| TrainACE | Maryland |
| TrainCaster LMS | Massachusetts |
| Trainerly | Illinois |
| TrainHeroic, Inc. | |
| Training Camp, Inc. | Pennsylvania |
| Training Connection | Illinois |
| Training Technology | Texas |
| Training to You | Arizona |
| TrainingDepartment.com | Missouri |
| TrainingPeaks, LLC | Colorado |
| TrainPlayer Software | California |
| Trainual, Inc. | Arizona |
| Trainyard Tech, LLC | Pennsylvania |
| Traitware | Nevada |
| Trak Software | |
| Trak Systems | Connecticut |
| Trakid, LLC | |
| Traklight, Inc. | Arizona |
| TraknProtect | Illinois |
| Traktek | Massachusetts |
| TrAMPoline Pharma, Inc. | |
| Trana Discovery | North Carolina |
| Tranch | New York |
| Trancon, LLC | Colorado |
| TranCreative | Illinois |
| Trango Networks, LLC | Wisconsin |
| Trango Technologies, Inc. | |
| TraningData.io | California |
| Tranquil Blue Corporation | Florida |
| Tranquil Clinical Research | Texas |
| Tranquil Hosting, Inc. | North Carolina |
| Tranquility Internet | Missouri |
| Trans Astronautica Corporation | |
| Trans International | California |
| Trans Media Corporation | New York |
| Trans-Soft, Inc. | Arizona |
| Trans1 | |
| Trans2000, Inc. | California |
| TransACT Communications, LLC | Washington |
| Transact Holdings, Inc. | Arizona |
| Transact Technologies, Inc. | Connecticut |
| Transactions Marketing, Inc. | Connecticut |
| TransactionTree, Inc. | Georgia |
| TransActPOS | Kentucky |
| TransacXion Technologies, Inc. | Georgia |
| Transak, Inc. | |
| Transamerica Capital, LLC | |
| TransAmerican Medical Imaging | Utah |
| Transatomic Power Corporation | |
| Transcard Payments | Tennessee |