| 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. | |
| 3DV | Oregon |
| 3E Bioventures Capital | |
| 3E Technology, Inc. | New York |
| 3engines, LLC | |
| 3Essentials, Inc. | North Carolina |
| 3fold Communications, LLC | California |
| 3Forge, LLC | New York |
| 3G Capital | |
| 3Headed Monster, LLC | |
| 3Helix, Inc. | Utah |
| 3i Data Scraping | |
| 3i People, Inc. | Georgia |
| 3Innovative, Inc. | |
| 3K Technologies | California |
| 3LD, Inc. | |
| 3Lines Venture Capital | Colorado |
| 3LINX Unified Commerce | New York |
| 3LizardsMedia.com | Arizona |
| 3M | Minnesota |
| 3Metas Corporation | Colorado |
| 3Nines Technologies, Inc. | Oklahoma |
| 3P&T Security Recruiting, LLC | Washington |
| 3PH Alliance | |
| 3Pillar Global | Virginia |
| 3PL Central, LLC | California |
| 3Play Media | Massachusetts |
| 3PMobile | |
| 3PRIME, LLC | Connecticut |
| 3Q Digital | California |
| 3rd Dimension Systems, Inc. | Minnesota |
| 3rd Edge | |
| 3rd Millennium, Inc. | Massachusetts |
| 3rd Planet, LLC | |
| 3rd St. Web | Arizona |
| 3rd Studio | Washington |
| 3rd3rd | |
| 3Rivers WebTech | |
| 3sixty Market View | California |
| 3Sixty Pharma Solutions | |
| 3Sixty, LLC | |
| 3Spine, Inc. | Tennessee |