X owner Elon Musk has become the first person ever worth $600 billion.
Forbes announced this on Monday, December 15, 2025, on the heels of reports that SpaceX startup was likely to go public at a valuation of $800 billion.
Musk, who was the first to surpass $500 billion in net worth in October, owns an estimated 42% stake in SpaceX, which is preparing to go public next year.
His wealth also got a boost from his roughly 12% stake in EV maker Tesla, shares of which have risen 13% so far this year, despite flagging sales.
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They were up nearly 4% on Monday after Musk said the company was testing robotaxis without safety monitors in the front passenger seat.
In November, Tesla shareholders approved a $1 trillion pay plan for Musk, the largest corporate pay package in history, as investors endorsed his vision of morphing the EV maker into an AI and robotics juggernaut.
His artificial-intelligence startup xAI is also in advanced talks to raise $15 billion in fresh equity at a valuation of $230 billion, according to a media report.
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