EX-4.1



 Exhibit 4.1 
  





 
 016570| 003590| 127C| RESTRICTED||4|057-423 
COMMON
STOCK 
PAR VALUE $.001 
COMMON STOCK 
THIS CERTIFICATE IS TRANSFERABLE IN CANTON, MA, JERSEY CITY, NJ AND 
COLLEGE STATION, TX

Certificate Number 
ZQ 000000 
Shares 
** 000000****** 
*** 000000***** 
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ARIAD PHARMACEUTICALS, INC. 
INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
THIS CERTIFIES THAT 
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Alexander. David Sample Mr**** Alexander. David Sample Mr**** Alexander. David Sample Mr**** Alexander. David Sample Mr**** Alexander. David Sample Mr****Alexander. David SampleMr****Alexander. David Sample Mr**** Alexander. David Sample Mr****
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CUSIP 04033A 10 0 
SEE
REVERSE FOR CERTAIN DEFINITIONS 
is the owner of

**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 HUNDRED***ZERO 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 
FULLY PAID AND
NON-ASSESSABLE SHARES OF THE COMMON STOCK, $.001 PAR VALUE, OF 
ARIAD Pharmaceuticals, Inc transferable only on the books of the Corporation by the holder hereof in
person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate and the shares of Common Stock represented hereby are received and held subject to the laws of the State of Delaware and to the Certificate
of Incorporation and the Bylaws of the Corporation, each as from time to time amended, and the owner of this certificate by accepting the same expressly assents thereto This certificate is not valid unless countersigned by the Transfer Agent.

IN WITNESS WHEREOF, the Corporation has caused this certificate to be signed by the facsimile signatures of its duly authorized officers and a facsimile of its
corporate seal to be hereunto affixed. 
DATED <<Month Day, Year>>

COUNTERSIGNED AND REGISTERED: 
COMPUTERSHARE TRUST COMPANY, N .A 
TRANSFER AGENT AND REGISTRAR, 
Chairman and Chief Executive Officer 
Senior Vice President and Chief Financial Officer 
ARIAD PHARMACEUTICALS, INC. 
CORPORATE SEAL 1991 
DELAWARE 
* 
By

Senior Vice President and Chief Financial Officer 
AUTHORIZED SIGNATURE

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 1,000,000.00 
Number of Shares 123456 
DTC 12345678 123456789012345 
Certificate Numbers Num/No. Denom. Total. 
1234567890/1234567890 1 1 1 1234567890/1234567890 2
2 2 1234567890/1234567890 3 3 3 1234567890/1234567890 4 4 4 1234567890/1234567890 5 5 5 1234567890/1234567890 6 6 6 
Total Transaction 7 
1234567 







 



 
 This certificate also evidences and entitles the holder hereof to certain Rights as set forth in a Rights Agreement dated as of October
31, 2013 (as it may be amended from time to time (the “Rights Agreement”)), between ARIAD PHARMACEUTICALS, INC. (the “Company”) and COMPUTERSHARE TRUST COMPANY, N.A., as Rights Agent (the “Rights Agent”), the terms of
which (including restrictions on the transfer of such Rights) are hereby incorporated herein by reference and a copy of which is on file at the principal executive offices of the Company. Under certain circumstances, as set forth in the Rights
Agreement, such Rights shall be evidenced by separate certificates and shall no longer be evidenced by this certificate. The Company shall mail to the holder of this certificate a copy of the Rights Agreement without charge after receipt of a
written request therefor. RIGHTS THAT ARE OR WERE, AT ANY TIME ON OR AFTER THE DATE AN ACQUIRING PERSON BECOMES SUCH, BENEFICIALLY OWNED BY SUCH ACQUIRING PERSON OR ANY AFFILIATE OR ASSOCIATE OF SUCH ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN
THE RIGHTS AGREEMENT) AND BY ANY SUBSEQUENT HOLDER OF SUCH RIGHTS ARE NULL AND VOID AND NONTRANSFERABLE. 
ABBREVIATIONS 
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) (Minor) under Uniform Transfers to Minors Act. . . . . . . . . .

(State) 
Additional abbreviations may also be used though not in the above
list. 
ASSIGNMENT 
PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF
ASSIGNEE 
For value received, ____________________________hereby sell, assign and transfer unto 
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) 
Shares of
the 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 Corporation with full power of substitution in the premises. 
Dated:
__________________________________________20__________________ Signature(s) Guaranteed: Medallion Guarantee Stamp 
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN
ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan Associations and Credit Unions) WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. 
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 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. 
SECURITY INSTRUCTIONS 
THIS IS WATERMARKED PAPER DO NOT ACCEPT WITHOUT NOTING 
WATERMARK HOLD TO LIGHT TO VERIFY WATERMARK