EX-4.3



 Exhibit 4.3 

BARRACUDA NETWORKS, INC. 

2015 EMPLOYEE STOCK PURCHASE PLAN 

1. Purpose. The purpose of the Plan is to provide employees of the Company and its Designated Companies with an opportunity to purchase
Common Stock through accumulated Contributions. The Company intends for the Plan to have two components: a Code Section 423 component (the “423 Component”) and a non-Code Section 423 component (the “Non-423
Component”). The Company’s intention is to have the 423 Component qualify as an “employee stock purchase plan” under Section 423 of the Code. The provisions of the 423 Component, accordingly, will be construed so as to
extend and limit Plan participation in a uniform and nondiscriminatory basis consistent with the requirements of Section 423 of the Code. In addition, this Plan authorizes the grant of an option to purchase shares of Common Stock under the
Non-423 Component that does not qualify as an “employee stock purchase plan” under Section 423 of the Code; such an option will be granted pursuant to rules, procedures or sub-plans adopted by the Administrator designed to achieve
tax, securities laws or other objectives for Eligible Employees and the Company. Except as otherwise provided herein, the Non-423 Component will operate and be administered in the same manner as the 423 Component. 

2. Definitions. 
 (a)
“Administrator” means the Board or any Committee designated by the Board to administer the Plan pursuant to Section 14. 

(b) “Affiliate” means any entity, other than a Subsidiary, in which the Company has an equity or other ownership interest.

 (c) “Applicable Laws” means the requirements relating to the administration of equity-based awards under U.S. state
corporate laws, U.S. federal and state securities laws, the Code, any stock exchange or quotation system on which the Common Stock is listed or quoted and the applicable laws of any foreign country or jurisdiction where options are, or will be,
granted under the Plan. 
 (d) “Board” means the Board of Directors of the Company. 

(e) “Change in Control” means the occurrence of any of the following events: 

(i) A change in the ownership of the Company which occurs on the date that any one person, or more than one person acting as a group
(“Person”), acquires ownership of the stock of the Company that, together with the stock held by such Person, constitutes more than 50% of the total voting power of the stock of the Company; provided, however, that for purposes of
this subsection, the acquisition of additional stock by any one Person, who is considered to own more than 50% of the total voting power of the stock of the Company will not be considered a Change in Control; or 

(ii) A change in the effective control of the Company which occurs on the date that a majority of members of the Board is replaced during any
12-month period by Directors whose appointment or election is not endorsed by a majority of the members of the Board prior to the date of the appointment or election. For purposes of this clause (ii), if any Person is considered to be in effective
control of the Company, the acquisition of additional control of the Company by the same Person will not be considered a Change in Control; or 

(iii) A change in the ownership of a substantial portion of the Company’s assets which occurs on the date that any Person acquires (or
has acquired during the 12-month period ending on the date of the most recent acquisition by such person or persons) assets from the Company that have a total gross fair market value equal to or more than 50% of the total gross fair market value of
all of the assets of the Company immediately 

  
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prior to such acquisition or acquisitions; provided, however, that for purposes of this subsection, the following will not constitute a change in the ownership of a substantial portion of the
Company’s assets: (A) a transfer to an entity that is controlled by the Company’s stockholders immediately after the transfer, or (B) a transfer of assets by the Company to: (1) a stockholder of the Company (immediately
before the asset transfer) in exchange for or with respect to the Company’s stock, (2) an entity, 50% or more of the total value or voting power of which is owned, directly or indirectly, by the Company, (3) a Person, that owns,
directly or indirectly, 50% or more of the total value or voting power of all the outstanding stock of the Company, or (4) an entity, at least 50% of the total value or voting power of which is owned, directly or indirectly, by a Person
described in this subsection (iii)(B)(3). For purposes of this subsection, gross fair market value means the value of the assets of the Company, or the value of the assets being disposed of, determined without regard to any liabilities associated
with such assets. 
 For purposes of this definition, persons will be considered to be acting as a group if they are owners of a corporation
that enters into a merger, consolidation, purchase or acquisition of stock, or similar business transaction with the Company. 

Notwithstanding the foregoing, a transaction will not be deemed a Change in Control unless the transaction qualifies as a change in control
event within the meaning of Code Section 409A, as it has been and may be amended from time to time, and any proposed or final U.S. Treasury Regulations and Internal Revenue Service guidance that has been promulgated or may be promulgated
thereunder from time to time. 
 Further and for the avoidance of doubt, a transaction will not constitute a Change in Control if:
(i) its sole purpose is to change the state of the Company’s incorporation, or (ii) its sole purpose is to create a holding company that will be owned in substantially the same proportions by the persons who held the Company’s
securities immediately before such transaction. 
 (f) “Code” means the U.S. Internal Revenue Code of 1986, as amended.
Reference to a specific section of the Code or U.S. Treasury Regulation thereunder will include such section or regulation, any valid regulation or other official applicable guidance promulgated under such section, and any comparable provision of
any future legislation or regulation amending, supplementing or superseding such section or regulation. 
 (g) “Committee”
means a committee of the Board appointed in accordance with Section 14 hereof. 
 (h) “Common Stock” means the common
stock of the Company. 
 (i) “Company” means Barracuda Networks, Inc., a Delaware corporation, or any successor thereto.

 (j) “Compensation” means an Eligible Employee’s base straight time gross earnings, but exclusive of payments for
incentive compensation, bonuses, payments for overtime and shift premium, equity compensation income and other similar compensation. The Administrator, in its discretion, may, on a uniform and nondiscriminatory basis, establish a different
definition of Compensation for a subsequent Offering Period. 
 (k) “Contributions” means the payroll deductions and other
additional payments that the Company may permit to be made by a Participant to fund the exercise of options granted pursuant to the Plan. 

(l) “Designated Company” means any Subsidiary or Affiliate that has been designated by the Administrator from time to time in
its sole discretion as eligible to participate in the Plan. For purposes of the 423 Component, only the Company and its Subsidiaries may be Designated Companies, provided, however that at any given time, a Subsidiary that is a Designated Company
under the 423 Component will not be a Designated Company under the Non-423 Component. 
 (m) “Director” means a member of
the Board. 

  
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 (n) “Eligible Employee” means any individual who is a common law employee
providing services to the Company or a Designated Company and is customarily employed for at least 20 hours per week and more than five months in any calendar year by the Employer, or any lesser number of hours per week and/or number of months
in any calendar year established by the Administrator (if required under applicable local law) for purposes of any separate Offering or for Eligible Employees participating in the Non-423 Component. For purposes of the Plan, the employment
relationship will be treated as continuing intact while the individual is on sick leave or other leave of absence that the Employer approves or is legally protected under Applicable Laws. Where the period of leave exceeds three months and the
individual’s right to reemployment is not guaranteed either by statute or by contract, the employment relationship will be deemed to have terminated three months and one day following the commencement of such leave. The Administrator, in its
discretion, from time to time may, prior to an Enrollment Date for all options to be granted on such Enrollment Date in an Offering, determine (on a uniform and nondiscriminatory basis or as otherwise permitted by Treasury Regulation Section 1.423-2) that the definition of Eligible Employee will or will not include an individual if he or she: (i) has not completed at least two years of service since his or her last hire date (or such
lesser period of time as may be determined by the Administrator in its discretion), (ii) customarily works not more than 20 hours per week (or such lesser period of time as may be determined by the Administrator in its discretion),
(iii) customarily works not more than five months per calendar year (or such lesser period of time as may be determined by the Administrator in its discretion), (iv) is a highly compensated employee within the meaning of
Section 414(q) of the Code, or (v) is a highly compensated employee within the meaning of Section 414(q) of the Code with compensation above a certain level or is an officer or subject to the disclosure requirements of
Section 16(a) of the Exchange Act, provided the exclusion is applied with respect to each Offering in an identical manner to all highly compensated individuals of the Employer whose Employees are participating in that Offering. Each exclusion
will be applied with respect to an Offering in a manner complying with U.S. Treasury Regulation Section 1.423-2(e)(2)(ii). 

(o) “Employer” means the employer of the applicable Eligible Employee(s). 

(p) “Enrollment Date” means the first Trading Day of each Offering Period. 

(q) “Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended, including the rules and regulations
promulgated thereunder. 
 (r) “Exercise Date” means the first Trading Day on or after October 31 and April 30 of
each Purchase Period. The first Exercise Date under the Plan will be April 30, 2016. 
 (s) “Fair Market Value” means,
as of any date and unless the Administrator determines otherwise, the value of Common Stock determined as follows: 
 (i) If the Common
Stock is listed on any established stock exchange or a national market system, including without limitation the New York Stock Exchange, the NASDAQ Global Select Market, the NASDAQ Global Market, or the NASDAQ Capital Market of The NASDAQ Stock
Market, its Fair Market Value will be the closing sales price for such stock (or the closing bid, if no sales were reported) as quoted on such exchange or system on the date of determination (or on the last preceding Trading Day if the date of
determination is not a Trading Day), as reported in The Wall Street Journal or such other source as the Administrator deems reliable; 

(ii) If the Common Stock is regularly quoted by a recognized securities dealer but selling prices are not reported, the Fair Market Value of
a Share will be the mean between the high bid and low asked prices for the Common Stock on the date of determination (or if no bids and asks were reported on that date, as applicable, on the last Trading Day such bids and asks were reported), as
reported in The Wall Street Journal or such other source as the Administrator deems reliable; or 
 (iii) In the absence of an
established market for the Common Stock, the Fair Market Value thereof will be determined in good faith by the Administrator. 

  
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 (t) “Fiscal Year” means the fiscal year of the Company. 

(u) “New Exercise Date” means a new Exercise Date if the Administrator shortens any Offering Period then in progress. 

(v) “Offering” means an offer under the Plan of an option that may be exercised during an Offering Period as further
described in Section 4. For purposes of the Plan, the Administrator may designate separate Offerings under the Plan (the terms of which need not be identical) in which Eligible Employees of one or more Employers will participate, even if the
dates of the applicable Offering Periods of each such Offering are identical and the provisions of the Plan will separately apply to each Offering. To the extent permitted by U.S. Treasury Regulation
Section 1.423-2(a)(1), the terms of each Offering need not be identical provided that the terms of the Plan and an Offering together satisfy U.S. Treasury Regulation
Section 1.423-2(a)(2) and (a)(3). 
 (w) “Offering Periods” means the
periods of approximately 6 months during which an option granted pursuant to the Plan may be exercised, (i) commencing on the first Trading Day on or after April 30 and October 31 of each year and terminating on the first Trading Day
on or after October 31 and April 30, approximately 6 months later; provided, however, that the first Offering Period under the Plan will commence with the first Trading Day on or after October 31, 2015 and will end on the first
Trading Day on or after April 30, 2016. The duration and timing of Offering Periods may be changed pursuant to Sections 4 and 20. 

(x) “Parent” means a “parent corporation,” whether now or hereafter existing, as defined in Section 424(e) of
the Code. 
 (y) “Participant” means an Eligible Employee that participates in the Plan. 

(z) “Plan” means this Barracuda Networks, Inc. 2015 Employee Stock Purchase Plan. 

(aa) “Purchase Period” means the approximately six-month period commencing after one Exercise Date and ending with the next
Exercise Date, except that the first Purchase Period of any Offering Period will commence on the Enrollment Date and end with the next Exercise Date. 

(bb) “Purchase Price” means an amount equal to 85% of the Fair Market Value of a share of Common Stock on the Enrollment Date
or on the Exercise Date, whichever is lower; provided however, that the Purchase Price may be determined for subsequent Offering Periods by the Administrator subject to compliance with Section 423 of the Code (or any successor rule or provision
or any other Applicable Law, regulation or stock exchange rule) or pursuant to Section 20. 
 (cc) “Subsidiary” means
a “subsidiary corporation,” whether now or hereafter existing, as defined in Section 424(f) of the Code. 
 (dd)
“Trading Day” means a day on which the national stock exchange upon which the Common Stock is listed is open for trading. 

(ee) “U.S. Treasury Regulations” means the Treasury regulations of the Code. Reference to a specific Treasury Regulation or
Section of the Code will include such Treasury Regulation or Section, any valid regulation promulgated under such Section, and any comparable provision of any future legislation or regulation amending, supplementing or superseding such Section or
regulation. 
 3. Eligibility. 

(a) Offering Periods. Any Eligible Employee on a given Enrollment Date will be eligible to participate in the Plan, subject to the
requirements of Section 5. 

  
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 (b) Non-U.S. Employees. Eligible Employees who are citizens or residents of a non-U.S.
jurisdiction (without regard to whether they also are citizens or residents of the United States or resident aliens (within the meaning of Section 7701(b)(1)(A) of the Code)) may be excluded from participation in the Plan or an Offering if the
participation of such Eligible Employees is prohibited under the laws of the applicable jurisdiction or if complying with the laws of the applicable jurisdiction would cause the Plan or an Offering to violate Section 423 of the Code. In the
case of the Non-423 Component, Eligible Employees may be excluded from participation in the Plan or an Offering if the Administrator has determined that participation of such Eligible Employees is not advisable or practicable. 

(c) Limitations. Any provisions of the Plan to the contrary notwithstanding, no Eligible Employee will be granted an option under the
Plan (i) to the extent that, immediately after the grant, such Eligible Employee (or any other person whose stock would be attributed to such Eligible Employee pursuant to Section 424(d) of the Code) would own capital stock of the Company
or any Parent or Subsidiary of the Company and/or hold outstanding options to purchase such stock possessing five percent or more of the total combined voting power or value of all classes of the capital stock of the Company or of any Parent or
Subsidiary of the Company, or (ii) to the extent that his or her rights to purchase stock under all employee stock purchase plans (as defined in Section 423 of the Code) of the Company or any Parent or Subsidiary of the Company accrues at
a rate, which exceeds $25,000 worth of stock (determined at the Fair Market Value of the stock at the time such option is granted) for each calendar year in which such option is outstanding at any time, as determined in accordance with
Section 423 of the Code and the regulations thereunder. 
 4. Offering Periods. The Plan will be implemented by consecutive
Offering Periods with a new Offering Period commencing on the first Trading Day on or after April 30 and October 31 each year, or on such other date as the Administrator will determine; provided, however, that the first Offering Period
under the Plan will commence with the first Trading Day on or after October 31, 2015 and end on the first Trading Day on or after April 30, 2016. The Administrator will have the power to change the duration of Offering Periods, and the
commencement dates of the initial or future Offerings without stockholder approval if such change is announced prior to the scheduled beginning of the first Offering Period to be affected thereafter; provided, however, that no Offering Period may
last more than 27 months. 
 5. Participation. An Eligible Employee may participate in the Plan pursuant to Section 3(a) by
(i) submitting to the Company’s stock administration office (or its designee), on or before a date determined by the Administrator prior to an applicable Enrollment Date, a properly completed subscription agreement authorizing
Contributions in the form provided by the Administrator for such purpose, or (ii) following an electronic or other enrollment procedure determined by the Administrator. 

6. Contributions. 
 (a)
At the time a Participant enrolls in the Plan pursuant to Section 5, he or she will elect to have Contributions (in the form of payroll deductions or otherwise, to the extent permitted by the Administrator) made on each pay day during the
Offering Period in an amount not exceeding 10% of the Compensation that he or she receives on each pay day during the Offering Period (for illustrative purposes, should a pay day occur on an Exercise Date, a Participant will have any payroll
deductions made on such day applied to his or her account under the then-current Purchase Period or Offering Period), up to a maximum aggregate Contribution per Purchase Period of $10,000 (or such lesser amount determined by the Administrator in
advance of the applicable Offering Period). The Administrator, in its sole discretion, may permit all Participants in a specified Offering to contribute amounts to the Plan through payment by cash, check or other means set forth in the subscription
agreement prior to each Exercise Date of each Purchase Period. A Participant’s subscription agreement will remain in effect for successive Offering Periods unless terminated as provided in Section 10 hereof. 

(b) In the event Contributions are made in the form of payroll deductions, such payroll deductions for a Participant will commence on the
first pay day following the Enrollment Date and will end on the last pay day 

  
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prior to the Exercise Date of such Offering Period to which such authorization is applicable, unless sooner terminated by the Participant as provided in Section 10 hereof. 

(c) All Contributions made for a Participant will be credited to his or her account under the Plan and Contributions will be made in whole
percentages only. A Participant may not make any additional payments into such account. 
 (d) A Participant may discontinue his or her
participation in the Plan as provided in Section 10. Except as may be permitted by the Administrator, as determined in its sole discretion, a Participant may not change the rate of his or her Contributions during an Offering Period. 

(e) Notwithstanding the foregoing, to the extent necessary to comply with Section 423(b)(8) of the Code and Section 3(c), a
Participant’s Contributions may be decreased to zero percent at any time during a Purchase Period. Subject to Section 423(b)(8) of the Code and Section 3(c) hereof, Contributions will recommence at the rate originally elected by the
Participant effective as of the beginning of the first Purchase Period scheduled to end in the following calendar year, unless terminated by the Participant as provided in Section 10. 

(f) Notwithstanding any provisions to the contrary in the Plan, the Administrator may allow Eligible Employees to participate in the Plan via
cash contributions instead of payroll deductions if (i) payroll deductions are not permitted under applicable local law, (ii) the Administrator determines that cash contributions are permissible under Section 423 of the Code or
(iii) for Participants participating in the Non-423 Component. 
 (g) At the time the option is exercised, in whole or in part, or at
the time some or all of the Common Stock issued under the Plan is disposed of (or any other time that a taxable event related to the Plan occurs), the Participant must make adequate provision for the Company’s or Employer’s federal, state,
local or any other tax liability payable to any authority including taxes imposed by jurisdictions outside of the U.S., national insurance, social security or other tax withholding obligations, if any, which arise upon the exercise of the option or
the disposition of the Common Stock (or any other time that a taxable event related to the Plan occurs). At any time, the Company or the Employer may, but will not be obligated to, withhold from the Participant’s compensation the amount
necessary for the Company or the Employer to meet applicable withholding obligations, including any withholding required to make available to the Company or the Employer any tax deductions or benefits attributable to sale or early disposition of
Common Stock by the Eligible Employee. In addition, the Company or the Employer may, but will not be obligated to, withhold from the proceeds of the sale of Common Stock or any other method of withholding the Company or the Employer deems
appropriate to the extent permitted by U.S. Treasury Regulation Section 1.423-2(f). 
 7.
Grant of Option. On the Enrollment Date of each Offering Period, each Eligible Employee participating in such Offering Period will be granted an option to purchase on each Exercise Date during such Offering Period (at the applicable Purchase
Price) up to a number of shares of Common Stock determined by dividing such Eligible Employee’s Contributions accumulated prior to such Exercise Date and retained in the Eligible Employee’s account as of the Exercise Date by the applicable
Purchase Price; provided that in no event will an Eligible Employee be permitted to purchase during each Purchase Period more than the number of shares of Common Stock equal to two (2) times the quotient of: (a) $10,000 (or such lesser
amount determined by the Administrator in advance of the applicable Offering Period) divided by (b) 85% of the Fair Market Value of a share of Common Stock on the Enrollment Date of the Offering Period, rounded up to the nearest whole Share
(subject to any adjustment pursuant to Section 19) and provided further that such purchase will be subject to the limitations set forth in Sections 3(c) and 13. The Eligible Employee may accept the grant of such option by electing to
participate in the Plan in accordance with the requirements of Section 5. The Administrator may, for future Offering Periods, increase or decrease, in its absolute discretion, the maximum number of shares of Common Stock that an Eligible
Employee may purchase during each Purchase Period of an Offering Period. Exercise of the option will occur as provided in Section 8, unless the Participant has withdrawn pursuant to Section 10. The option will expire on the last day of the
Offering Period. 

  
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 8. Exercise of Option. 

(a) Unless a Participant withdraws from the Plan as provided in Section 10, his or her option for the purchase of shares of Common Stock
will be exercised automatically on the Exercise Date, and the maximum number of full shares subject to the option will be purchased for such Participant at the applicable Purchase Price with the accumulated Contributions from his or her account. No
fractional shares of Common Stock will be purchased; any Contributions accumulated in a Participant’s account, which are not sufficient to purchase a full share will be retained in the Participant’s account for the subsequent Purchase
Period or Offering Period, subject to earlier withdrawal by the Participant as provided in Section 10. Any other funds left over in a Participant’s account after the Exercise Date will be returned to the Participant. During a
Participant’s lifetime, a Participant’s option to purchase shares hereunder is exercisable only by him or her. 
 (b) If the
Administrator determines that, on a given Exercise Date, the number of shares of Common Stock with respect to which options are to be exercised may exceed (i) the number of shares of Common Stock that were available for sale under the Plan on
the Enrollment Date of the applicable Offering Period, or (ii) the number of shares of Common Stock available for sale under the Plan on such Exercise Date, the Administrator may in its sole discretion (x) provide that the Company will
make a pro rata allocation of the shares of Common Stock available for purchase on such Enrollment Date or Exercise Date, as applicable, in as uniform a manner as will be practicable and as it will determine in its sole discretion to be equitable
among all Participants exercising options to purchase Common Stock on such Exercise Date, and continue all Offering Periods then in effect or (y) provide that the Company will make a pro rata allocation of the shares available for purchase on
such Enrollment Date or Exercise Date, as applicable, in as uniform a manner as will be practicable and as it will determine in its sole discretion to be equitable among all participants exercising options to purchase Common Stock on such Exercise
Date, and terminate any or all Offering Periods then in effect pursuant to Section 20. The Company may make a pro rata allocation of the shares available on the Enrollment Date of any applicable Offering Period pursuant to the preceding
sentence, notwithstanding any authorization of additional shares for issuance under the Plan by the Company’s stockholders subsequent to such Enrollment Date. 

9. Delivery. As soon as reasonably practicable after each Exercise Date on which a purchase of shares of Common Stock occurs, the
Company will arrange the delivery to each Participant of the shares purchased upon exercise of his or her option in a form determined by the Administrator (in its sole discretion) and pursuant to rules established by the Administrator. The Company
may permit or require that shares be deposited directly with a broker designated by the Company or to a designated agent of the Company, and the Company may utilize electronic or automated methods of share transfer. The Company may require that
shares be retained with such broker or agent for a designated period of time and/or may establish other procedures to permit tracking of disqualifying dispositions of such shares. No Participant will have any voting, dividend, or other stockholder
rights with respect to shares of Common Stock subject to any option granted under the Plan until such shares have been purchased and delivered to the Participant as provided in this Section 9. 

10. Withdrawal. 
 (a) A
Participant may withdraw all but not less than all the Contributions credited to his or her account and not yet used to exercise his or her option under the Plan at any time by (i) submitting to the Company’s stock administration office
(or its designee) a written notice of withdrawal in the form determined by the Administrator for such purpose (which may be similar to the form attached hereto as Exhibit B), or (ii) following an electronic or other withdrawal procedure
determined by the Administrator. All of the Participant’s Contributions credited to his or her account will be paid to such Participant promptly after timely receipt of notice of withdrawal and such Participant’s option for the Offering
Period will be automatically terminated, and no further Contributions for the purchase of shares will be made for such Offering Period. If a Participant withdraws from an Offering Period, Contributions will not resume at the beginning of the
succeeding Offering Period, unless the Participant re-enrolls in the Plan in accordance with the provisions of Section 5. 

  
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 (b) A Participant’s withdrawal from an Offering Period will not have any effect upon his or
her eligibility to participate in any similar plan that may hereafter be adopted by the Company or in succeeding Offering Periods that commence after the termination of the Offering Period from which the Participant withdraws. 

11. Termination of Employment. Upon a Participant’s ceasing to be an Eligible Employee for any reason, he or she will be
deemed to have elected to withdraw from the Plan and the Contributions credited to such Participant’s account during the Offering Period but not yet used to purchase shares of Common Stock under the Plan will be returned to such Participant or,
in the case of his or her death, to the person or persons entitled thereto under Section 15, and such Participant’s option will be automatically terminated. A Participant whose employment transfers between entities through a termination
with an immediate rehire (with no break in service) by the Company or a Designated Company will not be treated as terminated under the Plan; however, if a Participant transfers from an Offering under the 423 Component to the Non-423 Component, the
exercise of the option will be qualified under the 423 Component only to the extent it complies with Section 423 of the Code. 
 12.
Interest. No interest will accrue on the Contributions of a participant in the Plan, except as may be required by Applicable Law, as determined by the Company, and if so required by the laws of a particular jurisdiction, will apply to all
Participants in the relevant Offering under the 423 Component, except to the extent otherwise permitted by U.S. Treasury Regulation Section 1.423-2(f). 

13. Stock. 
 (a) Subject
to adjustment upon changes in capitalization of the Company as provided in Section 19 hereof, the maximum number of shares of Common Stock that will be made available for sale under the Plan will be 750,000 shares of Common Stock. 

(b) Until the shares of Common Stock are issued (as evidenced by the appropriate entry on the books of the Company or of a duly authorized
transfer agent of the Company), a Participant will have only the rights of an unsecured creditor with respect to such shares, and no right to vote or receive dividends or any other rights as a stockholder will exist with respect to such shares. 

(c) Shares of Common Stock to be delivered to a Participant under the Plan will be registered in the name of the Participant or in the name of
the Participant and his or her spouse. 
 14. Administration. The Plan will be administered by the Board or a Committee appointed by
the Board, which Committee will be constituted to comply with Applicable Laws. The Administrator will have full and exclusive discretionary authority to construe, interpret and apply the terms of the Plan, to designate separate Offerings under the
Plan, to designate Subsidiaries and Affiliates as participating in the 423 Component or Non-423 Component, to determine eligibility, to adjudicate all disputed claims filed under the Plan and to establish such procedures that it deems necessary for
the administration of the Plan (including, without limitation, to adopt such procedures and sub-plans as are necessary or appropriate to permit the participation in the Plan by employees who are foreign nationals or employed outside the U.S., the
terms of which sub-plans may take precedence over other provisions of this Plan, with the exception of Section 13(a) hereof, but unless otherwise superseded by the terms of such sub-plan, the provisions of this Plan will govern the operation of
such sub-plan). Unless otherwise determined by the Administrator, the Employees eligible to participate in each sub-plan will participate in a separate Offering or in the Non-423 Component, unless such designation would cause the 423 Component to
violate the requirements of Section 423 of the Code. Without limiting the generality of the foregoing, the Administrator is specifically authorized to adopt rules and procedures regarding eligibility to participate, the definition of
Compensation, handling of Contributions, making of Contributions to the Plan (including, without limitation, in forms other than payroll deductions), establishment of bank or trust accounts to hold Contributions, payment of interest, conversion of
local currency, obligations to pay payroll tax, determination of beneficiary designation requirements, withholding procedures and handling of stock certificates 

  
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that vary with applicable local requirements. The Administrator also is authorized to determine that, to the extent permitted by U.S. Treasury Regulation
Section 1.423-2(f), the terms of an option granted under the Plan or an Offering to citizens or residents of a non-U.S. jurisdiction will be less favorable than the terms of options granted under the Plan
or the same Offering to employees resident solely in the U.S. Every finding, decision and determination made by the Administrator will, to the full extent permitted by law, be final and binding upon all parties. 

15. Designation of Beneficiary. 

(a) If permitted by the Administrator, a Participant may file a designation of a beneficiary who is to receive any shares of Common Stock and
cash, if any, from the Participant’s account under the Plan in the event of such Participant’s death subsequent to an Exercise Date on which the option is exercised but prior to delivery to such Participant of such shares and cash. In
addition, if permitted by the Administrator, a Participant may file a designation of a beneficiary who is to receive any cash from the Participant’s account under the Plan in the event of such Participant’s death prior to exercise of the
option. If a Participant is married and the designated beneficiary is not the spouse, spousal consent will be required for such designation to be effective. 

(b) Such designation of beneficiary may be changed by the Participant at any time by notice in a form determined by the Administrator. In the
event of the death of a Participant and in the absence of a beneficiary validly designated under the Plan who is living at the time of such Participant’s death, the Company will deliver such shares and/or cash to the executor or administrator
of the estate of the Participant, or if no such executor or administrator has been appointed (to the knowledge of the Company), the Company, in its discretion, may deliver such shares and/or cash to the spouse or to any one or more dependents or
relatives of the Participant, or if no spouse, dependent or relative is known to the Company, then to such other person as the Company may designate. 

(c) All beneficiary designations will be in such form and manner as the Administrator may designate from time to time. Notwithstanding
Sections 15(a) and (b) above, the Company and/or the Administrator may decide not to permit such designations by Participants in non-U.S. jurisdictions to the extent permitted by U.S. Treasury Regulation
Section 1.423-2(f). 
 16. Transferability. Neither Contributions credited to a
Participant’s account nor any rights with regard to the exercise of an option or to receive shares of Common Stock under the Plan may be assigned, transferred, pledged or otherwise disposed of in any way (other than by will, the laws of descent
and distribution or as provided in Section 15 hereof) by the Participant. Any such attempt at assignment, transfer, pledge or other disposition will be without effect, except that the Company may treat such act as an election to withdraw funds
from an Offering Period in accordance with Section 10 hereof. 
 17. Use of Funds. The Company may use all Contributions
received or held by it under the Plan for any corporate purpose, and the Company will not be obligated to segregate such Contributions except under Offerings or for Participants in the Non-423 Component for which Applicable Laws require that
Contributions to the Plan by Participants be segregated from the Company’s general corporate funds and/or deposited with an independent third party. Until shares of Common Stock are issued, Participants will have only the rights of an unsecured
creditor with respect to such shares. 
 18. Reports. Individual accounts will be maintained for each Participant in the Plan.
Statements of account will be given to participating Eligible Employees at least annually, which statements will set forth the amounts of Contributions, the Purchase Price, the number of shares of Common Stock purchased and the remaining cash
balance, if any. 

  
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 19. Adjustments, Dissolution, Liquidation, Merger or Change in Control. 

(a) Adjustments. In the event that any dividend or other distribution (whether in the form of cash, Common Stock, other securities, or
other property), recapitalization, stock split, reverse stock split, reorganization, merger, consolidation, split-up, spin-off, combination, repurchase, or exchange of Common Stock or other securities of the Company, or other change in the corporate
structure of the Company affecting the Common Stock occurs, the Administrator, in order to prevent dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan, will, in such manner as it may deem
equitable, adjust the number and class of Common Stock that may be delivered under the Plan, the Purchase Price per share and the number of shares of Common Stock covered by each option under the Plan that has not yet been exercised, and the
numerical limits of Sections 7 and 13. 
 (b) Dissolution or Liquidation. In the event of the proposed dissolution or liquidation of
the Company, any Offering Period then in progress will be shortened by setting a New Exercise Date, and will terminate immediately prior to the consummation of such proposed dissolution or liquidation, unless provided otherwise by the Administrator.
The New Exercise Date will be before the date of the Company’s proposed dissolution or liquidation. The Administrator will notify each Participant in writing or electronically, prior to the New Exercise Date, that the Exercise Date for the
Participant’s option has been changed to the New Exercise Date and that the Participant’s option will be exercised automatically on the New Exercise Date, unless prior to such date the Participant has withdrawn from the Offering Period as
provided in Section 10 hereof. 
 (c) Merger or Change in Control. In the event of a merger or Change in Control, each
outstanding option will be assumed or an equivalent option substituted by the successor corporation or a Parent or Subsidiary of the successor corporation. In the event that the successor corporation refuses to assume or substitute for the option,
the Offering Period with respect to which such option relates will be shortened by setting a New Exercise Date on which such Offering Period will end. The New Exercise Date will occur before the date of the Company’s proposed merger or Change
in Control. The Administrator will notify each Participant in writing or electronically prior to the New Exercise Date, that the Exercise Date for the Participant’s option has been changed to the New Exercise Date and that the
Participant’s option will be exercised automatically on the New Exercise Date, unless prior to such date the Participant has withdrawn from the Offering Period as provided in Section 10 hereof. 

20. Amendment or Termination. 

(a) The Administrator, in its sole discretion, may amend, suspend or terminate the Plan, or any part thereof, at any time and for any reason.
If the Plan is terminated, the Administrator, in its discretion, may elect to terminate all outstanding Offering Periods either immediately or upon completion of the purchase of shares of Common Stock on the next Exercise Date (which may be sooner
than originally scheduled, if determined by the Administrator in its discretion), or may elect to permit Offering Periods to expire in accordance with their terms (and subject to any adjustment pursuant to Section 19). If the Offering Periods
are terminated prior to expiration, all amounts then credited to Participants’ accounts that have not been used to purchase shares of Common Stock will be returned to the Participants (without interest thereon, except as otherwise
required under Applicable Laws, as further set forth in Section 12 hereof) as soon as administratively practicable. 
 (b) Without
stockholder consent and without limiting Section 20(a), the Administrator will be entitled to change the Offering Periods or Purchase Periods, designate separate Offerings, limit the frequency and/or number of changes in the amount withheld
during an Offering Period, establish the exchange ratio applicable to amounts withheld in a currency other than U.S. dollars, permit Contributions in excess of the amount designated by a Participant in order to adjust for delays or mistakes in the
Company’s processing of properly completed Contribution elections, establish reasonable waiting and adjustment periods and/or accounting and crediting procedures to ensure that amounts applied toward the purchase of Common Stock for each
Participant properly correspond with Contribution amounts, and establish such other limitations or procedures as the Administrator determines in its sole discretion advisable that are consistent with the Plan. 

  
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 (c) In the event the Administrator determines that the ongoing operation of the Plan may result
in unfavorable financial accounting consequences, the Administrator may, in its discretion and, to the extent necessary or desirable, modify, amend or terminate the Plan to reduce or eliminate such accounting consequence including, but not limited
to: 
 (i) amending the Plan to conform with the safe harbor definition under the Financial Accounting Standards Board Accounting Standards
Codification Topic 718 (or any successor thereto), including with respect to an Offering Period underway at the time; 
 (ii) altering the
Purchase Price for any Offering Period or Purchase Period including an Offering Period or Purchase Period underway at the time of the change in Purchase Price; 

(iii) shortening any Offering Period or Purchase Period by setting a New Exercise Date, including an Offering Period or Purchase Period
underway at the time of the Administrator action; 
 (iv) reducing the maximum percentage of Compensation a Participant may elect to set
aside as Contributions; and 
 (v) reducing the maximum number of Shares a Participant may purchase during any Offering Period or Purchase
Period. 
 Such modifications or amendments will not require stockholder approval or the consent of any Participants. 

21. Notices. All notices or other communications by a Participant to the Company under or in connection with the Plan will be deemed to
have been duly given when received in the form and manner specified by the Company at the location, or by the person, designated by the Company for the receipt thereof. 

22. Conditions Upon Issuance of Shares. Shares of Common Stock will not be issued with respect to an option unless the exercise of such
option and the issuance and delivery of such shares pursuant thereto will comply with all applicable provisions of law, domestic or foreign, including, without limitation, the U.S. Securities Act of 1933, as amended, the Exchange Act, the rules and
regulations promulgated thereunder, and the requirements of any stock exchange upon which the shares may then be listed, and will be further subject to the approval of counsel for the Company with respect to such compliance. 

As a condition to the exercise of an option, the Company may require the person exercising such option to represent and warrant at the time of
any such exercise that the shares are being purchased only for investment and without any present intention to sell or distribute such shares if, in the opinion of counsel for the Company, such a representation is required by any of the
aforementioned applicable provisions of law. 
 23. Code Section 409A. The 423 Component of the Plan is exempt from the
application of Code Section 409A and any ambiguities herein will be interpreted to so be exempt from Code Section 409A. In furtherance of the foregoing and notwithstanding any provision in the Plan to the contrary, if the Administrator
determines that an option granted under the Plan may be subject to Code Section 409A or that any provision in the Plan would cause an option under the Plan to be subject to Code Section 409A, the Administrator may amend the terms of the
Plan and/or of an outstanding option granted under the Plan, or take such other action the Administrator determines is necessary or appropriate, in each case, without the Participant’s consent, to exempt any outstanding option or future option
that may be granted under the Plan from or to allow any such options to comply with Code Section 409A, but only to the extent any such amendments or action by the Administrator would not violate Code Section 409A. Notwithstanding the
foregoing, the Company will have no liability to a Participant or any other party if the option to purchase Common Stock under the Plan that is intended to be exempt from or compliant with Code Section 409A is not so exempt or compliant or for
any action taken by the Administrator with respect thereto. The Company makes no representation that the option to purchase Common Stock under the Plan is compliant with Code Section 409A. 

  
 11 








 24. Term of Plan. The Plan will become effective upon the earlier to occur of its adoption
by the Board or its approval by the stockholders of the Company. It will continue in effect for a term of 20 years, unless sooner terminated under Section 20. 

25. Stockholder Approval. The Plan will be subject to approval by the stockholders of the Company within 12 months after the date the
Plan is adopted by the Board. Such stockholder approval will be obtained in the manner and to the degree required under Applicable Laws. 

26. Governing Law. The Plan will be governed by, and construed in accordance with, the laws of the State of California (except its
choice-of-law provisions). 
 27. No Right to Employment. Participation in the Plan by a Participant will not be construed as giving
a Participant the right to be retained as an employee of the Company or a Subsidiary or Affiliate, as applicable. Furthermore, the Company or a Subsidiary or Affiliate may dismiss a Participant from employment at any time, free from any liability or
any claim under the Plan. 
 28. Severability. If any provision of the Plan is or becomes or is deemed to be invalid, illegal, or
unenforceable for any reason in any jurisdiction or as to any Participant, such invalidity, illegality or unenforceability will not affect the remaining parts of the Plan, and the Plan will be construed and enforced as to such jurisdiction or
Participant as if the invalid, illegal or unenforceable provision had not been included. 
 29. Compliance with Applicable Laws. The
terms of this Plan are intended to comply with all Applicable Laws and will be construed accordingly. 

  
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 EXHIBIT A 

BARRACUDA NETWORKS, INC. 

2015 EMPLOYEE STOCK PURCHASE PLAN 

SUBSCRIPTION AGREEMENT (U.S. PARTICIPANTS) 
  

			
	             Original Application	 	Offering Date:
                                         
       
	             Change in Payroll Deduction Rate	 	

 1.
                                         
    hereby elects to participate in the Barracuda Networks, Inc. 2015 Employee Stock Purchase Plan (the “Plan”) and subscribes to purchase shares of the Company’s Common Stock in accordance with this
Subscription Agreement and the Plan. 
 2. I hereby authorize payroll deductions from each paycheck in the amount of
            % of my Compensation on each payday (from 0 to 10%) during the Offering Period in accordance with the Plan. (Please note that no fractional percentages are permitted.)

 3. I understand that said payroll deductions will be accumulated for the purchase of shares of Common Stock at the applicable Purchase
Price determined in accordance with the Plan. I understand that if I do not withdraw from an Offering Period, any accumulated payroll deductions will be used to automatically exercise my option and purchase Common Stock under the Plan. 

4. I have received a copy of the complete Plan and its accompanying prospectus. I understand that my participation in the Plan is in all
respects subject to the terms of the Plan. 
 5. Shares of Common Stock purchased for me under the Plan should be issued in the name(s) of
                                        
(Eligible Employee or Eligible Employee and Spouse only). 
 6. I understand that if I dispose of any shares received by me pursuant to the
Plan within two years after the Offering Date (the first day of the Offering Period during which I purchased such shares) or one year after the Exercise Date, I will be treated for federal income tax purposes as having received ordinary
income at the time of such disposition in an amount equal to the excess of the fair market value of the shares at the time such shares were purchased by me over the price that I paid for the shares. I hereby agree to notify the Company in writing
within 30 days after the date of any disposition of my shares and I will make adequate provision for federal, state or other tax withholding obligations, if any, which arise upon the disposition of the Common Stock. The Company may, but will not
be obligated to, withhold from my compensation the amount necessary to meet any applicable withholding obligation including any withholding necessary to make available to the Company any tax deductions or benefits


  
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attributable to sale or early disposition of Common Stock by me. If I dispose of such shares at any time after the expiration of the two-year and one-year holding periods, I understand that I
will be treated for federal income tax purposes as having received income only at the time of such disposition, and that such income will be taxed as ordinary income only to the extent of an amount equal to the lesser of (a) the excess of the
fair market value of the shares at the time of such disposition over the purchase price which I paid for the shares, or (b) 15% of the fair market value of the shares on the first day of the Offering Period. The remainder of the gain, if any,
recognized on such disposition will be taxed as capital gain. 
 7. I hereby agree to be bound by the terms of the Plan. The effectiveness
of this Subscription Agreement is dependent upon my eligibility to participate in the Plan. 
  

											
		 	Employee’s Social	 		 		 		  	
		 	Security Number:	 		 	  

		 		 		 		 		  	
		 	Employee’s Address:	 		 	  

		 		 		 	  
  

		 		 		 	  
  


 I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT WILL REMAIN IN EFFECT THROUGHOUT SUCCESSIVE OFFERING PERIODS
UNLESS TERMINATED BY ME. 
  

			
	Dated:
                                         
           	 	Signature of Employee                                 
                


  
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 EXHIBIT B 

BARRACUDA NETWORKS, INC. 

2015 EMPLOYEE STOCK PURCHASE PLAN 

NOTICE OF WITHDRAWAL 
 The
undersigned Participant in the Offering Period of the Barracuda Networks, Inc. 2015 Employee Stock Purchase Plan that began on
                    ,              (the “Offering Date”)
hereby notifies the Company that he or she hereby withdraws from the Offering Period. He or she hereby directs the Company to pay to the undersigned as promptly as practicable all the payroll deductions credited to his or her account with respect to
such Offering Period. The undersigned understands and agrees that his or her option for such Offering Period will be terminated automatically. The undersigned understands further that no further payroll deductions will be made for the purchase of
shares in the current Offering Period and the undersigned will be eligible to participate in succeeding Offering Periods only by delivering to the Company a new Subscription Agreement. 

 

	
	Name and Address of Participant:
	
	 
	
	 
	
	 


  

			
	Signature:
	
	 
		
	Date:	 	 



  
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