Sam Hupert, one of Australia’s more understated billionaires, was pounding the pavement in Sydney this week meeting investors in his radiology imaging company, Pro Medicus.

His story is not a hard sell given the company is growing profits and revenues 30 per cent annually, has no debt and pays solid dividends. While the stock’s high valuation suggests its stellar run cannot last forever, there is no sign Hupert’s strategy is losing momentum.