Treasury Stock

HALMA p.l.c.TREASURY SHARE TRANSACTION

Halma p.l.c. announces that it purchased a total of 300,000 of its ordinary shares on 24 and 25 March 2011 through J.P. Morgan Cazenove at an average price of 344.5666p per share. The purchased shares will not be subject to cancellation and will all be held as treasury shares in order to satisfy awards under the Halma p.l.c. Performance Share Plan 2005.

Following the above transaction, Halma p.l.c. holds 1,847,368 ordinary shares as treasury shares. The total number of ordinary shares in issue (excluding shares held as treasury shares) is 376,388,317.

Contact for further information:

Carol ChesneyCompany Secretary, Halma p.l.c.Tel: +44 (0)1494 721111

A copy of this announcement, together with other information about Halma, may be viewed on its website: www.halma.com