| AtaiBeckley, Inc. | |
| ATAK Interactive, Inc. | California |
| Atalanta Therapeutics | |
| Atalasoft | Massachusetts |
| Atama Plus, Inc. | |
| Ataman Software, Inc. | Colorado |
| Atanasoft, LLC | Iowa |
| Atara Biotherapeutics, Inc. | |
| Ataraxis | New York |
| Atavistik Bio | Massachusetts |
| ATB Technologies | Missouri |
| ATC | Iowa |
| ATC Automation | Tennessee |
| ATC Broadband | Georgia |
| ATC Communications | Idaho |
| ATCi | Arizona |
| atCommunications, LLC | Illinois |
| ATConsulting | California |
| ATD Computer Solutions | North Carolina |
| AtData | |
| Atdoc | California |
| Atea Pharmaceuticals, Inc. | |
| Atea Pharmaceuticals, Inc. | |
| ATEC Spine, Inc. | California |
| Atec, Inc. | |
| Atech Flash Technology, Inc. | California |
| Ategenos Pharmaceuticals | |
| ATEK Access Technologies | Minnesota |
| Atelier Commerce | |
| Atelier Ventures | Pennsylvania |
| Atemis, LLC | California |
| Atempo | California |
| Aten Software, LLC | Wisconsin |
| Atengen, Inc. | |
| Ateon | Nevada |
| Atesso | |
| ATG Computer Solutions | Texas |
| ATG Pharma, Inc. | |
| ATG Solutions, LLC | |
| ATG USA | Arkansas |
| ATGG Labs, LLC | Maryland |
| Athelas, Inc. | California |
| Athelon Corporation | New Jersey |
| Athelstan | Texas |
| Athena Alliance | |
| Athena Archiver | New York |
| Athena Bioscience, LLC | Georgia |
| Athena Computer Power Corporation | California |
| Athena Discovery, Inc. | California |
| Athena IT Solutions | Massachusetts |