Exhibit 1.1

EXECUTION VERSION

1,538,462 Shares

Vicor Corporation

Common Stock

UNDERWRITING AGREEMENT

June 10, 2020

NEEDHAM & COMPANY, LLC

  As Representative of the several Underwriters

  c/o Needham & Company, LLC

  250 Park Avenue

  New York, New York 10177

Ladies and Gentlemen:

Vicor Corporation, a Delaware corporation (the “Company”), proposes to issue and sell 1,538,462 shares (the “Firm Shares”) of the Company’s common stock, $0.01 par value per share, to you and to the several other Underwriters named in Schedule I hereto (collectively, the “Underwriters”), for whom you are acting as representative (the “Representative”). The Company has also agreed to grant to you and the other Underwriters an option (the “Option”) to purchase up to an additional 230,769 shares of common stock of the Company, on the terms and for the purposes set forth in Section 1(b) (the “Option Shares”). The Firm Shares and the Option Shares are referred to collectively herein as the “Shares.” The shares of common stock and Class B common stock, each $0.01 par value per share, of the Company are hereinafter referred to as the “Common Stock.”

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

1.    Agreement to Sell and Purchase.

(a)    On the basis of the representations, warranties and agreements of the Company herein contained and subject to all the terms and conditions of this Underwriting Agreement (the “Agreement”), (i) the Company agrees to issue and sell the Firm Shares to the several Underwriters and (ii) each of the Underwriters, severally and not jointly, agrees to purchase from the Company the respective number of Firm Shares set forth opposite that Underwriter’s name in Schedule I hereto, at the purchase price of $62.2375 for each Firm Share.

(b)    Subject to all the terms and conditions of this Agreement, the Company grants the Option to the several Underwriters to purchase, severally and not jointly, up to 230,769 Option Shares at the same price per share as the Underwriters shall pay for the Firm Shares. The Option may be exercised in whole or in part at any time on or before the 30th day after the date of this Agreement upon written or telegraphic notice (an “Option Shares Notice”) by the Representative to the Company no later than 12:00 noon, New York City time, at least two and no more than five business days before the date specified for closing in the Option Shares Notice (an “Option Closing Date”), setting forth the aggregate number of Option Shares to be purchased and the time and date for such purchase. On an Option Closing Date, the Company will issue

and sell to the Underwriters the number of Option Shares set forth in the applicable Option Shares Notice, and each Underwriter will purchase such percentage of the Option Shares as is equal to the percentage of Firm Shares that such Underwriter is purchasing, as adjusted by the Representative in such manner as they deem advisable to avoid fractional shares.

2.    Delivery and Payment. Delivery of the Firm Shares shall be made to or as instructed by the Representative for the accounts of the several Underwriters in a form reasonably acceptable to the Representative against payment by the Underwriters of the purchase price by wire transfer payable in same-day funds to the order of the Company at the office of Needham & Company, LLC, 250 Park Avenue, New York, New York 10177, at 10:00 a.m., New York City time, on the second (or, if the purchase price set forth in Section 1(a) hereof is determined after 4:30 p.m., New York City time, the third) business day after the date of this Agreement, or at such time on such other date, not later than seven business days after the date of this Agreement, as may be agreed upon by the Company and the Representative (such date is hereinafter referred to as the “Closing Date”).

To the extent the Option is exercised, delivery of the Option Shares against payment by the Underwriters (in the manner specified above) will take place at the offices specified above for the Closing Date at the time and date (which may be the Closing Date) specified in the applicable Option Shares Notice.

The Shares shall be in definitive form and shall be registered in such names and in such denominations as the Representative shall request at least two business days prior to the Closing Date or the applicable Option Closing Date, as the case may be, by written notice to the Company and shall be delivered by or on behalf of the Company as instructed by the Representative through the facilities of The Depository Trust Company (“DTC”). The Company agrees to make certificates, if any, representing the Shares or evidence of their issuance available for inspection at least 24 hours prior to the Closing Date or the applicable Option Closing Date, as the case may be. If the Representative so elects, delivery of the Shares may be made by credit through full FAST transfer to the accounts at DTC designated by the Representative.

The cost of original issue tax stamps and other transfer taxes, if any, in connection with the issuance and delivery of the Firm Shares and Option Shares by the Company to the respective Underwriters shall be borne by the Company. The Company will pay and save each Underwriter and any subsequent holder of the Shares harmless from any and all liabilities with respect to or resulting from any failure or delay in paying federal and state stamp and other transfer taxes, if any, which may be payable or determined to be payable in connection with the original issuance or sale to such Underwriter of the Shares.

3.    Representations and Warranties of the Company.

The Company represents, warrants and covenants to each Underwriter that:

(a)     The Company meets the requirements for the use of Form S-3ASR, a registration statement (Registration No. 333-239041) on Form S-3ASR relating to the Shares, including a base prospectus relating to the Shares (the “Base Prospectus”) and such amendments thereto as may have been required to the date of this Agreement, has been prepared by the Company under the provisions of the Securities Act of 1933, as amended (the “Act”), and the rules and regulations (collectively referred to as the “Rules and Regulations”) of the Securities and Exchange Commission (the “Commission”) thereunder, has been filed with the Commission, and has been declared effective by the Commission, and the offering of the Shares complies with Rule 415 under the Act. A final prospectus supplement to the Base Prospectus relating to the Shares and the offering thereof will be filed promptly by the Company with the Commission in accordance with Rule 424(b) of the Rules and Regulations (such final prospectus supplement, as so filed, the “Prospectus Supplement”). Such registration statement at any given time, including the amendments

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thereto to such time, the exhibits and any schedules thereto at such time, the documents otherwise deemed to be a part thereof or included therein by the Rules and Regulations (including Rule 430B thereof), and any registration statement relating to the offering contemplated by this Agreement and filed pursuant to Rule 462(b) of the Rules and Regulations (“Rule 462(b)”), is herein called the “Registration Statement.” The term “Preliminary Prospectus” means any preliminary prospectus (including any preliminary prospectus supplement) relating to the Shares and the offering thereof as first filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations (“Rule 424(b)”). The term “Prospectus” means the Base Prospectus together with the Prospectus Supplement, except that if such Base Prospectus is amended or supplemented on or prior to the date on which the Prospectus Supplement was first filed pursuant to Rule 424(b), the term “Prospectus” shall mean the Base Prospectus as so amended or supplemented and as supplemented by the Prospectus Supplement. Any reference herein to the Registration Statement, the Base Prospectus, a Preliminary Prospectus, the Prospectus Supplement, or the Prospectus shall be deemed to refer to and include the documents incorporated by reference therein, and any reference herein to the terms “amend,” “amendment” or “supplement” with respect to the Registration Statement, the Base Prospectus, a Preliminary Prospectus, the Prospectus Supplement, or the Prospectus shall be deemed to refer to and include the filing of any document under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), after the time the Registration Statement initially became effective (the “Effective Date”), the date of the Base Prospectus, any Preliminary Prospectus, the Prospectus Supplement, or the Prospectus, as the case may be, and deemed to be incorporated therein by reference. The term “Issuer Free Writing Prospectus” means any “issuer free writing prospectus,” as defined in Rule 433 of the Rules and Regulations (“Rule 433”), relating to the Shares in the form filed or required to be filed with the Commission or, if not required to be filed, in the form retained in the Company’s records pursuant to Rule 433(g).

(b)     No order preventing or suspending the use of the Base Prospectus, any Preliminary Prospectus, the Prospectus Supplement, the Prospectus or any Issuer Free Writing Prospectus has been issued by the Commission, and no stop order suspending the effectiveness of the Registration Statement (including any related registration statement filed pursuant to Rule 462(b)) or any post-effective amendment thereto has been issued, and no proceeding for that purpose has been initiated or threatened by the Commission. On the Effective Date, on the date the Base Prospectus, any Preliminary Prospectus, the Prospectus Supplement, or the Prospectus is first filed with the Commission pursuant to Rule 424(b) (if required), at all times during the period through and including the Closing Date and, if later, the applicable Option Closing Date and when any post-effective amendment to the Registration Statement becomes effective or any amendment or supplement to the Prospectus is filed with the Commission, the Registration Statement and the Prospectus (as amended or as supplemented if the Company shall have filed with the Commission any amendment or supplement thereto), including the financial statements included or incorporated by reference in the Prospectus, did and will comply in all material respects with all applicable provisions of the Act, the Exchange Act, the rules and regulations of the Commission under the Exchange Act (the “Exchange Act Rules and Regulations”), and the Rules and Regulations and will contain all statements required to be stated therein in accordance with the Act, the Exchange Act, the Exchange Act Rules and Regulations, and the Rules and Regulations. As of the applicable effective date as to each part of the Registration Statement, no part of the Registration Statement, the Prospectus or any such amendment or supplement thereto did or will contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein not misleading. At the Effective Date, the date the Base Prospectus or any amendment or supplement to the Base Prospectus, including any Preliminary Prospectus or the Prospectus Supplement, is filed with the Commission, the date of first use of any Preliminary Prospectus or the Prospectus Supplement, and at the Closing Date and, if later, the applicable Option Closing Date, the Prospectus did not and will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

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As of the Applicable Time, neither (x) the Issuer General Use Free Writing Prospectus(es) (as defined below) issued at or prior to the Applicable Time (as defined below), the Pricing Prospectus (as defined below) and the documents and information listed on Schedule II hereto, all considered together (collectively, the “General Disclosure Package”), nor (y) any individual Issuer Limited Use Free Writing Prospectus, when considered together with the General Disclosure Package, included any untrue statement of a material fact or omitted to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

As used in this subsection and elsewhere in this Agreement:

“Applicable Time” means 5:30 p.m. (Eastern time) on June 10, 2020 or such other time as agreed by the Company and Needham & Company, LLC.

“Issuer General Use Free Writing Prospectus” means any Issuer Free Writing Prospectus that is intended for general distribution to prospective investors, as evidenced by its being specified in Schedule II hereto.

“Issuer Limited Use Free Writing Prospectus” means any Issuer Free Writing Prospectus that is not an Issuer General Use Free Writing Prospectus.

“Pricing Prospectus” means the Base Prospectus, as amended or supplemented immediately prior to the Applicable Time, including any document incorporated by reference therein and any Prospectus Supplement deemed to be a part thereof. For purposes of this definition, information contained in a form of prospectus that is deemed retroactively to be a part of the Registration Statement pursuant to Rule 430B shall be considered to be included in the Pricing Prospectus only if the actual time that form of prospectus is filed with the Commission pursuant to Rule 424(b) is prior to the Applicable Time.

Each Issuer Free Writing Prospectus, as of its issue date and at all subsequent times through the completion of the public offer and sale of the Shares or until any earlier date that the issuer notified or notifies the Representative as described in the next sentence, did not, does not and will not include any information that conflicted, conflicts or will conflict with the information contained in the Registration Statement or the Prospectus, including any document incorporated by reference therein that has not been superseded or modified. If there occurs an event or development as a result of which the General Disclosure Package would include an untrue statement of a material fact or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances then prevailing, not misleading, the Company will promptly notify the Representative so that any use of the General Disclosure Package may cease until it is amended or supplemented to correct such untrue statement or omission.

The foregoing representations and warranties in this Section 3(b) do not apply to any statements or omissions made in reliance on and in conformity with information relating to any Underwriter furnished in writing to the Company by the Representative specifically for inclusion in the Registration Statement, the Prospectus Supplement, the Pricing Prospectus, the Prospectus or any Issuer Free Writing Prospectus or any amendment or supplement thereto. The Company acknowledges that the statements set forth in the fourth, fifth and twelfth through sixteenth paragraphs under the heading “Underwriting” in the Pricing Prospectus and the Prospectus constitute the only information relating to any Underwriter furnished in writing to the Company by the Representative specifically for inclusion in the Registration Statement, the Prospectus Supplement, the Pricing Prospectus, the Prospectus and any Issuer Free Writing Prospectus (the “Underwriter Information”).

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(c)     (i) At the earliest time after the filing of the Registration Statement that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) of the Rules and Regulations) of the Shares and (ii) as of the date hereof, the Company was not and is not an Ineligible Issuer (as defined in Rule 405 of the Rules and Regulations (“Rule 405”)), without taking account of any determination by the Commission pursuant to Rule 405 that it is not necessary that the Company be considered an Ineligible Issuer.

(d)     The documents that are incorporated by reference in the Base Prospectus, any Preliminary Prospectus, the Pricing Prospectus and the Prospectus or from which information is so incorporated by reference, when they became or become effective or were or are filed with the Commission, as the case may be, complied or will comply in all material respects with the requirements of the Act or the Exchange Act, as applicable, and the Rules and Regulations or the Exchange Act Rules and Regulations, as applicable; and any documents so filed and incorporated by reference subsequent to the Effective Date shall, when they are filed with the Commission, comply in all material respects with the requirements of the Act or the Exchange Act, as applicable, and the Rules and Regulations or the Exchange Act Rules and Regulations, as applicable. No such documents were filed with the Commission since the Commission’s close of business on the business day immediately prior to the date of this Agreement and prior to the execution of this Agreement, except as set forth on Schedule II hereto.

(e)     The Company does not own, directly or indirectly, any shares of stock or any other equity or long-term debt securities of any corporation or have any equity interest in any corporation, firm, partnership, joint venture, association or other entity, other than the subsidiaries listed in Exhibit 21.1 to the Registration Statement (the “Subsidiaries”). The Company and each of its Subsidiaries is a entity duly organized, validly existing and in good standing under the laws of its jurisdiction of incorporation. The Company and each of its Subsidiaries has full power and authority to conduct all the activities conducted by it, to own or lease all the assets owned or leased by it and to conduct its business as described in the Registration Statement, the Pricing Prospectus and the Prospectus and is duly licensed or qualified to do business and in good standing as a foreign corporation or such other entity in all jurisdictions in which the nature of the activities conducted by it or the character of the assets owned or leased by it makes such license or qualification necessary, except to the extent that the failure to be so qualified or be in good standing would not materially and adversely affect the Company and its Subsidiaries, taken as a whole, or their respective businesses, properties, business prospects, conditions (financial or other) or results of operations, taken as a whole (such effect is referred to herein as a “Material Adverse Effect”). All of the outstanding shares of capital stock of each Subsidiary have been duly authorized and validly issued and are fully paid and nonassessable, and owned by the Company free and clear of all claims, liens, charges and encumbrances; there are no securities outstanding that are convertible into or exercisable or exchangeable for capital stock of any Subsidiary.

(f)     All of the outstanding shares of capital stock of the Company have been duly authorized, validly issued and are fully paid and nonassessable and were issued in compliance with all applicable state and federal securities laws; the Firm Shares and the Option Shares have been duly authorized and when issued and paid for as contemplated herein will be validly issued, fully paid and nonassessable; no preemptive or similar rights exist with respect to any of the Shares or the issue and sale thereof. The description of the capital stock of the Company incorporated by reference in the Registration Statement, the Pricing Prospectus and the Prospectus is complete and accurate in all material respects. Except as set forth in the Pricing Prospectus and the Prospectus, the Company does not have outstanding and, at the Closing Date and, if later, the applicable Option Closing Date, will not have outstanding, any options to purchase, or any rights or warrants to subscribe for, or any other securities or obligations convertible into, or any other contracts or commitments to issue or sell, any shares of capital stock, or any such warrants, convertible securities or obligations. No further approval or authority of stockholders or the Board of Directors of the Company will be required for the issuance and sale of the Shares as contemplated herein. The certificates evidencing the Shares, if any, are in due and proper legal form and have been duly authorized for issuance by the Company.

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(g)     The financial statements and schedules incorporated by reference in the Registration Statement, the Pricing Prospectus or the Prospectus present fairly in all material respects the financial condition of the Company and its consolidated Subsidiaries as of the respective dates thereof and the results of operations and cash flows of the Company and its consolidated Subsidiaries for the respective periods covered thereby, all in conformity with generally accepted accounting principles applied on a consistent basis throughout the entire period involved, except as otherwise disclosed in the Pricing Prospectus or the Prospectus. No other financial statements or schedules of the Company are required by the Act, the Exchange Act, the Exchange Act Rules and Regulations or the Rules and Regulations to be included in the Registration Statement, the Pricing Prospectus or the Prospectus. KPMG LLP (the “Accountants”), who have reported on such financial statements and schedules, are independent accountants with respect to the Company as required by the Act and the Rules and Regulations and Rule 3500 of the Public Company Accounting Oversight Board (“PCAOB”).

(h)     Subsequent to the respective dates as of which information is given in the Registration Statement, the Pricing Prospectus and the Prospectus and prior to or on the Closing Date and, if later, the applicable Option Closing Date, except as set forth in or contemplated by the Registration Statement, the Pricing Prospectus and the Prospectus, (i) there has not been and will not have been any change in the capitalization of the Company (other than in connection with the exercise of options to purchase the Common Stock granted pursuant to the Company’s stock option plans from the shares reserved therefor as described in the Registration Statement, the Pricing Prospectus and the Prospectus, the exercise of warrants described in the Registration Statement, the Pricing Prospectus and the Prospectus, and the grant of stock options consistent with the past practice of the Company), or any Material Adverse Effect arising for any reason whatsoever, (ii) neither the Company nor any of its Subsidiaries has incurred nor will any of them incur, except in the ordinary course of business as described in the Pricing Prospectus and the Prospectus, any material liabilities or obligations, direct or contingent, nor has the Company or any of its Subsidiaries entered into nor will any of them enter into, except in the ordinary course of business as described in the Pricing Prospectus and the Prospectus, any material transactions other than pursuant to this Agreement and the transactions referred to herein and (iii) the Company has not and will not have paid or declared any dividends or other distributions of any kind on any class of its capital stock.

(i)     The Company is not, will not become as a result of the transactions contemplated hereby, and will not conduct its business in a manner that would cause it to become, an “investment company” or required to be registered as an “investment company,” as such terms are defined in the Investment Company Act of 1940, as amended.

(j)     Except as set forth in the Registration Statement, the Pricing Prospectus and the Prospectus, there are no actions, suits or proceedings pending or, to the knowledge of the Company, threatened against or affecting the Company, or any of its Subsidiaries or any of its or their officers in their capacity as such, nor any basis therefor, before or by any federal or state court, commission, regulatory body, administrative agency or other governmental body, domestic or foreign, wherein an unfavorable ruling, decision or finding might have a Material Adverse Effect.

(k)     The Company and each Subsidiary has, and at the Closing Date and, if later, the applicable Option Closing Date, will have, performed all the obligations required to be performed by it, and is not, and at the Closing Date, and, if later, the applicable Option Closing Date, will not be, in default, under any contract or other instrument to which it is a party or by which its property is bound or affected, which default might reasonably be expected to have a Material Adverse Effect. To the knowledge of the Company, no other party under any contract or other instrument to which it or any of its Subsidiaries is a

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party is in default in any respect thereunder, which default might reasonably be expected to have a Material Adverse Effect. Neither the Company nor any of its Subsidiaries is, and at the Closing Date and, if later, the applicable Option Closing Date, will be, in violation of any provision of its certificate or articles of incorporation or by-laws or other organizational documents.

(l)     No consent, approval, authorization or order of, or any filing or declaration with, any court or governmental agency or body is required for the consummation by the Company of the transactions on its part contemplated herein, except such as have been obtained under the Act or the Rules and Regulations and such as may be required under state securities or Blue Sky laws or the by-laws and rules of the Financial Industry Regulatory Authority, Inc. (“FINRA”) in connection with the purchase and distribution by the Underwriters of the Shares.

(m)     The Company has full corporate power and authority to enter into this Agreement. This Agreement has been duly authorized, executed and delivered by the Company and constitutes a valid and binding agreement of the Company, enforceable against the Company in accordance with the terms hereof. The performance of this Agreement and the consummation of the transactions contemplated hereby will not result in the creation or imposition of any lien, charge or encumbrance upon any of the assets of the Company or any of its Subsidiaries pursuant to the terms or provisions of, or result in a breach or violation of any of the terms or provisions of, or conflict with or constitute a default under, or give any party a right to terminate any of its obligations under, or result in the acceleration of any obligation under, (i) the certificate or articles of incorporation or by-laws or other organizational documents of the Company or any of its Subsidiaries, (ii) any indenture, mortgage, deed of trust, voting trust agreement, loan agreement, bond, debenture, note agreement or other evidence of indebtedness, lease, contract or other agreement or instrument to which the Company or any of its Subsidiaries is a party or by which the Company, any of its Subsidiaries or any of its or their properties is bound or affected, or (iii) violate or conflict with any judgment, ruling, decree, order, statute, rule or regulation of any court or other governmental agency or body applicable to the business or properties of the Company or any of its Subsidiaries, except in the case of clauses (i) and (ii) as would not result in a Material Adverse Effect.

(n)     The Company and its Subsidiaries have good and marketable title to all properties and assets described in the Pricing Prospectus and the Prospectus as owned by them, free and clear of all liens, charges, encumbrances or restrictions, except such as are described in the Pricing Prospectus and the Prospectus or are not material to the business of the Company or its Subsidiaries. The Company and its Subsidiaries have valid, subsisting and enforceable leases for the properties described in the Pricing Prospectus and the Prospectus as leased by them. The Company and its Subsidiaries own or lease all such properties as are necessary to their operations as now conducted or as proposed to be conducted, except where the failure to so own or lease would not have a Material Adverse Effect.

(o)     The Company has not distributed and will not distribute prior to the later of (i) the Closing Date or, if later, the applicable Option Closing Date, and (ii) completion of the distribution of the Shares, any offering material in connection with the offering and sale of the Shares other than any Preliminary Prospectus, the Prospectus, the Registration Statement, any Issuer Free Writing Prospectus listed in Schedule II hereto, and other materials, if any, permitted by the Act and the Rules and Regulations. Neither the Company nor any of its directors, officers or controlling persons has taken, directly or indirectly, any action designed, or that might reasonably be expected to cause or result, under the Act or otherwise, in, or that has constituted, stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Shares.

(p)     No holder of securities of the Company has rights to the registration of any securities of the Company because of the filing of the Registration Statement, which rights have not been waived by the holder thereof as of the date hereof.

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(q)     The Common Stock is registered under Section 12(b) of the Exchange Act and the Company has filed an application to list the Shares on The NASDAQ Global Select Market (“Nasdaq”). There is no action pending by the Company or, to the Company’s knowledge, by Nasdaq to delist the Common Stock from Nasdaq, nor has the Company received any notification that Nasdaq is currently contemplating terminating such listing.

(r)     Except as disclosed in or specifically contemplated by the Pricing Prospectus and the Prospectus (i) to the Company’s knowledge, the Company and each of its Subsidiaries owns or has adequate rights to use all trademarks, trade names, domain names, patents, patent rights, mask works, copyrights, technology, know-how (including trade secrets and other unpatented or unpatentable proprietary or confidential information, systems or procedures), service marks, trade dress rights, and other intellectual property and registrations and applications for registration for any of the foregoing (collectively, “Intellectual Property”) and has such other licenses, approvals and governmental authorizations, in each case, sufficient to conduct its business as now conducted and as now proposed to be conducted, and, to the Company’s and its Subsidiaries’ knowledge, none of the foregoing Intellectual Property rights owned or licensed by the Company or any of its Subsidiaries is invalid or unenforceable, (ii) the Company has no knowledge of any infringement by it or any of its Subsidiaries of Intellectual Property rights of others, where such infringement could have a Material Adverse Effect, (iii) the Company is not aware of any infringement, misappropriation or violation by others of, or conflict by others with rights of the Company or any of its Subsidiaries with respect to, any Intellectual Property, (iv) there is no claim being made against the Company or any of its Subsidiaries or, to the knowledge of the Company and its Subsidiaries, any employee of the Company or any of its Subsidiaries, regarding Intellectual Property or other infringement that could have a Material Adverse Effect, and (v) the Company and its Subsidiaries have not received any notice of infringement with respect to any patent or any notice challenging the validity, scope or enforceability of any Intellectual Property owned by or licensed to the Company or any of its Subsidiaries, in each case the loss of which patent or Intellectual Property (or loss of rights thereto) would have a Material Adverse Effect.

(s)     To the knowledge of the Company, none of the Intellectual Property or technology (including information technology and outsourced arrangements) employed by the Company or the Subsidiaries has been obtained or is being used by the Company or the Subsidiaries in violation of any contractual obligation binding on the Company or any of the Subsidiaries or any of their respective officers, directors or employees. The Company and the Subsidiaries own or have a valid right to access and use all computer systems, networks, hardware, software, databases, websites, and equipment used to process, store, maintain and operate data, information, and functions used in connection with the business of the Company and the Subsidiaries (the “Company IT Systems”). The Company IT Systems are adequate for, and operate and perform in all material respects as required in connection with, the operation of the business of the Company and the Subsidiaries as currently conducted, except as would not have a Material Adverse Effect.

(t)     The Company and each of its Subsidiaries has filed all federal, state, local and foreign income tax returns that have been required to be filed and has paid all material taxes and assessments received by it to the extent that such taxes or assessments have become due. Neither the Company nor any of its Subsidiaries has any tax deficiency that has been or, to the knowledge of the Company, might be asserted or threatened against it that would have a Material Adverse Effect.

(u)     The Company or its Subsidiaries own or possess all authorizations, approvals, orders, licenses, registrations, other certificates and permits of and from all governmental regulatory officials and bodies, necessary to conduct their respective businesses as contemplated in the Pricing Prospectus and the Prospectus, except where the failure to own or possess all such authorizations, approvals, orders, licenses, registrations, other certificates and permits would not have a Material Adverse Effect. There is no proceeding pending or threatened (or any basis therefor known to the Company) that may cause any such authorization, approval, order, license, registration, certificate or permit to be revoked, withdrawn,

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cancelled, suspended or not renewed; and the Company and each of its Subsidiaries is conducting its business in compliance with all laws, rules and regulations applicable thereto (including, without limitation, all applicable federal, state and local environmental laws and regulations) except where such noncompliance would not have a Material Adverse Effect.

(v)     The Company and each of its Subsidiaries maintains insurance of the types and in the amounts generally deemed adequate for its business, including, but not limited to, insurance covering real and personal property owned or leased by the Company and its Subsidiaries against theft, damage, destruction, acts of vandalism and all other risks customarily insured against, all of which insurance is in full force and effect.

(w)     Other than as contemplated by this Agreement, the Company has not incurred and will not incur any liability for any finder’s or broker’s fee or agent’s commission in connection with the execution and delivery of this Agreement or the consummation of the transactions contemplated hereby.

(x)     The Company is in material compliance with all applicable provisions of the Sarbanes-Oxley Act and the rules and regulations of the Commission thereunder.

(y)     Neither the Company nor any of its Subsidiaries nor, to the best of the Company’s knowledge, any director, officer, agent, employee or other person associated with or acting on behalf of the Company or any of its Subsidiaries has, directly or indirectly, (i) used any corporate funds for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity, (ii) made any unlawful payment from corporate funds to any foreign or domestic government official or employee or foreign or domestic political party or campaign, (iii) violated any provision of the Foreign Corrupt Practices Act of 1977, as amended, or (iv) made any bribe, illegal rebate, payoff, influence payment, kickback or other unlawful payment.

(z)     The books, records and accounts of the Company and its Subsidiaries accurately and fairly reflect, in reasonable detail, the transactions in, and dispositions of, the assets of, and the results of operations of, the Company and its Subsidiaries. The Company and each of its Subsidiaries maintains a system of internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorization, (ii) transactions are recorded as necessary to permit preparation of the Company’s consolidated financial statements in accordance with generally accepted accounting principles and to maintain asset accountability, (iii) access to assets is permitted only in accordance with management’s general or specific 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’s internal control over financial reporting is effective and the Company is not aware of any material weaknesses in its internal control over financial reporting. Since the date of the latest audited financial statements included or incorporated by reference in the Pricing Prospectus and the Prospectus, there has been no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

(aa)     The Company maintains disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act); such disclosure controls and procedures have been designed to ensure, at a reasonable assurance level, that material information relating to the Company and its Subsidiaries is made known to the Company’s principal executive officer and principal financial officer by others within those entities; and such disclosure controls and procedures are effective.

(bb)     There are no affiliations or associations between any member of FINRA and any of the Company’s officers, directors, or 5% or greater securityholders.

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(cc)     Neither the Company nor any of its Subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its Subsidiaries is an individual or entity that is, or is owned or controlled by an individual or entity that is (i) currently subject to any U.S. sanctions administered or enforced by the Office of Foreign Assets Control of the U.S. Treasury Department OFAC., the United Nations Security Council, the European Union, Her Majesty’s Treasury or other relevant sanctions authority (“Sanctions”), nor (ii) located, organized or resident in a country or territory that is the subject of Sanctions (including, without limitation, Burma/Myanmar, Cuba, Iran, Libya, North Korea, Sudan and Syria). For the past five years, the Company and its Subsidiaries have not knowingly engaged in, and are not now knowingly engaged in, any dealings or transactions with any individual or entity, or in any country or territory, that at the time of the dealing or transaction is or was the subject of Sanctions, and have instituted and maintain policies and procedures designed to promote and achieve compliance with such Sanctions.

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

(ee)     Except as would not, individually or in the aggregate, have a Material Adverse Effect, (i) each of the Company and each of its Subsidiaries is in compliance with all applicable rules, laws and regulation relating to pollution, the protection of health or the environment, and the use, transportation, treatment, storage and disposal of, or exposure to, hazardous or toxic substances or wastes, (“Environmental Law”), (ii) none of the Company nor any of its Subsidiaries has received any written notice from any governmental authority or third party, or otherwise has knowledge, of an asserted claim under Environmental Laws, and (iii) to the knowledge of the Company, no facts currently exist that are reasonably likely to subject the Company or any of its Subsidiaries to liability under Environmental Laws, including any liability for remediation of any releases or threatened releases of hazardous or toxic substances.

(ff)     The statistical, industry-related and market-related data included or incorporated by reference in the Registration Statement, the Pricing Prospectus and the Prospectus are based on or derived from sources the Company reasonably and in good faith believes are reliable and accurate, and such data agrees with the sources from which they are derived.

(gg)     The Company and each of its Subsidiaries is in compliance in all material respects with all presently applicable provisions of the Employee Retirement Income Security Act of 1974, as amended, including the regulations and published interpretations thereunder (“ERISA”); no “reportable event” (as defined in ERISA) has occurred with respect to any “pension plan” (as defined in ERISA) for which the Company and each of its Subsidiaries would have any liability; each of the Company and each of its Subsidiaries has not incurred and does not expect to incur liability under (i) Title IV of ERISA with respect to termination of, or withdrawal from, any “pension plan” or (ii) Sections 412 or 4971 of the Internal Revenue Code of 1986, as amended, including the regulations and published interpretations thereunder (the “Code”); and each “pension plan” for which the Company or any Subsidiary would have any liability that is intended to be qualified under Section 401(a) of the Code is so qualified in all material respects and nothing has occurred, whether by action or by failure to act, which would cause the loss of such qualification.

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(hh)     No material labor dispute with the employees of the Company or any of its Subsidiaries exists or, to the knowledge of the Company, is imminent; and the Company is not aware of any existing, threatened or imminent labor disturbance by the employees of any of its principal suppliers, manufacturers or contractors that would have a Material Adverse Effect.

(ii)     No Subsidiary is currently prohibited, directly or indirectly, from paying any dividends to the Company, from making any other distribution on such Subsidiary’s capital stock, from repaying to the Company any loans or advances to such Subsidiary from the Company or from transferring any of such Subsidiary’s property or assets to the Company or any other Subsidiary of the Company, except as described in or contemplated by the Pricing Prospectus and the Prospectus.

(jj)     The Company and its Subsidiaries have operated its business in a manner compliant in all material respects with all privacy and data protection laws and regulations applicable to the Company’s and its Subsidiaries’ collection, handling, and storage of its customers’ data. The Company and its Subsidiaries have policies and procedures in place designed to ensure the integrity and security of the data collected, handled or stored in connection with the delivery of its product offerings. The Company and its Subsidiaries comply with, have policies and procedures in place designed to ensure privacy and data protection laws are complied with and takes appropriate steps which are reasonably designed to assure compliance in all material respects with such policies and procedures.

(kk)     No statement, representation, warranty or covenant made by the Company in this Agreement or made in any certificate or document required by Section 5 of this Agreement to be delivered to the Representative was or will be, when made, inaccurate, untrue or incorrect.

4.    Agreements of the Company.

The Company covenants and agrees with the several Underwriters as follows:

(a)     The Company will not, either prior to the Applicable Time or thereafter during such period as the Prospectus is required by law to be delivered in connection with sales of the Shares by an Underwriter or a dealer, file any amendment or supplement to the Registration Statement, the Base Prospectus or the Prospectus, unless a copy thereof shall first have been submitted to the Representative within a reasonable period of time prior to the filing thereof and the Representative shall not have objected thereto in good faith.

(b)     Prior to the completion of the distribution of the Share by the Underwriters, the Company will notify the Representative promptly, and will confirm such advice in writing, (i) when any amendment to the Registration Statement has been filed or becomes effective or any amendment or supplement to the Prospectus has been filed, (ii) of any request by the Commission for amendments or supplements to the Registration Statement or the Prospectus or for additional information, (iii) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or preventing or suspending the use of the Base Prospectus, any Preliminary Prospectus, the Prospectus Supplement, the Prospectus or any Issuer Free Writing Prospectus or the initiation of any proceedings for that purpose or the threat thereof, (iv) of the happening of any event during the period mentioned in the third sentence of Section 4(e) that in the judgment of the Company makes any statement made in the Registration Statement or the Prospectus untrue or that requires the making of any changes in the Registration Statement or the Prospectus in order to make the statements therein, in the light of the circumstances in which they are made, not misleading, and (v) of receipt by the Company or any representative or attorney of the Company of any other communication from the Commission relating to the Company, the Registration Statement, any Preliminary Prospectus, the Base Prospectus, the Prospectus Supplement or the Prospectus. If at any time the Commission shall issue any order suspending the effectiveness of the Registration Statement or preventing or suspending the use of the Base Prospectus, any Preliminary Prospectus, the Prospectus

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Supplement, the Prospectus or any Issuer Free Writing Prospectus, the Company will make every reasonable effort to obtain the withdrawal of such order at the earliest possible moment. If the Company has omitted any information from the Registration Statement pursuant to Rule 430B of the Rules and Regulations, the Company will comply with the provisions of and make all requisite filings with the Commission pursuant to said Rule 430B and notify the Representative promptly of all such filings. If the Company elects to rely upon Rule 462(b) under the Act, the Company shall file a registration statement under Rule 462(b) with the Commission in compliance with Rule 462(b) by 10:00 p.m., Washington, D.C. time, on the date of this Agreement, and the Company shall at the time of filing either pay to the Commission the filing fee for such Rule 462(b) registration statement or give irrevocable instructions for the payment of such fee pursuant to the Rules and Regulations.

(c)     The Company will furnish to each Representative, without charge, an electronic copy of each of the Registration Statement and of any pre- or post-effective amendment thereto, including financial statements and schedules, and all exhibits thereto and will furnish to the Representative, without charge, for transmittal to each of the other Underwriters, a copy of the Registration Statement and any pre- or post-effective amendment thereto, including financial statements and schedules but without exhibits.

(d)     The Company will comply with all the provisions of any undertakings contained in the Registration Statement.

(e)     So long as delivery of a prospectus by an Underwriter or dealer may be required by the Act (including in circumstances where such requirement may be satisfied pursuant to Rule 172 of the Rules and Regulations), the Company will deliver to each of the Underwriters, without charge, as many written and electronic copies of each Preliminary Prospectus, the Base Prospectus, the Prospectus Supplement, the Prospectus, each Issuer Free Writing Prospectus or any amendment or supplement thereto as the Representative may reasonably request. The Company consents to the use of each Preliminary Prospectus, the Base Prospectus, the Prospectus Supplement, the Prospectus, each Issuer Free Writing Prospectus and any amendment or supplement thereto by the Underwriters and by all dealers to whom the Shares may be sold, both in connection with the offering or sale of the Shares and for any period of time thereafter during which the Prospectus is required by law to be delivered in connection therewith. If during such period of time any event shall occur that in the judgment of the Company or counsel to the Underwriters should be set forth in the Prospectus in order to make any statement therein, in the light of the circumstances under which it was made, not misleading, or if it is necessary to supplement or amend the Prospectus to comply with law, the Company will forthwith prepare and duly file with the Commission an appropriate supplement or amendment thereto, and will deliver to each of the Underwriters, without charge, such number of copies of such supplement or amendment to the Prospectus as the Representative may reasonably request. The Company will not file any document under the Exchange Act or the Exchange Act Rules and Regulations before the termination of the offering of the Shares by the Underwriters, if such document would be deemed to be incorporated by reference into the Prospectus, that is not approved by the Representative after reasonable notice thereof. If at any time following issuance of an Issuer Free Writing Prospectus there occurred or occurs an event or development as a result of which such Issuer Free Writing Prospectus conflicted or would conflict with the information contained in the Registration Statement, the Pricing Prospectus or the Prospectus or included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at that subsequent time, not misleading, the Company will promptly notify the Representative and, if requested by the Representative, will promptly amend or supplement, at its own expense, such Issuer Free Writing Prospectus to eliminate or correct such conflict, untrue statement or omission.

(f)     Prior to any public offering of the Shares, the Company will cooperate with the Representative and counsel to the Underwriters in connection with the registration or qualification of the Shares for offer

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and sale under the state or foreign securities or Blue Sky laws of such jurisdictions as the Representative may request; provided, that in no event shall the Company be obligated to qualify to do business in any jurisdiction where it is not now so qualified or to take any action that would subject it to general service of process in any jurisdiction where it is not now so subject.

(g)     The Company will, so long as required under the Rules and Regulations, furnish to its stockholders as soon as practicable after the end of each fiscal year an annual report (including a balance sheet and statements of income, stockholders’ equity and cash flow of the Company and its consolidated Subsidiaries, if any, certified by independent public accountants) and, as soon as practicable after the end of each of the first three quarters of each fiscal year (beginning with the fiscal quarter ending after the effective date of the Registration Statement), consolidated summary financial information of the Company and its Subsidiaries, if any, for such quarter in reasonable detail.

(h)     The Company will make generally available to holders of its securities as soon as may be practicable, but in no event later than the Availability Date (as defined below), an earning statement (which need not be audited but shall be in reasonable detail) covering a period of 12 months commencing after the Effective Date that will satisfy the provisions of Section 11(a) of the Act (including Rule 158 of the Rules and Regulations). For the purpose of the preceding sentence, “Availability Date” means the 45th day after the end of the fourth fiscal quarter following the fiscal quarter that includes such Effective Date, except that if such fourth fiscal quarter is the last quarter of the Company’s fiscal year, “Availability Date” means the 90th day after the end of such fourth fiscal quarter.

(i)     Whether or not the transactions contemplated by this Agreement are consummated or this Agreement is terminated, the Company will pay or reimburse if paid by the Underwriters all costs and expenses incident to the performance of the obligations of the Company under this Agreement and in connection with the transactions contemplated hereby, including but not limited to costs and expenses of or relating to (i) the preparation, printing and filing of the Registration Statement and exhibits to it, each Preliminary Prospectus, the Base Prospectus, the Prospectus Supplement, the Pricing Prospectus, the Prospectus, any Issuer Free Writing Prospectus, and any amendment or supplement to any of the foregoing, (ii) the preparation and delivery of certificates representing the Shares, (iii) furnishing (including costs of shipping and mailing) such copies of the Registration Statement, any Preliminary Prospectus, the Base Prospectus, the Prospectus Supplement, the Prospectus, and any Issuer Free Writing Prospectus, and all amendments and supplements thereto, as may be requested for use in connection with the offering and sale of the Shares by the Underwriters or by dealers to whom Shares may be sold, (iv) the listing of the Shares on Nasdaq, (v) any filings required to be made in connection with clearance of the offering of the Shares with FINRA (including the fees, disbursements and other charges of counsel for the Underwriters in connection therewith), (vi) the registration or qualification of the Shares for offer and sale under the state or foreign securities or Blue Sky laws of such jurisdictions designated pursuant to Section 4(f) and the preparation, printing and distribution of any Blue Sky memoranda (including the fees, disbursements and other charges of counsel to the Underwriters in connection therewith), (vii) fees, disbursements and other charges of counsel to the Company and of the Accountants, (viii) the transfer agent for the Shares, (ix) “road show” presentations to prospective purchasers of the Shares (including any travel expenses of the Company’s officers, directors and employees in connection with attending or hosting meetings) , and (x) all other costs and expenses of the Underwriters incident to the performance of their obligations hereunder not otherwise specifically provided for herein, including the fees, disbursements and other charges of counsel to the Underwriters (in addition to those set forth in clauses (v) and (vi)); provided, however, that in no event under this clause (x) shall the Company be required to pay or reimburse if paid by the Underwriters any costs and expenses in excess of $25,000 in the aggregate.

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(j)     The Company will not at any time, directly or indirectly, take any action designed or that might reasonably be expected to cause or result in, or that will constitute, stabilization of the price of the shares of Common Stock to facilitate the sale or resale of any of the Shares.

(k)     The Company will apply the net proceeds from the offering and sale of the Shares to be sold by the Company in the manner set forth in the Pricing Prospectus and the Prospectus under “Use of Proceeds.”

(l)     During the period beginning from the date hereof and continuing to and including the date that is 90 days after the date of the Prospectus, without the prior written consent of the Representative, the Company will not (1) offer, sell, contract to sell, pledge, grant options, warrants or rights to purchase, or otherwise dispose of any equity securities of the Company or any other securities convertible into or exchangeable for its Common Stock or other equity security (other than pursuant to employee stock option plans disclosed in the Prospectus or pursuant to the conversion of convertible securities or the exercise of warrants in each case outstanding on the date of this Agreement) or (2) enter into any swap or other derivatives transaction that transfers to another, in whole or in part, any of the economic benefits or risks of ownership of shares of Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or other securities, in cash or otherwise.

(m)     The Company will cause each of its executive officers and directors to enter into lock-up agreements with the Representative to the effect that they will not, without the prior written consent of the Representative, sell, contract to sell or otherwise dispose of any shares of Common Stock or rights to acquire such shares according to the terms set forth in Schedule III hereto.

5.    Further Agreements.

(a)    The Company represents and agrees that, without the prior written consent of Needham & Company, LLC, and each Underwriter represents and agrees that, without the prior written consent of the Company and Needham & Company, LLC, it has not made and will not make any offer relating to the Shares that would constitute a “free writing prospectus” as defined in Rule 405 of the Rules and Regulations. Any such free writing prospectus the use of which has been consented to by the Company and Needham & Company, LLC is listed on Schedule II and herein called a “Permitted Free Writing Prospectus.”

(b)    The Company agrees that it has treated and will treat, as the case may be, each Permitted Free Writing Prospectus as an Issuer Free Writing Prospectus and that it has complied and will comply, as the case may be, with the requirements of Rules 164 and 433 of the Rules and Regulations applicable to any Permitted Free Writing Prospectus, including timely Commission filing where required, record keeping and legending.

6.    Conditions of the Obligations of the Underwriters.

The obligations of each Underwriter hereunder are subject to the following conditions:

(a)    All filings required by Rule 424 and Rule 430B of the Rules and Regulations shall have been made.

(b)    (i) No stop order suspending the effectiveness of the Registration Statement or preventing or suspending the use of the Base Prospectus, any Preliminary Prospectus, the Prospectus Supplement, the Prospectus or any Issuer Free Writing Prospectus shall have been issued and no proceedings for that purpose shall be pending or threatened by the Commission, (ii) no order suspending the effectiveness of the Registration Statement or the qualification or registration of the Shares under the securities or Blue Sky

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laws of any jurisdiction shall be in effect and no proceeding for such purpose shall be pending before or threatened or contemplated by the Commission or the authorities of any such jurisdiction, (iii) any request for additional information on the part of the staff of the Commission or any such authorities shall have been complied with to the satisfaction of the staff of the Commission or such authorities, (iv) after the date hereof no amendment or supplement to the Registration Statement, the Prospectus or the Pricing Prospectus shall have been filed unless a copy thereof was first submitted to the Representative and the Representative do not object thereto in good faith, and (v) the Representative shall have received certificates, dated the Closing Date and, if later, the applicable Option Closing Date and signed by the Chief Financial Officer of the Company (who may, as to proceedings threatened, rely upon the best of their information and belief), to the effect of clauses (i), (ii) and (iii) of this paragraph.

(c)    Since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, (i) there shall not have been a material adverse change in the general affairs, business, business prospects, properties, management, condition (financial or otherwise) or results of operations of the Company or any of its Subsidiaries, whether or not arising from transactions in the ordinary course of business, in each case other than as described in or contemplated by the Registration Statement and the Pricing Prospectus, and (ii) neither the Company nor any of its Subsidiaries shall have sustained any material loss or interference with its business or properties from fire, explosion, flood or other casualty, whether or not covered by insurance, or from any labor dispute or any court or legislative or other governmental action, order or decree, which is not described in the Registration Statement and the Pricing Prospectus, if in the judgment of the Representative any such development makes it impracticable or inadvisable to consummate the sale and delivery of the Shares by the Underwriters at the public offering price.

(d)    Since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, there shall have been no litigation or other proceeding instituted against the Company, any of its Subsidiaries, or any of its or their officers or directors in their capacities as such, before or by any federal, state or local court, commission, regulatory body, administrative agency or other governmental body, domestic or foreign, in which litigation or proceeding an unfavorable ruling, decision or finding would, in the judgment of the Representative, have a Material Adverse Effect or if, in the judgment of the Representative, any such development makes it impracticable or inadvisable to consummate the sale and delivery of the Shares by the Underwriters at the public offering price.

(e)    Each of the representations and warranties of the Company contained herein shall be true and correct in all respects (in the case of any representation and warranty containing a materiality or Material Adverse Effect qualification) or in all material respects (in the case of any other representation and warranty) at the Closing Date and, with respect to the Option Shares, at the applicable Option Closing Date, and all covenants and agreements contained herein to be performed on the part of the Company and all conditions contained herein to be fulfilled or complied with by the Company at or prior to the Closing Date and, with respect to the Option Shares, at or prior to the applicable Option Closing Date, shall have been duly performed, fulfilled or complied with.

(f)    The Representative shall have received an opinion and negative assurance letter, each dated the Closing Date and, with respect to the Option Shares, the applicable Option Closing Date, from Foley & Lardner LLP, counsel to the Company, in form and substance reasonably satisfactory to counsel to the Underwriters.

(g)    The Representative shall have received an opinion and negative assurance letter, each dated the Closing Date or the applicable Option Closing Date, as the case may be, from DLA Piper LLP (US), counsel to the Underwriters, with respect to the Registration Statement, the Prospectus and this Agreement, which opinion and negative assurance letter shall be satisfactory in all respects to the Representative.

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(h)    Concurrently with the execution and delivery of this Agreement, at the Closing Date and, as to the Option Shares, the applicable Option Closing Date, the Accountants shall have furnished to the Representative a customary “comfort letter” letter, dated the date of its delivery, addressed to the Representative and in form and substance satisfactory to the Representative.

(i)    At the Closing Date and, as to the Option Shares, the applicable Option Closing Date, there shall be furnished to the Representative a certificate, dated the date of its delivery, signed by each of the Chief Financial Officer of the Company, in their capacities as such, in form and substance satisfactory to the Representative, to the effect that:

(i)    Each signer of such certificate has carefully examined the Registration Statement, the Prospectus and the General Disclosure Package (including any documents filed under the Exchange Act and deemed to be incorporated by reference into the Pricing Prospectus and the Prospectus) and (A) as of the date of such certificate, such documents are true and correct in all material respects and do not omit to state a material fact required to be stated therein or necessary in order to make the statements therein not untrue or misleading and (B) in the case of the certificate delivered at the Closing Date and the applicable Option Closing Date, since the Effective Date no event has occurred as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein not untrue or misleading.

(ii)    Each of the representations and warranties of the Company contained in this Agreement were, when originally made, and are, at the time such certificate is delivered, true and correct in all respects (in the case of any representation and warranty containing a materiality or Material Adverse Effect qualification) or in all material respects (in the case of any other representation and warranty).

(iii)    Each of the covenants required to be performed by the Company herein on or prior to the date of such certificate has been duly, timely and fully performed and each condition herein required to be satisfied or fulfilled on or prior to the date of such certificate has been duly, timely and fully satisfied or fulfilled.

(j)    On or prior to the Closing Date, the Representative shall have received the executed agreements referred to in Section 4(m).

(k)    The Shares shall be qualified for sale in such jurisdictions as the Representative may reasonably request and each such qualification shall be in effect and not subject to any stop order or other proceeding on the Closing Date or the applicable Option Closing Date.

(l)    The Company shall have furnished to the Representative such certificates (including a Secretary’s Certificate and any good standing certificates), in addition to those specifically mentioned herein, as the Representative may have reasonably requested as to the accuracy and completeness at the Closing Date and the applicable Option Closing Date of any statement in the Registration Statement, the Prospectus or the General Disclosure Package, as to the accuracy at the Closing Date and the applicable Option Closing Date of the representations and warranties of the Company herein, as to the performance by the Company of its obligations hereunder, or as to the fulfillment of the conditions concurrent and precedent to the obligations hereunder of the Representative.

7.    Indemnification.

(a)    The Company will indemnify and hold harmless each Underwriter, the partners, members, directors, officers, employees, agents and affiliates of each Underwriter and each person, if any, who

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controls each Underwriter within the meaning of Section 15 of the Act or Section 20 of the Exchange Act, from and against any and all losses, claims, liabilities, expenses and damages (including any and all investigative, legal and other expenses reasonably incurred in connection with, and any amount paid in settlement of, any action, suit or proceeding or any claim asserted), to which they, or any of them, may become subject under the Act, the Exchange Act or other federal or state statutory law or regulation, at common law or otherwise, insofar as such losses, claims, liabilities, expenses or damages arise out of or are based on any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, any Preliminary Prospectus, the Base Prospectus, Pricing Prospectus, the Prospectus or any amendment or supplement thereto or any Issuer Free Writing Prospectus or any “issuer information” filed or required to be filed pursuant to Rule 433(d) of the Rules and Regulations, or the omission or alleged omission to state in such document a material fact required to be stated in it or necessary to make the statements in it not misleading in the light of the circumstances in which they were made, or arise out of or are based in whole or in part on any inaccuracy in the representations and warranties of the Company contained herein or any failure of the Company to perform its obligations hereunder or under law in connection with the transactions contemplated hereby; provided, however, that the Company will not be liable to the extent that such loss, claim, liability, expense or damage arises from the sale of the Shares in the public offering to any person by an Underwriter and is based on an untrue statement or omission or alleged untrue statement or omission made in reliance on and in conformity with information relating to any Underwriter furnished in writing to the Company by the Representative, on behalf of any Underwriter, expressly for inclusion in the Registration Statement, any Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus, the Prospectus or any Issuer Free Writing Prospectus. The Company acknowledges that the Underwriter Information constitutes the only information relating to any Underwriter furnished in writing to the Company by the Representative on behalf of the Underwriters expressly for inclusion in the Registration Statement, any Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus, the Prospectus or any Issuer Free Writing Prospectus. This indemnity agreement will be in addition to any liability that the Company might otherwise have.

(b)    Each Underwriter, severally and not jointly, will indemnify and hold harmless the Company, each director of the Company, each officer of the Company who signs the Registration Statement, and each person, if any, who controls the Company within the meaning of Section 15 of the Act or Section 20 of the Exchange Act, to the same extent as the foregoing indemnity from the Company to each Underwriter, as set forth in Section 7(a), but only insofar as losses, claims, liabilities, expenses or damages arise out of or are based on any untrue statement or omission or alleged untrue statement or omission made in reliance on and in conformity with information relating to any Underwriter furnished in writing to the Company by the Representative, on behalf of such Underwriter, expressly for inclusion in the Registration Statement, any Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus, the Prospectus or any Issuer Free Writing Prospectus. The Company acknowledges that the Underwriter Information constitutes the only information relating to any Underwriter furnished in writing to the Company by the Representative on behalf of the Underwriters expressly for inclusion in the Registration Statement, any Preliminary Prospectus, the Base Prospectus, Pricing Prospectus, the Prospectus or any Issuer Free Writing Prospectus. This indemnity will be in addition to any liability that each Underwriter might otherwise have.

(c)    Any party that proposes to assert the right to be indemnified under this Section 7 shall, promptly after receipt of notice of commencement of any action against such party in respect of which a claim is to be made against an indemnifying party or parties under this Section 7, notify each such indemnifying party in writing of the commencement of such action, enclosing with such notice a copy of all papers served, but the omission so to notify such indemnifying party will not relieve it from any liability that it may have to any indemnified party under the foregoing provisions of this Section 7 unless, and only to the extent that, such omission results in the loss of substantive rights or defenses by the indemnifying party. If any such action is brought against any indemnified party and it notifies the indemnifying party of its commencement, the indemnifying party will be entitled to participate in and, to the extent that it elects

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by delivering written notice to the indemnified party promptly after receiving notice of the commencement of the action from the indemnified party, jointly with any other indemnifying party similarly notified, to assume the defense of the action, with counsel reasonably satisfactory to the indemnified party. After notice from the indemnifying party to the indemnified party of its election to assume the defense, the indemnifying party will not be liable to the indemnified party for any legal or other expenses except as provided below and except for the reasonable costs of investigation incurred by the indemnified party in connection with the defense. The indemnified party will have the right to employ its own counsel in any such action, but the fees, expenses and other charges of such counsel will be at the expense of such indemnified party unless (i) the employment of counsel by the indemnified party has been authorized in writing by the indemnifying party, (ii) the indemnified party has reasonably concluded (based on advice of counsel) that there may be legal defenses available to it or other indemnified parties that are different from or in addition to those available to the indemnifying party, (iii) a conflict or potential conflict exists (based on advice of counsel to the indemnified party) between the indemnified party and the indemnifying party (in which case the indemnifying party will not have the right to direct the defense of such action on behalf of the indemnified party), or (iv) the indemnifying party has not in fact employed counsel reasonably satisfactory to the indemnified party to assume the defense of such action within a reasonable time after receiving notice of the commencement of the action, in each of which cases the reasonable fees, disbursements and other charges of counsel will be at the expense of the indemnifying party or parties. It is understood that the indemnifying party or parties shall not, in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the reasonable fees, disbursements and other charges of more than one separate firm admitted to practice in such jurisdiction at any one time for all such indemnified party or parties. All such reasonable fees, disbursements and other charges will be reimbursed by the indemnifying party promptly as they are incurred. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened action in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party unless such settlement (i) includes an unconditional release of such indemnified party from all liability on any claims that are the subject matter of such action and (ii) does not include a statement as to, or an admission of, fault, culpability or a failure to act by or on behalf of an indemnified party. An indemnifying party will not be liable for any settlement of any action or claim effected without its written consent (which consent will not be unreasonably withheld or delayed).

(d)    If the indemnification provided for in this Section 7 is applicable in accordance with its terms but for any reason is held to be unavailable to or insufficient to hold harmless an indemnified party under paragraphs (a), (b) and (c) of this Section 7 in respect of any losses, claims, liabilities, expenses and damages referred to therein, then each applicable indemnifying party, in lieu of indemnifying such indemnified party, shall contribute to the amount paid or payable (including any investigative, legal and other expenses reasonably incurred in connection with, and any amount paid in settlement of, any action, suit or proceeding or any claim asserted, but after deducting any contribution received by the Company from persons other than the Underwriters, such as persons who control the Company within the meaning of the Act, officers of the Company who signed the Registration Statement and directors of the Company, who also may be liable for contribution) by such indemnified party as a result of such losses, claims, liabilities, expenses and damages in such proportion as shall be appropriate to reflect the relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand. The relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand, shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Company bear to the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover page of the Prospectus. If, but only if, the allocation provided by the foregoing sentence is not permitted by applicable law, the allocation of contribution shall be made in such proportion as is appropriate to reflect not only the relative benefits referred to in the foregoing sentence but also the relative fault of the Company, on the one hand, and the Underwriters, on the other hand, with respect to the statements or omissions that resulted in such loss, claim, liability, expense or damage, or action in respect

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thereof, as well as any other relevant equitable considerations with respect to such offering. Such relative fault shall be determined by reference to whether the untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company or the Representative on behalf of the Underwriters, the intent of the parties and their relative knowledge, access to information and opportunity to correct or prevent such statement or omission. The Company and the Underwriters agree that it would not be just and equitable if contributions pursuant to this Section 7(d) were to be determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take into account the equitable considerations referred to herein. The amount paid or payable by an indemnified party as a result of the loss claim, liability, expense or damage, or action in respect thereof, referred to above in this Section 7(d) shall be deemed to include, for purposes of this Section 7(d), any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 7(d), no Underwriter shall be required to contribute any amount in excess of the underwriting discounts and commissions received by it and no person found guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act) will be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations to contribute as provided in this Section 7(d) are several in proportion to their respective underwriting obligations and not joint. For purposes of this Section 7(d), any person who controls a party to this Agreement within the meaning of the Act will have the same rights to contribution as that party, and each officer of the Company who signed the Registration Statement will have the same rights to contribution as the Company, subject in each case to the provisions hereof. Any party entitled to contribution, promptly after receipt of notice of commencement of any action against any such party in respect of which a claim for contribution may be made under this Section 7(d), will notify any such party or parties from whom contribution may be sought, but the omission so to notify will not relieve the party or parties from whom contribution may be sought from any other obligation it or they may have under this Section 7(d). No party will be liable for contribution with respect to any action or claim settled without its written consent (which consent will not be unreasonably withheld).

(e)    The indemnity and contribution agreements contained in this Section 7 and the representations and warranties of the Company contained in this Agreement shall remain operative and in full force and effect regardless of (i) any investigation made by or on behalf of the Underwriters, (ii) acceptance of any of the Shares and payment therefor, or (iii) any termination of this Agreement.

8.    Reimbursement of Certain Expenses. In addition to its other obligations under Section 7(a) of this Agreement, the Company hereby agrees to reimburse the Underwriters on a quarterly basis for all reasonable legal and other expenses incurred in connection with investigating or defending any claim, action, investigation, inquiry or other proceeding arising out of or based upon, in whole or in part, any statement or omission or alleged statement or omission or any inaccuracy in the representations and warranties of the Company contained herein or failure of the Company to perform its obligations hereunder or under law, all as described in Section 7(a), notwithstanding the absence of a judicial determination as to the propriety and enforceability of the obligations under this Section 8 and the possibility that such payment might later be held to be improper; provided, however, that, to the extent any such payment is ultimately held to be improper, the persons receiving such payments shall promptly refund them.

9.    Termination. The obligations of the several Underwriters under this Agreement may be terminated at any time on or prior to the Closing Date (or, with respect to the Option Shares, on or prior to the applicable Option Closing Date), by notice to the Company from the Representative, without liability on the part of any Underwriter to the Company if, prior to delivery and payment for the Firm Shares or Option Shares, as the case may be, in the sole judgment of the Representative, (i) trading in any of the equity securities of the Company shall have been suspended or limited by the Commission or by Nasdaq, (ii) trading in securities generally on Nasdaq shall have been suspended or limited or minimum or maximum

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prices shall have been generally established on such exchange, or additional material governmental restrictions, not in force on the date of this Agreement, shall have been imposed upon trading in securities generally by such exchange, by order of the Commission or any court or other governmental authority or by Nasdaq, (iii) a general banking moratorium shall have been declared by either federal or New York State authorities or any material disruption of the securities settlement or clearance services in the United States shall have occurred, or (iv) any material adverse change in the financial or securities markets in the United States or in political, financial or economic conditions in the United States, any outbreak or material escalation of hostilities involving the United States, a declaration of a national emergency or war by the United States, or other calamity or crisis not in existence on the date hereof, either within or outside the United States, shall have occurred, the effect of which is such as to make it, in the sole judgment of the Representative, impracticable or inadvisable to proceed with completion of the public offering or the delivery of and payment for the Shares.

If this Agreement is terminated pursuant to Section 10 hereof, the Company shall not be under any liability to any Underwriter except as provided in Sections 4(i), 7 and 8 hereof; but, if for any other reason the purchase of the Shares by the Underwriters is not consummated or if for any reason the Company shall be unable to perform its obligations hereunder, the Company will reimburse the Underwriters for all out-of-pocket expenses (including the fees, disbursements and other charges of counsel to the Underwriters) incurred by the Underwriters in connection with the offering of the Shares.

10.    Substitution of Underwriters.

If any one or more of the Underwriters shall fail or refuse to purchase any of the Firm Shares that it or they have agreed to purchase hereunder, and the aggregate number of Firm Shares that such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate number of Firm Shares, the other Underwriters shall be obligated, severally and not jointly, to purchase the Firm Shares that such defaulting Underwriter or Underwriters agreed but failed or refused to purchase, in the proportions which the number of Firm Shares that they have respectively agreed to purchase pursuant to Section 1 bears to the aggregate number of Firm Shares which all such non-defaulting Underwriters have so agreed to purchase, or in such other proportions as the Representative may specify; provided that in no event shall the maximum number of Firm Shares that any Underwriter has become obligated to purchase pursuant to Section 1 be increased pursuant to this Section 10 by more than one-ninth of such number of Firm Shares without the prior written consent of such Underwriter. In any such case either the Representative or the Company shall have the right to postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement and the Prospectus or in any other documents or arrangements may be effected. If any Underwriter or Underwriters shall fail or refuse to purchase any Firm Shares that it or they agreed to purchase hereunder and the aggregate number of Firm Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase exceeds one-tenth of the aggregate number of the Firm Shares and arrangements satisfactory to the Representative and the Company for the purchase of such Firm Shares are not made within 48 hours after such default, this Agreement will terminate without liability on the part of any non-defaulting Underwriter or the Company for the purchase or sale of any Shares under this Agreement. Any action taken pursuant to this Section 10 shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

11.    No Fiduciary Relationship. Notwithstanding any preexisting relationship, advisory or otherwise, between the parties or any oral representations or assurances previously or subsequently made by the Underwriters, the Company acknowledges and agrees that (i) the purchase and sale of the Shares pursuant to this Agreement (including the determination of the terms of the offering of the Shares) is an arm’s-length commercial transaction between the Company and the several Underwriters, (ii) in connection therewith and with the process leading to such transaction, each Underwriter is acting solely as a principal

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and not the agent or fiduciary of the Company, (iii) no Underwriter has assumed an advisory or fiduciary responsibility in favor of the Company with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company on other matters) or any other obligation to the Company except the obligations expressly set forth in this Agreement, (iv) the Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company and have no obligation to disclose or account to the Company for any of such differing interests, and (v) the Company has consulted its own legal, tax, accounting and financial advisors to the extent it deemed appropriate. The Company hereby agrees that it will not claim that the Underwriters, or any of them, have rendered advisory services of any nature or respect, or owe a fiduciary or similar duty to the Company, in connection with such transaction or the process leading thereto.

12.    Miscellaneous. . Notice given pursuant to any of the provisions of this Agreement shall be in writing and, unless otherwise specified, shall be mailed or delivered (a) if to the Company, at the office of the Company, Vicor Corporation, 25 Frontage Road, Andover, MA 01810, Attention of Chief Financial Officer, with a copy to Foley & Lardner LLP, 777 East Wisconsin Avenue, Milwaukee, WI 53202, or (b) if to the Underwriters, to the Representative at the offices of Needham & Company, LLC, 250 Park Avenue, New York, NY 10177, Attention: Corporate Finance Department, with a copy to DLA Piper LLP (US), 401 Congress Avenue, Suite 2500, Austin, TX 78701, telecopy number: (512) 457-7001, Attention: John J. Gilluly III, P.C. Any such notice shall be effective only upon receipt. Any notice under Section 9 or 10 may be made by telecopier or telephone, but if so made shall be subsequently confirmed in writing.

This Agreement has been and is made solely for the benefit of the several Underwriters, the Company, and the controlling persons, directors and officers referred to in Section 7, and their respective successors and assigns, and no other person shall acquire or have any right under or by virtue of this Agreement. The term “successors and assigns” as used in this Agreement shall not include a purchaser, as such purchaser, of Shares from any of the several Underwriters.

This Agreement shall be governed by and construed in accordance with the laws of the State of New York applicable to contracts made and to be performed entirely within such State.

Any action required or permitted to be made by the Representative under this Agreement may be taken by Needham & Company, LLC.

As used in this Agreement, “business day” means any day on which Nasdaq is open for trading, “knowledge” means the knowledge of the directors and officers of the Company after reasonable inquiry.

This Agreement may be signed in two or more counterparts with the same effect as if the signatures thereto and hereto were upon the same instrument.

In case any provision in this Agreement shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

Each of the Company and the Underwriters hereby waives any right it may have to a trial by jury in respect of any claim based upon or arising out of this Agreement or the transactions contemplated hereby.

13.    Recognition of the U.S. Special Resolution Regimes.

(a)    In the event that any Underwriter that is a Covered Entity becomes subject to a proceeding under a U.S. Special Resolution Regime, the transfer from such Underwriter of this Agreement, and any interest and obligation in or under this

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Agreement, will be effective to the same extent as the transfer would be effective under the U.S. Special Resolution Regime if this Agreement, and any such interest and obligation, were governed by the laws of the United States or a state of the United States.

(b)    In the event that any Underwriter that is a Covered Entity or a BHC Act Affiliate of such Underwriter becomes subject to a proceeding under a U.S. Special Resolution Regime, Default Rights under this Agreement that may be exercised against such Underwriter are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S. Special Resolution Regime if this Agreement were governed by the laws of the United States or a state of the United States.

As used in this Section 17:

“BHC Act Affiliate” has the meaning assigned to the term “affiliate” in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k).

“Covered Entity” means any of the following:

(i) a “covered entity” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 252.82(b);

(ii) a “covered bank” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 47.3(b); or

(iii) a “covered FSI” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 382.2(b).

“Default Right” has the meaning assigned to that term in, and shall be interpreted in accordance with, 12 C.F.R. §§ 252.81, 47.2 or 382.1, as applicable.

“U.S. Special Resolution Regime” means each of (i) the Federal Deposit Insurance Act and the regulations promulgated thereunder and (ii) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder.

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Please confirm that the foregoing correctly sets forth the agreement among the Company and the several Underwriters.

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SCHEDULE I

UNDERWRITERS

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SCHEDULE II

Issuer General Use Free Writing Prospectuses:

None

Permitted Free Writing Prospectuses:

None

Additional Documents Incorporated by Reference:

None

Other Information Included in the General Disclosure Package:

The following information is also included in the General Disclosure Package:

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SCHEDULE III

FORM OF LOCK-UP AGREEMENT

[See attached]

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NEEDHAM & COMPANY, LLC

As Representative of the several Underwriters

  c/o Needham & Company, LLC

445 Park Avenue

New York, New York 10022

Ladies and Gentlemen:

The undersigned understands Needham & Company, LLC (the “Representatives”) proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) with Vicor Corporation, a Delaware corporation (the “Company”), providing for a public offering (the “Offering”) by the several underwriters listed in Schedule I of the Underwriting Agreement (the “Underwriters”) of shares of Class A common stock, par value $0.01 per share (the “Common Stock”), of the Company. The undersigned recognizes such Offering will be of benefit to the undersigned.

To induce the Underwriters that may participate in the Offering to continue their efforts in connection with the Offering, the undersigned hereby agrees that, during the period commencing as of the date hereof and ending on the date that is 90 days after the date of the final prospectus supplement relating to the Offering (the “Final Prospectus Supplement”) (such period, the “Lock-Up Period”), the undersigned will not, without the prior written approval of Needham & Company, LLC, directly or indirectly, (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock beneficially owned (as such term is used in Rule 13d-3 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), by the undersigned or any other securities so owned convertible into or exercisable or exchangeable for Common Stock (such shares of Common Stock or such other securities collectively, the “Securities”), (2) enter into any hedging, swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Securities, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of the Securities, in cash or otherwise, (3) make any demand for, or exercise any right with respect to, the registration of any Securities or (4) publicly disclose the intention to do any of the foregoing. The foregoing sentence shall not apply to:

(a)    (i) issuances of securities solely made in connection with exercises of outstanding stock options or warrants of the Company, provided that any shares of Common Stock received upon such exercise will be subject to the trading restrictions discussed above or (ii) the transfer of shares of Common Stock or any securities convertible into Common Stock to the Company upon a vesting event of the Company’s securities or upon the exercise of options or warrants to purchase the Company’s securities on a “cashless” or “net exercise” basis to the extent permitted by the instruments representing such options or warrants, so long as such “cashless” exercise or “net exercise” is effected solely by the surrender of outstanding options or warrants to the Company, and the Company’s cancellation of all or a portion thereof to pay the exercise price and/or withholding tax obligations, but for the avoidance of doubt, excluding all methods of exercise that would involve a sale of any shares of Common Stock relating to options or warrants, whether to cover the applicable exercise price, withholding tax obligations or otherwise;

(b)    a transfer of Common Stock or securities convertible into, or exercisable or exchangeable for Common Stock to immediate family members, family partnerships, or trusts, the only partners or beneficiaries of which are the undersigned and/or a member of his or her immediate family;

(c)     transfers upon the death of the undersigned to his or her executors, legatees or beneficiaries or a bona fide gift;

(d)    transactions relating to shares of Common Stock or other securities acquired in the Public Offering or in open market transactions after the completion of the Public Offering;

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

(f)    the transfer of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock that occurs by operation of law pursuant to a qualified domestic order in connection with a divorce settlement or other court order;

(g)    any transfer of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock to the Company pursuant to arrangements under which the Company has the option to repurchase such shares or a right of first refusal with respect to transfers of such shares;

(h)    the transfer of shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock pursuant to a bona fide third-party tender offer, merger, consolidation or other similar transaction that is approved by the board of directors of the Company, made to all holders of Common Stock involving a Change of Control (as defined below), provided that in the event that the tender offer, merger, consolidation or other such transaction is not completed, the Common Stock owned by the undersigned shall remain subject to the restrictions contained in this lock-up agreement; and

(i)    the transfer of shares of Class B common stock of the Company in connection with the conversion of such stock into Common Stock, provided that any shares of Common Stock received upon such conversion shall be subject to the terms of this lock-up agreement;

provided that, (i) in the case of any transfers pursuant to clauses (b) and (c) above, each transferee or donee agrees to be bound in writing by the terms of this Agreement prior to such transfer, (ii) in the case of (b), (c) and (d) no filing by any party (donor, donee, transferor or transferee) under Section 16(a) of the Securities Exchange Act of 1934 shall be required or shall be made voluntarily in connection with such transfer (other than a filing on Form 5 made after

the expiration of the Lock-Up Period), and (iii) that in the case of any transfer pursuant to clause (f) and (g), any filings under Section 16(a) of the Exchange Act shall state that the transfer is by operation of law, court order, in connection with a divorce settlement, or a repurchase by the Company, as the case may be.

For purposes of clause (b), “immediate family” shall mean any relationship by blood, marriage or adoption, not more remote than first cousin.

For purposes of clause (h), “Change of Control” shall mean the transfer (whether by tender offer, merger, consolidation or other similar transaction), in one transaction or a series of related transactions, to a person or group of affiliated persons (other than an Underwriter pursuant to the Public Offering), of the Company’s voting securities if, after such transfer, such person or group of affiliated persons would hold more than 65% of the number of outstanding voting securities of the Company (or the surviving entity) and 65% of the voting control of the outstanding voting securities of the Company (or the surviving entity).

The undersigned confirms that he, she or it understands that the underwriters and the Company will rely upon the representations set forth in this Agreement in proceeding with the Offering. The undersigned further confirms that the agreements of the undersigned are irrevocable and shall be binding upon the undersigned’s heirs, legal representatives, successors and assigns. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the undersigned’s shares of Common Stock except in compliance with the foregoing restrictions.

This agreement shall automatically terminate upon the earliest to occur, if any, of (a) the date the Company notifies the Representatives in writing prior to the execution of the Underwriting Agreement that the Company does not intend to proceed with the Offering; (b) the termination date of the Underwriting Agreement (other than the provisions thereof that survive termination), provided that no Securities have been delivered and paid for pursuant to the Underwriting Agreement before such date; and (c) July 15, 2020 in the event that the Underwriting Agreement has not been executed by such date (provided that the Company may by written notice to the undersigned on or prior to July 15, 2020 extend such date for a period of up to an additional three months), if the Underwriting Agreement has been executed by that date.

This agreement may be delivered via facsimile, electronic mail (including any electronic signature covered by the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act, the Electronic Signatures and Records Act or other applicable law, e.g., www.docusign.com) or other transmission method and any counterpart so delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes.

This agreement and any claim, controversy or dispute arising under or related to this agreement shall be governed by and construed in accordance with the laws of the State of New York.

[remainder of the page intentionally blank]

Exhibit 5.1

Vicor Corporation

25 Frontage Road

Andover, Massachusetts 01810

Ladies and Gentlemen:

We have acted as counsel for Vicor Corporation, a Delaware corporation (the “Company”), in connection with the preparation of a Registration Statement on Form S-3 (the “Registration Statement”), including the prospectus constituting a part thereof (the “Prospectus”), filed on June 9, 2020 by the Company with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”). The Registration Statement and the Prospectus relate to the issuance and sale by the Company of (i) 1,538,462 shares of the Company’s common stock, par value $0.01 per share (the “Common Stock”) in a public offering and (ii) up to 230,769 additional shares of Common Stock pursuant to the option to purchase additional shares granted by the Company to the underwriters for such public offering in the manner set forth in the Prospectus (the shares of Common Stock described in clauses (i) and (ii) are collectively referred to as the “Offering Shares”).

In connection with our representation, we have examined: (a) the Registration Statement, including the Prospectus and the exhibits (including those incorporated by reference) constituting a part of the Registration Statement; (b) the Restated Certificate of Incorporation of the Company, as amended to date; (c) the By-Laws of the Company, as amended to date; (d) resolutions of the Company’s Board of Directors relating to the filing of the Registration Statement and the sale or resale of the Common Stock covered by the Registration Statement, including the resolutions of the Special Pricing Committee of the Board of Directors (the “Special Pricing Committee”) relating to the authorization of the issuance of the Offering Shares subject to the Registration Statement; and (e) such other proceedings, documents and records as we have deemed necessary to enable us to render this opinion.

In our examination of the above-referenced documents, we have assumed the genuineness of all signatures, the authenticity of all documents, certificates and instruments submitted to us as originals and the conformity with the originals of all documents submitted to us as copies.

Based on the foregoing, we are of the opinion that:

1.    The Company is a corporation validly existing and in good standing under the laws of the State of Delaware.

Vicor Corporation

June 12, 2020

Page 2

2.    The Offering Shares, when sold for the consideration contemplated by, and otherwise in conformity with, the Registration Statement, as supplemented by a Prospectus Supplement with respect to such sale, will be validly issued, fully paid and nonassessable.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the reference to our firm under the caption “Legal Matters” in the Prospectus forming a part thereof. In giving our consent, we do not admit that we are “experts” within the meaning of Section 11 of the Securities Act or within the category of persons whose consent is required by Section 7 of the Securities Act.

Exhibit 99.1

Vicor Corporation Announces Pricing of Public Offering of Common Stock

ANDOVER, Mass., June 10, 2020 — Vicor Corporation (NASDAQ: VICR), a leading provider of high performance power components and systems, today announced the pricing of its public offering of $100 million of shares of its common stock at a price to the public of $65.00 per share. In addition, the underwriters have been granted a 30-day option to purchase up to $15 million of additional shares of common stock from Vicor. The offering is expected to close on June 15, 2020, subject to customary closing conditions.

Needham & Company is acting as the sole book-running manager for the offering. Craig-Hallum Capital Group is acting as the co-manager for the offering.

Vicor intends to use the net proceeds from the offering for the expansion of its manufacturing facilities and other general corporate purposes.

The offering is being made pursuant to an automatic shelf registration statement on Form S-3, including a base prospectus, filed on June 9, 2020 by Vicor with the Securities and Exchange Commission (SEC), which registration statement was effective upon filing. The offering will be made only by means of a prospectus supplement and accompanying prospectus. Copies of the final prospectus supplement, when available, and the accompanying prospectus may be obtained from: Needham & Company, 250 Park Avenue, 10th Floor, New York, New York 10177 or by telephone at 800-903-3268; or Craig-Hallum Capital Group, 222 South 9th Street, Suite 350, Minneapolis, Minnesota 55402 or by telephone at 612-334-6300.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Any statement in this press release that is not a statement of historical fact is a forward-looking statement, and, the words “believes,” “expects,” “anticipates,” “intends,” “estimates,” “plans,” “assumes,” “may,” “will,” “would,” “should,” “continue,” “prospective,” “project,” and other similar expressions identify forward-looking statements. Forward-looking statements also include statements regarding the offering, the use of proceeds from the offering, bookings, shipments, revenue, profitability, targeted markets, increase in manufacturing capacity and utilization thereof, future products and capital resources. These statements are based upon management’s current expectations and estimates as to the prospective events and circumstances that may or may not be within the company’s control and as to which there can be no assurance. Actual results could differ materially from those projected in the forward-looking statements as a result of various factors, including those economic, business, operational and financial considerations set forth in Vicor’s Annual Report on Form 10-K for the year ended December 31, 2019, under Part I, Item I — “Business,” under Part I, Item 1A — “Risk Factors,” under Part I, Item 3 — “Legal Proceedings,” and under Part II, Item 7 — “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and those described in Vicor’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2020, under Part I, Item 2 — “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Part II, Item 1A — “Risk Factors.” The risk factors set forth in the Annual Report on Form 10-K and the Quarterly Report on Form 10-Q may not be exhaustive. Therefore, the information contained in the Annual Report on Form 10-K and the Quarterly Report on Form 10-Q should be read together with other reports and documents filed with the Securities and Exchange Commission from time to time, including Forms 10-Q, 8-K and 10-K, which may supplement, modify, supersede or update those risk factors. Vicor does not undertake any obligation to update any forward-looking statements as a result of future events or developments.

About Vicor Corporation

Vicor Corporation designs, develops, manufactures and markets modular power components and complete power systems based upon a portfolio of patented technologies. Headquartered in Andover, Massachusetts, Vicor sells its products primarily to customers in the higher-performance, higher-power segments of the power systems market, including aerospace and defense electronics, enterprise and high performance computing, industrial equipment and automation, telecommunications and network infrastructure, and vehicles and transportation markets.

For further information contact:

James A. Simms, Chief Financial Officer

Voice: 978-470-2900

Facsimile: 978-749-3439

invrel@vicorpower.com