Vaisala Corporation ANNOUNCEMENT 5.6.2012 SHARE REPURCHASE 5.6.2012 In the Helsinki Stock Exchange Trade date 5.6.2012 Bourse trade Buy Share VAIAS Amount 300 Shares Total cost 4.410,00 EUR Average price/ share 14,7000 EUR Highest price/ share 14,70 EUR Lowest price/ share 14,70 EUR Vaisala Corporation now holds a total of 154.074 shares including the shares repurchased on 5.6.2012. On behalf of Vaisala Corporation Nordea Bank Finland Plc Petri Simberg Julius Summanen