Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 29 November 2010 REPURCHASE OF OWN SHARES Date: 29 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 3458 Average price /share: 14.5283 EUR Highest price /share: 14.6000 EUR Lowest price /share: 14.4400 EUR Total price: 50238.86 EUR The shares held by Ahlstrom Corporation on 29 November 2010 AHL1V 124458 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC