- OECon Suisse SA in Liquidation
- Sonnenbergstrasse 53
- Hergiswil NW
- NW
- Oert AG in Liquidation
- Hergiswil (NW)
- NW
- Oeko-B AG
- Fronhofenstrasse 10
- Stans
- NW
- OecoPlus AG
- Ennetbürgerstrasse 36
- Buochs
- NW
- OENI GmbH
- Allmendstrasse 10
- Buochs
- NW
- Oettli & Weibel AG
- Pilatusstrasse 22
- Hergiswil
- NW