GTCR
http://www.gtcr.com/GTCR is a private equity firm with $8 billion in equity and mezzanine capital under management. The firm focuses on the transaction processing, consumer products and services, healthcare, technology, and business services and outsourcing sectors. Since its inception, the firm has invested in more than one hundred companies and taken more than thirty companies public. GTCR is based in Chicago, IL and was founded in 1980.