Some of the largest and well-known American-based call center companies include Convergys Corporation, TeleTech Holdings and Stream Global Services, states CallMe! IQ. Tata Consultancy Services, which is headquartered in India, leads the call center industry in terms of total revenue generated in 2013.
With its purchase of Stream Global Services in 2014, Convergys Corporation became the second largest worldwide provider of contact solutions and other call center related services following TCS, notes Statista. The company, which is based in Cincinnati, Ohio, operates from various international locations, including several countries in the Middle East, Europe, Latin and South America, Africa and Asia Pacific.
Other prominent companies in the business process outsourcing sector include Sykes Enterprises and Star Trek, Inc.