AMP LIMITED — Major Shareholding Notification 2011

Apr 18, 2011

Henderson Group plc

18 April 2011

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 of existing shares to which voting rights are attached:

Henderson Group plc

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

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An acquisition or disposal of voting rights

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X
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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 X Other (please specify):

3. Full name of person(s) subject to the AMP Limited, AMP Life Limited, notification obligation: AMP Capital Investors Limited and Ipac Asset Management Limited

4. Full name of shareholder(s) (if different from 3.): Stichting Pensionfonds Hoogovens, Stichting Pensionfonds ABP, Government Employees Superannuation Board, QLD Local Government Superannuation Board and Commonwealth Bank Officers Superannuation Corporation Pty Limited as trustee for the Officers’ Superannuation Fund.

269500v1 HGI SSN notification (7(2) December 2010).DOC

5. Date of the transaction (and date on which the 15 April 2011 threshold is crossed or reached if different):

6. Date on which issuer notified:

18 April 2011

7. Threshold(s) that is/are crossed or reached: 3% (crossing above 3%)

8. Notified details:

A: Voting rights attached to shares

Class/t Situation previous to Resulting situation after the triggering transaction ype of the Triggering shares transaction if Number Number of Number Number of voting % of voting rights possible of Shares Voting of shares rights using the Rights ISIN CODE Direct Direct Indirect Direct Indirect Ordinary 31,977,303 31,977,303 33,975,796 29,258,488 4,717,308 2.69% 0.43% shares (via CHESS Deposita ry Interests )

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial	Expiration	Exercise/ Conversion	Exercise/ Conversion	Number of voting	% of voting
instrument	date	Period/ Date		rights that may be	rights
				acquired if the
				instrument is
				exercised/ converted.
Total (A+B)
Number of voting rights			% of voting rights
33,975,796			3.13%

269500v1 HGI SSN notification (7(2) December 2010).DOC

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.

Ipac Asset Management 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

269500v1 HGI SSN notification (7(2) December 2010).DOC