HQ: San Francisco
CEO: Mikkel Svane
New Funding: $60 million
Backers: Redpoint Ventures, Index Ventures, GGV Capital, Goldman Sachs, Charles River Ventures, Benchmark Capital, Matrix Partners, Silicon Valley Bank
Zendesk provides cloud-based customer service software -- helpdesk in the cloud, as it's referred to colloquially -- and has more than 20,000 customers, according to the company. According to Zendesk, its monthly recurring revenues have grown about 500 percent since November 2010, the last time it took in VC money.