| tCognition, Inc. | Massachusetts |
| TCP Software | Texas |
| TCPaaS | Illinois |
| TCR Software | Arizona |
| TCS Communications Corporation | Massachusetts |
| TCS Consultants, Inc. | Texas |
| TCS Education System | Illinois |
| TCS Marketing Group, Inc. | Colorado |
| TCS Software, Inc. | Ohio |
| TCS Technologies | Oregon |
| TCS Tele-Communication Systems, Inc. | Utah |
| TCS, LLC | Illinois |
| TCSN.net | California |
| TCT | Kansas |
| TCT International | New Jersey |
| TCV | California |
| TCW-GAV | Pennsylvania |
| Td Communications, Inc. | California |
| TD Information Technologies | Florida |
| TD Innovations, Inc. | Illinois |
| TD2 Precision Oncology | Arizona |
| Tdata, Inc. | Ohio |
| TDC Marketing | |
| TDC Tele Data Com, Inc. | New York |
| TDengine | California |
| TDF Ventures | Maryland |
| TDI Technologies, Inc. | Texas |
| TDK Technologies, LLC | Missouri |
| TDK Ventures, Inc. | |
| TDL.com | California |
| TDM | Kentucky |
| TDO Software, Inc. | California |
| TDS Telecommunications, LLC | Wisconsin |
| TDS, Inc. | Georgia |
| TDX Tech | Minnesota |
| TE Technology, Inc. | Michigan |
| Teachable, Inc. | New York |
| Teachable, Inc. | |
| TeachBoost | |
| TeachBoost | |
| Teachers 'N Tools | Alabama |
| Teaching Strategies, LLC | Maryland |
| Teachley, LLC | |
| TeachTown, Inc. | |
| Teacup Software | New York |
| Teacup Tech Systems | |
| Teak | |
| Teakwood Capital | |
| Teal | California |
| Teal Drones | |