Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 16 February 2010 REPURCHASE OF OWN SHARES Date: 16 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 4000 Average price /share: 11.12950 EUR Highest price /share: 11.20000 EUR Lowest price /share: 11.11000 EUR Total price: 44518,00 EUR The shares held by Ahlstrom Corporation on 16 February 2010 AHL1V 23700 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC