Notifications of Major Interests in Shares

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 notification (yes/no)

An acquisition or disposal of voting rights

Yes

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

No

An event changing the breakdown of voting rights

No

Other (please specify):______________

N/A

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

Janus Capital Management, LLC ("Janus")

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):

23 October 2008

6. Date on which issuer notified:

24 October 2008

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

7%

8: Notified Details

A: Voting rights attached to shares

Class/type of shares

If possible use ISIN code= Ordinary Shares

ISIN:

GB00B06QFB75

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of shares 

28,019,235

Number of voting rights 

28,019,235

Number of shares 

24,850,617

Number of voting rights

Percentage of voting rights

24,850,617

Direct

Indirect

6.95%

Direct

Indirect

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date 

No. of voting rights that may be acquired (if the instrument exercised/converted)

Percentage of voting rights

Total (A+B)

Number of voting rights

Percentage of voting rights

24,850,617

6.95%

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:

Janus Capital Management LLC

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

3,168,618

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

23 October 2008

13. Additional information:

14 Contact name:

Guy Abbi, Company Secretary,

IG Group Holdings plc

15. Contact telephone name:

020 7896 0011