Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 09 November 2010 REPURCHASE OF OWN SHARES Date: 09 November 2010 Exchange transaction: Buy Share class: AHL1V Amount: 3400 Average price /share: 15.0110 EUR Highest price /share: 15.0500 EUR Lowest price /share: 14.8500 EUR Total price: 51037.40 EUR The shares held by Ahlstrom Corporation on 09 November 2010 AHL1V 87000 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Teemu Koivisto EVLI BANK PLC