AT&T is a holding company. Through its subsidiaries, the company is a provider of telecommunications, media and technology services. The company's Communications segment provides wireless and wireline telecom, video and broadband services. The company's WarnerMedia segment includes media and entertainment businesses that principally develop, produce and distribute feature films, television content, and other content globally; and operate digital media properties. The company's Latin America segment provides entertainment services in Latin America and wireless services in Mexico. The company's XANDR segment relies on using data from its customer relationships, to develop digital and video advertising that is relevant to consumers.

Comcast is a media and technology company. The company's segments are: Cable Communications, which provides internet, video, voice, and security and automation services in the United States individually and as bundled services at a discounted rate over its cable distribution system to residential and business customers; NBCUniversal, which includes a portfolio of national cable networks that provide a variety of entertainment, news and information, and sports content, regional sports and news networks, international cable networks, and cable television studio production operations; and Sky, which owns a portfolio of pay television channels that provide entertainment, news, sports and movies.

Frontier Communications is a holding company. Through its subsidiaries, the company is a provider of communications services. The company conducts business with both consumer and commercial customers. For consumer customers, the company provides broadband, video, voice and other services and products. The company delivers these services over a combination of fiber and copper-based networks. The company's commercial customers consist of: small, medium and larger enterprise customers, whereby the company provides services including broadband service, Ethernet service, circuit-based services, SD-WAN, and managed Wi-Fi; and wholesale customers, which buy both voice and data services to supplement their own network infrastructure.

CenturyLink, via its subsidiaries, is a communications company engaged in providing an array of integrated services to its business and residential customers. The company's segments include: International and Global Accounts Management, which provides products and services to global enterprise customers; Enterprise, which provides products and services to regional domestic and global enterprises; Small and Medium Business, which provides products and services to small and medium businesses directly and through its indirect channel partners; and Wholesale, which provides products and services to other communication providers across the wireline, wireless, cable, voice and data center sectors.

Swisscom is engaged in providing telecommunication services and is active in Switzerland and Italy. Co. has three operating divisions: Swisscom Switzerland, Fastweb; and Other Operating Segments. Co.'s Swisscom Switzerland divisions comprised of: Residential Customers; Small and Medium-Sized Enterprises; Enterprise Customers; Wholesale; and IT, Network & Innovation. Co.'s Fastweb segment supplies its fixed-network both directly via its own fiber-optic network and also via the unbundled fixed-access lines and wholesale products. Co.'s other operating segments provides ICT solutions for physicians, hospitals and insurers, develops and operates intelligent solutions for energy management.