Elon Musk just became the first person ever worth $800 billion or more after his rocket maker SpaceX acquired his artificial intelligence and social media company xAI. Forbes estimates that the deal, which values the combined company at $1.25 trillion, boosted Musk’s fortune by $84 billion, to a record $852 billion.

SpaceX on Monday acquired xAI, the AI startup that also owns the X social media platform, in a deal combining two companies owned by Elon Musk

The deal brings together two of the largest closely held companies in the world. XAI raised funds at a $230 billion valuation in January, while SpaceX was set to go ahead with a share sale in December at a valuation of about $800 billion, Bloomberg reported.