40. Square

Mobile payment processing and lending

Square, the online payment-processing company, is helping small businesses compete with their bigger rivals. The company was started in 2009 by Twitter co-founder Jack Dorsey and blasted onto the scene with its small, square-shaped credit card reader. It plugs into smartphones and makes it easier for small businesses to accept credit card payments. The company charges small businesses a flat fee of 2.75 percent for each payment it processes, with Square claiming it processed more than $30 billion in payments last year in the U.S., Canada and Japan.

Read MoreFULL LIST: 2015 DISRUPTOR 50

Now the company is expanding its offerings in order to capture more of the small-business market. Last year it introduced Square Capital, a lending program that loans smaller firms from $3,000 to $10,000. So far, the company says it has advanced "tens of millions of dollars" to thousands of small-business owners in the U.S. Square has also raised more than $500 million in financing from Khosla Ventures, Sequoia Capital and Kleiner Perkins Caufield & Byers.

Jack Dorsey, co-founder and CEO of Square.
Source: Square
Jack Dorsey, co-founder and CEO of Square.
"The quote that captures the way I have thought about building the picture I want to see in the world is by Steve McQueen: 'When I believe in something I fight like hell for it.' That is my life." -Jack Dorsey, co-founder

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