EX-4.1





 Exhibit 4.1 
  





 
 NUMBER BB LI 
Lyell Lyell Immunopharma, Inc. LYELL
IMMUNOPHARMA, INC. 
SHARES 
CUSIP 097702 10 4 
INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
SEE REVERSE FOR CERTAIN DEFINITIONS AND
LEGENDS 
This certifies that 
is the record holder of 
FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $0.00001 PAR VALUE PER SHARE, OF

transferable on the books of the Corporation 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 Corporation and the facsimile signatures of its
duly authorized officers. 
Dated: 
CHIEF EXECUTIVE OFFICER 
BOLT BIOTHERAPEUTICS, INC. 
CORPORATE SEAL 
JANUARY 22, 2015 
DELAWARE 
SECRETARY 
COUNTERSIGNED AND REGISTERED: 
AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC 
(BROOKLYN, NY) 
TRANSFER AGENT AND REGISTRAR 
BY: 
AUTHORIZED SIGNATURE 












 The Corporation shall furnish without charge to each stockholder who so requests a statement
of the powers, designations, preferences and relative, participating, optional or other special rights of each class of stock of the Corporation or series thereof and the qualifications, limitations or restrictions of such preferences and/or rights.
Such requests shall be made to the Corporation’s Secretary at the principal office of the Corporation. 
 KEEP THIS CERTIFICATE IN A
SAFE PLACE. IF IT IS LOST, STOLEN,OR DESTROYED THE CORPORATION WILL REQUIRE A BOND INDEMNITY AS A CONDITION TO THE ISSUANCE OF A REPLACEMENT 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	 	                
	TEN ENT	  	–	  	as tenants by the entireties	  		  		 		  	(Cust)	  		 	(Minor)
	JT TEN	  	–	  	as joint tenants with right of	  		  		 		  	under Uniform Gifts to Minors
		  		  	survivorship and not as tenants	  		  		 		  	Act                                   
                   
		  		  	in common	  		  		 		  	(State)
	COM PROP	  	–	  	as community property	  		  	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(s), assign(s) and transfer(s) 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 capital stock represented by within Certificate, and do hereby irrevocably
constitute and appoint


  

							
	 	  	 attorney-in-fact

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


  

					
	 Dated
                                         
                                         
  


  

							
	 	  	X	  	  

	 	  	X	  	  

	Signature(s) Guaranteed:	  		  	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 WHATSOEVER.

  

	
	
	By
                                         
                                         
                                         
                                         
      
	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. GUARANTEES BY A NOTARY PUBLIC ARE NOT
ACCEPTABLE. SIGNATURE GUARANTEES MUST NOT BE DATED.