Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 17 February 2010 REPURCHASE OF OWN SHARES Date: 17 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 1957 Average price /share: 11.23540 EUR Highest price /share: 11.27000 EUR Lowest price /share: 11.10000 EUR Total price: 21987,68 EUR The shares held by Ahlstrom Corporation on 17 February 2010 AHL1V 25657 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC