| AddThis | New Jersey |
| Adducive | Wisconsin |
| AddVant Networking VoIP | New Jersey |
| Addvocate | South Carolina |
| Addy AI, Inc. | |
| Addy Osmani | |
| ADE, Inc. | Michigan |
| Adecto Pharmaceuticals | |
| Adeia, Inc. | |
| Adeira Pharma | |
| ADEK Technical Sales, Inc. | New Hampshire |
| Adela, Inc. | California |
| AdelFi | |
| Adello | California |
| Adelphi Agency | Florida |
| Adelphi University Computer Science | New York |
| Adelphi University Mathematics | New York |
| Adelphic Mobile | Massachusetts |
| Adelson Digital, LLC | Florida |
| Ademero, Inc. | Florida |
| Adenin Technologies, Inc. | Massachusetts |
| Adentro, Inc. | California |
| Adept | California |
| Adept Creative, LLC | |
| Adept Developer, LLC | |
| Adept Software, Inc. | Florida |
| Adept Solutions | California |
| Adept Technologies, Inc. | Vermont |
| Adeptia | Illinois |
| AdeptID | Massachusetts |
| AdeptPlus | |
| 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 |