TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES                                                      
                                                                                                        
    1. Identity of the issuer or the underlying issuer      Elementis PLC                               
    of existing shares to which voting rights are                                                       
    attached:                                                                                           
                                                                                                        
    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 the                          BlackRock, Inc.                   
    notification obligation:                                                                            
                                                                                                        
    4. Full name of shareholder(s)                                                                      
     (if different from 3.):                                                                            
                                                                                                        
    5. Date of the transaction and date on                            7 December, 2016                  
    which the threshold is crossed or                                                                   
    reached:                                                                                            
                                                                                                        
    6. Date on which issuer notified:                                 8 December, 2016                  
                                                                                                        
    7. Threshold(s) that is/are crossed or                                                              
    reached:                                            Voting rights attached to shares holding for    
                                                             BlackRock, Inc. has gone above 5%          
                                                                                                        

       

    8. Notified details:                                                                                 
                                                                                                         
    A: Voting rights attached to shares                                                                  
                                                                                                         
    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     
    the ISIN CODE    of           of           of shares   rights                                        
                     Shares       Voting                                                                 
                                  Rights       Direct      Direct     Indirect   Direct       Indirect   
                                                                                                         
    GB0002418548     20,395,268   20,395,268   N/A         N/A        23,203,840 N/A          5.00%      
                                                                                                         
    B: Qualifying Financial Instruments                                                                  
                                                                                                         
    Resulting situation after the triggering transaction                                                 
                                                                                                         
    Type of financial       Expiration Exercise/               Number of voting        % of voting       
    instrument              date       Conversion Period       rights that may be      rights            
                                                               acquired if the                           
                                                               instrument is                             
                                                               exercised/ converted.                     
                                                                                                         
    Securities Lending                                         2,723,237               0.58%             
                                                                                                         
    C: Financial Instruments with similar economic effect to Qualifying Financial                        
    Instruments                                                                                          
                                                                                                         
    Resulting situation after the triggering transaction                                                 
                                                                                                         
    Type of financial  Exercise   Expiration Exercise/     Number of voting rights  % of voting rights   
    instrument         price      date       Conversion    instrument refers to                          
                                             period                                                      
                                                                                                         
                                                                                    Nominal      Delta   
                                                                                                         
    Total (A+B+C)                                                                                        
                                                                                                         
    Number of voting rights                          Percentage of voting rights                         
                                                                                                         
    25,927,077                                       5.59%                                               
                                                                                                         

       

    9. Chain of controlled undertakings through which the voting rights and/or the              
    financial instruments are effectively held, if applicable:                                  
                                                                                                
    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:                  BlackRock Regulatory Threshold Reporting Team  
                                                                                                
    14. Contact name:                            Marc-Oliver Lesch                              
                                                                                                
    15. Contact telephone number:                020 7743 3650                                  
                                                                                                

    This notification is made in accordance with Rule 5.8.12 R(1) of the Disclosure
    and Transparency Rules sourcebook.

    Wai Wong
    Company Secretary
    020 7067 2999

    9 December 2016