6. Garrett Camp
Net Worth: $8.58 billion
Change from 2017 Ranking: ▼3.9%
Major company holdings: Uber, Stumbleupon
While best known as a co-founder of Uber, Garrett Camp is now focused on other ventures. Last year, he and a few other partners unveiled Expa Labs, a startup incubator in Silicon Valley. Expa differs from other firms of its kind by accepting just a handful of startups, allowing Camp and his co-founders to spend more time coaching their cohort of fledgling entrepreneurs. To that end, Expa raised US$100 million in funding from investors like Virgin founder Sir Richard Branson and HP CEO Meg Whitman. That’s not to say he’s been left unscathed. Uber’s shares have reportedly dropped 15% this year with their valuation plunging from US$60 billion to US$50 billion.