These are the 21 richest American entrepreneurs under 40 - and they all made their fortunes in tech
21. Orion Hindawi
Net Worth: $1 billion
Orion Hindawi made his fortune through the security startup, Tanium, where he is CTO. Tanium was valued at $3.5 billion after raising $120 million in September. Hindawi works with his father David, who was one of the founders of the startup, and the two previously worked together at David's last company, BigFix, which IBM bought for a reported $400 million in 2007.
Sheth is cofounder and president of Vista Equity, the technology-focused private equity firm founded in 2000. He is actively involved in his company’s investments and sits on 16 separate boards of Vista Equity funded businesses. Sheth additionally serves as a director at Waterfall Mobile, MarVista Entertainment, and Global Wildlife Conservation.
Silicon Valley bad boy Sean Parker was the cofounder of Napster and founding president of Facebook. He also serves on the board of Spotify, and has been helping to build Brigade, an app that aims to revamp civic engagement.
9. Joe Gebbia
Net Worth: $3.3 billion
Joe Gebbia is Airbnb's chief product officer, and was the one that brought the company's two other cofounders together. Gebbia describes Airbnb's genesis as "three airbeds, a pop-tart breakfast, welcoming hosts and an insider’s guide to the city." Now it's a force that's transforming the way we think about travel.
8. Brian Chesky
Net Worth: $3.3 billion
Brian Chesky is the CEO of Airbnb, and met cofounder Joe Gebbia while they were students as RISD (The Rhode Island School of Design). Chesky studied industrial design. The friendship stuck and the pair later decided to found Airbnb after mutually quitting their jobs while living in San Francisco.
Airbnb's CTO and cofounder Nathan Blecharczyk started coding when he was 12. He was talked into joining the creation of Airbnb by his former roommate, Joe Gebbia. Before Airbnb, Blecharczyk was a product manager at Microsoft.
6. Elizabeth Holmes
Net Worth: $4.5 billion
Elizabeth Holmes dropped out of Stanford when she was a sophomore to found the healthcare startup Theranos. Built on secretive medical technology, Holmes turned Theranos into a powerhouse company and became America's youngest woman billionaire — at least on paper. But recently, there has been controversy over how effective Theranos' proprietary technology actually is.
5. Travis Kalanick
Net Worth: $6 billion
Travel Kalanick is the feisty CEO and cofounder of Uber. His company has fought rivals and regulators as it has transformed from a black-car service into a sprawling logistics company gunning for a future of self-driving cars.
4. Garrett Camp
Net Worth: $6.6 billion
Before cofounding Uber, Garrett Camp helped create the web discovery platform StumbleUpon. The Canadian entrepreneur seems to always have his hand in a variety of projects. He is also the founder of Expa, a startup studio that helps other founders launch their own products.
3. Jan Koum
Net Worth: $8.8 billion
Jan Koum is the cofounder and CEO of WhatsApp, the hugely popular mobile messaging platform Facebook bought in 2014 for $19 billion. Koum is originally from Ukraine and moved with his family to the US when he was 16 years old. His family initially struggled in their new country, living on welfare and food stamps. Perhaps this is one reason Koum is said to be incredibly down-to-earth, especially about his newfound wealth.