Underwriting Agreement, dated November 29, 2018, by and among Vivint Solar, Inc., 313 Acquisition LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated, as representative of the several underwriters named therein

Commission on or prior to the date of this Agreement relating to the Shares, is hereinafter called the “Base Prospectus”; any preliminary prospectus (including any preliminary prospectus supplement) relating to the Shares filed with the Commission pursuant to Rule 424(b) under the Securities Act is hereinafter called a “Preliminary Prospectus”; the various parts of the Initial Registration Statement and the Rule 462(b) Registration Statement, if any, including all exhibits thereto and including any prospectus supplement relating to the Shares that is filed with the Commission and deemed by virtue of Rule 430B under the Securities Act to be part of the Initial Registration Statement, each as amended at the time such part of the Initial Registration Statement became effective as to the Underwriters in accordance with Section 11(d) of the Securities Act or such part of the Rule 462(b) Registration Statement, if any, became or hereafter becomes so effective, are hereinafter collectively called the “Registration Statement”; the Base Prospectus, as amended and supplemented immediately prior to the Applicable Time (as defined in Section 1(c) hereof) is hereinafter called the “Pricing Prospectus”; the form of the final prospectus relating to the Shares filed with Commission pursuant to Rule 424(b) under the Securities Act in accordance with Section 6(a) hereof is hereinafter called the “Prospectus”; any reference herein to the Base Prospectus, the Pricing Prospectus, any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3, as of the date of such prospectus; any reference to any amendment or supplement to the Base Prospectus, any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include any post-effective amendment to the Registration Statement insofar as such amendment or supplement relates to the offering of the Shares, any prospectus supplement relating to the Shares filed with the Commission pursuant to Rule 424(b) under the Securities Act and any documents filed under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and incorporated therein, in each case after the date of the Base Prospectus, such Preliminary Prospectus or the Prospectus, as the case may be; any reference to any amendment to the Registration Statement shall be deemed to refer to and include any annual report of the Company filed pursuant to Section 13(a) or 15(d) of the Exchange Act after the effective date of the Registration Statement that is incorporated by reference in the Registration Statement; any “issuer free writing prospectus” as defined in Rule 433 under the Securities Act relating to the Shares is hereinafter called an “Issuer Free Writing Prospectus”); any oral or written communication with potential investors undertaken in reliance on Section 5(d) of the Securities Act is hereinafter called a “Section 5(d) Communication”; and any Section 5(d) Communication that is a written communication within the meaning of Rule 405 under the Securities Act is hereinafter called a “Section 5(d) Writing”;

(b) No order preventing or suspending the use of any Preliminary Prospectus or any Issuer Free Writing Prospectus has been issued by the Commission, and each Preliminary Prospectus, at the time of filing thereof, conformed in all material respects to the requirements of the Securities Act and the rules and regulations of the Commission thereunder, and did not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by an Underwriter through Merrill Lynch, Pierce, Fenner & Smith Incorporated (“Merrill Lynch” or “you”) expressly for use therein (which information is limited to the information specified in the “blood letter” dated the date hereof and is hereinafter referred to as “Underwriter Information”);

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(c) For the purposes of this Agreement, the “Applicable Time” is 8:00 p.m. (Eastern time) on the date of this Agreement; the Pricing Prospectus, as supplemented by the information listed on Schedule II(c) hereto, taken together (collectively, the “Pricing Disclosure Package”), as of the Applicable Time, did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; and each Issuer Free Writing Prospectus listed on Schedule II(a) hereto does not conflict with the information contained or incorporated by reference in the Registration Statement, the Pricing Disclosure Package or the Prospectus and each such Issuer Free Writing Prospectus, as supplemented by and taken together with the Pricing Disclosure Package, as of the Applicable Time, and each Section 5(d) Writing listed on Schedule II(b) hereto at the time such communication was used did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to statements or omissions made in the Pricing Disclosure Package, an Issuer Free Writing Prospectus or Section 5(d) Writing in reliance upon and in conformity with Underwriter Information;

(d) The documents incorporated by reference in the Pricing Disclosure Package and Prospectus, when they became effective or were filed with the Commission, as the case may be, conformed in all material respects to the requirements of the Securities Act or the Exchange Act, as applicable, and the rules and regulations of the Commission thereunder, and none of such documents 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; and any further documents so filed and incorporated by reference in the Prospectus or any further amendment or supplement thereto (insofar as such amendment or supplement relates to the offering of the Shares), when such documents become effective or are filed with the Commission, as the case may be, will conform in all material respects to the requirements of the Securities Act or the Exchange Act, as applicable, and the rules and regulations of the Commission thereunder and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with Underwriter Information; and no such documents were filed with the Commission since the Commission’s close of business on the business day immediately prior to the date of this Agreement and prior to the execution of this Agreement, except as set forth on Schedule II(d) hereto;

(e) The Registration Statement conforms, and the Prospectus and any further amendments or supplements to the Registration Statement and the Prospectus will conform, in all material respects to the requirements of the Securities Act and the rules and regulations of the Commission thereunder and do not and will not, as of the applicable effective date as to each part of the Registration Statement and any amendment thereto and as of the applicable filing date as to the Prospectus and any amendment or supplement thereto, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; provided, however, that this representation and warranty shall not apply to any statements or omissions made in reliance upon and in conformity with Underwriter Information;

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(f) Neither the Company nor any of its subsidiaries has sustained since the date of the latest audited financial statements included or incorporated by reference in the Pricing Prospectus any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, otherwise than as set forth or contemplated in the Pricing Prospectus; and, since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, there has not been any change in the capital stock (other than as a result of (i) the exercise of stock options, the vesting of restricted stock units or the granting of stock options or restricted stock units pursuant to the Company’s equity incentive plans or (ii) the repurchase of shares of capital stock pursuant to agreements providing for an option to repurchase or a right of first refusal on behalf of the Company, in each case as such (A) equity incentive plans, (B) outstanding options and restricted stock units and (C) agreements are described in the Pricing Prospectus) or material change in long-term debt of the Company or any of its subsidiaries or any material adverse change, or any development involving a prospective material adverse change, in or affecting the general affairs, management, financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, taken as a whole (a “Material Adverse Effect”), otherwise than as set forth or contemplated in the Pricing Prospectus;

(g) The Company and its subsidiaries do not own any fee interest in real property. The Company and its subsidiaries have valid title to all personal property (other than Intellectual Property, which is addressed exclusively in Section 1(s) hereof) owned by them, free and clear of all liens, encumbrances and defects except such as are described in the Pricing Prospectus or such as do not materially affect the value of such property and do not materially interfere with the use made of such property by the Company and its subsidiaries; and any real property and buildings held under lease by the Company and its subsidiaries are held by them, to the Company’s knowledge, under valid leases subject to any site access rights (whether construed as leases, easements, licenses or rights of way) under the Company’s customer agreements and such other exceptions that do not materially affect the value of such property and buildings or materially interfere with the use made of such property and buildings by the Company and its subsidiaries;

(h) The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware, with power and authority (corporate and other) to own its properties and conduct its business as described in the Pricing Prospectus, and has been duly qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it leases real property or conducts any business so as to require such qualification, except where the failure to be so qualified or be in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; each “significant subsidiary” (as defined in Rule 1-02 of Regulation S-X under the Securities Act) of the Company is listed on Schedule IV hereto (together, the “Subsidiaries”) and has been duly organized and is validly existing as a corporation, limited liability company or other entity in good standing under the laws of its jurisdiction of organization, with power and authority (corporate and other) to own its properties and conduct its business as described in the Pricing Prospectus, and has been duly qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it leases real property or conducts any business so as to require such qualification, except where the failure to be so qualified or be in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and each other subsidiary of the Company has been duly incorporated or formed, as applicable, and is validly existing as a corporation or limited liability company, as applicable, and in good standing under the laws of its jurisdiction of incorporation or formation;

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(i) The Company has an authorized capitalization as set forth in the Pricing Prospectus, and all of the outstanding shares of capital stock of the Company have, including the Shares to be sold by the Selling Stockholder, been duly authorized and validly issued and are fully paid and non-assessable and conform in all material respects to the description of the Common Stock contained or incorporated by reference in the Pricing Disclosure Package and the Prospectus; and all of the issued shares of capital stock or limited liability company interests, as applicable, of each subsidiary of the Company have been duly authorized and validly issued, are fully paid and non-assessable and are owned directly or indirectly by the Company, free and clear of all liens, encumbrances, equities or claims, except for (i) liens, encumbrances, equities or claims described in the Pricing Prospectus and the Prospectus and (ii) liens, encumbrances, equities or claims that are not material to the Company;

(j) [Reserved];

(k) Neither the Company nor any of its subsidiaries has taken, directly or indirectly, any action that was designed to or that has constituted or that might reasonably be expected to cause or result in the manipulation of the price of any security of the Company to facilitate the sale of the Shares;

(l) The execution and delivery of this Agreement and the compliance by the Company with this Agreement and the consummation of the transactions herein contemplated will not (i) conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries is bound or to which any of the property or assets of the Company or any of its subsidiaries is subject, (ii) result in any violation of the provisions of the Certificate of Incorporation or By-laws or similar organizational documents of the Company or any of its subsidiaries or (iii) result in any violation of any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over the Company or any of its subsidiaries or any of their properties, except in the case of (i) and (iii) for such violations that would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and no consent, approval, authorization, order, registration or qualification of or with any such court or governmental agency or body is required for the issue of the Shares to be sold by the Company and the sale of the Shares or the consummation by the Company of the transactions contemplated by this Agreement, except for the registration under the Securities Act of the Shares, the approval by the Financial Industry Regulatory Authority (“FINRA”) of the underwriting terms and arrangements and such consents, approvals, authorizations, orders, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Shares by the Underwriters, except where the failure to obtain any such consents, approvals, authorizations, orders, registrations or qualifications would not impair, in any material respect, the ability of the Company to issue and sell the Shares or to consummate the transactions contemplated by this Agreement;

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(m) Neither the Company nor any of its subsidiaries is (i) in violation of its Certificate of Incorporation or By-laws or similar organizational documents, as applicable, or (ii) in default in the performance or observance of any obligation, agreement, covenant or condition contained in any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which it is a party or by which it or any of its properties may be bound, except in the case of (ii) for such defaults as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect;

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

(o) Other than as set forth in the Pricing Prospectus, there are no legal or governmental proceedings pending to which the Company or any of its subsidiaries or, to the Company’s knowledge, any officer or director of the Company is a party or of which any property or assets of the Company or any of its subsidiaries or, to the Company’s knowledge, any officer or director of the Company is the subject which, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect; and, to the Company’s knowledge, no such proceedings are threatened or contemplated by governmental authorities or threatened by others;

(p) Neither the Company nor any of its subsidiaries is required to register as an “investment company”, as such term is defined in the Investment Company Act of 1940, as amended (the “Investment Company Act”);

(q) At the time of filing the Initial Registration Statement the Company was not and is not an “ineligible issuer,” as defined under Rule 405 under the Securities Act;

(r) Ernst & Young LLP, which has certified certain financial statements of the Company and its subsidiaries, is an independent registered public accounting firm as required by the Securities Act and the rules and regulations of the Commission thereunder;

(s) The Company and its subsidiaries own, possess or can acquire on reasonable terms sufficient rights to all material Intellectual Property (defined below) used in the conduct of the business as now conducted by them. “Intellectual Property” means trademarks, trade names, patent rights, copyrights, domain names, trade secrets, inventions, technology, know-how and other intellectual property rights. Except as disclosed in the Pricing Prospectus or as would not, either individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, (i) there are no ownership rights of third parties to any of the Intellectual Property owned by the Company or its subsidiaries; (ii) to the Company’s knowledge, there is no infringement, misappropriation, breach, default or other violation, or the occurrence of any event that with notice or the passage of time would constitute any of the foregoing, by third parties of any of the Intellectual Property of the Company or its subsidiaries; (iii) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by others challenging the Company’s or any subsidiary’s rights in or to, or the violation of any of the license terms of, any of their Intellectual Property, and the Company is unaware of any facts which would form a reasonable basis for any such claim; (iv) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by others challenging the validity, enforceability or scope of any such Intellectual Property, and the Company is unaware of any facts which would form a reasonable basis for any such claim; (v) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by

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others that the Company or any subsidiary infringes, misappropriates or otherwise violates any Intellectual Property owned by others and the Company is unaware of any fact or circumstance that would form a reasonable basis for any such claim; and (vi) none of the Intellectual Property used by the Company or its subsidiaries in their businesses has been obtained or is being used by the Company or its subsidiaries in violation of any contractual obligation binding on the Company or any of its subsidiaries;

(t) (i) There are no strikes or other labor disputes against the Company or any of its subsidiaries pending or, to the knowledge of the Company, threatened; and (ii) hours worked by and payment made to employees of the Company or any of its subsidiaries have not been in violation of the Fair Labor Standards Act or any other applicable laws dealing with such matters, except, in the case of (i) and (ii), as would not reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect;

(u) Except as described in the Pricing Prospectus and the Prospectus, there are no contracts, agreements or understandings between the Company and any person granting such person the right (other than rights which have been waived in writing or otherwise satisfied) to require the Company to file a registration statement under the Securities Act with respect to any securities of the Company owned or to be owned by such person or to require the Company to include such securities in the securities registered pursuant to the Registration Statement or in any securities being registered pursuant to any other registration statement filed by the Company under the Securities Act;

(v) Except as described in the Pricing Prospectus and the Prospectus, the Company has not sold or issued any shares of Common Stock during the six-month period preceding the date of the Prospectus, including any sales pursuant to Rule 144A under, or Regulations D or S of, the Securities Act, other than shares issued pursuant to employee benefit plans, equity incentive plans or other employee compensation plans or pursuant to outstanding options, restricted stock units (“RSUs”), rights or warrants;

(w) Since the date as of which information is given in the Pricing Prospectus and the Prospectus and except as described in the Pricing Prospectus and the Prospectus, the Company has not (i) issued or granted any securities, other than pursuant to employee benefit plans, equity incentive plans or other employee compensation plans or pursuant to outstanding options, RSUs, rights or warrants, (ii) incurred any liability or obligation, direct or contingent, other than liabilities and obligations that were incurred in the ordinary course of business, (iii) entered into any material transaction not in the ordinary course of business or (iv) declared or paid any dividend on its capital stock;

(x) The Company and its Subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the business in which it is engaged; none of the Company or any of its Subsidiaries has been refused any insurance coverage sought or applied for; and none of the Company or any of its Subsidiaries 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 would not have a Material Adverse Effect;

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(y) The Company and each of its subsidiaries (i) are in compliance with all, and have not violated any, laws, regulations, ordinances, rules, orders, judgments, decrees, permits or other legal requirements of any governmental authority, including without limitation any international, national, state, provincial, regional, or local authority, relating to the protection of human health or safety, the environment, or natural resources, or to 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) have not received notice of any actual or alleged violation of Environmental Laws, or of any potential liability for or other obligation concerning the presence, disposal or release of hazardous or toxic substances or wastes, pollutants or contaminants, except where the failure to comply with such Environmental Laws would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. Except as described in the Pricing Prospectus and the Prospectus, (A) 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, (B) the Company and its subsidiaries are not aware of any issues regarding compliance with 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 Adverse Effect on the capital expenditures, earnings or competitive position of the Company and its subsidiaries taken as a whole, and (C) none of the Company and its subsidiaries anticipates incurring material capital expenditures relating to compliance with Environmental Laws;

(z) The Company maintains a system of internal control over financial reporting (as such term is defined in Rule 13a-15(f) under the Exchange Act) that complies with the requirements of the Exchange Act and has been designed by the Company’s principal executive officer and principal financial officer, or under their supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles (it being understood that this subsection shall not require the Company to comply with Section 404 of the Sarbanes-Oxley Act of 2002 as of an earlier date than it would otherwise be required to so comply under applicable law). Except as disclosed in the Pricing Prospectus, the Company’s internal control over financial reporting is effective and the Company is not aware of any material weaknesses in its internal control over financial reporting;

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

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

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

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(dd) The statistical and market-related data included or incorporated by reference in the Pricing Prospectus and the Prospectus under the captions “Prospectus Summary,” “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business” are based on or derived from estimates and sources that the Company believes to be reliable and accurate in all material respects;

(ee) Except as described in the Pricing Prospectus and such as were repaid in full prior to the filing of the Initial Registration Statement, the Company has not, directly or indirectly, including through any subsidiary, extended or maintained credit, or arranged for the extension of credit, or renewed any extension of credit, in the form of a personal loan to or for any of its directors or executive officers;

(ff) Except as described in the Pricing Prospectus and the Prospectus, no relationship, direct or indirect, exists between or among the Company, on the one hand, and the directors, officers, stockholders, customers or suppliers of the Company, on the other hand, that is required to be described in the Pricing Prospectus and the Prospectus which is not so described;

(gg) Except as described in the Pricing Prospectus and the Prospectus, the Company and each of its subsidiaries have filed all material federal, state, local and foreign income and franchise tax returns required to be filed through the date hereof, subject to permitted extensions, and have paid all material taxes due thereon. No material tax deficiency has been determined adversely to the Company or any of its subsidiaries and the Company does not have any knowledge of any tax deficiencies;

(hh) Neither the Company nor any of its subsidiaries or controlled affiliates, nor any director or officer thereof, nor, to the Company’s knowledge, any employee, agent or representative of the Company or of any of its subsidiaries or controlled affiliates, has taken any action in furtherance of an offer, payment, promise to pay, or authorization or approval of the payment or giving of money, property, gifts or anything else of value, directly or indirectly, to any “government official” (including any officer or employee of a government or government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of any of the foregoing, or any political party or party official or candidate for political office) to influence official action or secure an improper advantage for the Company; and the Company and its subsidiaries and controlled affiliates have conducted their businesses in compliance in all material respects with applicable anti-corruption laws and have instituted and maintained policies and procedures designed to promote and achieve compliance with such laws in all material respects;

(ii) Except as would not, either individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, the Company and its subsidiaries possess, and are in compliance with the terms of, all certificates, authorizations, franchises, licenses and permits (“Licenses”) necessary to the conduct of the business now conducted and the Company and its subsidiaries have not received any notice of proceedings relating to the revocation or modification of any Licenses;

(jj) The operations of the Company and its subsidiaries are and have been conducted at all times in material compliance with all applicable financial recordkeeping and reporting requirements, including those of the Bank Secrecy Act, as amended by Title III of the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (the “USA PATRIOT Act”), and the applicable anti-money laundering

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statutes of jurisdictions where the Company and its subsidiaries conduct business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Anti-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 Anti-Money Laundering Laws is pending or, to the knowledge of the Company, threatened;

(kk) (i) The Company represents that neither the Company nor any of its subsidiaries (collectively, the “Entity”) or, to the knowledge of the Entity, any director, officer, employee, agent, affiliate or representative of the Entity, is an individual or entity (“Person”) that is, or is owned fifty percent or more or controlled by a Person that is: (1) listed on any sanctions persons lists administered or enforced by the U.S. Department of Treasury’s Office of Foreign Assets Control (“OFAC”), the United Nations Security Council (“UNSC”), the European Union (“EU”), Her Majesty’s Treasury (“HMT”), or other relevant sanctions authority (collectively, “Sanctions”), or (2) located, organized or resident in a country or territory that is the subject of comprehensive country-wide or territory-wide Sanctions (currently Cuba, Iran, Syria, North Korea and the Crimea region of the Ukraine); (ii) the Entity represents and covenants that it will not, directly or indirectly, use the proceeds of the offering of the Shares, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other Person, to fund any activities of or business (1) with any Person that it has any reason to believe, at the time of such funding, is a designated target of Sanctions, (2) in or involving a country or territory which at the time of such funding is the subject of comprehensive country-wide or territory-wide Sanctions or (3) in any other manner that it has any reason to believe will result in a violation of Sanctions by any Person (including any Person participating in the offering, whether as underwriter, advisor, investor or otherwise); (iii) the Entity represents and covenants that, regardless of Sanctions, it will not, directly or indirectly, knowingly use the proceeds of the offering of the Shares, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other Person, to fund any activities of or business in or involving Iran; and (iv) the Entity represents and covenants that, for the past 5 years, it has not knowingly engaged in, is not now knowingly engaged in, and will not engage in, any dealings or transactions with any Person, or in any country or territory, that at the time of the dealing or transaction is or was the subject of Sanctions;

(ll) There are no contracts or other documents of a character required to be described in the Registration Statement, the Pricing Prospectus or the Prospectus or to be filed as an exhibit to the Registration Statement which are not described or filed as required. Each description of a contract, document or other agreement in the Registration Statement, the Pricing Prospectus and the Prospectus accurately reflects in all material respects the terms of the contract, document or other agreement;

(mm) Except as pre-approved in accordance with the requirements set forth in Section 10A of the Exchange Act, as amended, Ernst & Young LLP have not been engaged by the Company to perform any “prohibited activities” (as defined in such Section 10A);

(nn) Except as would not, either individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, the Company and its subsidiaries have complied, and are presently in compliance, with its privacy policies and other legal obligations regarding the collection, use, transfer, storage, protection, disposal and disclosure by the Company and its subsidiaries of personally identifiable information;

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(oo) Except as would not, either individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, no fund investor has withdrawn its tax equity commitments or notified the Company of an unwillingness or inability to fund its tax equity commitments;

(pp) From the time of the filing of the Initial Registration Statement relating to the Shares with the Commission (or, if earlier, the first date on which a Section 5(d) Communication was made) through the date hereof, the Company has been and is an “emerging growth company” as defined in Section 2(a)(19) of the Securities Act (an “Emerging Growth Company”);

(qq) Other than as set forth in the Pricing Disclosure Package, none of the following events has occurred or exists: (i) a failure to fulfill the obligations, if any, under the minimum funding standards of Section 302 of the United States Employee Retirement Income Security Act of 1974, as amended (“ERISA”), and the regulations and published interpretations thereunder or Section 412 of the Internal Revenue Code of 1986, as amended, and the regulations and published interpretations thereunder with respect to a Plan, determined without regard to any waiver of such obligations or extension of any amortization period; (ii) an audit or investigation by the Internal Revenue Service, the U.S. Department of Labor, the Pension Benefit Guaranty Corporation or any other federal or state governmental agency or any foreign regulatory agency with respect to any Plan; or (iii) any violation of law or applicable qualification standards, with respect to any Plan, except, in the case of (i), (ii) and (iii), as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. Other than as set forth in the Pricing Disclosure Package, none of the following events has occurred or is reasonably likely to occur: (i) an increase in the aggregate amount of contributions required to be made to all Plans in the current fiscal year of the Company and its subsidiaries compared to the amount of such contributions made in the most recently completed fiscal year of the Company and its subsidiaries; (ii) an increase in the “accumulated post-retirement benefit obligations” (within the meaning of Financial Accounting Standards Board Accounting Standards Codification Topic 715) of the Company and its subsidiaries compared to the amount of such obligations in the most recently completed fiscal year of the Company and its subsidiaries; (iii) liability under Title IV of ERISA with respect to any Plan; or (iv) the filing of a material claim by one or more employees or former employees of the Company or any of its subsidiaries related to their employment, except, in the case of (i), (ii), (iii) and (iv) of this sentence, as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. For purposes of this paragraph, the term “Plan” means a plan (within the meaning of Section 3(3) of ERISA) subject to Title IV of ERISA that is sponsored, maintained or contributed to by the Company or any of its subsidiaries and with respect to which the Company or any of its subsidiaries may have any liability;

(rr) 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 any Underwriter for a brokerage commission, finder’s fee or like payment in connection with the offering and sale of the Shares;

(ss) The interactive data in eXtensible Business Reporting Language included or incorporated by reference in the Registration Statement fairly presents the information called for in all material respects and has been prepared in accordance with the Commission’s rules and guidelines applicable thereto; and

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(tt) (A) To the Company’s knowledge, there has been no material security breach or incident of, or material unauthorized access to or disclosure of, or other material compromise of or relating to, the Company’s or its subsidiaries’ information technology and computer systems, networks, hardware, software, data and databases (including any personal information or confidential information of their respective customers, employees, suppliers, and vendors maintained, processed or stored by the Company and its subsidiaries, and any such personal information or confidential information processed or stored by third parties on behalf of the Company and its subsidiaries), equipment or technology (collectively, “IT Systems and Data”); (B) the Company and its subsidiaries have implemented commercially reasonable controls, policies, procedures, and technological safeguards designed to maintain and protect the integrity, continuous operation, redundancy and security of their material IT Systems and Data reasonably consistent with industry standards and practices adopted generally in the industry of the Company and its subsidiaries, or as required by applicable binding regulatory standards; and (C) the Company and its subsidiaries are presently in compliance in all material respects with all applicable laws or statutes, all judgments, orders, rules and regulations of any court or arbitrator or governmental or regulatory authority, and all applicable internal policies and contractual obligations of the Company and its subsidiaries relating to the privacy and security of IT Systems and Data and to the protection of such IT Systems and Data from unauthorized use, access, misappropriation or modification.

2. The Selling Stockholder represents and warrants to, and agrees with, each of the Underwriters and the Company that:

(a) Except (i) as will have been obtained on or prior to each Time of Delivery (as defined herein) for the registration under the Securities Act of the Shares, (ii) as may be required under foreign or state securities or Blue Sky laws or by FINRA or by the Exchange in connection with the purchase and distribution of the Shares by the Underwriters and (iii) as would not reasonably be expected to impair, in any material respect, the ability of the Selling Stockholder to fulfill its obligations under this Agreement, all consents, approvals, authorizations and orders necessary for the execution and delivery by the Selling Stockholder of this Agreement, and for the sale and delivery of the Shares to be sold by the Selling Stockholder hereunder, have been obtained; the Selling Stockholder has full right, power and authority to enter into this Agreement and to sell, assign, transfer and deliver the Shares to be sold by the Selling Stockholder hereunder; and this Agreement has been duly authorized, executed and delivered by or on behalf of the Selling Stockholder;

(b) The sale of the Shares to be sold by the Selling Stockholder hereunder and the compliance by such Selling Stockholder with this Agreement and the consummation of the transactions herein contemplated will not (i) conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, any statute, indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which the Selling Stockholder is a party or by which the Selling Stockholder is bound or to which any of the property or assets of the Selling Stockholder is subject, nor will such action result in any violation of (ii) the provisions of the Limited Liability Company Agreement of the Selling Stockholder or (iii) any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over the Selling Stockholder or any of its subsidiaries or any property or assets of the Selling Stockholder, except in the case of (i) and (iii), as would not, individually or in the aggregate, reasonably be expected to impair, in any material respect, the Selling Stockholder’s ability to fulfill its obligations under this Agreement; and no consent, approval, authorization, order, registration or qualification of or with any such court or

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governmental body or agency is required for the performance by the Selling Stockholder of its obligations under this Agreement and the consummation by the Selling Stockholder of the transactions contemplated by this Agreement in connection with the Shares to be sold by the Selling Stockholder hereunder, except the registration under the Securities Act of the Shares, the approval by FINRA of the underwriting terms and arrangements and such consents, approvals, authorizations, orders, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Shares by the Underwriters;

(c) The Selling Stockholder has, and immediately prior to each Time of Delivery (as defined in Section 5(a) hereof) the Selling Stockholder will have, good and valid title to the Shares to be sold by the Selling Stockholder hereunder at such Time of Delivery, free and clear of all liens, encumbrances, equities or claims; and, upon delivery of such Shares and payment therefor pursuant hereto, good and valid title to such Shares, free and clear of all liens, encumbrances, equities or claims, will pass to the several Underwriters;

(d) On or prior to the date of the Pricing Prospectus, the Selling Stockholder has executed and delivered to the Underwriters an agreement substantially in the form of Annex II hereto;

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

(f) To the extent that any statements or omissions made in the Registration Statement, any Preliminary Prospectus, the Prospectus or any amendment or supplement thereto are made in reliance upon and in conformity with written information furnished to the Company by the Selling Stockholder expressly for use therein (the “Selling Stockholder Information”), such Registration Statement and Preliminary Prospectus did, and the Prospectus and any further amendments or supplements to the Registration Statement and the Prospectus will, when they become effective or are filed with the Commission, as the case may be, conform in all material respects to the requirements of the Securities Act and the rules and regulations of the Commission thereunder and not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading;

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

(h) The obligations of the Selling Stockholder hereunder shall not be terminated by operation of law, whether by the dissolution of the Selling Stockholder, or by the occurrence of any other event; if the Selling Stockholder should be dissolved, or if any other such event should occur, before the delivery of the Shares to be sold by the Selling Stockholder hereunder, the Shares shall be delivered by or on behalf of the Selling Stockholder in accordance with the terms and conditions of this Agreement; and

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

3. Subject to the terms and conditions herein set forth, (a) the Selling Stockholder agrees to sell to each of the Underwriters, and each of the Underwriters agrees, severally and not jointly, to purchase from the Selling Stockholder, at a purchase price per share of $5.1975, the number of Firm Shares set forth opposite the name of such Underwriter in Schedule I hereto and (b) in the event and to the extent that the Underwriters shall exercise the election to purchase Optional Shares as provided below, the Selling Stockholder agrees to sell to each of the Underwriters, and each of the Underwriters agrees, severally and not jointly, to purchase from the Selling Stockholder, at the purchase price per share set forth in clause (a) of this Section 3, that portion of the number of Optional Shares as to which such election shall have been exercised (to be adjusted by you so as to eliminate fractional shares) determined by multiplying such number of Optional Shares by a fraction, the numerator of which is the maximum number of Optional Shares which such Underwriter is entitled to purchase as set forth opposite the name of such Underwriter in Schedule I hereto and the denominator of which is the maximum number of Optional Shares that all of the Underwriters are entitled to purchase hereunder.

The Selling Stockholder hereby grants to the Underwriters the right to purchase at their election up to an aggregate of 1,200,000 Optional Shares, at the purchase price per share set forth in the paragraph above, for the sole purpose of covering sales of shares in excess of the number of Firm Shares, provided that the purchase price per Optional Share shall be reduced by an amount per share equal to any dividends or distributions declared by the Company and payable on the Firm Shares but not payable on the Optional Shares. Any such election to purchase Optional Shares may be exercised only by written notice from you to the Company and the Selling Stockholder, given within a period of 30 calendar days after the date of this Agreement and setting forth the aggregate number of Optional Shares to be purchased and the date on which such Optional Shares are to be delivered, as determined by you but in no event earlier than the First Time of Delivery (as defined in Section 5(a) hereof) or, unless you and the Company and the Selling Stockholder otherwise agree in writing, earlier than two or later than ten business days after the date of such notice.

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

5. (a) The Shares to be purchased by each Underwriter hereunder, in book entry form, and in such authorized denominations and registered in such names as Merrill Lynch may request upon at least forty-eight hours’ prior notice to the Company and the Selling Stockholder, shall be delivered by or on behalf of the Selling Stockholder to Merrill Lynch, through the facilities of the Depository Trust Company (“DTC”), for the account of such Underwriter, against payment by or on behalf of such Underwriter of the purchase price therefor by wire transfer of Federal (same-day) funds to the account specified by the Selling Stockholder to Merrill Lynch at least forty-eight hours in advance. The time and date of such delivery and payment shall be, with respect to the Firm Shares, 9:30 a.m., New York City time, on December 4, 2018 or such other time and date as Merrill Lynch and the Company and the Selling Stockholder may agree upon in writing, and, with respect to the Optional Shares, 9:30 a.m., New York time, on the date specified by Merrill Lynch in each written notice of the Underwriters’ election to purchase such Optional Shares, or such other time and date as Merrill Lynch and the Company and the Selling Stockholder may agree upon in writing. Such time and date for delivery of the Firm Shares is herein called the “First Time of Delivery”, each such time and date for delivery of the Optional Shares, if not the First Time of Delivery, is herein called the “Second Time of Delivery”, and each such time and date for delivery is herein called a “Time of Delivery”.

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(b) The documents to be delivered at each Time of Delivery by or on behalf of the parties hereto pursuant to Section 9 hereof, including the cross receipt for the Shares and any additional documents requested by the Underwriters pursuant to Section 9(k) hereof will be delivered at the offices of Simpson Thacher & Bartlett LLP, 2475 Hanover Street, Palo Alto, CA 94304 (the “Closing Location”), and appropriate book entries with respect to the Shares will be made with DTC or its designated custodian, all at such Time of Delivery. A meeting will be held at the Closing Location at 12:00 p.m., New York City time, on the New York Business Day next preceding such Time of Delivery, at which meeting the final drafts of the documents to be delivered pursuant to the preceding sentence will be available for review by the parties hereto. For the purposes of this Agreement, “New York Business Day” shall mean each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which banking institutions in New York City are generally authorized or obligated by law or executive order to close.

6. The Company agrees with each of the Underwriters:

(a) To prepare the Prospectus in a form approved by you and to file such Prospectus pursuant to Rule 424(b) under the Securities Act not later than the Commission’s close of business on the second business day following the execution and delivery of this Agreement, or, if applicable, such earlier time as may be required under the Securities Act; to make no further amendment or any supplement to the Registration Statement, the Base Prospectus or the Prospectus prior to the last Time of Delivery that shall be disapproved by you promptly after reasonable notice thereof; to advise you, promptly after it receives notice thereof, of the time when any amendment to the Registration Statement has been filed or becomes effective or any amendment or supplement to the Prospectus has been filed and to furnish you with copies thereof; to file promptly all materials required to be filed by the Company with the Commission pursuant to Rule 433(d) under the Securities Act within the time required by such Rule; to file promptly all reports and any definitive proxy or information statements 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 (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act) is required in connection with the offering or sale of the Shares; to advise you, promptly after it receives notice thereof, of the issuance by the Commission of any stop order or of any order preventing or suspending the use of any Preliminary Prospectus or other prospectus in respect of the Shares, of the suspension of the qualification of the Shares for offering or sale in any jurisdiction, of the initiation or threatening of any proceeding for any such purpose, or of any request by the Commission for the amending or supplementing of the Registration Statement or the Prospectus or for additional information; and, in the event of the issuance of any stop order or of any order preventing or suspending the use of any Preliminary Prospectus or other prospectus relating to the Shares or suspending any such qualification, to promptly use its best efforts to obtain the withdrawal of such order;

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

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(c) If by the third anniversary (the “Renewal Deadline”) of the initial effective date of the Registration Statement, any of the Shares remain unsold by the Underwriters, the Company will file, if it has not already done so and is eligible to do so, a new shelf registration statement relating to the Shares, in a form satisfactory to you and will use its best efforts to cause such registration statement to be declared effective within 180 days after the Renewal Deadline. The Company will take all other action necessary or appropriate to permit the public offering and sale of the Shares to continue as contemplated in the expired registration statement relating to the Shares. References herein to the Registration Statement shall include such new automatic shelf registration statement or such new shelf registration statement, as the case may be;

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

(e) To make generally available to its securityholders as soon as practicable (which may be satisfied by filing with EDGAR (as defined below)), but in any event not later than sixteen months after the effective date of the Registration Statement (as defined in Rule 158(c) under the Securities Act), 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 of the Commission thereunder (including, at the option of the Company, Rule 158);

(f) During the period beginning from the date hereof and continuing to and including the date 60 days after the date of the Prospectus (the “Company Lock-Up Period”), not to (A) offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise transfer or dispose of, directly or indirectly, or file with the Commission a registration statement under the Securities Act relating to, any securities of the Company that are substantially similar to the Shares,

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including but not limited to any options or warrants to purchase shares of Common Stock or any securities that are convertible into or exchangeable for, or that represent the right to receive, Common Stock or any such substantially similar securities, or publicly disclose the intention to make any offer, sale, pledge, disposition or filing, or (B) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of the Common Stock or any such other securities, whether any such transaction described in clause (A) or (B) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise (other than (1) the issuance by the Company of shares of Common Stock or securities convertible into, exchangeable for or that represent the right to receive shares of Common Stock, in each case pursuant to equity incentive plans described in the Pricing Prospectus, (2) the issuance by the Company of shares of Common Stock upon the exercise of an option or upon the exercise, conversion or exchange of exercisable, convertible or exchangeable securities described in the Pricing Prospectus, (3) the issuance by the Company of shares of Common Stock or securities convertible into, exchangeable for or that represent the right to receive shares of Common Stock in connection with (a) the acquisition by the Company or any of its subsidiaries of the securities, business, technology, property or other assets of another person or entity or pursuant to an employee benefit plan assumed by the Company in connection with such acquisition, or (b) the Company’s joint ventures, equipment leasing arrangements, debt financings and other strategic transactions or (4) the filing of any registration statement on Form S-8 relating to securities granted or to be granted pursuant to the Company’s equity incentive plans that are described in the Pricing Prospectus or any assumed employee benefit plan contemplated by clause (3); provided that the aggregate number of shares of Common Stock that the Company may sell or issue or agree to sell or issue pursuant to clause (3) shall not exceed 10% of the total number of shares of Common Stock outstanding immediately following the completion of the transactions contemplated by this Agreement; and provided, further, that in the case of clause (3), (i) each recipient of such securities shall execute and deliver to you, on or prior to the issuance of such securities, a lock-up agreement substantially to the effect set forth in Annex II hereto and (ii) the Company shall enter stop transfer instructions with the Company’s transfer agent and registrar on such securities, which the Company agrees it will not waive or amend without the prior written consent of Merrill Lynch;

(g) If required by Rule 430B(h) under the Securities Act, to prepare a form of prospectus in a form approved by you and to file such form of prospectus pursuant to Rule 424(b) under the Securities Act not later than may be required by Rule 424(b) under the Securities Act; and to make no further amendment or supplement to such form of prospectus which shall be disapproved by you promptly after reasonable notice thereof;

(h) To furnish to its stockholders as soon as practicable after the end of each fiscal year an annual report (including a balance sheet and statements of income, stockholders’ equity and cash flows of the Company and its consolidated subsidiaries certified by independent public accountants) and, as soon as practicable after the end of each of the first three quarters of each fiscal year (beginning with the fiscal quarter ending after the effective date of the Registration Statement), to make available to its stockholders consolidated summary financial information of the Company and its subsidiaries for such quarter in reasonable detail; provided, however, that the Company may satisfy the requirements of this subsection by filing such information through the Commission’s Electronic Data Gathering, Analysis and Retrieval System (“EDGAR”);

(i) During a period of three years from the effective date of the Registration Statement, so long as the Company is subject to the reporting requirements of either Section 13 or 15(d) of the Exchange Act, to furnish to you copies of all reports or other communications (financial or other) furnished to stockholders, and to deliver to you (i) as soon as they are available, copies of any reports

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and financial statements furnished to or filed with the Commission or any national securities exchange on which any class of securities of the Company is listed; and (ii) such additional information concerning the business and financial condition of the Company as you may from time to time reasonably request (such financial statements to be on a consolidated basis to the extent the accounts of the Company and its subsidiaries are consolidated in reports furnished to its stockholders generally or to the Commission); provided, however, that the Company shall not be required to provide documents (y) that are available through EDGAR or (z) the provision of which would require public disclosure by the Company under Regulation FD;

(j) To use its best efforts to maintain the listing of the Shares on the New York Stock Exchange (the “Exchange”);

(k) If the Company elects to rely upon Rule 462(b), the Company shall file a Rule 462(b) Registration Statement with the Commission in compliance with Rule 462(b) by 10:00 p.m., Washington, D.C. time, on the date of this Agreement, and the Company shall at the time of filing either pay to the Commission the filing fee for the Rule 462(b) Registration Statement or give irrevocable instructions for the payment of such fee pursuant to Rule 111(b) under the Securities Act;

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

(m) To promptly notify you if the Company ceases to be an Emerging Growth Company at any time prior to the later of (i) completion of the distribution of the Shares within the meaning of the Securities Act and (ii) completion of the Company Lock-Up Period;

(n) The Company represents and agrees that (i) it has not engaged in, or authorized any other person to engage in, any Section 5(d) Communications and has not distributed, or authorized any other person or entity to distribute, any Section 5(d) Writings except, in each case, for Section 5(d) Communications and Section 5(d) Writings engaged in or distributed (x) with the prior written consent of Merrill Lynch that are listed on Schedule II(b) hereto and (y) to entities that are qualified institutional buyers (as defined in Rule 144A under the Securities Act) or institutions that are accredited investors (as defined in Rule 501(a) under the Securities Act); and (ii) reconfirms that the Underwriters have been authorized to act on its behalf in engaging in Section 5(d) Communications; and

(o) Each Underwriter represents and agrees that any Section 5(d) Communications undertaken by it were with entities that are qualified institutional buyers as defined in Rule 144A under the Securities Act or institutions that are accredited investors as defined in Rule 501(a) under the Securities Act.

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

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

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

8. The Company and the Selling Stockholder covenant and agree with one another and with the several Underwriters that (a) the Company will pay or cause to be paid: (i) the fees, disbursements and expenses of the Company’s counsel and accountants in connection with the registration of the Shares under the Securities Act; (ii) all expenses in connection with the preparation, printing, reproduction and filing of the Registration Statement, the Base Prospectus, any Preliminary Prospectus, any Issuer Free Writing Prospectus and the Prospectus and amendments and supplements thereto and the mailing and delivering of copies thereof to the Underwriters and dealers; (iii) all expenses in connection with any Section 5(d) Communications, including the cost of preparing printing and reproducing any Section 5(d) Writings; (iv) the cost of printing, this Agreement, closing documents (including any compilations thereof) and any other documents in connection with the offering, purchase, sale and delivery of the Shares; (v) all expenses in connection with the qualification of the Shares for offering and sale under state securities laws as provided in Section 6(b) hereof, including the reasonable, documented fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky survey; (vi) all fees and expenses in connection with listing the Shares on the Exchange; (vii) the cost of preparing stock certificates, if applicable; (viii) the cost and charges of any transfer agent or registrar; and (ix) all other costs and expenses incident to the performance of its obligations hereunder which are not otherwise specifically provided for in this Section 8. The provisions of this Section shall not affect any agreement that the Company and the Selling Stockholder may make for the sharing of such costs and expenses. It is understood, however, that, except as provided in this Section 8, and Sections 10 and 13 hereof, the Underwriters will pay all of their own costs and expenses, including the fees of their counsel, stock transfer taxes on resale of any of the Shares by them, and any advertising expenses connected with any offers they may make.

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

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(a) The Prospectus shall have been filed with the Commission pursuant to Rule 424(b) under the Securities Act within the applicable time period prescribed for such filing by the rules and regulations under the Securities Act and in accordance with Section 6(a) hereof; all material required to be filed by the Company pursuant to Rule 433(d) under the Securities Act shall have been filed with the Commission within the applicable time period prescribed for such filing by Rule 433; 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; no stop order suspending the effectiveness of the Registration Statement or any part thereof shall have been issued and no proceeding for that purpose shall have been initiated or threatened by the Commission no stop order suspending or preventing the use of the Prospectus or any Issuer Free Writing Prospectus shall have been initiated or threatened by the Commission; and all requests for additional information on the part of the Commission shall have been complied with to your reasonable satisfaction;

(b) Simpson Thacher & Bartlett LLP, counsel for the Underwriters, shall have furnished to you such written opinion or opinions, dated such Time of Delivery, in form and substance satisfactory to you, with respect to the issuance and sale of the Shares, the Registration Statement and the Prospectus as well as such related matters as you may reasonably request, and such counsel shall have received such papers and information as they may reasonably request to enable them to pass upon such matters;

(c) Wilson Sonsini Goodrich & Rosati, Professional Corporation, counsel for the Company and the Selling Stockholder, shall have furnished to you their written opinions (forms of which are attached as Annex I hereto), dated such Time of Delivery, in form and substance satisfactory to you;

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

(e) (i) The Company and its subsidiaries, taken as a whole, shall not have sustained since the date of the latest audited financial statements included or incorporated by reference in the Pricing Prospectus any loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, otherwise than as set forth or contemplated in the Pricing Prospectus, and (ii) since the respective dates as of which information is given in the Pricing Prospectus there shall not have been any change in the capital stock (other than as a result of (i) the exercise of stock options, the vesting of restricted stock units or the granting of stock options or restricted stock units pursuant to the Company’s equity incentive plans or (ii) the repurchase of shares of capital stock pursuant to agreements providing for an option to repurchase or a right of first refusal on behalf of the Company, in each case as such (A) equity incentive plans, (B) outstanding options and restricted stock units and (C) agreements are described in the Pricing Prospectus) or any material change in long-term debt of the Company or any of its subsidiaries or any change, or any development involving a prospective change, in or affecting the general affairs, management, financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, otherwise than as set forth or contemplated in the Pricing Prospectus, the effect of which, in any such case described in clause (i) or (ii), is in your judgment so material and adverse as to make it impracticable or inadvisable to proceed with the public offering or the delivery of the Shares being delivered at such Time of Delivery on the terms and in the manner contemplated in the Pricing Prospectus;

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(f) On or after the Applicable Time (i) no downgrading shall have occurred in the rating accorded the Company’s debt securities by any “nationally recognized statistical rating organization”, as that term is defined by the Commission for purposes of Rule 436(g)(2) under the Securities Act, and (ii) no such organization shall have publicly announced that it has under surveillance or review, with possible negative implications, its rating of any of the Company’s debt securities;

(g) On or after the Applicable Time there shall not have occurred any of the following: (i) a suspension or material limitation in trading in securities generally on the Exchange; (ii) a suspension or material limitation in trading in the Company’s securities on the Exchange; (iii) a general moratorium on commercial banking activities declared by Federal or New York authorities or a material disruption in commercial banking or securities settlement or clearance services in the United States; (iv) the outbreak or escalation of hostilities involving the United States or the declaration by the United States of a national emergency or war or (v) the occurrence of any other calamity or crisis or any change in financial, political or economic conditions in the United States or elsewhere, if the effect of any such event specified in clause (iv) or (v) in your judgment makes it impracticable or inadvisable to proceed with the public offering or the delivery of the Shares being delivered at such Time of Delivery on the terms and in the manner contemplated in the Prospectus;

(h) The Shares to be sold at such Time of Delivery shall have been duly listed, subject to notice of issuance, on the Exchange;

(i) The Company shall have obtained and delivered to the Underwriters executed copies of an agreement from the parties listed on Schedule III hereto, substantially to the effect set forth in Annex II hereof in form and substance satisfactory to you;

(j) The Company shall have complied with the provisions of Section 6(d) hereof with respect to the furnishing of prospectuses on the New York Business Day next succeeding the date of this Agreement;

(k) The Company and the Selling Stockholder shall have furnished or caused to be furnished to you at such Time of Delivery certificates of officers of the Company and of the Selling Stockholder, respectively, satisfactory to you as to the accuracy of the representations and warranties of the Company and the Selling Stockholder, respectively, herein at and as of such Time of Delivery, as to the performance by the Company and the Selling Stockholder of all of their respective obligations hereunder to be performed at or prior to such Time of Delivery, as to such other matters as you may reasonably request, and the Company shall have furnished or caused to be furnished certificates as to the matters set forth in subsections (a) and (e) of this Section 9; and

(l) On the date of the Prospectus, at 9:30 a.m., New York City time, on the effective date of any post-effective amendment to the Registration Statement filed subsequent to the date of this Agreement and also at each Time of Delivery, the Chief Financial Officer of the Company, in his capacity as such, shall have furnished to you a letter or letters, dated the respective dates of delivery hereof, in form and substance satisfactory to you.

10. (a) The Company will indemnify and hold harmless each Underwriter and their affiliates against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Securities Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained or incorporated by reference in the Registration

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Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus or any “issuer information” filed or required to be filed pursuant to Rule 433(d) under the Securities Act, or any Section 5(d) Writing prepared or authorized by the Company, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such action or claim as such expenses are incurred; provided, however, that the Company shall not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus, or any Section 5(d) Writing in reliance upon and in conformity with Underwriter Information.

(b) The Selling Stockholder will indemnify and hold harmless each Underwriter against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Securities Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, any Issuer Free Writing Prospectus or any Issuer Free Writing Prospectus or any “issuer information” filed or required to be filed pursuant to Rule 433(d) under the Securities Act, or any Section 5(d) Writing prepared or authorized by the Company, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus in reliance upon and in conformity with the Selling Stockholder Information; and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such action or claim as such expenses are incurred provided, however, that the Selling Stockholder shall not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus, or any Section 5(d) Writing in reliance upon and in conformity with Underwriter Information; provided, further, that the liability of the Selling Stockholder pursuant to this subsection (b) shall not exceed the product of the number of Shares sold by the Selling Stockholder including any Optional Shares and the initial public offering price of the Shares (the “Selling Stockholder Net Proceeds”) as set forth in the Prospectus.

(c) Each Underwriter will indemnify and hold harmless the Company and the Selling Stockholder against any losses, claims, damages or liabilities to which the Company or the Selling Stockholder may become subject, under the Securities Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained or incorporated by reference in the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus, or any Section 5(d) Writing, or arise out of or are based upon the omission or alleged omission to state

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therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or any amendment or supplement thereto, or any Issuer Free Writing Prospectus, or any Section 5(d) Writing, in reliance upon and in conformity with Underwriter Information; and will reimburse the Company and the Selling Stockholder for any legal or other expenses reasonably incurred by the Company or the Selling Stockholder in connection with investigating or defending any such action or claim as such expenses are incurred.

(d) Promptly after receipt by an indemnified party under subsection (a), (b) or (c) of this Section 10 of notice of the commencement of any action, such indemnified party shall, if a claim in respect thereof is to be made against the indemnifying party under such subsection, notify the indemnifying party in writing of the commencement thereof; but the omission so to notify the indemnifying party shall not relieve it from any liability that it may have to any indemnified party under such subsection unless and to the extent it has been materially prejudiced through the forfeiture by the indemnifying party of substantial rights and defenses. In case any such action shall be brought against any indemnified party and it shall notify the indemnifying party of the commencement thereof, the indemnifying party shall be entitled to participate therein and, to the extent that it shall wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party), and, after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof, the indemnifying party shall not be liable to such indemnified party under such subsection for any legal expenses of other counsel or any other expenses, in each case subsequently incurred by such indemnified party, in connection with the defense thereof other than reasonable costs of investigation. No indemnifying party shall, without the written consent of the indemnified party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification or contribution may be sought hereunder (whether or not the indemnified party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (i) includes an unconditional release of the indemnified party from all liability arising out of such action or claim and (ii) 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.

(e) If the indemnification provided for in this Section 10 is unavailable to or insufficient to hold harmless an indemnified party under subsection (a), (b) or (c) above in respect of any losses, claims, damages or liabilities (or actions in respect thereof) referred to therein, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (or actions in respect thereof) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Selling Stockholder on the one hand and the Underwriters on the other from the offering of the Shares. If, however, the allocation provided by the immediately preceding sentence is not permitted by applicable law or if the indemnified party failed to give the notice required under subsection (d) above, then each indemnifying party shall contribute to such amount paid or payable by such indemnified party in such proportion as is appropriate to reflect not only such relative benefits but also the relative fault of the Company and the Selling Stockholder on the one hand and the Underwriters on the other in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities (or actions in respect thereof), as well as any other relevant equitable considerations. The relative benefits received by the Company and the Selling Stockholder on the one hand and the

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Underwriters on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (net of underwriting discounts and commissions but before deducting other expenses) received by the Company and the Selling Stockholder bear to the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover page of the Prospectus. The relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or the Selling Stockholder on the one hand or the Underwriters on the other and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Company, the Selling Stockholder and each of the Underwriters agree that it would not be just and equitable if contribution pursuant to this subsection (e) were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this subsection (e). The amount paid or payable by an indemnified party as a result of the losses, claims, damages or liabilities (or actions in respect thereof) referred to above in this subsection (e) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this subsection (e), (i) no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission and (ii) the Selling Stockholder’s obligation to contribute any amount under this subsection (e) is limited in the manner and to the extent set forth in Section 10(b) and the Selling Stockholder shall not be required to contribute any amount in excess of the Selling Stockholder Net Proceeds. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations in this subsection (e) to contribute are several in proportion to their respective underwriting obligations and not joint.

(f) The obligations of the Company and the Selling Stockholder under this Section 10 shall be in addition to any liability that the Company and the Selling Stockholder may otherwise have and shall extend, upon the same terms and conditions, to each officer and director of each Underwriter and each person, if any, who controls any Underwriter within the meaning of the Securities Act and each broker-dealer affiliate of any Underwriter; and the obligations of the Underwriters under this Section 10 shall be in addition to any liability which the respective Underwriters may otherwise have and shall extend, upon the same terms and conditions, to each officer and director of the Company and to each person, if any, who controls the Company or the Selling Stockholder within the meaning of the Securities Act.

11. (a) If any Underwriter shall default in its obligation to purchase the Shares that it has agreed to purchase hereunder at a Time of Delivery, you may in your discretion arrange for you or another party or other parties to purchase such Shares on the terms contained herein. If within thirty-six hours after such default by any Underwriter you do not arrange for the purchase of such Shares, then the Company and the Selling Stockholder shall be entitled to a further period of thirty-six hours within which to procure another party or other parties satisfactory to you to purchase such Shares on such terms. In the event that, within the respective prescribed periods, you notify the Company and the Selling Stockholder that you have so arranged for the purchase of such Shares, or the Company or the Selling Stockholder notifies you that it has so arranged for the purchase of such Shares, you or the Company or the Selling Stockholder shall have the right to postpone such Time of Delivery for a period of not more than seven calendar days, in order to effect whatever changes may thereby be made necessary in the Registration Statement or the Prospectus, or in any other documents or arrangements, and the Company agrees to file promptly any amendments to the Registration Statement or any amendments or supplements to the Prospectus that in your opinion may thereby be made necessary. The term “Underwriter” as used in this Agreement shall include any person substituted under this Section 11 with like effect as if such person had originally been a party to this Agreement with respect to such Shares.

(b) If, after giving effect to any arrangements for the purchase of the Shares of a defaulting Underwriter or Underwriters by you, the Company and the Selling Stockholder as provided in subsection (a) above, the aggregate number of such Shares that remains unpurchased does not exceed one-eleventh of the aggregate number of all the Shares to be purchased at such Time of

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Delivery, then the Company and the Selling Stockholder shall have the right to require each non-defaulting Underwriter to purchase the number of Shares that such Underwriter agreed to purchase hereunder at such Time of Delivery and, in addition, to require each non-defaulting Underwriter to purchase its pro rata share (based on the number of Shares which such Underwriter agreed to purchase hereunder) of the Shares of such defaulting Underwriter or Underwriters for which such arrangements have not been made; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

(c) If, after giving effect to any arrangements for the purchase of the Shares of a defaulting Underwriter or Underwriters by you, the Company and the Selling Stockholder as provided in subsection (a) above, the aggregate number of such Shares that remains unpurchased exceeds one-eleventh of the aggregate number of all of the Shares to be purchased at such Time of Delivery, or if the Company and the Selling Stockholder shall not exercise the right described in subsection (b) above to require non-defaulting Underwriters to purchase Shares of a defaulting Underwriter or Underwriters, then this Agreement (or, with respect to a Second Time of Delivery, the obligations of the Underwriters to purchase and of the Selling Stockholder to sell the Optional Shares) shall thereupon terminate, without liability on the part of any non-defaulting Underwriter or the Company or the Selling Stockholder, except for the expenses to be borne by the Company, the Selling Stockholder and the Underwriters as provided in Section 8 hereof and the indemnity and contribution agreements in Section 10 hereof; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

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

13. If this Agreement shall be terminated pursuant to clauses (i), (iii), (iv) or (v) of Section 9(g) or Section 11 hereof, neither the Company nor the Selling Stockholder shall then be under any liability to any Underwriter except as provided in Sections 8 and 10 hereof; but, if for any other reason, any Shares are not delivered by or on behalf of the Selling Stockholder as provided herein, the Company and the Selling Stockholder will reimburse the Underwriters through you for all reasonable, documented out-of-pocket expenses approved in writing by you, including fees and disbursements of counsel, reasonably incurred by the Underwriters in making preparations for the purchase, sale and delivery of the Shares not so delivered, but the Company and the Selling Stockholder shall then be under no further liability to any Underwriter except as provided in Sections 8 and 10 hereof.

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14. In all dealings hereunder, you shall act on behalf of each of the Underwriters, and the parties hereto shall be entitled to act and rely upon any statement, request, notice or agreement on behalf of any Underwriter made or given by you.

All statements, requests, notices and agreements hereunder shall be in writing, and if to the Underwriters shall be delivered or sent by mail, telex or facsimile transmission to Merrill Lynch, Pierce, Fenner & Smith Incorporated, One Bryant Park, New York, New York 10036, attention of Syndicate Department (facsimile: (646) 855-3073), with a copy to ECM Legal (facsimile: (212) 230-8730); if to the Selling Stockholder shall be delivered or sent by mail, telex or facsimile transmission to 313 Acquisition LLC, c/o Blackstone, 345 Park Ave, New York, New York 10154, attention of Peter Wallace, with a copy to counsel for the Selling Stockholder, Wilson Sonsini Goodrich & Rosati, Professional Corporation, at 650 Page Mill Road, Palo Alto, California 94304, Attention: Robert Day; if to the Company shall be delivered or sent by mail, telex or facsimile transmission to the address of the Company set forth on the cover of the Registration Statement, Attention: Chief Legal Officer; and if to any stockholder that has delivered a lock-up letter described in Section 9(i) hereof shall be delivered or sent by mail to his or her respective address provided in Schedule III hereto or such other address as such stockholder provides in writing to the Company; provided, however, that any notice to an Underwriter pursuant to Section 10(d) hereof shall be delivered or sent by mail, telex or facsimile transmission to such Underwriter at its address set forth in its Underwriters’ Questionnaire or telex constituting such Questionnaire, which address will be supplied to the Company or the Selling Stockholder by you upon request; provided, further, that notices under Section 6(f) and the lock-up agreements referred to in Section 9(i) shall be in writing, and if to the Underwriters shall be delivered or sent by mail, telex or facsimile transmission to Merrill Lynch, Pierce, Fenner & Smith Incorporated, One Bryant Park, New York, New York 10036, attention of Syndicate Department (facsimile: (646) 855-3073), with a copy to ECM Legal (facsimile: (212) 230-8730). Any such statements, requests, notices or agreements shall take effect upon receipt thereof.

In accordance with the requirements of the USA PATRIOT Act, the Underwriters are required to obtain, verify and record information that identifies their respective clients, including the Company and the Selling Stockholder, which information may include the name and address of their respective clients, as well as other information that will allow the Underwriters to properly identify their respective clients.

15. This Agreement shall be binding upon, and inure solely to the benefit of, the Underwriters, the Company and the Selling Stockholder and, to the extent provided in Sections 10 and 12 hereof, the officers and directors of the Company and each person who controls the Company, the Selling Stockholder or any Underwriter, and their respective heirs, executors, administrators, successors and assigns, and no other person shall acquire or have any right under or by virtue of this Agreement. No purchaser of any of the Shares from any Underwriter shall be deemed a successor or assign by reason merely of such purchase.

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

17. The Company and the Selling Stockholder acknowledge and agree that (i) the purchase and sale of the Shares pursuant to this Agreement is an arm’s-length commercial transaction between the Company and the Selling Stockholder, on the one hand, and the several Underwriters, on the other, (ii) in connection therewith and with the process leading to such transaction each Underwriter is

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acting solely as a principal and not the agent or fiduciary of the Company or the Selling Stockholder, (iii) no Underwriter has assumed an advisory or fiduciary responsibility in favor of the Company or the Selling Stockholder with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company or the Selling Stockholder on other matters) or any other obligation to the Company or the Selling Stockholder except the obligations expressly set forth in this Agreement and (iv) the Company and the Selling Stockholder have consulted their own legal and financial advisors to the extent they deemed appropriate. The Company and the Selling Stockholder agree that they will not claim that the Underwriters, or any of them, have rendered advisory services of any nature or respect, or owe a fiduciary or similar duty to the Company or the Selling Stockholder, in connection with such transaction or the process leading thereto.

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

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

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

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

22. Without limiting the applicability of Section 3 hereof or any other provision of this Agreement, with respect to any Underwriter who is affiliated with any person or entity engaged to act as an investment adviser on behalf of a client who has a direct or indirect interest in the Shares being sold by the Selling Stockholder, the Shares being sold to such Underwriter shall not include any shares of Common Stock attributable to such client (with any such shares instead being allocated and sold to the other Underwriters) and, accordingly, the fees or other amounts received by such Underwriter in connection with the transactions contemplated hereby shall not include any fees or other amounts attributable to such client.

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

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

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Signature Page to Underwriting Agreement

Signature Page to Underwriting Agreement

For itself and as representative of the other Underwriters named in Schedule I hereto

Signature Page to Underwriting Agreement

SCHEDULE I

SCHEDULE II

None

None

The public offering price per share for the Shares is $5.50.

The number of Firm Shares to be sold is 8,000,000.

The Selling Stockholder has granted an option to the Underwriters to purchase up to an additional 1,200,000 shares of Common Stock.

None

SCHEDULE III

SCHEDULE IV

ANNEX I

FORMS OF OPINION OF

COUNSEL FOR THE COMPANY AND THE SELLING STOCKHOLDER

ANNEX II

Vivint Solar, Inc.

Lock-Up Agreement

            , 2018

Merrill Lynch, Pierce, Fenner & Smith

Incorporated

As representative of the several Underwriters

One Bryant Park

New York, NY 10036

    Re: Vivint Solar, Inc. — Lock-Up Agreement

Ladies and Gentlemen:

The undersigned understands that Merrill Lynch, Pierce, Fenner & Smith Incorporated (“Merrill Lynch”), as representative, proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) on behalf of the several underwriters named in Schedule I to such agreement (collectively, the “Underwriters”), with Vivint Solar, Inc., a Delaware corporation (the “Company”), and 313 Acquisition LLC, a Delaware limited liability company (the “Selling Stockholder”), providing for a public offering (the “Offering”) of shares (the “Shares”) of the common stock, $0.01 par value, of the Company (the “Common Stock”), pursuant to a Registration Statement on Form S-3 filed with the Securities and Exchange Commission (the “SEC”).

In consideration of the agreement by the Underwriters to offer and sell the Shares, and of other good and valuable consideration the receipt and sufficiency of which is hereby acknowledged, the undersigned agrees that, during the period specified in the following paragraph (the “Stockholder Lock-Up Period”), the undersigned will not offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of any shares of Common Stock, or any options or warrants to purchase any shares of Common Stock, or any securities convertible into, exchangeable for or that represent the right to receive shares of Common Stock, whether now owned or hereafter acquired, owned directly by the undersigned (including holding as a custodian) or with respect to which the undersigned has beneficial ownership within the rules and regulations of the SEC (collectively the “Undersigned’s Shares”) other than any Shares sold to the Underwriters pursuant to the Underwriting Agreement or as otherwise provided herein. The foregoing restriction is expressly agreed to preclude the undersigned from engaging in any hedging or other transaction which is designed to or which reasonably could be expected to lead to or result in a sale or disposition of the Undersigned’s Shares even if such shares would be disposed of by someone other than the undersigned. Such prohibited hedging or other transactions would include without limitation any short sale or any purchase, sale or grant of any right (including without limitation any put or call option) with respect to any of the Undersigned’s Shares or with respect to any security that includes, relates to, or derives any significant part of its value from such shares.

The Stockholder Lock-Up Period will commence on the date of this Lock-Up Agreement and continue for 60 days after the date set forth on the final prospectus supplement (the “Prospectus”) used to sell the Shares (the “Offering Date”) pursuant to the Underwriting Agreement.

Notwithstanding the foregoing, the undersigned may:

(a) transfer the Undersigned’s Shares:

(i) as a bona fide gift or gifts;

(ii) 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, if the undersigned is a trust, to a trustor or beneficiary of the trust or to the estate of a beneficiary of such trust;

(iii) by will or the laws of descent (including transfers to a nominee or custodian in connection therewith);

(iv) in connection with transactions by any person other than the Company relating to Common Stock acquired in open market transactions after the Offering Date, provided that in the case of this clause (iv) no public reports or filings (including under Section 16 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) reporting a reduction in beneficial ownership of shares of Common Stock shall be required or voluntarily made during the Stockholder Lock-Up Period;

(v) if the undersigned is a corporation, limited liability company, partnership or other business entity, (A) to another corporation, limited liability company, partnership or other business entity that controls, is controlled by or managed by or is under common control with the undersigned or (B) as part of a distribution to any stockholder, member or limited partner of the undersigned or to the estate of any such stockholder, member or limited partner;

(vi) to the undersigned’s affiliates or to any investment fund or other entity controlled or managed by the undersigned;

(vii) to a nominee or custodian of a person or entity to whom a disposition or transfer would be permissible under clauses (i), (ii), (iv), (v) and (vi) above;

(viii) to the Company, as forfeitures to satisfy any income, employment or tax withholding and remittance obligations of the undersigned or the employer of the undersigned in connection with the vesting of restricted stock, restricted stock units or other incentive awards settled in shares of Common Stock held by the undersigned, provided that such restricted stock, restricted stock units or other incentive awards (A) are outstanding as of the date of the Prospectus and (B) were issued pursuant to an employee benefit plan disclosed in the Prospectus;

(ix) to the Company, in connection with the receipt of shares of Common Stock upon the “net” or “cashless” exercise of options to purchase shares of Common Stock for purposes of exercising such options, including the payment of taxes due as a result of such exercise, with respect to stock options outstanding as of the date of the Prospectus and described therein, provided that any such shares of Common Stock received upon such exercise shall be subject to the terms of this Lock-Up Agreement;

(x) to the Company or its parent entities, in connection with the repurchase or forfeiture of shares of Common Stock issued pursuant to an employee benefit plan disclosed in the Prospectus or pursuant to the agreements pursuant to which such shares were issued;

(xi) pursuant to a bona fide third-party tender offer, merger, consolidation or other similar transaction made to all holders of the Company’s capital stock involving a change of control of the Company, provided that in the event that such tender offer, merger, consolidation or other such transaction is not completed, the Undersigned’s Shares shall remain subject to the provisions of this Lock-Up Agreement;

(xii) pursuant to an order of a court or regulatory agency;

(xiii) pursuant to a trading plan existing on the date hereof that satisfies all of the requirements of Rule 10b5-1 of the Exchange Act; or

(xiv) with the prior written consent of Merrill Lynch on behalf of the Underwriters;

provided, however, that (1) in the case of subclauses (i), (ii), (v), (vi) and (vii) it shall be a condition to the transfer or distribution that (Y) each transferee, donee, trustee or distributee shall execute an agreement stating that such transferee, donee, trustee or distributee is receiving and holding such capital stock subject to the provisions of this Lock-Up Agreement and there shall be no further transfer of such capital stock except in accordance with this Lock-Up Agreement and (Z) any such transfer or distribution shall not involve a disposition for value, other than with respect to any such transfer or disposition for which the transferor or distributor receives (a) equity interests of such transferee or (b) such transferee’s interests in the transferor; and (2) in the case of subclauses (i), (ii), (iii), (v), (vi) and (vii) it shall be a condition to the transfer or distribution that (X) no public reports or filings (including under Section 16 of the Exchange Act) reporting a reduction in beneficial ownership of shares of Common Stock shall be voluntarily made during the Stockholder Lock-Up Period in connection with such transfer or distribution, (Y) if any public reports or filings (including under Section 16 of the Exchange Act) reporting a reduction in beneficial ownership of shares of Common Stock shall be required during the Stockholder Lock-Up Period in connection with such transfer or distribution, the undersigned shall provide Merrill Lynch prior written notice informing them of such report or filing and (Z) other than with respect to transfers pursuant to clause (iii), such report or filing shall disclose that such transferee, donee, trustee or distributee, as the case may be, agrees to be bound in writing by the restrictions set forth herein; and

(b) enter into a written plan meeting the requirements of Rule 10b5-1 under the Exchange Act after the date of this Lock-Up Agreement relating to the sale of the Undersigned’s Shares, provided that (i) the securities subject to such plan may not be sold until after the expiration of the Stockholder Lock-Up Period and (ii) no public announcement or filing under the Exchange Act shall be required or voluntarily made by any person in connection therewith other than general disclosure in Company periodic reports to the effect that the Company’s directors and officers may enter into such trading plans from time to time.

For purposes of this Lock-Up Agreement, “immediate family” shall mean any relationship by blood, marriage, domestic partnership or adoption, not more remote than first cousin. The undersigned now has, and, except as contemplated by clause (a) above or as described in the Prospectus, for the duration of this Lock-Up Agreement will have, valid title to the Undersigned’s Shares, free and clear of all liens, encumbrances, and claims whatsoever. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the Undersigned’s Shares except in compliance with the foregoing restrictions.

Notwithstanding anything to the contrary contained herein, this Lock-Up Agreement will automatically terminate and the undersigned will be released from all of his, her or its obligations hereunder upon the earliest to occur, if any, if (i) the Company advises Merrill Lynch in writing that it has determined not to proceed with the Offering, (ii) the Company files an application to withdraw the registration statement related to the Offering, (iii) the Underwriting Agreement (other than the provisions thereof that survive termination) shall terminate or be terminated prior to payment for and delivery of the shares of Common Stock to be sold thereunder, and (iv) as of December 31, 2018, the Underwriting Agreement has not been executed.

The undersigned hereby consents to receipt of this Lock-Up Agreement in electronic form and understands and agrees that this Lock-Up Agreement may be signed electronically. In the event that any signature is delivered by facsimile transmission, electronic mail, or otherwise by electronic transmission evidencing an intent to sign this Lock-Up Agreement, such facsimile transmission, electronic mail or other electronic transmission shall create a valid and binding obligation of the undersigned with the same force and effect as if such signature were an original. Execution and delivery of this Lock-Up Agreement by facsimile transmission, electronic mail or other electronic transmission is legal, valid and binding for all purposes.

The undersigned understands that the Company and the Underwriters are relying upon this Lock-Up Agreement in proceeding toward consummation of the Offering. The undersigned further understands that this Lock-Up Agreement is irrevocable and shall be binding upon the undersigned’s heirs, legal representatives, successors, and assigns. This Lock-Up Agreement and any claim, controversy or dispute arising under or related to this Lock-Up Agreement shall be governed by and construed in accordance with the laws of the State of New York.