VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 7.9.2015 SHARE REPURCHASE 7.9.2015 In the Helsinki Stock Exchange Trade date 7.9.2015 Bourse trade BUY Share VAIAS Amount 2 000 shares Total cost 49.973,63 EUR Average price/ share 24,9868 EUR Highest price/ share 25,00 EUR Lowest price/ share 24,95 EUR Vaisala Corporation now holds a total of 128 269 shares including the shares repurchased on 7.9.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1950303]