Tekla Corporation STOCK EXCHANGE ANNOUNCEMENT 17 September 2008 ACQUISITIONS OF OWN SHARES Date: 17.9.2008 Exchange transaction: Buy Share class: TLA1V Amount: 4177 Average price /share: 6,92528 EUR Highest price /share: 7,00 EUR Lowest price /share: 6,82 EUR Total price: 28926,89 EUR The shares held by Tekla Corporation on 17 September 2008 TLA1V 134966 TEKLA CORPORATION On behalf of Tekla Corporation Jaakko Salomaa EVLI BANK PLC