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) Full name of discloser:                Jackson Square Partners, LLC
                                                                           
    (b) Owner or controller of interests and                               
    short positions disclosed, if different                                
    from 1(a):                                                             
          The naming of nominee or vehicle                                 
    companies is                                                           
    insufficient.  For a trust, the trustee                                
    (s), settlor and beneficiaries must be                                 
    named.                                                                 
                                                                           
    (c) Name of offeror/offeree in relation to Equinix, Inc.               
    whose 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: January 15, 2016            
     For an opening position disclosure, state                             
    the latest practicable date prior to the                               
    disclosure                                                             
                                                                           
    (f) In addition to the company in 1(c)     NO                          
    above, is the discloser making disclosures                             
    in respect of any other party to the                                   
    offer?                                                                 
          If it is a cash offer or possible                                
    cash offer, state "N/A"                                                

    2.POSITIONS OF THE PERSON MAKING THE DISCLOSURE

    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.

    (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:                  COMMON STOCK                
                                                                             
                                       Interests           Short positions   
                                                                             
                                      Number      %         Number        %  
                                                                             
    (1) Relevant securities                       4.84                       
    owned and/or controlled:        2,899,779                                
                                                                             
    (2) Cash-settled                                                         
    derivatives:                                                             
                                                                             
    (3) Stock-settled                                                        
    derivatives (including                                                   
    options) and agreements to                                               
    purchase/sell:                                                           
                                                                             
                                    2,899,779     4.84                       
         TOTAL:                                                              

    All interests and all short positions should be disclosed.

    Details of any open stock-settled derivative positions (including traded
    options), or agreements to purchase or sell relevant securities, should be
    given on a Supplemental Form 8 (Open Positions).

                                                                                  2

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

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

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

    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.

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

    (a)         Purchases and sales

    Class of relevant   Purchase/sale       Number of      Price per unit  
        security                           securities                      
                                                                           
    COMMON STOCK      Sale              3,996             $303.1900        

    (b)         Cash-settled derivative transactions

      Class of      Product      Nature of dealing    Number of    Price per  
      relevant    description  e.g. opening/closing   reference       unit    
      security      e.g. CFD       a long/short       securities              
                                     position,                                
                               increasing/reducing a                          
                                long/short position                           
                                                                              

    (c)        Stock-settled derivative transactions (including options) (i)     
    Writing, selling, purchasing or varying

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

    (ii)         Exercise

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

                                                                                  3

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

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

    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:                    
    Irrevocable commitments and letters of intent should not be included.  
    If there are no such agreements, arrangements or understandings, state 
    "none"                                                                 
                                                                           
                                                                           
    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"                                                                 
                                                                           
                                                                           
    NONE                                                                   

    (c)         Attachments

    Is a Supplemental Form 8 (Open Positions) attached?            NO      

       

    Date of disclosure:                 January 18, 2016                   
                                                                           
    Contact name:                       Thomas Reinholm                    
                                                                           
    Telephone number:                   +1 415 635 0228                    

    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 disclosure requirements on
    +44 (0)20 7638 0129.

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