Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 12 November 2010 REPURCHASE OF OWN SHARES Date: 12 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 3597 Average price /share: 14.4751 EUR Highest price /share: 14.5100 EUR Lowest price /share: 14.4400 EUR Total price: 52066.93 EUR The shares held by Ahlstrom Corporation on 12 November 2010 AHL1V 96597 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC