries or, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries (i) is currently the subject or the target of any sanctions administered or enforced by the U.S. Government, including, without limitation, the Office of Foreign Assets Control of the U.S. Department of the Treasury (the “Treasury Department”), or the U.S. Department of State and including, without limitation, the designation as a “specially designated national” or “blocked person,” the European Union, Her Majesty’s Treasury, the United Nations Security Council, or other relevant sanctions authority (collectively, “Sanctions”), (ii) is located, organized or resident in any country or territory that is the subject or target of Sanctions or does any business with or involving the government of, or any person or project located in, any country targeted by any Sanctions or (iii) supports or facilitates any such business or project; (A) the Company is not controlled (within the meaning of the executive orders or regulations promulgating Sanctions) by any government or person that is the subject or target of Sanctions; and (A) the Company has implemented and maintains adequate internal controls and procedures to monitor and audit transactions that are reasonably designed to detect and prevent any action that is inconsistent with any of the Company’s representations and obligations under this paragraph. For the past five years, the Company and its subsidiaries have not knowingly engaged in and are not now knowingly engaged in any dealings or transactions with any person that at the time of the dealing or transaction is or was the subject or target of, or in any country or territory that is the subject or target of, Sanctions;

(xxv)    Each “employee benefit plan” (within the meaning of Section 3(3) of the Employee Retirement Security Act of 1974, as amended (“ERISA”)) for which the Company or any member of its “Controlled Group” (defined as any organization which is a member of a controlled group of corporations within the meaning of Section 414 of the Internal Revenue Code of 1986, as amended (the “Code”) or 4001 of ERISA) would have any liability (each a “Plan”) (i) complies in form with the requirements of all applicable statutes, rules and regulations including ERISA and the Code, and has been maintained and administered in substantial compliance with its terms and with the requirements of all applicable statutes, rules and regulations including ERISA and the Code; (ii) with respect to each Plan subject to Title IV of ERISA or Section 302 of ERISA or Sections 412 and 430 of the Code (a) no “reportable event” (within the meaning of Section 4043(c) of ERISA) has occurred or is reasonably expected to occur, (b) no failure to satisfy the minimum funding standard (within the meaning of Section 302 of ERISA or Sections 412 and 430 of the Code), whether or not waived, has occurred or is reasonably expected to occur, (c) the fair market value of the assets under each Plan (excluding for these purposes accrued but unpaid contributions) exceeds the present value of all benefits accrued under such Plan (determined based on those assumptions used to fund such Plan) and (d) neither the Company nor any member of its Controlled Group has incurred, or reasonably expects to incur, any liability under Title IV of ERISA in respect of a Plan (including a “multiemployer plan”, within the meaning of Section 4001(c)(3) of ERISA); (iii) each Plan that is intended to be qualified under Section 401(a) of the Code is so qualified and nothing has occurred, whether by action or by failure to act, which would cause the loss of such qualification; and (iv) no prohibited transaction, within the meaning of Section 406 of ERISA or Section 4975 of the Code, has occurred with respect to any Plan excluding transactions to which a statutory or administrative prohibited transaction exemption applies;

(xxvi)    Except as disclosed in the Pricing Prospectus and the Prospectus, the Company and its subsidiaries (A) are in compliance with any and all applicable foreign, federal, state and local laws and regulations relating to the protection of human health and safety (to the extent related to exposure to hazardous or toxic substances or wastes, pollutants, or contaminants), or the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations imposing liability or standards of conduct concerning, or relating to the release or threatened release of, any pollutants, chemicals, contaminants, solid or hazardous wastes, materials, substances, any petroleum or petroleum products, or any polychlorinated biphenyls or radioactive materials (collectively, “Hazardous Materials”) or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport, arrangement for disposal or transport, release, threatened release or handling of, or exposure to, Hazardous Materials (collectively, “Environmental Laws”), (A) have received and are in compliance with all permits, licenses or other approvals required of them under applicable Environmental Laws to conduct their respective businesses as they are currently being conducted and as they are proposed

to be conducted on each Time of Delivery (as defined in Section 4 hereof), (A) have not received written notice of any actual or potential liability under any Environmental Law and (A) are not a party to, nor are their operations the subject of, any pending or, to the Company’s knowledge, threatened action, suit or proceeding relating to any alleged violation of any Environmental Law or relating to any actual or alleged release or threatened release or cleanup at any location of any hazardous or toxic substances or wastes, pollutants or contaminants, except in each case of clause (A) through (D), to the extent such matters would be reasonably likely to result in a Material Adverse Effect. Neither the Company nor any of its subsidiaries has been notified in writing that they are currently named as a “potentially responsible party” under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended, except as would not, individually or in the aggregate, be reasonably likely to result in a Material Adverse Effect;

(xxvii)    In the ordinary course of its business, the Company periodically reviews the effect of Environmental Laws on the business, operations and properties of the Company and its subsidiaries, in the course of which it identifies and evaluates associated costs and liabilities (including, without limitation, any capital or operating expenditures required for clean-up, closure of properties or compliance with Environmental Laws, or any permit, license or approval, any related constraints on operating activities and any potential liabilities to third parties). On the basis of such review, the Company has concluded that such reasonably anticipated associated costs and liabilities would not have a Material Adverse Effect, except as described in the Registration Statement, the Pricing Prospectus and the Prospectus;

(xxviii)    (A) Except as disclosed in the Pricing Prospectus, there are no persons with registration rights or other similar rights to have any securities registered pursuant to the Registration Statement or otherwise registered by the Company under the Act except as have been validly waived or complied with and (A) the holders of outstanding shares of the Company’s capital stock are not entitled to preemptive or other rights to subscribe for the Shares that have not been complied with or otherwise effectively waived;

(xxix)    Any statistical, industry-related and market-related data included in the Pricing Prospectus and the Prospectus are based on or derived from sources that the Company believes to be reliable and accurate and, to the extent required, the Company has obtained the written consent to the use of such data from such sources where applicable;

(xxx)    The Company and its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the business in which it is engaged; and the Company has no reason to believe that it will not be able to renew its existing insurance coverage

as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business;

(xxxi)    The Company and its subsidiaries have filed all foreign, federal, state and local tax returns that are required to be filed or have obtained or requested extensions thereof, except where the failure so to file would not, individually or in the aggregate, result in a Material Adverse Effect, and has paid all taxes (including, without limitation, any estimated taxes) required to be paid and any other assessment, fine or penalty, to the extent that any of the foregoing is due and payable, except for any such tax, assessment, fine or penalty that is currently being contested in good faith by appropriate actions and for which adequate reserves have been established in accordance with GAAP and except for such taxes, assessments, fines or penalties the nonpayment of which would not, individually or in the aggregate, result in a Material Adverse Effect;

(xxxii)    The Company and its subsidiaries have no off-balance sheet arrangements (as defined in Regulation S‑K Item 303(a)(4)(ii)) that may have a material current or future effect on the Company’s financial condition, changes in financial condition, results of operations, liquidity, capital expenditures or capital resources, except as disclosed in the Registration Statement, the Pricing Prospectus and the Prospectus;

(xxxiii)    The Company has not sold or issued any shares of Stock during the six-month period preceding the date of the Prospectus, including any sales pursuant to Rule 144A or Regulation D of the Act, other than (i) shares issued pursuant to employee benefit plans, stock option plans or other employee compensation plans or pursuant to outstanding options, rights or warrants, or (ii) as disclosed in the Pricing Prospectus and the Prospectus;

(xxxiv)    The Company has not and, to its knowledge, no one acting on its behalf has, (i) taken and will not take, directly or indirectly, any action which is designed to or which has constituted or which would reasonably be expected to cause or result in stabilization or manipulation of the price of any security of the Company or any of its subsidiaries to facilitate the sale or resale of the Shares or result in a violation of Regulation M under the Exchange Act, (ii) sold, bid for, purchased, or paid anyone any compensation for soliciting purchases of, the Shares, or (iii) paid or agreed to pay to any person any compensation for soliciting another to purchase any other securities of the Company or any of its subsidiaries other than as contemplated in this Agreement;

(xxxv)    There are no relationships or related-party transactions involving the Company, any of the subsidiaries or consolidated affiliated entities, or any other person required to be described in the Registration Statement, the Pricing Prospectus and the Prospectus which have not been described as required;

(xxxvi)    No material labor dispute with the employees of the Company or any of its subsidiaries exists or, to the knowledge of the Company, is threatened, that would, individually or in the aggregate, have a Material Adverse Effect;

(xxxvii)    Except as described in the Pricing Prospectus and the Prospectus, there are no contracts, agreements or understandings between the Company and any person that would give rise to a valid claim against the Company or any Underwriter for a brokerage commission, finder’s fee or other like payment in connection with this offering;

(xxxviii)    The offering, sale and delivery of the Shares as described in each of the Registration Statement, the Pricing Prospectus and the Prospectus will not violate Regulation T, U or X of the Board of Governors of the Federal Reserve System or any other regulation of such Board of Governors;

(xxxix)    There are no debt securities or preferred stock of, or guaranteed by, the Company that are rated by a “nationally recognized statistical rating organization,” as such term is defined in Section 3(a)(62) of the Exchange Act.

(xl)    No forward-looking statement (within the meaning of Section 27A of the Act and Section 21E of the Exchange Act) contained in the Registration Statement, the Pricing Prospectus or the Prospectus has been made or reaffirmed by the Company without a reasonable basis or has been disclosed by the Company other than in good faith;

(xli)    Each of the Company and its subsidiaries possesses all licenses, certificates, authorizations and permits issued by, and has made all declarations and filings with, the appropriate federal, state or foreign regulatory agencies or bodies which are necessary for the ownership of its properties or the conduct of its businesses as presently conducted, except where failure to have such licenses, certificates, authorizations and permits would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect. None of the Company or its subsidiaries have received notification of any revocation or modification of any such license, certificate, authorization or permit or currently intend to not renew any such license, certificate, authorization or permit which, if subject to an unfavorable decision, ruling or finding would reasonably be expected to have a Material Adverse Effect;

(xlii)    the Company and its subsidiaries own, possess or can acquire on commercially reasonable terms adequate rights to use all patents, patent applications, trademarks, service marks, trade names, trademark registrations, service mark registrations, copyrights, licenses, know-how, software, systems and technology (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures) necessary for the conduct of their businesses in the manner and subject to such qualifications described in the Pricing Prospectus and have no reason to believe that the conduct of their business will

conflict with, and the Company and its subsidiaries have not received any notice of any claim of conflict with, any such rights of others; and

(xliii)    The interactive data in eXtensible Business Reporting Language incorporated by reference in the Pricing Prospectus and the Prospectus fairly presents the information called for in all material respects and has been prepared in accordance with the Commission’s rules and guidelines applicable thereto.

(b)    Each of the Selling Stockholders severally represents and warrants to, and agrees with, each of the Underwriters and the Company that:

(i)    All consents, approvals, authorizations and orders necessary for the execution and delivery by such Selling Stockholder of this Agreement, and for the sale and delivery of the Shares to be sold by such Selling Stockholder hereunder, have been obtained; and such Selling Stockholder has full right, power and authority to enter into this Agreement, and to sell, assign, transfer and deliver the Shares to be sold by such Selling Stockholder hereunder;

(ii)    The sale of the Shares to be sold by such Selling Stockholder hereunder and the compliance by such Selling Stockholder with this Agreement and the consummation of the transactions herein contemplated will not (A) conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, any statute, indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which such Selling Stockholder is a party or by which such Selling Stockholder is bound or to which any of the property or assets of such Selling Stockholder is subject, (A) result in any violation of the provisions of the Selling Stockholders’ Organizational Documents, or (A) result in the violation of any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over such Selling Stockholder or any of its subsidiaries or any property or assets of such Selling Stockholder, except for such conflicts, breaches, violations defaults, in the case of clause (A) as would not reasonably be expected to impair in any material respect the ability of such Selling Stockholder to perform its obligations under this Agreement; and no consent, approval, authorization, order, registration or qualification of or with any such court or governmental body or agency is required for the performance by such Selling Stockholder of its obligations under this Agreement and the consummation by such Selling Stockholder of the transactions contemplated by this Agreement in connection with the Shares to be sold by such Selling Stockholder hereunder, except the registration under the Act of the Shares, and such consents, approvals, authorizations, orders, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Shares by the Underwriters;

(iii)    Such Selling Stockholder has, and immediately prior to each Time of Delivery such Selling Stockholder will have, good and valid title to the Shares to be sold by such Selling Stockholder hereunder at such Time of Delivery, free and

clear of all Liens; and, upon delivery of such Shares and payment therefor pursuant hereto, good and valid title to such Shares, free and clear of all Liens, will pass to the several Underwriters;

(iv)    On or prior to the date of the Pricing Prospectus, such Selling Stockholder has executed and delivered to the Underwriters a lock-up agreement substantially in the form of Annex II hereto;

(v)    Such Selling Stockholder has not taken and will not take, directly or indirectly, any action that is designed to or that has constituted or might reasonably be expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Shares;

(vi)    To the extent that any statements or omissions made in the Registration Statement, any Preliminary Prospectus, the Prospectus or any amendment or supplement thereto are made in reliance upon and in conformity with written information furnished to the Company by such Selling Stockholder pursuant to Items 7 and 11(m) of Form S‑1 expressly for use therein, such Registration Statement and Preliminary Prospectus did, and the Prospectus and any further amendments or supplements to the Registration Statement and the Prospectus will, when they become effective or are filed with the Commission, as the case may be, conform in all material respects to the requirements of the Act and the rules and regulations of the Commission thereunder and not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, it being understood and agreed that the only such information furnished by such Selling Stockholder consists of (A) the legal name, address and the number of shares of Common Stock owned by such Selling Stockholder and (A) the other information with respect to such Selling Stockholder (excluding percentages) which appear in the table (and corresponding footnotes) under the caption “Selling Shareholders” (with respect to each Selling Stockholder, the “Selling Stockholder Information”);

(vii)    In order to document the Underwriters’ compliance with the reporting and withholding provisions of the Tax Equity and Fiscal Responsibility Act of 1982 with respect to the transactions herein contemplated, such Selling Stockholder will deliver to you prior to or at the First Time of Delivery (as defined in Section 4 hereof) a properly completed and executed United States Treasury Department Form W‑9 (or other applicable form or statement specified by Treasury Department regulations in lieu thereof);

(viii)    Such Selling Stockholder is not prompted by any material non-public information concerning the Company or any of its subsidiaries that is not disclosed in the Pricing Prospectus to sell its Shares pursuant to this Agreement;

(ix)    Such Selling Stockholder has not, nor any of its subsidiaries nor, to the knowledge of such Selling Stockholder, any director, officer, agent, employee,

affiliate or other person associated with or acting on behalf of such Selling Stockholder or any of its subsidiaries (i) used any corporate funds for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity; (ii) made or taken an act in furtherance of an offer, promise or authorization of any direct or indirect unlawful payment to any foreign or domestic government official or employee from corporate funds, including of any government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of the foregoing, or any political party, party official or candidate for political office; (iii) violated or is in violation of any provision of the FCPA, the UK Bribery Act, any applicable law or regulation implementing the OECD Anti-Bribery Convention or any other applicable anti-bribery or anti-corruption law; or (iv) made any bribe, rebate, payoff, influence payment, kickback or other unlawful payment, or offered, agreed, requested or promised to make any such payment or taken an act in furtherance of any unlawful bribe or other unlawful benefit, including, without limitation, any rebate, payoff, influence, benefit, kickback or other unlawful or improper payment or benefit;

(x)    Such Selling Stockholder and its subsidiaries have conducted their businesses at all times in compliance with applicable financial recordkeeping and reporting requirements of the Money Laundering Laws and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving such Selling Stockholder or any of its subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Selling Stockholder, threatened;

(xi)    Such Selling Stockholder represents and warrants that it is not (1) an employee benefit plan subject to Title I of ERISA, (2) a plan or account subject to Section 4975 of the Code or (3) an entity deemed to hold “plan assets” of any such plan or account under Section 3(42) of ERISA, 29 C.F.R. 2510.3-101, or otherwise; and

(xii)    (A) Such Selling Stockholder is currently not, nor any of its subsidiaries nor, to the knowledge of such Selling Stockholder, any director, officer, agent, employee, affiliate or other person associated with or acting on behalf of such Selling Stockholder or any of its subsidiaries (i) the subject or the target of any Sanctions, (ii) located, organized or resident in any country or territory that is the subject or target of Sanctions nor does any business with or involving the government of, or any person or project located in, any country targeted by any Sanctions or (iii) supports or facilitates any such business or project; (A) such Selling Stockholder is not controlled (within the meaning of the executive orders or regulations promulgating Sanctions) by any government or person that is the subject or target of Sanctions; (A) such Selling Stockholder will not directly or indirectly use the proceeds of the offering of the Shares hereunder, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity (i) to fund or facilitate any activities of or business with any person, or in

any country or territory, that, at the time of such funding, is the subject or target of Sanctions or (ii) in any other manner that will result in a violation by any person (including any person participating in the transaction, whether as underwriter, advisor, investor or otherwise) of Sanctions; and (A) such Selling Stockholder has implemented and maintains adequate internal controls and procedures to monitor and audit transactions that are reasonably designed to detect and prevent any use of the proceeds from the offering of the Shares hereunder or any other action that is inconsistent with any of such Selling Stockholder’s representations and obligations under this paragraph. For the past five years, such Selling Stockholder and its subsidiaries have not knowingly engaged in and are not now knowingly engaged in any dealings or transactions with any person that at the time of the dealing or transaction is or was the subject or target of, or in any country or territory that is the subject or target of, Sanctions.

2.    Subject to the terms and conditions herein set forth, (a) each of the Selling Stockholders agrees, severally and not jointly, to sell to each of the Underwriters, and each of the Underwriters agrees, severally and not jointly, to purchase from each of the Selling Stockholders, at a purchase price per share of $15.07375, the number of Firm Shares (to be adjusted by you so as to eliminate fractional shares) determined by multiplying the aggregate number of Firm Shares to be sold by each of the Selling Stockholders as set forth opposite their respective names in Schedule II hereto by a fraction, the numerator of which is the aggregate number of Firm Shares to be purchased by such Underwriter as set forth opposite the name of such Underwriter in Schedule I hereto and the denominator of which is the aggregate number of Firm Shares to be purchased by all of the Underwriters from all of the Selling Stockholders hereunder and (a) in the event and to the extent that Goldman Sachs & Co. LLC shall exercise the election to purchase Optional Shares as provided below, the Selling Stockholders, as and to the extent indicated in Schedule II hereto agree, severally and not jointly, to sell to Goldman Sachs & Co. LLC, and Goldman Sachs & Co. LLC agrees to purchase from each of the Selling Stockholders, at the purchase price per share set forth in clause (a) of this Section 2, the number of Optional Shares as to which such election shall have been exercised.

The Selling Stockholders, as and to the extent indicated in Schedule II hereto, hereby grant to Goldman Sachs & Co. LLC the right to purchase at its election up to 1,800,000 Optional Shares, at the purchase price per share set forth in the paragraph above, provided that the purchase price per Optional Share shall be reduced by an amount per share equal to any dividends or distributions declared by the Company and payable on the Firm Shares but not payable on the Optional Shares. Any such election to purchase Optional Shares may be exercised only by written notice from Goldman Sachs & Co. LLC to the Selling Stockholders, given within a period of 30 calendar days after the date of this Agreement and setting forth the aggregate number of Optional Shares to be purchased and the date on which such Optional Shares are to be delivered, as determined by Goldman Sachs & Co. LLC but in no event earlier than the First Time of Delivery or, unless Goldman Sachs & Co. LLC and the Selling Stockholders otherwise agree in writing, earlier than two or later than ten business days after the date of such notice.

3.    Upon the authorization by you of the release of the Firm Shares, the several Underwriters propose to offer the Firm Shares for sale upon the terms and conditions set forth in the Prospectus.

4.    5.    The Shares to be purchased by each Underwriter hereunder, in definitive form, and in such authorized denominations and registered in such names as you may request upon at least forty-eight hours’ prior notice to the Company and the Selling Stockholders shall be delivered by or on behalf of the Selling Stockholders to you, through the facilities of the Depository Trust Company (“DTC”), for the account of such Underwriter, against payment by or on behalf of such Underwriter of the purchase price therefor by wire transfer of federal (same-day) funds to the accounts specified by the Selling Stockholders to you at least forty-eight hours in advance. The Company and the Selling Stockholders will cause the certificates representing the Shares to be made available for checking and packaging at least twenty-four hours prior to the Time of Delivery with respect thereto at the office of DTC or its designated custodian (the “Designated Office”). The time and date of such delivery and payment shall be, with respect to the Firm Shares, 9:00 a.m., New York time, on November 9, 2017 or such other time and date as you and the Selling Stockholders may agree upon in writing, and, with respect to the Optional Shares, 9:00 a.m., New York time, on the date specified by Goldman Sachs & Co. LLC in each written notice given by Goldman Sachs & Co. LLC of its election to purchase such Optional Shares, or such other time and date as Goldman Sachs & Co. LLC and the Selling Stockholders may agree upon in writing. Such time and date for delivery of the Firm Shares is herein called the “First Time of Delivery”, each such time and date for delivery of the Optional Shares, if not the First Time of Delivery, is herein called the “Second Time of Delivery”, and each such time and date for delivery is herein called a “Time of Delivery”.

(a)    The documents to be delivered at each Time of Delivery by or on behalf of the parties hereto pursuant to Section 8 hereof, including the cross receipt for the Shares and any additional documents requested by the Underwriters pursuant to Section 8(j) hereof will be delivered at the offices of Vinson & Elkins L.L.P., 1001 Fannin Street, Suite 2500, Houston, Texas 77002 (the “Closing Location”), and the Shares will be delivered at the Designated Office, all at such Time of Delivery. A meeting will be held at the Closing Location at 4 p.m., New York City time, on the New York Business Day next preceding such Time of Delivery, at which meeting the final drafts of the documents to be delivered pursuant to the preceding sentence will be available for review by the parties hereto. For the purposes of this Section 4, “New York Business Day” shall mean each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which banking institutions in New York are generally authorized or obligated by law or executive order to close.

6.    The Company agrees with each of the Underwriters:

(a)    To prepare the Prospectus in a form approved by you and to file such Prospectus pursuant to Rule 424(b) under the Act not later than the Commission’s close of business on the second business day following the execution and delivery of this Agreement, or, if applicable, such earlier time as may be required by Rule 430A(a)(3) under the Act; to make no further amendment or any supplement to the Registration Statement or the Prospectus prior to the last Time of Delivery that has been disapproved by you promptly after reasonable notice thereof; to advise you, promptly after it receives notice thereof, of

the time when any amendment to the Registration Statement has been filed or becomes effective or any amendment or supplement to the Prospectus has been filed and to furnish you with copies thereof; to file promptly all material required to be filed by the Company with the Commission pursuant to Rule 433(d) under the Act; to advise you, promptly after it receives notice thereof, of the issuance by the Commission of any stop order or of any order preventing or suspending the use of any Preliminary Prospectus or other prospectus in respect of the Shares, of the suspension of the qualification of the Shares for offering or sale in any jurisdiction, of the initiation or threatening of any proceeding for any such purpose, or of any request by the Commission for the amending or supplementing of the Registration Statement or the Prospectus or for additional information; and, in the event of the issuance of any stop order or of any order preventing or suspending the use of any Preliminary Prospectus or other prospectus or suspending any such qualification, to promptly use its best efforts to obtain the withdrawal of such order;

(b)    Promptly from time to time to take such action as you may reasonably request to qualify the Shares for offering and sale under the securities laws of such jurisdictions as you may request and to comply with such laws so as to permit the continuance of sales and dealings therein in such jurisdictions for as long as may be necessary to complete the distribution of the Shares, provided that in connection therewith the Company shall not be required to qualify as a foreign corporation or to file a general consent to service of process in any jurisdiction;

(c)    Prior to 10:00 a.m., New York City time, on the New York Business Day next succeeding the date of this Agreement and from time to time, to furnish the Underwriters with written and electronic copies of the Prospectus in New York City in such quantities as you may reasonably request, and, if the delivery of a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) is required at any time prior to the expiration of nine months after the time of issue of the Prospectus in connection with the offering or sale of the Shares and if at such time any event shall have occurred as a result of which the Prospectus as then amended or supplemented would include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made when such Prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) is delivered, not misleading, or, if for any other reason it shall be necessary during such same period to amend or supplement the Prospectus in order to comply with the Act, to notify you and upon your request to prepare and furnish without charge to each Underwriter and to any dealer in securities as many written and electronic copies as you may from time to time reasonably request of an amended Prospectus or a supplement to the Prospectus which will correct such statement or omission or effect such compliance; and in case any Underwriter is required to deliver a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the Act) in connection with sales of any of the Shares at any time nine months or more after the time of issue of the Prospectus, upon your request but at the expense of such Underwriter, to prepare and deliver to such Underwriter as many written and electronic copies as you may request of an amended or supplemented Prospectus complying with Section 10(a)(3) of the Act;

(d)    To make generally available to its securityholders as soon as practicable, but in any event not later than sixteen months after the effective date of the Registration Statement (as defined in Rule 158(c) under the Act), an earnings statement of the Company and its subsidiaries (which need not be audited) complying with Section 11(a) of the Act and the rules and regulations of the Commission thereunder (including, at the option of the Company, Rule 158 under the Act);

(e)    During the period beginning from the date hereof and continuing to and including the date 90 days after the date of the Prospectus (the “Company Lock-Up Period”), not to (i) offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise transfer or dispose of, directly or indirectly, or file with the Commission a registration statement under the Act relating to, any securities of the Company that are substantially similar to the Shares, including but not limited to any options or warrants to purchase shares of Stock or any securities that are convertible into or exchangeable for, or that represent the right to receive, Stock or any such substantially similar securities, or publicly disclose the intention to make any offer, sale, pledge, disposition or filing or (i) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of the Stock or any such other securities, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Stock or such other securities, in cash or otherwise ((other than (A) any Shares to be sold hereunder, (A) pursuant to the Company’s stock option plan existing on, or upon the conversion or exchange of convertible or exchangeable securities outstanding as of, the date of this Agreement, (A) the issuance by the Company of Stock or securities convertible into, exchangeable for or representing the right to receive Stock in connection with the acquisition by the Company or any of its subsidiaries of the securities, business, technology, property or other assets of another person or entity or pursuant to an employee benefit plan assumed by the Company in connection with any such acquisition or (A) the filing of any registration statement on Form S‑8 relating to securities granted or to be granted pursuant to the Company’s equity incentive plans that are described in the Pricing Prospectus or any assumed employee benefit plan contemplated by clause (C); provided that the aggregate number of shares of Stock that the Company may sell or issue or agree to sell or issue pursuant to clause (C) shall not exceed 10% of the total number of shares of Stock of the Company outstanding immediately following the completion of the transactions contemplated by this Agreement; and, provided, further, that in the case of clause (C) each recipient of such securities shall execute and deliver to the Representative, on or prior to the issuance of such securities, a lock-up agreement substantially to the effect as set forth in Annex II hereto)), in each case, without the prior written consent of Goldman Sachs & Co. LLC;

(f)    To furnish to its stockholders as soon as practicable after the end of each fiscal year an annual report (including a balance sheet and statements of income, stockholders’ equity and cash flows of the Company and its consolidated subsidiaries certified by independent public accountants) and, as soon as practicable after the end of each of the first three quarters of each fiscal year (beginning with the fiscal quarter ending after the effective date of the Registration Statement), to make available to its stockholders

consolidated summary financial information of the Company and its subsidiaries for such quarter in reasonable detail;

(g)    During a period of three years from the effective date of the Registration Statement, to furnish to you copies of all reports or other communications (financial or other) furnished to stockholders, and to deliver to you (i) as soon as they are available, copies of any reports and financial statements furnished to or filed with the Commission or any national securities exchange on which any class of securities of the Company is listed; and (i) such additional information concerning the business and financial condition of the Company as you may from time to time reasonably request (such financial statements to be on a consolidated basis to the extent the accounts of the Company and its subsidiaries are consolidated in reports furnished to its stockholders generally or to the Commission);

(h)    To file with the Commission such information on Form 10‑Q or Form 10‑K as may be required by Rule 463 under the Act;

(i)    If the Company elects to rely upon Rule 462(b) under the Act (“Rule 462(b)”), the Company shall file a Rule 462(b) Registration Statement with the Commission in compliance with Rule 462(b) by 10:00 p.m., Washington, D.C. time, on the date of this Agreement, and the Company shall at the time of filing either pay to the Commission the filing fee for the Rule 462(b) Registration Statement or give irrevocable instructions for the payment of such fee pursuant to Rule 3a(c) of the Commission’s Informal and Other Procedures (16 CFR 202.3a);

(j)    Upon request of any Underwriter, to furnish, or cause to be furnished, to such Underwriter an electronic version of the Company’s trademarks, servicemarks and corporate logo for use on the website, if any, operated by such Underwriter for the purpose of facilitating the on-line offering of the Shares (the “License”); provided, however, that the License shall be used solely for the purpose described above, is granted without any fee and may not be assigned or transferred; and

(k)    To promptly notify you if the Company ceases to be an Emerging Growth Company at any time prior to the later of (i) completion of the distribution of the Shares within the meaning of the Act and (i) completion of the 90-day restricted period referred to in Section 5(e) hereof.

7.    (a)    The Company represents and agrees that, without the prior consent of the Representative, it has not made and will not make any offer relating to the Shares that would constitute a “free writing prospectus” as defined in Rule 405 under the Act; each Selling Stockholder represents and agrees that, without the prior consent of the Company and the Representative, it has not made and will not make any offer relating to the Shares that would constitute a “free writing prospectus”; and each Underwriter represents and agrees that, without the prior consent of the Company and the Representative, it has not made and will not make any offer relating to the Shares that would constitute a “free writing prospectus”; any such free writing prospectus the use of which has been consented to by the Company and the Representative is listed on Schedule III(a) hereto;

(a)    The Company represents and agrees that (i) it has not engaged in, or authorized any other person to engage in, any Section 5(d) Communications, other than Section 5(d) Communications with the prior consent of the Representative with entities that are qualified institutional buyers as defined in Rule 144A under the Act or institutions that are accredited investors as defined in Rule 501(a) under the Act; and (i) it has not distributed, or authorized any other person to distribute, any Section 5(d) Communications that are written communications within the meaning of Rule 405 under the Act (“Section 5(d) Writings”), other than those distributed with the prior consent of the Representative that are listed on Schedule III(b) hereto; and the Company reconfirms that the Underwriters have been authorized to act on its behalf in engaging in Section 5(d) Communications;

(b)    The Company has complied and will comply with the requirements of Rule 433 under the Act applicable to any Issuer Free Writing Prospectus, including timely filing with the Commission or retention where required and legending; and the Company represents that it has satisfied and agrees that it will satisfy the conditions under Rule 433 under the Act to avoid a requirement to file with the Commission any electronic road show;

(c)    The Company agrees that if at any time following issuance of an Issuer Free Writing Prospectus or Section 5(d) Writing any event occurred or occurs as a result of which such Issuer Free Writing Prospectus or Section 5(d) Writing would conflict with the information in the Registration Statement, the Pricing Prospectus or the Prospectus or would include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances then prevailing, not misleading, the Company will give prompt notice thereof to the Representative and, if requested by the Representative, will prepare and furnish without charge to each Underwriter an Issuer Free Writing Prospectus, Section 5(d) Writing or other document which will correct such conflict, statement or omission; provided, however, that this representation and warranty shall not apply to any statements or omissions in an Issuer Free Writing Prospectus made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through the Representative expressly for use therein.

8.    The Company and each of the Selling Stockholders covenant and agree with one another and with the several Underwriters that (a) the Company will pay or cause to be paid the following: (i) the fees, disbursements and expenses of the Company’s counsel and accountants in connection with the registration of the Shares under the Act and all other expenses in connection with the preparation, printing, reproduction and filing of the Registration Statement, any Preliminary Prospectus, any Issuer Free Writing Prospectus and the Prospectus and amendments and supplements thereto and the mailing and delivering of copies thereof to the Underwriters and dealers; (i) the cost of printing or producing any agreement among Underwriters, this Agreement, the Blue Sky Memorandum, closing documents (including any compilations thereof) and any other documents in connection with the offering, purchase, sale and delivery of the Shares; (i) all expenses in connection with the qualification of the Shares for offering and sale under state securities laws as provided in Section 5(b) hereof, including the fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky survey; (i) all fees and expenses in connection with any listing of the Shares on the New York Stock Exchange (the “Exchange”); and (i) the filing fees incident to, and the fees and disbursements of counsel for

the Underwriters in connection with, any required review by the Financial Industry Regulatory Authority (“FINRA”) of the terms of the sale of the Shares (up to $20,000); (a) the Company will pay or cause to be paid: (i) the cost of preparing stock certificates; if applicable, (i) the cost and charges of any transfer agent or registrar, and (i) all other costs and expenses incident to the performance of its obligations hereunder which are not otherwise specifically provided for in this Section; and (a) such Selling Stockholder will pay or cause to be paid all costs and expenses incident to the performance of such Selling Stockholder’s obligations hereunder which are not otherwise specifically provided for in this Section, including (i) any fees and expenses of counsel for such Selling Stockholder, and (i) all expenses and taxes incident to the sale and delivery of the Shares to be sold by such Selling Stockholder to the Underwriters hereunder. In connection with clause (c)(ii) of the preceding sentence, Goldman Sachs & Co. LLC agrees to pay New York State stock transfer tax, and the Selling Stockholder agrees to reimburse Goldman Sachs & Co. LLC for associated carrying costs if such tax payment is not rebated on the day of payment and for any portion of such tax payment not rebated. It is understood, however, that the Company shall bear, and the Selling Stockholders shall not be required to pay or to reimburse the Company for, the cost of any other matters not directly relating to the sale and purchase of the Shares pursuant to this Agreement, and that, except as provided in this Section, and Sections 9 and 12 hereof, the Underwriters will pay all of their own costs and expenses, including the fees of their counsel, stock transfer taxes on resale of any of the Shares by them, and any advertising expenses connected with any offers they may make and that the Underwriters shall be responsible for 50% of the cost of any chartered plane, jet, private aircraft, other aircraft or other transportation chartered in connection with any “road show” presentation to investors undertaken in connection with the offering.

9.    The obligations of the Underwriters hereunder, as to the Shares to be delivered at each Time of Delivery, shall be subject, in their discretion, to the condition that all representations and warranties and other statements of the Company and the Selling Stockholders herein are, at and as of such Time of Delivery, true and correct, the condition that the Company and the Selling Stockholders shall have performed all of its and their obligations hereunder theretofore to be performed, and the following additional conditions:

(a)    The Prospectus shall have been filed with the Commission pursuant to Rule 424(b) under the Act within the applicable time period prescribed for such filing by the rules and regulations under the Act and in accordance with Section 5(a) hereof; all material required to be filed by the Company pursuant to Rule 433(d) under the Act shall have been filed with the Commission within the applicable time period prescribed for such filing by Rule 433 under the Act; if the Company has elected to rely upon Rule 462(b) under the Act, the Rule 462(b) Registration Statement shall have become effective by 10:00 p.m., Washington, D.C. time, on the date of this Agreement; no stop order suspending the effectiveness of the Registration Statement or any part thereof shall have been issued and no proceeding for that purpose shall have been initiated or threatened by the Commission no stop order suspending or preventing the use of the Prospectus or any Issuer Free Writing Prospectus shall have been initiated or threatened by the Commission; and all requests for additional information on the part of the Commission shall have been complied with to your reasonable satisfaction;

(b)    Vinson & Elkins L.L.P., counsel for the Underwriters, shall have furnished to you such written opinion or opinions (a form of such opinion is attached as Annex I(a) hereto), dated such Time of Delivery, in form and substance satisfactory to you, with respect to the matters as you may reasonably request, and such counsel shall have received such papers and information as they may reasonably request to enable them to pass upon such matters;

(c)    Latham & Watkins LLP, counsel for the Company, shall have furnished to you their written opinion, substantially in the form attached as Annex I(b) hereto, dated such Time of Delivery;

(d)    The respective counsel for each of the Selling Stockholders, as indicated in Schedule II hereto, each shall have furnished to you their written opinion with respect to each of the Selling Stockholders for whom they are acting as counsel, substantially in the form attached as Annex I(c) hereto, dated such Time of Delivery;

(e)    On the date of the Prospectus at a time prior to the execution of this Agreement, at 9:30 a.m., New York City time, on the effective date of any post-effective amendment to the Registration Statement filed subsequent to the date of this Agreement and also at each Time of Delivery, Deloitte shall have furnished to you a letter or letters, dated the respective dates of delivery thereof, in form and substance satisfactory to you;

(f)    (i) Neither the Company nor any of its subsidiaries shall have sustained since the date of the latest audited financial statements included in the Pricing Prospectus any loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, otherwise than as set forth or contemplated in the Pricing Prospectus, and (i) since the respective dates as of which information is given in the Pricing Prospectus there shall not have been any change in the capital stock or long-term debt of the Company or any of its subsidiaries or any change or any development involving a prospective change, in or affecting the general affairs, management, financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, otherwise than as set forth or contemplated in the Pricing Prospectus, the effect of which, in any such case described in clause (i) or (ii), is in your judgment so material and adverse as to make it impracticable or inadvisable to proceed with the public offering or the delivery of the Shares being delivered at such Time of Delivery on the terms and in the manner contemplated in the Pricing Prospectus;

(g)    On or after the Applicable Time there shall not have occurred any of the following: (i) a suspension or material limitation in trading in securities generally on the Exchange; (i) a suspension or material limitation in trading in the Company’s securities on the Exchange; (i) a general moratorium on commercial banking activities declared by either federal or New York or Texas State authorities or a material disruption in commercial banking or securities settlement or clearance services in the United States; (i) the outbreak or escalation of hostilities involving the United States or the declaration by the United States of a national emergency or war; or (i) the occurrence of any other calamity or crisis or any change in financial, political or economic conditions in the United States or elsewhere, if

the effect of any such event specified in clause (iv) or (v) in your judgment makes it impracticable or inadvisable to proceed with the public offering or the delivery of the Shares being delivered at such Time of Delivery on the terms and in the manner contemplated in the Prospectus;

(h)    The Company shall have obtained and delivered to the Underwriters executed copies of an agreement from each officer, director and stockholder of the Company listed on Schedule IV hereto, substantially to the effect set forth in Annex II hereto in form and substance satisfactory to you;

(i)    The Company shall have complied with the provisions of Section 5(c) hereof with respect to the furnishing of prospectuses on the New York Business Day next succeeding the date of this Agreement; and

(j)    The Company and the Selling Stockholders shall have furnished or caused to be furnished to you at such Time of Delivery certificates of officers of the Company and of the Selling Stockholders, respectively, satisfactory to you as to the accuracy of the representations and warranties of the Company and the Selling Stockholders, respectively, herein at and as of such Time of Delivery, as to the performance by the Company and the Selling Stockholders of all of their respective obligations hereunder to be performed at or prior to such Time of Delivery, as to such other matters as you may reasonably request, and the Company shall have furnished or caused to be furnished certificates as to the matters set forth in subsections (a) and (f) of this Section 8.

10.    (a)    The Company will indemnify and hold harmless each Underwriter against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus, any “issuer information” filed or required to be filed pursuant to Rule 433(d) under the Act, or any Section 5(d) Writing, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such action or claim as such expenses are incurred; provided, however, that the Company shall not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus, or any Section 5(d) Writing, in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representative expressly for use therein, it being understood and agreed that the only such information consists of the following: the information contained in the ninth, tenth and eleventh paragraphs under the caption “Underwriting” in the Preliminary Prospectus.

(a)    Each of the Selling Stockholders will, severally and not jointly, indemnify and hold harmless each Underwriter against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto or any Issuer Free Writing Prospectus in reliance upon and in conformity with written information furnished to the Company by such Selling Stockholder expressly for use therein, it being understood and agreed that the only such information furnished by any Selling Stockholder consists of the following information: each Selling Stockholder’s name and corresponding share amounts set forth in the table of Selling Shareholders in the Registration Statement and Final Prospectus under the heading “Selling Shareholders” and each Selling Stockholder’s address; and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such action or claim as such expenses are incurred; provided, however, that such Selling Stockholder shall not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus or any amendment or supplement thereto, any Issuer Free Writing Prospectus, or any Section 5(d) Writing, in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representative expressly for use therein. The aggregate liability of each Selling Stockholder under this subsection (b) shall be limited to an amount equal to the aggregate gross proceeds from the offering of such Selling Stockholder’s Shares purchased under this Agreement.

(b)    Each Underwriter will indemnify and hold harmless the Company and each Selling Stockholder against any losses, claims, damages or liabilities to which the Company or such Selling Stockholder may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus, or any Section 5(d) Writing, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus, or any Section 5(d) Writing, in reliance upon and in conformity with written information furnished to the Company by such Underwriter through the Representative expressly for use therein, it being understood and agreed that the only such information consists of the following: the information

contained in the ninth, tenth and eleventh paragraphs under the caption “Underwriting” in the Preliminary Prospectus, and will reimburse the Company and each Selling Stockholder for any legal or other expenses reasonably incurred by the Company or such Selling Stockholder in connection with investigating or defending any such action or claim as such expenses are incurred.

(c)    Promptly after receipt by an indemnified party under subsection (a), (b) or (c) of this Section 9 of notice of the commencement of any action, such indemnified party shall, if a claim in respect thereof is to be made against the indemnifying party under such subsection, notify the indemnifying party in writing of the commencement thereof; but the omission so to notify the indemnifying party shall not relieve it from any liability which it may have to any indemnified party otherwise than under such subsection. In case any such action shall be brought against any indemnified party and it shall notify the indemnifying party of the commencement thereof, the indemnifying party shall be entitled to participate therein and, to the extent that it shall wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party), and, after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof, the indemnifying party shall not be liable to such indemnified party under such subsection for any legal expenses of other counsel or any other expenses, in each case subsequently incurred by such indemnified party, in connection with the defense thereof other than reasonable costs of investigation. No indemnifying party shall, without the written consent of the indemnified party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification or contribution may be sought hereunder (whether or not the indemnified party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (i) includes an unconditional release of the indemnified party from all liability arising out of such action or claim and (i) does not include a statement as to or an admission of fault, culpability or a failure to act, by or on behalf of any indemnified party.

(d)    If the indemnification provided for in this Section 9 is unavailable to or insufficient to hold harmless an indemnified party under subsection (a), (b) or (c) above in respect of any losses, claims, damages or liabilities (or actions in respect thereof) referred to therein, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (or actions in respect thereof) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Selling Stockholders on the one hand and the Underwriters on the other from the offering of the Shares. If, however, the allocation provided by the immediately preceding sentence is not permitted by applicable law or if the indemnified party failed to give the notice required under subsection (d) above, then each indemnifying party shall contribute to such amount paid or payable by such indemnified party in such proportion as is appropriate to reflect not only such relative benefits but also the relative fault of the Company and the Selling Stockholders on the one hand and the Underwriters on the other in connection with the statements or omissions which resulted in such losses, claims, damages or liabilities (or actions in respect thereof), as well as any other relevant equitable considerations. The relative benefits received by the Company and the Selling Stockholders on the one hand and the Underwriters on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the

Company and the Selling Stockholders bear to the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover page of the Prospectus. The relative fault 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 the Selling Stockholders on the one hand or the Underwriters on the other and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. Notwithstanding the provisions of this subsection (e), the requirement of each Selling Stockholder to contribute pursuant to this paragraph shall be limited to an amount equal to the Net Proceeds received by such Selling Stockholder less any amounts that such Selling Stockholder is obligated to pay under paragraph (b) above. The Company, each of the Selling Stockholders and the Underwriters agree that it would not be just and equitable if contribution pursuant to this subsection (d) were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this subsection (e). The amount paid or payable by an indemnified party as a result of the losses, claims, damages or liabilities (or actions in respect thereof) referred to above in this subsection (e) shall be deemed to include 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 subsection (e), no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations in this subsection (e) to contribute are several in proportion to their respective underwriting obligations and not joint.

(e)    The obligations of the Company and the Selling Stockholders under this Section 9 shall be in addition to any liability which the Company and the Selling Stockholders may otherwise have and shall extend, upon the same terms and conditions, to each officer and director of each Underwriter and each person, if any, who controls any Underwriter within the meaning of the Act and each broker-dealer affiliate of any Underwriter; and the obligations of the Underwriters under this Section 9 shall be in addition to any liability which the respective Underwriters may otherwise have and shall extend, upon the same terms and conditions, to each officer and director of the Company (including any person who, with his or her consent, is named in the Registration Statement as about to become a director of the Company) and to each person, if any, who controls the Company or any Selling Stockholder within the meaning of the Act.

11.    (a)    If any Underwriter shall default in its obligation to purchase the Shares that it has agreed to purchase hereunder at a Time of Delivery, you may in your discretion arrange for you or another party or other parties to purchase such Shares on the terms contained herein. If within thirty-six hours after such default by any Underwriter you do not arrange for the purchase of such Shares, then the Selling Stockholders shall be entitled to a further period of thirty-six hours within which to procure another party or other parties satisfactory to you to purchase such Shares on such terms. In the event that, within the respective prescribed periods, you notify the Selling Stockholders

that you have so arranged for the purchase of such Shares, or a Selling Stockholder notifies you that it has so arranged for the purchase of such Shares, you or the Selling Stockholders shall have the right to postpone (such) Time of Delivery for a period of not more than seven days, in order to effect whatever changes may thereby be made necessary in the Registration Statement or the Prospectus, or in any other documents or arrangements, and the Company agrees to file promptly any amendments or supplements to the Registration Statement or the Prospectus which in your opinion may thereby be made necessary. The term “Underwriter” as used in this Agreement shall include any person substituted under this Section with like effect as if such person had originally been a party to this Agreement with respect to such Shares.

(a)    If, after giving effect to any arrangements for the purchase of the Shares of a defaulting Underwriter or Underwriters by you and the Selling Stockholders as provided in subsection (a) above, the aggregate number of such Shares which remains unpurchased does not exceed one-eleventh of the aggregate number of all the Shares to be purchased at such Time of Delivery, then the Selling Stockholders shall have the right to require each non-defaulting Underwriter to purchase the number of Shares which such Underwriter agreed to purchase hereunder at such Time of Delivery and, in addition, to require each non-defaulting Underwriter to purchase its pro rata share (based on the number of Shares which such Underwriter agreed to purchase hereunder) of the Shares of such defaulting Underwriter or Underwriters for which such arrangements have not been made; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

(b)    If, after giving effect to any arrangements for the purchase of the Shares of a defaulting Underwriter or Underwriters by you and the Selling Stockholders as provided in subsection (a) above, the aggregate number of such Shares which remains unpurchased exceeds one-eleventh of the aggregate number of all of the Shares to be purchased at such Time of Delivery, or if the Selling Stockholders shall not exercise the right described in subsection (b) above to require non-defaulting Underwriters to purchase Shares of a defaulting Underwriter or Underwriters, then this Agreement (or, with respect to a Second Time of Delivery, the obligations of Goldman Sachs & Co. LLC to purchase and of the Selling Stockholders to sell the Optional Shares) shall thereupon terminate, without liability on the part of any non-defaulting Underwriter or the Selling Stockholders, except for the expenses to be borne by the Selling Stockholders and the Underwriters as provided in Section 7 hereof and the indemnity and contribution agreements in Section 9 hereof; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

12.    The respective indemnities, agreements, representations, warranties and other statements of the Company, the Selling Stockholders and the several Underwriters, as set forth in this Agreement or made by or on behalf of them, respectively, pursuant to this Agreement, shall remain in full force and effect, regardless of any investigation (or any statement as to the results thereof) made by or on behalf of any Underwriter or any controlling person of any Underwriter, or the Company, or any of the Selling Stockholders, or any officer or director or controlling person of the Company, or any controlling person of any Selling Stockholder, and shall survive delivery of and payment for the Shares.

13.    If this Agreement shall be terminated pursuant to Section 10 hereof, neither the Company nor the Selling Stockholders shall then be under any liability to any Underwriter except as provided in Sections 7 and 9 hereof; but, if for any other reason any Shares are not delivered by or on behalf of the Company and the Selling Stockholders as provided herein, the Company and each of the Selling Stockholders pro rata (based on the number of Shares to be sold by the Company and such Selling Stockholder hereunder) will reimburse the Underwriters through you for all out-of-pocket expenses approved in writing by you, including fees and disbursements of counsel, reasonably incurred by the Underwriters in making preparations for the purchase, sale and delivery of the Shares not so delivered, but the Company and the Selling Stockholders shall then be under no further liability to any Underwriter except as provided in Sections 7 and 9 hereof.

14.    In all dealings hereunder, you shall act on behalf of each of the Underwriters, and the parties hereto shall be entitled to act and rely upon any statement, request, notice or agreement on behalf of any Underwriter made or given by you as the Representative; and in all dealings with any Selling Stockholder hereunder, you and the Company shall be entitled to act and rely upon any statement, request, notice or agreement on behalf of such Selling Stockholder made or given by any or all of the Attorneys-in-Fact for such Selling Stockholder.

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

All statements, requests, notices and agreements hereunder shall be in writing, and if to the Underwriters shall be delivered or sent by mail, telex or facsimile transmission to Goldman Sachs & Co. LLC, 200 West Street, New York, New York 10282, Attention: Registration Department; if to any Selling Stockholder shall be delivered or sent by mail, telex or facsimile transmission to counsel for such Selling Stockholder at its address set forth in Schedule IV hereto; if to the Company shall be delivered or sent by mail, telex or facsimile transmission to the address of the Company set forth on the cover of the Registration Statement, Attention: Secretary; and if to any stockholder that has delivered a lockup letter described in Section 8(h) hereof shall be delivered or sent by mail to his or her respective address provided in Schedule IV hereto or such other address as such stockholder provides in writing to the Company; provided, however, that any notice to an Underwriter pursuant to Section 9(d) hereof shall be delivered or sent by mail, telex or facsimile transmission to such Underwriter at its address set forth in its Underwriters’ Questionnaire or telex constituting such Questionnaire, which address will be supplied to the Company or the Selling Stockholders by you on request; provided further that notices under subsection 5(e) shall be in writing, and if to the Underwriters shall be delivered or sent by mail, telex or facsimile transmission to you as the representative at Goldman Sachs & Co. LLC, 200 West Street, New York, New York 10282, Attention: Control Room. Any such statements, requests, notices or agreements shall take effect upon receipt thereof.

15.    This Agreement shall be binding upon, and inure solely to the benefit of, the Underwriters, the Company and the Selling Stockholders and, to the extent provided in Sections 9 and 11 hereof, the officers and directors of the Company and each person who controls the Company, any Selling Stockholder or any Underwriter, and their respective heirs, executors, administrators, successors and assigns, and no other person shall acquire or have any right under or by virtue of this Agreement. No purchaser of any of the Shares from any Underwriter shall be deemed a successor or assign by reason merely of such purchase.

16.    Time shall be of the essence of this Agreement. As used herein, the term “business day” shall mean any day when the Commission’s office in Washington, D.C. is open for business.

17.    The Company and the Selling Stockholders acknowledge and agree that (i) the purchase and sale of the Shares pursuant to this Agreement is an arm’s-length commercial transaction between the Company and the Selling Stockholders, on the one hand, and the several Underwriters, on the other, (i) in connection therewith and with the process leading to such transaction each Underwriter is acting solely as a principal and not the agent or fiduciary of the Company or any Selling Stockholder, (i) no Underwriter has assumed an advisory or fiduciary responsibility in favor of the Company or any Selling Stockholder with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company or any Selling Stockholder on other matters) or any other obligation to the Company or any Selling Stockholder except the obligations expressly set forth in this Agreement, and (i) the Company and each Selling Stockholder has consulted its own legal and financial advisors to the extent it deemed appropriate. The Company and each Selling Stockholder agrees that it will not claim that the Underwriters, or any of them, has rendered advisory services of any nature or respect, or owes a fiduciary or similar duty to the Company or any Selling Stockholder, in connection with such transaction or the process leading thereto.

18.    This Agreement supersedes all prior agreements and understandings (whether written or oral) between the Company, the Selling Stockholders and the Underwriters, or any of them, with respect to the subject matter hereof.

19.    THIS AGREEMENT AND ANY MATTERS RELATED TO THIS TRANSACTION SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS THAT WOULD RESULT IN THE APPLICATION OF ANY LAW OTHER THAN THE LAWS OF THE STATE OF NEW YORK. The Company agrees that any suit or proceeding arising in respect of this agreement or our engagement will be tried exclusively in the U.S. District Court for the Southern District of New York or, if that court does not have subject matter jurisdiction, in any state court located in The City and County of New York, Borough of Manhattan, and the Company agrees to submit to the jurisdiction of, and to venue in, such courts.

20.    The Company, each Selling Stockholder and each of the Underwriters hereby irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to this Agreement or the transactions contemplated hereby.

21.    This Agreement may be executed by any one or more of the parties hereto in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same instrument.

22.    Notwithstanding anything herein to the contrary, the Company and the Selling Stockholders are authorized to disclose to any persons the U.S. federal and state income tax treatment and tax structure of the potential transaction and all materials of any kind (including tax opinions and other tax analyses) provided to the Company and the Selling Stockholders relating to that treatment and structure, without the Underwriters imposing any limitation of any kind. However, any information relating to the tax treatment and tax structure shall remain confidential (and the foregoing sentence shall not apply) to the extent necessary to enable any person to comply with securities laws. For this purpose, “tax structure” is limited to any facts that may be relevant to that treatment.

If the foregoing is in accordance with your understanding, please sign and return to us one for the Company and the Representative plus one for each counsel and the Selling Stockholders counterparts hereof, and upon the acceptance hereof by you, on behalf of each of the Underwriters, this letter and such acceptance hereof shall constitute a binding agreement among each of the Underwriters, the Company and each of the Selling Stockholders. It is understood that your acceptance of this letter on behalf of each of the Underwriters is pursuant to the authority set forth in a form of agreement among Underwriters, the form of which shall be submitted to the Company and the Selling Stockholders for examination, upon request, but without warranty on your part as to the authority of the signers thereof.

Any person executing and delivering this Agreement as Attorney-in-Fact for a Selling Stockholder represents by so doing that he has been duly appointed as Attorney-in-Fact by such Selling Stockholder pursuant to a validly existing and binding Power of Attorney that authorizes such Attorney-in-Fact to take such action.

On behalf of each of the Underwriters

Roadshow presentation dated November 2, 2017

None

The public offering price per share for the Shares is $15.50.

The number of Shares purchased by the Underwriters is 12,000,000.

their face to be appropriately responsive in all material respects to the applicable form requirements for registration statements on Form S-1 under the Act and the rules and regulations of the Commission thereunder; it being understood, however, that we express no view with respect to Regulation S‑T or the financial statements, schedules, or other financial data, included in or omitted from, the Registration Statement or the Prospectus. For purposes of this paragraph, we have assumed that the statements made in the Registration Statement and the Prospectus are correct and complete.

The primary purpose of our professional engagement was not to establish or confirm factual matters or financial or quantitative information. Therefore, we are not passing upon and do not assume any responsibility for the accuracy, completeness or fairness of the statements contained in the Registration Statement, the Preliminary Prospectus, the Pricing Information Annex or the Prospectus (except to the extent expressly set forth in numbered paragraph 8 of our letter to you of even date) and in our letter to you of even date with respect to certain tax matters, and have not made an independent check or verification thereof (except as aforesaid). However, in the course of acting as special counsel to the Company in connection with the preparation by the Company of the Registration Statement, the Preliminary Prospectus, the Pricing Information Annex and the Prospectus, we reviewed the Registration Statement, the Preliminary Prospectus, the Pricing Information Annex and the Prospectus, and participated in conferences and telephone conversations with officers and other representatives of the Company, the independent public accountants for the Company, your representatives and your counsel, during which conferences and conversations the contents of the Registration Statement, the Preliminary Prospectus, the Pricing Information Annex and the Prospectus and related matters were discussed. We also reviewed and relied upon certain corporate records and documents, letters from counsel and accountants, and oral and written statements of officers and other representatives of the Company and others as to the existence and consequence of certain factual and other matters.

Based on our participation, review and reliance as described above, we advise you that no facts came to our attention that caused us to believe that:

fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; or

it being understood that we express no belief with respect to the financial statements and supporting schedules or other financial data included in, or omitted from, the Registration Statement, the Preliminary Prospectus, the Pricing Information Annex or the Prospectus.

1.Each of the Selling Stockholders is a partnership under the DRULPA. With your consent, based solely on certificates from public officials, we confirm that each of the Selling Stockholders is validly existing and in good standing under the laws of the State of Delaware.

2.The Underwriting Agreement has been duly executed and delivered by and, with respect to the Selling Stockholders that are not natural persons, has been duly authorized by all necessary organizational action of, the Selling Stockholders.

3.The execution and delivery of the Underwriting Agreement by the Selling Stockholders and the sale of the Shares to be sold by the Selling Stockholders to you and the other Underwriters pursuant to the Underwriting Agreement do not on the date hereof:

Upon indication by book entry that the Shares to be sold by the Selling Stockholders and listed on Schedule II to the Underwriting Agreement have been credited to a securities account maintained by you, as representative of the several Underwriters, at the Depository Trust Company and payment therefor in accordance with the Underwriting Agreement, you, as representative of the several Underwriters, will acquire a security entitlement on behalf of the several Underwriters with respect to such Shares and, under the New York Uniform Commercial Code (“UCC”), an action based on an adverse claim to the Shares, whether framed in conversion, replevin, constructive trust, equitable lien or other theory may not be asserted against you, as representative of the several Underwriters, with respect to such security entitlement.

Goldman Sachs & Co. LLC

As representative of the several Underwriters named in Schedule I hereto,

c/o Goldman Sachs & Co. LLC

200 West Street

New York, NY 10282-2198

Re: ProPetro Holding Corp. - Lock-Up Agreement

Ladies and Gentlemen:

The undersigned understands that you, as representative (the “Representative”), propose to enter into an Underwriting Agreement on behalf of the several Underwriters named in Schedule I to such agreement (collectively, the “Underwriters”), with ProPetro Holding Corp., a Delaware corporation (the “Company”), and certain selling stockholders named in Schedule II to such agreement (the “Selling Stockholders”), providing for a public offering of common stock, par value $0.001 per share (the “Stock”) of the Company (the “Shares”) pursuant to a Registration Statement on Form S-1 (the “Registration Statement”) to be filed with the Securities and Exchange Commission (the “SEC”).

In consideration of the agreement by the Underwriters to offer and sell the Shares, and of other good and valuable consideration the receipt and sufficiency of which is hereby acknowledged, the undersigned agrees that, during the period specified in the following paragraph (the “Stockholder Lock-Up Period”), the undersigned will not offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of any shares of Stock of the Company, or any options or warrants to purchase any shares of Stock of the Company, or any securities convertible into, exchangeable for or that represent the right to receive shares of Stock of the Company, whether now owned or hereinafter acquired, owned directly by the undersigned (including holding as a custodian) or with respect to which the undersigned has beneficial ownership within the rules and regulations of the SEC (collectively the “Undersigned's Shares”). The foregoing restriction is expressly agreed to preclude the undersigned from engaging in any hedging or other transaction which is designed to or which reasonably could be expected to lead to or result in a sale or disposition of the Undersigned’s Shares even if such Shares would be disposed of by someone other than

the undersigned. Such prohibited hedging or other transactions would include without limitation any short sale or any purchase, sale or grant of any right (including without limitation any put or call option) with respect to any of the Undersigned’s Shares or with respect to any security that includes, relates to, or derives any significant part of its value from such Shares.

The Stockholder Lock-Up Period will commence on the date of this Lock-Up Agreement and continue for 90 days after the public offering date set forth on the final prospectus used to sell the Shares pursuant to the Underwriting Agreement.

Notwithstanding the foregoing, the undersigned may transfer the Undersigned’s Shares (i) pursuant to the terms of the Underwriting Agreement, (ii) as a bona fide gift or gifts, provided that the donee or donees thereof agree to be bound in writing by the restrictions set forth herein, (iii) by will or by intestacy, provided that such transferee or transferees thereof agree to be bound in writing by the restrictions set forth herein, (iv) to any trust for the direct or indirect benefit of the undersigned or the immediate family of the undersigned, provided that the trustee of the trust agrees to be bound in writing by the restrictions set forth herein, and provided further that any such transfer shall not involve a disposition for value, (v) for bona fide tax planning purposes, provided that the transferee or transferees agree to be bound in writing by the restrictions set forth herein, (vi) to the undersigned’s direct or indirect affiliates (as defined in Rule 12b-2 of the Securities and Exchange Act of 1934, as amended), including without limitation its direct and indirect stockholders, members, and partners and its direct and indirect subsidiaries, or to any investment fund or other entity controlled or managed by, or under the common control or management with, the undersigned, provided that such affiliate, partner, former partner, member, former member, investment fund or other entity controlled or managed by, or under the common control or management with, the undersigned agrees to be bound in writing by the restrictions set forth herein, or (vii) with the prior written consent of the Representative on behalf of the Underwriters. For purposes of this Lock-Up Agreement, “immediate family” shall mean any relationship by blood, marriage or adoption, not more remote than first cousin. In addition, notwithstanding the foregoing, if the undersigned is a corporation, the corporation may transfer the capital stock of the Company to any wholly-owned subsidiary of such corporation; provided, however, that in any such case, it shall be a condition to the transfer that the transferee execute an agreement stating that the transferee is receiving and holding such capital stock subject to the provisions of this Agreement and there shall be no further transfer of such capital stock except in accordance with this Agreement, and provided further that any such transfer shall not involve a disposition for value. The undersigned now has, and, except as contemplated by clause (i), (ii), (iii), (iv), (v), (vi) or (vii) above, for the duration of this Lock-Up Agreement will have, good and marketable title to the Undersigned’s Shares, free and clear of all liens, encumbrances, and claims whatsoever. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the Undersigned’s Shares except in compliance with the foregoing restrictions. [Add for management: Additionally, the restrictions under this agreement shall not prohibit the sale or disposition of Common Stock to satisfy tax withholding and other obligations in connection with the exercise of stock options awarded under the Long Term Incentive Plan].

The undersigned understands that the Company and the Underwriters are relying upon this Lock-Up Agreement in proceeding toward consummation of the offering. The undersigned further understands that this Lock-Up Agreement is irrevocable and shall be binding upon the undersigned’s heirs, legal representatives, successors, and assigns.