Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 30 November 2010 REPURCHASE OF OWN SHARES Date: 30 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 5000 Average price /share: 14.4280 EUR Highest price /share: 14.4300 EUR Lowest price /share: 14.4200 EUR Total price: 72140.00 EUR The shares held by Ahlstrom Corporation on 30 November 2010 AHL1V 129458 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC