It's only been a day, but so far life as a listed company has been kind to Atlassian.

Shares in the Sydney-born and -based, London-domiciled office software company, which completed its IPO this week, finished their first regular hours trading session on the Nasdaq sharply higher.

At 8am ET (4pm New York Time) the stock hit $US27.78, up 32 per cent from the $US21 price at which the company sold shares to big institutional investors.