For filings with the FCA include the annex                                                             
                                                                                                           
    For filings with issuer exclude the annex                                                              
                                                                                                           
    TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                                        
                                                                                                           
    1. Identity of the issuer or the underlying issuer                          Bioventix                  
    of existing shares to which voting rights are                                (Sedol                    
    attached: ii                                                                B4QVDF0)                   
                                                                                                           
    2 Reason for the notification (please tick the appropriate box or boxes):                              
                                                                                                           
    An acquisition or disposal of voting rights                                                      X     
                                                                                                           
    An acquisition or disposal of qualifying financial instruments which may result                        
    in the acquisition of shares already issued to which voting rights are attached                        
                                                                                                           
    An acquisition or disposal of instruments with similar economic effect to                              
    qualifying financial instruments                                                                       
                                                                                                           
    An event changing the breakdown of voting rights                                                       
                                                                                                           
    Other (please                                                                                          
    specify):                                                                                              
                                                                                                           
    3. Full name of person(s) subject to                 CASTLEFIELD FUND PARTNERS LIMITED                 
    the                                                                                                    
    notification obligation: iii                                                                           
                                                                                                           
    4. Full name of shareholder(s)                                                                         
     (if different from 3.):iv                                                                             
                                                                                                           
    5. Date of the transaction and date                                                   9th  January 2017
    on                                                                                                     
    which the threshold is crossed or                                                                      
    reached: v                                                                                             
                                                                                                           
    6. Date on which issuer notified:                                                                      
                                                                 12th January 2017                         
                                                                                                           
    7. Threshold(s) that is/are crossed                                                                  5%
    or                                                                                                     
    reached: vi, vii                                                                                       
                                                                                                           

       

    8. Notified details:                                                                                 
                                                                                                         
    A: Voting rights attached to shares viii, ix                                                         
                                                                                                         
    Class/type of    Situation previous        Resulting situation after the triggering transaction      
    shares           to the triggering                                                                   
                     transaction                                                                         
    if possible                                                                                          
    using            Number       Number       Number      Number of voting      % of  voting rights x   
    the ISIN CODE    of           of           of shares   rights                                        
                     Shares       Voting                                                                 
                                  Rights       Direct      Direct xi  Indirect   Direct       Indirect   
                                                                      xii                                
                                                                                                         
                       250,000      250,000      265,000    265,000                 5.197%               
      GB00B4QVDF07                                                                                       
                                                                                                         
    B: Qualifying Financial Instruments                                                                  
                                                                                                         
    Resulting situation after the triggering transaction                                                 
                                                                                                         
    Type of financial       Expiration Exercise/               Number of voting        % of voting       
    instrument              date xiii  Conversion Period xiv   rights that may be      rights            
                                                               acquired if the                           
                                                               instrument is                             
                                                               exercised/ converted.                     
                                                                                                         
    C: Financial Instruments with similar economic effect to Qualifying Financial                        
    Instruments xv, xvi                                                                                  
                                                                                                         
    Resulting situation after the triggering transaction                                                 
                                                                                                         
    Type of financial  Exercise   Expiration Exercise/     Number of voting rights  % of voting rights   
    instrument         price      date xvii  Conversion    instrument refers to     xix, xx              
                                             period xviii                                                
                                                                                                         
                                                                                    Nominal      Delta   
                                                                                                         
    Total (A+B+C)                                                                                        
                                                                                                         
    Number of voting rights                          Percentage of voting rights                         
                                                                                                         
    265,000                                          5.197%                                              
                                                                                                         

       

    9. Chain of controlled undertakings through which the voting rights and/or the              
    financial instruments are effectively held, if applicable: xxi                              
                                                                                                
    Proxy Voting:                                                                               
                                                                                                
    10. Name of the proxy holder:                                                               
                                                                                                
    11. Number of voting rights proxy holder will cease                                         
    to hold:                                                                                    
                                                                                                
    12. Date on which proxy holder will cease to hold                                           
    voting rights:                                                                              
                                                                                                
                                                                                                
    13. Additional information:                      Percentage based on Issued Share Capital of
                                                                                      5,098,656 
                                                                                                
    14. Contact name:                                                            Richard Vickers
                                                                                                
    15. Contact telephone number:                                                  0161 233 4890
                                                                                                

       

    Note: Annex should only be submitted to the FSA not the issuer                           
                                                                                             
    Annex: Notification of major interests in sharesxxii                                     
                                                                                             
    A: Identity of the persons or legal entity subject to the notification                   
    obligation                                                                               
                                                                                             
    Full name                                                                                
    (including legal form of legal entities)                                                 
                                                                                             
    Contact address                                                                          
    (registered office for legal entities)                                                   
                                                                                             
    Phone number & email                                                                     
                                                                                             
    Other useful information                                                                 
    (at least legal representative for legal                                                 
    persons)                                                                                 
                                                                                             
    B: Identity of the notifier, if applicable                                               
                                                                                             
    Full name                                                                                
                                                                                             
    Contact address                                                                          
                                                                                             
    Phone number & email                                                                     
                                                                                             
    Other useful information                                                                 
    (e.g. functional relationship with the                                                   
    person or legal entity subject to the                                                    
    notification obligation)                                                                 
                                                                                             
    C: Additional information                                                                
                                                                                             
    For notes on how to complete form TR-1 please see the FSA website.