EX-4.1



 Exhibit 4.1 
  






 
 ORDINARY SHARES 
NUMBER

TSE-0001 
ORDINARY SHARES 
SHARES 
TRINSEO TM 
FORMED UNDER THE LAWS OF LUXEMBOURG 
CUSIP L9340P 10 1 
SEE REVERSE FOR CERTAIN DEFINITIONS 
THIS CERTIFIES THAT 
SPECIMEN 
is the record holder of 
FULLY PAID AND NON-ASSESSABLE ORDINARY SHARES, $0.01 PAR VALUE PER SHARE, OF 
Trinseo S.A.

transferable on the books of the Company in person or by duly authorized attorney upon surrender of this Certificate properly endorsed. This Certificate is not
valid until countersigned by the Transfer Agent and registered by the Registrar. 
WITNESS the facsimile seal of the Company and the facsimile signatures of its duly
authorized directors. 
DATED: 
DIRECTOR 
DIRECTOR 
COUNTERSIGNED AND REGISTERED: 
AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC (Brooklyn, N.Y.) 
TRANSFER AGENT AND REGISTRAR

BY 
Authorized Signature 
TRINSEO S.A. 
CORPORATE 
SEAL 
JUNE 3, 2010 
LUXEMBOURG 







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

 
  
  

 

                          
                                         
                                         
                                         
                                         
                                 Shares of the ordinary shares represented by the
within Certificate, and do hereby irrevocably constitute and
appoint                                        
                  

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


			
		 	  

	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.


  

			
	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 S.E.C.
RULE 17Ad-15.