| Academy of Applied Myofunctional Sciences | Academic & Science |
| Advances and Applications in Mathematical Sciences | Academic & Science |
| American Air Mail Society | Academic & Science |
| Automated Accounts Management Services | Accounts and Finance |
| Accredited Asset Management Specialist (us) | Accounts and Finance |
| Accurate Appraisal Management Services | Business |
| AMSARTS Arbitration and Mediation Services | Business |
| ABN AMRO Merchant Services | Business |
| Assessment and Accreditation Management System | Business Management |
| Assessment Accreditation Management System | Business Management |
| Advanced Association Management Services | Business Management |
| Agency Asset Management System | Business Management |
| Asian American Music Society | Community |
| Auto Audio Mastering System | Community |
| Academy of Alameda Middle School | Community |
| Association of Air Medical Services | Community |
| American Accordion Musicological Society | Community |
| Advanced Agricultural Measurement Systems | General |
| Anytime Anywhere Messaging Service | General |
| Active Air Management System | General |
| Automotive Apprenticeship Matching Service | General |
| Automated Acquisition Management System | Governmental |
| Air Automated Manifest System | Governmental |
| Accredited Asset Management Specialist | Jobs |
| Association of Air Medical Services (US) | Medical |
| Air-to-air Missile System | Military and Defence |
| Airport Airside Management System | Military and Defence |
