Three years ago, Sam Altman lit the fuse for what's become the most explosive bull run in the history of tech startups with the launch of ChatGPT.

Along with OpenAI's rapid rise to a $500 billion valuation, other prominent names like SpaceX, Anthropic and Anduril have seen astronomical markups of late. In total, a basket of seven of the highest-valued private tech companies is now worth $1.3 trillion on paper, almost doubling in the past year, according to Forge Global, which provides a marketplace for private investments.

Forge's value assessments are based on trading activity as well as funding round valuations and tender offers.

That number is continuing to grow. On Friday, CNBC's David Faber reported that Elon Musk's xAI is raising $10 billion at a $200 billion valuation, just m

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