Mexican tycoon Carlos Slim, Microsoft's Bill Gates and Zara fashion house boss Amancio Ortega of Spain have topped the Forbes list of the world's wealthiest billionaires.
Gina Rinehart is the highest-ranked Australian, coming in at number 36 with $US17 billion ($16.75 billion), followed by Rupert Murdoch at 91 with $US11.2 billion.
James Packer ranks 198th with $US6 billion, Andrew "Twiggy" Forrest is 211th with $US5.7 billion, Frank Lowy is 229th with $US5.3 billion and Harry Triguboff is 276th with $US4.5 billion, according to the business magazine.
Slim, who controls Latin American telecommunications power America Movil and retail/industrial group Grupo Carso, came in first among the mega-rich for the fourth straight year, with a fortune estimated at $US73 billion, up $US4 billion from a year ago.
Microsoft chairman Gates, a perennial top finisher in the list, placed second with $US67 billion, up $US8 billion from 2012.
Ortega, whose Inditex fashion group includes the popular Zara chain, vaulted from the seventh position into the third spot. His wealth is now estimated at $US57 billion, rocketing from $US31 billion a year ago.
Slim and Gates were also in the top two spots last year.
Warren Buffett, chief of US conglomerate Berkshire Hathaway, ranked fourth with $US53.5 billion, and Larry Ellison, chief executive of US technology company Oracle, rated fifth with $US43 billion.
Asia's richest man, Li Ka-shing, came in eighth with $US31 billion. He owes his fortune to his sprawling transportation, trading and energy businesses.