Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

Betfair Group Plc

2. Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

ü

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

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

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

FMR LLC

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

See attached schedule

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

21 April 2011

6. Date on which issuer notified:

26 April 2011

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

5%

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

 GB00B44JTH01

 5,209,105

 5,209,105

 5,459,105

 5,459,105

5.10

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/ConversionPeriod

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate

Exercise/Conversionperiod

Number of votingrights instrumentrefers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

 5,459,105

 5.10%

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

See attached schedule

Proxy Voting:

10. Name of the proxy holder:

FMR LLC

11. Number of voting rights proxy holder will acquire:

250,000

12. Date on which proxy holder will acquire voting rights:

21 April 2011

13. Additional information:

14. Contact name:

Philip Alexander / 01737 834624

15. Contact telephone number:

[email protected]

FMR

Issuer name:

BETFAIR GROUP LTD

Current ownership percentage:

5.10%

Total shares held:

5,459,105

Issued share capital:

106,935,448

SHARES HELD

NOMINEE

MANAGEMENT COMPANY

FMR LLC is the parent holding company of Fidelity Management & Research Company (FMRCO), investment manager for US mutual funds, FIL Management Trust Company (FMTC), Pyramis Global Advisors Trust Company (PGATC), a US state chartered bank which acts as a trustee or investment manager of various pension and trust accounts Pyramis Global Advisors LLC (PGALLC) and Pyramis Trust Company (PTC)

2,090,313

BROWN BROTHERS HARRIMAN AND CO

FMR

173,800

BROWN BROTHERS HARRIMAN AND CO

FMRCO

124,100

JP MORGAN CHASE BANK

FMRCO

79,305

JPMORGAN CHASE BANK

FMR

1,383,675

NORTHERN TRUST CO

FMR

1,607,912

CITIBANK NA (C)

FMR