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- Ornua Co-operative Limited 4
- Orona UK 1
- Orpheus 3
- ORR 2
- ORS 5
- Ortho Clinical Diagnostics 2
- Ortus PSR 4
- Ortus PSR Ltd. 2
- Orveon Global 4
- Orveon Global Ltd UK 10
- Orveon group 2
- Osbern Manor-Housekeeping 1
- Osbern Manor-Lifestyles 1
- Osborn Executive Recruitment Ltd 2
- Osborne Richardson 7
- OSCA Technology Ltd 1
- Oscar Associates (UK) Limited 4
- Oscar Technology 4
- Oscar Wood 4
- OSHAssociation 4
- OSI Systems, Inc. 1
- OSL Consulting 1
- Osmani Trust 2
- Osprey Europe Limited 1
- OSTTRA Group 2
- O'Sullivans Pharmacy Group 1
- Otavation 1
- Otis Elevator Co. 2
- Otonomee 1
- Ottawa Riverkeeper | Sentinelle de la rivière des Outaouais 2
- Otto James Consulting 4
- Otto James Consulting Limited 3
- Our Future Health 3
- Our Future Health Limited 1
- Ourbob 3
- Ouryclark 2
- Out in Science, Technology, Engineering, and Mathematics 1
- Outcomes First Group 40
- OutForm Consulting 1
- Outpost Technologies 1
- Outscape 2
- Outsmart Insight Ltd 3
- Outsource 4
- Outsource UK 2
- Outsource Uk Ltd 5
- OutSystems 2
- OutSystems Inc. 2
- Outward 1
- Outwood 2
- Overwolf, Ltd. 1
- Ovia Group 1
- Ovo Energy 1
- OVO Group 2
- Owen Daniels 9
- Owen Daniels 1
- Owen Daniels 15
- Owkin 1
- Oxalis Logistics UK Limited 1
- Oxby Recruitment Ltd 1
- Oxford Dynamics 4