VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 27.5.2016 SHARE REPURCHASE 27.5.2016 In the Helsinki Stock Exchange Trade date 27.5.2016 Bourse trade BUY Share VAIAS Amount 5 000 shares Total cost 139.961,00 EUR Average price/ share 27,9922 EUR Highest price/ share 28,10 EUR Lowest price/ share 27,90 EUR Vaisala Corporation now holds a total of 223 427 shares including the shares repurchased on 27.5.2016. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#2016295]