| Name | Country | Market Cap (US$) |
|---|
| Skyframes Inc | United States | Private |
| Skyline Telephone Membership Corporation | United States | Private |
| SkyLynx Communications | United States | Private |
| SkyOnline, Inc. | United States | Private |
| Skypath Networks, Inc. | United States | Private |
| SkyPilot Network, Inc. | United States | Private |
| Skytel Corp. | United States | Private |
| Skyway Communications Holdings Corporation | United States | Private |
| Smart City Finance Llc | United States | Private |
| Smart City Holdings Llc | United States | Private |
| Smart City Networks Lp | United States | Private |
| Smart City Telecommunications Llc | United States | Private |
| Smart Communications Inc. | Philippines | Private |
| Smart Funding Corp | United States | Private |
| Smartone 3G Limited | Hong Kong | Private |
| Smartone Services Limited | Hong Kong | Private |
| Smartone Telecommunications Limited | Hong Kong | Private |
| Smartray Network Incorporated | United States | Private |
| SMARTS ZAO | Russia | Private |
| Smi International Corporation | United States | Private |
| Smith Bagley Inc | United States | Private |
| Smithville Telephone Co Inc | United States | Private |
| Snet Diversified Group, Inc | United States | Private |
| SNT Nederland B.V. | Netherlands | Private |
| SOCIETE DES TELECOMMUNICATIONS DU MALI | Mali | Private |
| Societe Europeenne | France | Private |
| Societe Francaise du Radiotelephone (SFR SA) | France | Private |
| SOCIETE NATIONALE DE TELECOMMUNICATION | Tunisia | Private |
| Societe Nationale de Telecommunication | Tunisia | Private |
| Society for Worldwide Interbank Financial Telecommunications | Belgium | Private |
| Softbank Telecom Corporation | Japan | Private |
| Solomon Alliance Group | United States | Private |
| Sonera Carrier Networks Oy | Finland | Private |
| Sonera Mobile Networks Oy | Finland | Private |
| Sonera Yhtyma Oyj | Finland | Private |
| Song Networks Oy | Finland | Private |
| Sonitrol Corporation | United States | Private |
| SONY ERICSSON MOBILE COMMUNICATIONS IBERIA SL. | Spain | Private |
| Soon Communications Plc | Finland | Private |
| Source Media, Inc. | United States | Private |
| Source Xplorer Clm Llc | United States | Private |
| South Carolina Telecommunications Group Holding Llc | United States | Private |
| South Central Rural Telephone Cooperative Corporation, Inc. | United States | Private |
| South Central Utah Telephone Association, Inc | United States | Private |
| Southern New England Telecom | United States | Private |
| SOUTHGATE DEVELOPMENTS LTD | United Kingdom | Private |
| Southwestern Bell Internet Services | United States | Private |
| Southwestern Bell Messaging Services Inc | United States | Private |
| Southwestern Bell Mobile Systems, Llc | United States | Private |
| Southwestern Bell Tel. (Kansas) | United States | Private |
| Spacenet, Inc. | United States | Private |
| Specialty Teleconstructors, Inc. | United States | Private |
| Spectrasite Communications, Inc. | United States | Private |
| SpectraSite Inc. | United States | Private |
| Spectrasite International Inc | United States | Private |
| Spectrasite, Llc | United States | Private |
| Spectronics Corp | United States | Private |
| SPECTRUM CHILE PTY. LIMITED | Australia | Private |
| Spectrum Resources Towers LP | United States | Private |
| SPIE COMMUNICATIONS | France | Private |
| Splitrock Services, Inc. | United States | Private |
| Spring Communications, Inc. | United States | Private |
| Spring Tide Networks Inc | United States | Private |
| Sprint (North Carolina) | United States | Private |
| Sprint (Total Business Services) | United States | Private |
| Sprint Communications Company L.P. | United States | Private |
| Sprint Corporation (PCS Group) | United States | Private |
| Sprint International Incorporated | United States | Private |
| Sprint Spectrum L.P. | United States | Private |
| Sprint Spectrum Lp | United States | Private |
| Sprint/Centel-North Carolina | United States | Private |
| Sprint/Central Telephone Co.-Nevada | United States | Private |
| Sprint/United Telephone-Eastern | United States | Private |
| Sprint/United Telephone-Midwest | United States | Private |
| Sprint/United Telephone-N. Central | United States | Private |
| SPRINTLINK U K LTD | United Kingdom | Private |
| Srbija BK-PTT DOO | Yugoslavia | Private |
| St. Joe Communications, Inc. | United States | Private |
| Stadtwerke Mannheim AG (SMA) | Germany | Private |
| Star One S/A. | Brazil | Private |
| Star Technology Services Ltd | United Kingdom | Private |
| StarBand Communications, Inc. | United States | Private |
| Starcom Holdings Inc | United States | Private |
| Stargate.net, Inc. | United States | Private |
| Starter S.A. | Chile | Private |
| State Communications | United States | Private |
| STE COMMERCIALE TELECOMMUNICAT SCT SARL | France | Private |
| STE FRANCAISE DU RADIOTELEPHONE SFR | France | Private |
| Stentor plc | Republic of Ireland | Private |
| STN Inc. | Canada | Private |
| Stonebridge Wireless Inc | United States | Private |
| Strategic Concepts Corp | United States | Private |
| Stratos Global Inc | Canada | Private |
| Stream Intelligent Networks Corporation | Canada | Private |
| Streetdelivery.Com, Inc | United States | Private |
| Sugar Land Telephone Company | United States | Private |
| Sumcom Wireless | United States | Private |
| SunCom Wireless Holdings Inc | United States | Private |
| SunCom Wireless, Inc. | United States | Private |
| Sunrise Communications AG | Switzerland | Private |
|
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