According to reports, as of Thursday, Musk's net worth was about USD 192 billion, with Arnault's USD 187 billion
Index data showed behind Musk and Arnault are Jeff Bezos and Bill Gates at USD 144 billion and USD 125 billion, respectively
He rebounded this year with gains valued at more than USD 55.3 billion, as Tesla rallied 66 per cent year-to-date
The index is a daily ranking of the world's wealthiest people