Notification of Major Interest 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 

An event changing the breakdown of voting rights

No

Other (please specify):______________

N/A

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

Investec Asset Management Ltd

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):

29 September 2008

6. Date on which issuer notified:

10 October 2008

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

5%

8: Notified Details

A: Voting rights attached to shares

Class/type of shares

Ordinary Shares

ISIN:ISIN:

GB00B06QFB75

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of shares

17,866,694

Number of voting rights

17,866,694

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

17,916,336

Direct

Indirect

5.01%

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

17,916,336

5.01%

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:

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:

14 Contact name:

Guy Abbi,

Company Secretary

IG Group Holdings plc

15. Contact telephone name:

020 7896 0011