Henderson Group - Blocklisting Application

Henderson Group plc

Block Listing Application

21 January 2011

Application has been made to The UK Listing Authority and The London Stock Exchange for block listings totalling 10,000,000 Ordinary shares of 12.5p each to trade on The London Stock Exchange and to be admitted to The Official List. The shares shall rank equally with the existing issued shares of the Company.

The block listings consist of 7,000,000 shares to be issued under the Henderson Group plc Long Term Incentive Plan and 3,000,000 shares under the Henderson Group plc Restricted Share Plan.

Matthew Purkis

Henderson Group plc

Deputy Company Secretary +44 (0)20 7818 2959

matthew.purkis@henderson.com

Henderson Group plc

47 Esplanade,

Jersey JE1 0BD

Registered in JerseyNo. 101484

ABN 67 133 992 766