O'Brien TM Services Inc.
O'connor Health Services Ltd.
O'grady Human Resources & Management Consulting Inc.
O'nique Limited
O'Phaelan Consulting ltd.
O-Zone International Consultants for Sustainable Development Cor
O. & B. New Vision Ltd.
O. & D. Translation Services Ltd.
O. Canada Foods Inc.
O.m. Copp And Associates Ltd.
O.r.l. Options Realties Ltd.
O.R.R. Building Independence Inc.
O.t.t. Granite Inc.
Oaf Technologies Inc.
Oakbury Investments Corp.
Oakes Heating Inc.
Oakes Home Comfort Ltd.
Oakridge Janitorial Services Ltd.
Oara Design International Incorporated
Oasis Geomatics Inc.