Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 24 February 2010 REPURCHASE OF OWN SHARES Date: 24 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 6733 Average price /share: 11.22890 EUR Highest price /share: 11.40000 EUR Lowest price /share: 11.20000 EUR Total price: 75604,18 EUR The shares held by Ahlstrom Corporation on 24 February 2010 AHL1V 37890 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC