Form of Registrant's Class A Common Stock Certificate



 Exhibit 4.1 

 
 



 
 016570| 003590|127C|RESTRICTED||4|057-423 

CLASS A COMMON STOCK 
 PAR VALUE $0.001 
 CLASS A COMMON STOCK 

THIS CERTIFICATE IS TRANSFERABLE IN CANTON, MA AND NEW YORK, NY 

PO BOX 43004, Providence, RI 02940-3004 
 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 
 CUSIP Holder ID 
 Insurance Value Number of Shares
DTC 
 Certificate Numbers 
 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 

Total Transaction 
 XXXXXX XX X XXXXXXXXXX 
 00.1,000,000 123456
12345678901234512345678 
 Num/No Denom. Total. 

111 222 333 444 555 666 
 7 
 Certificate Number 

ZQ 000000 
 THIS CERTIFIES THAT 
 is the owner of 

KAYAK SOFTWARE CORPORATION 
 INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
 Shares 
 * * 0 0 0 0 0 0 * * * * * * 

* * * 0 0 0 0 0 0 * * * * * 
 * * * * 0 0 0 0 0 0 * * * * 
 * * * * * 0 0 0 0 0 0
* * * 
 * * * * * * 0 0 0 0 0 0 * * 
 ** 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****000 

000**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 
 CUSIP 486577 10 9 
 SEE REVERSE FOR CERTAIN
DEFINITIONS 
 FULLY-PAID AND NON-ASSESSABLE SHARES OF THE CLASS A 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 
 1234567 

Secretary 
 President 







 



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

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

Dated: 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.