Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 23 November 2010 REPURCHASE OF OWN SHARES Date: 23 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 4863 Average price /share: 14.7538 EUR Highest price /share: 14.8500 EUR Lowest price /share: 14.6200 EUR Total price: 71747.73 EUR The shares held by Ahlstrom Corporation on 23 November 2010 AHL1V 112609 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC