Elon Musk's artificial intelligence company, xAI, reportedly reached a valuation of $50 billion just 16 months after its founding in July 2023. It is now worth more than what the billionaire paid for Twitter. Arguably the most well-known name in the AI space, OpenAI, last valued at $157 billion, needed over nine years to achieve the same milestone.

Fidelity marked up the value of its X Holdings shares by 32.37% in October, the largest monthly increase since helping Elon Musk buy the company in 2022. The big picture: Even with the valuation boost,

Fidelity has raised the estimated value of its stake in Elon Musk’s X (formerly Twitter) by 32.37% in October, according to an Axios report. Despite the boost, the social media platform is still valued at nearly 72% less than the $44 billion Musk paid to acquire it in 2022.

Fidelity marked up the value of its holdings in Elon Musk's X by 32.37% in October, Axios reported Sunday, possibly boosted by the social media's stake in xAI.  Despite the markup, Fidelity still values the platform formerly known as Twitter at a 72% discount to the $44 billion Musk purchased it for in 2022.