Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 25 November 2010 REPURCHASE OF OWN SHARES Date: 25 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 4391 Average price /share: 14.3377 EUR Highest price /share: 14.5200 EUR Lowest price /share: 14.2500 EUR Total price: 62956.84 EUR The shares held by Ahlstrom Corporation on 25 November 2010 AHL1V 121000 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC