VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 18.5.2016 SHARE REPURCHASE 18.5.2016 In the Helsinki Stock Exchange Trade date 18.5.2016 Bourse trade BUY Share VAIAS Amount 4 500 shares Total cost 114.400,35 EUR Average price/ share 25,4223 EUR Highest price/ share 25,50 EUR Lowest price/ share 25,19 EUR Vaisala Corporation now holds a total of 209 299 shares including the shares repurchased on 18.5.2016. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#2013699]