Chemist Warehouse’s two billionaire founders, Jack Gance and Mario Verrocchi, are set to climb several rungs up the Financial Review Rich List if they pull off their proposed merger with ASX-listed Sigma Healthcare.

Documents associated with the merger, which will create an $8.8 billion giant with more than 1000 company-owned or franchised pharmacies, show for the first time the precise shareholdings of Mr Gance and Mr Verrocchi, who founded the entity that became Chemist Warehouse in 1995.