Rule 8.3 - London Stock Exchange Group plc

OZ Management, LLC
                  

                                    FORM 8.3

    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE

                         (Rule 8.3 of the Takeover Code)

1. KEY INFORMATION

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Name of person dealing                    OZ Management LLC
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Company dealt in                          London Stock Exchange Group Plc
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Class of relevant security to which the   Ordinary 6 79/86p
 dealings being disclosed relate
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Date of dealing                           22nd January 2007
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2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a) Interests and short positions (following dealing) in the class of relevant
security dealt in

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                                                       Long                          Short
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                                          Number (%)                    Number (%)
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(1) Relevant securities
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(2) Derivatives (other than options)      2,310,000 1.08
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(3) Options and agreements to
 purchase/sell                                                          1,700,000 0.80
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Total                                     2,310,000 1.08                1,700,000 0.80
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(b) Interests and short positions in relevant securities of the company, other
than the class dealt in

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       Class of relevant security:                     Long                          Short
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                                          Number (%)                    Number (%)
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(1) Relevant securities
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(2) Derivatives (other than options)
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(3) Options and agreements to
 purchase/sell
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Total
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(c) Rights to subscribe

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Class of relevant security:               Details
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3. DEALINGS

(a) Purchases and sales

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Purchase/sale                      Number of securities              Price per unit (pence)
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(b) Derivatives transactions (other than options)

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Product name,       Long/short (Note 6)    Number of securities            Price per unit
e.g. CFD
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Swap                Long                   610,000                         13.0182 GBP
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(c) Options transactions in respect of existing securities

(i) Writing, selling, purchasing or varying

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Product name,      Writing,        Number of          Exercise  Type, e.g.   Expiry    Option money
e.g. call option    selling,        securities to     price      American,   date      paid/received
                    purchasing,     which the option             European               per unit
                    varying etc.    relates                      etc.
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(ii) Exercising

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Product name, e.g. call option     Number of securities              Exercise price per unit
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(d) Other dealings (including new securities)

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Nature of transaction)             Details                           Price per unit (if applicable)
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4. OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives

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Full details of any agreement, arrangement or understanding between the person disclosing and any other
 person relating to the voting rights of any relevant securities under any option referred to on this
 form or relating to the voting rights or future acquisition or disposal of any relevant securities to
 which any derivative referred to on this form is referenced. If none, this should be stated.
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None.
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Is a Supplemental Form 8 attached? Yes

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Date of disclosure                                          24th January 2007
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Contact name                                                Robin Cotterill
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Telephone number                                            0207 758 4466
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If a connected EFM, name of offeree/offeror with which
 connected                                                  N/A
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If a connected EFM, state nature of connection              N/A
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Notes

The Notes on Form 8.3 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk

SUPPLEMENTAL FORM 8

                            DETAILS OF OPEN POSITIONS

   (This form should be attached to Form 8.1, Form 8.1(b)(ii) or Form 8.3, as
                                  appropriate)

OPEN POSITIONS (Note 1)

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Product name,      Written or    Number of securitiesExercise price  Type, e.g.   Expiry date
e.g. call option    purchased     to which the option (Note 2)        American,
                                  or derivative                       European
                                  relates                             etc.
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Call Option        Written       1,700,000           13.50 GBP       American     16 MAR 06
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Notes

1. Where there are open option positions or open derivative positions (except
for CFDs), full details should be given. Full details of any existing agreements
to purchase or to sell should also be given on this form.

2. For all prices and other monetary amounts, the currency must be stated.

For details of the Code's dealing disclosure requirements, see Rule 8 and its
Notes which can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk