Holding(s) in Company

IG Group Holdings plc
21 January 2008



TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer of existing shares to which
   voting rights are attached:

   IG Group Holdings PLC

2. Reason for the notification
(please place an X inside the appropriate bracket/s):

   An acquisition or disposal of voting rights: ( X )

   An acquisition or disposal of financial instruments which may result in the
   acquisition of shares already issued to which voting rights are attached: ( )

   An event changing the breakdown of voting rights: ( )

   Other (please specify) : ( )
   .................

3. Full name of person(s) subject to notification obligation:

   JPMorgan Chase & Co

4. Full name of shareholder(s) (if different from 3) :

   JPMorgan Asset Management (Japan) Limited
   JPMorgan Asset management (UK) Limited

5. Date of transaction (and date on which the threshold is crossed or reached if
   different):

   14 January 2008

6. Date on which issuer notified:


15 January 2008

7. Threshold(s) that is/are crossed or reached:

   5%

8. Notified Details:

A: Voting rights attached to shares

Class/type of shares                  Situation previous to the triggering transaction
if possible use ISIN 
CODE                                            
                                   Number of shares                Number of voting rights

Ordinary                           16,436,314                      16,436,314
GB00B06QFB75


                                  Resulting situation after the triggering transaction
Class/type of shares        Number of          Number of voting          % of voting rights
                            shares             rights
if possible use ISIN
CODE
                                               Direct    Indirect        Direct    Indirect

Ordinary                    15,830,307           -       15,830,307      4.83%     15,830,307

B: Financial Instruments
Resulting situation after the triggering transaction

Type of        Expiration      Exercise/conversion      No. of voting             % of voting
financial      date            period/date              rights that may be        rights
instrument                                              acquired (if the
                                                        instrument
                                                        exercised/
                                                        converted)



Total (A+B)
Number of voting rights      % of voting rights

15,830,307                   4.83%


9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable :

Total disclosable holding for JPMorgan Chase & Co. :15,830,307 (4.83%)

JPMorgan Asset Management (Japan) Limited

JPMorgan Asset Management (UK) Limited: 15,830,307 (4.83%)

Proxy Voting:

10. Name of proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A

13. Additional information:

Please note the JPMorgan group has other holdings which are covered by
exemptions.

14. Contact name:

Guy Abbi, Company Secretary
IG Group holdings plc

15. Contact telephone number:

020 7896 0011






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