| TekTel, Inc. | Kentucky |
| TekTone | North Carolina |
| Tektronix, Inc. | Oregon |
| Tekvox | |
| TekWissen, LLC | Michigan |
| Tekyz, Inc. | Arizona |
| Tekzen | |
| TEL Electronics, Inc. | Utah |
| Tel-Comp Solutions | Pennsylvania |
| Tel-Instrument Electronics Corporation | New Jersey |
| TELA Bio, Inc. | Pennsylvania |
| TELAdjust | Michigan |
| Teladoc Health, Inc. | New York |
| Telaid | Connecticut |
| Telamon | Indiana |
| Telan Corporation | Pennsylvania |
| Telanalysis | Virginia |
| Telania, LLC | Kentucky |
| Telapprise | California |
| Telaria, Inc. | New York |
| Telasip Corporation | Virginia |
| TelAthena Systems | New York |
| Telavant Internet Services | Montana |
| Telcept, LLC | Virginia |
| Telchemy | Georgia |
| Telco Data, Inc. | Texas |
| Telco Depot | New York |
| Telco Enterprises | California |
| Telco Ltd | Arizona |
| Telco Systems | Massachusetts |
| Telcom & Data, Inc. | Wisconsin |
| Telcom Corporation | Florida |
| Telcom Technologies Associates | Mississippi |
| Telcom-Data, Inc. | Wisconsin |
| Telcom.Net | Florida |
| TelCon Associates, Inc. | Kansas |
| Teldata Communications, Inc. | Maryland |
| Tele-Dynamics Systems, Inc. | Georgia |
| Tele-Tech Services, Inc. | South Carolina |
| TeleAdvice, Inc. | Georgia |
| TeleBright Software Corporation | Maryland |
| Telebyte NW | Washington |
| Telebyte, Inc. | New York |
| TeleChoice | California |
| TeleCMI | Delaware |
| Teleco of Wilmington | Delaware |
| Teleco, Inc. | South Carolina |
| Telecom Audio, Inc. | Illinois |
| Telecom Brokerage, Inc. | Illinois |
| Telecom Buyer | Colorado |