VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 4.8.2015 SHARE REPURCHASE 4.8.2015 In the Helsinki Stock Exchange Trade date 4.8.2015 Bourse trade BUY Share VAIAS Amount 2 000 shares Total cost 48 040,00 EUR Average price/ share 24,0200 EUR Highest price/ share 24,08 EUR Lowest price/ share 24,00 EUR Vaisala Corporation now holds a total of 97 782 shares including the shares repurchased on 4.8.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1943599]