Tekla Corporation STOCK EXCHANGE ANNOUNCEMENT 22 September 2008 ACQUISITIONS OF OWN SHARES Date: 22.9.2008 Exchange transaction: Buy Share class: TLA1V Amount: 5400 Average price /share: 6,73209 EUR Highest price /share: 6,80 EUR Lowest price /share: 6,56 EUR Total price: 36353,29 EUR The shares held by Tekla Corporation on 22 September 2008 TLA1V 140366 TEKLA CORPORATION On behalf of Tekla Corporation Lauri Ahokanto EVLI BANK PLC