Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 12 February 2010 REPURCHASE OF OWN SHARES Date: 12 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 6831 Average price /share: 10,88500 EUR Highest price /share: 11,00000 EUR Lowest price /share: 10,70000 EUR Total price: 74355,44 EUR The shares held by Ahlstrom Corporation on 12 February 2010 AHL1V 13500 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC