| Anoma | |
| Anou2 | Vaud |
| Ansorix | Bern |
| ANT-Informatik AG | |
| Antares Kommunikationstechnik AG | Zurich |
| Antavis AG | Aargau |
| Antion Biosciences S.A. | |
| ANYbotics | |
| AnyWeb AG | Zurich |
| APCO Technologies | |
| Apertis Consulting | Basel-Landschaft |
| Aperture S.A. | |
| Aphaia Pharma AG | |
| Apheros | |
| Apiax AG | Zurich |
| ApiMedic | |
| Apload GmbH | Solothurn |
| AppBrain | Zurich |
| Appenzeller Webdesign GmbH | Zurich |
| Appik Studio S.A.R.L. | |
| Apple Glattzentrum | Zurich |
| Apple Rue de Rive | Geneva |
| Applic8 S.A. | Vaud |
| Apps with love AG | |
| Appway AG | Zurich |
| Apsis GmbH | Zurich |
| Aptasic S.A. | |
| aQ Engineering GmbH | St. Gallen |
| Aquarius Water Group | |
| Aquila AG | |
| Aragon | |
| Araris Biotech AG | |
| Aravis S.A. | Zurich |
| Arcade Solutions AG | Lucerne |
| Arcantel S.A. | Neuchâtel |
| Archilogic AG | |
| Archimede Solutions S.A.R.L. | |
| Archlet AG | |
| Arcium | |
| Arcmedia AG | Lucerne |
| Arcoris Bio AG | |
| Arcoscreen S.A. | |
| Arena Ventures AG | |
| ARF Financial GmbH | |
| Argá Medtech S.A. | |
| Argus Data Insights Schweiz AG | |
| Argus Space AG | |
| ArgYou AG | Zug |
| Ariacom | Geneva |
| Ark Linux | Zurich |