- Osteology Foundation
- Osteopathie-Ecke Winterthur
- Osterwalder AG
- Ostschweizerische Treuhand Zürich AG
- Oswald Nahrungsmittel GmbH
- Otis
- Otis SA
- Otis Switzerland
- Otto Christ AG
- Otto Fischer AG
- Otto Hofstetter AG
- Otto Lang AG
- Otto Mathys Büroshop GmbH
- OTTO'S AG
- OTTOS Sport Outlets
- Ouchycrep SA
- Outdoor Media AG
- Outdoorchef AG
- outsec ag
- OVAG International AG
- OVD Kinegram AG
- OVD KINEGRAM AG
- OVESCOM AG
- Oviva
- Oviva AG
- Ovivo Switzerland AG
- OViX Tech Sàrl
- OWG Management AG
- Oxford Global Resources, Inc.
- Oxyphen GmbH, Filtration Group
- OYM AG
- P-CONNECT - Executive Search
- P-Connect GmbH
- P-STAR Löwenstrasse AG
- P. Lenzlinger SA
- P. Schweizer AG
- P. Sonderegger AG
- p.i.n.k.elefant gmbh
- P&I Personal & Informatik AG
- P&S Pumpenservice AG
- p3b ag
- p4b ag
- p4p consulting GmbH
- p4p Consulting GmbH
- PAC(O) - Projets Artistiques Collaboratifs (et Orientations)
- Packimpex
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