Tekla Corporation STOCK EXCHANGE ANNOUNCEMENT 12 September 2008 ACQUISITIONS OF OWN SHARES Date: 12.9.2008 Exchange transaction: Buy Share class: TLA1V Amount: 666 Average price /share: 7,05201 EUR Highest price /share: 7,10 EUR Lowest price /share: 7,03 EUR Total price: 4696,64 EUR The shares held by Tekla Corporation on 12 September 2008 TLA1V 130789 TEKLA CORPORATION On behalf of Tekla Corporation Jaakko Salomaa EVLI BANK PLC