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 FEBRUARY 2011

To:

31 JULY 2011

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

12,966,373

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):

 5,000,000 (Henderson Group plc Long Term Incentive Plan)

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

Henderson Group plc Long Term Incentive Plan

6,127,285

Henderson Group plc Restricted Share Plan

1,189,426

Henderson Group plc Deferred Equity Plan

NIL

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

10,649,662

Name of contact:

MR MATTHEW PURKIS

Telephone number of contact:

020 7818 2959