Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 04 March 2010 REPURCHASE OF OWN SHARES Date: 04 March 2010 Exchange transaction: Buy Share class: AHL1V Amount: 986 Average price /share: 12.28000 EUR Highest price /share: 12.28000 EUR Lowest price /share: 12.28000 EUR Total price: 12108.08 EUR The shares held by Ahlstrom Corporation on 04 March 2010 AHL1V 50000 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC