Comcast Corporation, formerly registered as Comcast Holdings, is the largest broadcasting and cable company in the world by revenue. It is the largest cable company and home Internet service provider in the United States, and the nation's third largest home telephone service provider. Comcast services residential and commercial customers in 40 US states and the District of Columbia. The company is headquartered in Philadelphia, Pennsylvania. As the owner of the international media company NBCUniversal since 2011, Comcast is also a producer of film and television contents, operates cable channels, national channels, the major film studio Universal Pictures, and Universal Parks & Resorts. Comcast also has significant holding in digital distribution. In February 2014 the company agreed to merge with Time Warner Cable in an equity swap deal worth $45.2 billion. Under the terms of the agreement Comcast is to acquire 100% of Time Warner Cable. Comcast has been criticized for a number of reasons. Comcast's customer satisfaction often ranks among the lowest in the cable industry.