Henderson Group - Blocklisting Interim Review

Name of applicant:

HENDERSON GROUP PLC

Name of scheme:

HENDERSON GROUP PLC LONG TERM INCENTIVE PLAN

HENDERSON GROUP PLC RESTRICTED SHARE PLAN

HENDERSON GROUP PLC DEFERRED EQUITY PLAN

Period of return:

From:

1 AUGUST 2011

To:

31 JANUARY 2012

Balance of unallotted securities under scheme(s) from previous return:

10,649,662

Plus:  The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):

4,000,000 (Henderson Group plc Long Term Incentive Plan)

1,000,000 (Henderson Group plc Restricted Share Plan)

Less:  Number of securities issued/allotted under scheme(s) during period (see LR3.5.7G):

Henderson Group plc Long Term Incentive Plan

5,180,000

Henderson Group plc Restricted Share Plan

623,000

Henderson Group plc Deferred Equity Plan

NIL

Equals:  Balance under scheme(s) not yet issued/allotted at end of period:

9,846,662

Name of contact:

MR MATTHEW PURKIS

Telephone number of contact:

020 7818 2959