VAISALA CORPORATION STOCK EXCHANGE ANNOUNCEMENT 10.5.2016 SHARE REPURCHASE 10.5.2016 In the Helsinki Stock Exchange Trade date 10.5.2016 Bourse trade BUY Share VAIAS Amount 2 500 shares Total cost 62.306,50 EUR Average price/ share 24,9226 EUR Highest price/ share 25,20 EUR Lowest price/ share 24,48 EUR Vaisala Corporation now holds a total of 202 009 shares including the shares repurchased on 10.5.2016. On behalf of Vaisala Corporation NORDEA BANK FINLAND PLC Janne Sarvikivi Julius Summanen [HUG#2011399]