VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 13.5.2015 SHARE REPURCHASE 13.5.2015 In the Helsinki Stock Exchange Trade date 13.5.2015 Bourse trade BUY Share VAIAS Amount 42 shares Total cost 1 010,52 EUR Average price/ share 24.0600 EUR Highest price/ share 24.06 EUR Lowest price/ share 24.06 EUR Vaisala Corporation now holds a total of 45 612 shares including the shares repurchased on 13.5.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1921571]