- Omnicom SA
- Omnisens SA
- Omnitax AG Wirtschafts- und Steuerrecht
- Omya (Schweiz) AG
- Omya AG
- Omya International AG
- Omya Management AG
- Onassis Foundation
- ONAX AG - it solutions
- Ondemand Agility Solutions AG
- ONE Agency
- ONE Asset Management AG
- One Crans-Montana SA
- One Inside Switzerland AG
- One Placement AG
- One Placement SA - Genève
- One Placement SA - Lausanne
- Oneconsult AG
- Onedot
- Onedot
- OneLine GmbH
- oneresource AG
- ONG Conseil Suisse
- Oniverse
- OnlineDoctor AG
- OnO Centre chirurgical de l'oeil SA
- onsemi
- Onyx Circle AG
- Opacc Software AG
- Opale Solutions AG
- Open Circle AG
- Open Mineral AG
- Open Systems AG
- Open Web Technology
- Opernhaus Zürich AG
- OPES AG
- OPHARDT Hygiene AG
- OPHTA SERVICES SUISSE
- Ophtapharm AG
- OPO Oeschger AG
- oprandi & partner
- oprandi & partner ag, aarau
- oprandi & partner ag, bern
- oprandi & partner ag, zürich
- OPTEN AG
- Optics Balzers AG
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