Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 11 February 2010 REPURCHASE OF OWN SHARES Date: 11 February 2010 Exchange transaction: Buy Share class: AHL1V Amount: 669 Average price /share: 11,00000 EUR Highest price /share: 11,00000 EUR Lowest price /share: 11,00000 EUR Total price: 7359,00 EUR The shares held by Ahlstrom Corporation on 11 February 2010 AHL1V 6669 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC