| Tryon and Associates | Oklahoma |
| Tryten Technologies, Inc. | Washington |
| TRYTN | Tennessee |
| TS Design Studio | |
| TS Imagine, Inc. | |
| TS, Inc. | California |
| TS-Radio.com | California |
| TSB Web Hosting | Utah |
| TSC Electronics Ltd | California |
| TScan Therapeutics | |
| tscircuit, Inc. | |
| TSD | Massachusetts |
| TSEG | Texas |
| TSĒVO, LLC | Texas |
| TSFactory | North Carolina |
| TSG | West Virginia |
| TSG Invest, LLC | |
| TSG Networks | California |
| TSI Applications | Arizona |
| TSI One | |
| TSI Online | Louisiana |
| TSI Technology Solutions | Illinois |
| TSItouch | Pennsylvania |
| TSL Electronics, Inc. | California |
| TSL Marketing | Maryland |
| TSL Solutions, LLC | Arizona |
| TSL, Inc. | Florida |
| TSM | Michigan |
| TSP IT Services | Massachusetts |
| TSR, Inc. | Pennsylvania |
| TSRL, Inc. | Michigan |
| TSS Consulting Ltd | Arizona |
| TSS Digital Services, Inc. | Washington |
| TSS Paratransit | California |
| TSS, Inc. | Maryland |
| TST Tooling Software Technology, LLC | Michigan |
| Tstream Software | Michigan |
| Tsunami Development, LLC | Texas |
| Tsunami Tsoftware, Inc. | Florida |
| tSunela | Missouri |
| TSVC Management, LLC | California |
| Tsymmetry | District of Columbia |
| TSYS Merchant Solutions, LLC | Georgia |
| TT Software | New Jersey |
| TTCP Management Services, LLC | Minnesota |
| TTE Filters, LLC | New York |
| TTEC | Colorado |
| TTI Medical | California |
| TTI, Inc. | Texas |
| TTM Communications, Inc. | California |