VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 12.5.2016 SHARE REPURCHASE 12.5.2016 In the Helsinki Stock Exchange Trade date 12.5.2016 Bourse trade BUY Share VAIAS Amount 500 shares Total cost 12.813,80 EUR Average price/ share 25,6276 EUR Highest price/ share 25,67 EUR Lowest price/ share 25,44 EUR Vaisala Corporation now holds a total of 203 011 shares including the shares repurchased on 12.5.2016. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#2012382]