Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 08 December 2010 REPURCHASE OF OWN SHARES Date: 08 December 2010 Exchange transaction: Buy Share class: AHL1V Amount: 5000 Average price /share: 14.6940 EUR Highest price /share: 14.7200 EUR Lowest price /share: 14.6300 EUR Total price: 73470.00 EUR The shares held by Ahlstrom Corporation on 08 December 2010 AHL1V 145958 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC