Exhibit
4.1


 




	
  

  	
  By AUTHORIZED
  SIGNATURE THIS CERTIFIES THAT is the owner of CUSIP DATED COUNTERSIGNED AND
  REGISTERED: COMPUTERSHARE TRUST COMPANY, N.A. TRANSFER AGENT AND REGISTRAR,
  FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF Ikaria, Inc. (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. COMMON STOCK PAR VALUE $0.01
  COMMON STOCK THIS CERTIFICATE IS TRANSFERABLE IN CANTON, MA AND NEW YORK, NY
  SEE REVERSE FOR CERTAIN DEFINITIONS Certificate Number Shares . IKARIA, INC.
  INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE Chairman and Chief
  Executive Officer Secretary 016570| 003590|127C|RESTRICTED||4|057-423 45173V
  10 7 <<Month Day, Year>> * * 600620* * * * * * * * * 600620* * *
  * * * * * * 600620* * * * * * * * * 600620* * * * * * * * * 600620* * ** 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
  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 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 David Sample **** Mr.
  Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander
  David Sample **** Mr. Sample **** Mr. Sample
  **600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares***
  *600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****
  600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****6
  00620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****60
  0620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600
  620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares***600620**Shares****600620**Shares****60062
  0**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620
  **Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620*
  *Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**
  Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**S
  hares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Shares****600620**Sh
  * * * SIX HUNDRED THOUSAND SIX HUNDRED AND TWENTY* * * MR. SAMPLE & MRS.
  SAMPLE & MR. SAMPLE & MRS. SAMPLE ZQ 000000 SEAL 2006 DELAWARE
  IKARIA, INC.

  






 















	
  

  	
  For value
  received, hereby sell, assign and transfer unto Shares 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.
  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 common stock represented by the within Certificate, and do hereby
  irrevocably constitute and appoint to transfer the said stock on the books of
  the within-named Company with full power of substitution in the premises. .
  IKARIA, INC. 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.
  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. 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.