 CSG International has four subsidiaries : CSG Systems , CSG Systems Software and CSG Services . Its subsidiaries offer products and services , while the parent company , CSG Systems International Inc. is listed on the NASDAQ stock exchange . As of 2013 , its largest clients were Comcast , DISH and Time Warner , representing 19 , 15 and 11 percent of its revenues respectively . CSG spends approximately 15 percent of its revenues on research and development . Its revenues are about 72 percent from payment processing and related services , 16 percent from software and the remainder for ongoing technical support . 89 percent of revenues are from the Americas . 
