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     Equinix Inc                       
    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:           5th October 2015                  
                                                                                           
    (f)  Has the discloser previously disclosed, or are  YES                               
    they today disclosing, under the Code in respect of  If YES, specify which: Telecity   
    any other party to this offer?                       Group Plc                         

    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:            USD 0.001 Ordinary Shares (ISIN: US29444U7000)    
                                                                                             
                                                Interests               Short positions      
                                                                                             
                                              Number          %          Number          %   
                                                                                             
    (1) Relevant securities owned and/                                   181,207       0.3183
    or controlled:                                                                           
                                                                                             
    (2) Derivatives (other than                                          51,235        0.0900
    options):                                                                                
                                                                                             
    (3) Options and agreements to                                                            
    purchase/sell:                                                                           
                                                                                             
                                                                         232,442       0.4083
         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                                                                         
                                                                                           
                                                                                           
     USD 0.001 ordinary           Sale                   286              GBP 184.1000     
                                                                                           
     USD 0.001 ordinary           Sale                   650              GBP 185.0527     
                                                                                           
     USD 0.001 ordinary           Sale                  1,349             GBP 184.1000     
                                                                                           
     USD 0.001 ordinary           Sale                  3,070             GBP 185.0527     
                                                                                           

    (b)        Derivatives transactions (other than options)

       Class of        Product        Nature of dealing       Number of     Price per unit 
       relevant      description    e.g. opening/closing a    reference                    
       security        e.g. CFD      long/short position,     securities                   
                                    increasing/reducing a                                  
                                     long/short position                                   
                                                                                           
                                                                                           
    USD 0.001                                                                              
    ordinary         Total Return      Increasing Short          650         GBP 185.4086  
                         Swap              Position                                        
    USD 0.001                                                                              
    ordinary         Total Return                               3,070        GBP 185.4086  
                         Swap          Increasing Short                                    
                                           Position                                        

    (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/NO     

       

    Date of disclosure:                         6th October 2015                           
                                                                                           
    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.