| Above-i GmbH | Zug |
| abuse.ch AG | |
| AC BioScience S.A. | |
| AC BioScience S.A. | |
| AC Immune S.A. | |
| Academic Work | Geneva |
| Académies suisses des sciences | Bern |
| Acado Bau + Design AG | Zurich |
| ACAR GmbH | Zurich |
| Accelsiors | |
| Accointing AG | |
| Accuswiss GmbH | Basel-Landschaft |
| Acino International AG | |
| Acodis AG | |
| Acqua Telecom | |
| ACR Brändli + Vögeli AG | Aargau |
| Acredius | |
| ACROBiosystems | |
| Acronis International GmbH | Schaffhausen |
| Act Light S.A. | Vaud |
| Actando | |
| Actant AG | Zug |
| Acthera Therapeutics Ltd | |
| Active Sourcing GmbH | Schwyz |
| Actricity AG | Basel-Landschaft |
| Adabit | Zurich |
| Adaptyv Biosystems, Inc. | |
| ADB S.A. | Geneva |
| ADC Advanced Datacommunication Consulting AG | Zurich |
| ADC Therapeutics S.A. | |
| Adcubum AG | St. Gallen |
| ADD NAEF IT-Services | Zurich |
| Addex Therapeutics | |
| Additiv AG | |
| Adecco | |
| AdeccoGroup | |
| Adfinis SyGroup AG | Basel-Stadt |
| AdHash | Zug |
| AdHash | |
| ADIENNE Pharma & Biotech S.A. | |
| adiheutschi.ch | Bern |
| Adiposs | |
| ADIVAN High Tech AG | Schwyz |
| ADS Electronic Dillinger | Zurich |
| Advance Metrics AG | |
| Advanced Bionics AG | |
| Advanced Power AG | |
| Advanced Power AG | |
| Advanced Silicon S.A. | Vaud |
| Advanced Solutions Consulting GmbH | Aargau |