Elon Musk may soon become the first person with a net worth of $300 billion. The world’s richest man added $36 billion to his fortune earlier on October 25, following an announcement that Hertz Global Holdings Inc is ordering 100,000 electric vehicles from Tesla.

This was the highest single-day gain in the history of the Bloomberg Billionaires Index. With a whopping $289 billion, Elon Musk is now nearly $100 billion richer than Jeff Bezos, the former No. 1 in the Bloomberg Billionaires Index.