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.

October saw a 32.37% jump in X's valuation, marking the biggest monthly increase since Fidelity helped Musk buy Twitter for $44 billion in 2022, Axios said.