SemGroup Corporation 7,500,000 of Class A Common Stock UNDERWRITING AGREEMENT

Exhibit 1.1

SemGroup Corporation

7,500,000 of Class A Common Stock

UNDERWRITING AGREEMENT

June 16, 2016

BARCLAYS CAPITAL INC.

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Ladies and Gentlemen:

SemGroup Corporation, a Delaware corporation (the “Company”), proposes to sell to Barclays Capital Inc. (the “Underwriter”) 7,500,000 shares (the “Firm Shares”) of the Company’s Class A Common Stock, par value $0.01 per share (the “Common Stock”). In addition, the Company proposes to grant the Underwriter an option to purchase up to 1,125,000 additional shares of the Common Stock on the terms set forth in Section 2 (the “Option Shares”). The Firm Shares and the Option Shares, if purchased, are hereinafter collectively called the “Shares.” This Agreement is to confirm the agreement concerning the purchase of the Shares from the Company by the Underwriter.

1. Representations, Warranties and Agreements of the Company. The Company represents, warrants and agrees that:

(a) Registration Statement. An automatic shelf registration statement on Form S-3 (File No. 333-210044) relating to the Shares has (i) been prepared by the Company in conformity with the requirements of the Securities Act of 1933, as amended (the “Securities Act”), and the rules and regulations (the “Rules and Regulations”) of the Securities and Exchange Commission (the “Commission”) thereunder; (ii) been filed with the Commission under the Securities Act; and (iii) become effective under the Securities Act. Copies of such registration statement and any amendment thereto have been made available by the Company to the Underwriter. As used in this Agreement:

(i) “Applicable Time” means 6:30 p.m. (New York City time) on June 16, 2016;

(ii) “Base Prospectus” means the base prospectus filed as part of the Registration Statement, in the form in which it has most recently been amended on or prior to the date hereof, relating to the Shares;

(iii) “Effective Date” means any date as of which any part of such registration statement relating to the Shares became, or is deemed to have become, effective under the Securities Act in accordance with the Rules and Regulations;

(iv) “Issuer Free Writing Prospectus” means each “issuer free writing prospectus” (as defined in Rule 433 under the Securities Act);

(v) “Preliminary Prospectus” means any preliminary prospectus relating to the Shares, including the Base Prospectus and any preliminary prospectus supplement thereto relating to the Shares, included in such registration statement or filed with the Commission pursuant to Rule 424(b) under the Securities Act;

(vi) “Pricing Disclosure Package” means, as of the Applicable Time, the most recent Preliminary Prospectus, together with the information included in Schedule I hereto and each Issuer Free Writing Prospectus listed in Schedule II hereto, other than a “road show” that is an Issuer Free Writing Prospectus but is not required to be filed under Rule 433 under the Securities Act;

(vii) “Prospectus” means the final prospectus relating to the Shares, including the Base Prospectus and any prospectus supplement thereto relating to the Shares, as filed with the Commission pursuant to Rule 424(b) under the Securities Act; and

(viii) “Registration Statement” means such registration statement, as amended as of the Effective Date, including any Preliminary Prospectus, the Prospectus, all exhibits to such registration statement and the information deemed by virtue of Rule 430B under the Securities Act to be part of such registration statement as of the Effective Date.

Any reference to the Registration Statement, Base Prospectus, the Pricing Disclosure Package, any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include any documents incorporated by reference therein pursuant to Form S-3 under the Securities Act. Any reference to the “most recent Preliminary Prospectus” shall be deemed to refer to the latest Preliminary Prospectus included in the Registration Statement or filed pursuant to Rule 424(b) under the Securities Act prior to or on the date hereof (including, for purposes hereof, any documents incorporated by reference therein prior to or on the date hereof). Any reference to any amendment or supplement to any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include any document filed under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), after the date of such Preliminary Prospectus or the Prospectus, as the case may be, and before the date of such amendment or supplement and incorporated by reference in such Preliminary Prospectus or the Prospectus, as the case may be; and any reference to any amendment to the Registration Statement shall be deemed to include any document filed with the Commission pursuant to Section 13(a), 14 or 15(d) of the Exchange Act after the Effective Date and before the date of such amendment that is incorporated by reference in the Registration Statement. Any reference to the term “Registration Statement” shall be deemed to include any abbreviated registration statement to register additional shares of the Common Stock under Rule 462(b) under the Securities Act (the “Rule 462(b) Registration Statement”).

(b) No Stop Order. The Commission has not issued any order preventing or suspending the use of any Preliminary Prospectus or the Prospectus or suspending the effectiveness of the Registration Statement, and no proceeding for such purpose has been instituted or, to the knowledge of the Company, threatened by the Commission. The Commission has not notified the Company of any objection to the use of the form of the Registration Statement or any post-effective amendment thereto.

(c) Ineligible Issuer. The Company was not at the time of initial filing of the Registration Statement and at the earliest time thereafter that the Company or any other offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) under the Securities Act) of the Shares, is not on the date hereof and will not be on the applicable Delivery Date (as defined in Section 4), an “ineligible issuer” (as defined in Rule 405 under the Securities Act).

(d) Well-Known Seasoned Issuer. The Company has been since the time of initial filing of the Registration Statement and continues to be a “well-known seasoned issuer” (as defined in Rule 405) eligible to use Form S-3 for the offering of the Shares, including not having been an “ineligible issuer” (as defined in Rule 405) at any such time or date. The Registration Statement is an “automatic shelf registration statement” (as defined in Rule 405) and was filed not earlier than the date that is three years prior to the applicable Delivery Date.

(e) Form of Documents. The Registration Statement conformed and will conform in all material respects on the Effective Date and on the applicable Delivery Date, and any amendment to the Registration Statement filed after the date hereof will conform in all material respects when filed, to the applicable requirements of the Securities Act and the Rules and Regulations. The most recent Preliminary Prospectus conformed, and the Prospectus will conform, in all material respects when filed with the Commission pursuant to Rule 424(b) under the Securities Act and on the applicable Delivery Date to the applicable requirements of the Securities Act and the Rules and Regulations. The documents incorporated by reference in any Preliminary Prospectus or the Prospectus conformed, and any further documents so incorporated will conform, when filed with the Commission, in all material respects to the requirements of the Exchange Act or the Securities Act, as applicable, and the rules and regulations of the Commission thereunder.

(f) No Material Misstatements or Omissions in the Registration Statement. The Registration Statement did not, as of the Effective Date, include an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein not misleading; provided that no representation or warranty is made as to information included in or omitted from the Registration Statement in reliance upon and in conformity with written information furnished to the Company by or on behalf of the Underwriter specifically for inclusion therein, which information is specified in Section 8(e).

(g) No Material Misstatements or Omissions in the Prospectus. The Prospectus will not, as of its date or as of the applicable Delivery Date, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information included in or omitted from the Prospectus in reliance upon and in conformity with written information furnished to the Company by or on behalf of the Underwriter specifically for inclusion therein, which information is specified in Section 8(e). The documents incorporated by reference in any Preliminary Prospectus or the Prospectus did, and any further documents filed and incorporated by reference therein will not, when filed with the Commission, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(h) No Material Misstatements or Omissions in the Pricing Disclosure Package. The Pricing Disclosure Package did not, as of the Applicable Time, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information included in or omitted from the Pricing Disclosure Package in reliance upon and in conformity with written information furnished to the Company by or on behalf of the Underwriter specifically for inclusion therein, which information is specified in Section 8(e).

(i) No Material Misstatements or Omissions in Issuer Free Writing Prospectus. Each Issuer Free Writing Prospectus listed in Schedule II hereto (including, without limitation, any “road show” that is a free writing prospectus under Rule 433 under the Securities Act), when considered together with the Pricing Disclosure Package as of the Applicable Time, did not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information included in or omitted from any such Issuer Free Writing Prospectus listed in Schedule II hereto in reliance upon and in conformity with written information furnished to the Company by or on behalf of the Underwriter specifically for inclusion therein, which information is specified in Section 8(e). The information included in each Issuer Free Writing Prospectus listed in Schedule II hereto does not conflict with the information contained in the Registration Statement or the most recent Preliminary Prospectus or to be contained in the Prospectus.

(j) Issuer Free Writing Prospectuses Conform to the Requirements of the Securities Act. Each Issuer Free Writing Prospectus conformed or will conform in all material respects to the applicable requirements of the Securities Act and the Rules and Regulations on the date of first use, and the Company has complied with all prospectus delivery and any filing requirements applicable to such Issuer Free Writing Prospectus pursuant to the Securities Act and the Rules and Regulations. The Company has not made any offer relating to the Shares that would constitute an Issuer Free Writing Prospectus without the prior written consent of the Underwriter. The Company has

retained in accordance with the Securities Act and the Rules and Regulations all Issuer Free Writing Prospectuses that were not required to be filed pursuant to the Securities Act and the Rules and Regulations.

(k) Forward-Looking and Supporting Information. Each of the statements made by the Company in the Registration Statement and the Pricing Disclosure Package and to be made in the Prospectus (and any supplements thereto) within the coverage of Rule 175(b) under the Securities Act was made or will be made, respectively, with a reasonable basis and in good faith.

(l) Formation and Qualification of the Company, its Significant Subsidiaries and White Cliffs. Each of the Company, its “significant subsidiaries” (as defined in Rule 405 under the Securities Act) and any other subsidiary listed on Schedule IV (excluding White Cliffs Pipeline, L.L.C., a Delaware limited liability company (“White Cliffs”), each, a “Significant Subsidiary” and, collectively, the “Significant Subsidiaries”) has been duly organized, is validly existing and in good standing as a corporation or other business entity under the laws of its jurisdiction of organization and is duly qualified to do business and in good standing as a foreign corporation or other business entity in each jurisdiction (as set forth on Schedule IV) in which its ownership or lease of property or the conduct of its businesses requires such qualification, except where the failure to be so qualified or in good standing could not, in the aggregate, (i) reasonably be expected to have a material adverse effect on the condition (financial or otherwise), results of operations, stockholders’ equity, partners’ capital or members’ equity, properties, business, prospects or net worth of the Company and its Significant Subsidiaries, taken as a whole (a “Material Adverse Effect”) or (ii) subject the stockholders of the Company to any material liability or disability. Each of the Company and its Significant Subsidiaries has all power and authority, as the case may be, necessary to own or lease its properties and to conduct the business in which it is engaged. For the avoidance of doubt, any reference in this Agreement to Significant Subsidiary, Significant Subsidiaries, subsidiary or subsidiaries shall not include White Cliffs.

(m) Capitalization and Validly Issued Shares. The Company has an authorized capitalization as set forth in each of the most recent Preliminary Prospectus and the Prospectus, and all of the issued shares of capital stock of the Company have been duly authorized and validly issued, are fully paid and non-assessable, conform to the description thereof contained in the most recent Preliminary Prospectus and were issued in compliance with federal and state securities laws and not in violation of any preemptive right, resale right, right of first refusal or similar right. All of the issued shares of capital stock or other ownership interest of each Significant Subsidiary of the Company have been duly authorized and validly issued, are fully paid and non-assessable and are wholly or partially owned directly or indirectly by the Company as set forth on Schedule IV, free and clear of all liens, encumbrances, security interests, equities, charges or claims (“Liens”), except for Liens (i) arising in connection with that certain Credit Agreement, dated as of June 17, 2011, among the Company, as Borrower, the lenders party thereto from time to time, and the Royal Bank of Scotland PLC, as administrative agent and collateral agent, as amended to date (as amended, the “SemGroup Credit Agreement”), or that certain Credit Agreement, dated as of

November 10, 2011, among Rose Rock Midstream, L.P., a Delaware limited partnership (the “Partnership”), as Borrower, the lenders party thereto from time to time, and the Royal Bank of Scotland PLC, as administrative agent and collateral agent, as amended to date (as amended, the “Partnership Credit Agreement”), or (ii) as could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(n) Valid Issuance of Shares to be Issued. The Shares to be issued and sold by the Company to the Underwriter hereunder have been duly authorized and, upon payment and delivery in accordance with this Agreement, will be validly issued, fully paid and non-assessable, will conform to the description thereof contained in the Pricing Disclosure Package, will be issued in compliance with federal and state securities laws and will be free of statutory and contractual preemptive rights, rights of first refusal and similar rights.

(o) No Options, Preemptive Rights, Registration Rights or Other Rights. Except as described in the Registration Statement and the most recent Preliminary Prospectus or as provided for in the charter or bylaws (or similar organizational documents) of the Company or any of its Significant Subsidiaries, there are no options, warrants, preemptive rights, rights of first refusal or other rights to subscribe for or to purchase, nor any restriction upon the voting or transfer of, any equity securities of the Company or any of its Significant Subsidiaries.

(p) Authorization, Execution and Delivery of the Underwriting Agreement. The Company has all requisite corporate power and authority to execute, deliver and perform its obligations under this Agreement. This Agreement has been duly and validly authorized, executed and delivered by the Company.

(q) Authorization, Execution and Delivery of the Merger Agreement. The Company has all requisite corporate power and authority to execute, deliver and perform its obligations under the Agreement and Plan of Merger, dated May 30, 2016 (the “Merger Agreement”), between the Company, PBMS, LLC, a Delaware limited liability company and an indirect, wholly owned subsidiary of the Company subject to the terms and conditions of the Merger Agreement, the Partnership and Rose Rock Midstream GP, LLC, a Delaware limited liability company and the general partner of the Partnership. The Merger Agreement has been duly and validly authorized, executed and delivered by the Company and the other parties thereto.

(r) No Conflicts. None of (i) the offering, issuance or sale of the Shares as described in the Registration Statement and the most recent Preliminary Prospectus, (ii) the execution, delivery and performance of this Agreement by the Company, (iii) the application of the proceeds from the sale of the Shares as described under “Use of Proceeds” in the Pricing Disclosure Package (A) conflicts with or will conflict with or constitutes or will constitute a violation of the provisions of the charter or bylaws (or similar organizational documents) of the Company or any of its Significant Subsidiaries, (B) conflicts or will conflict with or constitutes or will constitute a breach or violation of, or a change of control or default (or an event that, with notice or lapse of time or both, would constitute such an event) under, the SemGroup Credit Agreement or the

Partnership Credit Agreement or any indenture, mortgage, deed of trust, license, loan agreement, lease or other agreement or instrument to which the Company or any of its subsidiaries are a party or by which any of them or any of their respective properties may be bound, (C) violates or will violate any statute, law, regulation, ruling or any order, judgment, decree or injunction of any court or governmental agency or body having jurisdiction over the Company or any of its subsidiaries or any of their properties or assets in a proceeding to which any of them or their property is a party or is bound or (D) results or will result in the creation or imposition of any Lien (other than Liens arising under or in connection with the SemGroup Credit Agreement and the Partnership Credit Agreement) upon any property or assets of the Company or any of its subsidiaries, except in the case of clauses (B), (C) and (D) for any such conflicts, violations, breaches, defaults or Liens that, individually or in the aggregate, have not materially impaired and will not materially impair the ability of the Company to consummate the transactions provided for in this Agreement.

(s) No Consents. No consent, approval, authorization, order, registration, filing or qualification (“consent”) of or with any court, governmental agency or body having jurisdiction over the Company or any of its subsidiaries or any of their properties or assets is required in connection with (i) the offering, issuance or sale of the Shares as described in the Registration Statement and the Pricing Disclosure Package, (ii) the execution, delivery and performance of this Agreement by the Company, (iii) the consummation of the transactions contemplated by this Agreement or (iv) the application of the proceeds from the sale of the Shares as described under “Use of Proceeds” in the most recent Preliminary Prospectus, except for registration of the Shares under the Securities Act and consents required under the Exchange Act, applicable state securities or “Blue Sky” laws and the rules of the Financial Industry Regulatory Authority, Inc. (“FINRA”) in connection with the purchase and sale of the Shares by the Underwriter.

(t) No Defaults. Neither the Company nor any of its subsidiaries is in (i) violation of its charter or bylaws (or similar organizational documents), (ii) violation of any law, statute, ordinance, administrative or governmental rule or regulation applicable to it or of any order, judgment, decree or injunction of any court or governmental agency or body having jurisdiction over it or any of its properties or (iii) breach, default (or an event that, with notice or lapse of time or both, would constitute such an event) or violation in the performance of any obligation, agreement, covenant or condition contained in any bond, debenture, note or any other evidence of indebtedness or in any agreement, indenture, lease or other instrument to which it is a party or by which it or any of its properties may be bound, except in the cases of clauses (ii) and (iii) for any such breaches, defaults and violations that, individually or in the aggregate, would not reasonably be expected to materially impair the ability the Company to consummate the transactions provided for in this Agreement.

(u) Financial Statements. The financial statements (including the related notes and supporting schedules) included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus present fairly in all material respects the financial condition, results of operations and cash flows of the entities purported to be shown thereby, at the dates and for the periods indicated, comply

as to form in all material respects with the applicable accounting requirements of the Securities Act and have been prepared in conformity with accounting principles generally accepted in the United States applied on a consistent basis throughout the periods indicated, except to the extent disclosed therein. The other financial information of the Company, including non-GAAP financial measures, if any, contained in the Registration Statement and the Pricing Disclosure Package has been derived from the accounting records of the Company and its subsidiaries, and fairly presents in all material respects the information purported to be shown thereby.

(v) Pro Forma Financial Statements. The pro forma financial statements included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus include assumptions that provide a reasonable basis for presenting the significant effects directly attributable to the transactions and events described therein, the related pro forma adjustments give appropriate effect to those assumptions, and the pro forma adjustments reflect the proper application of those adjustments to the historical financial statement amounts in the pro forma financial statements included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus. The pro forma financial statements included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus comply as to form in all material respects with the applicable requirements of Regulation S-X under the Securities Act.

(w) Independent Registered Public Accounting Firms. Each of (i) BDO USA, LLP, who has certified certain financial statements of the Company and White Cliffs, and (ii) to our knowledge, ▇▇▇▇▇ ▇▇▇▇▇▇▇▇ LLP, who has certified certain financial statements of NGL Energy Partners LP, a Delaware limited partnership (“NGL”), whose reports are incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus, are independent registered public accounting firms with respect to each of the Company, White Cliffs and NGL, as the case may be, as required by the Securities Act and the Public Company Accounting Oversight Board.

(x) Books and Records. The Company and each of its subsidiaries maintain a system of internal control over financial reporting (as such term is defined under Rule 13a-15(f) of the Exchange Act) that complies with the requirements of the Exchange Act and that has been designed by, or under the supervision of, the Company’s principal executive and principal financial officers, 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. The Company and each of its subsidiaries maintain internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorizations; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset accountability; (iii) access to assets is permitted only in accordance with management’s general or specific authorizations; (iv) the recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences; and (v) interactive data in eXtensible Business Reporting Language included or incorporated

by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus fairly present the information called for in all material respects and have been prepared in accordance with the Commission’s rules and guidelines applicable thereto. As of the date of the most recent balance sheet of the Company and its consolidated subsidiaries reviewed or audited by BDO USA, LLP and reviewed by the audit committee of the board of directors of the Company (the “Audit Committee”), there were no material weaknesses in the Company’s or any of its subsidiaries’ internal controls.

(y) Disclosure Controls and Procedures. (i) The Company and each of its Significant Subsidiaries have established and maintain disclosure controls and procedures (as such term is defined under Rule 13a-15(e) of the Exchange Act), (ii) such disclosure controls and procedures are designed to ensure that the information required to be disclosed by the Company and its subsidiaries in the reports to be filed or submitted under the Exchange Act is accumulated and communicated to management of the Company and its Significant Subsidiaries, including their respective principal executive officers and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure to be made, and (iii) such disclosure controls and procedures are effective in all material respects to perform the functions for which they were established.

(z) No Changes in Internal Controls. Since the date of the most recent balance sheet of the Company and its consolidated subsidiaries reviewed or audited by BDO USA, LLP and reviewed by the Audit Committee, (i) the Company has not been advised of or become aware of (A) any significant deficiencies in the design or operation of internal control over financial reporting that are reasonably likely to adversely affect the ability of the Company or any of its consolidated subsidiaries to record, process, summarize and report financial information, or any material weaknesses in internal controls over financial reporting of the Company or any of its consolidated subsidiaries or (B) any fraud, whether or not material, that involves management or other employees of the Company or any of its subsidiaries who have a significant role in the Company’s or any of its consolidated subsidiaries’ internal control over financial reporting, and (ii) there have been no changes in the Company’s or any of its consolidated subsidiaries’ internal control over financial reporting that have materially affected or are reasonably likely to material affect the Company’s or any of its consolidated subsidiaries’ internal controls over financial reporting, including any corrective actions with regard to significant deficiencies and material weaknesses.

(aa) Critical Accounting Policies. The section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies and Estimates” included in the most recent Preliminary Prospectus accurately and fully describes (i) the accounting policies that the Company believes are the most important in the portrayal of the Company’s financial condition and results of operations and that require management’s most difficult, subjective or complex judgments (“Critical Accounting Policies”); (ii) the judgments and uncertainties affecting the application of Critical Accounting Policies; and (iii) the likelihood that materially different amounts would be reported under different conditions or using different assumptions and an explanation thereof.

(bb) ▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act of 2002. There is and has been no failure on the part of the Company or the Company’s directors or officers, in their capacities as such, to comply in all material respects with any provision of the ▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act of 2002 or the rules and regulations promulgated in connection therewith or the rules of the New York Stock Exchange, in each case that are effective and applicable to the Company.

(cc) No Material Changes. Except as described in the Registration Statement and the Pricing Disclosure Package, since the date of the latest audited financial statements included in the most recent Preliminary Prospectus, neither the Company nor any of its subsidiaries has (i) sustained 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, (ii) issued or granted any securities, (iii) incurred any material liability or obligation, direct or contingent, other than liabilities and obligations that were incurred in the ordinary course of business, (iv) entered into any material transaction not in the ordinary course of business or (v) other than dividends or distributions paid in the ordinary course, declared or paid any dividend or distribution on its equity interests, and since such date, there has not been any change in the equity interests, as applicable, or long-term debt of the Company or any of its subsidiaries or any adverse change, or any development involving a prospective adverse change, in or affecting the condition (financial or otherwise), results of operations, stockholders’ equity, partners’ capital or members’ equity, properties, management, business or prospects of the Company or any of its subsidiaries taken as a whole, in each case except as could not, in the aggregate, reasonably be expected to have a Material Adverse Effect.

(dd) Title to Properties. The Company and each of its subsidiaries, directly or indirectly, have good and marketable title to all real property and good title to all personal property described in the Registration Statement and the most recent Preliminary Prospectus as being owned by it, in each case free and clear of all Liens except as described in the Registration Statement and the most recent Preliminary Prospectus and except for any Liens that could not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect. All real property and buildings held under lease by the Company and its subsidiaries, directly or indirectly, are held by them under valid, subsisting and enforceable leases, with such exceptions as do not materially interfere with the use made or proposed to be made of such properties taken as a whole as described in the Registration Statement and the most recent Preliminary Prospectus.

(ee) Rights of Way. The Company and each of its subsidiaries, directly or indirectly, have such consents, easements, rights-of-way, permits or licenses from each person (collectively, “rights-of-way”) as are necessary to conduct their businesses in the manner described, subject to the limitations described in the Registration Statement and the most recent Preliminary Prospectus, if any, except for such rights-of-way that, if not obtained, could not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect; the Company and each of its subsidiaries have, or at the applicable Delivery Date will have, fulfilled and performed, in all material respects, their obligations with respect to such rights-of-way; and no event has occurred that allows, or after notice or lapse of time would allow, revocation or termination thereof or would

result in any impairment of the rights of the holder of any such rights-of-way, except for such revocations, terminations and impairments that, individually or in the aggregate, could not reasonably be expected to have a Material Adverse Effect.

(ff) Permits. Except as described in the Registration Statement and the most recent Preliminary Prospectus, the Company and each of its Significant Subsidiaries, directly or indirectly, have such permits, licenses, patents, franchises, certificates of need and other approvals or authorizations of governmental or regulatory authorities (“Permits”) as are necessary under applicable law to own its properties and conduct their businesses in the manner described in the Registration Statement and the most recent Preliminary Prospectus, except for any failures to have a Permit that could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. The Company and each of its Significant Subsidiaries have fulfilled and performed all of its obligations with respect to the Permits, and no event has occurred that allows, or after notice or lapse of time would allow, revocation or termination thereof or results in any other impairment of the rights of the holder or any such Permits, except for any of the foregoing that could not reasonably be expected to have a Material Adverse Effect. Neither the Company nor any of its Significant Subsidiaries has received notice of any revocation or modification of any such Permits, or has any reason to believe that any such Permits will not be renewed in the ordinary course, that, individually or in the aggregate, could reasonably be expected to have a Material Adverse Effect.

(gg) Intellectual Property. The Company and each of its Significant Subsidiaries own or possess adequate rights to use all material patents, patent applications, trademarks, service marks, trade names, trademark registrations, service ▇▇▇▇ 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 and have no reason to believe that the conduct of their businesses conflicts with, and have not received any notice of any claim of conflict with, any such rights of others, except in each case as could not reasonably be expected to have a Material Adverse Effect.

(hh) Legal Proceedings. Except as described in the Registration Statement and the Pricing Disclosure Package, there are no legal or governmental proceedings pending to which the Company or any of its subsidiaries is a party or of which any property or assets of the Company or any of its subsidiaries is the subject that would, in the aggregate, reasonably be expected to have a Material Adverse Effect or to materially impair the ability of the Company to consummate the transactions provided for in this Agreement; and to the Company’s knowledge, no such proceedings are threatened or contemplated by governmental authorities or others.

(ii) Contracts to be Described or Filed. There are no contracts or other documents required by the Securities Act to be described in the Registration Statement or the most recent Preliminary Prospectus or filed as exhibits to the Registration Statement, that are not described and filed as required. The statements made in the most recent Preliminary Prospectus, insofar as they purport to constitute summaries of the terms of

the contracts and other documents described and filed, constitute accurate summaries of the terms of such contracts and documents in all material respects. Neither the Company nor any of its subsidiaries has knowledge that any other party to any such contract or other document has any intention not to render full performance as contemplated by the terms thereof.

(jj) Summaries of Law. Statements made in the most recent Preliminary Prospectus insofar as they purport to constitute summaries of the terms of statutes, rules or regulations, or legal or governmental proceedings or contracts and other documents, constitute accurate summaries of the terms of such statutes, rules and regulations, and legal and governmental proceedings or contracts and other documents in all material respects.

(kk) Insurance. The Company and each of its Significant Subsidiaries maintain, or are entitled to the benefits of, insurance covering their properties, operations, personnel and businesses against such losses and risks as is reasonably adequate to protect them and their businesses in a manner consistent with other businesses similarly situated. All policies of insurance of the Company and its Significant Subsidiaries are in full force and effect; and the Company and each of its Significant Subsidiaries are in compliance with the terms of such policies in all material respects; neither the Company nor any of its Significant Subsidiaries has received notice from any insurer or agent of such insurer that capital improvements or other expenditures are required or necessary to be made in order to continue such insurance; there are no claims by the Company or any of its Significant Subsidiaries under any such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause; and neither the Company nor any such Significant Subsidiary has any 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 at a cost that could not reasonably be expected to have a Material Adverse Effect.

(ll) Certain Relationships and Related Party Transactions. No relationship, direct or indirect, exists between or among the Company, on the one hand, and any “affiliate,” equity holder, director, manager, officer, customer or supplier of the Company, on the other hand, that is required by the Securities Act to be disclosed in the Registration Statement and the most recent Preliminary Prospectus that is not so disclosed. There are no outstanding personal loans, advances (except normal advances for business expenses in the ordinary course of business) or guarantees of indebtedness by the Company or any of its subsidiaries to or for the benefit of any of the executive officers, directors or managers of the Company or any of its subsidiaries or their respective family members.

(mm) No Labor Dispute. No labor disturbance by or dispute with the employees of the Company or any of its Significant Subsidiaries exists or, to the knowledge of the Company, is imminent or threatened that could reasonably be expected to have a Material Adverse Effect.

(nn) Environmental Compliance. (i) The Company and each of its subsidiaries are, and at all times prior hereto have been, in compliance with all laws, regulations, ordinances, rules, orders, judgments, decrees, permits or other legal requirements of any governmental authority, including without limitation any international, foreign, national, state, provincial, regional or local authority, relating to pollution, the protection of human health or safety, the environment, or natural resources, or to use, handling, storage, manufacturing, transportation, treatment, discharge, disposal or release of hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”) applicable to such entity, which compliance includes, without limitation, obtaining, maintaining and complying with all permits and authorizations and approvals required by Environmental Laws to conduct their respective businesses, and (ii) neither the Company nor any of its subsidiaries has received notice or otherwise has knowledge of any actual or alleged violation of Environmental Laws, or of any actual or potential liability for or other obligation concerning the presence, disposal or release of hazardous or toxic substances or wastes, pollutants or contaminants, except for any such instances of non-compliance with Environmental Laws, failures to receive required permits, licenses or other approvals or liabilities that could not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect. Except as described in the Registration Statement and the most recent Preliminary Prospectus, (x) there are no proceedings that are pending, or known to be contemplated, against the Company or any of its subsidiaries under Environmental Laws in which a governmental authority is also a party, other than such proceedings regarding which it is reasonably believed no monetary sanctions of $100,000 or more will be imposed, (y) neither the Company nor any of its subsidiaries is aware of any issues regarding compliance with Environmental Laws, including any pending or proposed Environmental Laws, or liabilities or other obligations under Environmental Laws or concerning hazardous or toxic substances or wastes, pollutants or contaminants, that could reasonably be expected to have a material effect on the capital expenditures, earnings or competitive position of the Company or any of its subsidiaries, and (z) neither the Company nor any of its subsidiaries anticipates material capital expenditures relating to Environmental Laws.

(oo) Tax Returns. The Company and each of its subsidiaries have filed all federal, state, local and foreign tax returns required to be filed through the date hereof (which returns are complete and correct in all material respects), subject to permitted extensions, and have timely paid all taxes required to be paid by them and any other assessments, fines or penalties levied against any of them, to the extent any of the foregoing are due and payable, except for (i) those failures to file or pay that could not reasonably be expected to have a Material Adverse Effect or (ii) any such tax payment, assessment, penalty or fine that is currently being contested in good faith by appropriate proceedings.

(pp) ERISA. (i) 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”)) would have any liability (each a “Plan”) has been maintained in material compliance with its

terms and with the requirements of all applicable statutes, rules and regulations including ERISA and the Code; (ii) no prohibited transaction, within the meaning of Section 406 of ERISA or Section 4975 of the Code, has occurred with respect to any Plan excluding transactions effected pursuant to a statutory or administrative exemption; (iii) with respect to each Plan subject to Title IV of ERISA (A) no “reportable event” (within the meaning of Section 4043(c) of ERISA) has occurred or is reasonably expected to occur, excluding any reportable event for which a waiver could apply, (B) no “accumulated funding deficiency” (within the meaning of Section 302 of ERISA or Section 412 of the Code), whether or not waived, has occurred or is reasonably expected to occur that will, individually or in the aggregate, have a Material Adverse Effect and (C) neither the Company nor any member of its Controlled Group has incurred, or reasonably expects to incur, any liability under Title IV of ERISA (other than contributions to the Plan or premiums to the Pension Benefit Guaranty Corporation in the ordinary course and without default) in respect of a Plan (including a “multiemployer plan,” within the meaning of Section 4001(c)(3) of ERISA) that will, individually or in the aggregate, have a Material Adverse Effect; and (iv) each Plan that is intended to be qualified under Section 401(a) of the Code is so qualified and nothing has occurred, to the knowledge of the Company or any member of its Controlled Group, whether by action or by failure to act, which would cause the loss of such qualification, except for any such actions or failures to act that could not, individually or in the aggregate, have a Material Adverse Effect.

(qq) Statistical and Market-Related Data. The statistical and market-related data included or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus are based on or derived from sources that the Company believes to be reliable in all material respects.

(rr) Investment Company. Neither the Company nor any of its Significant Subsidiaries is and, as of each applicable Delivery Date after giving effect to the offer and sale of the Shares and the application of the proceeds therefrom as described under “Use of Proceeds” in the most recent Preliminary Prospectus and the Prospectus, none of them will be (i) an “investment company” or a company “controlled” by an “investment company” within the meaning of the Investment Company Act of 1940, as amended (the “Investment Company Act”), and the rules and regulations of the Commission thereunder, or (ii) a “business development company” (as defined in Section 2(a)(48) of the Investment Company Act).

(ss) Summaries of Capital Stock and the Underwriting Agreement. The statements set forth in the Registration Statement and the Pricing Disclosure Packing and to be included in the Prospectus under the caption “Description of Capital Stock” and “Underwriting”, insofar as they purport to summarize the provisions of the laws and documents referred to therein, are accurate summaries in all material respects.

(tt) No Brokers. Except as described in the Registration Statement and the most recent Preliminary Prospectus, neither the Company nor any of its subsidiaries is a party to any contract, agreement or understanding with any person (other than this Agreement) that would give rise to a valid claim against any of them or the Underwriter for a brokerage commission, finder’s fee or like payment in connection with the offering and sale of the Shares.

(uu) Other Sales. The Company has not sold or issued any securities that would be integrated with the offering of the Shares contemplated by this Agreement pursuant to the Securities Act, the Rules and Regulations or the interpretations thereof by the Commission.

(vv) Stabilization. The Company and its affiliates have not taken, directly or indirectly, any action that has constituted, or that was designed to or could reasonably be expected to cause or result in, the stabilization or manipulation of the price of any security of the Company in connection with the offering of the Shares.

(ww) NYSE Listing of Common Stock. The Shares shall have been approved for listing, subject to official notice of issuance, on the New York Stock Exchange.

(xx) Distribution of Offering Materials. The Company has not distributed and, prior to the later to occur of any Delivery Date and completion of the distribution of the Shares, will not distribute any offering material in connection with the offering and sale of the Shares other than any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus to which the Underwriter has consented in accordance with Section 1(j) or 5(f), any press release or other announcement permitted by Rule 134 under the Securities Act on behalf of the Company.

(yy) No Employment Law Violations. Neither the Company nor any of its subsidiaries is in violation of or has received notice of any violation with respect to any federal or state law relating to discrimination in the hiring, promotion or pay of employees, nor any applicable federal or state wage and hour laws, nor any state law precluding the denial of credit due to the neighborhood in which a property is situated, the violation of any of which could reasonably be expected to have a Material Adverse Effect.

(zz) Anti-Corruption. Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, after due inquiry, any director, officer, agent, employee or other person associated with or acting on behalf of the Company or any of its subsidiaries, has in the course of its actions for, or on behalf of, the Company or any of its subsidiaries: (i) made any unlawful contribution, gift, or other unlawful expense relating to political activity; (ii) made any direct or indirect bribe, kickback, rebate, payoff, influence payment, or otherwise unlawfully provided anything of value, to any “foreign official” (as defined in the U.S. Foreign Corrupt Practices Act of 1977, as amended (collectively, the “FCPA”)) or domestic government official; or (iii) violated or is in violation of any provision of the FCPA, the ▇▇▇▇▇▇▇ ▇▇▇ ▇▇▇▇ of the United Kingdom, as amended (the “▇▇▇▇▇▇▇ ▇▇▇ ▇▇▇▇”), or any other applicable anti-bribery statute or regulation. The Company and its subsidiaries and, to the knowledge of the Company, the Company’s affiliates, have conducted their respective businesses in compliance with the ▇▇▇▇, ▇▇▇▇▇▇▇ ▇▇▇ ▇▇▇▇, and all other applicable anti-bribery statutes and regulations, and have instituted and maintain policies and procedures designed to ensure, and which are reasonably expected to ensure, continued compliance therewith.

(aaa) Money Laundering. 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 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, that have been issued, administered or enforced by any governmental agency (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.

(bbb) No Sanctions. Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, after due inquiry, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is: (i) currently subject to or the target of any sanctions administered or enforced by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”), the U.S. Department of State, the United Nations Security Council (“UNSC”), the European Union (“EU”), Her Majesty’s Treasury (“HMT”), or other relevant sanctions authority (collectively, “Sanctions”); or (ii) located, organized or resident in a country or territory that is the subject or target of Sanctions (including, without limitation, Cuba, Iran, North Korea, Sudan, Syria and Crimea); and the Company will not directly or indirectly use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person, or in any country or territory, that currently is the subject or target of Sanctions or in any other manner that will result in a violation by any person (including any person participating in the transaction whether as an underwriter, advisor, investor or otherwise) of Sanctions. The Company and its subsidiaries have not knowingly engaged in for the past five years, are not now knowingly engaged in, and will not engage in, any dealings or transactions with any individual or entity, or in any country or territory, that at the time of the dealing or transaction, is or was the subject or target of Sanctions.

(ccc) Distribution Restrictions. None of the Company’s subsidiaries is currently prohibited, directly or indirectly, from paying any dividends or distributions to the Company, from making any other distribution on such subsidiary’s equity interests, from repaying to the Company any loans or advances to such subsidiary from the Company or from transferring any of such subsidiary’s property or assets to the Company or any other subsidiary of the Company, except (i) pursuant to the SemGroup Credit Agreement or the Partnership Credit Agreement and (ii) for such prohibitions mandated by the laws of each such subsidiary’s state of formation and applicable organizational documents.

Any certificate signed by any officer of the Company and delivered to the Underwriter or its counsel in connection with the offering of the Shares shall be deemed a representation and warranty by the Company, as to matters covered thereby, to the Underwriter.

2. Purchase of the Shares by the Underwriter. On the basis of the representations, warranties and covenants contained in, and subject to the terms and conditions of, this Agreement, the Company agrees to sell the Firm Shares to the Underwriter, and the Underwriter agrees to purchase such Firm Shares.

In addition, the Company grants to the Underwriter an option to purchase up to 1,125,000 additional shares of the Option Shares. Such option is exercisable in the event that the Underwriter sells more shares of Common Stock than the number of Firm Shares in the offering and as set forth in Section 4 hereof.

The purchase price payable by the Underwriter for both the Firm Shares and any Option Shares is $26.5275 per share.

The Company is not obligated to deliver any of the Firm Shares or Option Shares, as applicable, to be delivered on the applicable Delivery Date, except upon payment for all such Shares to be purchased on such Delivery Date as provided herein.

3. Offering of Shares by the Underwriter. Upon authorization by the Underwriter of the release of the Firm Shares, the Underwriter proposes to offer the Firm Shares for sale upon the terms and conditions to be set forth in the Prospectus.

4. Delivery of and Payment for the Shares. Delivery of and payment for the Firm Shares shall be made at 10:00 a.m., New York City time, on the third full business day following the date of this Agreement at the offices of ▇▇▇▇▇ ▇▇▇▇▇ L.L.P., ▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇, or at such other date or place as shall be determined by agreement between the Underwriter and the Company. This date and time are sometimes referred to as the “Initial Delivery Date.” Delivery of the Firm Shares shall be made to the account of the Underwriter against payment by the Underwriter of the aggregate purchase price of the Firm Shares being sold by the Company to or upon the order of the Company by wire transfer in immediately available funds to the accounts specified by the Company. Time shall be of the essence, and delivery at the time and place specified pursuant to this Agreement is a further condition of the obligation of the Underwriter hereunder. The Company shall deliver the Firm Shares through the facilities of the Depository Trust Company (“DTC”) unless the Underwriter shall otherwise instruct.

The option granted in Section 2 will expire 30 days after the date of this Agreement and may be exercised in whole or from time to time in part by written notice being given to the Company by the Underwriter; provided that if such date falls on a day that is not a business day, the option granted in Section 2 will expire on the next succeeding business day. Such notice shall set forth the aggregate number of Option Shares as to which the option is being exercised, the names in which the Option Shares are to be registered, the denominations in which the Option Shares are to be issued and the date and time, as determined by the Underwriter, when the Option Shares are to be delivered; provided, however, that this date and time shall not be earlier than the Initial Delivery Date nor earlier than the second business day after the date on which the option shall have been exercised nor later than the fifth business day after the date on which the option shall have been exercised. Each date and time the Option Shares are delivered is sometimes referred to as an “Option Shares Delivery Date,” and the Initial Delivery Date and any Option Shares Delivery Date are sometimes each referred to as a “Delivery Date.”

Delivery of the Option Shares by the Company and payment for the Option Shares by the Underwriter shall be made at 10:00 a.m., New York City time, at the offices of ▇▇▇▇▇ ▇▇▇▇▇ L.L.P., ▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇, on the date specified in the corresponding notice described in the preceding paragraph or at such other date or place as shall be determined by agreement between the Underwriter and the Company. On each Option Shares Delivery Date, the Company shall deliver or cause to be delivered the Option Shares to the account of the Underwriter against payment by the Underwriter of the aggregate purchase price of the Option Shares being sold by the Company to or upon the order of the Company by wire transfer in immediately available funds to the accounts specified by the Company. Time shall be of the essence, and delivery at the time and place specified pursuant to this Agreement is a further condition of the obligation of the Underwriter hereunder. The Company shall deliver the Option Shares through the facilities of DTC unless the Underwriter shall otherwise instruct.

5. Further Agreements. The Company agrees with the Underwriter:

(a) Preparation of Prospectus. To prepare the Prospectus in a form approved by the Underwriter and to file such Prospectus pursuant to Rule 424(b) under the Securities Act not later than the Commission’s close of business on the second business day following the execution and delivery of this Agreement; to make no further amendment or any supplement to the Registration Statement or the Prospectus prior to the last Delivery Date except as provided herein; to advise the Underwriter, promptly after it receives notice thereof, of the time when any amendment or supplement to the Registration Statement or the Prospectus has been filed and to furnish the Underwriter with copies thereof; to file promptly all reports required to be filed by the Company with the Commission pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of the Prospectus and for so long as the delivery of a prospectus is required in connection with the offering or sale of the Shares; to advise the Underwriter, 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 the Prospectus or any Issuer Free Writing Prospectus, of the suspension of the qualification of the Shares for offering or sale in any jurisdiction, of the initiation or threatening of any proceeding or examination for any such purpose or of any request by the Commission for the amending or supplementing of the Registration Statement, the Prospectus or any Issuer Free Writing 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 the Prospectus or any Issuer Free Writing Prospectus or suspending any such qualification, to use promptly its best efforts to obtain its withdrawal.

(b) Copies of Registration Statement. To furnish promptly to the Underwriter and to counsel for the Underwriter a signed copy of the Registration Statement as originally filed with the Commission, and each amendment thereto filed with the Commission, including all consents and exhibits filed therewith.

(c) Copies of Documents. To deliver promptly to the Underwriter such number of the following documents as the Underwriter shall reasonably request: (A) conformed copies of the Registration Statement as originally filed with the Commission and each amendment thereto (in each case excluding exhibits other than this Agreement), (B) each Preliminary Prospectus, the Prospectus and any amended or supplemented Prospectus, (C) each Issuer Free Writing Prospectus and (D) any document incorporated by reference in any Preliminary Prospectus or the Prospectus; and, if at any time after the date hereof, a prospectus is required by the Securities Act to be delivered 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 is delivered, not misleading, or, if for any other reason it shall be necessary to amend or supplement the Prospectus or to file under the Exchange Act any document incorporated by reference in the Prospectus in order to comply with the Securities Act or the Exchange Act, to notify the Underwriter and to file such document and to prepare and furnish without charge to the Underwriter and to any dealer in securities as many copies as the Underwriter may from time to time reasonably request of an amended or supplemented Prospectus that will correct such statement or omission or effect such compliance.

(d) Filing of Amendment or Supplement. To file promptly with the Commission any amendment or supplement to the Registration Statement or the Prospectus that may, in the judgment of the Company or the Underwriter, be required by the Securities Act or requested by the Commission.

(e) Copies of Amendment or Supplement. Prior to filing with the Commission any amendment or supplement to the Registration Statement or the Prospectus, any document incorporated by reference in the Prospectus or any amendment to any document incorporated by reference in the Prospectus, to furnish a copy thereof to the Underwriter and counsel for the Underwriter and obtain the consent of the Underwriter to the filing, which consent shall not be unreasonably withheld and which shall be provided to the Company promptly after having been given notice of the proposed filing.

(f) Issuer Free Writing Prospectus. Not to make any offer relating to the Shares that would constitute an Issuer Free Writing Prospectus without the prior written consent of the Underwriter.

(g) Rule 433. To comply with all applicable requirements of Rule 433 under the Securities Act with respect to any Issuer Free Writing Prospectus. If at any time after the date hereof any event shall have occurred as a result of which any Issuer Free Writing Prospectus, as then amended or supplemented, would conflict with the information in the Registration Statement, the most recent Preliminary 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 under which they were made, not misleading, or, if for any other reason it shall be necessary to amend or supplement any Issuer Free Writing Prospectus to comply with the Securities

Act, to notify the Underwriter and to file such document and to prepare and furnish without charge to the Underwriter as many copies as the Underwriter may from time to time reasonably request of an amended or supplemented Issuer Free Writing Prospectus that will correct such conflict, statement or omission or effect such compliance.

(h) Earnings Statement. As soon as practicable after the Effective Date and in any event not later than 16 months after the date hereof, to make generally available to the Company’s security holders and to deliver to the Underwriter an earnings statement of the Company and its subsidiaries (which need not be audited) complying with Section 11(a) of the Securities Act and the Rules and Regulations.

(i) Blue Sky Laws. Promptly from time to time to take such action as the Underwriter may reasonably request to qualify the Shares for offering and sale under the securities or Blue Sky laws of Canada and such other jurisdictions as the Underwriter may reasonably 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 (A) qualify as a foreign corporation in any jurisdiction in which it would not otherwise be required to so qualify, (B) file a general consent to service of process in any such jurisdiction or (C) subject itself to taxation in any jurisdiction in which it would not otherwise be subject.

(j) Lock-Up Period. For a period commencing on the date hereof and ending on the 60th day after the date of the Prospectus (the “Lock-Up Period”), not to, directly or indirectly, (A) offer for sale, sell, pledge, or otherwise dispose of (or enter into any transaction or device that is designed to, or could be expected to, result in the disposition by any person at any time in the future of) any shares of Common Stock or securities convertible into or exercisable or exchangeable for Common Stock (other than (i) the Shares and (ii) shares of Common Stock issued (1) pursuant to employee benefit plans, qualified stock option plans or other employee compensation plans existing on the date hereof or (2) pursuant to currently outstanding options, warrants or rights not issued under one of those plans, provided that any recipient of such Common Stock must agree in writing to be bound by the terms of this Section 5(j) for the remaining term of the Lock-Up Period), or sell or grant options, rights or warrants with respect to any shares of Common Stock or securities convertible into or exercisable or exchangeable for Common Stock (other than the grant of options pursuant to option plans existing on the date hereof), (B) enter into any swap or other derivatives transaction that transfers to another, in whole or in part, any of the economic benefits or risks of ownership of such shares of Common Stock, whether any such transaction described in clause (A) or (B) above is to be settled by delivery of Common Stock or other securities, in cash or otherwise, (C) file or cause to be filed a registration statement, including any amendments thereto, with respect to the registration of any shares of Common Stock or securities convertible, exercisable or exchangeable into Common Stock or any other securities of the Company (other than any registration statement on Form S-8 or a registration statement on Form S-4 related to the Merger Agreement) or (D) publicly disclose the intention to do any of the foregoing, in each case without the prior written consent of the Underwriter. In addition, the Company shall cause each officer or director of the Company and stockholder of the

Company set forth on Schedule III hereto to furnish to the Underwriter, prior to the Initial Delivery Date, a letter or letters, substantially in the form of Exhibit A hereto (the “Lock-Up Agreements”).

(k) Use of Proceeds. To apply the net proceeds from the sale of the Shares being sold by the Company substantially in accordance with the description as set forth in the Prospectus under the caption “Use of Proceeds.”

(l) Rule 463. To file with the Commission such information on Form 10-Q or Form 10-K as may be required by Rule 463 under the Securities Act.

(m) Stabilization. The Company and its affiliates will not take, directly or indirectly, any action designed to or that has constituted or that reasonably would be expected to cause or result in the stabilization or manipulation of the price of any security of the Company in connection with the offering of the Shares.

(n) Necessary Actions. The Company will do and perform all things required to be done and performed under this Agreement by it prior to each Delivery Date, and to satisfy all conditions precedent to the Underwriter’s obligations hereunder to purchase the Shares.

The Underwriter agrees that it shall not include any “issuer information” (as defined in Rule 433 under the Securities Act) in any “free writing prospectus” (as defined in Rule 405 under the Securities Act) used or referred to by the Underwriter without the prior consent of the Company (any such issuer information with respect to whose use the Company has given its consent, “Permitted Issuer Information”); provided that (i) no such consent shall be required with respect to any such issuer information contained in any document filed by the Company or any of its subsidiaries with the Commission prior to the use of such free writing prospectus, and (ii) “issuer information,” as used in this paragraph, shall not be deemed to include information prepared by or on behalf of the Underwriter on the basis of or derived from issuer information.

6. Expenses. The Company agrees, whether or not the transactions contemplated by this Agreement are consummated or this Agreement is terminated, to pay all expenses, costs, fees and taxes incident to and in connection with (a) the authorization, issuance, sale and delivery of the Shares and any stamp duties or other taxes payable in that connection, and the preparation and printing of certificates for the Shares; (b) the preparation, printing and filing under the Securities Act of the Registration Statement (including any exhibits thereto), any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus and any amendment or supplement thereto; (c) the distribution of the Registration Statement (including any exhibits thereto), any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus and any amendment or supplement thereto, or any document incorporated by reference therein, all as provided in this Agreement; (d) the production and distribution of this Agreement, any supplemental agreement of the Underwriter, and any other related documents in connection with the offering, purchase, sale and delivery of the Shares; (e) the listing of the Shares on the New York Stock Exchange; (f) the qualification of the Shares under the securities laws of the several jurisdictions as provided in Section 5(i) and the preparation, printing and distribution of a Blue

Sky Memorandum (including related fees and expenses of counsel to the Underwriter); (g) the preparation, printing and distribution of one or more versions of the Preliminary Prospectus and the Prospectus for distribution in Canada, often in the form of a Canadian “wrapper” (including related fees and expenses of Canadian counsel to the Underwriter); (h) the investor presentations on any “road show” undertaken in connection with the marketing of the Shares, including, without limitation, expenses associated with any electronic road show, travel and lodging expenses of the representatives and officers of the Company and the cost of any aircraft chartered in connection with the road show; and (j) all other costs and expenses incident to the performance of the obligations of the Company, provided that, except as provided in this Section 6 and in Section 11, the Underwriter shall pay their own costs and expenses, including the costs and expenses of its counsel, any transfer taxes on the Shares which they may sell and the expenses of advertising any offering of the Shares made by the Underwriter.

7. Conditions of the Underwriter’s Obligations. The obligations of the Underwriter hereunder are subject to the accuracy, when made and on each Delivery Date, of the representations and warranties of the Company contained herein, to the performance by the Company of its obligations hereunder, and to each of the following additional terms and conditions:

(a) Filing of Prospectus; No Stop Order. The Prospectus shall have been timely filed with the Commission in accordance with Section 5(a); the Company shall have complied with all filing requirements applicable to any Issuer Free Writing Prospectus used or referred to after the date hereof; no stop order suspending the effectiveness of the Registration Statement or preventing or suspending the use of the Prospectus or any Issuer Free Writing Prospectus shall have been issued and no proceeding or examination for such purpose shall have been initiated or, to the knowledge of the Company or the Underwriter, threatened by the Commission; and any request of the Commission for inclusion of additional information in the Registration Statement or the Prospectus or otherwise shall have been complied with. If the Company has elected to rely upon Rule 462(b) under the Securities 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.

(b) No Misstatements or Omissions. No Underwriter shall have discovered and disclosed to the Company on or prior to such Delivery Date that the Registration Statement, the Prospectus or the Pricing Disclosure Package, or any amendment or supplement thereto, contains an untrue statement of a fact which, in the opinion of ▇▇▇▇▇ ▇▇▇▇▇ L.L.P., counsel for the Underwriter, is material or omits to state a fact which, in the opinion of such counsel, is material and is required to be stated therein or is necessary to make the statements therein (in the case of the Prospectus and the Pricing Disclosure Package, in the light of the circumstances under which such statements were made) not misleading.

(c) Authorization and Validity. All corporate proceedings and other legal matters incident to the authorization, form and validity of this Agreement, the Shares, the Registration Statement, the Prospectus and any Issuer Free Writing Prospectus, and all other legal matters relating to this Agreement and any other transactions contemplated by

this Agreement shall be reasonably satisfactory in all material respects to counsel for the Underwriter, and the Company shall have furnished to such counsel all documents and information that they may reasonably request to enable them to pass upon such matters.

(d) Company’s Counsel Opinion. ▇▇▇▇▇▇ & ▇▇▇▇▇▇▇, LLP shall have furnished to the Underwriter its written opinion, as counsel to the Company, addressed to the Underwriter and dated such Delivery Date, in form and substance reasonably satisfactory to the Underwriter, substantially in the form attached hereto as Exhibit B.

(e) General Counsel Opinion. ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇ shall have furnished to the Underwriter her written opinion, as general counsel to the Company, addressed to the Underwriter and dated such Delivery Date, in form and substance reasonably satisfactory to the Underwriter, substantially in the form attached hereto as Exhibit C.

(f) Mexican Counsel Opinion. Dentons ▇▇▇▇▇ ▇▇▇▇▇▇▇, S.C. shall have furnished to the Underwriter its written opinion, as Mexican counsel to the Company, addressed to the Underwriter and dated such Delivery Date, in form and substance reasonably satisfactory to the Underwriter, substantially in the form attached hereto as Exhibit D.

(g) Underwriter’s Counsel Opinion. The Underwriter shall have received from ▇▇▇▇▇ ▇▇▇▇▇ L.L.P., its counsel, such opinion or opinions, dated such Delivery Date, with respect to the issuance and sale of the Shares, the Registration Statement, the Prospectus and the Pricing Disclosure Package and other related matters as the Underwriter may reasonably require, and the Company shall have furnished to such counsel such documents as they reasonably request for the purpose of enabling them to pass upon such matters.

(h) Comfort Letters. At the time of execution of this Agreement, the Underwriter shall have received from BDO USA, LLP and ▇▇▇▇▇ ▇▇▇▇▇▇▇▇ LLP letters, in form and substance reasonably satisfactory to the Underwriter, addressed to the Underwriter and dated the date hereof (i) confirming that they are independent public accountants within the meaning of the Securities Act and are in compliance with the applicable requirements relating to the qualification of accountants under Rule 2-01 of Regulation S-X of the Commission and (ii) stating, as of the date hereof (or, with respect to matters involving changes or developments since the respective dates as of which specified financial information is given in the most recent Preliminary Prospectus, as of a date not more than three days prior to the date hereof), the conclusions and findings of such firm with respect to the financial information and other matters ordinarily covered by accountants’ “comfort letters” to underwriters in connection with registered public offerings.

(i) Bring-Down Comfort Letters. With respect to the letters of BDO USA, LLP and ▇▇▇▇▇ ▇▇▇▇▇▇▇▇ LLP referred to in the preceding paragraph and delivered to the Underwriter concurrently with the execution of this Agreement, (the “initial letters”), the Company shall have furnished to the Underwriter letters (the “bring-down letters”) of such accountants, addressed to the Underwriter and dated such Delivery Date

(i) confirming that they are independent public accountants within the meaning of the Securities Act and are in compliance with the applicable requirements relating to the qualification of accountants under Rule 2-01 of Regulation S-X of the Commission, (ii) stating, as of the date of the bring-down letters (or, with respect to matters involving changes or developments since the respective dates as of which specified financial information is given in the Prospectus, as of a date not more than three days prior to the date of the bring-down letters), the conclusions and findings of such firm with respect to the financial information and other matters covered by the initial letters and (iii) confirming in all material respects the conclusions and findings set forth in the initial letters.

(j) Officers’ Certificate. The Company shall have furnished to the Underwriter a certificate, dated such Delivery Date, of the Chief Executive Officer and the Chief Financial Officer as to such matters as the Underwriter may reasonably request, including, without limitation, a statement:

(i) That the representations, warranties and agreements of the Company in Section 1 are true and correct on and as of such Delivery Date, and the Company has complied with all its agreements contained herein and satisfied all the conditions on its part to be performed or satisfied hereunder at or prior to such Delivery Date;

(ii) That no stop order suspending the effectiveness of the Registration Statement has been issued; and no proceedings or examination for that purpose have been instituted or, to the knowledge of such officers, threatened; and the Commission shall not have notified the Company of any objection to the use of the form of the Registration Statement or any post-effective amendment thereto;

(iii) That they have examined the Registration Statement, the Prospectus and the Pricing Disclosure Package, and, in their opinion, (A)(1) the Registration Statement, as of the Effective Date, (2) the Prospectus, as of its date and on the applicable Delivery Date, and (3) the Pricing Disclosure Package, as of the Applicable Time, did not and do not contain any untrue statement of a material fact and did not and do not omit to state a material fact required to be stated therein or necessary in order to make the statements therein (except in the case of the Registration Statement, in the light of the circumstances under which they were made) not misleading, and (B) since the Effective Date, no event has occurred that should have been set forth in a supplement or amendment to the Registration Statement, the Prospectus or any Issuer Free Writing Prospectus that has not been so set forth; and

(iv) To the effect of Section 7(k) (provided that no representation with respect to the judgment of the Underwriter need be made) and Section 7(l).

(k) No Material Change. Except as described in the Registration Statement and the Pricing Disclosure Package, (i) neither the Company nor any of its subsidiaries shall have sustained, since the date of the latest audited financial statements included in

the most recent Preliminary 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 or (ii) since such date there shall not have been any change in the equity interests 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 condition (financial or otherwise), results of operations, stockholders’ equity, partners’ capital or members’ equity, properties, management, business or prospects of the Company and its subsidiaries taken as a whole, the effect of which, in any such case described in clause (i) or (ii), is, individually or in the aggregate, in the judgment of the Underwriter, 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 on such Delivery Date on the terms and in the manner contemplated in the Prospectus.

(l) No Downgrading. Subsequent to the execution and delivery of this Agreement, to the extent applicable, (i) no downgrading shall have occurred in the rating accorded the Company’s or any of its subsidiaries’ debt securities by any “nationally recognized statistical rating organization” (as that term is used in Section 3(a)(62) of the Exchange Act), and (ii) no such organization shall have publicly announced that it has under surveillance or review, with possible negative implications, its rating of the Company’s or any of its subsidiaries’ debt securities.

(m) No Other Changes. Subsequent to the execution and delivery of this Agreement there shall not have occurred any of the following: (i) trading in securities generally on any securities exchange that has registered with the Commission under Section 6 of the Exchange Act (including the New York Stock Exchange, the NASDAQ Global Select Market, the NASDAQ Global Market or the NASDAQ Capital Market) shall have been suspended or materially limited or the settlement and clearance of such trading generally shall have been materially disrupted or minimum prices shall have been established, (ii) trading in the Common Stock shall have been suspended by the Commission or the New York Stock Exchange, (iii) a general moratorium on commercial banking activities shall have been declared by federal or New York state authorities, or (iv) the United States shall have become engaged in hostilities, there shall have been an escalation in hostilities involving the United States or there shall have been a declaration of a national emergency or war by the United States or (v) there shall have occurred such a material adverse change in general economic, political or financial conditions, including, without limitation, as a result of terrorist activities after the date hereof (or the effect of international conditions on the financial markets in the United States shall be such), as to make it, in the judgment of the Underwriter, impracticable or inadvisable to proceed with the public offering or delivery of the Shares being delivered on such Delivery Date on the terms and in the manner contemplated in the Prospectus.

(n) NYSE Listing. The New York Stock Exchange shall have approved the Shares for listing, subject only to official notice of issuance.

(o) Lock-Up Agreements. The Lock-Up Agreements between the Underwriter and the officers and directors of the Company set forth on Schedule III, delivered to the Underwriter on or before the date of this Agreement, shall be in full force and effect on such Delivery Date.

(p) Other Certificates. On or prior to each Delivery Date, the Company shall have furnished to the Underwriter such further certificates and documents as the Underwriter may reasonably request.

All opinions, letters, evidence and certificates mentioned above or elsewhere in this Agreement shall be deemed to be in compliance with the provisions hereof only if they are in form and substance reasonably satisfactory to counsel for the Underwriter.

8. Indemnification and Contribution.

(a) The Company hereby agrees to indemnify and hold harmless the Underwriter, its directors, officers, employees and agents, each person, if any, who controls the Underwriter within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act, and each affiliate of the Underwriter who has, or who is alleged to have, participated in the distribution of the Shares (such affiliate being referred to herein as a “Participating Affiliate”) from and against any loss, claim, damage or liability, joint or several, or any action in respect thereof (including, but not limited to, any loss, claim, damage, liability or action relating to purchases and sales of Shares), to which the Underwriter or any such director, officer, employee, agent, controlling person or Participating Affiliate may become subject, under the Securities Act or otherwise, insofar as such loss, claim, damage, liability or action arises out of, or is based upon, (i) any untrue statement or alleged untrue statement of a material fact contained in (A) any Preliminary Prospectus, the Registration Statement, the Prospectus or in any amendment or supplement thereto, (B) any Issuer Free Writing Prospectus or in any amendment or supplement thereto, (C) any Permitted Issuer Information used or referred to in any “free writing prospectus” (as defined in Rule 405 under the Securities Act) used or referred to by the Underwriter, (D) any materials or information provided to investors by, or with the approval of, the Company in connection with the marketing of the offering of the Shares, including any “road show” (as defined in Rule 433 under the Securities Act) not constituting an Issuer Free Writing Prospectus (“Non-Prospectus Road Show”) or (E) any Blue Sky application or other document prepared or executed by the Company (or based upon any written information furnished by the Company for use therein) specifically for the purpose of qualifying any or all of the Shares under the securities laws of any state or other jurisdiction (any such application, document or information being hereinafter called a “Blue Sky Application”) or (ii) the omission or alleged omission to state in any Preliminary Prospectus, the Registration Statement, the Prospectus, any Issuer Free Writing Prospectus or in any amendment or supplement thereto or in any Permitted Issuer Information, any Blue Sky Application or any Non-Prospectus Road Show, any material fact required to be stated therein or necessary to make the statements therein (except in the case of the Registration Statement, in the light of the circumstances under which they were made) not misleading, and shall reimburse the Underwriter and each such director, officer, employee, agent, controlling person or Participating Affiliate promptly upon demand for any legal or other expenses reasonably incurred by the Underwriter, director, officer, employee, agent, controlling person or

Participating Affiliate in connection with investigating or defending or preparing to defend against any such loss, claim, damage, liability or action 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, liability or action arises out of, or is based upon, any untrue statement or alleged untrue statement or omission or alleged omission made in any Preliminary Prospectus, the Registration Statement, the Prospectus, any Issuer Free Writing Prospectus or in any such amendment or supplement thereto or in any Permitted Issuer Information, any Blue Sky Application or any Non-Prospectus Road Show, in reliance upon and in conformity with written information concerning the Underwriter furnished to the Company by or behalf of the Underwriter specifically for inclusion therein, which information consists solely of the information specified in Section 8(e). The foregoing indemnity agreement is in addition to any liability which the Company may otherwise have to the Underwriter or to any director, officer, employee, agent, controlling person or Participating Affiliate of the Underwriter.

(b) The Underwriter shall indemnify and hold harmless the Company, its directors, officers and employees, and each person, if any, who controls the Company within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act, from and against any loss, claim, damage or liability, joint or several, or any action in respect thereof, to which the Company or any such director, officer, employee or controlling person may become subject, under the Securities Act or otherwise, insofar as such loss, claim, damage, liability or action arises out of, or is based upon, (i) any untrue statement or alleged untrue statement of a material fact contained in any Preliminary Prospectus, the Registration Statement, the Prospectus, any Issuer Free Writing Prospectus or in any amendment or supplement thereto or in any Blue Sky Application or Non-Prospectus Road Show or (ii) the omission or alleged omission to state in any Preliminary Prospectus, the Registration Statement, the Prospectus, any Issuer Free Writing Prospectus or in any amendment or supplement thereto or in any Blue Sky Application or Non-Prospectus Road Show any material fact required to be stated therein or necessary to make the statements therein (except in the case of the Registration Statement, in the light of the circumstances under which they were made) not misleading, but in each case only to the extent that the untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with written information concerning the Underwriter furnished to the Company by or on behalf of the Underwriter specifically for inclusion therein, which information is limited to the information set forth in Section 8(e). The foregoing indemnity agreement is in addition to any liability that the Underwriter may otherwise have to the Company or any such director, officer, employee or controlling person.

(c) Promptly after receipt by an indemnified party under this Section 8 of notice of any claim or the commencement of any action, the indemnified party shall, if a claim in respect thereof is to be made against the indemnifying party under this Section 8, notify the indemnifying party in writing of the claim or the commencement of that action; provided, however, that the failure to notify the indemnifying party shall not relieve it from any liability which it may have under this Section 8 except to the extent it has been materially prejudiced by such failure (through the forfeiture of substantive rights and defenses), and provided, further, that the failure to notify the indemnifying party shall not

relieve it from any liability which it may have to an indemnified party otherwise than under this Section 8. If any such claim or action shall be brought against an indemnified party, and it shall notify the indemnifying party thereof, the indemnifying party shall be entitled to participate therein and, to the extent that it wishes, jointly with any other similarly notified indemnifying party, to assume the defense thereof with counsel reasonably satisfactory to the indemnified party. After notice from the indemnifying party to the indemnified party of its election to assume the defense of such claim or action, the indemnifying party shall not be liable to the indemnified party under this Section 8 for any legal or other expenses subsequently incurred by the indemnified party in connection with the defense thereof other than reasonable costs of investigation; provided, however, that the indemnified party shall have the right to employ counsel to represent jointly the indemnified party and those other indemnified parties and their respective directors, officers, employees, agents and controlling persons who may be subject to liability arising out of any claim in respect of which indemnity may be sought under this Section 8 if (i) the indemnified party and the indemnifying party shall have so mutually agreed; (ii) the indemnifying party has failed within a reasonable time to retain counsel reasonably satisfactory to the indemnified party; (iii) the indemnified party and its directors, officers, employees, agents and controlling persons shall have reasonably concluded that there may be legal defenses available to them that are different from or in addition to those available to the indemnifying party; or (iv) the named parties in any such proceeding (including any impleaded parties) include both the indemnified parties or their respective directors, officers, employees, agents or controlling persons, on the one hand, and the indemnifying party, on the other hand, and representation of both sets of parties by the same counsel would be inappropriate due to actual or potential differing interests between them, and in any such event described in clauses (i)-(iv) the reasonable fees and expenses of such separate counsel shall be paid by the indemnifying party (it being understood, however, that the indemnifying party shall not be liable for the expenses of more than one separate counsel (in addition to local counsel) in any one action, suit or proceeding or series of related actions, suits or proceedings in the same jurisdiction representing the indemnified parties who are parties to such action, suit or proceeding). No indemnifying party shall (x) without the prior written consent of the indemnified parties (which consent shall not be unreasonably withheld), settle or compromise or consent to the entry of any judgment with respect to any pending or threatened claim, action, suit or proceeding in respect of which indemnification or contribution may be sought hereunder (whether or not the indemnified parties are actual or potential parties to such claim or action) unless such settlement, compromise or consent includes an unconditional release of each indemnified party from all liability arising out of such claim, action, suit or proceeding and 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, or (y) be liable for any settlement of any such action effected without its written consent (which consent shall not be unreasonably withheld), but if settled with the consent of the indemnifying party or if there be a final judgment for the plaintiff in any such action, the indemnifying party agrees to indemnify and hold harmless any indemnified party from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees

and expenses of counsel as contemplated by Section 8(a) hereof, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request or disputed in good faith the indemnified party’s entitlement to such reimbursement prior to the date of such settlement.

(d) If the indemnification provided for in this Section 8 shall for any reason be unavailable to or insufficient to hold harmless an indemnified party under Section 8(a) or 8(b) in respect of any loss, claim, damage or liability, or any action in respect thereof, referred to therein, then each indemnifying party shall, in lieu of indemnifying such indemnified party, contribute to the amount paid or payable by such indemnified party as a result of such loss, claim, damage or liability, or action in respect thereof, (i) in such proportion as shall be appropriate to reflect the relative benefits received by the Company, on the one hand, and the Underwriter, on the other, from the offering of the Shares, or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company, on the one hand, and the Underwriter, on the other, with respect to the statements or omissions that resulted in such loss, claim, damage or liability, or action in respect thereof, as well as any other relevant equitable considerations. The relative benefits received by the Company, on the one hand, and the Underwriter, on the other, with respect to such offering shall be deemed to be in the same proportion as the total net proceeds from the offering of the Shares purchased under this Agreement (before deducting expenses) received by the Company, as set forth in the table on the cover page of the Prospectus, on the one hand, and the total underwriting discounts and commissions received by the Underwriter with respect to the Shares purchased under this Agreement, as set forth in the table on the cover page of the Prospectus, on the other hand. The relative fault shall be determined by reference to whether the untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company or the Underwriter, the intent of the parties and their relative knowledge, access to information and opportunity to correct or prevent such statement or omission. The Company and the Underwriter agree that it would not be just and equitable if contributions pursuant to this Section 8(d) were to be determined by pro rata allocation or by any other method of allocation that does not take into account the equitable considerations referred to herein. The amount paid or payable by an indemnified party as a result of the loss, claim, damage or liability, or action in respect thereof, referred to above in this Section 8(d) shall be deemed to include, for purposes of this Section 8(d), any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8(d), in no event shall the Underwriter be required to contribute any amount in excess of the amount by which the total underwriting discounts and commissions received by the Underwriter with respect to the offering of the Shares exceeds the amount of any damages that the 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 Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.

(e) The Underwriter confirms and the Company acknowledges and agrees that the statements regarding delivery of shares by the Underwriter set forth on the cover page of, and the concession or reallowance figures and the paragraph relating to stabilization by the Underwriter appearing under the caption “Stabilization, Short Positions and Penalty Bids,” in each case appearing in the section titled “Underwriting” in, the most recent Preliminary Prospectus and the Prospectus are correct and constitute the only information concerning the Underwriter furnished in writing to the Company by or on behalf of the Underwriter specifically for inclusion in any Preliminary Prospectus, the Registration Statement, the Prospectus, any Issuer Free Writing Prospectus or in any amendment or supplement thereto or in any Non-Prospectus Road Show.

9. Reserved.

10. Termination. The obligations of the Underwriter hereunder may be terminated by the Underwriter by notice given to and received by the Company prior to delivery of and payment for the Firm Shares if, prior to that time, any of the events described in Sections 7(j), 7(k) or 7(l) shall have occurred or if the Underwriter shall decline to purchase the Shares for any reason permitted under this Agreement.

11. Reimbursement of Underwriter’s Expenses. If (a) the Company shall fail to tender the Shares for delivery to the Underwriter for any reason, or (b) the Underwriter shall decline to purchase the Shares for any reason permitted under this Agreement, the Company will reimburse the Underwriter for all reasonable out-of-pocket expenses (including fees and disbursements of counsel for the Underwriter) incurred by the Underwriter in connection with this Agreement and the proposed purchase of the Shares, and upon demand the Company shall pay the full amount thereof to the Underwriter. Notwithstanding the foregoing, if this Agreement is terminated by reason of the default of the Underwriter or the purchase of the Shares is not consummated as a result of the occurrence of any of the events described in Section 7(m) (other than the occurrence of an event described in Section 7(m)(ii)), the Company shall not be obligated to reimburse the Underwriter on account of those expenses.

12. Research Analyst Independence. The Company acknowledges that the Underwriter’s research analysts and research departments are required to be independent from the investment banking divisions and are subject to certain regulations and internal policies, and that the Underwriter’s research analysts may hold views and make statements or investment recommendations and/or publish research reports with respect to the Company and/or the offering that differ from the views of the investment banking divisions. The Company hereby waives and releases, to the fullest extent permitted by law, any claims that the Company may have against the Underwriter with respect to any conflict of interest that may arise from the fact that the views expressed by their independent research analysts and research departments may be different from or inconsistent with the views or advice communicated to the Company by the Underwriter’s investment banking division. The Company acknowledges that the Underwriter is a full service securities firm and as such from time to time, subject to applicable securities laws, may effect transactions for its own account or the account of its customers and hold long or short positions in debt or equity securities of the companies that may be the subject of the transactions contemplated by this Agreement.

13. No Fiduciary Duty. The Company acknowledges and agrees that in connection with this offering, the sale of the Shares or any other services the Underwriter may be deemed to be providing hereunder, notwithstanding any preexisting relationship, advisory or otherwise, between the parties or any oral representations or assurances previously or subsequently made by the Underwriter: (a) no fiduciary or agency relationship between the Company and any other person, on the one hand, and the Underwriter, on the other, exists; (b) the Underwriter is not acting as advisor, expert or otherwise, to the Company, including, without limitation, with respect to the determination of the public offering price of the Shares, and such relationship between the Company, on the one hand, and the Underwriter, on the other, is entirely and solely commercial, based on arms-length negotiations; (c) any duties and obligations that the Underwriter may have to the Company shall be limited to those duties and obligations specifically stated herein; and (d) the Underwriter and its respective affiliates may have interests that differ from those of the Company. The Company hereby waives any claims that the Company may have against the Underwriter with respect to any breach of fiduciary duty in connection with this offering.

14. Notices, etc. All statements, requests, notices and agreements hereunder shall be in writing, and:

(a) if to the Underwriter, shall be delivered or sent by mail or facsimile transmission to Barclays Capital Inc., ▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇, Attention: Syndicate Registration (Fax: ▇▇▇-▇▇▇-▇▇▇▇), with a copy, in the case of any notice pursuant to Section 8(c) hereof, to the Director of Litigation, Office of the General Counsel, Barclays Capital Inc., ▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇; and

(b) if to the Company, shall be delivered or sent by mail or facsimile transmission to the address of the Company set forth in the Registration Statement, Attention: ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇ (Fax: ▇▇▇-▇▇▇-▇▇▇▇).

Any such statements, requests, notices or agreements shall take effect at the time of receipt thereof. The Company shall be entitled to act and rely upon any request, consent, notice or agreement given or made on behalf of the Underwriter.

15. Persons Entitled to Benefit of Agreement. This Agreement shall inure to the benefit of and be binding upon the Underwriter, the Company and their respective successors. This Agreement and the terms and provisions hereof are for the sole benefit of only those persons, except that (a) the representations, warranties, indemnities and agreements of the Company contained in this Agreement shall also be deemed to be for the benefit of the directors, officers, employees and agents of the Underwriter and each person or persons, if any, who control the Underwriter within the meaning of Section 15 of the Securities Act, and (b) the indemnity agreement of the Underwriter contained in Section 8(b) of this Agreement shall be deemed to be for the benefit of the directors of the Company, the officers of the Company who signed the Registration Statement and any person who controls the Company within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act. Nothing in this

Agreement is intended or shall be construed to give any person, other than the persons referred to in this Section 15, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision contained herein.

16. Survival. The respective indemnities, representations, warranties and agreements of the Company and the Underwriter contained in this Agreement or made by or on behalf of them, respectively, pursuant to this Agreement, shall survive the delivery of and payment for the Shares and shall remain in full force and effect, regardless of any investigation made by or on behalf of any of them or any person controlling any of them.

17. Definition of the Terms “Business Day”, “Affiliate” and “Subsidiary”. For purposes of this Agreement, (a) “business day” means each Monday, Tuesday, Wednesday, Thursday or Friday that is not a day on which banking institutions in New York are generally authorized or obligated by law or executive order to close and (b) “affiliate” and “subsidiary” have the meanings set forth in Rule 405 under the Securities Act.

18. Governing Law. This Agreement and any claim, controversy or dispute arising under or related to this Agreement shall be governed by and construed in accordance with the laws of the State of New York without regard to conflict of laws principles (other than Section 5-1401 of the General Obligations Law).

19. Waiver of Jury Trial. The Company and the Underwriter hereby irrevocably waive, 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.

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

21. Counterparts. This Agreement may be executed in one or more counterparts and, if executed in more than one counterpart, the executed counterparts shall each be deemed to be an original but all such counterparts shall together constitute one and the same instrument.

22. Headings. The headings herein are inserted for convenience of reference only and are not intended to be part of, or to affect the meaning or interpretation of, this Agreement.

[Signature page follows]

If the foregoing correctly sets forth the agreement among the Company and the Underwriter, please indicate your acceptance in the space provided for that purpose below.


Very truly yours,

SEMGROUP CORPORATION

By:		/s/ ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇▇
		▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇▇
		Senior Vice President and Chief Financial Officer

Signature Page to Underwriting Agreement


Accepted:

BARCLAYS CAPITAL INC.

By:		/s/ ▇▇▇▇▇▇▇▇ ▇▇▇▇
		Authorized Representative

Signature Page to Underwriting Agreement

SCHEDULE I

ORALLY CONVEYED PRICING INFORMATION


Number of shares of Shares:		7,500,000 shares of Common Stock or, if the Underwriter exercises in full its option to purchase additional Shares granted in Section 2 hereof, 8,625,000 shares

Public offering price:		$27.00 per share

Schedule I

SCHEDULE II

ISSUER FREE WRITING PROSPECTUSES

None.

Schedule II

SCHEDULE III

PERSONS DELIVERING LOCK-UP AGREEMENTS

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▇▇▇▇▇▇▇ ▇. ▇’▇▇▇▇▇▇▇▇

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▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇▇’▇ lock-up period shall expire on such date that he is no longer an officer of the Company and is not required to file a report under Section 16 of the Exchange Act in connection with any disposition of Common Stock during the lock-up period, and provided further that tax withholding transactions in accordance with the Company’s equity incentive plan or agreement are exempt from the lock-up.

Schedule III

SCHEDULE IV

LIST OF JURISDICTIONS, FOREIGN QUALIFICATION AND OWNERSHIP PERCENTAGE


Subsidiary	Jurisdiction of Organization	Foreign Qualifications	Ownership Percentage
Rose Rock Midstream Holdings, LLC	Delaware	N/A	100%
Rose Rock Midstream GP, LLC	Delaware	Montana, North Dakota, Oklahoma	100%
Rose Rock Midstream, L.P.	Delaware	Colorado, Kansas, Minnesota, Montana, Nebraska, New Mexico, ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇, Wisconsin, Wyoming	54.70%¹
Rose Rock Midstream Operating, LLC	Delaware	N/A	100%*
Rose Rock Midstream Crude, L.P.	Delaware	Colorado, Kansas, Minnesota, Montana, Nebraska, New Mexico, ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇, Wisconsin, Wyoming	99.5%²*
SemCrude Pipeline, L.L.C.	Delaware	N/A	100%*
White Cliffs Pipeline, L.L.C.	Delaware	Colorado, Kansas, Oklahoma	51%³
Wattenberg Holding, LLC	Oklahoma	Colorado	100%*
SemGas, L.P.	Oklahoma	Kansas, Texas	99.5%⁴
SemCanada, L.P.	Oklahoma	N/A	99.5%⁴
SemCanada II, L.P.	Oklahoma	N/A	99.5%⁴
SemCAMS ULC	Nova Scotia	Alberta and British Columbia	100%
SemMaterials Mexico S. de ▇.▇. de C.V.	Mexico	N/A	99.99%
SemGroup Netherlands B.V.	The Netherlands	N/A	100%

¹	The 2.0% of general partner interest is held by Rose Rock Midstream GP, LLC.

²	The 0.5% of interest is held by Rose Rock Midstream Energy GP, LLC.

³	This ownership interest is held by SemCrude Pipeline, L.L.C.

⁴	The 0.5% of interest is held by SemGroup Operating G.P., L.L.C.

*	Entity is directly or indirectly owned by Rose Rock Midstream, L.P. Ownership percentage reflects direct or indirect ownership by Rose Rock Midstream, L.P. The Company’s ownership of Rose Rock Midstream, L.P. is indicated above.

Schedule IV

EXHIBIT A

LOCK-UP LETTER AGREEMENT

BARCLAYS CAPITAL INC.

▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇

▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇

Ladies and Gentlemen:

The undersigned understands that Barclays Capital Inc. (the “Underwriter”) proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) providing for the purchase by the Underwriter of shares (the “Shares”) of Class A Common Stock (“Common Stock”) of SemGroup Corporation, a Delaware corporation (the “Company”), and that the Underwriter proposes to reoffer the Shares to the public (the “Offering”). Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Underwriting Agreement.

In consideration of the execution of the Underwriting Agreement by the Underwriter, and for other good and valuable consideration, the undersigned hereby irrevocably agrees that, without the prior written consent of the Underwriter, the undersigned will not, directly or indirectly, (1) offer for sale, sell, pledge, or otherwise dispose of (or enter into any transaction or device that is designed to, or could be expected to, result in the disposition by any person at any time in the future of) any shares of Common Stock (including, without limitation, shares of Common Stock that may be deemed to be beneficially owned by the undersigned in accordance with the rules and regulations of the Securities and Exchange Commission and shares of Common Stock that may be issued upon exercise of any options or warrants) or securities convertible into or exercisable or exchangeable for Common Stock, (2) enter into any swap or other derivatives transaction that transfers to another, in whole or in part, any of the economic benefits or risks of ownership of shares of Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or other securities, in cash or otherwise, (3) make any demand for or exercise any right or cause to be filed a registration statement, including any amendments thereto, with respect to the registration of any shares of Common Stock or securities convertible into or exercisable or exchangeable for Common Stock or any other securities of the Company beneficially owned by the undersigned, or (4) publicly disclose the intention to do any of the foregoing for a period commencing on the date hereof and ending on the 60^th day after the date of the Prospectus relating to the Offering (such 60-day period, the “Lock-Up Period”).

Notwithstanding the foregoing, the undersigned may transfer shares of Common Stock or any security convertible into, exchangeable for or that represents the right to receive shares of Common Stock (i) as a bona fide gift or gifts, (ii) by will or other testamentary document or intestate succession to the legal representative, heir, beneficiary or a member of the immediate family of the undersigned, (iii) to any trust, partnership, limited liability company or other entity for the direct or indirect benefit of the undersigned or the immediate family of the undersigned, or (iv) to any immediate family member or other dependent; provided each donee,

Exhibit A-1

trustee, distributee or transferee, as the case may be, agrees to be bound in writing by the restrictions set forth herein. For purposes of this Lock-Up Letter Agreement, “immediate family” shall mean any relationship by blood, marriage or adoption, not more remote than first cousin.

In furtherance of the foregoing, the Company and its transfer agent are hereby authorized to decline to make any transfer of securities if such transfer would constitute a violation or breach of this Lock-Up Letter Agreement.

The undersigned understands that the Company and the Underwriter will proceed with the Offering in reliance on this Lock-Up Letter Agreement.

Whether or not the Offering actually occurs depends on a number of factors, including market conditions. Any Offering will only be made pursuant to an Underwriting Agreement, the terms of which are subject to negotiation between the Company and the Underwriter.

This Lock-Up Letter Agreement shall automatically terminate upon the earliest to occur, if any, of (1) the termination of the Underwriting Agreement before the sale of any Shares to the Underwriter or (2) the 10th business day following the date hereof, in the event that the Underwriting Agreement has not been executed by that date.

The undersigned hereby represents and warrants that the undersigned has full power and authority to enter into this Lock-Up Letter Agreement and that, upon request, the undersigned will execute any additional documents necessary in connection with the enforcement hereof. Any obligations of the undersigned shall be binding upon the heirs, personal representatives, successors and assigns of the undersigned.


Very truly yours,

By:
		Name:
		Title:


Dated:

Exhibit A-2

EXHIBIT B

FORM OF OPINION OF ▇▇▇▇▇▇ & ▇▇▇▇▇▇▇, LLP

▇▇▇▇▇▇ & ▇▇▇▇▇▇▇, LLP shall have furnished to the Underwriter its written opinion, as counsel to the Company, addressed to the Underwriter and dated the Delivery Date, in form and substance reasonably satisfactory to the Underwriter, to the effect that:

(a) Each of the Company and each of the subsidiaries set forth on Schedule I (the “Subsidiaries”) is validly existing and in good standing as a corporation or other business entity under the laws of its jurisdiction of organization and is duly qualified to do business and in good standing as a foreign corporation or other business entity in each jurisdiction in which its ownership or lease of property or the conduct of its businesses requires such qualification, except where the failure to be so qualified or in good standing, in the aggregate, could not reasonably be expected to have a Material Adverse Effect. In rendering such opinion, such counsel may state that the opinion in the first sentence of such paragraph is based solely on such counsel’s review of certificates of good standing or similar certifications received from jurisdictions listed on Annex A. Each of the Company and its Subsidiaries has all power and authority necessary to own or hold its properties and conduct the businesses in which it is engaged.

(b) The Company has an authorized capitalization as set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus under the heading “Capitalization.”

(c) The Shares to be issued and sold by the Company to the Underwriter under the Agreement have been duly authorized and, upon payment and delivery in accordance with the Agreement, will be validly issued, fully paid and non-assessable and free of preemptive rights arising from the Certificate of Incorporation and Bylaws of the Company (the “Governing Documents”).

(d) Except as described in the Registration Statement, the Pricing Disclosure Package and the Prospectus, (i) there are no options, warrants or other rights to purchase, any restrictions upon the voting or transfer of, or agreements or other obligations to issue or rights to convert any securities into or exchange any securities for Shares of the Company under any Governing Document or, to such counsel’s knowledge, any other agreement, and (ii) no Person has the right, which has not been waived, under any Governing Document or, to such counsel’s knowledge, other agreement to require the registration under the Securities Act of any sale of securities issued by the Company, by reason of the filing or effectiveness of the Registration Statement.

(e) The Agreement has been duly and validly authorized, executed and delivered by the Company.

(f) Subject to customary assumptions and qualifications, the execution and delivery of the Underwriting Agreement and the issuance and sale of the Shares by the Company to the Underwriter pursuant to the Underwriting Agreement do not:

(i) violate the Company’s Governing Documents; or

Exhibit B-1

(ii) result in the breach of or a default under the SemGroup Credit Agreement or the Partnership Credit Agreement and any of the agreements of the Company or its Subsidiaries that were identified to such counsel by an officer of the Company as being material to the Company and its Subsidiaries, taken as a whole, and listed in Exhibit [●]; or

(iii) violate any federal, New York or Oklahoma statute, rule or regulation, the General Corporation Law of the State of Delaware (the “DGCL”), or the court or governmental orders, writs, judgments or decrees specifically directed to the Company that were identified to such counsel by an officer of the Company as being material to the Company and its Subsidiaries, taken as a whole, and listed in Exhibit [●], applicable to the Company; or

(iv) require any consents, approvals, or authorizations to be obtained by the Company from, or any registrations, declarations or filings to be made by the Company with, any governmental authority under any federal, New York or Oklahoma statute, rule or regulation applicable to the Company or the DGCL that have not been obtained or made.

(g) The Registration Statement is effective under the Securities Act as of March 9, 2016, and the Preliminary Prospectus and the Prospectus were filed with the Commission pursuant to the subparagraph of Rule 424(b) under the Securities Act specified in such opinion on the date specified therein. To such counsel’s knowledge, no stop order suspending the effectiveness of the Registration Statement has been issued and no proceeding or examination for such purpose has been instituted or threatened by the Commission.

(h) The Registration Statement at March 9, 2016, and the Prospectus, as of its date, each appeared on their face to be appropriately responsive in all material respects to the applicable form requirements for registration statements on Form S-3 under the Securities Act and the rules and regulations of the Commission thereunder; it being understood, however, that such counsel expresses no view with respect to Regulation S-T or the financial statements, schedules, or other financial data, or assessments of or reports on the effectiveness of internal control over financial reporting included in, incorporated by reference in or omitted from, the Registration Statement or the Prospectus. For purposes of this paragraph, such counsel may assume that the statements made in the Registration Statement and the Prospectus are correct and complete.

(i) The statements made in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus under the caption “Description of Capital Stock”, insofar as they purport to constitute summaries of the terms of the Common Stock (including the Shares), constitute accurate summaries of the terms of such Common Stock in all material respects.

(j) The Company is not an “investment company” within the meaning of the Investment Company Act of 1940, as amended.

Exhibit B-2

In rendering such opinion, such counsel may (i) state that its opinion is limited to matters governed by the federal laws of the United States of America, the laws of the States of New York and Oklahoma and the DGCL and that such counsel is not admitted in the State of Delaware, and (ii) rely upon such certificates, assumptions, limitations and qualifications as are customary in connection with rendering such opinion.

Such counsel has reviewed the Registration Statement, the Pricing Disclosure Package and the Prospectus and has participated in conferences with officers and other representatives of the Company, representatives of its independent registered public accounting firm and with the Underwriter’s representatives and its counsel, at which the contents of the Registration Statement, the Pricing Disclosure Package, the Prospectus and related matters were discussed. The purpose of such counsel’s professional engagement was not to establish or confirm factual matters set forth in the Registration Statement, the Pricing Disclosure Package or the Prospectus, and such counsel has not undertaken to verify independently any of the factual matters in such documents. Moreover, many of the determinations required to be made in the preparation of the Registration Statement, the Pricing Disclosure Package and the Prospectus involve matters of a non-legal nature. Accordingly, such counsel is not passing upon, and does not assume any responsibility for, the accuracy, completeness or fairness of the statements contained or included in the Registration Statement, the Pricing Disclosure Package and the Prospectus (except to the extent stated in paragraph (i) above). Subject to the foregoing and on the basis of the information such counsel gained in the course of performing the services referred to above, such counsel advises the Underwriter that no facts came to the attention of such counsel that caused it to believe that:

(i) the Registration Statement, at the time it became effective on March 9, 2016, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading;

(ii) the Pricing Disclosure Package, as of the Applicable Time, contained an untrue statement of a material fact or omitted to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; or

(iii) the Prospectus, as of its date or as of such Delivery Date, contained or contains an untrue statement of a material fact or omitted or omits to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading,

except that in each case such counsel need express no comment or belief with respect to the financial statements, schedules or other financial data or assessments or reports on the effectiveness of internal control over financial reporting contained or incorporated by reference in or omitted from the Registration Statement, the Prospectus or the Pricing Disclosure Package.

Exhibit B-3

EXHIBIT C

FORM OF OPINION OF ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇

(a) None of (i) the offering, issuance or sale of the Shares by the Company, (ii) the execution, delivery and performance of this Agreement by the Company, (iii) the consummation of the transactions contemplated by this Agreement by the Company or (iv) the application of the proceeds from the sale of the Shares by the Company as described under “Use of Proceeds” in the most recent Preliminary Prospectus violates or will violate any order, judgment, decree or injunction known to such counsel of any court or governmental agency or body directed to the Company or any of its subsidiaries or any of their properties in a proceeding to which any of them or their property is a party or is bound.

(b) To the knowledge of such counsel, there are no legal or governmental proceedings pending or threatened to which the Company or any of its subsidiaries is a party or to which any property of the Company or any of its subsidiaries is subject that are required to be described in the Registration Statement, the most recent Preliminary Prospectus or the Prospectus but are not so described as required by the Securities Act.

I have participated in conferences with officers and other representatives of the Company and its subsidiaries, the independent registered public accounting firm for the Company, your counsel and your representatives at which the contents of the Registration Statement, the Preliminary Prospectus (which together with the information included on Schedule I of the Underwriting Agreement is referred to herein as the “Disclosure Package”) and the Prospectus and related matters were discussed and, although I have not independently verified and am not passing upon, and do not assume any responsibility for, the accuracy, completeness or fairness of the statements contained in the Registration Statement, the Disclosure Package and the Prospectus (except as and to the extent set forth in paragraph (b) above), on the basis of the foregoing (relying with respect to factual matters to the extent I deem appropriate upon statements by officers and other representatives of the Company and its subsidiaries), I confirm to you that no facts have come to my attention that have led me to believe that (i) the Registration Statement, at the time it became effective on March 9, 2016, contained an untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary to make the statements therein not misleading, (ii) the Disclosure Package, as of 6:30 p.m. (New York City time) on June 16, 2016 (which you have informed me is a time prior to the time of the first sale of the Shares by the Underwriter), contained an untrue statement of a material fact or omitted to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, or (iii) the Prospectus, as of its date and as of the date hereof, contained or contains an untrue statement of a material fact or omitted or omits 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, it being understood that I express no opinion, statement or belief in this letter with respect to (i) the historical and pro forma financial statements and related schedules, including the notes and schedules thereto and the auditor’s report thereon, (ii) any other financial or accounting data, included in, or excluded from, the Registration Statement, the Disclosure Package or the Prospectus and (iii) representations and warranties and other statements of fact included in the exhibits to the Registration Statement.

Exhibit C-1

I express no opinion as to the laws of any jurisdiction other than applicable laws of the State of Oklahoma. References herein to “applicable laws” mean those laws, rules and regulations that, in my experience, are normally applicable to transactions of the type contemplated by the Underwriting Agreement, without my having made any special investigation as to the applicability of any specific law, rule or regulation, and that are not the subject of a specific opinion herein referring expressly to a particular law or laws; provided however, that such references (including without limitation those appearing in paragraph (a) above) do not include any municipal or other local laws, rules or regulations, or any antifraud, environmental, labor, securities, tax, insurance or antitrust laws, rules or regulations.

▇▇▇▇▇▇ & ▇▇▇▇▇▇▇, LLP and ▇▇▇▇▇ ▇▇▇▇▇ L.L.P. are each authorized to rely upon this opinion letter in connection with the offering as if such opinion letter were addressed and delivered to them on the date hereof; provided that this opinion letter may be relied upon by the Underwriter and its counsel only in connection with the offering and no other use or distribution of this opinion letter may be made without my prior written consent.

Exhibit C-2

EXHIBIT D

FORM OF OPINION OF DENTONS ▇▇▇▇▇ ▇▇▇▇▇▇▇, S.C.

(a) SemMaterials Mexico S. de ▇.▇. de C.V. has been duly incorporated and is validly existing as a limited liability company of variable capital (sociedad de responsabilidad limitada de capital variable), in good standing under the laws of Mexico, with full power and authority to own, lease and operate its properties and conduct its business as it is currently conducted.

Exhibit D-1

SemGroup Corporation 7,500,000 of Class A Common Stock UNDERWRITING AGREEMENT

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