VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 11.5.2016 SHARE REPURCHASE 11.5.2016 In the Helsinki Stock Exchange Trade date 11.5.2016 Bourse trade BUY Share VAIAS Amount 502 shares Total cost 12.708,28 EUR Average price/ share 25,3153 EUR Highest price/ share 25,67 EUR Lowest price/ share 24,50 EUR Vaisala Corporation now holds a total of 202 511 shares including the shares repurchased on 11.5.2016. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#2011933]