Oak Bay HR Inc.

Oak Valley Health

Oakbridge Search Partners

OBJECTIV Fitness

Obsidian

Obsidian Group Inc.

Ocean Spray, Manseau (Qc)

OceanFront Wealth Inc.

Ochapowace Nation

Octave microbrasserie

ODAIA

Odd Cookie Snacks

Odgers Canada

Odyscène

OEC Group (Canada)

Office d'habitation de Longueuil

Office municipal d'habitation de Lévis

Office Municipal d'Habitation de Saguenay

Oggi Trattoria

OHC English

OK Tire 17 Ave SW Calgary

OK Tire Canada

Olathe Health

Old Dutch

Old Salt Millwork

Olive Asset Management

Olive Consulting LTD

Olymel

Olymel S.E.C.

OMD

OMEGA, Inc.

OMERS

OMERS / Oxford Properties Group

OmniaBio

Omnicom Media

Omnifab

On Location

OnActuate

One Day I Wondered

One Dental Corp.

One Health Clubs

One Performance Institute

Onest Insurance

Ongles Jenny Spa (9444 9394 Québec inc.)

Onion Lake Cree Nation

ONIT Construction Inc.

Onside AI

Onslow County Public Schools

Ontario Association of Cemetery and Funeral Professionals (OACFP)

Ontario Camps Association

Ontario English Catholic Teachers' Association

Ontario HIV Treatment Network

Ontario Lottery and Gaming Corporation

Ontario Power Generation

Ontario Securities Commission

Ontario Shores Centre for Mental Health Sciences

Ontario Teachers’ Pension Plan

Ontario Transit Group - Ontario Line - Southern Civil, Stations & Tunnel

Ontario Trillium Foundation

Ontario University Athletics

Ontario Water Works Association

Ontario-Health-Athome

OntarioMD

Onterris

Onthebus

OnX

ONxpress

Onyx Law Group

Onyx RH & Recrutement inc.

Onyx Stones & Custom Cabinets Ltd.

Onyx-Fire Protection Services Inc.

Op2 North America

OPA! of Greece

Open Parachute

Open Systems Technologies

Opendoor

OPENLANE

OpenRoad Auto Group Limited

Opensity Solutions

OpenText

Opsun Systèmes inc.

Optalent

Opti9 Technologies

Optimaliving

Optimize Financial Group

Option Subaru

Options Consulting Solutions

Opusing LLC - Staffing Agency

Orange Cyberdefense

Orano Canada

Ordre des Infirmières et Infirmiers du Québec - OIIQ

Ordre des pharmaciens du Québec

Ore Group

Orezone - Mine Casa Bérardi

Organisme d’autoréglementation du courtage immobilier du Québec (OACIQ)

Organon Canada

Orica

Original Garage Moto

Orion Digital Corp.

Orion Innovation

ORION Ontario's Research and Education Network

Orise

Orix Geoscience Inc.

Orizon Mobile

Orla Mining

Orla Mining Ltd

ORO Labs

Ortho Lévis

Orthofab inc.

Orviande inc.

OSC

OSCO Construction Group

Osela inc.

OSI

Osi Digital Inc

OSI GROUP - GROUPE SOI

Osiris Inc.

OSL Retail Services

OSL Retail Services Inc.

Osler

Osler Tax Group

Oslo Construction inc.

OssKin

Osteo Tuina

Ostrada

Otis Elevator Co.

Otsuka Canada Pharmaceutical Inc.

Ottawa Catholic School Board

Otter Farm & Home Co-operative

OTUS RH

Ou2There Solutions

Outillage de la Capitale inc.

Outillage Industriel Québec

Outright Consulting

Outset Law

Outwitly Inc.

Ovation Healthcare

OVHcloud

Oxebo inc.

Oxford County

Oxford Learning Centres, Inc.

OXIO

OÏKOS Construction