National Cable Communications is an advertising sales firm specializing in spot cable. Spot cable advertising involves the purchasing of commercial time on various cable networks in order to target specific markets and geographical areas. The company s offerings allow advertisers to reach the entire United States, select regions, individual markets and portions of individual markets. The company is jointly owned by Comcast Cable Communications, Cox Communications and Time Warner Cable. In addition, National Cable Communications represents Adelphia Media Services, Charter Media, Cablevision, Bright House, OnMedia, Insight and CableOne. The company is headquartered in New York and employs more than 500 people throughout its 15-plus offices. One of the company s regional offices is located in Chicago.