Holding(s) in Company

IG Group Holdings plc
23 February 2007



TR-1: NOTIFICATION 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: (    )

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): First notification under DTR Sourcebook. Notification
using the total voting rights figure of 327,500,959.

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

Legal and General Group Plc (L&G)

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

.................


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

.................



6. Date on which issuer notified:

22/02/07

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

Above 3%

8. Notified details:

.................



A: Voting rights attached to shares


Class/type of shares if possible      Situation previous to the Triggering transaction
using the ISIN CODE
                                      Number of shares               Number of voting Rights

                                      9,946,779                      9,946,779

Resulting situation after the triggering transaction


Class/type of shares if possible Number of shares        Number of voting rights          % of voting rights
using the ISIN CODE
                                 Direct                  Direct       Indirect            Direct      Indirect
Ord GBP 0.0005
                                 9,946,779               9,946,779                        3.03%

B: Financial Instruments

Resulting situation after the triggering transaction


Type of         Expiration Date      Exercise/Conversion       Number of voting rights     % of voting rights
financial                            Period/ Date              that may be acquired if the
instrument                                                     instrument is exercised/
                                                               converted.




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

9,946,779                      3.03


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

Legal & General Group Plc (Direct and Indirect) (Group)

Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and
Indirect)

Legal & General Investment Management Limited (Indirect) (LGIM)

Legal & General Group Plc (Direct) (L&G) (9,946,779-3.03% = LGAS, LGPL & PMC)

Legal & General Investment Management (Holdings) Limited (Direct) (LGIMHD)

Legal & General Insurance Holdings Limited (Direct) (LGIH)

Legal & General Assurance (Pensions Management) Limited  (PMC)

Legal & General Assurance Society Limited  (LGAS & LGPL)

Legal & General Pensions Limited (Direct)  (LGPL)



Proxy Voting:



10. Name of the proxy holder:

.................



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

.................



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

.................



13. Additional information:

.................



14. Contact name:



Guy Abbi, Company Secretary, IG Group Holdings Plc



15. Contact telephone number:



020 7633 5463


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