Holding(s) in Company

London Stock Exchange Group PLC
18 October 2006

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company



London Stock Exchange Group plc


2. Name of shareholder having a major interest


Barclays PLC through the legal entities below:                                                    Holding



Barclays Global Investors Japan Trust & Banking                                                   188,118
Barclays Capital Securities Ltd                                                                 1,796,302
Barclays Global Investors Japan Ltd                                                                15,647
Barclays Capital Inc                                                                               44,309
Barclays Bank PLC                                                                               3,718,895
Barclays Private Bank and Trust Ltd                                                                 1,806
Barclays Global Investors Ltd                                                                   2,199,865
Barclays Life Assurance Co Ltd                                                                    249,813
Gerrard Ltd                                                                                           375
Barclays Global Investors Canada Ltd                                                               11,631
Barclays Global Fund Advisors                                                                     817,450
Barclays Global Investors, N.A.                                                                 1,115,252
Barclays Global Investors Australia Ltd                                                            14,120



3. Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or in respect of a non-beneficial interest
or in the case of an individual holder if it is a holding of that person's
spouse or children under the age of 18



Not disclosed



4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them


Registered Holder                                                                                 Holding

Bank of New York                                                                                   11,339
Barclays Capital Nominees Limited                                                                  44,309
Barclays Capital Nominees Limited                                                               1,796,302
Barclays Capital Nominees Limited                                                               3,718,895
Boiss Nominees Ltd                                                                                202,820
Barclays Global Investors Canada                                                                   11,631
Chase Nominees Ltd                                                                                109,697
Chase Nominees Ltd                                                                                 73,617
Clydesdale Nominees HGB0225                                                                         1,806
Investors Bank and Trust Co.                                                                      817,450
Investors Bank and Trust Co.                                                                    1,008,410
JP Morgan (BGI Custody)                                                                            57,538
JP Morgan (BGI Custody)                                                                           118,658
JP Morgan (BGI Custody)                                                                         1,687,354
JP Morgan (BGI Custody)                                                                           199,994
JP Morgan Chase Bank                                                                               14,120
JP Morgan Chase Bank                                                                                5,691
JP Morgan Chase Bank                                                                              188,118
JP Morgan Chase Bank                                                                               11,228
Mellon Trust - US Custodian /                                                                       6,386
Mitsui Asset                                                                                        2,861
R C Greig Nominees Limited GP1                                                                        375
State Street Boston and Trust Co                                                                    3,408
State Street Boston                                                                                80,018
Trust & Custody Services Bank                                                                       1,558



5. Number of shares / amount of stock acquired



Not disclosed


6. Percentage of issued class



Not disclosed


7. Number of shares / amount of stock disposed



Not disclosed


8. Percentage of issued class



Not disclosed


9. Class of security



Ordinary Shares



10. Date of transaction



Not disclosed



11. Date company informed



18 October 2006


12. Total holding following this notification



10,173,583


13. Total percentage holding of issued class following this notification



4.76%


14. Any additional information



N/A


15. Name of contact and telephone number for queries



Lisa Condron, 020 7797 3517


16. Name and signature of authorised company official responsible for making
this notification



Lisa Condron


Date of notification



18 October 2006


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