David Sitsky co-founded Nuix with Tony Castagna. They built software in Sydney that makes large piles of unstructured data searchable. Nuix gives 2000 as its founding year. Nuix Australia Pty Ltd was incorporated on 15 November 2005.
The company began small. In 2006 it had two developers. Ten years later it had more than 400 staff. Several features of its search engine were patented in 2011.
In 2013 Nuix gave free licences to the International Consortium of Investigative Journalists for the Offshore Leaks investigation. In 2016 its software helped turn 2.6 terabytes of scanned Panama Papers documents into something reporters could search.
Nuix joined the ASX in December 2020 in an offer that valued the company at about A$1.8 billion. Macquarie Group held roughly 30% at the time.