Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 15 November 2010 REPURCHASE OF OWN SHARES Date: 15 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 5403 Average price /share: 14.5519 EUR Highest price /share: 14.5800 EUR Lowest price /share: 14.5000 EUR Total price: 78623.92 EUR The shares held by Ahlstrom Corporation on 15 November 2010 AHL1V 102000 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC