Bill Gates achieved this in 1999 when he reached $90 billion while Warren Buffett was at $36 billion, and was close in 2001. The Walton family also achieved this in 1993 and 1994.

As of December 2, 2024 the net worth of the five richest individuals in the world was
Elon Musk: $353B
Jeff Bezos: $231B
Mark Zuckerberg: $210B
Larry Ellison: $198B
Bernard Arnault: $171B

As of Dec 15, 2025 Elon Musk has $509 billion and Larry Page has $252 billion. (per Forbes).

This is missing about $160 billion from the higher $800 billion valuation of SpaceX. Still showing about $400 billion from the July 2025 valuation of Spacex. Also, not showing the new XAI price of $230 billion.

Bloomberg is also showing a lower number for Elon. Bloomberg has Elon today at $470 billion and Larry Page at $266 billion. Elon would need to get to about $532 billion for double in Bloomberg. The Bloomberg numbers are from pricing yesterday and is up $17 today which is about $14 billion to his net worth or about $484 billion. Google is down 0.7% today. This puts Larry Page at about $264 billion.

The XAI price of $230 billion should be officially recognized when the funding round closes Dec 19, 2025. It might take until the Monday after to have the billionaire tracking lists to recognize it. The xAI funding round is targeted to close on December 19, 2025, raising $15 billion at a $230 billion pre-money valuation (implying ~$245 billion post-money).

Current Valuations Used by Lists (as of mid-December 2025)

Bloomberg Billionaires Index — Values xAI (post-merger with X, as XAI Holdings) at approximately $105 billion (after applying a 15% private-company liquidity discount). Musk's stake is estimated at **33%**, contributing roughly $35 billion (pre-discount equivalent ~$41 billion) to his net worth.