TR-1: Notifications of Major Interests in Shares                                     
                                                                                         
                                                                                         
    1. Identity of the issuer or the underlying       Elementis PLC                      
    issuer of existing shares to which voting rights                                     
    are attached:                                                                        
                                                                                         
                                                                                         
    2. Reason for notification (yes/no)                                                  
                                                                                         
                                                                            Yes          
    An acquisition or disposal of voting rights                                          
                                                                                         
                                                                            No           
    An acquisition or disposal of financial instruments which may result in              
    the acquisition of shares already issued to which voting rights are                  
    attached                                                                             
                                                                                         
                                                                            No           
    An acquisition or disposal of instruments with similar economic effect               
    to qualifying financial instruments                                                  
                                                                                         
                                                                            No           
    An event changing the breakdown of voting rights                                     
                                                                                         
                                                                            No           
    Other (please specify):___________________________                                   
                                                                                         
                                              Ameriprise Financial, Inc. and its group   
    3. Full name of person(s) subject to                                                 
    notification obligation:                                                             
                                                                                         
                                              State Street Nominees Limited              
    4. Full name of shareholder(s) (if        Nortrust Nominees LTD                      
    different from 3):                        Vidacos Nominees Ltd                       
                                              HSBC Global Custody Nominee (UK) Limited   
                                              Chase Nominees Ltd                         
                                                                                         
                                              25 January 2016                            
    5. Date of transaction and date on which                                             
    the threshold is crossed or reached:                                                 
                                                                                         
                                              26 January 2016                            
    6. Date on which issuer notified:                                                    
                                                                                         
                                              Below the threshold of 5%                  
    7. Threshold(s) that is/are crossed or                                               
    reached:                                                                             
                                                                                         

       

    8: Notified Details                                                                                                                                                           
                                                                                                                                                                                  
    A: Voting rights attached to shares                                                                                                                                           
                                                                                                                                                                                  
    Class/type of shares               Situation previous to the triggering        Resulting situation after the triggering transaction                                           
    If possible use ISIN code          transaction                                                                                                                                
                                                                                                                                                                                  
                                       Number of shares       Number of voting     Number of shares         Number of voting rights             Percentage of voting rights       
                                                              rights                                                                                                              
                                                                                                                                                                                  
                                                                                   Direct                   Direct             Indirect         Direct         Indirect           
                                                                                                                                                                                  
    GB0002418548     25,715,290 25,715,290 134,373   134,373    22,642,333 0.029%                      4.891%                                                                     
                                                                                                                                                                                  

       

    B: Qualifying Financial Instruments                                            
                                                                                   
    Resulting situation after the triggering transaction                           
                                                                                   
    Type of         Expiration date Exercise/       No. of voting   Percentage of  
    financial                       conversion      rights that may voting rights  
    instrument                      period          be acquired if                 
                                                    the instrument                 
                                                    is exercised/                  
                                                    converted.                     
                                                                                   

       

    C: Financial Instruments with similar economic effect to Qualifying Financial   
    Instruments                                                                     
                                                                                    
    Resulting situation after the triggering transaction                            
                                                                                    
    Type of      Exercise  Expiration Exercise /  No. of voting   Percentage of     
    financial    Price     date       conversion  rights          voting rights     
    instrument                        period      instrument                        
                                                  refers to                         
                                                                                    
                                                                  Nominal     Delta 
                                                                                    

       

    Total (A+B+C)                                                                
                                                                                 
    Number of voting rights                Percentage of voting rights           
                                                                                 
    22,776,706                             4.920%                                

       

    9. Chain of controlled undertakings through which the voting rights and /or  
    the financial instruments are effectively held, if applicable:               
                                                                                 
    Threadneedle Asset Management Limited (4.001%)                               
    Columbia Management Investment Advisers, LLC (0.051%)                        
    Columbia Wanger Asset Management, LLC (0.868%)                               
                                                                                 
    Columbia Wanger Asset Management, LLC is wholly owned by Columbia Management 
    Investment Advisers, LLC, which is itself wholly owned by Ameriprise         
    Financial, Inc.                                                              
                                                                                 
    Threadneedle Asset Management Limited is wholly owned by TC Financing        
    Limited, which is itself wholly owned by Threadneedle Asset Management       
    Holdings Limited, which is itself wholly owned by TAM UK Holdings Limited,   
    which is itself wholly owned by Threadneedle Holdings Limited,  which is     
    itself wholly owned by Threadneedle Asset Management Holdings SARL, which is 
    itself wholly owned by Ameriprise International Holdings GmbH, which is      
    itself wholly owned by Ameriprise Financial, Inc.                            

       

    Proxy Voting:                                                                
                                                                                 
    10. Name of proxy holder:              N/A                                   
                                                                                 
    11. Number of voting rights proxy      N/A                                   
    holder will cease to hold:                                                   
                                                                                 
    12. Date on which proxy holder will    N/A                                   
    cease to hold voting rights:                                                 

       

    13. Additional information:            The Shares referred to in section 9 of
                                           this form are held in portfolios and  
                                           funds managed on a discretionary basis
                                           by the entities set out in section 9. 
                                           Please note that the Shares are held  
                                           through certain nominee companies.    
                                                                                 
    14 Contact name:                       Mark Powney, Threadneedle Asset       
                                           Management Ltd.                       
                                                                                 
    15. Contact telephone name:            +44 (0) 1793 363 135                  

    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

    27 January 2016