Exhibit 1.1

EXECUTION VERSION

5,833,333 Shares

Vitae Pharmaceuticals, Inc.

Common Stock

UNDERWRITING AGREEMENT

March 24, 2016

PIPER JAFFRAY & CO.

BMO CAPITAL MARKETS CORP.

As representatives of the several Underwriters
named in Schedule I hereto

c/o Piper Jaffray & Co.

800 Nicollet Mall

Minneapolis, Minnesota 55402

and

c/o BMO Capital Markets Corp.

3 Times Square

New York, New York 10036

Ladies and Gentlemen:

Vitae Pharmaceuticals, Inc., a Delaware corporation (the “Company”), proposes to issue and sell to the several underwriters named in Schedule I hereto (the “Underwriters”) for whom Piper Jaffray & Co. (“PJC”) and BMO Capital Markets Corp. (“BMO” collectively with PJC, the “Representatives”) are acting as representatives, an aggregate of 5,833,333 shares (the “Firm Shares”) of the common stock, par value $0.0001 per share, of the Company (“Common Stock”). The Company also proposes to sell to the several Underwriters, at the option of the Underwriters, up to an additional 875,000 shares of Common Stock (the “Option Shares”). The Firm Shares and the Option Shares are hereinafter referred to collectively as the “Shares.”

The Company confirms as follows its agreements with the Representatives and the several other Underwriters.

1. The Company represents and warrants to, and agrees with, each of the Underwriters that, as of the date hereof and as of the Closing Date and each Option Closing Date, if any:

(i) The Company has prepared and filed with the Securities and Exchange Commission (the “Commission”) a registration statement on Form S-3 (File No. 333-

207290), and such amendments to such registration statement as may have been required to the date of this Agreement, under the Securities Act of 1933, as amended (the “Securities Act”), and the rules and regulations (the “Rules and Regulations”) of the Commission thereunder. Such registration statement, at any given time, including any amendments thereto to such time, and the Rule 462(b) Registration Statement (as defined below), if any, the exhibits and any schedules thereto at such time, the information contained in the form of final prospectus filed with the Commission pursuant to Rule 424(b) under the Securities Act and deemed by virtue of Rule 430B under the Securities Act to be part of the Initial Registration Statement (as defined below) at the time it was declared effective or such part of the Rule 462(b) Registration Statement, if any, the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the Securities Act at such time and the documents and information otherwise deemed to be a part thereof or included therein by Rule 430B under the Securities Act (the “Rule 430B Information”) or otherwise pursuant to the Rules and Regulations at such time, is herein called the “Registration Statement.” The Registration Statement at the time it originally became effective is herein called the “Initial Registration Statement.”

The prospectus in the form in which it appeared in the Initial Registration Statement is herein called the “Base Prospectus.” Each preliminary prospectus supplement to the Base Prospectus (including the Base Prospectus as so supplemented) that described the Shares and the offering thereof, that omitted the Rule 430B Information and that was used prior to the filing of the final prospectus supplement referred to in the following sentence is hereinafter called a “Preliminary Prospectus.” The Preliminary Prospectus relating to the Shares that was included in the Registration Statement immediately prior to the Applicable Time (as defined in Section 1(iv) hereof) is hereinafter called the “Pricing Prospectus.” Promptly after the execution and delivery of this Agreement, the Company will prepare and file with the Commission a final prospectus supplement to the Base Prospectus relating to the Shares and the offering thereof in accordance with the provisions of Rule 430B and Rule 424(b) of the Rules and Regulations. Such final supplemental form of prospectus (including the Base Prospectus as so supplemented) in the form filed with the Commission pursuant to Rule 424(b) under the Securities Act is hereinafter called the “Prospectus.” Any “issuer free writing prospectus” as defined in Rule 433 under the Securities Act relating to the Shares is hereinafter called the “Issuer Free Writing Prospectus.” Any reference herein to the Base Prospectus, any Preliminary Prospectus, the Pricing 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 under the Securities Act as of the date of such prospectus.

For purposes of this Agreement, all references to the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus, the Prospectus or any amendment or supplement to any of the foregoing shall be deemed to include the copy filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval System (“EDGAR”). All references in this Agreement to financial statements and schedules and other information that is “described,” “contained,” “included” or “stated” in the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus (or other references of like import) shall be deemed to mean and include all such financial statements and schedules and other information that is incorporated by reference in or otherwise deemed by the Rules and Regulations to be a part of or included in the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus

or the Prospectus, as the case may be. Except as specifically noted, all references in this Agreement to amendments or supplements to the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus shall be deemed to mean and include the subsequent filing of any document under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and which is deemed to be incorporated by reference therein or otherwise deemed by the Rules and Regulations to be a part thereof. At the time of the filing of the Initial Registration Statement with the Commission, the conditions for use of Form S-3, set forth in the General Instructions thereto, were satisfied. The Initial Registration Statement was declared effective by the Commission under the Securities Act on November 5, 2015. Other than a registration statement, if any, increasing the size of the offering (a “Rule 462(b) Registration Statement”), filed pursuant to Rule 462(b) under the Securities Act, which became effective upon filing, no other document with respect to the Initial Registration Statement has heretofore been filed with the Commission. No stop order suspending the effectiveness of the Registration Statement, any post-effective amendment thereto or the Rule 462(b) Registration Statement, if any, has been issued, no proceeding for that purpose has been initiated or threatened by the Commission. Any request on the part of the Commission for additional information from the Company has been satisfied in all material respects;

(ii) The Registration Statement, any Rule 462(b) Registration Statement and any post-effective amendments thereto, at the time that it became effective (including each deemed effective date with respect to the Underwriters pursuant to Rule 430B or otherwise under the Securities Act), at all other subsequent times until and including the Closing Date (as defined herein) (and, if any Option Shares are purchased, at each Option Closing Date) (as defined herein)), and the Prospectus, at the time of filing or the time of first use within the meaning of the Rules and Regulations, at all subsequent times until and including the Closing Date and the Option Closing Date, as applicable, and at the Closing Date and Option Closing Date, as applicable, complied and will comply in all material respects with the requirements of the Securities Act, the Rules and Regulations and the Exchange Act, and did not 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 in order to make the statements therein not misleading. The Prospectus, as amended or supplemented, as of its date, or the time of first use within the meaning of the Rules and Regulations, at all subsequent times until and including the Closing Date and the Option Closing Date, as applicable, and at the Closing Date and the Option Closing Date, as applicable, did not and will not include an untrue statement of a material fact or omitted or will omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The representations and warranties in set forth in the two immediately preceding sentences do not apply to statements in or omissions from the Registration Statement or the Prospectus made in reliance upon and in strict conformity with information furnished to the Company in writing by any Underwriter through the Representatives or the Representatives’ counsel expressly for use in the Registration Statement or the Prospectus, it being understood and agreed that the only such information provided by any Underwriter is that described as such in Section 9(b) hereof (the “Underwriter Information”). No order preventing or suspending the use of any Preliminary Prospectus, the Pricing Prospectus or any Issuer Free Writing Prospectus has been issued by the Commission. The documents incorporated by reference in any Preliminary Prospectus or the Prospectus complied, and any further documents so incorporated will comply, when filed with the Commission, in all material respects to the requirements of the Exchange Act or the Securities Act, as applicable, and the

Rules and Regulations. The documents incorporated by reference in any Preliminary Prospectus or the Prospectus did not, and any further documents filed and incorporated by reference therein will not, when filed with the Commission, contain an untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading. The Pricing Prospectus complied, and the Prospectus will comply, in all material respects when filed with the Commission pursuant to Rule 424(b) under the Securities Act and on the Closing Date and the Option Closing date, as applicable, to the requirements of the Securities Act and the Rules and Regulations;

(iii) Each Preliminary Prospectus, Pricing Prospectus, Issuer Free Writing Prospectus and the Prospectus filed as part of the Initial Registration Statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 under the Securities Act, complied when so filed in all material respects with the requirements of the Securities Act, the Rules and Regulations and the Exchange Act, and each Preliminary Prospectus, Pricing Prospectus, Issuer Free Writing Prospectus and the Prospectus delivered to the Underwriters for use in connection with this offering was identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T;

(iv) For the purposes of this Agreement, the “Applicable Time” is 9 a.m. (Eastern time) on the date of this Agreement; at the Applicable Time the Pricing Prospectus, as supplemented by the Issuer Free Writing Prospectus, if any, listed on Schedule II hereto, and the other information listed on Schedule II hereto (collectively, the “Pricing Disclosure Package”) 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, if any, as such may have been supplemented or amended, as of its issue date and at all subsequent times through the period in which the Prospectus is required to be delivered in connection with sales of Shares under the Securities Act or the Exchange Act (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act) (the “Prospectus Delivery Period”) does not conflict with the information contained in the Registration Statement, the Pricing Prospectus 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, did not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that this representation and warranty shall not apply to statements or omissions made in an Issuer Free Writing Prospectus in reliance upon and in conformity with the Underwriter Information;

(v) The Company has filed a registration statement pursuant to the Exchange Act to register the Common Stock, and such registration statement is effective. 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;

(vi) From the time of initial filing of the Registration Statement with the Commission (or, if earlier, the first date on which the Company engaged directly or through any Person authorized to act on its behalf in any Testing-the-Waters Communication (as defined

below)) 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”);

(vii) The Company is 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 or lease all the assets owned or leased by it and conduct its business as described in the Registration Statement, the Pricing Disclosure Package and the Prospectus and to enter into and perform its obligations under this Agreement, and is qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it owns or leases properties or conducts any business so as to require such qualification, except where the failure so to qualify or be in good standing would not have, or reasonably be expected to result in, a material adverse effect on the business, prospects, management, financial position, stockholders’ equity or results of operations of the Company (a “Material Adverse Effect”);

(viii) The Company does not have any subsidiaries and does not own or control, directly or indirectly, any corporation, association or other entity;

(ix) The Company has an authorized equity capitalization as set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus under the headings “Capitalization” and “Description of Capital Stock,” and all of the issued and outstanding shares of capital stock of the Company have been duly authorized and validly issued, are fully paid and non-assessable and conform to the descriptions thereof contained in the Registration Statement, the Pricing Disclosure Package and the Prospectus; and none of the issued and outstanding shares of capital stock of the Company are subject to any preemptive or similar rights;

(x) The Shares have been duly authorized and, when issued and delivered to and paid for by the Underwriters in accordance with the terms of this Agreement, will be validly issued and fully paid and non-assessable and will conform to the descriptions thereof contained in the Pricing Prospectus; and the issuance of such Shares is not subject to any preemptive or similar rights which have not been waived;

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

(xii) The issue and sale of the Shares, the execution of this Agreement by the Company, the compliance by the Company with all of the provisions of this Agreement and the consummation of the transactions herein contemplated will not (1) 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 or other agreement or instrument to which the Company is a party or by which the Company is bound or to which any of the property or assets of the Company is subject, (2) result in any violation of the provisions of the certificate of incorporation or by-laws (or other organization documents) of the Company or (3) 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 properties, except, in the case of clauses (1) and (3), for any such conflict, violation, breach or default that would not have, or reasonably

be expected to result in, 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 and sale of the Shares or the consummation by the Company of the transactions contemplated by this Agreement, except such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or Blue Sky laws or the rules and regulations of the Financial Industry Regulatory Authority (“FINRA”) in connection with the purchase and distribution of the Shares by the Underwriters;

(xiii) Ernst & Young LLP, who have certified certain financial statements of the Company, are independent public accountants as required by the Securities Act, the Rules and Regulations and the Public Company Accounting Oversight Board (United States). The financial statements, together with related schedules and notes, included in the Registration Statement, the Pricing Disclosure Package and the Prospectus comply in all material respects with the requirements of the Securities Act and present fairly in all material respects the financial position, results of operations and changes in financial position of the Company on the basis stated in the Registration Statement at the respective dates or for the respective periods to which they apply; such financial statements and related schedules and notes have been prepared in accordance with U.S. generally accepted accounting principles consistently applied throughout the periods involved, except as disclosed therein; and the selected financial data and the summary financial data included in the Registration Statement, the Pricing Disclosure Package or the Prospectus present fairly the information shown therein and have been compiled on a basis consistent with that of the financial statements included in the Registration Statement. The interactive data in eXtensible Business Reporting Language included or incorporated by reference in the Registration Statement fairly present the information called for in all material respects and have been prepared in accordance with the Commission’s rules and guidelines applicable thereto;

(xiv) The Company has not sustained, since the date of the latest audited financial statements included or incorporated by reference in the Pricing Disclosure Package, 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, the Pricing Disclosure Package and the Pricing Prospectus, (1) there has not been any change in the capital stock (other than the issuance of shares of Common Stock upon the exercise or conversion of securities, or the grant of options, restricted stock or other equity based awards under the Company’s existing equity incentive plans, in each case as described in the Pricing Disclosure Package) or long-term debt of the Company, (2) there has not been any Material Adverse Effect, or any development that would reasonably be expected to result in a Material Adverse Effect, (3) there have been no transactions entered into by, and no obligations or liabilities, contingent or otherwise, incurred by the Company whether or not in the ordinary course of business which are material to the Company, or (4) there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock, in each case, otherwise than as set forth or contemplated in the Pricing Disclosure Package;

(xv) The Company is not (1) in violation of its certificate of incorporation or bylaws or (2) in violation of any law, ordinance, administrative or governmental

rule or regulation applicable to the Company, or (3) in violation of any decree of any court or governmental agency or body having jurisdiction over the Company, or (4) in default in the performance of any obligation, agreement or condition contained in any bond, debenture, note or any other evidence of indebtedness or in any agreement, indenture, lease or other instrument to which the Company is a party or by which it or any of its properties may be bound, except, in the case of clauses (2), (3) and (4), where any such violation or default, individually or in the aggregate, would not have, or reasonably be expected to result in, a Material Adverse Effect;

(xvi) The Company has good and marketable title to all real and tangible property described in the Pricing Prospectus as being owned by it, in each case free and clear of all liens or encumbrances except such as are described in the Registration Statement, the Pricing Disclosure Package or the Prospectus or are not material to the business of the Company; and any real property and buildings described in the Registration Statement, the Pricing Disclosure Package or the Prospectus as being held under lease by the Company are held under valid, subsisting and enforceable leases with such exceptions as are not material and do not materially interfere with the use made and proposed to be made of such property and buildings by the Company;

(xvii) Other than as set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus, there are no legal or governmental proceedings pending to which the Company is a party or, to the Company’s knowledge, of which any property of the Company is the subject which, if determined adversely to the Company, individually or in the aggregate, would have, or reasonably be expected to result in, a Material Adverse Effect, or would prevent or materially impair the consummation of the transactions contemplated by this Agreement, or which are required to be described in the Registration Statement or the Pricing Disclosure Package; and, to the Company’s knowledge, no such proceedings are threatened or contemplated by governmental authorities or others;

(xviii) Other than as set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus, the Company possesses all permits, licenses, approvals, consents and other authorizations, excluding Authorizations (as defined and covered by Section (xxxviii) below) (collectively, “Permits”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies necessary to conduct its business; the Company is in compliance with the terms and conditions of all such Permits and all of the Permits are valid and in full force and effect, except, in each case, where the failure so to comply or where the invalidity of such Permits or the failure of such Permits to be in full force and effect, individually or in the aggregate, would not have, or reasonably be expected to result in, a Material Adverse Effect; and the Company has not received any written notice or, to the Company’s knowledge, any oral notice of proceedings relating to the revocation or material modification of any such Permits;

(xix) (1) The Company (A) owns or possesses a valid, enforceable right or license to use all inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks and trade names, and patent rights (collectively “Intellectual Property”) necessary to carry on its business as described in the Registration Statement, the Pricing Disclosure Package or the Prospectus (“Company Intellectual Property”), without any conflict with or infringement of any third party Intellectual Property rights, (B) has taken

commercially reasonable steps necessary to secure its ownership interests in such Company Intellectual Property, including taking commercially reasonable steps (i) necessary to secure assignment of Company Intellectual Property purported to be owned by the Company from its past and present employees and contractors and (ii) to preserve and maintain the confidentiality of any confidential or proprietary information included within the Company Intellectual Property; (2) the Company is not a party to or bound by any options, licenses or agreements with respect to the Intellectual Property of any other person or entity that are required to be set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus but are not included therein; (3) none of the technology employed by the Company has been obtained or is being used by the Company in violation of any contractual obligation binding on the Company or, to the Company’s knowledge, any of its directors or executive officers or any of its employees or, to the Company’s knowledge, otherwise in violation of the contractual rights of any persons; (4) the Company has not received any correspondence relating to any Company Intellectual Property or notice of infringement of or conflict with asserted rights of others with respect to any third party Intellectual Property which would render any Company Intellectual Property invalid or inadequate to protect the interest of the Company and which infringement or conflict (if the subject of any unfavorable decision, ruling or finding) or invalidity or inadequacy, individually or in the aggregate, would have, or reasonably be expected to result in, a Material Adverse Effect; and (5) the Company has taken and will use commercially reasonable efforts to maintain measures to prevent the unauthorized dissemination or publication of its confidential information and, to the extent contractually required to do so, the confidential information of third parties in its possession;

(xx) No material labor dispute with the employees of the Company exists, or, to the knowledge of the Company, is imminent. The Company is not aware of any existing or imminent labor disturbance by the employees of any of its or principal suppliers, manufacturers, customers or contractors which, individually or in the aggregate, would have, or reasonably be expected to result in, a Material Adverse Effect;

(xxi) The Company is insured by insurers of recognized financial responsibility against such losses and risks (including without limitation risks related to clinical trials and product liability) and in such amounts as are customary for businesses at a similar stage in the industry in which it is engaged; the Company has not been refused any insurance coverage sought or applied for; and the Company has no reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not have, or reasonably be expected to result in, a Material Adverse Effect;

(xxii) The Company has made and keeps books, records and accounts, which, in reasonable detail, accurately and fairly reflect in all material respects the transactions and dispositions of the assets of the Company. The Company maintains a system of internal accounting controls sufficient to provide reasonable assurances that (1) transactions are executed in accordance with management’s general or specific authorizations; (2) transactions are recorded as necessary to permit preparation of financial statements in conformity with U.S. generally accepted accounting principles and to maintain accountability for assets; (3) access to assets is permitted only in accordance with management’s general or specific authorization; and (4) the recorded accountability for assets is compared with the existing assets at reasonable

intervals and appropriate action is taken with respect to any differences and (5) the interactive data in eXtensible Business Reporting Language included or incorporated by reference in the Registration Statement is in conformity with U.S. generally accepted accounting principles and is updated as necessary to comply in all material respects with the requirements of the Securities Act, the Rules and Regulations and guidelines applicable thereto and the Exchange Act and present fairly the consolidated financial position, results of operations and changes in financial position of the Company on the basis stated in the Registration Statement at the respective dates or for the respective periods to which they apply;

(xxiii) Since the date of the latest audited financial statements included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus, (a) the Company has not been advised of (1) any significant deficiencies in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the ability of the Company to record, process, summarize and report financial data, or any material weaknesses in internal controls or (2) any fraud, whether or not material, that involves management or other employees who have a significant role in the internal controls of the Company, and (b) since that date, there has been no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting;

(xxiv) The Company maintains disclosure controls and procedures (as such term is defined in Rule 13a-15 (e) of the Exchange Act) that comply with the requirements of the Exchange Act; such disclosure controls and procedures are effective in all material respects to perform the functions for which they were established;

(xxv) All U.S. federal, state, and foreign income and franchise tax returns and other material returns of the Company required by law to be filed have been filed and such tax returns are true, complete and correct in all material respects. All material taxes required to be paid by the Company, and any related or similar assessments, fines or penalties levied, which are due and payable, have been paid, except assessments against which appeals have been or will be promptly taken and as to which adequate reserves in conformity with U.S. generally accepted accounting principles have been provided. The charges, accruals and reserves on the books of the Company in respect of any income and corporation tax liability for any years not finally determined are in conformity with U.S. generally accepted accounting principles and are adequate in all material respects to meet any assessments or re-assessments for additional income tax for any years not finally determined;

(xxvi) There are no statutes, regulations, documents or contracts of a character required to be described in the Registration Statement, the Pricing Disclosure Package or the Prospectus or to be filed as an exhibit to the Registration Statement which are not described or filed as required;

(xxvii) The Company is not in violation of any statute or any rule, regulation, decision or order of any governmental agency or body or any court, domestic or foreign, relating to the use, production, disposal or release of substances or relating to the protection or restoration of the environment or human exposure to hazardous or toxic substances (collectively, “environmental laws”), does not own or operate any real property contaminated

with any substance that is subject to any environmental laws, is not liable for any off-site disposal or contamination pursuant to any environmental laws, and is not subject to any claim relating to any environmental laws, which violation, contamination, liability or claim, individually or in the aggregate, would not have, or reasonably be expected to result in, a Material Adverse Effect; and the Company is not aware of any pending investigation which would reasonably be expected to lead to such a claim;

(xxviii) Each employee benefit plan, within the meaning of Section 3(3) of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), that is maintained, administered or contributed to by the Company for employees or former employees of the Company and its affiliates has been maintained in compliance with its terms and the requirements of any applicable statutes, orders, rules and regulations, including but not limited to ERISA and the Internal Revenue Code of 1986, as amended (the “Code”), except to the extent that failure to so comply, individually or in the aggregate, would not have, or reasonably be expected to result in, a Material Adverse Effect. No prohibited transaction, within the meaning of Section 406 of ERISA or Section 4975 of the Code has occurred with respect to any such plan excluding transactions effected pursuant to a statutory or administrative exemption;

(xxix) Neither the Company, any director, officer, nor, to the Company’s knowledge, agent, or employee of the Company or other person acting on behalf of the Company, has (1) used any corporate funds of the Company for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity; (2) made any direct or indirect unlawful payment to any foreign or domestic government official or employee from corporate funds of the Company, (3) violated or is in violation of any provision of the Foreign Corrupt Practices Act of 1977, as amended, the UK Bribery Act 2010 or any applicable law or regulation implementing the OECD Convention on Combating Bribery of Foreign Public Officials in International Business Transactions, or committed an offense under any applicable anti-bribery or anti-corruption laws or (4) made, offered, agreed, requested or taken an act in furtherance of any bribe, unlawful rebate, payoff, influence payment, kickback or other unlawful payment;

(xxx) Neither the Company any director, officer, nor, to the Company’s knowledge, agent, employee or affiliate of the Company is currently subject to or target of any sanctions administered and enforced by the U.S. Government (including, without limitation, the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”) or the U.S. Department of State and including, without limitation, the designation as a “specially designated national” or “blocked person”), the United Nations Security Council, the European Union, Her Majesty’s Treasury or other relevant sanctions authority (collectively, “Sanctions”), nor is the Company located, organized or resident in a country or territory that is the subject or the target of Sanctions, including, without limitation, Cuba, Iran, North Korea, Sudan and Syria (each, a “Sanctioned Country”); and the Company 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 or entity, (i) to fund or facilitate any activities of or business with any person that, at the time of such funding or facilitation, is the subject or the target of Sanctions, (ii) to fund or facilitate any activities of or business in any Sanctioned Country or (iii) in any other manner that will result in a violation by any person (including any person participating in the transaction, whether as underwriter, advisor, investor or otherwise) of

Sanctions. For the past five years, the Company has not knowingly engaged in, is not now knowingly engaged in, and will not engage in, any dealings or transactions with any person that at the time of the dealing or transaction is or was the subject or the target of Sanctions or with any Sanctioned Country. The Company has instituted, maintained and enforced, and will continue to maintain and enforce, policies and procedures designed to promote and ensure compliance with all applicable anti-bribery and anti-corruption laws;

(xxxi) The operations of the Company are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements, including those of the Currency and Foreign Transactions Reporting Act of 1970, as amended, 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 (USA PATRIOT Act), and the applicable money laundering statutes of all jurisdictions in which 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 or regulatory agency (collectively, the “Money Laundering Laws”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened;

(xxxii) There is and has been no failure on the part of the Company or any of the Company’s directors or officers, in their capacities as such, to comply with any provision of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith and with which the Company or such persons are required to comply, including Section 402 related to loans and Sections 302 and 906 related to certifications. The Company has taken all reasonable and necessary actions to ensure that it is in compliance with all provisions of the Sarbanes-Oxley Act that are in effect and with which the Company is required to comply, and it is actively taking commercially reasonable steps to ensure that it will comply in a timely manner with other provisions of the Sarbanes-Oxley Act not currently in effect or which the Company is not currently required to comply with;

(xxxiii) There are no persons with registration rights or other similar rights to have securities registered pursuant to the Registration Statement or otherwise registered by the Company under the Securities Act, except for rights that have been waived by such persons, have expired or have been fulfilled by registration prior to the date of this Agreement;

(xxxiv) The Company is not and, after giving effect to the issuance and sale of the Shares as contemplated herein and the application of the net proceeds therefrom as described in the Registration Statement, the Pricing Disclosure Package and the Prospectus, will not be an “investment company,” as such term is defined in the Investment Company Act of 1940, as amended (the “Investment Company Act”);

(xxxv) The Company has not distributed and, prior to the later to occur of the Closing Date (as defined in Section 4 hereof) and completion of the Underwriters’ distribution of the Shares, will not distribute any offering materials in connection with the offering and sale of the Shares, other than the Pricing Disclosure Package, the Prospectus and, subject to compliance with Section 6 hereof, any Issuer Free Writing Prospectus; and the

Company has not taken and will not take, directly or indirectly, any action designed to cause or result in, or which constitutes or would reasonably be expected to constitute, the stabilization or manipulation of the price of any security of the Company to facilitate the sale of the Shares. The Company has not alone engaged in any Testing-the-Waters Communications and has not distributed any Written Testing-the-Waters Communications in connection with the offering and sale of the Shares. “Testing-the-Waters Communication” means any oral or written communication with potential investors undertaken in reliance on Section 5(d) of the Securities Act. “Written Testing-the-Waters Communication” means any Testing-the-Waters Communication that is a written communication within the meaning of Rule 405 under the Securities Act;

(xxxvi) Nothing has come to the attention of the Company that has caused the Company to believe that the statistical and market and industry-related data included in the Registration Statement, the Pricing Disclosure Package and the Prospectus are not based on or derived in good faith from sources which the Company believes to be reliable and accurate in all material respects and the Company has obtained the written consent to the use of such data from sources to the extent required;

(xxxvii) To the Company’s knowledge, there are no affiliations or associations between any member of FINRA and any of the Company’s officers, directors or 5% or greater security holders, except as set forth in the Registration Statement or Pricing Disclosure Package;

(xxxviii) The Common Stock is registered pursuant to Section 12(b) of the Exchange Act and listed on The NASDAQ Global Market (“NASDAQ”), and the Company has taken no action designed to, or likely to have the effect of, terminating the registration of its Common Stock under the Exchange Act or delisting the Common Stock from NASDAQ, nor has the Company received any notification that the Commission or NASDAQ is contemplating terminating such registration or listing. To the Company’s knowledge, it is in material compliance with all applicable listing requirements of NASDAQ;

(xxxix) There are no relationships or related party transactions involving the Company or any other person required to be described in the Registration Statement, the Pricing Disclosure Package or the Prospectus that have not been described as required under the Securities Act;

(xl) Except as described in the Registration Statement, the Pricing Disclosure Package and the Prospectus, and except as would not, individually or in the aggregate, have, or reasonably be expected to result in, a Material Adverse Effect: (1) the Company has not received any warning letter, untitled letter or other written correspondence or notice from the U.S. Food and Drug Administration, or any other court or arbitrator or federal, state, local or foreign governmental or regulatory authority, alleging or asserting noncompliance with the Federal Food, Drug and Cosmetic Act (21 U.S.C. § 301 et seq.) (the “FFDCA”), or similar law; (2) the Company is and since January 1, 2011 has been in compliance with applicable health care laws, including without limitation, the FFDCA, the federal Anti-Kickback Statute (42 U.S.C. §1320a-7b(b)), the U.S. Health Insurance Portability and Accountability Act of 1996 (42 U.S.C. §1320d et seq.), or HIPAA, as amended by the Health Information

Technology for Economic and Clinical Health Act (42 U.S.C. §17921 et seq.) and the regulations promulgated pursuant to such laws, and comparable state laws, and all other local, state, federal, national, supranational and foreign health care laws relating to the regulation of the Company (collectively, “Health Care Laws”); (3) the Company possesses all licenses, certificates, approvals, clearances, authorizations, permits and supplements or amendments thereto required by any such Health Care Laws and/or to carry on its businesses as currently conducted (“Authorizations”) and such Authorizations are in full force and effect and the Company is not in violation of any term of any such Authorizations; (4) the Company has not received written notice of any ongoing claim, action, suit, proceeding, hearing, enforcement, investigation, arbitration or other action from any U.S. or non-U.S. federal, state, local or other governmental or regulatory authority, governmental or regulatory agency or body, court, arbitrator or self-regulatory organization (each, a “Governmental Authority”) alleging that any product operation or activity is in violation of any Health Care Laws or Authorizations and, to the Company’s knowledge, no Governmental Authority is considering any such claim, litigation, arbitration, action, suit, investigation or proceeding; (5) the Company has not received written notice that any Governmental Authority has taken, is taking or intends to take action to limit, suspend, make a material adverse modification or revoke any Authorizations and to the Company’s knowledge no Governmental Authority is considering such action; and (6) the Company has filed, obtained, maintained or submitted all reports, documents, forms, notices, applications, records, submissions and supplements or amendments as required by any Health Care Laws or Authorizations and all such reports, documents, forms, notices, applications, records, submissions and supplements or amendments were complete, correct and not misleading on the date filed (or were corrected or supplemented by a subsequent submission);

(xli) To the knowledge of the Company, the research, studies and tests described in the Registration Statement, the Pricing Disclosure Package and the Prospectus and conducted by or on behalf of the Company have been and, if still pending, are being conducted in all material respects in accordance with all Health Care Laws and Authorizations; the descriptions of the results of such research, studies and tests contained in the Registration Statement, the Pricing Disclosure Package and the Prospectus are accurate and complete in all material respects and fairly present the data derived from such research, studies, and tests; except to the extent disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, the Company is not aware of any research, studies or tests, the results of which the Company believes reasonably call into question the research, study or test results described or referred to in the Registration Statement, the Pricing Disclosure Package and the Prospectus when viewed in the context in which such results are described; and the Company has not received any written notices or correspondence from any Governmental Authority requiring the termination, suspension or material adverse modification of any research, study or test conducted by or on behalf of the Company;

(xlii) Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, the Company (1) does not have any material lending or other relationship with any Underwriter or lending affiliate of any Underwriter and (2) does not intend to use any of the proceeds from the sale of the Shares to repay any outstanding debt owed to any affiliate of any Underwriter; and

(xliii) Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, the Company has not sold, issued or distributed any shares of Common Stock during the six-month period preceding the date hereof, including any sales pursuant to Rule 144A, Regulation D or Regulation S under the Securities Act, other than shares issued pursuant to employee benefit plans, qualified stock option plans or other employee compensation plans or pursuant to outstanding options, rights or warrants.

2. Subject to all the terms and conditions herein set forth, (a) the Company agrees to sell to each of the Underwriters, and each of the Underwriters agrees, severally and not jointly, to purchase from the Company, at a purchase price per share of $5.64 (the “Purchase Price”), the number of Firm Shares (to be adjusted by the Representatives solely to eliminate fractional shares) determined by multiplying the aggregate number of Firm Shares to be sold by the Company hereunder by a fraction, the numerator of which is the aggregate number of Firm Shares to be purchased by such Underwriter as set forth opposite the name of such Underwriter in Schedule I hereto and the denominator of which is the aggregate number of Firm Shares to be purchased by all of the Underwriters from the Company hereunder and (b) in the event and to the extent that the Underwriters shall exercise the election to purchase Option Shares as provided below, the Company agrees to sell to each of the Underwriters, and each of the Underwriters agrees, severally and not jointly, to purchase from the Company, at the Purchase Price, the number of Option Shares (to be adjusted by the Representatives solely to eliminate fractional shares) determined by multiplying the number of Option Shares as to which such election shall have been exercised by the fraction set forth in clause (a) above.

The Company hereby grants to the several Underwriters the right to purchase at their election up to 875,000 Option Shares, at the Purchase Price. The Underwriters may exercise their option to acquire Option Shares in whole or in part from time to time only by written notice from the Representatives to the Company, given within a period of 30 calendar days after the date of this Agreement and setting forth the aggregate number of Option Shares to be purchased and the date on which such Option Shares are to be delivered, as determined by the Representatives but in no event earlier than the Closing Date or, unless the Representatives and the Company otherwise agree in writing, earlier than two or later than five business days after the date of such notice.

3. It is understood that the several Underwriters propose to offer the Firm Shares for sale to the public upon the terms and conditions set forth in the Prospectus.

4. The Company will deliver the Firm Shares to the Representatives through the facilities of the Depository Trust Company (“DTC”) for the respective accounts of the Underwriters, against payment of the purchase price therefor in Federal (same day) funds by wire transfer to the account designated by the Company, at the office of Cooley LLP (“Cooley”), 1114 Avenue of the Americas, New York, New York 10036, at 10:00 A.M., New York time, on March 30, 2016, or at such other time not later than seven full business days thereafter as the Representatives and the Company determine, such time being herein referred to as the “Closing Date,” For purposes of Rule 15c6-1 under the Exchange Act, the Closing Date (if later than the otherwise applicable settlement date) shall be the settlement date for payment of funds and delivery of securities for all the Firm Shares. Delivery of the Firm Shares will be made by credit

to the accounts designated by the Representatives through DTC’s full fast transfer or DWAC programs.

Each time for the delivery of and payment for the Option Shares, being herein referred to as an “Option Closing Date,” which may be the Closing Date, shall be determined by the Representatives as provided above. The Company will deliver the Option Shares being purchased on each Option Closing Date to the Representatives through the facilities of DTC for the accounts of the Underwriters, against payment of the purchase price therefor in Federal (same day) funds by official bank check or checks or wire transfer drawn to the order of the Company at the above office of Cooley, at 10:00 A.M., New York time on the applicable Option Closing Date. Delivery of the Option Shares will be made by credit to the accounts designated by the Representatives through DTC’s full fast transfer or DWAC programs.

5. The Company covenants and agrees with each of the Underwriters as follows:

(a) The Company, subject to Section 5(b), will comply with the requirements of Rule 430B under the Securities Act and, during the Prospectus Delivery Period, will notify the Representatives promptly (and in any event within 24 hours), and confirm the notice in writing, (i) when any post-effective amendment to the Registration Statement shall become effective, or any supplement to the Prospectus or any amended prospectus shall have been filed, and furnish the Representatives with copies thereof, and file promptly all material required to be filed by the Company with the Commission pursuant to Rule 433(d) under the Securities Act, (ii) of the receipt of any comments from the Commission, (iii) of any request by the Commission for any amendment to the Registration Statement or any amendment or supplement to the Prospectus or for additional information, (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of any order preventing or suspending the use of any Preliminary Prospectus, or of the suspension of the qualification of the Shares for offering or sale in any jurisdiction, or of the Company’s knowledge of the initiation or threatening of any proceedings for any of such purposes; and (v) if the Company ceases to be an Emerging Growth Company at any time prior to the later of (1) completion of the distribution of the Shares within the meaning of the Securities Act and (2) completion of the 90-day restricted period referred to in Section 5(j) hereof. The Company will promptly effect the filings necessary pursuant to Rule 424(b) under the Securities Act and will take such steps as it deems necessary to ascertain promptly whether the form of prospectus transmitted for filing under Rule 424(b) was received for filing by the Commission and, in the event that it was not, it will promptly file such prospectus. The Company will make every reasonable effort to prevent the issuance of any stop order and, if any stop order is issued, to obtain the lifting thereof at the earliest possible moment.

(b) The Company will give the Representatives notice of its intention to file or prepare any amendment to the Registration Statement (including any filing under Rule 462(b) under the Securities Act), or any amendment, supplement or revision to the Prospectus, or any Issuer Free Writing Prospectus, will furnish the Representatives with copies of any such documents a reasonable amount of time prior to such proposed filing or use, as the case may be, and will not file or use any such document to which the Representatives or counsel for the Underwriters shall reasonably object.

(c) The Company will use its reasonable best efforts to qualify the Shares for offering and sale under the securities laws of such jurisdictions as the Representatives may reasonably request and to comply with such laws in all material respects 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 nothing in this Section 5(c) shall require the Company to qualify as a foreign corporation in any jurisdiction in which it is not already so qualified, file a general consent to service of process in any jurisdiction, or subject itself to taxation in any jurisdiction if it is not otherwise so subject.

(d) The Company will deliver to the Representatives, upon its request and without charge, three signed copies of the Initial Registration Statement as originally filed, any Rule 462(b) Registration Statement and of each amendment to each (including exhibits filed therewith or incorporated by reference therein) and signed copies of all consents and certificates of experts, and will also, upon your request, deliver to the Representatives, without charge, a conformed copy of the Registration Statement as originally filed and of each amendment thereto (without exhibits) for each of the Underwriters. The copies of the Registration Statement and each amendment thereto furnished to the Representatives will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

(e) The Company has delivered to each Underwriter, without charge, one electronic copy and as many written copies of each Preliminary Prospectus as such Underwriter reasonably requested, and the Company hereby consents to the use of such copies for purposes permitted by the Securities Act during the Prospectus Delivery Period. The Company will furnish to each Underwriter, without charge, prior to 5:00 P.M. (New York time) on the second business day next succeeding the date of this Agreement and from time to time thereafter during the Prospectus Delivery Period (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act), one electronic copy and such number of written copies of the Prospectus (as amended or supplemented) as such Underwriter may reasonably request. The Prospectus and any amendments or supplements thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

(f) The Company will comply with the Securities Act, the Rules and Regulations and the Exchange Act so as to permit the completion of the distribution of the Shares as contemplated in this Agreement and in the Prospectus. If, during the Prospectus Delivery Period, at any time when, in the reasonable opinion of counsel for the Underwriters, a prospectus is required to be delivered in connection with sales of the Shares under the Securities Act or the Exchange Act (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act), any event shall occur or condition shall exist as a result of which it is necessary, in the reasonable opinion of counsel for the Underwriters or for the Company, to amend the Registration Statement or amend or supplement the Prospectus or to file under the Exchange Act any document which would be deemed to be incorporated by reference in the Prospectus in order that the Prospectus will not include any untrue statements of a material fact or omit to state a material fact necessary in order to make the statements therein not misleading in the light of the circumstances existing at the time it (or in lieu thereof, the notice referred to in Rule 173(a) under the Securities Act) is delivered to a purchaser, or if it shall be necessary, in the reasonable

opinion of either such counsel, at any such time to amend the Registration Statement or amend or supplement the Prospectus in order to comply with the requirements of the Securities Act, the Rules and Regulations or the Exchange Act, the Company will promptly prepare and file with the Commission, subject to Section 5(b), such amendment or supplement as may be necessary to correct such statement or omission or to make the Registration Statement or the Prospectus or any document which would be deemed to be incorporated by reference in the Prospectus in order to comply with the Securities Act or the Exchange Act, and the Company will furnish to the Underwriters one electronic copy and such number of written copies of such amendment or supplement as the Underwriters may reasonably request. The Company will provide the Representatives with notice of the occurrence of any event during the period specified above that may give rise to the need to amend or supplement the Registration Statement or the Prospectus as provided in the preceding sentence promptly after the occurrence of such event.

(g) The Company will make generally available (within the meaning of Section 11(a) of the Securities Act) to its security holders and to the Representatives as soon as practicable, but not later than 45 days after the end of its fiscal quarter in which the first anniversary date of the effective date of the Registration Statement occurs, an earnings statement (in form complying with the provisions of Rule 158 under the Securities Act) covering a period of at least twelve consecutive months beginning after the effective date of the Registration Statement.

(h) The Company will use the net proceeds received by it from the sale of the Shares in the manner specified in the Pricing Disclosure Package and the Prospectus under the heading “Use of Proceeds.”

(i) The Company will use its reasonable best efforts to maintain the listing of the Common Stock (including the Shares) on NASDAQ.

(j) During a period of 90 days from the date of the Prospectus, the Company will not, without the prior written consent of PJC, (i) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend or otherwise transfer or dispose of, directly or indirectly, any Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (ii) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of Common Stock, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise, or publicly announce an intention to do any of the foregoing, other than (1) the Shares to be sold hereunder, (2) the issuance of equity-based awards granted pursuant to the Company’s benefit plans existing on the date hereof that are referred to in the Pricing Prospectus, as such plans may be amended (the “Company Incentive Plans”), (3) the issuance of shares of Common Stock upon the exercise of any such equity-based awards, (4) any shares of stock of the Company issued upon the conversion of securities outstanding on the date of this Agreement and described in the Pricing Disclosure Package, and (5) a number of shares of Common Stock, any securities convertible into, or exercisable, or exchangeable for, shares of Common Stock or any combination thereof in the aggregate up to five percent (5%) of the then-outstanding shares of Common Stock, sold or delivered in connection with any one or more acquisitions or strategic investments (including any joint venture, strategic alliance or partnership) as long as, in the case

of this clause (5), each recipient of any such shares or other securities agrees to restrictions on the resale of such securities that are consistent with the lock-up letters described in Section 8(n) hereof for the remainder of the 90-day restricted period referred to in this Section 5(j).

(k) The Company, during the Prospectus Delivery Period, will file all documents and reports required to be filed with the Commission and NASDAQ pursuant to the Exchange Act within the time periods required by the Exchange Act and the rules and regulations of the Commission or NASDAQ thereunder.

(l) During a period of three years from the effective date of the Registration Statement, the Company will furnish to the Representatives copies of all reports or other communications (financial or other) furnished to stockholders generally, and to deliver to the Representatives as soon as they are available, copies of any reports and financial statements furnished to or filed with the Commission or any national securities exchange on which any class of securities of the Company is listed; provided that the Company will be deemed to have furnished such reports and financial statements to the extent they are filed on EDGAR.

(m) If the Company elects to rely upon Rule 462(b) under the Securities Act, the Company will 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 at the time of filing either to pay to the Commission the filing fee for the Rule 462(b) Registration Statement or to give irrevocable instructions for the payment of such fee pursuant to Rule 111(b) under the Securities Act.

(n) If so requested by the Representatives, the Company shall cause to be prepared and delivered, at its expense, within one business day from the effective date of this Agreement, to the Representatives an “electronic Prospectus” to be used by the Underwriters in connection with the offering and sale of the Shares. As used herein, the term “electronic Prospectus” means a form of the most recent Preliminary Prospectus, any Issuer Free Writing Prospectus or the Prospectus, and any amendment or supplement thereto, that meets each of the following conditions: (i) it shall be encoded in an electronic format, reasonably satisfactory to the Representatives, that may be transmitted electronically by the Representatives and the other Underwriters to offerees and purchasers of the Shares, (ii) it shall disclose the same information as such paper Preliminary Prospectus, Issuer Free Writing Prospectus or the Prospectus, as the case may be; and (iii) it shall be in or convertible into a paper format or an electronic format, reasonably satisfactory to the Representatives, that will allow investors to store and have continuously ready access to such Preliminary Prospectus, Issuer Free Writing Prospectus or the Prospectus at any future time, without charge to investors (other than any fee charged for subscription to the Internet generally). The Company hereby confirms that, if so requested by the Representatives, it has included or will include in the Prospectus filed with the Commission an undertaking that, upon receipt of a request by an investor or his or her representative, the Company shall transmit or cause to be transmitted promptly, without charge, a paper copy of such paper Preliminary Prospectus, Issuer Free Writing Prospectus or the Prospectus to such investor or representative.

(o) The Company shall maintain, at its expense, a registrar and transfer agent for the Shares.

6. (a) The Company represents and agrees that, without the prior consent of the Representatives, 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; each Underwriter represents and agrees that, without the prior consent of the Company and the Representatives, it has not made and will not make any offer relating to the Shares that would constitute a free writing prospectus; any such free writing prospectus the use of which has been consented to by the Company and the Representatives is listed on Schedule II hereto;

(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; 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;

(c) The Company agrees that if at any time following issuance of an Issuer Free Writing Prospectus any event occurred or occurs as a result of which such Issuer Free Writing Prospectus would conflict with the information in the Registration Statement, the Pricing Disclosure Package or the Prospectus or, when considered together with the information in the Pricing Disclosure Package and other Issuer Free Writing Prospectuses, 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 light of the circumstances then prevailing, not misleading, the Company will give prompt notice thereof to the Representatives and, if requested by the Representatives, will prepare and furnish without charge to each Underwriter an Issuer Free Writing Prospectus or other document which will correct such conflict, statement or omission; provided, however, that this covenant shall not apply to any statements or omissions in an Issuer Free Writing Prospectus made in reliance upon and in strict conformity with information furnished in writing to the Company by an Underwriter through the Representatives expressly for use therein.

7. The Company covenants and agrees with the several Underwriters that, whether or not the transactions contemplated by this Agreement are consummated, the Company will pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including (i) the fees, disbursements and expenses of the Company’s counsel, accountants and other advisors; (ii) filing fees and all other expenses in connection with the preparation, printing and filing of the Registration Statement, each 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) the cost of printing or producing this Agreement, closing documents (including any compilations thereof) and such other documents as may be required in connection with the offering, purchase, sale and delivery of the Shares; (iv) all expenses in connection with the qualification of the Shares for offering and sale under state securities laws as provided in Section 5(c) and the securities laws of Canada, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky survey and, if requested by the Representatives, a “Canadian wrapper” (not to exceed $10,000, excluding disbursements), if applicable; (v) all fees and expenses in connection with listing the Shares on NASDAQ; (vi) the filing fees incident to, and the reasonable fees and disbursements of counsel for the Underwriters (up to a maximum of $25,000) in connection with, securing any required review by FINRA of the terms of the sale of the Shares; (vii) all fees and expenses in

connection with the preparation, issuance and delivery of the Shares to the Underwriters, including any stock or other transfer taxes and any stamp or other duties payable upon the sale, issuance or delivery of the Shares to the Underwriters; (viii) the cost and charges of DTC and any transfer agent or registrar; (ix) the transportation and other expenses incurred by the Company in connection with investor presentations on any “road show” undertaken in connection with the marketing of the Shares, including, without limitation, all costs and expenses associated with any electronic road show (provided, however, that the Underwriters and the Company shall each pay 50% of the cost of any aircraft chartered in connection with the road show by the Company and the Underwriters); and (x) all other costs and expenses incident to the performance of its obligations hereunder which are not otherwise specifically provided for in this Section. It is understood that, subject to this Section 7 and Section 12, the Underwriters will pay all of their costs and expenses associated with the transactions contemplated hereunder, including all fees and disbursements of their counsel. The Company further agrees that, in addition to the expenses payable as described above, on the Closing Date, it shall pay to the Representatives, by deduction from the net proceeds of the offering contemplated herein, a non-accountable expense allowance equal to $150,000.

8. The several obligations of the Underwriters hereunder to purchase the Shares on the Closing Date or each Option Closing Date, as the case may be, are subject to the performance by the Company of its obligations hereunder and to the following additional conditions:

(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 and in accordance with Section 5(a); 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 under the Securities Act; 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 or the Prospectus or any part thereof or any Issuer Free Writing Prospectus shall have been issued and no proceeding for that purpose shall have been initiated or, to the knowledge of the Company, threatened by the Commission or any state securities commission; and all requests for additional information on the part of the Commission shall have been complied with to the reasonable satisfaction of the staff of the Commission.

(b) The representations and warranties of the Company contained herein are true and correct on and as of the Closing Date or the Option Closing Date, as the case may be, as if made on and as of the Closing Date or the Option Closing Date, as the case may be, and the Company shall have complied with all agreements and all conditions on its part to be performed or satisfied hereunder at or prior to the Closing Date or the Option Closing Date, as the case may be.

(c) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date or the Option Closing Date, as the case may be, there shall not have occurred any downgrading, nor shall any notice have been given of (i) any downgrading, (ii) any intended or potential downgrading or (iii) any review or possible change that does not indicate an improvement, in the rating accorded any securities of or guaranteed by the Company or any Subsidiary by any “nationally recognized statistical rating organization,” as such term is defined in Section 3(a)(62) of the Exchange Act.

(d) (i) The Company shall have not sustained since the date of the latest audited financial statements included or incorporated by reference in the Pricing Disclosure Package 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 Disclosure Package, and (ii) since the respective dates as of which information is given in the Registration Statement, the Pricing Disclosure Package and the Prospectus and except as described in the Registration Statement and the Prospectus, (1) there shall not have been any change in the capital stock (other than the issuance of shares of Common Stock upon the exercise or conversion of securities, or the grant of options, restricted stock or other equity-based awards under the Company’s equity incentive plans, in each case as described in the Pricing Disclosure Package) or long-term debt of the Company and (2) there shall not have been any Material Adverse Effect, the effect of which, in any such case described in clause (i) or (ii), is in the judgment of the Representatives 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 Closing Date or Option Closing Date, as the case may be, on the terms and in the manner contemplated in the Pricing Disclosure Package and the Prospectus.

(e) The Representatives shall have received on and as of the Closing Date or the Option Closing Date, as the case may be, a certificate of two executive officers of the Company, at least one of whom has specific knowledge about the Company’s financial matters, satisfactory to the Representatives, to the effect (i) set forth in Sections 8(b) (with respect to the respective representations, warranties, agreements and conditions of the Company) and 8(c), (ii) that none of the situations set forth in clause (i) or (ii) of Section 8(d) shall have occurred and (iii) that no stop order suspending the effectiveness of the Registration Statement has been issued and to the knowledge of the Company, no proceedings for that purpose have been instituted or are pending or contemplated by the Commission.

(f) On the Closing Date or Option Closing Date, as the case may be, Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, corporate counsel for the Company, shall have furnished to the Representatives its written opinion and disclosure letter, dated the Closing Date or the Option Closing Date, as the case may be, in form and substance reasonably satisfactory to counsel for the Underwriters.

(g) On the Closing Date or Option Closing Date, as the case may be, McCarter & English, LLP, intellectual property counsel for the Company, shall have furnished to the Representatives their favorable written opinion, dated the Closing Date or the Option Closing Date, as the case may be, in form and substance satisfactory to counsel for the Underwriters.

(h) On the Closing Date or Option Closing Date, as the case may be, the chief scientific officer of the Company, shall have furnished to the Representatives a certificate, dated the Closing Date or the Option Closing Date, as the case may be, in form and substance reasonably satisfactory to counsel for the Underwriters.

(i) On the date hereof and, if applicable, the effective date of the most recently filed post-effective amendment to the Registration Statement, Ernst & Young LLP shall have furnished to the Representatives a letter, dated the date of delivery thereof, in form and

substance satisfactory to the Representatives, containing statements and information of the type customarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Pricing Disclosure Package and the Prospectus.

(j) On the Closing Date or Option Closing Date, as the case may be, the Representatives shall have received from Ernst & Young LLP a letter, dated the Closing Date or such Option Closing Date, as the case may be, to the effect that they reaffirm the statements made in the letter or letters furnished pursuant to Section 8(i), except that the specified date referred to shall be a date not more than three business days prior to the Closing Date or such Option Closing Date, as the case may be.

(k) On the Closing Date or Option Closing Date, as the case may be, Cooley LLP, counsel for the Underwriters, shall have furnished to the Representatives their favorable opinion and negative assurance letter dated the Closing Date or the Option Closing Date, as the case may be, with respect to the due authorization and valid issuance of the Shares, the Registration Statement, the Prospectus and other related matters as the Representatives 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.

(l) The Shares to be delivered on the Closing Date or Option Closing Date, as the case may be, shall have been approved for listing on NASDAQ, subject to official notice of issuance.

(m) FINRA shall have confirmed that it has not raised any objection with respect to the fairness and reasonableness of the underwriting terms and conditions.

(n) PJC shall have received “lock-up” agreements, each substantially in the form of Exhibit A hereto, from all the officers and directors of the Company, and such agreements shall be in full force and effect on the Closing Date or Option Closing Date, as the case may be.

(o) On or prior to the Closing Date or Option Closing Date, as the case may be, the Company shall have furnished to the Representatives such further information, certificates and documents as the Representatives shall reasonably request.

(p) 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 NASDAQ; (ii) a suspension or material limitation in trading in the Company’s securities on NASDAQ; (iii) a general moratorium on commercial banking activities declared by any of Federal, Delaware or New York State authorities or a material disruption in commercial banking or securities settlement or clearance services in the U.S.; (iv) the outbreak or escalation of hostilities involving the U.S. or the declaration by the U.S. 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 U.S. or elsewhere, if the effect of any such event specified in clause (iv) or (v) in the judgment of the Representatives makes it impracticable or inadvisable to proceed with the public offering or the delivery of the Shares being delivered at such Closing Date or Option

Closing Date, as the case may be, on the terms and in the manner contemplated in the Prospectus.

If any condition specified in this Section 8 shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated, subject to the provisions of Section 12, by the Representatives with notice to the Company at any time at or prior to the Closing Date or Option Closing Date, as the case may be, and such termination shall be without liability of any party to any other party, except as provided in Section 12.

9. (a) The Company agrees to indemnify and hold harmless each Underwriter and each person, if any, who controls any Underwriter within the meaning of Section 15 of the Securities Act or Section 20(a) of the Exchange Act against any and all losses, liabilities, claims, damages and expenses whatsoever as incurred (including without limitation, reasonable attorneys’ fees and any and all reasonable expenses whatsoever incurred in investigating, preparing or defending against any litigation, commenced or threatened, or any claim whatsoever, and any and all amounts paid in settlement of any claim or litigation), joint or several, to which they or any of them may become subject under the Securities Act, the Exchange Act or otherwise, insofar as such losses, liabilities, claims, damages or expenses (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement (including the Rule 430B Information and any other information deemed to be a part of the Registration Statement at the time of its effectiveness and at any subsequent time pursuant to the Rules and Regulations, if applicable), or any post-effective amendment thereof, any Preliminary Prospectus, the Pricing Disclosure Package or the Prospectus, or in any supplement thereto or amendment thereof, any Issuer Free Writing Prospectus, any “issuer information” filed or required to be filed pursuant to Rule 433(d) under the Securities Act, or any materials or information provided to investors by, or with the approval of, the Company in connection with the marketing of the offering of the Shares, including any “road show” (as defined in Rule 433 under the Securities Act) not constituting an Issuer Free Writing Prospectus, 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; provided, however, that the Company will not be liable in any such case to the extent that any such loss, liability, claim, damage or expense arises out of or is based upon any such untrue statement or alleged untrue statement or omission or alleged omission made in the Initial Registration Statement, as originally filed or any amendment thereof, the Registration Statement, or any post-effective amendment thereof, any Preliminary Prospectus, the Pricing Prospectus or the Prospectus, or in any supplement thereto or amendment thereof, or any Issuer Free Writing Prospectus in reliance upon and in strict conformity with the Underwriter Information.

(b) Each Underwriter severally, and not jointly, agrees to indemnify and hold harmless the Company, each of the directors of the Company, each of the officers of the Company who shall have signed the Registration Statement, and each other person, if any, who controls the Company within the meaning of Section 15 of the Securities Act or Section 20(a) of the Exchange Act, against any losses, liabilities, claims, damages and expenses whatsoever as incurred (including without limitation, reasonable attorneys’ fees and any and all reasonable expenses whatsoever incurred in investigating, preparing or defending against any litigation, commenced or threatened, or any claim whatsoever, and any and all amounts paid in settlement

of any claim or litigation), joint or several, to which they or any of them may become subject under the Securities Act, the Exchange Act or otherwise, insofar as such losses, liabilities, claims, damages or expenses (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, or any post-effective amendment thereof, or any Preliminary Prospectus, the Pricing Disclosure Package or the Prospectus, or in any supplement thereto or amendment thereof, 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 arise out of or are based upon the omission or alleged omission to state therein a material fact necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that any such loss, liability, claim, damage or expense arises out of or is based upon any such untrue statement or alleged untrue statement or omission or alleged omission made therein in reliance upon and in strict conformity with the Underwriter Information. It is hereby agreed that the only information that shall constitute Underwriter Information consists of the last paragraph of the front cover page concerning delivery of shares by the Underwriters and the information in the following paragraphs under the caption “Underwriting” in the Prospectus: (i) the first paragraph under the heading “Discounts and Commissions” and (ii) the second and third paragraphs under the heading “Price Stabilization, Short Positions and Penalty Bids.”

(c) Promptly after receipt by an indemnified party under Section 9(a) or 9(b) 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 Section, notify each party against whom indemnification is to be sought in writing of the commencement thereof (but the failure so to notify an indemnifying party shall not relieve it from any liability which it may have under this Section 9). In case any such action is brought against any indemnified party, and it notifies an indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein, and jointly with any other indemnifying party similarly notified, to the extent it may elect by written notice delivered to the indemnified party promptly after receiving the aforesaid notice from such indemnified party, to assume the defense thereof with counsel reasonably satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnified party). Notwithstanding the foregoing, the indemnified party or parties shall have the right to employ its or their own counsel in any such case, but the fees and expenses of such counsel shall be at the expense of such indemnified party or parties unless (i) the employment of such counsel shall have been authorized in writing by one of the indemnifying parties in connection with the defense of such action, (ii) the indemnifying parties shall not have employed counsel to have charge of the defense of such action within a reasonable time after notice of commencement of the action, or (iii) such indemnified party or parties shall have reasonably concluded based on advice from outside counsel that there may be defenses available to it or them which are different from or additional to those available to one or all of the indemnifying parties (in which case the indemnifying parties shall not have the right to direct the defense of such action on behalf of the indemnified party or parties), in any of which events the reasonable fees and expenses of such counsel shall be borne by the indemnifying parties. In no event shall the indemnifying parties be liable for fees and expenses of more than one counsel (in addition to any local counsel) separate from their own counsel for all indemnified parties in connection with any one action or separate but similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances, which counsel, in the event of indemnified parties under Section 9(a), shall be

selected by the Representatives. An indemnifying party shall not be liable for any settlement of any action or claim effected without its written consent (which consent will not be unreasonably withheld or delayed). 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.

(d) If the indemnification provided for in this Section 9 is unavailable to or insufficient to hold harmless an indemnified party under Section 9(a) or 9(b) in respect of any losses, liabilities, claims, damages or expenses (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, liabilities, claims, damages or expenses (or actions in respect thereof) in such proportion as is appropriate to reflect the relative benefits received by the Company 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, 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 on the one hand and the Underwriters on the other in connection with the statements or omissions which resulted in such losses, liabilities, claims, damages or expenses (or actions in respect thereof), as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Underwriters on the other from the offering of the Shares shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Company 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 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 and the Underwriters agree that it would not be just and equitable if contributions pursuant to this Section 9(d) were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this Section 9(d). The amount paid or payable by an indemnified party as a result of the losses, liabilities, claims, damages or expenses (or actions in respect thereof) referred to above in this Section 9(d) 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 Section 9(d), no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which

such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission.

No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations in this Section 9(d) to contribute are several in proportion to their respective underwriting obligations and not joint.

(e) The obligations of the parties to this Agreements contained in this Section 9 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

10. If any Underwriter or Underwriters default in its or their obligations to purchase Shares hereunder on the Closing Date or any Option Closing Date and the aggregate number of Shares that such defaulting Underwriter or Underwriters agreed but failed to purchase does not exceed 10% of the total number of Shares that the Underwriters are obligated to purchase on such Closing Date or Option Closing Date, as the case may be, the Representatives may make arrangements satisfactory to the Company for the purchase of such Shares by other persons, including any of the Underwriters, but if no such arrangements are made by such Closing Date or Option Closing Date, as the case may be, the non-defaulting Underwriters shall be obligated severally, in proportion to their respective commitments hereunder, to purchase the Shares that such defaulting Underwriters agreed but failed to purchase on such Closing Date or Option Closing Date, as the case may be. If any Underwriter or Underwriters so default and the aggregate number of Shares with respect to which such default or defaults occur exceeds 10% of the total number of Shares that the Underwriters are obligated to purchase on such Closing Date or Option Closing Date, as the case may be, and arrangements satisfactory to the Representatives and the Company for the purchase of such Shares by other persons are not made within 36 hours after such default, this Agreement will terminate, subject to the provisions of Section 12, without liability on the part of any non-defaulting Underwriter or the Company, except as provided in Section 12. Nothing herein will relieve a defaulting Underwriter from liability for its default.

In the event of any such default which does not result in a termination of this Agreement, either the Representatives or the Company shall have the right to postpone the Closing Date or the relevant Option Closing Date, as the case may be, for a period not exceeding seven days in order to effect any required changes in the Registration Statement or Prospectus or in any other documents or arrangements. As used in this Agreement, the term “Underwriter” includes any person substituted for an Underwriter under this Section 10.

11. Notwithstanding anything herein contained, this Agreement (or the obligations of the several Underwriters with respect to any Option Shares which have yet to be purchased) may be terminated, subject to the provisions of Section 12, in the absolute discretion of the Representatives, by notice given to the Company, if after the execution and delivery of this Agreement and prior to the Closing Date or the Option Closing Date, as the case may be, (a) trading generally on the NYSE MKT or the New York Stock Exchange or on NASDAQ or the NASDAQ Global Select Market shall have been suspended or materially limited, or minimum or maximum prices for trading have been fixed, or maximum ranges for prices have been required, by any of said exchanges or by such system or by order of the Commission, FINRA or any other

governmental or regulatory authority, (b) trading of any securities of or guaranteed by the Company shall have been suspended on any exchange or in any over-the-counter market, (c) a general moratorium on commercial banking activities in New York or Delaware shall have been declared by Federal, New York or Delaware State authorities or a new restriction materially adversely affecting the distribution of the Firm Shares or the Option Shares, as the case may be, shall have become effective, or (d) there has occurred any material adverse change in the financial markets in the U.S. or the international financial markets, any outbreak of hostilities or escalation thereof or other calamity or crisis or any change or development involving a prospective change in national or international political, financial or economic conditions, in each case the effect of which is such as to make it, in the judgment of the Representatives, impracticable to market the Shares to be delivered on the Closing Date or Option Closing Date, as the case may be, or to enforce contracts for the sale of the Shares.

If this Agreement is terminated pursuant to this Section 11, such termination will be without liability of any party to any other party except as provided in Section 12 hereof.

12. The respective indemnities, agreements, representations, warranties and other statements of the Company or its officers and of the several Underwriters set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation, or statement as to the results thereof, made by or on behalf of any Underwriter, the Company or any of their respective representatives, officers or directors or any controlling person, and will survive delivery of and payment for the Shares. If this Agreement is terminated pursuant to Section 8, 10 or 11 or if for any reason the purchase of any of the Shares by the Underwriters is not consummated, the Company shall remain responsible for the expenses to be paid or reimbursed by it pursuant to Section 7, the respective obligations of the Company and the Underwriters pursuant to Section 9 and the provisions of Sections 12, 13 and 16 shall remain in effect and, if any Shares have been purchased hereunder the representations and warranties in Section 1 and all obligations under Section 5 and Section 6 shall also remain in effect. If this Agreement shall be terminated by the Underwriters, or any of them, under Section 8 or otherwise because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement (other than solely by reason of the failure of any Underwriter to perform its obligations hereunder), or if for any reason the Company shall be unable to perform its obligations under this Agreement (other than solely by reason of the failure of any Underwriter to perform its obligations hereunder) or any condition of the Underwriters’ obligations cannot be fulfilled, the Company agrees to reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and expenses of its counsel) reasonably incurred by the Underwriter in connection with this Agreement or the offering contemplated hereunder.

13. This Agreement shall inure to the benefit of and be binding upon the Company and the Underwriters, the officers and directors of the Company referred to herein, any controlling persons referred to herein and their respective successors and assigns. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any other person, firm or corporation any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained. No purchaser of Shares from any Underwriter shall be deemed to be a successor or assign by reason merely of such purchase.

14. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given upon receipt thereof by the recipient if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters shall be given to the Representatives: (a) c/o Piper Jaffray & Co., 800 Nicollet Mall, Minneapolis, Minnesota 55402, Attention: Equity Capital Markets (fax: (612) 303-1070), and c/o Piper Jaffray & Co., 800 Nicollet Mall, Minneapolis, Minnesota, 55402, Attention: General Counsel (fax: (612) 303-1068); and (b) c/o BMO Capital Markets Corp., 3 Times Square, New York, New York 10036, Attention: Legal Department (fax: (212) 702-1205). Notices to the Company shall be given to it at Vitae Pharmaceuticals, Inc., 502 West Office Center Drive, Fort Washington, Pennsylvania 19303 (fax no.: (215) 461-2006); Attention: Richard Morris.

15. This Agreement may be signed in counterparts, each of which shall be an original and all of which together shall constitute one and the same instrument.

16. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO SUCH STATE’S PRINCIPLES OF CONFLICTS OF LAWS.

17. The parties hereby submit to the jurisdiction of and venue in the federal courts located in the City of New York, New York in connection with any dispute related to this Agreement, any transaction contemplated hereby, or any other matter contemplated hereby.

18. The Company acknowledges and agrees that (i) the purchase and sale of the Shares pursuant to this Agreement, including the determination of the public offering price of the Shares and any related discounts and commissions, is an arm’s-length commercial transaction between the Company 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 acting solely as a principal and not the agent or fiduciary of the Company or its respective stockholders, creditors, employees or any other party, (iii) no Underwriter has assumed an advisory or fiduciary responsibility in favor of the Company 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 on other matters) or any other obligation to the Company except the obligations expressly set forth in this Agreement, and (iv) the Company has consulted its own legal and financial advisors to the extent it deemed appropriate. The Company agrees that it will not claim that the Underwriters, or any of them, has rendered advisory services of any nature or respect, or owes a fiduciary or similar duty to the Company, in connection with such transaction or the process leading thereto.

19. The Company acknowledges that the Underwriters’ research analysts and research departments are required to be independent from their respective investment banking divisions and are subject to certain regulations and internal policies, and that such Underwriters’ research analysts may hold views and make statements or investment recommendations and/or publish research reports with respect to the Company and/or the offering that differ from the views of their respective investment banking divisions. The Company hereby waives and releases, to the fullest extent permitted by law, any claims that the Company may have against the Underwriters with respect to any conflict of interest that may arise from the fact that the views expressed by their independent research analysts and research departments may be

different from or inconsistent with the views or advice communicated to the Company by such Underwriters’ investment banking divisions. The Company acknowledges that each of the Underwriters is a full service securities firm and as such from time to time, subject to applicable securities laws, may effect transactions for its own account or the account of its customers and hold long or short positions in debt or equity securities of the companies that may be the subject of the transactions contemplated by this Agreement.

20. Notwithstanding anything herein to the contrary, the Company is 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 relating to that treatment and structure, without the Underwriters imposing any limitation of any kind. However, any information relating to the tax treatment and tax structure shall remain confidential (and the foregoing sentence shall not apply) to the extent necessary to enable any person to comply with securities laws. For this purpose, “tax structure” is limited to any facts that may be relevant to that treatment.

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

22. The Company 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.

If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument will become a binding agreement among the Company and the Underwriters.

		Very truly yours,

		VITAE PHARMACEUTICALS, INC.


		By:	/s/ Jeffrey S. Hatfield
		Name: Jeffrey S. Hatfield
		Title: Chief Executive Officer


Accepted as of the date hereof:

PIPER JAFFRAY & CO.

By:	Piper Jaffray & Co.


By:	/s/ David W. Stadinsksi
Title: Managing Director


BMO CAPITAL MARKETS CORP.

By:	BMO Capital Markets Corp.


By:	/s/ Lori Begley
Title: Managing Director


For themselves and as Representatives of the other Underwriters named in Schedule I hereto

SCHEDULE I

		Number of Firm Shares
Underwriter		to be Purchased

Piper Jaffray & Co.		3,208,333
BMO Capital Markets Corp.		1,925,000
Wedbush Securities Inc.		700,000
Total:		5,833,333

EXHIBIT A

FORM OF LOCK-UP AGREEMENT

Lock-Up Agreement

Vitae Pharmaceuticals, Inc.

502 West Office Center Drive

Fort Washington, PA 19034

PIPER JAFFRAY & CO.

As Representative of the Underwriters

c/o Piper Jaffray & Co.

345 Park Avenue, 12th Fl.

New York, NY 10154

Ladies and Gentlemen:

The undersigned refers to the proposed Underwriting Agreement (the “Underwriting Agreement”) among Vitae Pharmaceuticals, Inc., a Delaware corporation (the “Company”), and the several underwriters named therein (the “Underwriters”) for whom Piper Jaffray & Co. (the “Representative”) is acting as representative. As an inducement to the Representative to execute the Underwriting Agreement on behalf of the Underwriters in connection with the proposed public offering (the “Proposed Offering”) of shares of the Company’s common stock, par value $0.0001 per share (“Common Stock”), pursuant to a Registration Statement on Form S-3, as amended or supplemented, the undersigned hereby agrees that from the date hereof and until 90 days after the public offering date set forth on the final prospectus supplement used to sell the Common Stock (the “Public Offering Date”) pursuant to the Underwriting Agreement (such 90-day period being referred to herein as the “Lock-Up Period”), the undersigned will not (and will cause any spouse, domestic partner or immediate family member of the spouse, domestic partner or the undersigned living in the undersigned’s household, any partnership, corporation, limited liability company or other entity within the undersigned’s control, and any trustee of any trust that holds Common Stock or other securities of the Company for the benefit of the undersigned or such spouse, domestic partner or immediate family member not to) offer, sell, contract to sell (including any short sale), pledge, hypothecate, establish an open “put equivalent position” within the meaning of Rule 16a-1(h) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), grant any option, right or warrant for the sale of, purchase any option or contract to sell, sell any option or contract to purchase, or otherwise encumber, dispose of or transfer, or grant any rights with respect to, directly or indirectly, any shares of Common Stock or securities convertible into or exchangeable or exercisable for any shares of Common Stock, enter into a transaction which would have the same effect, or enter into any swap, hedge or other arrangement that transfers, in whole or in part, any of the economic consequences of ownership

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of the Common Stock held immediately prior to the Public Offering Date, whether any such aforementioned transaction is to be settled by delivery of the Common Stock or such other securities, in cash or otherwise, or publicly disclose the intention to make any such offer, sale, pledge or disposition, or to enter into any such transaction, swap, hedge or other arrangement with respect to such securities, without, in each case, the prior written consent of the Representative, which consent may be withheld in the Representative’s sole discretion. For purposes of this letter agreement (“Agreement”), “immediate family member” shall mean any relation by blood, marriage or adoption, not more remote than first cousin.

The foregoing restrictions shall not apply to the following:

a) (i) transactions relating to securities acquired in open market transactions after the Public Offering Date and (ii) if the undersigned is not an officer or director of the Company, transfers or other dispositions of shares of Common Stock purchased by the undersigned in the offering contemplated by the Underwriting Agreement; provided that, in the case of any transactions pursuant to the preceding clauses (a)(i) and (ii), no filing by any party under the Exchange Act shall be required or shall be voluntarily made before the expiration of the Lock-Up Period in connection with subsequent sales of Common Stock or other securities acquired in such open market transactions;

b) (i) bona fide gifts by the undersigned, (ii) transfers of Common Stock or any security convertible into or exercisable for Common Stock to an immediate family member, an immediate family member of a spouse, a domestic partner or a trust for the benefit of the undersigned, a spouse, a domestic partner or an immediate family member or to any partnership, corporation, or other entity all of the beneficial ownership interests of which are held exclusively by the undersigned, a spouse, a domestic partner and/or one or more family members of the undersigned or the undersigned’s spouse or domestic partner in a transaction not involving a disposition for value, (iii) transfers of Common Stock or any security convertible into or exercisable for Common Stock upon death by will or intestate succession, (iv) securities transferred to one or more affiliates of the undersigned and distributions of securities to current or former partners, members or equity holders of the undersigned in a transaction not in exchange for new consideration, and (v) transfers of Common Stock or any security convertible into or exercisable for Common Stock solely by operation of law, such as pursuant to a qualified domestic order or in connection with a divorce settlement, provided that, in the case of any transactions pursuant to the preceding clauses (b)(i)-(v), (1) each resulting transferee of the Company’s securities executes and delivers to the Representative a lock-up agreement in the same form as this Agreement, (2) to the extent any interest in the Company’s securities is retained by the undersigned (or such spouse or family member), such securities shall remain subject to the restrictions contained in this Agreement, and (3) no filing by any party under the Exchange Act shall be required or shall be voluntarily made before the expiration of the Lock-Up Period showing a decrease in the number of shares of Common Stock held by the undersigned and its affiliates in such filing;

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c) the exercise of any option, warrant or other right to acquire shares of Common Stock (including by cashless or net exercise, to the extent permitted by the instrument governing such option or warrant, so long as such cashless or net exercise is effected solely by the surrender of outstanding options or warrants held by the undersigned to the Company and the Company’s cancellation of all or a portion thereof to pay the applicable exercise price, but, for the avoidance of doubt, excluding all methods of exercise that involve a sale of any shares of Common Stock relating to options or warrants to cover the applicable exercise price), the settlement of any stock-settled stock appreciation rights, restricted stock or restricted stock units, or the conversion of any convertible security into securities of the Company, provided, however, that in any such case the securities issued upon exercise shall remain subject to the provisions of this Agreement;

d) the entry into any trading plan established pursuant to Rule 10b5-1 under the Exchange Act, provided that such plan does not provide for any sales or other dispositions of Common Stock during the Lock-Up Period and to the extent a public announcement or filing under the Exchange Act, if any, is required of or voluntarily made by or on behalf of the undersigned or the Company regarding the establishment of such plan, such announcement or filing shall include a statement to the effect that no transfer of Common Stock may be made under such plan during the Lock-Up Period; or

e) the surrender or forfeiture of shares of Common Stock to the Company in a transaction exempt from Section 16(b) of the Exchange Act to satisfy tax withholding obligations upon exercise or vesting of stock options or equity awards.

In addition, the undersigned agrees that, during the period commencing on the date hereof and ending 90 days after the Public Offering Date, without the prior written consent of the Representative (which consent may be withheld in its sole discretion): (a) the undersigned will not request, make any demand for or exercise any right with respect to, the registration of any Common Stock or any security convertible into or exercisable or exchangeable for Common Stock and (b) the undersigned waives any and all notice requirements and rights with respect to the registration of any such security pursuant to any agreement, understanding or otherwise to which the undersigned is a party.

In furtherance of the foregoing, the Company and its transfer agent and registrar are hereby authorized to (a) decline to make any transfer of shares of Common Stock if such transfer would constitute a violation or breach of this Agreement and (b) place legends on any shares of Common Stock held immediately prior to the Public Offering Date and stop transfer instructions on any such shares of Common Stock owned or beneficially owned by the undersigned.

This Agreement is irrevocable and shall be binding on the undersigned and the successors, heirs, personal representatives and assigns of the undersigned. This Agreement shall be governed by and construed in accordance with the laws of the State of New York, without regard to choice of law rules. This Agreement shall lapse and become null and void if the Public Offering Date shall not have occurred on or before the earliest of (a) such time as the Representative on the one hand, or the Company, on the other hand, advises the other in writing, prior to the execution of the Underwriting Agreement, that it has determined not to proceed with

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Delaware		001-36617		04-3567753
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(IRS Employer Identification No.)

502 West Office Center Drive Fort Washington, PA 19034		19034
(Address of Principal Executive Offices)		(Zip Code)

Exhibit No.		Description
1.1		Underwriting Agreement, dated March 24, 2016, by and among Vitae Pharmaceuticals, Inc. and Piper Jaffray & Co. and BMO Capital Markets Corp., as representatives of the several Underwriters
5.1		Opinion of Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP
23.1		Consent of Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP (contained in Exhibit 5.1)
99.1		Press Release of Vitae Pharmaceuticals, Inc., dated March 24, 2016

·	Firm Shares:	5,833,333
·	Price per Share:	$6.00
·	The Underwriters have an option to purchase up to 875,000 Option Shares.

Vitae Pharmaceuticals, Inc.		Tel: (215) 461-2000
502 West Office Center Drive		Fax: (215) 461-2006
Fort Washington, PA 19034		www.vitaepharma.com

	VITAE PHARMACEUTICALS, INC.


Date: March 24, 2016	By:	/s/ Jeffrey S. Hatfield
		Jeffrey S. Hatfield
		Chief Executive Officer

Very truly yours,

/s/ Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP
GUNDERSON DETTMER STOUGH VILLENEUVE FRANKLIN & HACHIGIAN, LLP