Document:

Specimen of Stock Certificate evidencing shares of Common Stock

 Exhibit 4.1 

	
	

  

Exhibit 4.1 
 See Legends on Reverse 
 Incorporated Under the
Laws of the State of Delaware 
 KaloBios Pharmaceuticals, Inc. 

This Certifies that <<Stockholder>> is the registered holder of <<SharesText>>
(<<SharesNo>>) Shares of Common Stock transferable only on the books of the Corporation by the holder hereof in person or by Attorney upon surrender of this Certificate properly endorsed. 

In Witness Whereof, the said Corporation has caused this Certificate to be signed by its duly authorized officers this
<<Day>> day of <<Month>> A.D. <<YEAR>>. 
 Secretary or Assistant Secretary

 President or Vice President 
 COMMON 

 

 
  
 THE SHARES
REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, ENCUMBERED OR IN ANY MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN
INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY CERTAIN RIGHTS OF FIRST REFUSAL UPON AN ATTEMPTED TRANSFER OF THE SHARES. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE HOLDER HEREOF
WITHOUT CHARGE. 
 THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED. 

For Value Received, hereby sell, assign and transfer unto 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 Corporation with full power of substitution in the premises. Dated 20 
 In presence of 
 NOTICE. THE SIGNATURE OF 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.Specimen of Stock Certificate evidencing shares of Series B-1 Preferred Stock

 Exhibit 4.2 

	
	

  

Exhibit 4.2 
 See Legends on Reverse 
 Incorporated Under the
Laws of the State of Delaware 
 KALOBIOS PHARMACEUTICALS,
INC. 
 This Certifies that <<Stockholder>> is the registered holder of
<<SharesText>> (<<SharesNo>>) Shares of Series B-1 Preferred Stock transferable only on the books of the Corporation by the holder hereof in person or by Attorney upon surrender of this Certificate properly endorsed.

 In Witness Whereof, the said Corporation has caused this Certificate to be signed by its duly authorized
officers this <<Day>> day of <<Month>> A.D. <<YEAR>>. 
 PREFERRED

 Secretary or Assistant Secretary 
 President or Vice President 

 

 
  
 THE SHARES
REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE
COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED. 
 For Value Received, hereby sell, assign and
transfer unto 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 Corporation with full power of substitution in the premises. Dated 20

 In presence of 
 NOTICE. THE SIGNATURE OF 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.Specimen of Stock Certificate evidencing shares of Series B-2 Preferred Stock

 Exhibit 4.3 

	
	

  

Exhibit 4.3 
 See Legends on Reverse 
 Incorporated Under the
Laws of the State of Delaware 
 KALOBIOS PHARMACEUTICALS,
INC. 
 This Certifies that <<Stockholder>> is the registered holder of
<<SharesText>> (<<SharesNo>>) Shares of Series B-2 Preferred Stock transferable only on the books of the Corporation by the holder hereof in person or by Attorney upon surrender of this Certificate properly endorsed.

 In Witness Whereof, the said Corporation has caused this Certificate to be signed by its duly authorized
officers this <<Day>> day of <<Month>> A.D. <<YEAR>>. 
 PREFERRED

 Secretary or Assistant Secretary 
 President or Vice President 

 

 
  
 THE SHARES
REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE
COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED. 
 For Value Received, hereby sell, assign and
transfer unto 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 Corporation with full power of substitution in the premises. Dated 20

 In presence of 
 NOTICE. THE SIGNATURE OF 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.Specimen of Stock Certificate evidencing shares of C Preferred Stock

 Exhibit 4.4 

	
	

  

Exhibit 4.4 
 See Legends on Reverse 
 Incorporated Under the
Laws of the State of Delaware 
 KALOBIOS PHARMACEUTICALS,
INC. 
 This Certifies that <<Stockholder>> is the registered holder of
<<SharesText>> (<<SharesNo>>) Shares of Series C Preferred Stock transferable only on the books of the Corporation by the holder hereof in person or by Attorney upon surrender of this Certificate properly endorsed.

 In Witness Whereof, the said Corporation has caused this Certificate to be signed by its duly authorized
officers this <<Day>> day of <<Month>> A.D. <<YEAR>>. 
 PREFERRED

 Secretary or Assistant Secretary 
 President or Vice President 

 

 
  
 THE SHARES
REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE
COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED. 
 For Value Received, hereby sell, assign and
transfer unto 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 Corporation with full power of substitution in the premises. Dated 20

 In presence of 
 NOTICE. THE SIGNATURE OF 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.Specimen of Stock Certificate evidencing shares of D Preferred Stock

 Exhibit 4.5 

	
	

  

Exhibit 4.5 
 See Legends on Reverse 
 Incorporated Under the
Laws of the State of Delaware 
 KALOBIOS PHARMACEUTICALS,
INC. 
 This Certifies that <<Stockholder>> is the registered holder of
<<SharesText>> (<<SharesNo>>) Shares of Series D Preferred Stock transferable only on the books of the Corporation by the holder hereof in person or by Attorney upon surrender of this Certificate properly endorsed.

 In Witness Whereof, the said Corporation has caused this Certificate to be signed by its duly authorized
officers this <<Day>> day of <<Month>> A.D. <<YEAR>>. 
 PREFERRED

 Secretary or Assistant Secretary 
 President or Vice President 

 

 
  
 THE SHARES
REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE
COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED. 
 For Value Received, hereby sell, assign and
transfer unto 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 Corporation with full power of substitution in the premises. Dated 20

 In presence of 
 NOTICE. THE SIGNATURE OF 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.Specimen of Stock Certificate evidencing shares of E Preferred Stock

 Exhibit 4.6 

	
	

  

Exhibit 4.6 
 See Legends on Reverse 
 Incorporated Under the
Laws of the State of Delaware 
 KALOBIOS PHARMACEUTICALS,
INC. 
 This Certifies that <<Stockholder>> is the registered holder of
<<SharesText>> (<<SharesNo>>) Shares of Series E Preferred Stock transferable only on the books of the Corporation by the holder hereof in person or by Attorney upon surrender of this Certificate properly endorsed.

 In Witness Whereof , the said Corporation has caused this Certificate to be signed by its duly authorized
officers this <<Day>> day of <<Month>> A.D. <<YEAR>>. 
 PREFERRED

 Secretary or Assistant Secretary 
 President or Vice President 

 

 
  
 THE SHARES
REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE
COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED. 
 For Value Received, hereby sell, assign and
transfer unto 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 Corporation with full power of substitution in the premises. Dated 20

 In presence of 
 NOTICE. THE SIGNATURE OF 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.

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