Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 25 February 2010 REPURCHASE OF OWN SHARES Date: 25 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 2274 Average price /share: 11.18320 EUR Highest price /share: 11.20000 EUR Lowest price /share: 11.17000 EUR Total price: 25430,60 EUR The shares held by Ahlstrom Corporation on 25 February 2010 AHL1V 40164 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC