
The buw Holding GmbH was an owner-run German company based in Osnabrück acquired by Convergys through a definitive merger. It is especially known for its call centres and has altogether about 6,000 employees who work in Osnabrück, Münster, Halle, Schwerin, Berlin, Leipzig, and Wismar in Germany, Pécs in Hungary, and Timișoara and Cluj in Romania.

CGI Inc., also known as CGI Group Inc., is a Canadian multinational information technology (IT) consulting and systems integration company headquartered in Montreal, Quebec, Canada.

Computer Sciences Corporation (CSC) was an American multinational corporation that provided information technology (IT) services and professional services. On April 3, 2017, it merged with the Enterprise Services line of business of HP Enterprise to create DXC Technology.

Contact Centre Cymru is a bilingual Contact Centre, based in Penrhyndeudraeth, North Wales. Owned and managed as a business unit of PTI Cymru Ltd, they provide a Contact Centre service to a range of businesses across Wales and the UK, including Traveline Cymru., Bwcabus, First Cymru, Severn Trent Water, National Rail Enquiries and Arriva Trains Wales.
Convergys Corporation was a corporation based in Cincinnati, Ohio, that sold customer management and information management products, primarily to large corporations. Customer management products included agent assisted, self-service and care software tailored to the communications, financial services, technology, retail, healthcare and government markets. Information management provided convergent billing and business support system (BSS) products and services including revenue management, product and order management, and customer care management to telecom, utilities, and cable/satellite/broadband service providers. They had approximately 130,000 employees across 33 countries.

Datapoint Corporation, originally known as Computer Terminal Corporation (CTC), was a computer company based in San Antonio, Texas, United States. Founded in July 1968 by Phil Ray and Gus Roche, its first products were, as the company's initial name suggests, computer terminals intended to replace Teletype machines connected to time sharing systems.

Firstsource Solutions Limited is an Indian business process management company headquartered in Mumbai, India. It is owned by RP-Sanjiv Goenka Group. Firstsource provides business process management in the banking and financial services, customer services, telecom and media, and healthcare sectors. Its clients include financial services, telecommunications and healthcare companies. Firstsource hosts operations in India, US, UK, and the Philippines.

Founded in 1997 in Miami, Florida is a leading BPO organization. Inktel boasts an impressive portfolio of clients including Fortune 500 companies spanning various industries, established government agencies, and public sector clients. Inktel Holdings serves as the parent company which includes Inktel Contact Center Solutions—focused on Omni-Channel services for private sector clients, Inktel Government BPO—focused on Omni-Channel services for public sector and government clients, and Buena Vista Digital Partners—a stand-alone marketing and advertising agency.

iQor is a business process outsourcing company which provides customer service, third-party collections and accounts receivable management. Although its headquarters are located in St. Petersburg, Florida, the company operates about 40 call centers in North America, Europe, and Asia. Since 2014, iQor has shifted to an end-to-end customer support organization, when iQor acquired the aftermarket services division of Jabil Circuit. Services provided vary from consumer electronics, to medical devices.

Kura is a contact centre company based in Glasgow, Scotland. They provide outsourced contact centre services and software, including customer service, retention, win-back, up-sell, cross-sell, web chat, complaints handling, appointment setting, general customer management and software development.

Minacs is a business and technology outsourcing company with headquarters in Oshawa, Canada; Farmington Hills, United States; and Bangalore, India.

NCO Group, Inc., based in Horsham, Pennsylvania, United States, is a business process outsourcing company and collection agency that provides accounts receivable management, customer relationship management and back office solutions for its clients. Founded in 1926, it was a publicly traded company from 1996 through 2006, when it was purchased by One Equity Partners (OEP), the private investment arm of JP Morgan Chase & Co., and other co-investors.

The SELLBYTEL Group is a global outsourcing company specializing in sales, service, support, human resources, training, back office and home office solutions. In Germany, the company is based in Nuremberg, Munich, Erfurt, Duesseldorf, Meerbusch, Schwalbach, Boblingen and Berlin.

Sitel is a privately owned contact center company headquartered in Miami, Florida. It provides outsourced sales, technical support, customer service, and other business processes for large companies. The company has 160,000 employees and $1.7 billion in revenue.

StorageMart is a chain of self-storage facilities headquartered in Columbia, Missouri that operates facilities across the USA, Canada and the UK. StorageMart was founded in 1999 by Gordon Burnam, who had been involved in the self-storage industry since 1974.

Sykes Enterprises, Incorporated, stylized as SYKES, is an American multinational business process outsourcing provider headquartered in Tampa, Florida. The company provides business process outsourcing (BPO) services, IT consulting, and IT-enabled services, such as technical support and customer service.
Transcom WorldWide AB is a Swedish outsourcing company which provides customer care, sales, technical support, and collections services through an extensive network of contact centers and work-at-home agents.

TTEC is an American customer experience technology and services company headquartered in Englewood, Colorado, founded by Kenneth D. Tuchman in 1982. As of 2021, TTEC has almost 61,000 employees, operating in 22 countries. Annual revenue for 2019 was reported at $1.644 billion.