Holding(s) in Company

Experian Group Limited
21 April 2008



TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES


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

Experian Group Limited


2. Reason for the notification (please state 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) : ( )


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

Viking Global Investors LP (Investment Manager)

Viking Global Performance LLC (Investment Advisor)

Viking Global Equities LP

Viking Global Equities II LP

VGE III Portfolio Ltd


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

Viking Global Equities LP

Viking Global Equities II LP

VGE III Portfolio Ltd

(collectively 'the Funds')


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

16/04/08


6. Date on which issuer notified:

18/04/08


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

5%


8. Notified details: The Funds






A: Voting rights attached to shares

Class/type of shares if possible using    Situation previous to the triggering
the ISIN CODE                                       transaction (vi)
                                        Number of      Number of voting rights
                                        shares         (viii)

ORD US 0.10                               50,080,000                50,080,000
(GB00B19NLV48)



Resulting situation after the triggering transaction (vii)

Class/type of shares if     Number of     Number of voting       % of voting
possible using the ISIN     shares        rights (ix)            rights
CODE

                                          Direct (x)    Indirect Direct Indirect
                                                        (xi)

ORD US 0.10                  51,227,000    51,227,000             5.0%
(GB00B19NLV48)


8. Notified details: Viking Global investors LP/Viking Global Performance LLC


A: Voting rights attached to shares

Class/type of shares if possible using    Situation previous to the triggering
the ISIN CODE                                       transaction (vi)
                                        Number of      Number of voting rights
                                        shares         (viii)

ORD US 0.10                               50,080,000                50,080,000
(GB00B19NLV48)



Resulting situation after the triggering transaction (vii)

Class/type of shares if       Number of     Number of voting     % of voting
possible using the ISIN CODE  shares        rights (ix)          rights

                                            Direct Indirect (xi) Direct Indirect
                                            (x)

ORD US 0.10                    51,227,000           51,227,000             5.0%
(GB00B19NLV48)


B: Financial Instruments

Resulting situation after the triggering transaction (xii)

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





Total (A+B)

Number of voting rights                      % of voting rights

                                51,227,000                                 5.0%


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

N/A


Proxy Voting:


10. Name of the proxy holder:

Viking Global Investors LP

Viking Global Performance LLC


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:

Ronan Hanna


15. Contact telephone number:

+ 353 1 846 9128




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