VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 22.9.2015 SHARE REPURCHASE 22.9.2015 In the Helsinki Stock Exchange Trade date 22.9.2015 Bourse trade BUY Share VAIAS Amount 1 358 shares Total cost 32.327,50 EUR Average price/ share 23,8052 EUR Highest price/ share 23,90 EUR Lowest price/ share 23,75 EUR Vaisala Corporation now holds a total of 136 916 shares including the shares repurchased on 22.9.2015. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#1953801]