Exhibit 4.1




	
  

  	
  . DELAWARE 1998
  PTC THERAPEUTICS, INC. PTC Therapeutics, Inc. INCORPORATED UNDER THE LAWS OF
  THE STATE OF DELAWARE THIS CERTIFIES THAT IS THE RECORD HOLDER FULLY PAID AND
  NON-ASSESSABLE SHARES OF THE COMMON STOCK, $0.001 PAR VALUE PER SHARE, OF PTC
  Therapeutics, Inc. transferable on the books of the Corporation in person or
  by duly authorized Attorney upon surrender of the Certificate properly
  endorsed. This Certificate is not valid until countersigned and registered by
  the Transfer Agent and Registrar. WITNESS the facsimile seal of the
  Corporation and the facsimile signatures of its duly authorized officers.
  Dated: SEE REVERSE FOR CERTAIN DEFINITIONS CUSIP 69366J 20 0 Countersigned
  and Registered: AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC. (Brooklyn,
  NY) Transfer Agent and Registrar By Authorized Signature ABnote North America
  711 ARMSTRONG LANE COLUMBIA, TENNESSEE 38401 (931) 388-3003 HOLLY GRONER
  931-490-7660 MAY 10, 2013 PTC THERAPEUTICS, INC. WO-6966 FACE Operator: mr
  NEW COLOR: This proof was printed from a digital file or artwork on a
  graphics quality, color laser printer. It is a good representation of the
  color as it will appear on the final product. However, this proof process is
  different from offset printing. It is not an exact color rendition, and the
  final printed product may appear slightly different from the proof due to the
  difference between the dyes and printing ink. PLEASE INITIAL THE APPROPRIATE
  SELECTION FOR THIS PROOF: n OK AS IS n OK WITH CHANGES n MAKE CHANGES AND SEND
  ANOTHER PROOF COLORS SELECTED FOR PRINTING: Border prints in SC-3 Dark Green.
  NOTE: TEXT RECEIVED BY MODEM OR E-MAIL IS NOT PROOFREAD WORD FOR WORD.
  SECRETARY PRESIDENT 

  






 


 












	
  

  	
  ABnote North
  America 711 ARMSTRONG LANE COLUMBIA, TENNESSEE 38401 (931) 388-3003 HOLLY
  GRONER 931-490-7660 PROOF OF: MAY 10, 2013 PTC THERAPEUTICS, INC. WO- 6966
  FACE OPERATOR: MR NEW PLEASE INITIAL THE APPROPRIATE SELECTION FOR THIS
  PROOF: OK AS IS OK WITH CHANGES MAKE CHANGES AND SEND ANOTHER PROOF NOTE:
  TEXT RECEIVED BY MODEM OR E-MAIL IS NOT PROOFREAD WORD FOR WORD. UNIF GIFT
  MIN ACT – Custodian (Cust) (Minor) under Uniform Gifts to Minors Act (State)
  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 TEN ENT JT TEN as
  tenants in common as tenants by the entireties as joint tenants with right of
  survivorship and not as tenants in common Additional abbreviations may also
  be used though not in the above list. – – – 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 Corporation with
  full power of substitution in the premises. Dated For value received, hereby
  sell, assign and transfer unto PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE Shares PLEASE PRINT OR TYPEWRITE NAME AND
  ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE SIGNATURE(S) GUARANTEED: THE
  SIGNATURE(S) MUST 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 SEC RULE
  17Ad-15. 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. NOTICE: Attorney