FORM 8.3

               PUBLIC OPENING POSITION DISCLOSURE/DEALING DISCLOSURE BY            

        A PERSON WITH INTERESTS IN RELEVANT SECURITIES REPRESENTING 1% OR MORE     

                      Rule 8.3 of the Takeover Code (the "Code")                   

    1.         KEY INFORMATION

    (a) Identity of the person whose positions/dealings  HBK Investments L.P. on behalf of 
    are being disclosed:                                 itself, its subadvisors and its   
                                                         managed funds                     
                                                                                           
    (b) Owner or controller of interests and short       N/A                               
    positions disclosed, if different from 1(a):                                           
         The naming of nominee or vehicle companies is                                     
    insufficient                                                                           
                                                                                           
    (c) Name of offeror/offeree in relation to whose     ARM Holdings Plc                  
    relevant securities this form relates:                                                 
         Use a separate form for each offeror/offeree                                      
                                                                                           
    (d) If an exempt fund manager connected with an                                        
    offeror/offeree, state this and specify identity of                                    
    offeror/offeree:                                                                       
                                                                                           
    (e) Date position held/dealing undertaken:           27th July 2016                    
                                                                                           
    (f)  Has the discloser previously disclosed, or are  NO                                
    they today disclosing, under the Code in respect of                                    
    any other party to this offer?                                                         

    2.         POSITIONS OF THE PERSON MAKING THE DISCLOSURE

    (a)        Interests and short positions in the relevant securities of the
    offeror or offeree to which the disclosure relates following the dealing (if
    any)

    Class of relevant security:              0.05p Ordinary Shares (ISIN: GB0000595859)      
                                                                                             
                                                Interests               Short positions      
                                                                                             
                                              Number          %          Number          %   
                                                                                             
    (1) Relevant securities owned and/          100         0.000                            
    or controlled:                                                                           
                                                                                             
    (2) Derivatives (other than             16,837,680      1.196                            
    options):                                                                                
                                                                                             
    (3) Options and agreements to             100,000       0.007       1,025,000      0.073 
    purchase/sell:                                                                           
                                                                                             
                                            16,937,780      1.203       1,025,000      0.073 
         TOTAL:                                                                              

    All interests and all short positions should be disclosed.

    Details of any open derivative or option positions, or agreements to purchase
    or sell relevant securities, should be given on a Supplemental Form 8 (Open
    Positions).

    (b)        Rights to subscribe for new securities (including directors' and
    other executive options)

    Class of relevant security in relation to                                              
    which subscription right exists:                                                       
                                                                                           
    Details, including nature of the rights                                                
    concerned and relevant percentages:                                                    

    If there are positions or rights to subscribe to disclose in more than one
    class of relevant securities of the offeror or offeree named in 1(c), copy
    table 2(a) or (b) (as appropriate) for each additional class of relevant
    security.

    3.         DEALINGS (IF ANY) BY THE PERSON MAKING THE DISCLOSURE

    (a)        Purchases and sales

      Class of relevant       Purchase/sale     Number of securities     Price per unit    
          security                                                                         
                                                                                           

    (b)        Derivatives transactions (other than options)

    Class of relevant      Product        Nature of dealing      Number of    Price per unit
         security        description   e.g. opening/closing a    reference                  
                          e.g. CFD      long/short position,     securities                 
                                        increasing/reducing a                               
                                         long/short position                                
                                                                                            
                                                                                            
      0.05p ordinary    Total Return       Increasing Long        136,523      GBP 16.7720  
                            Swap                                                            
                                                                                            
      0.05p ordinary    Total Return       Increasing Long         97,516      GBP 16.7684  
                            Swap                                                            
                                                                                            
      0.05p ordinary    Total Return       Increasing Long        156,026      GBP 16.7583  
                            Swap                                                            
                                                                                            
      0.05p ordinary    Total Return       Increasing Long        213,477      GBP 16.7720  
                            Swap                                                            
                                                                                            
      0.05p ordinary    Total Return       Increasing Long        152,484      GBP 16.7684  
                            Swap                                                            
                                                                                            
      0.05p ordinary    Total Return       Increasing Long        243,974      GBP 16.7583  
                            Swap                                                            
                                                                                            
                                                                                            

    (c)        Options transactions in respect of existing securities

    (i)         Writing, selling, purchasing or varying

    Class of    Product      Writing,     Number of  Exercise     Type     Expiry   Option  
    relevant  description   purchasing,  securities  price per    e.g.      date     money  
    security   e.g. call     selling,     to which     unit    American,             paid/  
                 option    varying etc.    option               European           received 
                                           relates                etc.             per unit 
                                                                                            

    (ii)        Exercising

      Class of relevant    Product description  Number of securities   Exercise price per  
          security          e.g. call option                                  unit         
                                                                                           

    (d)        Other dealings (including subscribing for new securities)

     Class of relevant       Nature of dealing             Details        Price per unit (if
         security            e.g. subscription,                              applicable)    
                                 conversion                                                 
                                                                                            

    The currency of all prices and other monetary amounts should be stated.

    Where there have been dealings in more than one class of relevant securities of
    the offeror or offeree named in 1(c), copy table 3(a), (b), (c) or (d) (as
    appropriate) for each additional class of relevant security dealt in.

    4.         OTHER INFORMATION

    (a)        Indemnity and other dealing arrangements

    Details of any indemnity or option arrangement, or any agreement or                    
    understanding, formal or informal, relating to relevant securities which may be        
    an inducement to deal or refrain from dealing entered into by the person making        
    the disclosure and any party to the offer or any person acting in concert with         
    a party to the offer:                                                                  
    If there are no such agreements, arrangements or understandings, state "none"          
                                                                                           
                                                                                           
                                                                                           

    (b)        Agreements, arrangements or understandings relating to options or
    derivatives

    Details of any agreement, arrangement or understanding, formal or informal,            
    between the person making the disclosure and any other person relating to:             
    (i)  the voting rights of any relevant securities under any option; or                 
    (ii) the voting rights or future acquisition or disposal of any relevant               
    securities to which any derivative is referenced:                                      
    If there are no such agreements, arrangements or understandings, state "none"          
                                                                                           
                                                                                           
                                                                                           

    (c)        Attachments

    Is a Supplemental Form 8 (Open Positions) attached?                          YES       

       

    Date of disclosure:                         28th July 2016                             
                                                                                           
    Contact name:                               Jonathan Brown                             
                                                                                           
    Telephone number:                           +44 (0)20 7659 1906                        

    Public disclosures under Rule 8 of the Code must be made to a Regulatory
    Information Service and must also be emailed to the Takeover Panel at 
    monitoring@disclosure.org.uk.  The Panel's Market Surveillance Unit is
    available for consultation in relation to the Code's dealing disclosure
    requirements on +44 (0)20 7638 0129.

    The Code can be viewed on the Panel's website at www.thetakeoverpanel.org.uk.

                                               SUPPLEMENTAL FORM 8 (OPEN POSITIONS)

        DETAILS OF OPEN STOCK-SETTLED DERIVATIVE (INCLUDING OPTION) POSITIONS,     
                          AGREEMENTS TO PURCHASE OR SELL ETC.                      

                 Note 5(i) on Rule 8 of the Takeover Code (the "Code")             

    1.         KEY INFORMATION

    Full name of person making disclosure:               HBK Investments L.P. on behalf of 
                                                         itself, its subadvisors and its   
                                                         managed funds                     
                                                                                           
    Name of offeror/offeree in relation to whose         ARM Holdings Plc                  
    relevant securities the disclosure relates:                                            

    2.         STOCK-SETTLED DERIVATIVES (INCLUDING OPTIONS)

     Class of      Product     Written or     Number of    Exercise     Type     Expiry date
     relevant    description    purchased   securities to price per     e.g.                
     security     e.g. call                 which option     unit     American,             
                   option                   or derivative             European              
                                               relates                  etc.                
                                                                                            
                                                                                            
    0.05p       Call option   Written       25,000        GBP 17     American    16/09/16   
    ordinary                                                                                
                                                                                            
    0.05p       Put option    Written       100,000       GBP 17     American    16/09/16   
    ordinary                                                                                
                                                                                            
    0.05p       Call option   Written       1,000,000     GBP 17     American    16/09/16   
    ordinary                                                                                
                                                                                            
                                                                                            
                                                                                            

    3.         AGREEMENTS TO PURCHASE OR SELL ETC.

    Full details should be given so that the nature of the interest or     
    position can be fully understood:                                      
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           

    It is not necessary to provide details on a Supplemental Form (Open Positions)
    with regard to cash-settled derivatives.

    The currency of all prices and other monetary amounts should be stated.

    The Panel's Market Surveillance Unit is available for consultation in relation
    to the Code's disclosure requirements on +44 (0)20 7638 0129.

    The Code can be viewed on the Panel's website at www.thetakeoverpanel.org.uk.