Tieto Corporation Stock Exchange Announcement 20 May 2009 6.30 pm EET Date: 20 May 2009 Exchange transaction: Buy Share class: TIE1V Amount: 18000 Average price /share: EUR 10,49785 Highest price /share: EUR 10,55 Lowest price /share: EUR 10,39 Total price: EUR 188961,30 The number of shares held by the company including the shares acquired on 20 May 2009 TIE1V 521390 Tieto Corporation On behalf of Tieto Corporation Teemu Koivisto EVLI BANK PLC