India, Feb. 13 -- A corporate merger in Australia, between pharmacy franchiser Chemist Warehouse and publicly-listed Sigma Healthcare, has turned a former intern into a billionaire. The deal between the two companies has also created one of Australia's largest pharmacy chains and wholesalers.

The biggest winners in this deal are Chemist Warehouse's Founders - Jack Gance and his brother Sam - and Mario Verrocchi, who had joined the company as an intern in 1980 and progressed to become its chief executive.

According to Bloomberg, the Gance brothers and Verrocchi are each worth $2.5 billion after shares of the combined entity began trading on Thursday. The merger not only helped these three people but also turned 100 of Chemist Warehouse's...