Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 05 March 2010 REPURCHASE OF OWN SHARES Date: 05 March 2010 Exchange transaction: Buy Share class: AHL1V Amount: 5000 Average price /share: 12.38500 EUR Highest price /share: 12.40000 EUR Lowest price /share: 12.37000 EUR Total price: 61925.00 EUR The shares held by Ahlstrom Corporation on 05 March 2010 AHL1V 55000 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC