SS&C Technologies Holdings, Inc.
SS&C Technologies builds software and runs the back-office machinery of finance and healthcare, from trading systems and retirement accounts to pharmacy claims processing, serving tens of thousands of clients including hedge funds and health plans. It began in 1986, when Bill Stone launched the firm as Security Software & Consulting Inc. from the basement of his Connecticut home. A fun twist: it gobbled up Blue Prism, the British firm whose founders actually coined the term "robotic process automation."