| Adeptrix Corporation | Massachusetts |
| AdeptSource | California |
| Adequasys | Delaware |
| Aderant | Florida |
| Aderas, Inc. | Virginia |
| Adesis, Inc. | Delaware |
| AdEspresso, Inc. | California |
| Adesso AI | California |
| Adesso Solutions | California |
| Adesys | Wisconsin |
| Adex Electronics, Inc. | California |
| Adexa, Inc. | California |
| AdExcel.com | California |
| AdExchanger | New York |
| Adexin | |
| AdEz Software | Michigan |
| AdFarm | North Dakota |
| Adfish | California |
| AdForum MayDream, Inc. | New York |
| Adfuel | |
| AdGate Media | |
| AdGlare | |
| Adgraph Design | California |
| Adhancer | California |
| AdHawk | New York |
| AdhereTech, Inc. | New York |
| Adhezion Biomedical | Pennsylvania |
| ADI Computer Solutions | Arizona |
| ADial Pharmaceuticals, Inc. | Virginia |
| Adiant | New Jersey |
| Adicet Bio | California |
| Adicio | California |
| Adient Medical, Inc. | Texas |
| Adimab, LLC | New Hampshire |
| Adina R&D, Inc. | Massachusetts |
| AdInfusion | |
| ADInstruments | Colorado |
| Adioma | California |
| Adionics | |
| Adipo Therapeutics | Indiana |
| Adirondack Federal Credit Union | |
| Adirondack Networks, Inc. | New York |
| Adiso Therapeutics | New Jersey |
| Adistec | Florida |
| Adit | |
| Adit Software | New York |
| Adit Software | New York |
| Aditude | New York |
| Aditx, Inc. | Virginia |
| Adium | Florida |