Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 12 March 2010 REPURCHASE OF OWN SHARES Date: 12 March 2010 Exchange transaction: Buy Share class: AHL1V Amount: 5000 Average price /share: 12.41800 EUR Highest price /share: 12.45000 EUR Lowest price /share: 12.33000 EUR Total price: 62090.00 EUR The shares held by Ahlstrom Corporation on 12 March 2010 AHL1V 70000 AHLSTROM CORPORATION On behalf of Ahlstrom Corporation Pasi Väisänen EVLI BANK PLC