Transaction in Own Shares

ICAP plc (ICAP / the "Company")

Transaction in own shares

ICAP plc announces that on 12 August 2011 it purchased 30,000 of its 10p ordinary shares at a price of 417.3049 pence per ordinary share.

The shares purchased will be held as Treasury Shares and are part of its ongoing capital management.

Following the above purchase, the Company holds 9,035,154 ordinary shares as Treasury Shares. The total number of ordinary shares in issue (excluding shares held in treasury) is 655,306,801.

This share buyback is in accordance with the authority granted by shareholders at its annual general meeting in July 2011.

Contact:

Brigitte Trafford Director of Corporate Affairs, ICAP plc Tel: + 44 20 7050 7103

Alex Dee Head of Investor Relations, ICAP plc Tel: + 44 20 7050 7123

ICAP plc

15 August 2011