Basic share information Vaisala has two series of shares: series K and series A shares. Series A shares are traded on the Nasdaq Helsinki?. Vaisala has 36,436,728 shares, of which 6,731,092 are series K shares and 29,705,636 are series A shares. Annual General Meeting 2018 resolved to issue new shares to the shareholders without payment in proportion to their holding so that one (1) new share was issued for each share (split). The record date for the share split was April 12, 2018 and the share spilt was registered into the trade register on April 12, 2018. New shares were issued on April 13, 2018.