| Association for the Advancement of Artificial Intelligence | California |
| Association for the Advancement of Computing in Education | Virginia |
| Association for Unmanned Vehicle Systems International | Virginia |
| Association for Women in Science | Virginia |
| Association of America-Israel Chambers of Commerce | |
| Association of Americal Medical College | |
| Association of American Universities | District of Columbia |
| Association of Biomolecular Resource Facilities | Maryland |
| Association of Commercial Space Professionals | |
| Association of Computer Repair Business Ownsers | Virginia |
| Association of Computer Technology Educators of Maine | Maine |
| Association of Florida Colleges | |
| Association of Independent Technological Universities | California |
| Association of Internet Researchers | Colorado |
| Association of Mathematics Teacher Educators | North Carolina |
| Association of Medical Directors of Information Systems | California |
| Association of Science Technology Centers | District of Columbia |
| Association of Teachers of Mathematics of New York City | New York |
| Association of Technology, Management and Applied Engineering | North Carolina |
| Association of University Presses | |
| Association of University Research Parks | Arizona |
| Association of University Technology Managers | District of Columbia |
| AssociationVoice | Colorado |
| Assort Health | |
| Assorted Internet | Florida |
| Assumption University Computer Science | Massachusetts |
| Assumption University Cybersecurity | Massachusetts |
| Assumption University Mathematics | Massachusetts |
| Assurance Technology Corporation | Massachusetts |
| Assure Studios | |
| Assured Information Security, Inc. | |
| Assured Space Access, Inc. | Arizona |
| Assured Wireless | California |
| AssureSign, LLC | Georgia |
| Assurety Consulting, Inc. | Virginia |
| AssurX, Inc. | California |
| Assyst | Virginia |
| Assystant | |
| AST | California |
| AST & Science, LLC | Texas |
| AST Group | Arizona |
| AST, Inc. | Michigan |
| Asta Ltd | |
| Astadia, Inc. | Massachusetts |
| Astak | California |
| Astaqc | Oregon |
| Astarna, Inc. | Montana |
| Astek Corporation | Colorado |
| Astek Diagnostics | Maryland |
| ASTER Labs, Inc. | Minnesota |