Document:

Form of Registrant's Class B Common Stock Certificate

 Exhibit 4.8 

 
 

 
 PO BOX 43004, Providence, RI 02940-3004 

MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 

CUSIP XXXXXX XX X Holder ID XXXXXXXXXX 
 Insurance Value 00.1,000,000 Number of Shares 123456 
 DTC 12345678901234512345678 
 Certificate Numbers
Num/No Denom. Total. 
 1234567890/1234567890 111 1234567890/1234567890 222 1234567890/1234567890 333
1234567890/1234567890 444 1234567890/1234567890 555 1234567890/1234567890 666 
 Total Transaction 7 

Certificate Number 
 ZQ 000000 
 016570|
003590|127C|RESTRICTED||4|057-423 
 CLASS B COMMON STOCK 

PAR VALUE $0.001 
 CLASS B COMMON STOCK 
 THIS CERTIFICATE IS
TRANSFERABLE IN CANTON, MA AND NEW YORK, NY 
 Shares 

THIS CERTIFIES THAT 
 is the owner of 
 KAYAK SOFTWARE CORPORATION

 INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 

** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****
Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David
Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample MR. **** Mr. Alexander SAMPLE David Sample ****
Mr. Alexander David &Sample MRS. **** Mr. Alexander David SAMPLE Sample **** Mr. Alexander David & Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****
Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David
Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander MR. David Sample SAMPLE ****
Mr. Alexander David Sample & **** Mr. Alexander MRS. David Sample **** SAMPLE Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****
Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David
Sample 
 **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David
Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr. Sample 

**000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***
 *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****
000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0
00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00 ***ZERO HUNDRED THOUSAND
0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000
000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000
00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000
0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000
**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000* ZERO HUNDRED AND ZERO***
*Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**
Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S 
 SEE REVERSE FOR CERTAIN DEFINITIONS 
 FULLY-PAID
AND NON-ASSESSABLE SHARES OF THE CLASS B COMMON STOCK OF 
 KAYAK Software Corporation (hereinafter called the
“Company”), transferable on the books of the Company in person or by duly authorized attorney, upon surrender of this Certificate properly endorsed. 
 This Certificate and the shares represented hereby, are issued and shall be held subject to all of the provisions of the Certificate of Incorporation, as amended, and the By-Laws, as
amended, of the Company (copies of which are on file with the Company and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents. This Certificate is not valid unless countersigned and registered by the Transfer Agent
and Registrar. 
 Witness the facsimile seal of the Company and the facsimile signatures of its duly authorized
officers. 
 DATED <<Month Day, Year>> 

COUNTERSIGNED AND REGISTERED: 
 COMPUTERSHARE TRUST COMPANY, N.A. 
 TRANSFER AGENT
AND REGISTRAR, 
 By 
 AUTHORIZED SIGNATURE 
 President 

Secretary 
 1234567 

 

 
 KAYAK SOFTWARE CORPORATION 

THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH SHAREHOLDER WHO SO REQUESTS, A SUMMARY OF THE POWERS, DESIGNATIONS,
PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OF THE COMPANY AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS, AND THE VARIATIONS IN RIGHTS, PREFERENCES AND
LIMITATIONS DETERMINED FOR EACH SERIES, WHICH ARE FIXED BY THE CERTIFICATE OF INCORPORATION OF THE COMPANY, AS AMENDED, AND THE RESOLUTIONS OF THE BOARD OF DIRECTORS OF THE COMPANY, AND THE AUTHORITY OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS
FOR FUTURE SERIES. SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE COMPANY OR TO THE TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE OWNER OF A LOST OR DESTROYED STOCK CERTIFICATE, OR HIS LEGAL REPRESENTATIVES, TO GIVE THE
COMPANY A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR DESTRUCTION OF ANY SUCH CERTIFICATE. 

The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though
they were written out in full 
 according to applicable laws or regulations: 

TEN COM—as tenants in common UNIF GIFT MIN ACT—Custodian 

(Cust)(Minor) 
 TEN ENT—as tenants by the entireties under Uniform Gifts to Minors Act 
 (State) 
 JT TEN—as joint tenants with right
of survivorship UNIF TRF MIN ACT—Custodian (until age ) 
 and not as tenants in common(Cust) 

under Uniform Transfers to Minors Act 
 (Minor)(State) 
 Additional abbreviations may also
be used though not in the above list. 
 For value received,
            hereby sell, assign and transfer unto 

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE 

(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) 

of the Class B Common Stock represented by the within Certificate, and do hereby irrevocably constitute and appoint

 Shares 
 to transfer the said stock on the books of the within-named Company with full power of substitution in the premises. 

Attorney 
 Dated:             20             

Signature:              

Signature:             Notice: The signature to this
assignment must correspond with the name as written upon the face of the certificate, in every particular, without alteration or enlargement, or any change whatever. 
 THE SIGNATURE(S) Signature(s) SHOULD BE Guaranteed: GUARANTEED BY Medallion AN ELIGIBLE Guarantee GUARANTOR Stamp INSTITUTION (Banks, Stockbrokers, SIGNATURE GUARANTEE Savings and Loan
MEDALLION Associations PROGRAM, and Credit PURSUANT Unions) WITH TO S. E. MEMBERSHIP C. RULE 17Ad-15. IN AN APPROVED 
 The IRS requires that we report the cost basis of certain shares acquired after January 1, 2011. If your shares were covered by the legislation and you have sold or transferred the
shares and requested a specific cost basis calculation method, we have processed as requested. If you did not specify a cost basis calculation method, we have defaulted to the first in, first out (FIFO) method. Please visit our website or consult
your tax advisor if you need additional information about cost basis. 
 If you do not keep in contact with us or
do not have any activity in your account for the time periods specified by state law, your property could become subject to state unclaimed property laws and transferred to the appropriate state. 

1234567Third Amendment to the Sixth Amended and Restated Investor Rights Agreement

 Exhibit 4.10 
 THIRD AMENDMENT TO THE 
 SIXTH AMENDED AND RESTATED INVESTOR
RIGHTS AGREEMENT 
 THIS THIRD AMENDMENT TO THE SIXTH AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT (this
“Amendment”) made as of the 8th day of May 2012, by and among (i) KAYAK Software Corporation, a Delaware corporation (the “Company”), (ii) those persons and entities listed under the heading “Investors”
on Schedule I hereto (the “Investors”) and (iii) those persons listed under the heading “Founders” on Schedule I hereto (the “Founders”). Capitalized terms not defined herein shall have
the meanings ascribed to them in the Agreement (as defined below).  
 W I T N E S S E T H: 

WHEREAS, the Company, the Investors and the Founders have heretofore entered into a Sixth Amended and Restated Investor Rights
Agreement, dated as of March 22, 2010, as subsequently amended on October 1, 2010, and February 10, 2012 (together with all exhibits thereto, the “Agreement”); and 

WHEREAS, the Company, the Investors and the Founders, constituting the Requisite Investors, have mutually agreed to amend a
certain provision contained in the Agreement. 
 NOW, THEREFORE, in consideration of good and valuable consideration, the
receipt and legal sufficiency of which is hereby acknowledged, the Company, the Investors and the Founders hereby agree as follows: 
 1. Section 1. Section 1 of the Agreement is hereby amended by deleting in its entirety the definition of “Reserved Employee Shares” found therein and replacing it with
the following: 
 “Reserved Employee Shares” shall mean up to 13,431,815 shares of Common Stock (appropriately
adjusted to reflect stock splits, stock dividends, combinations of shares and the like with respect to the Common Stock occurring after March 22, 2010) reserved by the Company from time to time for (i) the sale or issuance of shares of
Common Stock to employees, consultants or non-employee directors of the Company or (ii) the issuance and/or exercise of options to purchase Common Stock granted to employees, consultants or non-employee directors of the Company, all pursuant to
arrangements approved by the Board of Directors and the Series A Directors. 
 2. Effect of Amendment. This
Amendment will be effective in accordance with Section 15(d) of the Agreement upon execution by Company, the Investors and the Founders. Except as expressly provided herein and as amended hereby, the Agreement shall remain in full force and
effect in accordance with its terms. 
 3. Counterparts. This Amendment may be executed in counterparts.

 IN WITNESS WHEREOF, the Company, the Investors and the Founders have executed this
Third Amendment to the Sixth Amended and Restated Investor Rights Agreement as of the date first above written. 
 COMPANY:

 KAYAK SOFTWARE CORPORATION 
  

			
	By:	 	 /s/ Daniel Stephen Hafner

	Name:	 	Daniel Stephen Hafner
	Title:	 	Chief Executive Officer

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

 FOUNDERS: 
  

	
	 /s/ Daniel Stephen Hafner

	Daniel Stephen Hafner
	
	 /s/ Paul English

	Paul English

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

 INVESTORS: 
  

									
	GENERAL CATALYST GROUP II, L.P.	 		 	GENERAL CATALYST GROUP III, L.P.
					
	By:	  	General Catalyst Partners II, L.P.	 		 	By:	  	General Catalyst Partners III, L.P.
		  	Its General Partner	 		 		  	Its General Partner
					
	By:	  	General Catalyst GP II, LLC	 		 	By:	  	General Catalyst GP III, LLC
		  	Its General Partner	 		 		  	Its General Partner
					
	By:	  	 /s/ William J. Fitzgerald
	 		 	By:	  	 /s/ William J. Fitzgerald

	Name:	  	William J. Fitzgerald	 		 	Name:	  	William J. Fitzgerald
	Title:	  	Member and Chief Financial Officer	 		 	Title:	  	Member and Chief Financial Officer
			
	GC ENTREPRENEURS FUND II, L.P.	 		 	GC ENTREPRENEURS FUND III, L.P.
					
	By:	  	General Catalyst Partners II, L.P.	 		 	By:	  	General Catalyst Partners III, L.P.
		  	Its General Partner	 		 		  	Its General Partner
					
	By:	  	General Catalyst GP II, LLC	 		 	By:	  	General Catalyst GP III, LLC
		  	Its General Partner	 		 		  	Its General Partner
					
	By:	  	 /s/ William J. Fitzgerald
	 		 	By:	  	 /s/ William J. Fitzgerald

	Name:	  	William J. Fitzgerald	 		 	Name:	  	William J. Fitzgerald
	Title:	  	Member and Chief Financial Officer	 		 	Title:	  	Member and Chief Financial Officer
			
	GENERAL CATALYST GROUP V, L.P.	 		 	GC ENTREPRENEURS FUND V, L.P.
					
	By:	  	General Catalyst Partners V, L.P.	 		 	By:	  	General Catalyst Partners V, L.P.
		  	Its General Partner	 		 		  	Its General Partner
					
	By:	  	General Catalyst GP V, LLC	 		 	By:	  	General Catalyst GP V, LLC
		  	Its General Partner	 		 		  	Its General Partner
					
	By:	  	 /s/ William J. Fitzgerald
	 		 	By:	  	 /s/ William J. Fitzgerald

	Name:	  	William J. Fitzgerald	 		 	Name:	  	William J. Fitzgerald
	Title:	  	Member and Chief Financial Officer	 		 	Title:	  	Member and Chief Financial Officer
				
	GENERAL CATALYST GROUP V SUPPLEMENTAL, L.P.	 		 		  	
					
	By:	  	General Catalyst Partners V, L.P.	 		 		  	
		  	Its General Partner	 		 		  	
					
	By:	  	General Catalyst GP V, LLC	 		 		  	
		  	Its General Partner	 		 		  	
					
	By:	  	 /s/ William J. Fitzgerald
	 		 		  	
	Name:	  	William J. Fitzgerald	 		 		  	
	Title:	  	Member and Chief Financial Officer	 		 		  	

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

									
	ACCEL LONDON II L.P.	 		 	ACCEL LONDON INVESTORS 2006 L.P.
					
	By:	  	Accel London II Associates L.P.	 		 	By:	  	Accel London II Associates L.L.C.
		  	Its General Partner	 		 		  	Its General Partner
					
	By:	  	Accel London II Associates L.L.C.	 		 		  	
		  	Its General Partner	 		 		  	
					
	By:	  		 		 	By:	  	
	Name:	  	 /s/    Jonathan Biggs
	 		 	Name:	  	 /s/    Jonathan Biggs

	Title:	  	Attorney in Fact	 		 	Title:	  	Attorney in Fact

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

			
	SEQUOIA CAPITAL XI
	SEQUOIA TECHNOLOGY PARTNERS XI
	SEQUOIA CAPITAL XI PRINCIPALS FUND
		
	By:	 	SC XI Management, LLC
		 	A Delaware Limited Liability Company
		 	General Partner of Each
		
	By:	 	 /s/ Michael Moritz

	Name:	 	Michael Moritz
	Title:	 	Managing Member

 SEQUOIA CAPITAL GROWTH FUND III 
 SEQUOIA CAPITAL GROWTH PARTNERS III 
 SEQUOIA CAPITAL GROWTH III PRINCIPALS FUND 

 

			
	By:	 	SCGF III Management, LLC
		 	A Delaware Limited Liability Company
		 	General Partner of Each
		
	By:	 	 /s/ Michael Moritz

	Name:	 	Michael Moritz
	Title:	 	Managing Member

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

	
	  

	Greg Slyngstad

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

	
	 /s/ Daniel Stephen Hafner

	Daniel Stephen Hafner

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

	
	 /s/ Paul English

	Paul English

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

 TRIDENT CAPITAL FUND-V, L.P 
 TRIDENT CAPITAL FUND-V AFFILIATES FUND, L.P. 
 TRIDENT CAPITAL FUND-V AFFILIATES FUND (Q), L.P.

 TRIDENT CAPITAL FUND-V PRINCIPALS FUND, L.P. 
 TRIDENT CAPITAL PARALLEL FUND-V, C.V. 
 Executed on behalf of the foregoing funds 

by the undersigned, as an authorized signatory 

of the respective general partner of each such fund: 
  

	
	  

	    (signature)
	
	  

	    (print name)

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

									
	NORWEST VENTURE PARTNERS VII-A, LP	  		  	NORWEST VENTURE PARTNERS X, LP
					
	By:	 	Itasca VC Partners VII-A, LLC	  		  	By:	 	Genesis VC Partners X, LLC
		 	Its General Partner	  		  		 	Its General Partner
					
	By:	 	  
	  		  	By:	 	  

	Name:	 	  
	  		  	Name:	 	  

	Title:	 	  
	  		  	Title:	 	  

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

			
	OAK INVESTMENT PARTNERS XII, LIMITED PARTNERSHIP

			
		
	By:	 	Oak Associates XII, LLC, its General Partner
		
	By:	 	 /s/ Iftikar A. Ahmed

	Name:	 	Iftikar A. Ahmed
	Title:	 	Managing Member

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

			
	TENAYA CAPITAL V, L.P.
		
	By:	 	Tenaya Capital V GP, L.P., its General Partner
		
	By:	 	Tenaya Capital V GP, LLC, its General Partner
		
	By:	 	  

	Name:	 	  

	Title:	 	  

	
	TENAYA CAPITAL V-P, L.P.
		
	By:	 	Tenaya Capital V GP, L.P., its General Partner
		
	By:	 	Tenaya Capital V GP, LLC, its General Partner
		
	By:	 	  

	Name:	 	  

	Title:	 	  

	
	TENAYA CAPITAL B, LP
		
	By:	 	  

		
	By:	 	  

		
	By:	 	  

	Name:	 	  

	Title:	 	  

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

			
	GOLDHILL VENTURE LENDING 03, L.P.
		
	By:	 	  

	Name:	 	
	Title:	 	

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

 Schedule I 
 Investors: 
 General Catalyst Group II, L.P. 

GC Entrepreneurs Fund II, L.P. 
 General Catalyst
Group III, L.P. 
 GC Entrepreneurs Fund III, L.P. 
 General Catalyst Group V, L.P. 
 General Catalyst Group V Supplemental, L.P. 

GC Entrepreneurs Fund V, L.P. 
 20 University
Road, Suite 450 
 Cambridge, MA 02138 

Fax: (617) 234-7040 
 Attn: Joel Cutler

 Sequoia Capital Growth Fund III 

Sequoia Capital Growth Partners III 
 Sequoia
Capital Growth III Principals Fund 
 Sequoia Capital XI 
 Sequoia Technology Partners XI 
 Sequoia Capital XI Principals Fund 

3000 Sand Hill Road 
 Bldg 4, Suite 180

 Menlo Park, CA 94025 
 Daniel
Stephen Hafner 
 [ADDRESS] 
 Paul
English 
 [ADDRESS] 
 Greg Slyngstad

 [ADDRESS] 

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

 Accel London II, L.P. 
 Accel London Investors 2006 L.P. 
 428 University Avenue 

Palo Alto, CA 94301-1812 
 Fax:
(650) 614-4880 
 Attn: Richard Zamboldi 
 Notices also sent to 
 Accel Partners 
 16 St. James’s Street 
 London SW1A 1ER 

United Kingdom 
 Fax: +44 (0) 20 7170 1099

 Attn: Jonathan Biggs 
 Attn: Harry
Nelis 
 Norwest Venture Partners VII-A 

Norwest Venture Partners X, LP 
 525 University
Avenue 
 Palo Alto, Ca. 94301 

650.321.8000 
 Oak Investment Partners XII,
Limited Partnership 
 One Gorham Island 

Westport, CT 06880 
 Attn: Iftikar A. Ahmed

 Tenaya Capital V, L.P. 
 Tenaya
Capital V-P, L.P. 
 Tenaya Capital B, LP 
 2965 Woodside Road, Suite A 
 Woodside, California 94062 

Trident Capital Fund-V, L.P 
 Trident Capital
Fund-V Affiliates Fund, L.P. 
 Trident Capital Fund-V Affiliates Fund (Q), L.P. 
 Trident Capital Fund-V Principals Fund, L.P. 
 Trident Capital Parallel Fund-V, C.V. 

505 Hamilton Ave, Suite 200 
 Palo Alto, CA 94301

 Gold Hill Venture Lending 03, L.P. 

35 Braintree Hill Park, Suite 301 
 Braintree, MA
02138 
 The Paul M. English 2009 Charitable Remainder Unitrust I 
 [ADDRESS] 
 The Paul M. English 2009 Charitable Remainder Unitrust II 

[ADDRESS] 

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

 The English Family 2010 Trust 
 [ADDRESS] 
 Lee Baldwin 
 [ADDRESS] 

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement 

 Founders: 
 Daniel Stephen Hafner 
 [ADDRESS] 
 Paul English 
 [ADDRESS] 

  
 Signature Page
to the 3rd Amendment to the Investor Rights Agreement

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