O'brien Contracting Canada Limited
O'Canada Gear
O'Chiese Sand, Gravel and Contracting Ltd.
O'Connor Associates Environmental Inc.
O'doig Consulting Services Inc.
O'donnell International Trucks Ltd.
O'hara Protection Corp.
O'mahoney Family Foundation
O'Sullivan Systems Consulting Ltd.
O'Wolfe Holdings Ltd.
O.d.t. Sports Enterprises Corp.
O.E.M. Remanufacturing Company Inc.
O.i. Johnson Construction Ltd
O.r.i. Energy Inc.
O.s.e.f. France-Canada Inc.
O.u.r. Success Corporation
O2 Planning + Design Inc.
O7 Networks Inc.
Oak Environmental Inc.
OAKLEAVES FRAMING and CONSTRUCTION INC.