Document:

Offer Letter

 Exhibit 10.30 
 KAYAK 
 Wednesday, September 30, 2009 

Ms. Melissa Reiter 
 Chicago, Illinois

 Dear Melissa: 
 I am pleased to
offer you the position of VP, Finance at Kayak.com (“Kayak”). This position is located in our Norwalk, CT office and reports directly to our CEO, Steve Hafner. This letter sets forth the material terms of our offer of employment to
you. This offer shall be subject to your ability to provide verification of your authorization to work in the United States. 
 Start Date
and Severance. Your employment will start on a date to be agreed upon by you and Kayak, and is expected to be no later than November 2nd, 2009. Your employment with Kayak will be at will,” meaning that either you or Kayak may
terminate, and that Kayak can change the terms of, our employment relationship at any time and for any reason, with or without notice and with or without cause, provided, however, that you will be entitled to receive six (6) months base salary
plus bonus and payment of COBRA insurance coverage for a six (6) month severance term if your employment is terminated as a result of involuntary termination other than for cause; provided, further, that you will be entitled to receive six
(6) months base salary for a six (6) month severance term if Kayak hires a Chief Financial Officer (“CFO”) and you elect to terminate your employment at anytime with the 6 month period following the hiring of such CFO.

 Base Salary. Your starting salary will be $215,000 on an annualized basis, payable according to Kayak’s normal payroll
policy and subject to normal tax withholdings. Your salary will be reviewed periodically, and any adjustment in your salary will be determined by Kayak management in its sole discretion. 
 Annual Bonus. You will be eligible for an annual incentive bonus up to 30% of your annual base compensation, payable at Kayak’s sole discretion in either cash or restricted stock.
Actual payout will based on performance against goals and objectives established at the beginning of each fiscal year and will be determined by Kayak management in its sole discretion. Notwithstanding the above, you will receive a guaranteed 2009
bonus of $50,000 for your work to be paid in 2010 at the same time as Kayak’s 2009 bonus payments to employees. 
 Sign On
Bonus. You will be paid a sign on bonus in the amount of $20,000 following commencement of your employment. 
 Stock Options. You
will be permitted to participate in Kayak’s stock incentive plan. Pursuant to the plan, and subject to Board of Director approval we expect you will be granted 100,000 stock options. We anticipate that the shares of common stock subject
to your stock option will be subject to vesting over four years so long as you continue to be employed with Kayak, according to the following schedule: twenty five percent (25%) of such shares will vest on the first anniversary of the date that
you commence employment with Kayak; and the balance of such shares (75%) will vest on a pro rata basis at the end of each monthly period thereafter for the next thirty-six months. Any stock options and restricted stock granted to you will be on
such terms and conditions, including, but not limited to, exercise price, vesting periods and repurchase rights, as are determined by Kayak management in its sole discretion and reflected in an agreement between Kayak and you. 

 Benefits. During your employment, you will be eligible to participate in family healthcare (medical
and dental) insurance plans, employee long-term disability and life insurance plans, flexible spending plan and Kayak’s 401(k) plan, and other benefits made available to Kayak’s leadership team, subject to the terms and conditions of those
plans, which may be changed by Kayak from time to time. You are eligible to participate in the healthcare insurance plans on the first of the month from your hire date and are eligible to participate in the other plans on your hire date. 

Moving Reimbursement. Kayak will reimburse you for up to $20,000 in expenses incurred to relocate from your current residence in Chicago to the
New York/Connecticut area. 
 Vacation. You will accrue at least three weeks of paid vacation annually, subject to the terms and
conditions of Kayak’s vacation policy. 
 Agreement Regarding Confidentiality and Inventions. As a condition of employment, you
agree to sign and comply with Kayak’s standard agreement regarding confidentiality and assignment of inventions. 
 This letter supercedes
any previous discussions, representations and agreements you may have had about the terms of your possible employment with Kayak. By accepting this offer, you agree and acknowledge that you have not relied, and are not relying, on any oral or
written statements, promises or representations made by any employee, agent, or representative of Kayak that are not expressly set forth in this letter. 
 Please indicate your acceptance of the terms of this offer letter by signing and dating this letter and returning it to me by October 1, 2009. 

Please do not hesitate to contact me if you have any questions. 
 Sincerely, 
  

	
	Kayak.com
	
	 /s/ Steve Hafner

	Steve Hafner
	CEO & Cofounder
	Kayak.com
	55 North Water Street, Suite 1
	Norwalk CT 06854 US
	Tel +1 203 899-3104
	Fax +1 203 899-3125

 I have carefully read and fully understand all of the terms of this offer letter and accept employment with
Kayak on those terms. 
  

			
	 /s/ Melissa Reiter

	Melissa Reiter

  

			
	Dated:	 	     9/30/09Stock Option Agreement

 Exhibit 10.31 
 KAYAK SOFTWARE CORPORATION 
 AMENDED AND
RESTATED 2005 EQUITY INCENTIVE PLAN 
 STOCK OPTION AGREEMENT

 THIS AGREEMENT, dated as of April 29, 2010, is by and between Kayak Software
Corporation, a corporation organized under the laws of the State of Delaware (the “Company”), and the individual identified below, residing at the address there set out (the “Optionee”). 

1. Grant of Option. Pursuant and subject to the Company’s Amended and Restated 2005 Equity Incentive Plan (as the same may be
amended from time to time, the “Plan”), the Company hereby grants to the Optionee an option (the “Option”) to purchase from the Company all or any part of a total of 200,000 shares (the
“Optioned Shares”) of the Company’s common stock, par value $0.001 per share (the “Common Stock”), at a price of $13.00 per share. The Grant Date of this Option is as of the date hereof.

 2. Character of Option. This Option is to be treated as an “incentive stock option” within the meaning of
Section 422 of the Internal Revenue Code of 1986, as amended, to the extent of the “current limit” (as defined in the Plan); any Optioned Shares that would cause the foregoing limit to be violated shall be deemed to have been granted
under a separate Nonstatutory Option, otherwise identical in its terms to those of this Incentive Option. 
 3. Duration of
Option. Subject to the following sentence, this Option shall expire at 5:00 p.m. on April 28, 2020. However, if the Optionee’s employment or other association with the Company and its Affiliates ends before such date, this Option shall
expire at 5:00 p.m. on the earlier to occur of (a) April 28, 2020 and (b) the date that is ninety (90) days after the date of such termination. 
 4. Exercise of Option. Until this Option expires, the Optionee may exercise it as to the number of Optioned Shares identified in the table below, in full or in part, at any time on or after the
applicable exercise date or dates identified in the table. However, during any period that this Option remains outstanding after the Optionee’s employment or other association with the Company and its Affiliates ends, the Optionee may exercise
it only to the extent it was exercisable immediately prior to the end of the Optionee’s employment or other association. The procedure for exercising this Option is described in Section 7.1(f) of the Plan. 

 

			
	 Number of Optioned Shares

in Each Installment
	  	 Initial Exercise Date

for Shares in Installment

		
	4,167 Optioned Shares	  	4,167 Optioned Shares will become exercisable on January 1, 2010 (the “Initial Vesting Date”) and thereafter on each one-month anniversary of the Initial Vesting Date
until January 1, 2014 when all Optioned Shares shall be fully vested.

 Upon the occurrence of a Change of
Control, the Option shall become exercisable in accordance with the terms and conditions of the Plan, including without limitation Section 8.2 therein. 

 5. Stockholders Agreement; Consent of Spouse. As a condition to exercising this
Option and receiving any stock certificates representing the Optioned Shares, (a) the Optionee shall, if so requested by the Company, execute and deliver to the Company the Stockholders Agreement, and become a “Holder” party thereto,
and (b) if and to the extent required by the Committee, each and any person who is a spouse of the Optionee at any time on or after the Grant Date (including any person who becomes a spouse after the Grant Date) executes the Consent of Spouse
attached hereto as Exhibit A. The Optionee shall have none of the rights of a stockholder with respect to the Optioned Shares until full payment therefor has been made and, if so requested by the Company, the Stockholders Agreement has been
executed and delivered to the Company by the Optionee. Notwithstanding the foregoing, to the extent the Optioned Shares have become readily tradable on a nationally recognized exchange or market, then the foregoing provisions of clause (a) of
this Section 5 shall not apply. 
 6. Repurchase of Optioned Shares. If the Optionee incurs a termination of
employment or other association with the Company and its Affiliates, all or any portion of the Optioned Shares received by the Optionee upon exercise of this Option, to the extent held by the Optionee at the time of such termination or received by
the Optionee upon exercise of all or part of this Option after such termination, may be purchased by the Company, at its option, within ninety (90) days after the later of (a) such termination or (b) receipt of such Optioned Shares by
the Optionee following exercise of all or part of this Option. If such termination is due to death or Disability or is by the Company other than for Cause or by the Optionee for Good Reason the amount in cash to be paid for the repurchase of such
Optioned Shares shall be equal to the Market Value as of the date of such termination multiplied by the number of such Optioned Shares. If such termination is by the Company for Cause or by the Optionee for any reason other than death,
Disability or Good Reason, the amount in cash to be paid for the repurchase of such Optioned Shares shall be equal to the aggregate purchase price paid for such Optioned Shares. Notwithstanding the foregoing, the Company’s purchase right set
forth in this Section 6 shall lapse to the extent the Optioned Shares become readily tradable on a nationally recognized exchange or market. 
 7. Transfer of Option. Except as otherwise provided in Section 6.3 (and, if applicable, Section 15.4) of the Plan, the Optionee may not transfer this Option except by will or the laws of
descent and distribution, and, during the Optionee’s lifetime, only the Optionee may exercise this Option. 
 8.
Incorporation of Plan Terms. This Option is granted subject to, and the Optionee hereby expressly agrees to, all of the applicable terms and provisions of the Plan, including but not limited to the limitations set forth in Section 9
therein. 
 9. Tax Consequences. The Company makes no representation or warranty as to the tax treatment to the Optionee
of the Optionee’s receipt or exercise of this Option or upon the Optionee’s sale or other disposition of the Optioned Shares. The Optionee should rely on the Optionee’s own tax advisors for such advice. 

10. Miscellaneous. This Agreement shall be construed and enforced in accordance with the laws of the Commonwealth of
Massachusetts, without regard to the conflict of laws principles thereof and shall be binding upon and inure to the benefit of any successor or assign of the Company and any executor, administrator, trustee, guardian, or other legal representative
of you. Capitalized terms used but not defined herein shall have the meanings assigned under the Plan. This Agreement may be executed in one or more counterparts all of which together shall constitute but one instrument. 

[signature page follows] 

 IN WITNESS WHEREOF, the
parties have executed this Agreement as a sealed instrument as of the date first above written. 
  

			
	Company:
	
	KAYAK SOFTWARE CORPORATION
		
	By:	 	 /s/ Daniel Stephen Hafner

		 	Name: Daniel Stephen Hafner
		 	Title: Chief Executive Officer

  

			
	Optionee:
	
	 /s/ Daniel Stephen Hafner

	Name:	 	Daniel Stephen Hafner
	Address:	 	

 Exhibit A 
 Consent of Spouse 
 (for Residents of Community Property States Only) 

            , 20     

My name is
                             and I am the spouse of
                             (the “Recipient”), the recipient of the Option
(as defined in the Agreement (as defined below)), which Option was granted pursuant to the Kayak Software Corporation 2005 Equity Incentive Plan, as amended from time to time (the “Plan”). 

I have read and understand the attached Stock Option Agreement (the “Agreement”). 

I understand that, because I am a resident of the State of
                     (the “State”), the community property laws of the State may provide me with certain rights or
interests in the Option and the Optioned Shares (as defined in the Agreement). After having considered the terms of the Agreement and my rights and interests under the community property laws of the State and for good and valuable consideration,
receipt of which is hereby acknowledged: 
  

	 	1.	I hereby consent and agree to each and every term and condition set forth in the Agreement. 

 

	 	2.	I hereby understand and agree that the Recipient may join in any future modification or amendment of the Agreement without any further signature, acknowledgment,
agreement or consent on my part. 

  

	 	3.	I understand that any interest that the Recipient has in the Option or the Optioned Shares is subject to the terms of the Agreement and the Plan.

  

	 	4.	I understand that, by agreeing to the terms of the Agreement and by executing this Consent of Spouse, I may be waiving certain of my rights and interests under the
community property laws of the State. 

 IN WITNESS WHEREOF, the undersigned has executed this Consent of Spouse,
effective as of the date first above written. 
  

	
	  

	Name:

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