VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 11.8.2015 SHARE REPURCHASE 11.8.2015 In the Helsinki Stock Exchange Trade date 11.8.2015 Bourse trade BUY Share VAIAS Amount 250 shares Total cost 6 190,05 EUR Average price/ share 24,7602 EUR Highest price/ share 24,95 EUR Lowest price/ share 24,30 EUR Vaisala Corporation now holds a total of 100 215 shares including the shares repurchased on 11.8.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1944968]