| Academic Credentials Assessment Service | Academic & Science |
| American Chinese Art Society | Academic & Science |
| Automated Collection Analysis Service | Business |
| Associate of Casualty Actuatial Society | Business |
| Advisory Counselling and Arbitration Service | Business |
| American Capital Strategies, LTD. | Business |
| Advisory, Conciliation and Arbitration Service | Business |
| Advisory Conciliation Arbitration Service | Business |
| Aboriginal Children's Advancement Society | Community |
| Arizonans Concerned About Smoking | Community |
| Association of Concerned Africa Scholars | Community |
| Asian Community AIDS Service | Community |
| Association of Comic Artists Singapore | Community |
| Asian Community Aids Services | Community |
| Application Control Architecture Services | Computing |
| Applewood Computers Accounting System | Computing |
| American College of Applied Science | Educational Institute |
| Automotive Collision Avoidance Systems | General |
| Associacao de Carro Antigo de Sorocaba | General |
| Assured Compliance Assessment Solution | General |
| Affiliate Conformity Assessment Status | General |
| Automotive Collision Avoidance System | Governmental |
| Airborne Collision Avoidance System | Governmental |
| Associate of The Casualty Actuarial Society | Jobs |
| Adaptive Cluster Analysis System | Medical |
| Asymptomatic Carotid Atherosclerosis Study | Medical |
| Adherent Cell Analysis and Sorting | Medical |
| Army Commissary Automated System | Military and Defence |
| Army Crisis Action System | Military and Defence |
| Aged Care Assessment Services | Regional |
| Adaptive Context Aware Services | Softwares |
