EX-10.1





 Exhibit 10.1 

SECURITIES PURCHASE AGREEMENT 

This Securities Purchase Agreement (this “Agreement”) is dated as of March 8, 2019, between Altimmune, Inc., a Delaware
corporation (the “Company”), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a “Purchaser” and collectively the “Purchasers”). 

WHEREAS, subject to the terms and conditions set forth in this Agreement and pursuant to an effective registration statement under the
Securities Act of 1933, as amended (the “Securities Act”), the Company desires to issue and sell to each Purchaser, and each Purchaser, severally and not jointly, desires to purchase from the Company, securities of the Company as
more fully described in this Agreement. 
 NOW, THEREFORE, IN CONSIDERATION of the mutual covenants contained in this Agreement, and for
other good and valuable consideration the receipt and adequacy of which are hereby acknowledged, the Company and each Purchaser agree as follows: 

ARTICLE I. 
 DEFINITIONS

 1.1 Definitions. In addition to the terms defined elsewhere in this Agreement, for all purposes of this Agreement, the following
terms have the meanings set forth in this Section 1.1: 
 “Acquiring Person” shall have the meaning
ascribed to such term in Section 4.4. 
 “Action” means an action, suit, inquiry, notice of violation,
proceeding or investigation pending or, to the knowledge of the Company, threatened against or affecting the Company, any Subsidiary or any of their respective properties before or by any court, arbitrator, governmental or administrative agency or
regulatory authority (federal, state, county, local or foreign). 
 “Affiliate” means any Person that,
directly or indirectly through one or more intermediaries, controls or is controlled by or is under common control with a Person as such terms are used in and construed under Rule 405 under the Securities Act. 

“Board of Directors” means the board of directors of the Company. 

“Business Day” means any day except any Saturday, any Sunday, any day which is a federal legal holiday in the
United States or any day on which banking institutions in the State of New York are authorized or required by law or other governmental action to close. 

“Closing” means the closing of the purchase and sale of the Shares, the
Pre-Funded Warrants, if any, and the Warrants comprising the Units pursuant to Section 2.1. 












 “Closing Date” means the Trading Day on which all of the
Transaction Documents have been executed and delivered by the applicable parties thereto, and all conditions precedent to (i) the Purchasers’ obligations to pay the Subscription Amount and (ii) the Company’s obligations to
deliver the Securities, in each case, have been satisfied or waived, but in no event later than the second (2nd) Trading Day following the date hereof. 

“Commission” means the United States Securities and Exchange Commission. 

“Common Stock” means the common stock of the Company, par value $0.0001 per share, and any other class of
securities into which such securities may hereafter be reclassified or changed. 
 “Common Stock
Equivalents” means any securities of the Company or the Subsidiaries which would entitle the holder thereof to acquire at any time Common Stock, including, without limitation, any debt, preferred stock, right, option, warrant or other
instrument that is at any time convertible into or exercisable or exchangeable for, or otherwise entitles the holder thereof to receive, Common Stock. 

“Common Unit” means a fixed combination of one Share and one Warrant to purchase one Warrant Share. 

“Common Unit Subscription Amount” means, as to each Purchaser, the aggregate amount to be paid for Common
Units purchased hereunder as specified below such Purchaser’s name on the signature page of this Agreement and next to the heading “Common Unit Subscription Amount,” in United States dollars and in immediately available funds. 

“Disclosure Package” means (i) the Prospectus, (ii) the Prospectus Supplement, if any, used most
recently prior to the Purchaser’s execution and delivery of this Agreement, (iii) any issuer free writing prospectus, as defined in Rule 433 under the Securities Act (an “Issuer Free Writing Prospectus), (iv) the final term
sheet, if any, prepared and filed in connection with the Offering, (v) any other free writing prospectus, if any, as defined in Rule 405 under the Securities Act (a “Free Writing Prospectus), (vi) oral communication by the Placement
Agent of pricing information, and (vii) with respect to clauses (i) and (ii) each document incorporated therein by reference. 

“Disclosure Schedules” means the Disclosure Schedules of the Company delivered concurrently herewith. 

“Evaluation Date” shall have the meaning ascribed to such term in Section 3.1(s). 

“Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder. 
 “FCPA” means the Foreign Corrupt Practices Act of 1977, as amended. 

“GAAP” shall have the meaning ascribed to such term in Section 3.1(g). 

  
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 “Indebtedness” shall have the meaning ascribed to such term
in Section 3.1(aa). 
 “Intellectual Property Rights” shall have the meaning ascribed to such term in
Section 3.1(p). 
 “Liens” means a lien, charge, pledge, security interest, encumbrance, right of first
refusal, preemptive right or other restriction. 
 “LS” means Lowenstein Sandler LLP, with offices located
at 1251 Avenue of the Americas, New York, New York 10020. 
 “Material Adverse Effect” shall have the
meaning assigned to such term in Section 3.1(b). 
 “Material Permits” shall have the meaning ascribed
to such term in Section 3.1(n). 
 “Offering” means the offering of the Securities pursuant to this
Agreement and the Disclosure Package. 
 “Per Common Unit Purchase Price” equals $3.21, subject to
adjustment for reverse and forward stock splits, stock dividends, stock combinations and other similar transactions of the Common Stock that occur after the date of this Agreement. 

“Per Pre-Funded Unit Purchase Price” equals $3.20, subject to
adjustment for reverse and forward stock splits, stock dividends, stock combinations and other similar transactions of the Common Stock that occur after the date of this Agreement. 

“Person” means an individual or corporation, partnership, trust, incorporated or unincorporated association,
joint venture, limited liability company, joint stock company, government (or an agency or subdivision thereof) or other entity of any kind. 

“Placement Agent” means Roth Capital Partners, LLC. 

“Pre-Funded Warrants” means, collectively, the Common Stock purchase
warrants delivered to the Purchasers at the Closing in accordance with Section 2.2(a) hereof, which Pre-Funded Warrants shall be exercisable from the date of issuance in the form of Exhibit A
attached hereto. 
 “Pre-Funded Warrant Shares” means the shares of
Common Stock issuable upon exercise of the Pre-Funded Warrants. 
 “Pre-Funded Unit” means a fixed combination of one Pre-Funded Warrant to purchase one Pre-Funded Warrant Share and one Warrant
to purchase one Warrant Share. 
 “Pre-Funded Unit Subscription
Amount” means, as to each Purchaser, the aggregate amount to be paid for Pre-Funded Units purchased hereunder as specified below such Purchaser’s name on the signature page of this Agreement and
next to the heading “Common Unit Subscription Amount,” in United States dollars and in immediately available funds. 

  
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 “Proceeding” means an action, claim, suit, investigation or
proceeding (including, without limitation, an informal investigation or partial proceeding, such as a deposition), whether commenced or threatened. 

“Prospectus” means the final prospectus filed for the Registration Statement. 

“Prospectus Supplement” means the supplement to the Prospectus complying with Rule 424(b) of the Securities
Act that is filed with the Commission and delivered by the Company to each Purchaser at or prior to the Closing. 

“Purchaser Party” shall have the meaning ascribed to such term in Section 4.7. 

“Registration Statement” means the effective registration statement with Commission file No. 333-217034 which registers the sale of the Shares, the Pre-Funded Warrants, the Pre-Funded Warrant Shares, the Warrants and
the Warrant Shares. 
 “Required Approvals” shall have the meaning ascribed to such term in
Section 3.1(e). 
 “Rule 144” means Rule 144 promulgated by the Commission pursuant to the Securities
Act, as such Rule may be amended or interpreted from time to time, or any similar rule or regulation hereafter adopted by the Commission having substantially the same purpose and effect as such Rule. 

“Rule 424” means Rule 424 promulgated by the Commission pursuant to the Securities Act, as such Rule may be
amended or interpreted from time to time, or any similar rule or regulation hereafter adopted by the Commission having substantially the same purpose and effect as such Rule. 

“SEC Reports” shall have the meaning ascribed to such term in Section 3.1(h). 

“Securities” means, collectively, the Shares, the Pre-Funded Warrants,
the Pre-Funded Warrant Shares and the Warrant Shares. 
 “Securities
Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder. 

“Shares” means the shares of Common Stock issued or issuable to each Purchaser pursuant to this Agreement.

 “Short Sales” means all “short sales” as defined in Rule 200 of Regulation SHO under the
Exchange Act (but shall not be deemed to include locating and/or borrowing shares of Common Stock).

  
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 “Subscription Amount” means, as to each Purchaser, the
aggregate amount to be paid for Common Units and Pre-Funded Units purchased hereunder as specified below such Purchaser’s name on the signature page of this Agreement and next to the heading
“Subscription Amount,” in United States dollars and in immediately available funds. 

“Subsidiary” means any subsidiary of the Company as set forth on Schedule 3.1(a), and shall, where
applicable, also include any direct or indirect subsidiary of the Company formed or acquired after the date hereof. 

“Trading Day” means a day on which the principal Trading Market is open for trading. 

“Trading Market” means any of the following markets or exchanges on which the Common Stock is listed or quoted
for trading on the date in question: the NYSE American, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market, the New York Stock Exchange, OTCQB or OTCQX (or any successors to any of the foregoing). 

“Transaction Documents” means this Agreement, the Pre-Funded Warrants,
the Warrants, all exhibits and schedules thereto and hereto and any other documents or agreements executed in connection with the transactions contemplated hereunder. 

“Transfer Agent” means Continental Stock Transfer & Trust Company, the current transfer agent of the
Company, with a mailing address of 1 State Street 30th Floor, New York, NY 10004-1561 and a facsimile number of 212-616-7615, and any successor transfer agent of the
Company. 
 “Units” means, collectively, Common Units and Pre-Funded
Units. 
 “Warrants” means, collectively, the Common Stock purchase warrants delivered to the Purchasers at
the Closing in accordance with Section 2.2(a) hereof, which Warrants shall be exercisable from the date of issuance and have a term of exercise equal to five (5) years from the initial exercise date, in the form of Exhibit B
attached hereto. 
 “Warrant Shares” means the shares of Common Stock issuable upon exercise of the
Warrants. 
 ARTICLE II. 

PURCHASE AND SALE 
 2.1
Closing. On the Closing Date, upon the terms and subject to the conditions set forth herein, substantially concurrent with the execution and delivery of this Agreement by the parties hereto, the Company agrees to sell, and the Purchasers,
severally and not jointly, agree to purchase, up to an aggregate of $13,999,997.70 of Units. Each Purchaser’s Subscription Amount as set forth on the signature page hereto executed by such Purchaser shall be made available for “Delivery
Versus Payment” settlement with the Company or its designee. The Company shall deliver to each Purchaser its respective Shares, Pre-Funded Warrants, if any, and Warrants, and the Company and each
Purchaser shall deliver the other items set forth in Section 2.2 deliverable 

  
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at the Closing. Upon satisfaction of the covenants and conditions set forth in Sections 2.2 and 2.3, the Closing shall occur at the offices of LS or such other location as the parties shall
mutually agree. Unless otherwise directed by the Placement Agent, settlement of the Shares, the Pre-Funded Warrants and the Warrants shall occur via “Delivery Versus Payment”
(“DVP”) (i.e., on the Closing Date, the Company shall issue the Shares registered in the Purchasers’ names and addresses and released by the Transfer Agent directly to the account(s) at the Placement Agent identified by
each Purchaser; upon receipt of such Shares, the Placement Agent shall promptly electronically deliver such Shares to the applicable Purchaser, and payment therefor shall be made by the Placement Agent (or its clearing firm) by wire transfer to the
Company), and delivery of the Pre-Funded Warrants and the Warrants shall be made by physical delivery to be received or directed by each Purchaser no later than one (1) business day following the Closing
Date. 
 2.2 Deliveries. 

(a) On or prior to the Closing Date, the Company shall deliver or cause to be delivered to each Purchaser the following: 

(i) this Agreement duly executed by the Company; 

(ii) subject to the last sentence of Section 2.1, the Company shall have provided each Purchaser with the Company’s
wire instructions, on Company letterhead and executed by the Chief Executive Officer or Chief Financial Officer; 
 (iii)
subject to the last sentence of Section 2.1, a copy of the irrevocable instructions to the Transfer Agent instructing the Transfer Agent to deliver on an expedited basis via The Depository Trust Company Deposit or Withdrawal at Custodian system
(“DWAC”) Shares equal to such Purchaser’s Common Unit Subscription Amount divided by the Per Common Unit Purchase Price, registered in the name of such Purchaser; 

(iv) If applicable, a Pre-Funded Warrant registered in the name of such Purchaser to
purchase up to a number of Pre-Funded Warrant Shares equal to such Purchaser’s Pre-Funded Warrant Subscription Amount, with an exercise price equal to $0.01 per
share, subject to adjustment therein; 
 (v) A Warrant registered in the name of such Purchaser to purchase up to a number of
shares of Common Stock equal to 70% of such Purchaser’s Shares and Pre-Funded Warrants, if any, with an exercise price equal to $3.21 per share, subject to adjustment therein; and 

(vi) the Prospectus and Prospectus Supplement (which may be delivered in accordance with Rule 172 under the Securities Act).

 (b) On or prior to the Closing Date, each Purchaser shall deliver or cause to be delivered to the Company, as applicable,
the following: 
 (i) this Agreement duly executed by such Purchaser; and 

  
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 (ii) such Purchaser’s Subscription Amount, which shall be made
available for “Delivery Versus Payment” settlement with the Company or its designee. 
 2.3 Closing Conditions.  

(a) The obligations of the Company hereunder in connection with the Closing are subject to the following conditions being met:

 (i) the accuracy in all material respects (or, to the extent representations or warranties are qualified by materiality or
Material Adverse Effect, in all respects) on the Closing Date of the representations and warranties of the Purchasers contained herein (unless as of a specific date therein in which case they shall be accurate as of such date); 

(ii) all obligations, covenants and agreements of each Purchaser required to be performed at or prior to the Closing Date shall
have been performed; and 
 (iii) the delivery by each Purchaser of the items set forth in Section 2.2(b) of this
Agreement. 
 (b) The respective obligations of the Purchasers hereunder in connection with the Closing are subject to the
following conditions being met: 
 (i) the accuracy in all material respects (or, to the extent representations or warranties
are qualified by materiality or Material Adverse Effect, in all respects) when made and on the Closing Date of the representations and warranties of the Company contained herein (unless as of a specific date therein in which case they shall be
accurate as of such date); 
 (ii) all obligations, covenants and agreements of the Company required to be performed at or
prior to the Closing Date shall have been performed; 
 (iii) the delivery by the Company of the items set forth in
Section 2.2(a) of this Agreement; 
 (iv) there shall have been no Material Adverse Effect with respect to the Company
since the date hereof; and 
 (v) from the date hereof to the Closing Date, trading in the Common Stock shall not have been
suspended by the Commission or the Company’s principal Trading Market for a period in excess of two hours, and, at any time prior to the Closing Date, trading in securities generally as reported by Bloomberg L.P. shall not have been suspended
or limited, or minimum prices shall not have been established on securities whose trades are reported by such service, or on any Trading Market, nor shall a banking moratorium have been declared either by the United States or New York State
authorities nor shall there have occurred any 

  
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material outbreak or escalation of hostilities or other national or international calamity of such magnitude in its effect on, or any material adverse change in, any financial market which, in
each case, in the reasonable judgment of such Purchaser, makes it impracticable or inadvisable to purchase the Shares, the Pre-Funded Warrants, if any, and the Warrants at the Closing. 

ARTICLE III. 

REPRESENTATIONS AND WARRANTIES 

3.1 Representations and Warranties of the Company. Except, in each case, as disclosed in the Disclosure Package, the Company hereby
makes the following representations and warranties to each Purchaser: 
 (a) Subsidiaries. The Company owns, directly
or indirectly, all of the capital stock or other equity interests of each Subsidiary free and clear of any Liens, and all of the issued and outstanding shares of capital stock of each Subsidiary are validly issued and are fully paid, non-assessable and free of preemptive and similar rights to subscribe for or purchase securities. If the Company has no subsidiaries, all other references to the Subsidiaries or any of them in the Transaction
Documents shall be disregarded. 
 (b) Organization and Qualification. The Company and each of the Subsidiaries is an
entity duly incorporated or otherwise organized, validly existing and in good standing under the laws of the jurisdiction of its incorporation or organization, with the requisite power and authority to own and use its properties and assets and to
carry on its business as currently conducted. Neither the Company nor any Subsidiary is in violation nor default of any of the provisions of its respective certificate or articles of incorporation, bylaws or other organizational or charter
documents. Each of the Company and the Subsidiaries is duly qualified to conduct business and is in good standing as a foreign corporation or other entity in each jurisdiction in which the nature of the business conducted or property owned by it
makes such qualification necessary, except where the failure to be so qualified or in good standing, as the case may be, could not have or reasonably be expected to result in: (i) a material adverse effect on the legality, validity or
enforceability of any Transaction Document, (ii) a material adverse effect on the results of operations, assets, business, prospects or condition (financial or otherwise) of the Company and its subsidiaries (each, a
“Subsidiary” and, collectively, the “Subsidiaries”), taken as a whole, or (iii) a material adverse effect on the Company’s ability to perform in any material respect on a timely basis its obligations under any
Transaction Document (any of (i), (ii) or (iii), a “Material Adverse Effect”) and no Proceeding has been instituted in any such jurisdiction revoking, limiting or curtailing or seeking to revoke, limit or curtail such power and
authority or qualification. 
 (c) Authorization; Enforcement. The Company has the requisite corporate power and
authority to enter into and to consummate the transactions contemplated by this Agreement and each of the other Transaction Documents and otherwise to carry out its obligations hereunder and thereunder. The execution and delivery of this Agreement
and each of the other Transaction Documents by the Company and the consummation by it of the transactions contemplated hereby and thereby have been duly authorized by all 

  
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necessary action on the part of the Company and no further action is required by the Company, the Board of Directors or the Company’s stockholders in connection herewith or therewith other
than in connection with the Required Approvals. This Agreement and each other Transaction Document to which it is a party has been (or upon delivery will have been) duly executed by the Company and, when delivered in accordance with the terms hereof
and thereof, will constitute the valid and binding obligation of the Company enforceable against the Company in accordance with its terms, except (i) as limited by general equitable principles and applicable bankruptcy, insolvency,
reorganization, moratorium and other laws of general application affecting enforcement of creditors’ rights generally, (ii) as limited by laws relating to the availability of specific performance, injunctive relief or other equitable
remedies and (iii) insofar as indemnification and contribution provisions may be limited by applicable law. 
 (d) No
Conflicts. The execution, delivery and performance by the Company of this Agreement and the other Transaction Documents to which it is a party, the issuance and sale of the Securities and the consummation by it of the transactions contemplated
hereby and thereby do not and will not (i) conflict with or violate any provision of the Company’s or any Subsidiary’s certificate or articles of incorporation, bylaws or other organizational or charter documents, or
(ii) conflict with, or constitute a default (or an event that with notice or lapse of time or both would become a default) under, result in the creation of any Lien upon any of the properties or assets of the Company or any Subsidiary, or give
to others any rights of termination, amendment, acceleration or cancellation (with or without notice, lapse of time or both) of, any agreement, credit facility, debt or other instrument (evidencing a Company or Subsidiary debt or otherwise) or other
understanding to which the Company or any Subsidiary is a party or by which any property or asset of the Company or any Subsidiary is bound or affected, or (iii) subject to the Required Approvals, conflict with or result in a violation of any
law, rule, regulation, order, judgment, injunction, decree or other restriction of any court or governmental authority to which the Company or a Subsidiary is subject (including federal and state securities laws and regulations), or by which any
property or asset of the Company or a Subsidiary is bound or affected; except as could not have or reasonably be expected to result in a Material Adverse Effect. 

(e) Filings, Consents and Approvals. The Company is not required to obtain any consent, waiver, authorization or order
of, give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental authority or other Person in connection with the execution, delivery and performance by the Company of the Transaction
Documents, other than: (i) the filings required pursuant to Section 4.3 of this Agreement, (ii) the filing with the Commission of the Prospectus Supplement, (iii) application(s) to each applicable Trading Market for the listing
of the Shares, the Pre-Funded Warrant Shares and the Warrant Shares for trading thereon in the time and manner required thereby and (iv) such filings as are required to be made under applicable state
securities laws (collectively, the “Required Approvals”). 
 (f) Issuance of the Shares, the Pre-Funded Warrant Shares and the Warrant Shares; Registration. The Shares are duly authorized and, when issued and paid for in accordance with the applicable Transaction Documents, will be duly and validly
issued, 

  
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fully paid and nonassessable, free and clear of all Liens imposed by the Company. The Pre-Funded Warrant Shares, when issued in accordance with the terms
of the Pre-Funded Warrants, will be validly issued, fully paid and nonassessable, free and clear of all Liens imposed by the Company. The Warrant Shares, when issued in accordance with the terms of the
Warrants, will be validly issued, fully paid and nonassessable, free and clear of all Liens imposed by the Company. The Company has reserved from its duly authorized capital stock the maximum number of shares of Common Stock issuable pursuant to
this Agreement, the Pre-Funded Warrants and the Warrants. The Company has prepared and filed the Registration Statement in conformity with the requirements of the Securities Act, which became effective
on April 6, 2017 (the “Effective Date”), including the Prospectus, and such amendments and supplements thereto as may have been required to the date of this Agreement. The Registration Statement is effective under the
Securities Act and no stop order preventing or suspending the effectiveness of the Registration Statement or suspending or preventing the use of the Prospectus has been issued by the Commission and no proceedings for that purpose have been
instituted or, to the knowledge of the Company, are threatened by the Commission. The Company, if required by the rules and regulations of the Commission, shall file the Prospectus with the Commission pursuant to Rule 424(b). At the time the
Registration Statement and any amendments thereto became effective, at the date of this Agreement and at the Closing Date, the Registration Statement and any amendments thereto conformed and will conform in all material respects to the requirements
of the Securities Act and did not and will not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading; and the Prospectus and any
amendments or supplements thereto, at time the Prospectus or any amendment or supplement thereto was issued and at the Closing Date, conformed and will conform in all material respects to the requirements of the Securities Act and did not and will
not contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The Company was at the time of the
filing of the Registration Statement eligible to use Form S-3. The Company is eligible to use Form S-3 under the Securities Act and it meets the transaction requirements
set forth in General Instruction I.B.1 of Form S-3. 
 (g) Capitalization. The
capitalization of the Company is as set forth in the Disclosure Package and the SEC Reports (defined below). The Company has not issued any capital stock since its most recently filed periodic report under the Exchange Act, other than pursuant to
the exercise of employee stock options under the Company’s stock option plans, the issuance of shares of Common Stock to employees pursuant to the Company’s employee stock purchase plans and pursuant to the conversion and/or exercise of
Common Stock Equivalents outstanding as of the date of the most recently filed periodic report under the Exchange Act. Except as disclosed in the SEC Reports, no Person has any right of first refusal, preemptive right, right of participation, or any
similar right to participate in the transactions contemplated by the Transaction Documents. Except as a result of the purchase and sale of the Shares, the Pre-Funded Warrants and the Warrants, there are no
outstanding options, warrants, scrip rights to subscribe to, calls or commitments of any character whatsoever relating to, or securities, rights or obligations convertible into or exercisable or exchangeable for, or giving any


  
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Person any right to subscribe for or acquire, any shares of Common Stock or the capital stock of any Subsidiary, or contracts, commitments, understandings or arrangements by which the Company or
any Subsidiary is or may become bound to issue additional shares of Common Stock or Common Stock Equivalents or capital stock of any Subsidiary. The issuance and sale of the Securities will not obligate the Company or any Subsidiary to issue shares
of Common Stock or other securities to any Person (other than the Purchasers) and, except as disclosed in the SEC Reports, will not result in a right of any holder of Company securities to adjust the exercise, conversion, exchange or reset price
under any of such securities. There are no outstanding securities or instruments of the Company or any Subsidiary that contain any redemption or similar provisions, and there are no contracts, commitments, understandings or arrangements by which the
Company or any Subsidiary is or may become bound to redeem a security of the Company or such Subsidiary. The Company does not have any stock appreciation rights or “phantom stock” plans or agreements or any similar plan or agreement. All
of the outstanding shares of capital stock of the Company are duly authorized, validly issued, fully paid and nonassessable, have been issued in compliance with all federal and state securities laws, and none of such outstanding shares was issued in
violation of any preemptive rights or similar rights to subscribe for or purchase securities. No further approval or authorization of any stockholder, the Board of Directors or others is required for the issuance and sale of the Securities. There
are no stockholders agreements, voting agreements or other similar agreements with respect to the Company’s capital stock to which the Company is a party or, to the knowledge of the Company, between or among any of the Company’s
stockholders. 
 (h) SEC Reports; Financial Statements. The Company has filed all reports, schedules, forms,
statements and other documents required to be filed by the Company under the Securities Act and the Exchange Act, including pursuant to Section 13(a) or 15(d) thereof, for the two years preceding the date hereof (or such shorter period as the
Company was required by law or regulation to file such material) (the foregoing materials, including the exhibits thereto and documents incorporated by reference therein, together with the Prospectus and the Prospectus Supplement, being collectively
referred to herein as the “SEC Reports”) on a timely basis or has received a valid extension of such time of filing and has filed any such SEC Reports prior to the expiration of any such extension. As of their respective dates, the
SEC Reports complied in all material respects with the requirements of the Securities Act and the Exchange Act, as applicable, and none of the SEC Reports, when filed, contained any untrue statement of a material fact or omitted to state a material
fact required to be stated therein or necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The Company has not in the past five (5) years been an issuer subject to Rule
144(i) under the Securities Act. The financial statements of the Company included in the SEC Reports comply in all material respects with applicable accounting requirements and the rules and regulations of the Commission with respect thereto as in
effect at the time of filing. Such financial statements have been prepared in accordance with United States generally accepted accounting principles applied on a consistent basis during the periods involved (“GAAP”), except as may
be otherwise specified in such financial statements or the notes thereto and except that unaudited financial statements may not contain all footnotes required by GAAP, and fairly present in all material respects the financial position of the Company
and its consolidated Subsidiaries as of and for the dates thereof and the results of operations and cash flows for the periods then ended, subject, in the case of unaudited statements, to normal, immaterial,
year-end audit adjustments. 

  
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 (i) Material Changes; Undisclosed Events, Liabilities or
Developments. Since the date of the latest audited financial statements included within the SEC Reports, except as set forth in the SEC Reports and the Disclosure Package (i) there has been no event, occurrence or development that has had
or that could reasonably be expected to result in a Material Adverse Effect, (ii) the Company has not incurred any liabilities (contingent or otherwise) other than (A) trade payables and accrued expenses incurred in the ordinary course of
business consistent with past practice and (B) liabilities not required to be reflected in the Company’s financial statements pursuant to GAAP or disclosed in filings made with the Commission, (iii) the Company has not altered its
method of accounting, (iv) the Company has not declared or made any dividend or distribution of cash or other property to its stockholders or purchased, redeemed or made any agreements to purchase or redeem any shares of its capital stock and
(v) the Company has not issued any equity securities to any officer, director or Affiliate, except pursuant to existing Company stock option plans. The Company does not have pending before the Commission any request for confidential treatment
of information. 
 (j) Litigation. There is no Action which (i) adversely affects or challenges the legality,
validity or enforceability of any of the Transaction Documents or the Securities or (ii) could, if there were an unfavorable decision, have or reasonably be expected to result in a Material Adverse Effect. Neither the Company nor any
Subsidiary, nor any director or officer thereof, is or has been the subject of any Action involving a claim of violation of or liability under federal or state securities laws or a claim of breach of fiduciary duty. There has not been, and to the
knowledge of the Company, there is not pending or contemplated, any investigation by the Commission involving the Company or any current or former director or officer of the Company. The Commission has not issued any stop order or other order
suspending the effectiveness of any registration statement filed by the Company or any Subsidiary under the Exchange Act or the Securities Act. 

(k) Labor Relations. No labor dispute exists or, to the knowledge of the Company, is imminent with respect to any of the
employees of the Company, which could reasonably be expected to result in a Material Adverse Effect. None of the Company’s or its Subsidiaries’ employees is a member of a union that relates to such employee’s relationship with the
Company or such Subsidiary, and neither the Company nor any of its Subsidiaries is a party to a collective bargaining agreement, and the Company and its Subsidiaries believe that their relationships with their employees are good. To the knowledge of
the Company, no executive officer of the Company or any Subsidiary, is, or is now expected to be, in violation of any material term of any employment contract, confidentiality, disclosure or proprietary information agreement or non-competition agreement, or any other contract or agreement or any restrictive covenant in favor of any third party, and the continued employment of each such executive officer does not subject the Company or any
of its Subsidiaries to any liability with respect to any of the foregoing matters. The Company and its Subsidiaries are in 

  
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compliance with all U.S. federal, state, local and foreign laws and regulations relating to employment and employment practices, terms and conditions of employment and wages and hours, except
where the failure to be in compliance could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. 

(l) Compliance. Neither the Company nor any Subsidiary: (i) is in default under or in violation of (and no event
has occurred that has not been waived that, with notice or lapse of time or both, would result in a default by the Company or any Subsidiary under), nor has the Company or any Subsidiary received notice of a claim that it is in default under or that
it is in violation of, any indenture, loan or credit agreement or any other agreement or instrument to which it is a party or by which it or any of its properties is bound (whether or not such default or violation has been waived), (ii) is in
violation of any judgment, decree or order of any court, arbitrator or other governmental authority or (iii) is or has been in violation of any statute, rule, ordinance or regulation of any governmental authority, including without limitation
all foreign, federal, state and local laws relating to taxes, environmental protection, occupational health and safety, product quality and safety and employment and labor matters, except in each case as could not have or reasonably be expected to
result in a Material Adverse Effect. 
 (m) Environmental Laws. The Company and its Subsidiaries (i) are in
compliance with all federal, state, local and foreign laws relating to pollution or protection of human health or the environment (including ambient air, surface water, groundwater, land surface or subsurface strata), including laws relating to
emissions, discharges, releases or threatened releases of chemicals, pollutants, contaminants, or toxic or hazardous substances or wastes (collectively, “Hazardous Materials”) into the environment, or otherwise relating to the
manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials, as well as all authorizations, codes, decrees, demands, or demand letters, injunctions, judgments, licenses, notices or notice
letters, orders, permits, plans or regulations, issued, entered, promulgated or approved thereunder (“Environmental Laws”); (ii) have received all permits licenses or other approvals required of them under applicable Environmental
Laws to conduct their respective businesses; and (iii) are in compliance with all terms and conditions of any such permit, license or approval where in each clause (i), (ii) and (iii), the failure to so comply could be reasonably expected to
have, individually or in the aggregate, a Material Adverse Effect. 
 (n) Regulatory Permits. The Company and the
Subsidiaries possess all certificates, authorizations and permits issued by the appropriate federal, state, local or foreign regulatory authorities necessary to conduct their respective businesses as described in the SEC Reports, except where the
failure to possess such permits could not reasonably be expected to result in a Material Adverse Effect (“Material Permits”), and neither the Company nor any Subsidiary has received any notice of proceedings relating to the
revocation or modification of any Material Permit. 

  
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 (o) Title to Assets. The Company and the Subsidiaries have good and
marketable title in fee simple to all real property owned by them and good and marketable title in all personal property owned by them that is material to the business of the Company and the Subsidiaries, in each case free and clear of all Liens,
except for (i) Liens as do not materially affect the value of such property and do not materially interfere with the use made and proposed to be made of such property by the Company and the Subsidiaries and (ii) Liens for the payment of
federal, state or other taxes, for which appropriate reserves have been made therefor in accordance with GAAP and, the payment of which is neither delinquent nor subject to penalties. Any real property and facilities held under lease by the Company
and the Subsidiaries are held by them under valid, subsisting and enforceable leases with which the Company and the Subsidiaries are in compliance. 

(p) Intellectual Property. The Company and the Subsidiaries have, or have rights to use, all patents, patent
applications, trademarks, trademark applications, service marks, trade names, trade secrets, inventions, copyrights, licenses and other intellectual property rights and similar rights necessary or required for use in connection with their respective
businesses as described in the SEC Reports and which the failure to so have could have a Material Adverse Effect (collectively, the “Intellectual Property Rights”). None of, and neither the Company nor any Subsidiary has received a
notice (written or otherwise) that any of, the Intellectual Property Rights has expired, terminated or been abandoned, or is expected to expire or terminate or be abandoned, within two (2) years from the date of this Agreement. Neither the
Company nor any Subsidiary has received, since the date of the latest audited financial statements included within the SEC Reports, a written notice of a claim or otherwise has any knowledge that the Intellectual Property Rights violate or infringe
upon the rights of any Person, except as could not have or reasonably be expected to not have a Material Adverse Effect. To the knowledge of the Company, all such Intellectual Property Rights are enforceable and there is no existing infringement by
another Person of any of the Intellectual Property Rights. The Company and its Subsidiaries have taken reasonable security measures to protect the secrecy, confidentiality and value of all of their intellectual properties, except where failure to do
so could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. 
 (q)
Insurance. The Company and the Subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which the Company and the
Subsidiaries are engaged, including, but not limited to, directors and officers insurance coverage at least equal to the aggregate Subscription Amount. 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 a Material Adverse Effect. 

(r) Transactions With Affiliates and Employees. Except as disclosed in the SEC Reports, none of the officers or
directors of the Company or any Subsidiary and, to the knowledge of the Company, none of the employees of the Company or any Subsidiary is presently a party to any transaction with the Company or any Subsidiary (other than for services as employees,
officers and directors), including any contract, agreement or other arrangement providing for the furnishing of services to or by, providing for rental of real or personal property to or from, providing for the borrowing


  
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of money from or lending of money to or otherwise requiring payments to or from any officer, director or such employee or, to the knowledge of the Company, any entity in which any officer,
director, or any such employee has a substantial interest or is an officer, director, trustee, stockholder, member or partner, in each case in excess of $120,000 other than for (i) payment of salary or consulting fees for services rendered,
(ii) reimbursement for expenses incurred on behalf of the Company and (iii) other employee benefits, including stock option agreements under any stock option plan of the Company. 

(s) Sarbanes-Oxley; Internal Accounting Controls. The Company and the Subsidiaries are in material compliance with any
and all applicable requirements of the Sarbanes-Oxley Act of 2002 that are effective as of the date hereof, and any and all applicable rules and regulations promulgated by the Commission thereunder that are effective as of the date hereof and as of
the Closing Date. The Company and the Subsidiaries maintain a system of internal accounting controls sufficient to provide reasonable assurance that: (i) transactions are executed in accordance with management’s general or specific
authorizations, (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain asset accountability, (iii) access to assets is permitted only in accordance with
management’s general or specific authorization, and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. The Company and
the Subsidiaries have established disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the Company and the Subsidiaries and
designed such disclosure controls and procedures to ensure that information required to be disclosed by the Company in the reports it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods
specified in the Commission’s rules and forms. The Company’s certifying officers have evaluated the effectiveness of the disclosure controls and procedures of the Company and the Subsidiaries as of the end of the period covered by the most
recently filed periodic report under the Exchange Act (such date, the “Evaluation Date”). The Company presented in its most recently filed periodic report under the Exchange Act the conclusions of the certifying officers about the
effectiveness of the disclosure controls and procedures based on their evaluations as of the Evaluation Date. Since the Evaluation Date, there have been no changes in the internal control over financial reporting (as such term is defined in the
Exchange Act) of the Company and its Subsidiaries that have materially affected, or is reasonably likely to materially affect, the internal control over financial reporting of the Company and its Subsidiaries. 

(t) Certain Fees. Except as set forth in the Prospectus Supplement, no brokerage or finder’s fees or commissions
are or will be payable by the Company or any Subsidiary to any broker, financial advisor or consultant, finder, placement agent, investment banker, bank or other Person with respect to the transactions contemplated by the Transaction Documents. The
Purchasers shall have no obligation with respect to any fees or with respect to any claims made by or on behalf of other Persons for fees of a type contemplated in this Section that may be due in connection with the transactions contemplated by the
Transaction Documents. 

  
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 (u) Investment Company. The Company is not, and is not an Affiliate
of, and immediately after receipt of payment for the Shares, the Pre-Funded Warrants, if any, and the Warrants, will not be or be an Affiliate of, an “investment company” within the meaning of the
Investment Company Act of 1940, as amended. The Company shall conduct its business in a manner so that it will not become an “investment company” subject to registration under the Investment Company Act of 1940, as amended. 

(v) Registration Rights. No Person has any right to cause the Company or any Subsidiary to effect the registration under
the Securities Act of any securities of the Company or any Subsidiary. 
 (w) Listing and Maintenance Requirements.
The Common Stock is registered pursuant to Section 12(b) or 12(g) of the Exchange Act, and the Company has taken no action designed to, or which to its knowledge is likely to have the effect of, terminating the registration of the Common Stock
under the Exchange Act nor has the Company received any notification that the Commission is contemplating terminating such registration. The Company has not, in the 12 months preceding the date hereof, received notice from any Trading Market on
which the Common Stock is or has been listed or quoted to the effect that the Company is not in compliance with the listing or maintenance requirements of such Trading Market. The Company is, and has no reason to believe that it will not in the
foreseeable future continue to be, in compliance with all such listing and maintenance requirements. The Common Stock is currently eligible for electronic transfer through the Depository Trust Company or another established clearing corporation and
the Company is current in payment of the fees to the Depository Trust Company (or such other established clearing corporation) in connection with such electronic transfer. 

(x) Application of Takeover Protections. The Company and the Board of Directors have taken all necessary action, if any,
in order to render inapplicable any control share acquisition, business combination, poison pill (including any distribution under a rights agreement) or other similar anti-takeover provision under the
Company’s certificate of incorporation (or similar charter documents) or the laws of its state of incorporation that is or could become applicable to the Purchasers as a result of the Purchasers and the Company fulfilling their obligations or
exercising their rights under the Transaction Documents, including without limitation as a result of the Company’s issuance of the Securities and the Purchasers’ ownership of the Securities. 

(y) Disclosure. Except with respect to the material terms and conditions of the transactions contemplated by the
Transaction Documents, the Company confirms that neither it nor any other Person acting on its behalf has provided any of the Purchasers or their agents or counsel with any information that it believes constitutes or might constitute material, non-public information which is not otherwise disclosed in the Prospectus Supplement or the Disclosure Package. The Company understands and confirms that the Purchasers will rely on the foregoing representation in
effecting transactions in securities of the Company. The disclosure furnished by or on behalf of the Company to the Purchasers regarding the Company and its Subsidiaries, their respective businesses and the transactions contemplated hereby in the
Disclosure Package does not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements made therein, in the light of the circumstances under which they were made, not misleading. 


  
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 (z) No Integrated Offering. Assuming the accuracy of the
Purchasers’ representations and warranties set forth in Section 3.2, neither the Company, nor any of its Affiliates, nor any Person acting on its or their behalf has, directly or indirectly, made any offers or sales of any security or
solicited any offers to buy any security, under circumstances that would cause this offering of the Securities to be integrated with prior offerings by the Company for purposes of any applicable shareholder approval provisions of any Trading Market
on which any of the securities of the Company are listed or designated. 
 (aa) Tax Status. Except for matters that
would not, individually or in the aggregate, have or reasonably be expected to result in a Material Adverse Effect, the Company and its Subsidiaries each (i) has made or filed all United States federal, state and local income and all foreign
income and franchise tax returns, reports and declarations required by any jurisdiction to which it is subject, (ii) has paid all taxes and other governmental assessments and charges that are material in amount, shown or determined to be due on
such returns, reports and declarations and (iii) has set aside on its books provision reasonably adequate for the payment of all material taxes for periods subsequent to the periods to which such returns, reports or declarations apply. There
are no unpaid taxes in any material amount claimed to be due by the taxing authority of any jurisdiction, and the officers of the Company or of any Subsidiary know of no basis for any such claim. 

(bb) Foreign Corrupt Practices. Neither the Company nor any Subsidiary, nor to the knowledge of the Company or any
Subsidiary, any agent or other person acting on behalf of the Company or any Subsidiary, has (i) directly or indirectly, used any funds for unlawful contributions, gifts, entertainment or other unlawful expenses related to foreign or domestic
political activity, (ii) made any unlawful payment to foreign or domestic government officials or employees or to any foreign or domestic political parties or campaigns from corporate funds, (iii) failed to disclose fully any contribution
made by the Company or any Subsidiary (or made by any person acting on its behalf of which the Company is aware) which is in violation of law, or (iv) violated in any material respect any provision of FCPA. 

(cc) Accountants. To the knowledge of the Company, the accounting firm certifying its financial statements in the
Disclosure Package (i) is a registered public accounting firm as required by the Exchange Act and (ii) shall express its opinion with respect to the financial statements to be included in the Company’s Annual Report for the fiscal
year ending December 31, 2018. 
 (dd) Acknowledgment Regarding Purchasers’ Purchase of Securities. The
Company acknowledges and agrees that each of the Purchasers is acting solely in the capacity of an arm’s length purchaser with respect to the Transaction Documents and the transactions contemplated thereby. The Company further acknowledges that
no 

  
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Purchaser is acting as a financial advisor or fiduciary of the Company (or in any similar capacity) with respect to the Transaction Documents and the transactions contemplated thereby and any
advice given by any Purchaser or any of their respective representatives or agents in connection with the Transaction Documents and the transactions contemplated thereby is merely incidental to the Purchasers’ purchase of the Securities. The
Company further represents to each Purchaser that the Company’s decision to enter into this Agreement and the other Transaction Documents has been based solely on the independent evaluation of the transactions contemplated hereby by the Company
and its representatives. 
 (ee) Acknowledgment Regarding Purchaser’s Trading Activity. Anything in this
Agreement or elsewhere herein to the contrary notwithstanding (except for Sections 3.2(f) and 4.9 hereof), it is understood and acknowledged by the Company that: (i) none of the Purchasers has been asked by the Company to agree, nor has any
Purchaser agreed, to desist from purchasing or selling, long and/or short, securities of the Company, or “derivative” securities based on securities issued by the Company or to hold the Securities for any specified term; (ii) past
(prior to the time at which the Placement Agent first contacted such Investor about the Offering), or future open market or other transactions by any Purchaser, specifically including, without limitation, Short Sales or “derivative”
transactions, before or after the closing of this or future private placement transactions, may negatively impact the market price of the Company’s publicly-traded securities; (iii) any Purchaser, and counter-parties in
“derivative” transactions to which any such Purchaser is a party, directly or indirectly, presently may have a “short” position in the Common Stock (established prior to the time at which the Placement Agent first contacted such
Investor about the Offering), and (iv) each Purchaser shall not be deemed to have any affiliation with or control over any arm’s length counter-party in any “derivative” transaction. The Company further understands and
acknowledges that (y) one or more Purchasers may engage in hedging activities at various times during the period that the Securities are outstanding, and (z) such hedging activities (if any) could reduce the value of the existing
stockholders’ equity interests in the Company at and after the time that the hedging activities are being conducted. The Company acknowledges that such aforementioned hedging activities do not constitute a breach of any of the Transaction
Documents. 
 (ff) Regulation M Compliance. The Company has not, and to its knowledge no one acting on its behalf
has, (i) taken, directly or indirectly, any action designed to cause or to result in the stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of any of the Securities, (ii) sold, bid
for, purchased, or, paid any compensation for soliciting purchases of, any of the Securities, or (iii) paid or agreed to pay to any Person any compensation for soliciting another to purchase any other securities of the Company, other than, in
the case of clauses (ii) and (iii), compensation paid to the Company’s placement agent in connection with the placement of the Shares, the Pre-Funded Warrants and the Warrants. 

(gg) Office of Foreign Assets Control. Neither the Company nor any Subsidiary nor, to the Company’s knowledge, any
director, officer, agent, employee or affiliate of the Company or any Subsidiary is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”). 

  
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 (hh) U.S. Real Property Holding Corporation. The Company is not and
has never been a U.S. real property holding corporation within the meaning of Section 897 of the Internal Revenue Code of 1986, as amended, and the Company shall so certify upon Purchaser’s request. 

(ii) Bank Holding Company Act. Neither the Company nor any of its Subsidiaries or Affiliates is subject to the Bank
Holding Company Act of 1956, as amended (the “BHCA”) and to regulation by the Board of Governors of the Federal Reserve System (the “Federal Reserve”). Neither the Company nor any of its Subsidiaries or Affiliates
owns or controls, directly or indirectly, five percent (5%) or more of the outstanding shares of any class of voting securities or twenty-five percent or more of the total equity of a bank or any entity that is subject to the BHCA and to regulation
by the Federal Reserve. Neither the Company nor any of its Subsidiaries or Affiliates exercises a controlling influence over the management or policies of a bank or any entity that is subject to the BHCA and to regulation by the Federal Reserve.

 (jj) Money Laundering. The operations of the Company and its Subsidiaries are and have been conducted at all times
in compliance with applicable financial record-keeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, applicable money laundering statutes and applicable rules and regulations thereunder
(collectively, the “Money Laundering Laws”), and no Action or Proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any Subsidiary with respect to the Money Laundering
Laws is pending or, to the knowledge of the Company or any Subsidiary, threatened. 
 3.2 Representations and Warranties of the
Purchasers. Each Purchaser, for itself and for no other Purchaser, hereby represents and warrants as of the date hereof and as of the Closing Date to the Company as follows (unless as of a specific date therein, in which case they shall be
accurate as of such date): 
 (a) Organization; Authority. Such Purchaser is either an individual or an entity duly
incorporated or formed, validly existing and in good standing under the laws of the jurisdiction of its incorporation or formation with full right, corporate, partnership limited liability company or similar power and authority to enter into and to
consummate the transactions contemplated by the Transaction Documents and otherwise to carry out its obligations hereunder and thereunder. The execution and delivery of the Transaction Documents and performance by such Purchaser of the transactions
contemplated by the Transaction Documents have been duly authorized by all necessary corporate, partnership, limited liability company or similar action, as applicable, on the part of such Purchaser. Each Transaction Document to which it is a party
has been duly executed by such Purchaser, and when delivered by such Purchaser in accordance with the terms hereof, will constitute the valid and legally binding obligation of such Purchaser, enforceable against it in accordance with its terms,
except: (i) as limited by general equitable principles and applicable bankruptcy, insolvency, reorganization, moratorium and other laws of general 

  
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application affecting enforcement of creditors’ rights generally, (ii) as limited by laws relating to the availability of specific performance, injunctive relief or other equitable
remedies and (iii) insofar as indemnification and contribution provisions may be limited by applicable law. 
 (b)
Understandings or Arrangements. Such Purchaser is acquiring the Securities as principal for its own account and has no direct or indirect arrangement or understandings with any other persons to distribute or regarding the distribution of such
Securities (this representation and warranty not limiting such Purchaser’s right to sell the Securities pursuant to the Registration Statement or otherwise in compliance with applicable federal and state securities laws). Such Purchaser is
acquiring the Securities hereunder in the ordinary course of its business. 
 (c) Purchaser Status. At the time such
Purchaser was offered the Securities, it was, and as of the date hereof it is either: (i) an “accredited investor” as defined in Rule 501(a)(1), (a)(2), (a)(3), (a)(7) or (a)(8) under the Securities Act or (ii) a “qualified
institutional buyer” as defined in Rule 144A(a) under the Securities Act. 
 (d) Experience of Such Purchaser.
Such Purchaser, either alone or together with its representatives, has such knowledge, sophistication and experience in business and financial matters so as to be capable of evaluating the merits and risks of the prospective investment in the
Securities, and has so evaluated the merits and risks of such investment. Such Purchaser is able to bear the economic risk of an investment in the Securities and, at the present time, is able to afford a complete loss of such investment. 

(e) Access to Information. Such Purchaser acknowledges that it has had the opportunity to review the Disclosure Package,
the Transaction Documents (including all exhibits and schedules thereto) and the SEC Reports and has been afforded, (i) the opportunity to ask such questions as it has deemed necessary of, and to receive answers from, representatives of the
Company concerning the terms and conditions of the offering of the Securities and the merits and risks of investing in the Securities; (ii) access to information about the Company and its financial condition, results of operations, business,
properties, management and prospects sufficient to enable it to evaluate its investment; and (iii) the opportunity to obtain such additional information that the Company possesses or can acquire without unreasonable effort or expense that is
necessary to make an informed investment decision with respect to the investment. Such Purchaser acknowledges and agrees that neither the Placement Agent nor any Affiliate of the Placement Agent has provided such Purchaser with any information
or advice with respect to the Securities nor is such information or advice necessary or desired. Neither the Placement Agent nor any Affiliate has made or makes any representation as to the Company or the quality of the Securities and the
Placement Agent and any Affiliate may have acquired non-public information with respect to the Company which such Purchaser agrees need not be provided to it. In connection with the issuance of the
Securities to such Purchaser, neither the Placement Agent nor any of its Affiliates has acted as a financial advisor or fiduciary to such Purchaser. 

  
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 (f) Certain Transactions and Confidentiality. Other than consummating
the transactions contemplated hereunder, since the date on which the Placement Agent first contacted such Purchaser about the Offering, such Purchaser has not, nor has any Person acting on behalf of or pursuant to any understanding with such
Purchaser, directly or indirectly executed any purchases or sales, including Short Sales, of the securities of the Company. Notwithstanding the foregoing, in the case of a Purchaser that is a multi-managed investment vehicle whereby separate
portfolio managers manage separate portions of such Purchaser’s assets and the portfolio managers have no direct knowledge of the investment decisions made by the portfolio managers managing other portions of such Purchaser’s assets, the
representation set forth above shall only apply with respect to the portion of assets managed by the portfolio manager that made the investment decision to purchase the Securities covered by this Agreement. Other than to other Persons party to this
Agreement or to such Purchaser’s representatives, including, without limitation, its officers, directors, partners, legal and other advisors, employees, agents and Affiliates, such Purchaser has maintained the confidentiality of all disclosures
made to it in connection with this transaction (including the existence and terms of this transaction). Notwithstanding the foregoing, for the avoidance of doubt, nothing contained herein shall constitute a representation or warranty, or preclude
any actions, with respect to locating or borrowing shares in order to effect Short Sales or similar transactions in the future. 
 The Company acknowledges
and agrees that the representations contained in this Section 3.2 shall not modify, amend or affect such Purchaser’s right to rely on the Company’s representations and warranties contained in this Agreement or any representations and
warranties contained in any other Transaction Document or any other document or instrument executed and/or delivered in connection with this Agreement or the consummation of the transactions contemplated hereby. Notwithstanding the foregoing, for
the avoidance of doubt, nothing contained herein shall constitute a representation or warranty, or preclude any actions, with respect to locating or borrowing shares in order to effect Short Sales or similar transactions in the future (following
public disclosure of the Offering). 
 ARTICLE IV. 

OTHER AGREEMENTS OF THE PARTIES 

4.1 Pre-Funded Warrant Shares and Warrant Shares. If all or any portion of a Pre-Funded Warrant or a Warrant is exercised at a time when there is an effective registration statement to cover the issuance or resale of the Pre-Funded Warrant Shares or
the Warrant Shares, as applicable, or if the Pre-Funded Warrant or the Warrant is exercised via cashless exercise, the Pre-Funded Warrant Shares or Warrant Shares, as
applicable, issued pursuant to any such exercise shall be issued free of all legends. If at any time following the date hereof the Registration Statement (or any subsequent registration statement registering the sale or resale of the Pre-Funded Warrant Shares or the Warrant Shares, as applicable) is not effective or is not otherwise available for the sale or resale of the Pre-Funded Warrant Shares or the
Warrant Shares, as applicable, the Company shall immediately notify the holders of the Pre-Funded Warrants or the Warrants, as applicable, in writing that such registration statement is not then effective and
thereafter shall promptly notify such holders when the registration statement is effective again and available for the sale or resale of the Pre-Funded Warrant Shares or the Warrant Shares, as applicable (it
being understood and agreed that the foregoing shall not limit 

  
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the ability of the Company to issue, or any Purchaser to sell, any of the Pre-Funded Warrant Shares or the Warrant Shares, as applicable, in compliance
with applicable federal and state securities laws). The Company shall use commercially reasonable efforts to keep a registration statement (including the Registration Statement) registering the issuance or resale of the Pre-Funded Warrant Shares and the Warrant Shares, as applicable, effective during the term of the Pre-Funded Warrants and the Warrants, as applicable. 

4.2 Furnishing of Information. Until the earlier of (i) the time that each Purchaser owns less than twenty percent (20%) of the
Shares and Pre-Funded Warrants, if any, purchased by such Purchaser hereunder and (ii) the date that is ninety (90) days after the date hereof, the Company covenants to timely file (or obtain
extensions in respect thereof and file within the applicable grace period) all reports required to be filed by the Company after the date hereof pursuant to the Exchange Act. 

4.3 Integration. The Company shall not sell, offer for sale or solicit offers to buy or otherwise negotiate in respect of any security
(as defined in Section 2 of the Securities Act) that would be integrated with the offer or sale of the Securities for purposes of the rules and regulations of any Trading Market such that it would require shareholder approval prior to the
closing of such other transaction unless shareholder approval is obtained before the closing of such subsequent transaction. 
 4.4
Securities Laws Disclosure; Publicity. The Company shall (a) by 9:00 a.m. (New York City time) on March 8, 2019 issue a press release disclosing the material terms of the transactions contemplated hereby, and (b) by 9:00 a.m.
(New York City time) on the Trading Day immediately following the date hereof, file a Current Report on Form 8-K, including the Transaction Documents as exhibits thereto, with the Commission within the time
required by the Exchange Act. The Company represents to the Purchasers that, as of the time of the issuance of such press release, it shall have publicly disclosed all material, non-public information
delivered to any of the Purchasers by the Company or any of its Subsidiaries, or any of their respective officers, directors, employees or agents in connection with the transactions contemplated by the Transaction Documents. In addition, effective
upon the issuance of such press release, the Company acknowledges and agrees that any and all confidentiality or similar obligations under any agreement, whether written or oral, between the Company, any of its Subsidiaries or any of their
respective officers, directors, employees, agents or Affiliates on the one hand, and any of the Purchasers or any of their Affiliates on the other hand, shall terminate. No Purchaser shall issue any press release nor otherwise make any public
statement without the prior consent of the Company, which consent shall not unreasonably be withheld or delayed, except if such disclosure is required by law, in which case the disclosing party shall promptly provide the other party with prior
notice of such public statement or communication. Notwithstanding the foregoing, the Company shall not publicly disclose the name of any Purchaser, or include the name of any Purchaser in any filing with the Commission or any regulatory agency or
Trading Market, without the prior written consent of such Purchaser, except (a) as required by federal securities law in connection with the filing of final Transaction Documents with the Commission and (b) to the extent such disclosure is
required by law or Trading Market regulations, in which case the Company shall provide the Purchasers with prior notice of such disclosure permitted under this clause (b). 

  
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 4.5 Shareholder Rights Plan. No claim will be made or enforced by the Company or,
with the consent of the Company, any other Person, that any Purchaser is an “Acquiring Person” under any control share acquisition, business combination, poison pill (including any distribution under a rights agreement) or similar
anti-takeover plan or arrangement in effect or hereafter adopted by the Company, or that any Purchaser could be deemed to trigger the provisions of any such plan or arrangement, solely by virtue of receiving Securities under this Agreement. 

4.6 Non-Public Information. Except with respect to the material terms and conditions of the
transactions contemplated by the Transaction Documents, which shall be disclosed pursuant to Section 4.4, the Company covenants and agrees that neither it, nor any other Person acting on its behalf will provide any Purchaser or its agents or
counsel with any information that constitutes, or the Company reasonably believes constitutes, material non-public information, unless prior thereto such Purchaser shall have consented to the receipt of such
information and agreed with the Company to keep such information confidential. The Company understands and confirms that each Purchaser shall be relying on the foregoing covenant in effecting transactions in securities of the Company. To the extent
that the Company delivers any material, non-public information to a Purchaser without such Purchaser’s consent, the Company hereby covenants and agrees that such Purchaser shall not have any duty of
confidentiality to the Company, any of its Subsidiaries, or any of their respective officers, directors, agents, employees or Affiliates, or a duty to the Company, any of its Subsidiaries or any of their respective officers, directors, agents,
employees or Affiliates not to trade on the basis of, such material, non-public information, provided that the Purchaser shall remain subject to applicable law. To the extent that any notice provided pursuant
to any Transaction Document constitutes, or contains, material, non-public information regarding the Company or any Subsidiaries, the Company shall simultaneously file such notice with the Commission pursuant
to a Current Report on Form 8-K. The Company understands and confirms that each Purchaser shall be relying on the foregoing covenants in this Section 4.5 in effecting transactions in securities of the
Company. 
 4.7 Use of Proceeds. The Company shall use the net proceeds from the sale of the Securities hereunder for working capital,
the conduct of its business as described in the Disclosure Package and other general corporate purposes and shall not use such proceeds: (a) for the satisfaction of any portion of the Company’s debt (other than payment of trade payables
and other liabilities arising in the ordinary course of the Company’s business and prior practices), (b) for the redemption of any Common Stock or Common Stock Equivalents, (c) for the settlement of any outstanding litigation or
(d) in violation of FCPA or OFAC regulations. 
 4.8 Indemnification of Purchasers. Subject to the provisions of this
Section 4.7, the Company will indemnify and hold each Purchaser and its directors, officers, shareholders, members, partners, employees and agents (and any other Persons with a functionally equivalent role of a Person holding such titles
notwithstanding a lack of such title or any other title), each Person who controls such Purchaser (within the meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the directors, officers, shareholders,
agents, members, partners or employees (and any other Persons with a functionally equivalent role of a Person holding such titles notwithstanding a lack of such title or any other title) of such controlling persons (each, a “Purchaser
Party”) harmless from any and all losses, liabilities, obligations, claims, contingencies, damages, costs and expenses, including all judgments, amounts paid in settlements, court costs and reasonable attorneys’ fees and costs of
investigation that any such 

  
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Purchaser Party may suffer or incur as a result of or relating to (a) any breach of any of the representations, warranties, covenants or agreements made by the Company in this Agreement or
in the other Transaction Documents or (b) any action instituted against the Purchaser Parties in any capacity, or any of them or their respective Affiliates, by any stockholder of the Company who is not an Affiliate of such Purchaser Party and
not another Purchaser or an Affiliate of such Purchaser, with respect to any of the transactions contemplated by the Transaction Documents (unless such action is solely based upon a material breach of such Purchaser Party’s representations,
warranties or covenants under the Transaction Documents or any agreements or understandings such Purchaser Party may have with any such stockholder or any violations by such Purchaser Party of state or federal securities laws or any conduct by such
Purchaser Party which is finally judicially determined to constitute fraud, gross negligence or willful misconduct). If any action shall be brought against any Purchaser Party in respect of which indemnity may be sought pursuant to this Agreement,
such Purchaser Party shall promptly notify the Company in writing, and the Company shall have the right to assume the defense thereof with counsel of its own choosing reasonably acceptable to the Purchaser Party. Any Purchaser Party shall have the
right to employ separate counsel in any such action and participate in the defense thereof, but the fees and expenses of such counsel shall be at the expense of such Purchaser Party except to the extent that (i) the employment thereof has been
specifically authorized by the Company in writing, (ii) the Company has failed after a reasonable period of time to assume such defense and to employ counsel or (iii) in such action there is, in the reasonable opinion of counsel, a
material conflict on any material issue between the position of the Company and the position of such Purchaser Party, in which case the Company shall be responsible for the reasonable fees and expenses of no more than one such separate counsel. The
Company will not be liable to any Purchaser Party under this Agreement (y) for any settlement by a Purchaser Party effected without the Company’s prior written consent, which shall not be unreasonably withheld or delayed; or (z) to
the extent, but only to the extent that a loss, claim, damage or liability is attributable to any Purchaser Party’s breach of any of the representations, warranties, covenants or agreements made by such Purchaser Party in this Agreement or in
the other Transaction Documents. The indemnification required by this Section 4.7 shall be made by periodic payments of the amount thereof during the course of the investigation or defense, as and when bills are received or are incurred. The
indemnity agreements contained herein shall be in addition to any cause of action or similar right of any Purchaser Party against the Company or others and any liabilities the Company may be subject to pursuant to law. 

Notwithstanding anything in this Agreement to the contrary, the Company shall not be liable to any Purchaser for any loss incurred as a result of a reduction
in the Company’s stock price caused by selling activity by any of the Purchasers with respect to the Company’s securities. 
 4.9
Reservation of Common Stock. As of the date hereof, the Company has reserved and the Company shall continue to reserve and keep available at all times, free of preemptive rights, a sufficient number of shares of Common Stock for the purpose
of enabling the Company to issue Shares pursuant to this Agreement and Pre-Funded Warrant Shares and Warrant Shares pursuant to any exercise of the Pre-Funded Warrants
and the Warrants, as applicable. 
 4.10 Listing of Common Stock. The Company hereby agrees to use commercially reasonable
efforts to maintain the listing or quotation of the Common Stock on the Trading Market on which it is currently listed, and concurrently with the Closing, the Company shall 

  
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apply to list or quote all of the Shares, the Pre-Funded Warrant Shares and the Warrant Shares on such Trading Market and promptly secure the listing of
all of the Shares, the Pre-Funded Warrant Shares and the Warrant Shares on such Trading Market. The Company further agrees, if the Company applies to have the Common Stock traded on any other Trading Market,
it will then include in such application all of the Shares, the Pre-Funded Warrant Shares and the Warrant Shares, and will take such other action as is necessary to cause all of the Shares, the Pre-Funded Warrant Shares and the Warrant Shares to be listed or quoted on such other Trading Market as promptly as possible. The Company will then take all action reasonably necessary to continue the listing and
trading of its Common Stock on a Trading Market and will comply in all respects with the Company’s reporting, filing and other obligations under the bylaws or rules of the Trading Market. The Company agrees to use commercially reasonable
efforts to maintain the eligibility of the Common Stock for electronic transfer through the Depository Trust Company or another established clearing corporation, including, without limitation, by timely payment of fees to the Depository Trust
Company or such other established clearing corporation in connection with such electronic transfer. 
 4.11 Certain Transactions and
Confidentiality. Each Purchaser, severally and not jointly with the other Purchasers, covenants that neither it nor any Affiliate acting on its behalf or pursuant to any understanding with it will execute any purchases or sales, including Short
Sales of any of the Company’s securities during the period commencing with the execution of this Agreement and ending at such time that the transactions contemplated by this Agreement are first publicly announced pursuant to the initial press
release as described in Section 4.3. Each Purchaser, severally and not jointly with the other Purchasers, covenants that until such time as the transactions contemplated by this Agreement are publicly disclosed by the Company pursuant to
the initial press release as described in Section 4.3, such Purchaser will maintain the confidentiality of the existence and terms of this transaction and the information included in the Disclosure Package. Notwithstanding the foregoing,
and notwithstanding anything contained in this Agreement to the contrary, the Company expressly acknowledges and agrees that (i) no Purchaser makes any representation, warranty or covenant hereby that it will not engage in effecting
transactions in any securities of the Company after the time that the transactions contemplated by this Agreement are first publicly announced pursuant to the initial press release as described in Section 4.3, (ii) no Purchaser shall be
restricted or prohibited from effecting any transactions in any securities of the Company in accordance with applicable securities laws from and after the time that the transactions contemplated by this Agreement are first publicly announced
pursuant to the initial press release as described in Section 4.3 and (iii) no Purchaser shall have any duty of confidentiality or duty not to trade in the securities of the Company to the Company or its Subsidiaries after the issuance of
the initial press release as described in Section 4.3. Notwithstanding the foregoing, in the case of a Purchaser that is a multi-managed investment vehicle whereby separate portfolio managers manage separate portions of such
Purchaser’s assets and the portfolio managers have no direct knowledge of the investment decisions made by the portfolio managers managing other portions of such Purchaser’s assets, the covenant set forth above shall only apply with
respect to the portion of assets managed by the portfolio manager that made the investment decision to purchase the Securities covered by this Agreement. 

4.12 Capital Changes. Until the one year anniversary of the Closing Date, the Company shall not undertake a reverse or forward stock
split or reclassification of the Common Stock without the prior written consent of the Purchasers holding a majority in interest of the Shares and Pre-Funded Warrants. 

  
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 4.13 Termination of Certain Obligations. The obligations of the Company pursuant to
Sections 4.1, 4.5, 4.6, 4.10 and 4.11 shall terminate, with respect to each Purchaser, on the earlier of (i) the time that each Purchaser beneficially owns less than twenty percent (20%) of the Shares and
Pre-Funded Warrants, if any, purchased by such Purchaser hereunder, net of Short Sales and any “derivative” securities acquired by such Purchaser (the “Minimum Ownership Amount”),
and (ii) the date that is ninety (90) days after the date hereof. Upon reasonable request of the Company, each Purchaser shall provide to the Company a representation, which may be by e-mail, as to
whether or not such Purchaser continues to own the Minimum Ownership Amount. 
 4.14 Subsequent Equity Sales. From the date hereof
until sixty (60) days after the Closing Date, neither the Company nor any Subsidiary shall issue, enter into any agreement to issue or announce the issuance or proposed issuance of any shares of Common Stock or Common Stock Equivalents. 

ARTICLE V. 
 MISCELLANEOUS

 5.1 Termination. This Agreement may be terminated by any Purchaser, as to such Purchaser’s obligations hereunder only
and without any effect whatsoever on the obligations between the Company and the other Purchasers, by written notice to the other parties, if the Closing has not been consummated on or before March 12, 2019; provided, however,
that no such termination will affect the right of any party to sue for any breach by any other party (or parties). 
 5.2 Fees and
Expenses. Except as expressly set forth in the Transaction Documents to the contrary, each party shall pay the fees and expenses of its advisers, counsel, accountants and other experts, if any, and all other expenses incurred by such party
incident to the negotiation, preparation, execution, delivery and performance of this Agreement. The Company shall pay all Transfer Agent fees (including, without limitation, any fees required for same-day
processing of any instruction letter delivered by the Company), stamp taxes and other taxes and duties levied in connection with the delivery of any Securities to the Purchasers. 

5.3 Entire Agreement. The Transaction Documents, together with the exhibits and schedules thereto, the Prospectus and the Prospectus
Supplement, contain the entire understanding of the parties with respect to the subject matter hereof and thereof and supersede all prior agreements and understandings, oral or written, with respect to such matters, which the parties acknowledge
have been merged into such documents, exhibits and schedules. 
 5.4 Notices. Any and all notices or other communications or
deliveries required or permitted to be provided hereunder shall be in writing and shall be deemed given and effective on the earliest of: (a) the time of transmission, if such notice or communication is delivered via email attachment at the
email address as set forth on the signature pages attached hereto at or prior to 5:30 p.m. (New York City time) on a Trading Day, (b) the next Trading Day after the 

  
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date of transmission, if such notice or communication is delivered via email attachment at the email address as set forth on the signature pages attached hereto on a day that is not a Trading Day
or later than 5:30 p.m. (New York City time) on any Trading Day, (c) the second (2nd)Trading Day following the date of mailing, if sent by U.S. nationally recognized overnight courier service
or (d) upon actual receipt by the party to whom such notice is required to be given. The address for such notices and communications shall be as set forth on the signature pages attached hereto. To the extent that any notice provided pursuant
to any Transaction Document constitutes, or contains, material, non-public information regarding the Company or any Subsidiaries, the Company shall simultaneously file such notice with the Commission pursuant
to a Current Report on Form 8-K. 
 5.5 Amendments; Waivers. No provision of this Agreement
may be waived, modified, supplemented or amended except in a written instrument signed, in the case of an amendment, by the Company and Purchasers which purchased a majority of the Shares and the Pre-Funded
Warrants, if any, based on the initial Subscription Amounts hereunder or, in the case of a waiver, by the party against whom enforcement of any such waived provision is sought, provided that if any amendment, modification or waiver
disproportionately and adversely impacts a Purchaser (or group of Purchasers) in any material respect, the consent of such disproportionately impacted Purchaser (or group of Purchasers) shall also be required. No waiver of any default with respect
to any provision, condition or requirement of this Agreement shall be deemed to be a continuing waiver in the future or a waiver of any subsequent default or a waiver of any other provision, condition or requirement hereof except to the extent
expressly stated in such waiver, nor shall any delay or omission of any party to exercise any right hereunder in any manner impair the exercise of any such right. Any proposed amendment or waiver that disproportionately, materially and adversely
affects the rights and obligations of any Purchaser relative to the comparable rights and obligations of the other Purchasers shall require the prior written consent of such adversely affected Purchaser. Any amendment effected in accordance with
this Section 5.5 shall be binding upon each Purchaser and holder of Securities and the Company. 
 5.6 Headings. The headings
herein are for convenience only, do not constitute a part of this Agreement and shall not be deemed to limit or affect any of the provisions hereof. 

5.7 Successors and Assigns. This Agreement shall be binding upon and inure to the benefit of the parties and their successors and
permitted assigns. The Company may not assign this Agreement or any rights or obligations hereunder without the prior written consent of each Purchaser (other than by merger). Any Purchaser may assign any or all of its rights under this Agreement to
any Person to whom such Purchaser assigns or transfers any Securities, provided that such transferee agrees in writing to be bound, with respect to the transferred Securities, by the provisions of the Transaction Documents that apply to the
“Purchasers.” 
 5.8 No Third-Party Beneficiaries. This Agreement is intended for the benefit of the parties hereto and
their respective successors and permitted assigns and is not for the benefit of, nor may any provision hereof be enforced by, any other Person, except as otherwise set forth in Section 4.7 and this Section 5.8. 

  
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 5.9 Governing Law. All questions concerning the construction, validity, enforcement
and interpretation of the Transaction Documents shall be governed by and construed and enforced in accordance with the internal laws of the State of New York, without regard to the principles of conflicts of law thereof. Each party agrees that all
legal Proceedings concerning the interpretations, enforcement and defense of the transactions contemplated by this Agreement and any other Transaction Documents (whether brought against a party hereto or its respective affiliates, directors,
officers, shareholders, partners, members, employees or agents) shall be commenced exclusively in the state and federal courts sitting in the City of New York. Each party hereby irrevocably submits to the exclusive jurisdiction of the state and
federal courts sitting in the City of New York, Borough of Manhattan for the adjudication of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein (including with respect to the enforcement
of any of the Transaction Documents), and hereby irrevocably waives, and agrees not to assert in any Action or Proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such Action or Proceeding is improper
or is an inconvenient venue for such Proceeding. Each party hereby irrevocably waives personal service of process and consents to process being served in any such Action or Proceeding by mailing a copy thereof via registered or certified mail or
overnight delivery (with evidence of delivery) to such party at the address in effect for notices to it under this Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained
herein shall be deemed to limit in any way any right to serve process in any other manner permitted by law. If any party shall commence an Action or Proceeding to enforce any provisions of the Transaction Documents, then, in addition to the
obligations of the Company under Section 4.7, the prevailing party in such Action or Proceeding shall be reimbursed by the non-prevailing party for its reasonable attorneys’ fees and other costs and
expenses incurred with the investigation, preparation and prosecution of such Action or Proceeding. 
 5.10 Survival. The
representations and warranties contained herein shall survive the Closing and the delivery of the Shares, the Pre-Funded Warrants and the Warrants. 

5.11 Execution. This Agreement may be executed in two or more counterparts, all of which when taken together shall be considered one and
the same agreement and shall become effective when counterparts have been signed by each party and delivered to each other party, it being understood that the parties need not sign the same counterpart. In the event that any signature is delivered
by facsimile transmission or by e-mail delivery of a “.pdf” format data file, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is
executed) with the same force and effect as if such facsimile or “.pdf” signature page were an original thereof. 
 5.12
Severability. If any term, provision, covenant or restriction of this Agreement is held by a court of competent jurisdiction to be invalid, illegal, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions set
forth herein shall remain in full force and effect and shall in no way be affected, impaired or invalidated, and the parties hereto shall use their commercially reasonable efforts to find and employ an alternative means to achieve the same or
substantially the same result as that contemplated by such term, provision, covenant or restriction. It is hereby stipulated and declared to be the intention of the parties that they would have executed the remaining terms, provisions, covenants and
restrictions without including any of such that may be hereafter declared invalid, illegal, void or unenforceable. 

  
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 5.13 Rescission and Withdrawal Right. Notwithstanding anything to the contrary
contained in (and without limiting any similar provisions of) any of the other Transaction Documents, whenever any Purchaser exercises a right, election, demand or option under a Transaction Document and the Company does not timely perform its
related obligations within the periods therein provided, then such Purchaser may rescind or withdraw, in its sole discretion from time to time upon written notice to the Company, any relevant notice, demand or election in whole or in part without
prejudice to its future actions and rights. 
 5.14 Replacement of Securities. If any certificate or instrument evidencing any
Securities is mutilated, lost, stolen or destroyed, the Company shall issue or cause to be issued in exchange and substitution for and upon cancellation thereof (in the case of mutilation), or in lieu of and substitution therefor, a new certificate
or instrument, but only upon receipt of evidence reasonably satisfactory to the Company of such loss, theft or destruction. The applicant for a new certificate or instrument under such circumstances shall also pay any reasonable third-party costs
(including customary indemnity) associated with the issuance of such replacement Securities. 
 5.15 Remedies. In addition to being
entitled to exercise all rights provided herein or granted by law, including recovery of damages, each of the Purchasers and the Company will be entitled to specific performance under the Transaction Documents. The parties agree that monetary
damages may not be adequate compensation for any loss incurred by reason of any breach of obligations contained in the Transaction Documents and hereby agree to waive and not to assert in any Action for specific performance of any such obligation
the defense that a remedy at law would be adequate. 
 5.16 Payment Set Aside. To the extent that the Company makes a payment or
payments to any Purchaser pursuant to any Transaction Document or a Purchaser enforces or exercises its rights thereunder, and such payment or payments or the proceeds of such enforcement or exercise or any part thereof are subsequently invalidated,
declared to be fraudulent or preferential, set aside, recovered from, disgorged by or are required to be refunded, repaid or otherwise restored to the Company, a trustee, receiver or any other Person under any law (including, without limitation, any
bankruptcy law, state or federal law, common law or equitable cause of action), then to the extent of any such restoration the obligation or part thereof originally intended to be satisfied shall be revived and continued in full force and effect as
if such payment had not been made or such enforcement or setoff had not occurred. 
 5.17 Independent Nature of Purchasers’
Obligations and Rights. The obligations of each Purchaser under any Transaction Document are several and not joint with the obligations of any other Purchaser, and no Purchaser shall be responsible in any way for the performance or non-performance of the obligations of any other Purchaser under any Transaction Document. Nothing contained herein or in any other Transaction Document, and no action taken by any Purchaser pursuant hereto or
thereto, shall be deemed to constitute the Purchasers as a partnership, an association, a joint venture or any other kind of entity, or create a presumption that the Purchasers are in any way acting in concert or as a group with respect to such
obligations 

  
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or the transactions contemplated by the Transaction Documents. Each Purchaser shall be entitled to independently protect and enforce its rights including, without limitation, the rights arising
out of this Agreement or out of the other Transaction Documents, and it shall not be necessary for any other Purchaser to be joined as an additional party in any Proceeding for such purpose. Each Purchaser has been represented by its own separate
legal counsel in its review and negotiation of the Transaction Documents. For reasons of administrative convenience only, each Purchaser and its respective counsel have chosen to communicate with the Company through LS. LS does not represent any of
the Purchasers. The Company has elected to provide all Purchasers with the same terms and Transaction Documents for the convenience of the Company and not because it was required or requested to do so by any of the Purchasers. It is expressly
understood and agreed that each provision contained in this Agreement and in each other Transaction Document is between the Company and a Purchaser, solely, and not between the Company and the Purchasers collectively and not between and among the
Purchasers. Notwithstanding anything to the contrary in the foregoing, each of the Purchasers has been advised, and is being advised by this Agreement, to consult with an attorney before executing this Agreement, and each Purchaser has consulted (or
had an opportunity to consult) with counsel of such Purchaser’s choice concerning the terms and conditions of this Agreement and the other Transaction Documents for a reasonable period of time prior to the execution hereof and thereof. 

5.18 Saturdays, Sundays, Holidays, etc. If the last or appointed day for the taking of any action or the expiration of any right
required or granted herein shall not be a Business Day, then such action may be taken or such right may be exercised on the next succeeding Business Day. 

5.19 Construction. The parties agree that each of them and/or their respective counsel have reviewed and had an opportunity to revise
the Transaction Documents and, therefore, the normal rule of construction to the effect that any ambiguities are to be resolved against the drafting party shall not be employed in the interpretation of the Transaction Documents or any amendments
thereto. In addition, each and every reference to share prices and shares of Common Stock in any Transaction Document shall be subject to adjustment for reverse and forward stock splits, stock dividends, stock combinations and other similar
transactions of the Common Stock that occur after the date of this Agreement. 
 5.20 WAIVER OF JURY TRIAL. IN ANY
ACTION, SUIT, OR PROCEEDING IN ANY JURISDICTION BROUGHT BY ANY PARTY AGAINST ANY OTHER PARTY, THE PARTIES EACH KNOWINGLY AND INTENTIONALLY, TO THE GREATEST EXTENT PERMITTED BY APPLICABLE LAW, HEREBY ABSOLUTELY, UNCONDITIONALLY, IRREVOCABLY AND
EXPRESSLY WAIVES FOREVER TRIAL BY JURY.  
 (Signature Pages Follow) 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Securities Purchase Agreement to be
duly executed by their respective authorized signatories as of the date first indicated above. 
  

							
	ALTIMMUNE, INC.	  		  	 Address for Notice:
  

910 Clopper Road, Suite 201S
 Gaithersburg, Maryland 20878

 

	By:	 	  
	  	            	  	E-Mail: vgarg@altimmune.com
		 	Name:	  		  	
		 	Title:	  		  	

 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK 

SIGNATURE PAGE FOR PURCHASER FOLLOWS] 

  
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 PURCHASER SIGNATURE PAGES TO SECURITIES PURCHASE AGREEMENT 

IN WITNESS WHEREOF, the undersigned have caused this Securities Purchase Agreement to be duly executed by their respective authorized
signatories as of the date first indicated above. 
 Name of Purchaser: ________________________________________________________ 

Signature of Authorized Signatory of Purchaser: _________________________________ 

Name of Authorized Signatory: _______________________________________________ 

Title of Authorized Signatory: ________________________________________________ 

Email Address of Authorized Signatory:_________________________________________ 

Address for Notice to Purchaser: 
 Address for Delivery of
Securities to Purchaser (if not same as address for notice): 
 Common Unit Subscription Amount: $_________________ 

Common Units: _________________ 

Pre-Funded Unit Subscription Amount: $_________________ 

Pre-Funded Units: _________________ 

EIN Number: ____________________ 
 ☐ Notwithstanding
anything contained in this Agreement to the contrary, by checking this box (i) the obligations of the above-signed to purchase the securities set forth in this Agreement to be purchased from the Company by the above-signed, and the obligations
of the Company to sell such securities to the above-signed, shall be unconditional and all conditions to Closing shall be disregarded, (ii) the Closing shall occur on the second (2nd) Trading
Day following the date of this Agreement and (iii) any condition to Closing contemplated by this Agreement (but prior to being disregarded by clause (i) above) that required delivery by the Company or the above-signed of any agreement,
instrument, certificate or the like or purchase price (as applicable) shall no longer be a condition and shall instead be an unconditional obligation of the Company or the above-signed (as applicable) to deliver such agreement, instrument,
certificate or the like or purchase price (as applicable) to such other party on the Closing Date. 
 [SIGNATURE PAGES CONTINUE] 

  
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 Exhibit A 

Form of Pre-Funded Warrant 

  
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 Exhibit B 

Form of Warrant 

  
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