Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 26 February 2010 REPURCHASE OF OWN SHARES Date: 26 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 650 Average price /share: 11.24620 EUR Highest price /share: 11.40000 EUR Lowest price /share: 11.20000 EUR Total price: 7310.03 EUR The shares held by Ahlstrom Corporation on 26 February 2010 AHL1V 40814 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC