| Apple Singapore | Singapore |
| Applied Instruments Pte Ltd | Singapore |
| Applify Tech Pte Ltd | Singapore |
| Appreneurs.Co Pte Ltd | Singapore |
| Appsilan Asia Pte Ltd | Singapore |
| Appvantage | Singapore |
| Appxplore (iCandy) Ltd | Singapore |
| Aptsys | Singapore |
| Aramid.finance | |
| Arbor Ventures | Singapore |
| ARC Mobile | Singapore |
| Arcadier Pte Ltd | Singapore |
| Arcstone | Singapore |
| Argent Holdings Pte Ltd | Singapore |
| Argent Holdings Pte Ltd | Singapore |
| Argentra | Singapore |
| Armfoot Integrated Technology Pte Ltd | Singapore |
| ARPA | |
| ARQon | |
| Arrow | Singapore |
| Artnexus Design Pte Ltd | Singapore |
| Arttha | Singapore |
| Ascelade | Singapore |
| AShield Technologies | Singapore |
| Asia Pacific Bioinformatics Network | Singapore |
| Asia Systems Technologies Pte Ltd | Singapore |
| AsiaCloud Solutions Pte Ltd | Singapore |
| Asianet Pacific (S) Pte Ltd | Singapore |
| AsiaPac Distribution Pte Ltd | Singapore |
| AsiaPac Technology Pte Ltd | Singapore |
| Asiapay Payment Technology Pte Ltd | Singapore |
| ASJ Holdings Ltd | Singapore |
| Askvisor, LLP | Singapore |
| ASLAN Pharmaceuticals | Singapore |
| ASMPT | Singapore |
| Aspire Designs | Singapore |
| Aspire FT Pte Ltd | Singapore |
| Asprit Solutions | Singapore |
| Association for Medical and Bio-Informatics, Singapore | Singapore |
| Association of Electronic Industries in Singapore | Singapore |
| Association of Information Security Professionals | Singapore |
| Association of Telecommunications Industry of Singapore | Singapore |
| Assure IT Pte Ltd | Singapore |
| Asterisk Computer (FE) Pte Ltd | Singapore |
| Astronaut Capital | Singapore |
| Atato | Singapore |
| Athena Dynamics Pte Ltd | Singapore |
| Atlan Pte Ltd | Singapore |
| Atlas Data Network | Singapore |
| Atomionics Pte Ltd | |