Holding(s) in Company

IG Group Holdings plc
29 November 2007


IG Group Holdings Plc - Notification of substantial shareholding
29 November 2007





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:

ReachCapital Management, LLC



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

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



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

November 21, 2007



6. Date on which issuer notified:

November 26, 2007



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

Over 1% change from previous filing.






8. Notified Details:



A: Voting rights attached to shares


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


Ordinary                          11,959,480                         11,959,480




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


  Ordinary                    11,409,480                3.49%                                 3.49%



B: Financial Instruments

Resulting situation after the triggering transaction


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





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


11,409,480                     3.49%



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

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



Proxy Voting:



10. Name of proxy holder:

ReachCapital Management, LLC



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:

  Crossed below previous reporting limit of 4.52%, now 3.49% - 1.03% below 4.52%



14. Contact name:

Guy Abbi, Company Secretary

IG Group holdings plc



15. Contact telephone number:

020 7896 0011






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