| Name | Country | Market Cap (US$) |
|---|
| Teltronic, S.A. | Spain | Private |
| TEMIC TELEFUNKEN microelectronic HUNGARY Korlatolt Felelossegu T | Hungary | Private |
| TenXc Wireless, Inc. | Canada | Private |
| Terabit Corporation | United States | Private |
| TERACROSS LTD. | Israel | 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 New Internet Computer Company | United States | Private |
| The SPACECONNECTION, Inc. | United States | Private |
| THOMSON BROADCAST & MULTIMEDIA S.A. | France | Private |
| Thorn Security Ltd | United Kingdom | Private |
| Thrane & Thrane Norge AS | Norway | Private |
| Tianjin Communication & Broadcasting Group Co., Ltd. | China | Private |
| Tianjin Samsung Telecommunications Company | China | Private |
| TIE/Communications, Inc | United States | 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 |
| Tomen America, Inc. | United States | 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 |
| 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 |
| 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 |
| TSURYO TECHNICA CORPORATION | Japan | Private |
| TSX Corporation | United States | Private |
| TUNSTALL ELECTRONICS LTD | United Kingdom | Private |
| Tunstall Group Ltd. | United Kingdom | Private |
| TUNSTALL VITALCALL LTD | United Kingdom | Private |
| Turin Networks, Inc. | United States | Private |
| Tut Systems, Inc. | United States | Private |
| Tx Rx Systems Inc | United States | Private |
| Tyco International (US) Inc. | United States | Private |
| TYCOM Ltd. | Bermuda | Private |
| Tymphany Corporation | United States | Private |
| U S Traffic Corporation | United States | Private |
| U.S. Monolithics, LLC | United States | Private |
| U.S. Order, Inc. | United States | Private |
| U.S. Robotics Corporation | United States | Private |
| UAGH, Inc | United States | Private |
| Ubinetics Ltd | United Kingdom | Private |
| Ultratec Inc | United States | Private |
| UNICATION CO., LTD. | Taiwan | Private |
| United Industrial Corporation | United States | Private |
| Universal Multimedia | France | Private |
| Universal Solutions, LLC | United States | Private |
| Urmet Domus Spa | Italy | Private |
| URO DENSHI KOGYO K.K. | Japan | Private |
| US Telecom, Inc. | United States | Private |
| USA Talks.com, Inc. | United States | Private |
| USA Wireless Technologies, Inc | United States | Private |
| UTStarcom (China) Ltd. | China | Private |
| UTStarcom Telecom Co.,Ltd. | China | Private |
| V Band Corporation | United States | Private |
| V-Bits Inc | United States | Private |
| Valcom Inc | United States | Private |
| Valeo Securite Habitacle S.A. | France | Private |
| Vallent Corporation | United States | Private |
| Vanguard Networing Products Inc | United States | Private |
| VBrick Systems, Inc. | United States | Private |
| Veccom Co., Ltd. | Taiwan | Private |
| Verimation AB | Sweden | Private |
| Verint Systems Ltd. | Israel | Private |
| Vertical Networks, Inc. | United States | Private |
| Viagate Technologies Inc | United States | Private |
| Vianet Technologies, Inc. | United States | Private |
| Vicorp Limited | United Kingdom | Private |
| VIDEAL Gesellschaft zur Herstellung von audio-visuellen Produkte | Germany | Private |
| Video Guidance, Inc. | United States | Private |
| Videojet Technologies GmbH | Germany | Private |
| Viewsonics Inc | United States | Private |
| VINA Technologies, Inc. | United States | Private |
| VISION FIRE & SECURITY PTY LTD | Australia | Private |
| VISLINK COMMUNICATIONS LTD | United Kingdom | Private |
| Vista 2000 Inc | United States | Private |
| VitalCom, Inc. | United States | Private |
|
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