Rule 2.10 Announcement

London Stock Exchange Group PLC
01 December 2006

LONDON STOCK EXCHANGE GROUP PLC

1 December 2006

RULE 2.10 ANNOUNCEMENT

London Stock Exchange Group plc announces, in accordance with Rule 2.10 of the
City Code on Takeovers and Mergers, that as at 1 December 2006 its issued share
capital consists of 213,216,890 ordinary shares of 6 79/86 pence each, 7,845,459
B shares of 200 pence each and 119,367,250 deferred shares of 200 pence each.

The International Securities Identification Number of the ordinary shares is
GB00B0SWJX34

The International Securities Identification Number of the B shares is
GB00B0SXD233



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