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 SEPTEMBER 2010

To:

31 JANUARY 2011

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

12,000,000 (originally block listed on 1 September 2010)

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):

10,000,000

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

Henderson Group plc Long Term Incentive Plan

6,196,380

Henderson Group plc Restricted Share Plan

2,800,153

Henderson Group plc Deferred Equity Plan

37,094

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

12,966,373

Name of contact:

MR MATTHEW PURKIS

Telephone number of contact:

020 7818 2959