Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 15 February 2010 REPURCHASE OF OWN SHARES Date: 15 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 6200 Average price /share: 11.09370 EUR Highest price /share: 11.15000 EUR Lowest price /share: 10.80000 EUR Total price: 68780,94 EUR The shares held by Ahlstrom Corporation on 15 February 2010 AHL1V 19700 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC