VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 8.5.2015 SHARE REPURCHASE 8.5.2015 In the Helsinki Stock Exchange Trade date 8.5.2015 Bourse trade BUY Share VAIAS Amount 2 274 shares Total cost 54 537,34 EUR Average price/ share 23,9830 EUR Highest price/ share 24,00 EUR Lowest price/ share 23,90 EUR Vaisala Corporation now holds a total of 44 324 shares including the shares repurchased on 8.5.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1920281]