Lucy Guo is one of just six self-made female billionaires on the planet under the age of 40. She’s also the only one who’s made the bulk of her fortune from a company she left years ago. Guo cofounded artificial intelligence firm Scale AI in 2016; after leaving the company in 2018, she astutely held on to most of her stake while pursuing her next startup. Guo still owns an estimated stake of just under 5% of Scale AI worth nearly $1.2 billion. Add in her other assets—including her holding in her second startup, Passes—and she’s worth $1.25 billion, Forbes estimates. “I don’t really think about it much, it’s a bit wild. Too bad it’s all on paper haha,” says Guo via text in response to her new billionaire status.
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