Tesla CEO Elon Musk has once again reclaimed top spot as the world’s richest person with a net worth of $399 billion, according to the Bloomberg Billionaires Index. He overtook Oracle co-founder Larry Ellison within hours of briefly losing the top spot on Wednesday, September 10.
Ellison, who is now trailing Musk with a fortune of $363 billion, briefly overtook him after a historic rally in Oracle’s stock. Oracle’s stock surged more than 35% to $328 per share on September 10, its best single-day performance since 1992. The rally translated into an unprecedented $101 billion personal gain for Ellison, who owns a 41% stake in the company. This marks the largest single-day gain ever recorded in Bloomberg’s Billionaires Index.
Tesla drives Musk’s wealth
Elon Musk who also leads Forbes’ 400 ranking of richest Americans has added $184 billion to his fortune in past 12 months.
Tesla, his largest publicly listed asset, has seen shares rise 56% since last year’s ranking, despite a 13% decline in vehicle sales in the first half of 2025 and the failure of its robo-taxi pilot in Austin. Most of the gains came in late 2024 when investor enthusiasm over Musk’s ties with then president-elect Donald Trump drove shares higher. Still, Tesla stock is now down about 25% from its December peak.
Musk’s $168 billion stake in SpaceX
Musk’s space company, SpaceX, has significantly boosted his wealth. According to Forbes, Its valuation has doubled to $400 billion from $210 billion a year ago, based on a recent $1 billion tender offer. Musk’s 42% stake is now worth $168 billion.
Starlink, SpaceX’s satellite internet arm, serves 6 million customers and generated $9.3 billion in revenue last year, according to Morgan Stanley.
xAI-X merger adds to fortune
In March, Musk merged his artificial intelligence startup xAI with X, further increasing his wealth. Investors currently value X at $33 billion and xAI at $80 billion, with Musk’s combined stake worth around $60 billion. According to Forbes, he is now targeting a valuation of over $200 billion for xAI in its next funding round.
Musk – Ellison close ties
Despite currently competing for the top spot, Musk and Ellison share close ties. According to Bloomberg, Ellison holds a stake in Tesla, where Musk serves as CEO, and sat on the company’s board between 2018 and 2022. He also invested $1 billion in Musk’s purchase of Twitter, now rebranded as X.