AMP LIMITED — Major Shareholding Notification 2010

Sep 28, 2010

Financial Services Authority

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Henderson Group plc

29 September 2010

Attached is a notification which was required to be announced under London Stock Exchange Listing Rules.

TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

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

An acquisition or disposal of voting rights

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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):

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----- Start of picture text ----- 3. Full name of person(s) subject to the AMP Limited, AMP Life Limitednotification obligation: and AMP Capital InvestorsLimited4. Full name of shareholder(s) (if different from 3.): Stichting PensionfondsHoogovens, StichtingPensionfonds ABP,Government EmployeesSuperannuation Board, QLDLocal GovernmentSuperannuation Board andCommonwealth Bank OfficersSuperannuation CorporationPty Limited as trustee for the----- End of picture text -----

252045v1 HGI SSN notification (a) (27 September 2010).DOC

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----- Start of picture text ----- Officers’ Superannuation Fund.5. Date of the transaction (and date on which the 27 September 2010threshold is crossed or reached if different):6. Date on which issuer notified: 29 September 20107. Threshold(s) that is/are crossed or reached: 4% (crossing above 4%)8. Notified details:A: Voting rights attached to sharesClass/t Situation previous to Resulting situation after the triggering transactionype of the Triggeringshares transaction if Number Number of Number Number of voting % of voting rightspossible of Shares Voting of shares rightsusing the RightsISINCODE Direct Direct Indirect Direct IndirectOrdinary 32,562,450 32,562,450 36,354,291 26,497,907 9,856,384 3.21% 1.19%shares(viaCHESSDepositaryInterests)B: Financial InstrumentsResulting situation after the triggering transactionType of financial Expiration Exercise/ Conversion Number of voting % of votinginstrument date Period/ Date rights that may be rightsacquired if theinstrument isexercised/ converted.Total (A+B)Number of voting rights % of voting rights----- End of picture text -----

252045v1 HGI SSN notification (a) (27 September 2010).DOC

36,354,291 4.40%

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

AMP Life Limited is an indirect wholly owned subsidiary of AMP Limited.

AMP Capital Investors Limited is an indirect wholly owned subsidiary of AMP Limited.

Proxy Voting:

10. Name of the proxy holder: 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: Level 24, AMP Sydney Cove Building 33 Alfred Street Sydney New South Wales 2000 Fax: +61 2 9257 1541 14. Contact name: James Crook, Senior Legal Counsel, AMP Capital Investors Limited 15. Contact telephone number: +61 2 9257 1512

252045v1 HGI SSN notification (a) (27 September 2010).DOC