Atlassian is definitely Australian. But if we count them, there are a lot more Australian tech businesses worth more than US$1B: Acconex was just bought by Orac

Atlassian is definitely Australian. But if we count them, there are a lot more Australian tech businesses worth more than US$1B: Acconex was just bought by Oracle for US$1.2B, and we have tech businesses from the last web boom like Seek.com (~US$5B), or going even further back, businesses like MYOB (~US$1.7B).