It’s finally happened: after months of speculation, Atlassian has gone public. The startup listed on the NASDAQ for US$21 a share, raising $440 million and closing its first day of trading with shares up by more than 32 percent at $27.78 after hitting a high of $28.05. The closing price left the startup valued at $5.8 billion, up from the company’s valuation of $3.3 billion earlier this year.