| 3C Network Consultants | Florida |
| 3C Software | Georgia |
| 3Circle Media | |
| 3Cloud | Illinois |
| 3clx.com | Florida |
| 3Core Software, Inc. | Texas |
| 3Core Systems, Inc. | Texas |
| 3CPM Company, Inc. | Maryland |
| 3CX Academy | Georgia |
| 3D Biotek, LLC | New Jersey |
| 3D Cloud by Marxent | Florida |
| 3D Control Systems Ltd | California |
| 3D Digital | |
| 3D Enterprises, Inc. | Ohio |
| 3D Extreme, Inc. | Illinois |
| 3D Group | California |
| 3D Health Solutions | |
| 3D Inspection System | Florida |
| 3D Net Productions | Florida |
| 3D Perception | Florida |
| 3D Source | Illinois |
| 3D State | New York |
| 3D Systems, Inc. | South Carolina |
| 3D-Rex & AniRex Studios, Inc. | |
| 3D-Rex Studios | Illinois |
| 3Data | Texas |
| 3Daughters | Massachusetts |
| 3DBio Therapeutics | Florida |
| 3DBioCAD | Washington |
| 3DEO, Inc. | Massachusetts |
| 3Derm | Massachusetts |
| 3DFortify, Inc. | Massachusetts |
| 3DiVi, Inc. | California |
| 3DLabs Inc. Ltd | California |
| 3DLOOK, Inc. | New York |
| 3dMD, LLC | Georgia |
| 3DMedia Corporation | North Carolina |
| 3DNature | Colorado |
| 3DPrint.com | New York |
| 3DR, Inc. | California |
| 3dRudder | New York |
| 3DStats.com | New Jersey |
| 3DTada, Inc. | |
| 3DTek | Florida |
| 3DTL, Inc. | California |
| 3DUS | |
| 3DV | Oregon |
| 3E Technology, Inc. | New York |
| 3Essentials, Inc. | North Carolina |
| 3fold Communications, LLC | California |