VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 7.5.2015 SHARE REPURCHASE 7.5.2015 In the Helsinki Stock Exchange Trade date 7.5.2015 Bourse trade BUY Share VAIAS Amount 2 500 shares Total cost 59 325,00 EUR Average price/ share 23,7300 EUR Highest price/ share 23,87 EUR Lowest price/ share 23,63 EUR Vaisala Corporation now holds a total of 42 050 shares including the shares repurchased on 7.5.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1919967]