VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 25.5.2015 SHARE REPURCHASE 25.5.2015 In the Helsinki Stock Exchange Trade date 25.5.2015 Bourse trade BUY Share VAIAS Amount 300 shares Total cost 7 083,15 EUR Average price/ share 23,6105 EUR Highest price/ share 23,62 EUR Lowest price/ share 23,60 EUR Vaisala Corporation now holds a total of 50 522 shares including the shares repurchased on 25.5.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1923724]