| Name | Country | Market Cap (US$) |
|---|
| TELBA AG | Germany | Private |
| Telco Systems, Inc. | United States | Private |
| Telcon Fios e Cabos para Telecomunicaçoes S/A. | Brazil | Private |
| TELE MECH K.K. | Japan | Private |
| Tele System Electronic Spa % Tele System Electronic Ag | Italy | Private |
| Telebit Corporation | United States | Private |
| Telechips Corporation | United States | Private |
| Teleco Cavi S.p.A. | Italy | Private |
| TELECOM RESEAUX SERVICES | France | Private |
| TELECOM Y NOVATECNO S.A. | Spain | Private |
| Telecommunications Power Systems | United States | Private |
| Telect, Inc. | United States | Private |
| Teledata Communication Ltd. | Israel | Private |
| TELEDATA NETWORKS LTD | Israel | Private |
| Telefonica Empresas Peru S.A.A. | Peru | Private |
| TELEFUSION COMMUNICATIONS LTD | United Kingdom | Private |
| Telemas Corp Sdn Bhd | Malaysia | Private |
| Telemics, Inc. | United States | Private |
| TELENT BONDING LTD | United Kingdom | Private |
| telent GmbH | Germany | Private |
| Telent plc | United Kingdom | Private |
| Telephone Distributors, Inc. | United States | Private |
| Telephonics Corporation | United States | Private |
| Teletek Electronics JSC | Bulgaria | Private |
| Televic NV | Belgium | Private |
| TeleWare Group Plc | United Kingdom | Private |
| Telex Communications Holdings, Inc. | United States | Private |
| Telica, Inc. | United States | Private |
| Telident, Inc. | United States | Private |
| Tellabs International, Inc | United States | Private |
| Tellabs Oy | Finland | Private |
| Tellium, Inc. | United States | Private |
| Telmag Internacional, S.A. de C.V. | Mexico | Private |
| Telmar Network Technology | United States | Private |
| TELRAD CONNEGY LTD. | Israel | Private |
| Telrad Networks Ltd. | Israel | Private |
| Telson Electronics Co., Ltd. | South Korea | Private |
| Telstrat, Int'l. | United States | Private |
| Teltronic, S.A. | Spain | Private |
| TEMIC TELEFUNKEN microelectronic HUNGARY Korlatolt Felelossegu T | Hungary | Private |
| TENOVIS SAS | France | Private |
| TenXc Wireless, Inc. | Canada | Private |
| Terabit Corporation | United States | Private |
| TERACROSS LTD. | Israel | Private |
| Tesonic-Tottori Sanyo Electric Co., Ltd. | China | Private |
| TEXECOM LTD | United Kingdom | Private |
| Thai Samsung Electronics Co Ltd | Thailand | Private |
| THALES AIR DEFENCE S.A. | France | Private |
| Thales Alenia Spazio S.p.A. | Italy | Private |
| Thales Broadcast & Multimedia, Inc. | United States | Private |
| Thales Communications Belgium SA | Belgium | Private |
| THALES Communications S.A. | France | Private |
| Thales Communications, Inc. | United States | Private |
| Thales e-Transactions SA | France | Private |
| THE EGYPTIAN TELEPHONE COMPANY | Egypt | Private |
| The New Internet Computer Company | United States | Private |
| The SPACECONNECTION, Inc. | United States | Private |
| THOMSON BROADCAST & MULTIMEDIA S.A. | France | Private |
| Thomson Multimídia Ltda. | Brazil | Private |
| Thorn Security Ltd | United Kingdom | Private |
| Thrane & Thrane Norge AS | Norway | Private |
| Tianjin Communication & Broadcasting Group Co., Ltd. | China | Private |
| Tianjin Optical Electrical Communication Technology Co., Ltd. | China | Private |
| Tianjin Samsung Telecommunications Company | China | Private |
| Tiara Networks Inc | United States | Private |
| TIE/Communications, Inc | United States | Private |
| TIM ELECTRONICS SDN BHD | Malaysia | Private |
| Timeplex, Inc | United States | Private |
| Times Microwave Systems, Inc. | United States | Private |
| TIW Systems, Inc. | United States | Private |
| TML Ventures Inc. | Canada | Private |
| TOGU ANZEN KOGYO K.K. | Japan | Private |
| TOHO ELECTRONICS K.K. | Japan | Private |
| Tokyo Pigeon Co., Ltd. | Japan | Private |
| TOKYO RADAR K.K. | Japan | Private |
| Topcall International AG | Austria | Private |
| TOSHIBA ELECTRO-WAVE PRODUCTS CO.,LTD. | Japan | Private |
| TOSHIBA MOBILE COMMUNICATION PRODUCTS K.K. | Japan | Private |
| TOTO OPTRONICS K.K. | Japan | Private |
| TOTSU DENSHI CO.LTD. | Japan | Private |
| TOTTORI STAR DENKI, K.K. | Japan | Private |
| TOUTE LA TELEPHONIE INDUSTRIELLE | France | Private |
| TOWADA AUDIO CORP. | Japan | Private |
| TOWERTEL SPA | Italy | Private |
| TP EMITEL SP Z O O | Poland | Private |
| TRAKCJA POLSKA PKRE S A | Poland | Private |
| Transcept | United States | Private |
| TREXTA TR DERI MAMULLERI SANAYI VE TICARET A S | Turkey | Private |
| Triax A/S | Denmark | Private |
| Tripoint Global Communications Inc | United States | Private |
| Triton Network Systems, Inc. | United States | Private |
| Tropic Networks, Inc. | Canada | Private |
| Tropos Networks | United States | Private |
| Tsuen Shing Electronics (Zengcheng) Co., Ltd. | China | Private |
| TSUKIDEN INDUSTRY CO.,LTD. | Japan | Private |
| TSURYO TECHNICA CORPORATION | Japan | Private |
| TSX Corporation | United States | Private |
| TUNSTALL ELECTRONICS LTD | United Kingdom | Private |
| Tunstall Group Ltd. | United Kingdom | Private |
| TUNSTALL TRUSTEE CO LTD | United Kingdom | Private |
|
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