Last week, news broke that Slack was raising a new round of investment that would value the young company at a jaw-dropping $2.76 billion.
That would make Slack the second most valuable enterprise startup in the world, according to valuation expert PitchBook. (By "enterprise startup" we mean a company that primarily sells tech to businesses as opposed to consumers.)
We asked PitchBook to send us a full list of the most valuable enterprise startups in the world, along with details from public filings on the investments.
No. 16: Okta is worth $787 million

Company: Okta
Current valuation: $786.71 million
Location: San Francisco
What it does: Okta offers a cloud service that helps companies manage employee passwords/logins to other cloud services.
Total amount raised: $155 million
Last raise: The company raised $75 million, at $11.86/share, in a Series E funding led by Sequoia Capital on June 9, 2014.
Valuation before last round of funding: $711.71 million.
Other major investors: Andreessen Horowitz, Greylock Partners, Khosla Ventures, Janus Capital Group and Altimeter Capital also participated.
No. 15: MixPanel is worth $853 million

Company: Mixpanel
Current valuation: $853.43 million
Location: San Francisco
What it does: Mixpanel offers an analytics service that helps companies measure and analyze the performance of mobile and other business apps.
Total amount raised: $77 Million
Last raise: The company raised $65 million of Series B venture funding at 37.54/share from Andreessen Horowitz on December 18, 2014.
Valuation before last round of funding: $788.43 million
Major investors: Altimeter Capital Management, Andreessen Horowitz (Marc Andreessen), Greylock Partners (Aneel Bhusri), Janus Capital Group, Khosla Ventures, Sequoia Capital (Patrick Grady)
No. 14: Qualtrics is worth $1 billion

Company: Qualtrics
Current valuation: $1 billion (estimated)
Location: Provo, Utah
What it does: A cloud service for performing sophisticated employee and customer feedback surveys.
Total amount raised: $220 million
Last raise: The company raised $150 million of Series B venture funding from lead investor Insight Venture Partners on September 24, 2014. Accel Partners and Sequoia Capital also participated.
Valuation before last round of funding: $850 million
Other major investors: Accel Partners (Ryan Sweeney), Sequoia Capital (Bryan Schreier), Insight Venture Partners (Jeffrey Lieberman).
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