| Advanced Robotics And Intelligent Systems | Academic & Science |
| Academic Register Information System | Academic & Science |
| ArisFOX Language Art Professionals | Academic & Science |
| Advanced Research Instrumentation Ship | Academic & Science |
| Advancing Research Impact in Society | Academic & Science |
| Advanced Research Investment Solutions | Academic & Science |
| A R I Network Service, Inc. | Business |
| Ambulance Response Information System | Community |
| Aids Resources Information And Services | Community |
| Advance Roll Information System | Community |
| American Religious Identification Survey | Community |
| Aggregate Route Ip Switching | Computing |
| Architecture for Integrated Information System | Computing |
| Agriculture Research Information System | General |
| Assessment Report Indexing System | General |
| A Really Inspiring Space | General |
| Advanced Reagent Injector System | General |
| Annual Report Information Survey | General |
| Achievement Reporting and Innovation System | General |
| Accountable Responsible Inform Sign | General |
| Augmented Reality Interactive Storytelling | General |
| Adaptive Resolution Imaging Sonar | General |
| Anti-Racism Information Service | General |
| Advanced Range Instrumentation Ship | General |
| Activity Reporting Information System | General |
| Advanced Rider Index System | General |
| Arrow Renesas IoT Synergy | General |
| Augmented Reality for Interactive Storytelling | General |
| Advanced Reactor Information System | General |
| Aerosol Rapid Introduction System | General |
| A Really Intelligent System | General |
| Anonymous Reporting and Information System | General |
| Attack Registry And Intelligence Service | Governmental |
| Adjustable And Reasonably Intellient Searcher | Internet |
| Adverse Reaction Information System | Medical |
| Architecture of Integrated Information Systems | Softwares |
| Augmented Reality Image Synthesis | Softwares |
| Active Rack Isolation System | Space Science |
