VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 3.9.2015 SHARE REPURCHASE 3.9.2015 In the Helsinki Stock Exchange Trade date 3.9.2015 Bourse trade BUY Share VAIAS Amount 1 857 shares Total cost 45.090,67 EUR Average price/ share 24,2815 EUR Highest price/ share 24,31 EUR Lowest price/ share 24,20 EUR Vaisala Corporation now holds a total of 124 745 shares including the shares repurchased on 3.9.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1949685]