| Altis Biosystems | North Carolina |
| ALTIS Computer Services, Inc. | Louisiana |
| Altispeed | North Dakota |
| Altitude 800 Corporation | California |
| Altius Broadband, Inc. | Kentucky |
| Altivia Solutions, LLC | Colorado |
| Altizon, Inc. | New Jersey |
| Altman Solon | Massachusetts |
| Alto | Texas |
| Alto Neuroscience | California |
| Alto Neuroscience | |
| Alto Palo | |
| Altogen Biosystems | Nevada |
| Altoida | District of Columbia |
| Altomec Endoscopy, Inc. | Michigan |
| Alton Bank | |
| Altonized Community Federal Credit Union | |
| Altoona First Savings Bank | |
| Altor Systems | California |
| Altoros | California |
| Altos | New Hampshire |
| Altova | Massachusetts |
| AltPep Corporation | Washington |
| ALTR Solutions, Inc. | |
| Altra Federal Credit Union | |
| Altris, Inc. | Illinois |
| AltrixBio | Massachusetts |
| Altro Systems, Inc. | California |
| Altron Automation | Michigan |
| Altronic Research, Inc. | Arkansas |
| Altronics Security | Pennsylvania |
| Altronix Corporation | New York |
| Altru Credit Union | |
| Altruist Corporation | California |
| Altsmark, LLC | |
| AltSource, Inc. | |
| ALTUCELL | New York |
| Altula | California |
| Altum, Inc. | Virginia |
| Altumind | |
| Altura Ventures | California |
| Alturas Analytics, Inc. | Idaho |
| Alturas Capital Partners | Idaho |
| Altus Internet | South Dakota |
| Altus Life Science | California |
| Altus Technologies Corporation | Ohio |
| Alty, Inc. | Delaware |
| Alucent Biomedical, Inc. | Utah |
| Aluda Pharmaceuticals, Inc. | California |
| Alula | Minnesota |