| Thunder Data Systems, Inc. | Texas |
| Thunder Industries | California |
| Thunder Software, LLC | Ohio |
| Thunderbird | California |
| Thunderbird Technical Service, Inc. | Ohio |
| Thunderbirds.me, Inc. | |
| Thunderbit, Inc. | |
| Thunderbolt Innovation, LLC | |
| Thunderstone Software, LLC | Ohio |
| thundertech.com | Ohio |
| ThunderTix | Texas |
| Thunkable, Inc. | California |
| Thurrot | Massachusetts |
| Thuzio | |
| Thylacine Bio, Inc. | |
| Thymmune Therapeutics | |
| Thynk Ventures | |
| TI-BA Enterprises, Inc. | New York |
| Tia | California |
| Tiamat Sciences | North Carolina |
| Tian Medical, LLC | Illinois |
| Tianmin Shu | |
| TianTi Biotherapeutics | |
| Tiara Consulting Services, Inc. | |
| TIB, N.A. | |
| Tiba Biotech | Massachusetts |
| TIBCO Software, Inc. | California |
| Tibersoft | Georgia |
| TIC Software | New York |
| Ticketleap, Inc. | Pennsylvania |
| Ticketsauce.com, Inc. | |
| TickleTrain | North Carolina |
| TickPick, LLC | |
| ticktBox | California |
| Ticomix, Inc. | Illinois |
| Tidal Commerce, Inc. | Illinois |
| Tidal Cyber | District of Columbia |
| Tidal Labs, Inc. | New York |
| Tidal Media Group, LLC | New Hampshire |
| Tidal Metals | |
| Tidal Software, LLC | Texas |
| Tidalink | California |
| TidalScale, Inc. | California |
| TidalWave Programming, Inc. | Florida |
| TidalWave Software, Inc. | Florida |
| TidBITS Publishing, Inc. | New York |
| Tidehouse | |
| Tidelift, Inc. | Massachusetts |
| Tidepool | |
| Tides Medical | Louisiana |