Comcast Corporation (NASDAQ: CMCSA) is an American telecommunications and media conglomerate. It is the biggest cable company biggest broadband Internet provider in the United States. In 2016, Comcast reported nearly $80.4 billion in revenue. Comcast has a market cap of about $172.2 billion as of Nov 14, 2017.

1. Comcast Cable Communications, LLC

Comcast Cable Communications, LLC, a wholly owned subsidiary of Comcast Corporation, operates a hybrid coaxial and fiber-optic data network through which it offers cable television, Internet, voice communication and home automation services primarily under the Xfinity brand. The company has two subsidiaries, Comcast Business and Comcast Wholesale, both of which offer specialized networking services targeted at business customers.

At the close of 2016, Comcast Cable's primary services were available to 56.4 million homes and businesses in 40 U.S. states. Of those potential customers, about 27 million, or nearly 50%, subscribed to one or more Xfinity services. 

2. NBCUniversal Media, LLC

NBCUniversal Media, LLC, is Comcast Corporation's media, content and entertainment arm. The company owns and operates numerous media properties, including broadcast networks, cable networks, movie studios and theme parks. It is a wholly owned subsidiary of Comcast Corporation.

NBCUniversal Media operates the broadcast networks NBC and Telemundo, both of which air across all 50 U.S. states. The company owns local affiliate NBC stations in 10 U.S. cities and local affiliate Telemundo stations in 17 U.S. cities. NBCUniversal also owns and operates a variety of cable news, sports and entertainment networks, including MSNBC, CNBC, the Golf Channel, E! and USA Network. NBCUniversal Media has a 25% stake in the cable network The Weather Channel and a 32% stake in the online video streaming service Hulu.

NBCUniversal Media's movie studio, Universal Studios, Inc., is one of the country's largest studios by revenue. The company produces, markets and distributes its own films and acquires distribution rights to films produced by other companies. Universal Pictures has several film production subsidiaries, including Focus Features and Illumination Entertainment. NBCUniversal Media's theme park business, Universal Parks and Resorts, operates theme parks in Orlando, Florida, and Hollywood, California.

3. Comcast Spectacor

Comcast Spectacor is a live sports and entertainment company based in Philadelphia, Pennsylvania, the same city where its parent is headquartered. Spectacor owns the Philadelphia Flyers, an NHL hockey team, and operates the Wells Fargo Center sports and entertainment arena. Comcast Spectacor's subsidiary, Spectra, offers comprehensive venue management services to arenas, convention centers, performing arts venues and other entertainment facilities in 46 U.S. states and in other countries around the world.

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