| Alta DiagnoTech | |
| Alta Vista Technology, LLC | Michigan |
| Alta Web Works | Washington |
| Altabos | |
| Altacent | |
| Altaeros | |
| Altagenics | |
| AltaGrade, LLC | Washington |
| Altair Engineering, Inc. | Michigan |
| Altairzen, LLC | |
| Altametrics | California |
| Altamira | Virginia |
| Altamira Consulting Services, Inc. | |
| Altana AI | New York |
| Altanine | |
| Altanova, LLC | New York |
| AltaPoint | Utah |
| Altara | California |
| Altaris, LLC | |
| Altarum | |
| AltaThera Pharmaceuticals, LLC | |
| Altaviz | California |
| Altavize | |
| Altaworx, LLC | Alabama |
| Altay Therapeutics | |
| Altec Comptuer Solutions | Missouri |
| Altec Design | Missouri |
| Altec Lansing | Pennsylvania |
| Altech Companies | Texas |
| Altech Electronics, Inc. | New York |
| Altech Star, Inc. | New Jersey |
| Altegra Technologies, LLC | Alabama |
| ALTEN Technology USA | |
| Alter Imaging | North Carolina |
| Altera Corporation | |
| Altered Digital | |
| Altered Images | Wyoming |
| AlterG | |
| AlterG, Inc. | California |
| AlterHosting, LLC | Idaho |
| Alterian | Illinois |
| Alterion, Inc. | Pennsylvania |
| AlterMedia, Inc. | California |
| Alternate Image, Inc. | Florida |
| AlternateAccess | North Carolina |
| Alternative BioMedical Solutions | Texas |
| Alternative Energy Store, Inc. | Massachusetts |
| Alternative Personal Computer Services | California |
| Alternative Solutions | Massachusetts |
| Alternative Solutions for Reliable Online Commerce, LLC | New York |