| Ambit Analytics, Inc. | California |
| Ambit Electronics, Inc. | New York |
| Ambition Insight | |
| Ambition Solutions, Inc. | Tennessee |
| Ambitios Technology Partners, Inc. | California |
| Ambitious Games, Inc. | Michigan |
| Ambitious Web Services | |
| AMBOSS | New York |
| Ambra Health | New York |
| Ambri, Inc. | Massachusetts |
| Ambriel Technologies | Virginia |
| Ambros Therapeutics, Inc. | |
| Ambrosia Biosciences, Inc. | |
| Ambrosia Ventures | |
| Ambrx | California |
| Ambry Genetics | California |
| Ambulero, Inc. | Florida |
| AMC Computer Services | Louisiana |
| AMC Technology, LLC | Virginia |
| AMCOM Communications, Inc. | Maryland |
| AMD Biotech, Inc. | |
| AMD Communications, Inc. | New Hampshire |
| AMD Global Telemedicine, Inc. | Massachusetts |
| AMD Medical Billing and Credentialing Services, Inc. | New Jersey |
| AmData | Mississippi |
| AME Computers, LLC | Nebraska |
| AME Software Products, Inc. | California |
| Ameex Technologies Corporation | Illinois |
| Amelia | New York |
| Amelicor | Utah |
| Amelio studio | New York |
| Amend Surgical | Florida |
| Amenify Corporation | |
| Ameranth, Inc. | California |
| Ameresco, Inc. | Massachusetts |
| Ameri-Tel, Inc. | New Jersey |
| Ameri100 | New Jersey |
| America Innovates | |
| America One Technologies, Inc. | Massachusetts |
| America's Seed Fund | Virginia |
| America's Software Corporation | New York |
| American Academy of Arts and Sciences | |
| American Academy of Forensic Sciences | Colorado |
| American Academy of Pediatrics | |
| American Accurate Components, Inc. | California |
| American Aerospace Controls | |
| American Aerospace Materials Manufacturing Center | |
| American AgCredit | |
| American Association for Cancer Research | |
| American Association of University Professors | |