EX-4.1
        
        
                
                    from 8-K
                
                    
                            109 pages                    
            Proofpoint, Inc. as Issuer Wells Fargo Bank, National Association as Trustee, Note Registrar, Paying Agent, Transfer Agent, Authenticating Agent and Conversion Agent Indenture Dated as of August 23, 2019 0.25% Convertible Senior Notes Due 2024
        
        
                12/34/56
        
            
    
                            
    
        
            EX-4.1
        
        
                
                    from 8-K
                
                    
                            106 pages                    
            Proofpoint, Inc. as Issuer Wells Fargo Bank, National Association as Trustee, Note Registrar, Paying Agent, Transfer Agent, Authenticating Agent and Conversion Agent Indenture Dated as of June 17, 2015 0.75% Senior Convertible Notes Due 2020
        
        
                12/34/56
        
            
    
                            
    
        
            EX-4.1
        
        
                
                    from 8-K
                
                    
                            103 pages                    
            Proofpoint, Inc. as Issuer Wells Fargo Bank, National Association as Trustee, Note Registrar, Paying Agent, Transfer Agent, Authenticating Agent and Conversion Agent Indenture Dated as of December 11, 2013 1.25% Senior Convertible Notes Due 2018
        
        
                12/34/56