Musk is the first person to reach a net worth of US$400 billion (AU$628 billion), and according to the Bloomberg Billionaires Index, was recently boosted by about $50 billion through an insider share sale of SpaceX.

Musk’s net worth has seen a huge turnaround following the election of Donald Trump, who has aligned himself with. Mus-owned Tesla saw its stocks surge by nearly 65 per cent since the election.

Musk’s artificial intelligence startup, xAi, has also reached $50 billion in value, which is almost double the amount raised in May.

Despite his huge net worth, it could rise to over $500 billion, if Musk can overturn a judge’s decision to dismiss a 2018 Tesla pay package worth more than $100 billion.

A Delaware judge has reaffirmed her ruling that Tesla must revoke Elon Musk's multibillion-dollar pay package.

Chancellor Kathaleen St. Jude McCormick on Monday denied a request by lawyers for Musk and Tesla's corporate directors to vacate her ruling earlier in 2024 requiring the company to rescind the unprecedented pay package.

McCormick also rejected an equally unprecedented and massive fee request by plaintiff lawyers, who argued that they were entitled to legal fees in the form of Tesla stock valued at more than $US5 billion ($A7.8 billion). The judge said the lawyers were entitled to a fee award of $US345 million ($A535 million).

The rulings came in a lawsuit filed by a Tesla stockholder who challenged Musk's 2018 compensation package.

McCormick concluded in January that Musk engineered the landmark pay package in sham negotiations with directors who were not independent. The compensation package initially carried a potential maximum value of about $US56 billion ($A87 billion), but that sum has fluctuated over the years based on Tesla's stock price.

Following the original court ruling, Tesla shareholders met in June and ratified Musk's 2018 pay package for a second time, again by an overwhelming margin.

With AAP.