Tekla Corporation STOCK EXCHANGE ANNOUNCEMENT 23 September 2008 ACQUISITIONS OF OWN SHARES Date: 23.9.2008 Exchange transaction: Buy Share class: TLA1V Amount: 4500 Average price /share: 6,51417 EUR Highest price /share: 6,79 EUR Lowest price /share: 6,40 EUR Total price: 29313,77 EUR The shares held by Tekla Corporation on 23 September 2008 TLA1V 144866 TEKLA CORPORATION On behalf of Tekla Corporation Lauri Ahokanto EVLI BANK PLC