Cancer detection startup Grail has received investments from Jeff Bezos and Bill Gates.
Year founded: 2016
How long it took to become a unicorn: 1 year, 9 months
Total raised: $1.38 billion
Estimated current value: $2.5 billion
Smartphone maker Essential was founded by Android creator Andy Rubin.
Year founded: 2015
How long it took to become a unicorn: 1 year, 11 months
Total raised: $330 million
Estimated current value: $1 billion
Letgo is an online marketplace for used goods.
Year founded: 2015
How long it took to become a unicorn: 2 years
Total raised: $475 million
Estimated current value: $1 billion
Zoox is one of the top-funded autonomous driving car companies in the US.
Year founded: 2014
How long it took to become a unicorn: 2 years
Total raised: $302 million
Estimated current value: $3.5 billion
Source: Bloomberg
Michael Marks served as an interim CEO at Tesla before founding his own construction-supply company, Katerra.
Year founded: 2015
How long it took to become a unicorn: 2 years, 1 month
Total raised: $1.1 billion
Estimated current value: $3 billion
Illumio provides a cloud-based data security service to businesses.
Year founded: 2013
How long it took to become a unicorn: 2 years, 3 months
Total raised: $267 million
Estimated current value: $1.2 billion
Grocery delivery service Instacart connects food retailers with hungry customers.
Year founded: 2012
How long it took to become a unicorn: 2 years, 4 months
Total raised: $1 billion
Currently valued at: $4.4 billion
Opendoor lets homeowners list their houses for sale on its online real estate marketplace.
Year founded: 2014
How long it took to become a unicorn: 2 years, 8 months
Total raised: $320 million
Currently valued at: $1 billion
Airbnb lets homeowners rent out their properties to short-term vacationers.
Year founded: 2008
How long it took to become a unicorn: 2 years, 11 months
Total raised: $3.4 billion
Currently valued at: $31 billion