VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 30.9.2015 SHARE REPURCHASE 30.9.2015 In the Helsinki Stock Exchange Trade date 30.9.2015 Bourse trade BUY Share VAIAS Amount 1 000 shares Total cost 23.825,70 EUR Average price/ share 23,8257 EUR Highest price/ share 23,90 EUR Lowest price/ share 23,72 EUR Vaisala Corporation now holds a total of 138 924 shares including the shares repurchased on 30.9.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1955788]