VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 13.5.2016 SHARE REPURCHASE 13.5.2016 In the Helsinki Stock Exchange Trade date 13.5.2016 Bourse trade BUY Share VAIAS Amount 288 shares Total cost 7.298,93 EUR Average price/ share 25,3435 EUR Highest price/ share 25,35 EUR Lowest price/ share 25,34 EUR Vaisala Corporation now holds a total of 203 299 shares including the shares repurchased on 13.5.2016. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#2012760]