Document:

Stock Purchase Agreement,(1,265,730 shares of common stock purchased)

 Exhibit 10.9 
 IMPERVA, INC. 
 SUMMARY
OF STOCK PURCHASE (WITH ACCELERATION) 
 The Purchaser is
acquiring shares of the Common Stock of Imperva, Inc. on the following terms: 
  

			
	Name of Purchaser:	 	Shlomo Kramer
		
	Total Number of Purchased Shares:	 	1,265,730
		
	Purchase Price per Share:	 	$1.65
		
	Date of Offer:	 	September 30, 2010
		
	Date of Purchase:	 	September 30, 2010
		
	Vesting Commencement Date:	 	May 1, 2010
		
	Vesting Schedule:	 	The Right of Repurchase shall lapse with respect to the first 25% of the Purchased Shares when the Purchaser completes 12 months of continuous Service after the Vesting
Commencement Date set forth above. The Right of Repurchase shall lapse with respect to an additional 6.25% of the Purchased Shares when the Purchaser completes each three-month period of continuous Service thereafter. In addition, if the Company is
subject to a Change in Control before the Purchaser’s Service terminates, then the Right of Repurchase shall lapse with respect to 50% of the remaining unvested Shares. If the Company is subject to a Change in Control before the
Purchaser’s service with the Company terminates and if the Purchaser is subject to an Involuntary Termination within 12 months after such Change in Control, then the Right of Repurchase shall lapse with respect to all of the remaining unvested
Shares.

 The Purchase Price must be paid on or before the Date of Purchase set forth above. If the Purchaser fails to make
payment before the Date of Purchase, this offer automatically terminates. 
 By signing below, the Purchaser and the Company agree that the
acquisition of the Purchased Shares is governed by the terms and conditions of the Stock Purchase Agreement. The Stock Purchase Agreement is attached to, and made a part of, this Summary of Stock Purchase. The Purchaser further agrees that the
Company may deliver by email all documents relating to this purchase and all other documents that the Company is required to deliver to its security holders (including, without limitation, disclosures that may be required by the Securities and
Exchange Commission). The Purchaser also agrees that the Company may deliver these documents by posting them on a website maintained by the Company or by a third party under contract with the Company. If the Company posts these documents on a
website, it shall notify the Purchaser by email. 
  

							
	PURCHASER:	 		  	IMPERVA, INC.
				
		 		  		 	 /s/ Aviv Shoham

	 /s/ Shlomo Kramer
	 		  	By:	 	 Aviv Shoham

	Shlomo Kramer	 		  	Title:	 	 VP Finance

 IMPERVA, INC. 

STOCK PURCHASE AGREEMENT 
 SECTION 1. ACQUISITION OF SHARES. 
 (a) Transfer. On the terms and
conditions set forth in the Summary of Stock Purchase and this Agreement, the Company agrees to transfer to the Purchaser the number of Shares set forth in the Summary of Stock Purchase. The transfer shall occur at the offices of the Company on the
date of purchase set forth in the Summary of Stock Purchase or at such other place and time as the parties may agree. 
 (b)
Consideration. The Purchaser agrees to pay the Purchase Price set forth in the Summary of Stock Purchase for each Purchased Share. Payment shall be made in cash or cash equivalents on the date of purchase set forth in the Summary of Stock
Purchase. 
 (c) Withholding Taxes. The Purchaser, as a condition to the transfer of the Purchased Shares, shall make
arrangements satisfactory to the Company to enable it to satisfy all federal and state tax withholding requirements. 
 (d)
Defined Terms. Capitalized terms are defined in Section 12 of this Agreement. 
 SECTION 2. RIGHT OF REPURCHASE. 

(a) Scope of Repurchase Right. Until they vest in accordance with the Summary of Stock Purchase and Subsection (b) below, the
Purchased Shares shall be Restricted Shares and shall be subject to the Company’s Right of Repurchase. The Company, however, may decline to exercise its Right of Repurchase or may exercise its Right of Repurchase only with respect to a portion
of the Restricted Shares. The Company may exercise its Right of Repurchase only during the Repurchase Period following the termination of the Purchaser’s Service. The Right of Repurchase may be exercised automatically under Subsection (d)
below. If the Right of Repurchase is exercised, the Company shall pay the Purchaser an amount equal to the Purchase Price for each of the Restricted Shares being repurchased. 
 (b) Lapse of Repurchase Right. The Right of Repurchase shall lapse with respect to the Restricted Shares in accordance with the vesting schedule set forth in the Summary of Stock Purchase. In
addition, if the Company is subject to a Change in Control before the Purchaser’s Service terminates, then the Right of Repurchase shall lapse with respect to 50% of the remaining Restricted Shares. If the Company is subject to a Change in
Control before the Purchaser’s service with the Company terminates and if the Purchaser is subject to an Involuntary Termination within 12 months after such Change in Control, then the Right of Repurchase shall lapse with respect to all of the
remaining Restricted Shares. 

  
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 (c) Escrow. Upon issuance, the certificate(s) for Restricted Shares shall be
deposited in escrow with the Company to be held in accordance with the provisions of this Agreement. Any additional or exchanged securities or other property described in Subsection (f) below shall immediately be delivered to the Company to be
held in escrow. All ordinary cash dividends on Restricted Shares (or on other securities held in escrow) shall be paid directly to the Purchaser and shall not be held in escrow. Restricted Shares, together with any other assets held in escrow under
this Agreement, shall be (i) surrendered to the Company for repurchase upon exercise of the Right of Repurchase or the Right of First Refusal or (ii) released to the Purchaser upon his or her request to the extent that the Shares have
ceased to be Restricted Shares (but not more frequently than once every six months). In any event, all Purchased Shares that have ceased to be Restricted Shares, together with any other vested assets held in escrow under this Agreement, shall be
released within 90 days after the earlier of (i) the termination of the Purchaser’s Service or (ii) the lapse of the Right of First Refusal. 
 (d) Exercise of Repurchase Right. The Company shall be deemed to have exercised its Right of Repurchase automatically for all Restricted Shares as of the commencement of the Repurchase Period,
unless the Company during the Repurchase Period notifies the holder of the Restricted Shares pursuant to Section 9 that it will not exercise its Right of Repurchase for some or all of the Restricted Shares. During the Repurchase Period, the
Company shall pay to the holder of the Restricted Shares the purchase price determined under Subsection (a) above for the Restricted Shares being repurchased. Payment shall be made in cash or cash equivalents and/or by canceling indebtedness to
the Company incurred by the Purchaser in the purchase of the Restricted Shares. The certificate(s) representing the Restricted Shares being repurchased shall be delivered to the Company. 

(e) Termination of Rights as Stockholder. If the Right of Repurchase is exercised in accordance with this Section 2 and the
Company makes available the consideration for the Restricted Shares being repurchased, then the person from whom the Restricted Shares are repurchased shall no longer have any rights as a holder of the Restricted Shares (other than the right to
receive payment of such consideration). Such Restricted Shares shall be deemed to have been repurchased pursuant to this Section 2, whether or not the certificate(s) for such Restricted Shares have been delivered to the Company or the
consideration for such Restricted Shares has been accepted. 
 (f) Additional or Exchanged Securities and Property. In
the event of a merger or consolidation of the Company with or into another entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than
stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of such
transaction exchanged for, or distributed with respect to, any Restricted Shares shall immediately be subject to the Right of Repurchase. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made to
the number and/or class of the Restricted Shares. Appropriate adjustments shall also be made to the price per share to be paid upon the exercise of the Right of Repurchase, provided that the aggregate purchase price payable for the Restricted Shares
shall remain the same. In the event of a merger or 

  
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consolidation of the Company with or into another entity or any other corporate reorganization, the Right of Repurchase may be exercised by the Company’s successor. 

(g) Transfer of Restricted Shares. The Purchaser shall not transfer, assign, encumber or otherwise dispose of any Restricted
Shares without the Company’s written consent, except as provided in the following sentence. The Purchaser may transfer Restricted Shares to one or more members of the Purchaser’s Immediate Family or to a trust established by the Purchaser
for the benefit of the Purchaser and/or one or more members of the Purchaser’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by all provisions of this Agreement.
If the Purchaser transfers any Restricted Shares, then this Agreement shall apply to the Transferee to the same extent as to the Purchaser. 
 (h) Assignment of Repurchase Right. The Board of Directors may freely assign the Company’s Right of Repurchase, in whole or in part. Any person who accepts an assignment of the Right of
Repurchase from the Company shall assume all of the Company’s rights and obligations under this Section 2. 
 (i)
Part-Time Employment and Leaves of Absence. If the Purchaser commences working on a part-time basis, then the Company may adjust the vesting schedule set forth in the Summary of Stock Purchase in accordance with the Company’s part-time
work policy or the terms of an agreement between the Purchaser and the Company pertaining to his or her part-time schedule. If the Purchaser goes on a leave of absence, then the Company may adjust the vesting schedule set forth in the Summary of
Stock Purchase in accordance with the Company’s leave of absence policy or the terms of such leave. Except as provided in the preceding sentence, Service shall be deemed to continue while the Purchaser is on a bona fide leave of absence,
if (i) such leave was approved by the Company in writing and (ii) continued crediting of Service is expressly required by the terms of such leave or by applicable law (as determined by the Company). Service shall be deemed to terminate
when such leave ends, unless the Purchaser immediately returns to active work. 
 SECTION 3. RIGHT OF FIRST REFUSAL. 

(a) Right of First Refusal. In the event that the Purchaser proposes to sell, pledge or otherwise transfer to a third party any
Purchased Shares, or any interest in Purchased Shares, the Company shall have the Right of First Refusal with respect to all (and not less than all) of such Purchased Shares. If the Purchaser desires to transfer Purchased Shares, the Purchaser shall
give a written Transfer Notice to the Company describing fully the proposed transfer, including the number of Purchased Shares proposed to be transferred, the proposed transfer price, the name and address of the proposed Transferee and proof
satisfactory to the Company that the proposed sale or transfer will not violate any applicable federal, State or foreign securities laws. The Transfer Notice shall be signed both by the Purchaser and by the proposed Transferee and must constitute a
binding commitment of both parties to the transfer of the Purchased Shares. The Company shall have the right to purchase all, and not less than all, of the Purchased Shares on the terms of the proposal described in the Transfer Notice (subject,
however, to any change in such terms permitted under Subsection (b) below) by delivery of a 

  
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notice of exercise of the Right of First Refusal within 30 days after the date when the Transfer Notice was received by the Company. 

(b) Transfer of Shares. If the Company fails to exercise its Right of First Refusal within 30 days after receiving the
Transfer Notice, the Purchaser may, not later than 90 days after the Company received the Transfer Notice, conclude a transfer of the Purchased Shares subject to the Transfer Notice on the terms and conditions described in the Transfer Notice,
provided that any such sale is made in compliance with applicable federal, State and foreign securities laws and not in violation of any other contractual restrictions to which the Purchaser is bound. Any proposed transfer on terms and conditions
different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Purchaser, shall again be subject to the Right of First Refusal and shall require compliance with the procedure described in
Subsection (a) above. If the Company exercises its Right of First Refusal, the parties shall consummate the sale of the Purchased Shares on the terms set forth in the Transfer Notice within 60 days after the Company received the Transfer
Notice (or within such longer period as may have been specified in the Transfer Notice); provided, however, that in the event the Transfer Notice provided that payment for the Purchased Shares was to be made in a form other than cash or cash
equivalents paid at the time of transfer, the Company shall have the option of paying for the Purchased Shares with cash or cash equivalents equal to the present value of the consideration described in the Transfer Notice. 

(c) Additional or Exchanged Securities and Property. In the event of a merger or consolidation of the Company with or into another
entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a
similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of such transaction exchanged for, or distributed with respect to, any Purchased Shares
subject to this Section 3 shall immediately be subject to the Right of First Refusal. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made to the number and/or class of the Purchased
Shares subject to this Section 3. 
 (d) Termination of Right of First Refusal. Any other provision of this
Section 3 notwithstanding, in the event that the Stock is readily tradable on an established securities market when the Purchaser desires to transfer Purchased Shares, the Company shall have no Right of First Refusal, and the Purchaser shall
have no obligation to comply with the procedures prescribed by Subsections (a) and (b) above. 
 (e) Permitted
Transfers. This Section 3 shall not apply to (i) a transfer by beneficiary designation, will or intestate succession or (ii) a transfer to one or more members of the Purchaser’s Immediate Family or to a trust or other entity
established by the Purchaser for the benefit of the Purchaser and/or one or more members of the Purchaser’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by all
provisions of this Agreement. If the Purchaser transfers any Purchased Shares, either under this Subsection (e) or after the Company has failed to exercise the Right of First Refusal, then this Agreement shall apply to the Transferee to the
same extent as to the Purchaser. 

  
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 (f) Termination of Rights as Stockholder. If the Company makes available, at the time
and place and in the amount and form provided in this Agreement, the consideration for the Shares to be purchased in accordance with this Section 3, then after such time the person from whom such Shares are to be purchased shall no longer have
any rights as a holder of such Shares (other than the right to receive payment of such consideration in accordance with this Agreement). Such Shares shall be deemed to have been purchased in accordance with the applicable provisions hereof, whether
or not the certificate(s) therefor have been delivered as required by this Agreement. 
 (g) Assignment of Right of First
Refusal. The Board of Directors may freely assign the Company’s Right of First Refusal, in whole or in part. Any person who accepts an assignment of the Right of First Refusal from the Company shall assume all of the Company’s rights
and obligations under this Section 3. 
 SECTION 4. OTHER RESTRICTIONS ON TRANSFER. 

(a) Purchaser Representations. In connection with the issuance and acquisition of Shares under this Agreement, the Purchaser hereby
represents and warrants to the Company as follows: 
 (i) The Purchaser is acquiring and will hold the Purchased
Shares for investment for his or her account only and not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act. 

(ii) The Purchaser understands that the Purchased Shares have not been registered under the Securities Act by reason of a
specific exemption therefrom and that the Purchased Shares must be held indefinitely, unless they are subsequently registered under the Securities Act or the Purchaser obtains an opinion of counsel, in form and substance satisfactory to the Company
and its counsel, that such registration is not required. The Purchaser further acknowledges and understands that the Company is under no obligation to register the Purchased Shares. 

(iii) The Purchaser is aware of the adoption of Rule 144 by the Securities and Exchange Commission under the
Securities Act, which permits limited public resales of securities acquired in a non-public offering, subject to the satisfaction of certain conditions, including (without limitation) the availability of certain current public information about the
issuer, the resale occurring only after the holding period required by Rule 144 has been satisfied, the sale occurring through an unsolicited “broker’s transaction,” and the amount of securities being sold during any three-month
period not exceeding specified limitations. The Purchaser acknowledges and understands that the conditions for resale set forth in Rule 144 have not been satisfied and that the Company has no plans to satisfy these conditions in the foreseeable
future. 

  
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 (iv) The Purchaser will not sell, transfer or otherwise dispose of the
Purchased Shares in violation of the Securities Act, the Securities Exchange Act of 1934, or the rules promulgated thereunder, including Rule 144 under the Securities Act. The Purchaser agrees that he or she will not dispose of the Purchased
Shares unless and until he or she has complied with all requirements of this Agreement applicable to the disposition of Purchased Shares and he or she has provided the Company with written assurances, in substance and form satisfactory to the
Company, that (A) the proposed disposition does not require registration of the Purchased Shares under the Securities Act or all appropriate action necessary for compliance with the registration requirements of the Securities Act or with any
exemption from registration available under the Securities Act (including Rule 144) has been taken and (B) the proposed disposition will not result in the contravention of any transfer restrictions applicable to the Purchased Shares under
the securities laws or regulations of any State. 
 (v) The Purchaser has been furnished with, and has had access
to, such information as he or she considers necessary or appropriate for deciding whether to invest in the Purchased Shares, and the Purchaser has had an opportunity to ask questions and receive answers from the Company regarding the terms and
conditions of the issuance of the Purchased Shares. 
 (vi) The Purchaser is aware that his or her investment in
the Company is a speculative investment that has limited liquidity and is subject to the risk of complete loss. The Purchaser is able, without impairing his or her financial condition, to hold the Purchased Shares for an indefinite period and to
suffer a complete loss of his or her investment in the Purchased Shares. 
 (b) Securities Law Restrictions. Regardless
of whether the offering and sale of Shares under this Agreement have been registered under the Securities Act or have been registered or qualified under the securities laws of any State, the Company at its discretion may impose restrictions upon the
sale, pledge or other transfer of the Purchased Shares (including the placement of appropriate legends on stock certificates or the imposition of stop-transfer instructions) if, in the judgment of the Company, such restrictions are necessary or
desirable in order to achieve compliance with the Securities Act, the securities laws of any State or any other law. 
 (c)
Market Stand-Off. In connection with any underwritten public offering by the Company of its equity securities pursuant to an effective registration statement filed under the Securities Act, including the Company’s initial public
offering, the Purchaser or a Transferee shall not directly or indirectly sell, make any short sale of, loan, hypothecate, pledge, offer, grant or sell any option or other contract for the purchase of, purchase any option or other contract for the
sale of, or otherwise dispose of or transfer, or agree to engage in any of the foregoing transactions with respect to, any Purchased Shares without the prior written consent of the Company or its managing underwriter. Such restriction (the
“Market Stand-Off”) shall be in effect for such period of time following the date of the final prospectus for the offering as may be requested by the Company or such underwriter. In no event, however, shall such period exceed

  
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180 days plus such additional period as may reasonably be requested by the Company or such underwriter to accommodate regulatory restrictions on (i) the publication or other distribution of
research reports or (ii) analyst recommendations and opinions, including (without limitation) the restrictions set forth in Rule 2711(f)(4) of the National Association of Securities Dealers and Rule 472(f)(4) of the New York Stock
Exchange, as amended, or any similar successor rules. The Market Stand-Off shall in any event terminate two years after the date of the Company’s initial public offering. In the event of the declaration of a stock dividend, a spin-off, a stock
split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities without receipt of consideration, any new, substituted or additional securities which are by reason of such
transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares thereby become convertible, shall immediately be subject to the Market Stand-Off. In order to enforce the Market Stand-Off, the Company may
impose stop-transfer instructions with respect to the Purchased Shares until the end of the applicable stand-off period. The Company’s underwriters shall be beneficiaries of the agreement set forth in this Subsection (c). This
Subsection (c) shall not apply to Shares registered in the public offering under the Securities Act. 
 (d) Rights of
the Company. The Company shall not be required to (i) transfer on its books any Purchased Shares that have been sold or transferred in contravention of this Agreement or (ii) treat as the owner of Purchased Shares, or otherwise to
accord voting, dividend or liquidation rights to, any transferee to whom Purchased Shares have been transferred in contravention of this Agreement. 
 SECTION 5. SUCCESSORS AND ASSIGNS. 
 Except as otherwise expressly provided
to the contrary, the provisions of this Agreement shall inure to the benefit of, and be binding upon, the Company and its successors and assigns and be binding upon the Purchaser and the Purchaser’s legal representatives, heirs, legatees,
distributees, assigns and transferees by operation of law, whether or not any such person has become a party to this Agreement or has agreed in writing to join herein and to be bound by the terms, conditions and restrictions hereof. 

SECTION 6. EMPLOYMENT AT WILL. 
 The Purchaser’s employment with the Company shall be “at will,” meaning that either the Purchaser or the Company shall be entitled to terminate the Purchaser’s employment at any time
and for any reason, with or without Cause. Nothing in this Agreement shall confer upon the Purchaser any right to continue in Service for any period of specific duration. Any contrary representations that may have been made to the Purchaser shall be
superseded by this Agreement. This Agreement shall constitute the full and complete agreement between the Purchaser and the Company on the “at will” nature of the Purchaser’s employment, which may only be changed in an express written
agreement signed by the Purchaser and a duly authorized officer of the Company (other than the Purchaser). 

  
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 SECTION 7. TAX ELECTION. 
 The acquisition of the Purchased Shares may result in adverse tax consequences that may be avoided or mitigated by filing an election under Code Section 83(b). Such election may be filed only within
30 days after the date of purchase set forth in the Summary of Stock Purchase. The form for making the Code Section 83(b) election is attached to this Agreement as an Exhibit. The Purchaser should consult with his or her tax advisor to
determine the tax consequences of acquiring the Purchased Shares and the advantages and disadvantages of filing the Code Section 83(b) election. The Purchaser acknowledges that it is his or her sole responsibility, and not the Company’s,
to file a timely election under Code Section 83(b), even if the Purchaser requests the Company or its representatives to make this filing on his or her behalf. 
 SECTION 8. LEGENDS. 
 All certificates evidencing Purchased Shares shall
bear the following legends: 
 “THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, ENCUMBERED OR IN ANY
MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY CERTAIN RIGHTS OF FIRST
REFUSAL UPON AN ATTEMPTED TRANSFER OF THE SHARES AND CERTAIN REPURCHASE RIGHTS UPON TERMINATION OF SERVICE WITH THE COMPANY. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE HOLDER HEREOF WITHOUT
CHARGE.” 
 “THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND
MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.” 

If required by the authorities of any State in connection with the issuance of the Purchased Shares, the legend or legends required by such State
authorities shall also be endorsed on all such certificates. 
 SECTION 9. NOTICE. 

Any notice required by the terms of this Agreement shall be given in writing. It shall be deemed effective upon (i) personal
delivery, (ii) deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid or (iii) deposit with Federal Express Corporation, with shipping charges prepaid. Notice shall be addressed to the

  
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Company at its principal executive office and to the Purchaser at the address that he or she most recently provided to the Company in accordance with this Section 9. 

SECTION 10. ENTIRE AGREEMENT. 
 The Summary of Stock Purchase and this Agreement constitute the entire contract between the parties hereto with regard to the subject matter hereof. They supersede any other agreements, representations or
understandings (whether oral or written and whether express or implied) that relate to the subject matter hereof. The Purchaser acknowledges that the grant of the right to acquire the Purchased Shares fully satisfies the Company’s obligation to
the Purchaser with respect to the grant of equity. The Purchaser further acknowledges that any additional grant of equity to the Purchaser will occur only to the extent it is approved by the Board of Directors, at its sole discretion. 

SECTION 11. CHOICE OF LAW. 
 This Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, as such laws are applied to contracts entered into and performed in such State. 

SECTION 12. DEFINITIONS. 

(a) “Agreement” shall mean this Stock Purchase Agreement. 

(b) “Board of Directors” shall mean the Board of Directors of the Company, as constituted from time to time.

 (c) “Cause” shall mean: 

(i) An unauthorized use or disclosure by the Purchaser of the Company’s confidential information or trade secrets,
which use or disclosure causes material harm to the Company; 
 (ii) A material breach by the Purchaser of any
agreement between the Purchaser and the Company; 
 (iii) A material failure by the Purchaser to comply with the
Company’s written policies or rules; 
 (iv) The Purchaser’s conviction of, or plea of
“guilty” or “no contest” to, a felony under the laws of the United States or any State thereof; 
 (v) The Purchaser’s gross negligence or willful misconduct; 

(vi) A continuing failure by the Purchaser to perform assigned duties after receiving written notification of such failure
from the Board of Directors; or 

  
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 (vii) A failure by the Purchaser to cooperate in good faith with a
governmental or internal investigation of the Company or its directors, officers or employees, if the Company has requested the Purchaser’s cooperation. 
 (d) “Change in Control” shall mean a “Liquidation Event,” as defined in the Company’s Certificate of Incorporation, as amended from time to time. 

(e) “Code” shall mean the Internal Revenue Code of 1986, as amended. 

(f) “Company” shall mean Imperva, Inc., a Delaware corporation. 

(g) “Consultant” shall mean a person who performs bona fide services for the Company, a Parent or a Subsidiary as a
consultant or advisor, excluding Employees and Outside Directors. 
 (h) “Employee” shall mean any individual
who is a common-law employee of the Company, a Parent or a Subsidiary. 
 (i) “Immediate Family” shall mean any
child, stepchild, grandchild, parent, stepparent, grandparent, spouse, sibling, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law and shall include adoptive relationships. 

(j) “Involuntary Termination” shall mean the termination of the Purchaser’s Service by reason of: 

(i) The involuntary discharge of the Purchaser by the Company (or the Parent or Subsidiary employing him or her) for
reasons other than Cause; or 
 (ii) The voluntary resignation of the Purchaser following (A) a change in
the Purchaser’s position with the Company (or the Parent or Subsidiary employing him or her) that materially reduces his or her level of authority or responsibility, (B) a reduction in the Purchaser’s base salary by more than 10% or
(C) receipt of notice that the Purchaser’s principal workplace will be relocated more than 30 miles. 
 (k)
“Outside Director” shall mean a member of the Board of Directors who is not an Employee. 
 (l)
“Parent” shall mean any corporation (other than the Company) in an unbroken chain of corporations ending with the Company, if each of the corporations other than the Company owns stock possessing 50% or more of the total combined
voting power of all classes of stock in one of the other corporations in such chain. 
 (m) “Purchased Shares”
shall mean the Shares purchased by the Purchaser pursuant to this Agreement. 

  
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 (n) “Purchase Price” shall mean the amount for which one Share may be
purchased pursuant to this Agreement, as specified in the Summary of Stock Purchase. 
 (o) “Purchaser” shall
mean the person named in the Summary of Stock Purchase. 
 (p) “Repurchase Period” shall mean a period of 90
consecutive days commencing on the date when the Purchaser’s Service terminates for any reason, including (without limitation) death or disability. 
 (q) “Restricted Share” shall mean a Purchased Share that is subject to the Right of Repurchase. 
 (r) “Right of First Refusal” shall mean the Company’s right of first refusal described in Section 3. 
 (s) “Right of Repurchase” shall mean the Company’s right of repurchase described in Section 2. 
 (t) “Securities Act” shall mean the Securities Act of 1933, as amended. 
 (u) “Service” shall mean service as an Employee, Outside Director or Consultant. 
 (v) “Share” shall mean one share of Stock. 
 (w)
“Stock” shall mean the Common Stock of the Company. 
 (x) “Subsidiary” shall mean any
corporation (other than the Company) in an unbroken chain of corporations beginning with the Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50% or more of the total combined voting
power of all classes of stock in one of the other corporations in such chain. 
 (y) “Summary of Stock
Purchase” shall mean the document so entitled to which this Agreement is attached. 
 (z) “Transferee”
shall mean any person to whom the Purchaser has directly or indirectly transferred any Purchased Share. 
 (aa)
“Transfer Notice” shall mean the notice of a proposed transfer of Purchased Shares described in Section 3. 

  
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 EXHIBIT I 

SECTION 83(b) ELECTION 
 This statement is made under Section 83(b) of the Internal Revenue Code of 1986, as amended, pursuant to Treasury Regulations Section 1.83-2. 

 

	 	(a)	The taxpayer who performed the services is: 

  

							
	Name:	 	Shlomo Kramer	  	
	Address:	 	  
	  	
			
		 	 
	  	
	Social Security No.:	  	 
	  	

  
  

	 	(b)	The property with respect to which the election is made is 1,265,730 shares of the common stock of Imperva, Inc. 

 

	 	(c)	The property was transferred on September 29, 2010. 

  

	 	(d)	The taxable year for which the election is made is the calendar year 2010. 

 

	 	(e)	The property is subject to a repurchase right pursuant to which the issuer has the right to acquire the property at the original purchase price if for any reason
taxpayer’s service with the issuer terminates. The issuer’s repurchase right lapses in a series of installments over a four-year period ending on September 29, 2014. 

 

	 	(f)	The fair market value of such property at the time of transfer (determined without regard to any restriction other than a restriction that by its terms will never
lapse) is $1.65 per share. 

  

	 	(g)	The amount paid for such property is $1.65 per share. 

  

	 	(h)	A copy of this statement was furnished to Imperva, Inc., for whom taxpayer rendered the services underlying the transfer of such property. 

 

	 	(i)	This statement is executed on September 29, 2010. 

  

					
	  
	 		  	  

	Signature of Spouse (if any)	 		  	Signature of Taxpayer

 Within 30 days after
the date of purchase, this election must be filed with the Internal Revenue Service Center where the Purchaser files his or her federal income tax returns. The filing should be made by registered or certified mail, return receipt requested. The
Purchaser must (a) file a copy of the completed form with his or her federal tax return for the current tax year and (b) deliver an additional copy to the Company.Stock Purchase Agreement,(421,909 shares of common stock purchased)

 Exhibit 10.10 
 IMPERVA, INC. 
 SUMMARY
OF STOCK PURCHASE (WITH ACCELERATION) 
 The Purchaser is
acquiring shares of the Common Stock of Imperva, Inc. on the following terms: 
  

			
	Name of Purchaser:	  	Shlomo Kramer
		
	Total Number of Purchased Shares:	  	421,909
		
	Purchase Price per Share:	  	$1.65
		
	Date of Offer:	  	September 30, 2010
		
	Date of Purchase:	  	September 30, 2010
		
	Vesting Commencement Date:	  	 September 30, 2010

		
	Vesting Schedule:	  	The Right of Repurchase shall lapse with respect to all Purchased Shares when the Purchaser completes 60 months of continuous Service after the Vesting Commencement Date set
forth above. In addition, the Right of Repurchase shall immediately lapse with respect to all Purchased Shares if the Company, before the Purchaser’s Service terminates, either (a) is subject to a Change in Control or (b) effects an
IPO (each, an “Exit Transaction”) and the Company is valued at more than $500 million in such Exit Transaction, as determined by using the fair market value of the consideration paid to the Company’s stockholders in a Change of
Control (as set forth in the Company’s Certificate of Incorporation, as amended from time to time) or as determined by using the final “price to public” set forth on the cover of the Company’s final prospectus filed pursuant to
Rule 424(b)(4) in connection with the Company’s IPO.

 The Purchase Price must be paid on or before the Date of
Purchase set forth above. If the Purchaser fails to make payment before the Date of Purchase, this offer automatically terminates. 
 By
signing below, the Purchaser and the Company agree that the acquisition of the Purchased Shares is governed by the terms and conditions of the Stock Purchase Agreement. The Stock Purchase Agreement is attached to, and made a part of, this Summary of
Stock Purchase. The Purchaser further agrees that the Company may deliver by email all documents relating to this purchase and all other documents that the Company is required to deliver to its security holders (including, without limitation,
disclosures that may be required by the Securities and Exchange Commission). The Purchaser also agrees that the Company may deliver these documents by posting them on a website maintained by the Company or by a third party under contract with the
Company. If the Company posts these documents on a website, it shall notify the Purchaser by email. 
  

									
	PURCHASER:	 		 		 	IMPERVA, INC.
					
	 /s/ Shlomo Kramer
	 		 		 	By:	 	 /s/ Aviv Shoham

	Shlomo Kramer	 		 		 	Title:	 	 VP Finance

 IMPERVA, INC. 

STOCK PURCHASE AGREEMENT 
 SECTION 1. ACQUISITION OF SHARES. 
 (a) Transfer. On the terms and
conditions set forth in the Summary of Stock Purchase and this Agreement, the Company agrees to transfer to the Purchaser the number of Shares set forth in the Summary of Stock Purchase. The transfer shall occur at the offices of the Company on the
date of purchase set forth in the Summary of Stock Purchase or at such other place and time as the parties may agree. 
 (b)
Consideration. The Purchaser agrees to pay the Purchase Price set forth in the Summary of Stock Purchase for each Purchased Share. Payment shall be made in cash or cash equivalents on the date of purchase set forth in the Summary of Stock
Purchase. 
 (c) Withholding Taxes. The Purchaser, as a condition to the transfer of the Purchased Shares, shall make
arrangements satisfactory to the Company to enable it to satisfy all federal and state tax withholding requirements. 
 (d)
Defined Terms. Capitalized terms are defined in Section 12 of this Agreement. 
 SECTION 2. RIGHT OF REPURCHASE. 

(a) Scope of Repurchase Right. Until they vest in accordance with the Summary of Stock Purchase and Subsection (b) below, the
Purchased Shares shall be Restricted Shares and shall be subject to the Company’s Right of Repurchase. The Company, however, may decline to exercise its Right of Repurchase or may exercise its Right of Repurchase only with respect to a portion
of the Restricted Shares. The Company may exercise its Right of Repurchase only during the Repurchase Period following the termination of the Purchaser’s Service. The Right of Repurchase may be exercised automatically under Subsection (d)
below. If the Right of Repurchase is exercised, the Company shall pay the Purchaser an amount equal to the Purchase Price for each of the Restricted Shares being repurchased. 
 (b) Lapse of Repurchase Right. The Right of Repurchase shall lapse with respect to the Restricted Shares in accordance with the vesting schedule set forth in the Summary of Stock Purchase. In
addition, the Right of Repurchase shall immediately lapse with respect to all Restricted Shares if the Company, before the Purchaser’s Service terminates, either (i) is subject to a Change in Control or (ii) effects an IPO, (each, an
“Exit Transaction”) and the Company is valued at more than $500 million in such Exit Transaction, as determined by using the fair market value of the consideration paid to the Company’s stockholders in a Change of Control (as set
forth in the Company’s Certificate of Incorporation, as amended from time to time) or as determined by using the final “price to public” set forth on the cover of the 

 
Company’s final prospectus filed pursuant to Rule 424(b)(4) in connection with the Company’s IPO. 
 (c) Escrow. Upon issuance, the certificate(s) for Restricted Shares shall be deposited in escrow with the Company to be held in accordance with the provisions of this Agreement. Any additional or
exchanged securities or other property described in Subsection (f) below shall immediately be delivered to the Company to be held in escrow. All ordinary cash dividends on Restricted Shares (or on other securities held in escrow) shall be paid
directly to the Purchaser and shall not be held in escrow. Restricted Shares, together with any other assets held in escrow under this Agreement, shall be (i) surrendered to the Company for repurchase upon exercise of the Right of Repurchase or
the Right of First Refusal or (ii) released to the Purchaser upon his or her request to the extent that the Shares have ceased to be Restricted Shares (but not more frequently than once every six months). In any event, all Purchased Shares that
have ceased to be Restricted Shares, together with any other vested assets held in escrow under this Agreement, shall be released within 90 days after the earlier of (i) the termination of the Purchaser’s Service or (ii) the
lapse of the Right of First Refusal. 
 (d) Exercise of Repurchase Right. The Company shall be deemed to have exercised
its Right of Repurchase automatically for all Restricted Shares as of the commencement of the Repurchase Period, unless the Company during the Repurchase Period notifies the holder of the Restricted Shares pursuant to Section 9 that it will not
exercise its Right of Repurchase for some or all of the Restricted Shares. During the Repurchase Period, the Company shall pay to the holder of the Restricted Shares the purchase price determined under Subsection (a) above for the Restricted
Shares being repurchased. Payment shall be made in cash or cash equivalents and/or by canceling indebtedness to the Company incurred by the Purchaser in the purchase of the Restricted Shares. The certificate(s) representing the Restricted Shares
being repurchased shall be delivered to the Company. 
 (e) Termination of Rights as Stockholder. If the Right of
Repurchase is exercised in accordance with this Section 2 and the Company makes available the consideration for the Restricted Shares being repurchased, then the person from whom the Restricted Shares are repurchased shall no longer have any
rights as a holder of the Restricted Shares (other than the right to receive payment of such consideration). Such Restricted Shares shall be deemed to have been repurchased pursuant to this Section 2, whether or not the certificate(s) for such
Restricted Shares have been delivered to the Company or the consideration for such Restricted Shares has been accepted. 
 (f)
Additional or Exchanged Securities and Property. In the event of a merger or consolidation of the Company with or into another entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of
an extraordinary dividend payable in a form other than stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including
cash or cash equivalents) that are by reason of such transaction exchanged for, or distributed with respect to, any Restricted Shares shall immediately be subject to the Right of Repurchase. Appropriate adjustments to reflect the exchange or
distribution of such securities or property shall be made to the number and/or class of the Restricted Shares. Appropriate adjustments shall also be made to the price per share to be 

  
 2 

 
paid upon the exercise of the Right of Repurchase, provided that the aggregate purchase price payable for the Restricted Shares shall remain the same. In the event of a merger or consolidation of
the Company with or into another entity or any other corporate reorganization, the Right of Repurchase may be exercised by the Company’s successor. 
 (g) Transfer of Restricted Shares. The Purchaser shall not transfer, assign, encumber or otherwise dispose of any Restricted Shares without the Company’s written consent, except as provided in
the following sentence. The Purchaser may transfer Restricted Shares to one or more members of the Purchaser’s Immediate Family or to a trust established by the Purchaser for the benefit of the Purchaser and/or one or more members of the
Purchaser’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by all provisions of this Agreement. If the Purchaser transfers any Restricted Shares, then this
Agreement shall apply to the Transferee to the same extent as to the Purchaser. 
 (h) Assignment of Repurchase Right.
The Board of Directors may freely assign the Company’s Right of Repurchase, in whole or in part. Any person who accepts an assignment of the Right of Repurchase from the Company shall assume all of the Company’s rights and obligations
under this Section 2. 
 (i) Part-Time Employment and Leaves of Absence. If the Purchaser commences working on a
part-time basis, then the Company may adjust the vesting schedule set forth in the Summary of Stock Purchase in accordance with the Company’s part-time work policy or the terms of an agreement between the Purchaser and the Company pertaining to
his or her part-time schedule. If the Purchaser goes on a leave of absence, then the Company may adjust the vesting schedule set forth in the Summary of Stock Purchase in accordance with the Company’s leave of absence policy or the terms of
such leave. Except as provided in the preceding sentence, Service shall be deemed to continue while the Purchaser is on a bona fide leave of absence, if (i) such leave was approved by the Company in writing and (ii) continued
crediting of Service is expressly required by the terms of such leave or by applicable law (as determined by the Company). Service shall be deemed to terminate when such leave ends, unless the Purchaser immediately returns to active work.

 SECTION 3. RIGHT OF FIRST REFUSAL. 
 (a) Right of First Refusal. In the event that the Purchaser proposes to sell, pledge or otherwise transfer to a third party any Purchased Shares, or any interest in Purchased Shares, the Company
shall have the Right of First Refusal with respect to all (and not less than all) of such Purchased Shares. If the Purchaser desires to transfer Purchased Shares, the Purchaser shall give a written Transfer Notice to the Company describing fully the
proposed transfer, including the number of Purchased Shares proposed to be transferred, the proposed transfer price, the name and address of the proposed Transferee and proof satisfactory to the Company that the proposed sale or transfer will not
violate any applicable federal, State or foreign securities laws. The Transfer Notice shall be signed both by the Purchaser and by the proposed Transferee and must constitute a binding commitment of both parties to the transfer of the Purchased
Shares. The Company shall have the right to purchase all, and not less than all, of the Purchased Shares on the terms of the proposal described in the Transfer Notice (subject, 

  
 3 

 
however, to any change in such terms permitted under Subsection (b) below) by delivery of a notice of exercise of the Right of First Refusal within 30 days after the date when the Transfer
Notice was received by the Company. 
 (b) Transfer of Shares. If the Company fails to exercise its Right of First
Refusal within 30 days after receiving the Transfer Notice, the Purchaser may, not later than 90 days after the Company received the Transfer Notice, conclude a transfer of the Purchased Shares subject to the Transfer Notice on the terms
and conditions described in the Transfer Notice, provided that any such sale is made in compliance with applicable federal, State and foreign securities laws and not in violation of any other contractual restrictions to which the Purchaser is bound.
Any proposed transfer on terms and conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Purchaser, shall again be subject to the Right of First Refusal and shall require compliance with
the procedure described in Subsection (a) above. If the Company exercises its Right of First Refusal, the parties shall consummate the sale of the Purchased Shares on the terms set forth in the Transfer Notice within 60 days after the
Company received the Transfer Notice (or within such longer period as may have been specified in the Transfer Notice); provided, however, that in the event the Transfer Notice provided that payment for the Purchased Shares was to be made in a form
other than cash or cash equivalents paid at the time of transfer, the Company shall have the option of paying for the Purchased Shares with cash or cash equivalents equal to the present value of the consideration described in the Transfer Notice.

 (c) Additional or Exchanged Securities and Property. In the event of a merger or consolidation of the Company with or
into another entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than stock, a spin-off, an adjustment in conversion ratio, a
recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of such transaction exchanged for, or distributed with respect
to, any Purchased Shares subject to this Section 3 shall immediately be subject to the Right of First Refusal. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made to the number and/or
class of the Purchased Shares subject to this Section 3. 
 (d) Termination of Right of First Refusal. Any other
provision of this Section 3 notwithstanding, in the event that the Stock is readily tradable on an established securities market when the Purchaser desires to transfer Purchased Shares, the Company shall have no Right of First Refusal, and the
Purchaser shall have no obligation to comply with the procedures prescribed by Subsections (a) and (b) above. 
 (e)
Permitted Transfers. This Section 3 shall not apply to (i) a transfer by beneficiary designation, will or intestate succession or (ii) a transfer to one or more members of the Purchaser’s Immediate Family or to a trust or
other entity established by the Purchaser for the benefit of the Purchaser and/or one or more members of the Purchaser’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be
bound by all provisions of this Agreement. If the Purchaser transfers any Purchased Shares, either under this Subsection (e) or after the Company has failed to exercise the 

  
 4 

 
Right of First Refusal, then this Agreement shall apply to the Transferee to the same extent as to the Purchaser. 
 (f) Termination of Rights as Stockholder. If the Company makes available, at the time and place and in the amount and form provided in this Agreement, the consideration for the Shares to be
purchased in accordance with this Section 3, then after such time the person from whom such Shares are to be purchased shall no longer have any rights as a holder of such Shares (other than the right to receive payment of such consideration in
accordance with this Agreement). Such Shares shall be deemed to have been purchased in accordance with the applicable provisions hereof, whether or not the certificate(s) therefor have been delivered as required by this Agreement. 

(g) Assignment of Right of First Refusal. The Board of Directors may freely assign the Company’s Right of First Refusal, in
whole or in part. Any person who accepts an assignment of the Right of First Refusal from the Company shall assume all of the Company’s rights and obligations under this Section 3. 
 SECTION 4. OTHER RESTRICTIONS ON TRANSFER. 
 (a) Purchaser
Representations. In connection with the issuance and acquisition of Shares under this Agreement, the Purchaser hereby represents and warrants to the Company as follows: 

(i) The Purchaser is acquiring and will hold the Purchased Shares for investment for his or her account only and not with
a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act. 
 (ii) The Purchaser understands that the Purchased Shares have not been registered under the Securities Act by reason of a specific exemption therefrom and that the Purchased Shares must be held
indefinitely, unless they are subsequently registered under the Securities Act or the Purchaser obtains an opinion of counsel, in form and substance satisfactory to the Company and its counsel, that such registration is not required. The Purchaser
further acknowledges and understands that the Company is under no obligation to register the Purchased Shares. 

(iii) The Purchaser is aware of the adoption of Rule 144 by the Securities and Exchange Commission under the
Securities Act, which permits limited public resales of securities acquired in a non-public offering, subject to the satisfaction of certain conditions, including (without limitation) the availability of certain current public information about the
issuer, the resale occurring only after the holding period required by Rule 144 has been satisfied, the sale occurring through an unsolicited “broker’s transaction,” and the amount of securities being sold during any three-month
period not exceeding specified limitations. The Purchaser acknowledges and understands that the conditions for resale set forth in 

  
 5 

 
Rule 144 have not been satisfied and that the Company has no plans to satisfy these conditions in the foreseeable future. 

(iv) The Purchaser will not sell, transfer or otherwise dispose of the Purchased Shares in violation of the Securities
Act, the Securities Exchange Act of 1934, or the rules promulgated thereunder, including Rule 144 under the Securities Act. The Purchaser agrees that he or she will not dispose of the Purchased Shares unless and until he or she has complied
with all requirements of this Agreement applicable to the disposition of Purchased Shares and he or she has provided the Company with written assurances, in substance and form satisfactory to the Company, that (A) the proposed disposition does
not require registration of the Purchased Shares under the Securities Act or all appropriate action necessary for compliance with the registration requirements of the Securities Act or with any exemption from registration available under the
Securities Act (including Rule 144) has been taken and (B) the proposed disposition will not result in the contravention of any transfer restrictions applicable to the Purchased Shares under the securities laws or regulations of any State.

 (v) The Purchaser has been furnished with, and has had access to, such information as he or she considers
necessary or appropriate for deciding whether to invest in the Purchased Shares, and the Purchaser has had an opportunity to ask questions and receive answers from the Company regarding the terms and conditions of the issuance of the Purchased
Shares. 
 (vi) The Purchaser is aware that his or her investment in the Company is a speculative investment that
has limited liquidity and is subject to the risk of complete loss. The Purchaser is able, without impairing his or her financial condition, to hold the Purchased Shares for an indefinite period and to suffer a complete loss of his or her investment
in the Purchased Shares. 
 (b) Securities Law Restrictions. Regardless of whether the offering and sale of Shares under
this Agreement have been registered under the Securities Act or have been registered or qualified under the securities laws of any State, the Company at its discretion may impose restrictions upon the sale, pledge or other transfer of the Purchased
Shares (including the placement of appropriate legends on stock certificates or the imposition of stop-transfer instructions) if, in the judgment of the Company, such restrictions are necessary or desirable in order to achieve compliance with the
Securities Act, the securities laws of any State or any other law. 
 (c) Market Stand-Off. In connection with any
underwritten public offering by the Company of its equity securities pursuant to an effective registration statement filed under the Securities Act, including the Company’s initial public offering, the Purchaser or a Transferee shall not
directly or indirectly sell, make any short sale of, loan, hypothecate, pledge, offer, grant or sell any option or other contract for the purchase of, purchase any option or other contract for the sale of, or otherwise dispose of or transfer, or
agree to engage in any of the foregoing transactions with respect to, any Purchased Shares without the prior written consent of the 

  
 6 

 
Company or its managing underwriter. Such restriction (the “Market Stand-Off”) shall be in effect for such period of time following the date of the final prospectus for the offering as
may be requested by the Company or such underwriter. In no event, however, shall such period exceed 180 days plus such additional period as may reasonably be requested by the Company or such underwriter to accommodate regulatory restrictions on
(i) the publication or other distribution of research reports or (ii) analyst recommendations and opinions, including (without limitation) the restrictions set forth in Rule 2711(f)(4) of the National Association of Securities Dealers
and Rule 472(f)(4) of the New York Stock Exchange, as amended, or any similar successor rules. The Market Stand-Off shall in any event terminate two years after the date of the Company’s initial public offering. In the event of the
declaration of a stock dividend, a spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities without receipt of consideration, any new, substituted or
additional securities which are by reason of such transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares thereby become convertible, shall immediately be subject to the Market Stand-Off. In
order to enforce the Market Stand-Off, the Company may impose stop-transfer instructions with respect to the Purchased Shares until the end of the applicable stand-off period. The Company’s underwriters shall be beneficiaries of the agreement
set forth in this Subsection (c). This Subsection (c) shall not apply to Shares registered in the public offering under the Securities Act. 
 (d) Rights of the Company. The Company shall not be required to (i) transfer on its books any Purchased Shares that have been sold or transferred in contravention of this Agreement or
(ii) treat as the owner of Purchased Shares, or otherwise to accord voting, dividend or liquidation rights to, any transferee to whom Purchased Shares have been transferred in contravention of this Agreement. 

SECTION 5. SUCCESSORS AND ASSIGNS. 
 Except as otherwise expressly provided to the contrary, the provisions of this Agreement shall inure to the benefit of, and be binding upon, the Company and its successors and assigns and be binding upon
the Purchaser and the Purchaser’s legal representatives, heirs, legatees, distributees, assigns and transferees by operation of law, whether or not any such person has become a party to this Agreement or has agreed in writing to join herein and
to be bound by the terms, conditions and restrictions hereof. 
 SECTION 6. EMPLOYMENT AT WILL. 

The Purchaser’s employment with the Company shall be “at will,” meaning that either the Purchaser or the Company shall be
entitled to terminate the Purchaser’s employment at any time and for any reason, with or without Cause. Nothing in this Agreement shall confer upon the Purchaser any right to continue in Service for any period of specific duration. Any contrary
representations that may have been made to the Purchaser shall be superseded by this Agreement. This Agreement shall constitute the full and complete agreement between the Purchaser and the Company on the “at will” nature of the
Purchaser’s employment, which may only be changed in an express written agreement signed by the Purchaser and a duly authorized officer of the Company (other than the Purchaser). 

  
 7 

 SECTION 7. TAX ELECTION. 
 The acquisition of the Purchased Shares may result in adverse tax consequences that may be avoided or mitigated by filing an election under Code Section 83(b). Such election may be filed only within
30 days after the date of purchase set forth in the Summary of Stock Purchase. The form for making the Code Section 83(b) election is attached to this Agreement as an Exhibit. The Purchaser should consult with his or her tax advisor to
determine the tax consequences of acquiring the Purchased Shares and the advantages and disadvantages of filing the Code Section 83(b) election. The Purchaser acknowledges that it is his or her sole responsibility, and not the Company’s,
to file a timely election under Code Section 83(b), even if the Purchaser requests the Company or its representatives to make this filing on his or her behalf. 
 SECTION 8. LEGENDS. 
 All certificates evidencing Purchased Shares shall
bear the following legends: 
 “THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, ENCUMBERED OR IN ANY
MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY CERTAIN RIGHTS OF FIRST
REFUSAL UPON AN ATTEMPTED TRANSFER OF THE SHARES AND CERTAIN REPURCHASE RIGHTS UPON TERMINATION OF SERVICE WITH THE COMPANY. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE HOLDER HEREOF WITHOUT
CHARGE.” 
 “THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND
MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.” 

If required by the authorities of any State in connection with the issuance of the Purchased Shares, the legend or legends required by such State
authorities shall also be endorsed on all such certificates. 
 SECTION 9. NOTICE. 

Any notice required by the terms of this Agreement shall be given in writing. It shall be deemed effective upon (i) personal
delivery, (ii) deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid or (iii) deposit with Federal Express Corporation, with shipping charges prepaid. Notice shall be addressed to the

  
 8 

 
Company at its principal executive office and to the Purchaser at the address that he or she most recently provided to the Company in accordance with this Section 9. 

SECTION 10. ENTIRE AGREEMENT. 
 The Summary of Stock Purchase and this Agreement constitute the entire contract between the parties hereto with regard to the subject matter hereof. They supersede any other agreements, representations or
understandings (whether oral or written and whether express or implied) that relate to the subject matter hereof. The Purchaser acknowledges that the grant of the right to acquire the Purchased Shares fully satisfies the Company’s obligation to
the Purchaser with respect to the grant of equity. The Purchaser further acknowledges that any additional grant of equity to the Purchaser will occur only to the extent it is approved by the Board of Directors, at its sole discretion. 

SECTION 11. CHOICE OF LAW. 
 This Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, as such laws are applied to contracts entered into and performed in such State. 

SECTION 12. DEFINITIONS. 

(a) “Agreement” shall mean this Stock Purchase Agreement. 

(b) “Board of Directors” shall mean the Board of Directors of the Company, as constituted from time to time. 

(c) “Change in Control” shall mean a “Liquidation Event,” as defined in the Company’s Certificate of
Incorporation, as amended from time to time. 
 (d) “Code” shall mean the Internal Revenue Code of 1986, as
amended. 
 (e) “Company” shall mean Imperva, Inc., a Delaware corporation. 

(f) “Consultant” shall mean a person who performs bona fide services for the Company, a Parent or a Subsidiary as a
consultant or advisor, excluding Employees and Outside Directors. 
 (g) “Employee” shall mean any individual
who is a common-law employee of the Company, a Parent or a Subsidiary. 
 (h) “Immediate Family” shall mean any
child, stepchild, grandchild, parent, stepparent, grandparent, spouse, sibling, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law and shall include adoptive relationships. 

  
 9 

 (i) “IPO” shall mean the Company’s sale of its Common Stock in a
firm-commitment underwritten public offering pursuant to a registration statement on Form S-1 or SB-2 under the Securities Act. 

(j) “Outside Director” shall mean a member of the Board of Directors who is not an Employee. 

(k) “Parent” shall mean any corporation (other than the Company) in an unbroken chain of corporations ending with the
Company, if each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 

(l) “Purchased Shares” shall mean the Shares purchased by the Purchaser pursuant to this Agreement. 

(m) “Purchase Price” shall mean the amount for which one Share may be purchased pursuant to this Agreement, as specified
in the Summary of Stock Purchase. 
 (n) “Purchaser” shall mean the person named in the Summary of Stock
Purchase. 
 (o) “Repurchase Period” shall mean a period of 90 consecutive days commencing on the date when the
Purchaser’s Service terminates for any reason, including (without limitation) death or disability. 
 (p)
“Restricted Share” shall mean a Purchased Share that is subject to the Right of Repurchase. 
 (q)
“Right of First Refusal” shall mean the Company’s right of first refusal described in Section 3. 

(r) “Right of Repurchase” shall mean the Company’s right of repurchase described in Section 2. 

(s) “Securities Act” shall mean the Securities Act of 1933, as amended. 

(t) “Service” shall mean service as an Employee, Outside Director or Consultant. 

(u) “Share” shall mean one share of Stock. 
 (v) “Stock” shall mean the Common Stock of the Company. 
 (w)
“Subsidiary” shall mean any corporation (other than the Company) in an unbroken chain of corporations beginning with the Company, if each of the corporations other than the last corporation in the unbroken chain owns stock
possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 

  
 10 

 (x) “Summary of Stock Purchase” shall mean the document so entitled to
which this Agreement is attached. 
 (y) “Transferee” shall mean any person to whom the Purchaser has directly
or indirectly transferred any Purchased Share. 
 (z) “Transfer Notice” shall mean the notice of a proposed
transfer of Purchased Shares described in Section 3. 

  
 11 

 EXHIBIT I 

SECTION 83(b) ELECTION 
 This statement is made under Section 83(b) of the Internal Revenue Code of 1986, as amended, pursuant to Treasury Regulations Section 1.83-2. 

 

	 	(a)	The taxpayer who performed the services is: 

  

							
	Name:	 	Shlomo Kramer	  	
	Address:	 	  
	  	
			
		 	 
	  	
	Social Security No.:	  	 
	  	

  

	 	(b)	The property with respect to which the election is made is 421,909 shares of the common stock of Imperva, Inc. 

 

	 	(c)	The property was transferred on September 29, 2010. 

  

	 	(d)	The taxable year for which the election is made is the calendar year 2010. 

 

	 	(e)	The property is subject to a repurchase right pursuant to which the issuer has the right to acquire the property at the original purchase price if for any reason
taxpayer’s service with the issuer terminates. The issuer’s repurchase right lapses on May 1, 2015. 

  

	 	(f)	The fair market value of such property at the time of transfer (determined without regard to any restriction other than a restriction that by its terms will never
lapse) is $1.65 per share. 

  

	 	(g)	The amount paid for such property is $1.65 per share. 

  

	 	(h)	A copy of this statement was furnished to Imperva, Inc., for whom taxpayer rendered the services underlying the transfer of such property. 

 

	 	(i)	This statement is executed on September 29, 2010. 

  

					
	  
 Signature of Spouse (if
any)
	 		 	  
 Signature of
Taxpayer

 Within 30 days after the date of purchase, this election must be filed with the Internal Revenue Service
Center where the Purchaser files his or her federal income tax returns. The filing should be made by registered or certified mail, return receipt requested. The Purchaser must (a) file a copy of the completed form with his or her federal tax
return for the current tax year and (b) deliver an additional copy to the Company.

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