Tesla CEO Elon Musk has become the first person in history to achieve a net worth of nearly half a trillion dollars. The richest person on the planet is now worth $500.1 billion, according to Forbes' Real-Time Billionaires tracker. The former advisor to US President Donald Trump became the first person ever worth $400 billion or more in December. His net worth is $150 billion more than that of runner-up Larry Ellison, the co-founder of Oracle.