HQ: San Francisco
CEO: Jack Dorsey
New Funding: $200 million
Backers: Citi Ventures, Rizvi Traverse Management, Starbucks Coffee Company, others
Talk about growth: mobile payments provider Square said it now has more than 400 employees and is processing over $8 billion in payments on an annualized basis, up from 150 employees and $1 billion less than a year earlier. It's also got plenty of cash thanks to this $200 million infusion, and a rock-star deal to be the payments provider of choice for some 7,000 U.S. Starbucks locations starting this fall. Goodbye, cash register?