Henderson Group - Director/PDMR Shareholding

Director/PDMR shareholding: Disclosure and Transparency Rules 3.1.4R(1)(a)

30 June 2010

On 29 June 2010 the following ordinary shares in Henderson Group plc were purchased on behalf of the following Non-Executive Directors of Henderson Group plc at a price of 122.97 pence per share. These shares were acquired on-market on behalf of the Non-Executive Directors in lieu of a portion of annual Non-Executive Director's fees for 2010.

DIRECTOR HENDERSON TOTAL

GROUP PLC BENEFICIAL

SHARES PURCHASED INTEREST

FOLLOWING THIS

NOTIFICATION

Rupert Pennant-Rea 8,262 51,333

Gerald Aherne 4,980 9,571

Duncan Ferguson 2,551 13,688

Tim How 2,307 5,898

Robert Jeens 4,981 5,845

Henderson Group plc

47 Esplanade,

Jersey JE1 0BD

Registered in Jersey No. 101484

ARBN 133 992 766