VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 17.6.2015 SHARE REPURCHASE 17.6.2015 In the Helsinki Stock Exchange Trade date 17.6.2015 Bourse trade BUY Share VAIAS Amount 2 079 shares Total cost 49 019,08 EUR Average price/ share 23,5782 EUR Highest price/ share 23,61 EUR Lowest price/ share 23,36 EUR Vaisala Corporation now holds a total of 65 519 shares including the shares repurchased on 17.6.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1929328]