AT&T is a provider of telecommunications, media, entertainment, and technology services for consumers, content creators, distributors, and advertisers.
Comcast is a media and technology company that offers video, high-speed Internet, and voice services to residential and business customers, as well as Ethernet network services and cellular backhaul services to mobile network operators.
Charter Communications is a broadband connectivity company and cable operator that offers its services to consumers and businesses under the branding of Spectrum.
Liberty Global is a cable company providing video, broadband internet, fixed-line telephony, mobile, and other communications services to residential customers and businesses.