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  Magnetar Capital Partners LP 
are being disclosed: 
 
(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     CME Group Inc. 
relevant securities this form relates: 
     Use a separate form for each offeror/offeree 
 
(d) If an exempt fund manager connected with an      N/A 
offeror/offeree, state this and specify identity of 
offeror/offeree: 
 
(e) Date position held/dealing undertaken:           May 3, 2018 
 
(f)  Has the discloser previously disclosed, or are  Yes - NEX Group plc 
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:                    USD 0.01 Class A common stock 
                                                    ISIN: US12572Q1058 
 
                                            Interests               Short positions 
 
                                         Number          %           Number         % 
 
(1) Relevant securities owned and/ 
or controlled: 
 
(2) Derivatives (other than                                         163,851        .05% 
options): 
 
(3) Options and agreements to 
purchase/sell: 
 
                                                                    163,851        .05% 
     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        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 
 
Ordinary shares       Swap      Decreasing a short                     6       155.0817 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    58       156.9193 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    59       157.4993 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    66       157.3389 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    68       157.0012 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    71        154.877 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    71        156.102 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    75        155.074 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    77       157.3106 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    79       157.8332 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    80       155.4471 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    80        157.015 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    83       156.5046 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    83       157.7716 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    83       157.1171 
                                position 
 
Ordinary shares       Swap      Decreasing a short                    86       157.7514 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   149       155.2302 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   166       156.8917 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   222       158.1661 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   228       156.1236 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   240        157.885 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   248       157.0683 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   253        157.839 
                                position 
 
Ordinary shares       Swap      Decreasing a short                   256       156.9169 
                                position 
 
Ordinary shares       Swap      Increasing a long                      1         155.26 
                                position 
 
Ordinary shares       Swap      Increasing a long                      4         156.39 
                                position 
 
Ordinary shares       Swap      Increasing a long                    224          155.5 
                                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" 
 
 
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:                         May 4, 2018 
 
Contact name:                               Audrey Newsom 
 
Telephone number:                           847-905-4693 
 
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 . 
 
 
 
END 
 

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