Blocklisting Interim Review

Name of applicant:

Antisoma plc

Name of scheme:

Antisoma Company Share Option Plan

Period of return:

From:

12 Oct 10

To:

14 Apr 11

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

9,933,671

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

0

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

9,933,671

Name of applicant:

Antisoma plc

Name of scheme:

Antisoma Executive Incentive Plan, the Antisoma Deferred Share Bonus Plan and the 2008 Antisoma plc Company Share Option Plan

Period of return:

From:

12 Oct 10

To:

14 Apr 11

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

5,526,955

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

6,038,138

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

511,183

Name of contact:

Eric Dodd

Telephone number of contact:

+44 (0)20 3249 2100