| AT&T Corporation | concern, business, enterprise | Boston, Texas, 550 Madison Avenue, Dallas, United States, 195 Broadway, New York City, Bedminster | March 3, 1885 |
| AT&T Mobility | mobile network operator, telecommunications company | Atlanta | 2001 |
| Bell Telephone Company | business | — | July 9, 1877 |
| Cisco | business, enterprise, public company | San Jose | 1984 |
| Comcast | telecommunications company, business, enterprise, public company | Philadelphia | June 28, 1963 |
| Crown Castle International Corp. | organization, real estate investment trust, company, public company | Houston | January 1, 1994 |
| Level 3 Communications | business, enterprise, public company | Frankfurt | 1985 |
| Nexstar Media Group | media conglomerate, business, public company | Irving | June 17, 1996 |
| Sprint Corporation | mobile network operator, business, enterprise, public company | Overland Park | 1899 |
| U.S. Cellular | business, enterprise, public company | Chicago | 1983 |
| Vonage | business, public company | Holmdel Township | 2001 |
| Western Electric | organization, business, enterprise | New York City | 1869 |
| Western Union | business, financial institution, public company | Denver | April 1856 |
| Yahoo Inc. | division, business, new media, company | Sunnyvale, New York City | 2006 |