Gaps in the company records of glamour tech company Nuix have raised questions about former finance professor Anthony Castagna’s $3000 investment which he turned into an $80 million windfall.

Dr Tony Castagna joined investment powerhouse Macquarie Bank as a full-time consultant in 1998. About seven years later his experience working in Silicon Valley was employed to turn around Nuix which was struggling at the time. When Macquarie took a substantial stake in the business in 2011, their interests were aligned.