| Arktis Radiation Detectors Ltd | |
| ArluText | Bern |
| Armanisoft | Lucerne |
| ARP Schweiz AG | Zug |
| Arqh AG | |
| Art & Media GmbH | Zurich |
| Artamedia.net | Valais |
| artd webdesign GmbH | Bern |
| Articulated Advantage | |
| Artidis AG | |
| Artiria Medical | |
| Artiria Medical S.A. | |
| Artmotion AG | Zug |
| Artwin AG | Aargau |
| Arviem AG | |
| Ascaion | Zurich |
| Asceneuron S.A. | |
| Ascensia Diabetes Care Holdings AG | |
| Ascentiv AG | Zurich |
| Ascento AG | |
| Ascento Robotics | Zurich |
| Ascom Holding AG | Bern |
| AsedSciences AG | |
| Asetronics AG | Bern |
| ASI Advanced Sport Instruments | |
| Asic Robotics AG | Bern |
| Asmallworld AG | |
| Asomatic AG | Lucerne |
| Aspaara | Zurich |
| Aspectra AG | Zurich |
| Aspivix S.A. | |
| Assiomatica AG | Zurich |
| Assist-o S.A. | |
| Astarios GmbH | |
| Astrocast S.A. | Vaud |
| AtelArt Informatique | Valais |
| Atelier Design of Mars | Geneva |
| Ateliers de la Ville de Renens | |
| Aterios GmbH | Zug |
| atHeart Medical | |
| Athebio | |
| Atlantic Ventures GmbH | Zurich |
| Atopia Therapeutics | |
| Atpar AG | |
| Atrinum Ventures AG | |
| Attolight AG | |
| Aukera Therapeutics GmbH | |
| Aurachain | |
| Aurealis Therapeutics | |
| Aurora's Grid | |