| TFC Therapeutics | |
| TFD Group | California |
| TFD ReveraGen BioPharma, Inc. | |
| TFPSoft, LLC | Arizona |
| TG Daily | California |
| TG Labs | |
| TG Therapeutics, Inc. | |
| TG Web Media | Florida |
| TG3 Electronics, Inc. | Wisconsin |
| TGFI, Inc. | Indiana |
| TGGS, Inc. | Virginia |
| TGGWEB | Vermont |
| TGI | Massachusetts |
| TGI Direct | |
| TGI Software | Florida |
| TGS | Massachusetts |
| TGS Web Design | New Mexico |
| TH Design, Inc. | Ohio |
| Thabble, LLC | |
| Thaddeus Computing | Iowa |
| Thaddeus Stevens College of Technology | Pennsylvania |
| Thaeres, Inc. | |
| Thales e-Security | Florida |
| Thalorin, Inc. | |
| Thankful Group, LLC | |
| Thankster, Inc. | |
| Thanx, Inc. | California |
| Tharimmune, Inc. | New Jersey |
| Tharo Systems, Inc. | Ohio |
| Tharstern, Inc. | Georgia |
| THAT Agency | Florida |
| That Clean Life, Inc. | |
| That Guy Who Fixes Computers | |
| That One Firm, Inc. | |
| That Random Agency | |
| That Software Guy, Inc. | |
| That's Us Technologies | Florida |
| Thatch | California |
| Thatch Computer Consulting | Michigan |
| Thatch Health, Inc. | |
| Thatcher Technology Group | Illinois |
| thatgamecompany | California |
| Thatsthename.com | North Carolina |
| Thayer Medical | |
| The 13 Ventures | New York |
| The 215 Guys | |
| The 24 Media Agency | |
| The 24-Hour Site | |
| The 3 Geeks, Inc. | Oklahoma |
| The Abbi Agency | |