VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 17.8.2015 SHARE REPURCHASE 17.8.2015 In the Helsinki Stock Exchange Trade date 17.8.2015 Bourse trade BUY Share VAIAS Amount 1 068 shares Total cost 26 853,40 EUR Average price/ share 25,1436 EUR Highest price/ share 25,20 EUR Lowest price/ share 25,05 EUR Vaisala Corporation now holds a total of 103 583 shares including the shares repurchased on 17.8.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1946084]