VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 21.10.2015 SHARE REPURCHASE 21.10.2015 In the Helsinki Stock Exchange Trade date 21.10.2015 Bourse trade BUY Share VAIAS Amount 1 800 shares Total cost 43.542,40 EUR Average price/ share 24,1902 EUR Highest price/ share 24,27 EUR Lowest price/ share 24,00 EUR Vaisala Corporation now holds a total of 160 240 shares including the shares repurchased on 21.10.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1960565]