VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 4.9.2015 SHARE REPURCHASE 4.9.2015 In the Helsinki Stock Exchange Trade date 4.9.2015 Bourse trade BUY Share VAIAS Amount 1 524 shares Total cost 37.167,96 EUR Average price/ share 24,3884 EUR Highest price/ share 24,48 EUR Lowest price/ share 24,21 EUR Vaisala Corporation now holds a total of 126 269 shares including the shares repurchased on 4.9.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1949967]