Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 11 November 2010 REPURCHASE OF OWN SHARES Date: 11 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 6000 Average price /share: 14.6993 EUR Highest price /share: 14.8000 EUR Lowest price /share: 14.5500 EUR Total price: 88195.80 EUR The shares held by Ahlstrom Corporation on 11 November 2010 AHL1V 93000 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC