THE $10 BILLION CLUB: Meet the 7 most valuable startups in the US

But when too many startups became unicorns, a new class of startups emerged: "decacorns," companies valued at over $10 billion.

These are the Ubers and Airbnbs of the world, the startups that steadfastly remain private companies as they seek more millions in funding at higher and higher valuations.

Following are the US startups valued at more than $10 billion.

7. Dropbox

Valuation: $10 billion

CEO Drew Houston

Dropbox reached its $10 billion valuation in 2014 after a $617 million funding round. Since then, the company has shifted its focus to business customers, launching Dropbox Enterprise last year.

The company began to cut back on lavish spending an employee perks in 2016, something that was costing the company $25,000 per year per employee. While Dropbox doesn't disclose its financials, it's reported to have generated more than $500 million in revenue last year. CEO Drew Houston said in June that the company is free cash flow positive now, which is a milestone for a fast-growth tech company.

Various reports have pegged a Dropbox IPO as taking place sometime in 2017.

6. Pinterest

Valuation: $11 billion

CEO Ben Silbermann

In May 2015, Pinterest raised a $533 million Series G funding round from investors like Andreessen Horowitz, First Mark, and Goldman Sachs, bumping the San Francisco-based company's valuation up to $11 billion.

Rumors swirled throughout 2016 that Pinterest was on the brink of going public, and in October, the company named its first chief financial officer, a signal that Pinterest could be inching closer to an IPO.

5. SpaceX

Valuation:$12 billion

CEO Elon Musk

After raising a $1 billion funding round from Fidelity and Google in January 2015, Elon Musk's SpaceX reached a $12 billion valuation.

Less than a year later, SpaceX made history when it launched its Falcon 9

4. WeWork

Valuation: $18 billion

WeWork cofounders Miguel McKelvey and Adam Neumann

Coworking startup WeWork raised $300 million in funding from SoftBank this past March, putting its valuation at about $18 billion and making it the fourth-most-valuable startup in the US.

WeWork has hinted at going public in 2017, and may also buy up a few smaller companies in the meantime, according to Fortune's Erin Griffith.

3. Palantir

CEO Alex Karp

as a player in Edward Snowden's revelations about government spying help the US find Osama bin Laden,to find the Boston Marathon bombers.

But Palantir recently ran into trouble with the Department of Labor, and the company agreed to pay $1,659,434 in back wages and stock options

2. Airbnb

Valuation: $31 billion

CEO Brian Chesky, product chief Joe Gebbia, CTO Nathan Blecharczyk.

Home-rental startup Airbnb had a challenging 2016, but the company is still the second most-valuable startup in the US.

Airbnb faced legal setbacks in San Francisco and New York last year, but also raised a massive, $850 million round of funding and launched a new service called Trips in November with the intent of becoming a more full-service travel company.

In March of 2017, Airbnb raised a $1 billion funding round that valued the company at $31 billion. Now, Airbnb is reportedly keeping a close eye

1. Uber

Valuation: $68 billion

CEO Travis Kalanick

Uber is the most valuable startup in the US and across the globe, outpacing the valuation of its arch-rival, by nearly $20 billion.

The ride-hailing startup raised several billion dollars in recent years, including $3.5 billion from a Saudi Arabian investment fund and $2 billion in the form of a leveraged loan. Uber announced in May that it lost

Finances aside, Uber has had a fraught 2017

THE $10 BILLION CLUB: Meet the 7 most valuable startups in the US

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