VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 5.6.2015 SHARE REPURCHASE 5.6.2015 In the Helsinki Stock Exchange Trade date 5.6.2015 Bourse trade BUY Share VAIAS Amount 150 shares Total cost 3 634,80 EUR Average price/ share 24,2320 EUR Highest price/ share 24,60 EUR Lowest price/ share 24,00 EUR Vaisala Corporation now holds a total of 60 290 shares including the shares repurchased on 5.6.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1926752]