O and G company

O2E Brands

Oak Bay HR Inc.

Oak Valley Health

Oak View Group

Oakbridge Search Partners

Oatey Co.

OBJECTIV Fitness

OBM CONSULTANCY

Obsidian

Obsidian Group Inc.

Obsidian Systems

OCAL Financial

Occupop

Ocean / Océan

Ocean Spray, Manseau (Qc)

OceanaGold

OceanFront Wealth Inc.

OceanMD

OceanMD, a WELL Health Company

Ochapowace Nation

OCL Group

OCL Group Inc.

Ocl-Group-Inc.

OCS Ontario Cannabis Store

Octave

Octave microbrasserie

Octopus Zoom

OculoVision

ODAIA

Odaia Intelligence Inc.

Odgers Berndtson

Odgers Canada

Odlum Brown Limited

Odlum-Brown-1

Odyscène

Odyssey Global

Odyssey Trust Company

OEC Group (Canada)

OEG Inc.

Office municipal d'habitation de Lévis

Office Municipal d'Habitation de Saguenay

Office of the Auditor General of Ontario

Offworld Industries

OG7GES Indigenous Group Inc.

Oggi Trattoria

OHC English

Oho Group

Oil and gas corporation

OK Tire 17 Ave SW Calgary

OK Tire Canada

Okanagan Thompson Legal Clinic

Okta

Okta for Developers

Okta, Inc.

Old Navy

Old Navy Canada Inc.

Old Salt Millwork

Oldcastle Infrastructure

OLG

Olin Canada ULC

Olive Asset Management

Olive Consulting LTD

Oliver Wyman

Olivercarol

Olivine, Inc.

OLOÏD INC.

Olsen

Olsen Consulting

Olymel

Olymel S.E.C.

Olympia Tile+Stone Inc.

OLYMPIC CONTROLS

Oman Shell

Omaze

OMD

Omega AS

Omega Kaizen Consulting

Omega Project Solutions

OMERS

OMERS / Oxford Properties Group

OMERS Ventures

OmniaBio

Omnicom Media

Omnicom Media Montréal

Omnifab

Omnify - Home of LumiSheetTM

Omnirev

Omnissa

Omnissa, LLC

Omra Electric Corp

On Location

On Side Restoration Services Ltd.

On Time Human Resources

OnActuate

Oncoustics

OnDeck AI (YC S25)

One Core Media

One Day I Wondered

One Eighty Success

One Health Clubs

One10 LLC

one37

OneMedNet

OneMethod

OneSky Community Resources

Onest Insurance

OneVest

OneVest Technologies Inc.

ONEX

Onfleet

Onico Solutions

Onion Lake Cree Nation

ONIT Construction Inc.

Oniyx

Only Data Entry

Onni Group

Onni Group of Companies

Onni Property Management Services Ltd

Onside AI

Ontario Camps Association

Ontario College Application Service

Ontario College of Family Physicians

Ontario Dental Association (ODA)

Ontario English Catholic Teachers' Association

Ontario Federation of Indigenous Friends

Ontario Health

Ontario HIV Treatment Network

Ontario Medical Association

Ontario Medical Supply

Ontario Ministry of Transportation/ Ministère des Transports de l'Ontario

Ontario Northland

Ontario Pension Board

Ontario Power Generation

Ontario Power Generation Inc.

Ontario Public Service Leadership | Leadership dans la fonction publique de l'Ontario

Ontario Reign

Ontario Securities Commission

Ontario Society of Professional Engineers

Ontario Teachers'

Ontario Teachers' Pension Plan

Ontario Teachers' Pension Plan Board

Ontario Tech University

Ontario Transit Group

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

Ontario Water Works Association

OntarioMD

Onterris

Onus Talent

Onward

Onward Technologies Limited

Onware Inc.

OnX

OnX Enterprise Solutions

ONxpress

Onyx Gold Corp.

Onyx Law Group

Onyx RH & Recrutement inc.

Onyx-Fire Protection Services Inc.

OP

Op2 North America

OPA! of Greece

OPAL Corporate Connections

OPB (Ontario Pension Board)

Open Farm Inc.

Open Farm Pet

Open Parachute

Open Systems Technologies

Opendoor

OpenFair Inc.

OPENLANE

OpenLoop

OpenLoop Health

OpenLoop Health, Inc.

OpenMined

OpenPhone

OpenReplay

OpenSesame

Opensity Solutions

OpenTable

OpenText

OPNC OPENLANE Canada Inc

OpsLab Integrators

Opsun Systèmes inc.

Optalent

OpTalent | Canada | Recruitment

OpTalent | Recruitment

OPTEL

Optel Group

Optel Vision Inc.

Optima Aero inc

Optima Living

Optimaliving

Optimize Financial Group

Optimus SBR

Optiom Inc.

Option Subaru

Options Community Services

Options Consulting Solutions

Optix

Optro

OPTrust

Opus Art Supplies

Opus-Regulatory

OpusClip

Opusing LLC - Staffing Agency

Opzilla Solutions Inc.

Oracle

Orange Cyberdefense

Orangutech

Orano

Orano Canada

Orbital

Orca Communications

Orchestry

Orckestra Technologies Inc.

Ordre des agronomes du Québec

Ordre des Infirmières et Infirmiers du Québec - OIIQ

Ordre des pharmaciens du Québec

Ore Group

Orezone - Mine Casa Bérardi

Organika Health Products

Organimi

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

Organized Crime Agency of British Columbia

Orica

Orica Limited

Origami HR

Origence

Origin Accounting & Advisory LLP

Origin Legal

Original Garage Moto

Orion Digital

Orion Global Solutions

Orion Group

Orion Health group

Orion Innovation

ORION Ontario's Research and Education Network

Orion Steel Group

Orise

Orix Geoscience Inc.

Orizon Mobile

Orla Mining Ltd

Ornge

ORO Labs

Orthofab inc.

Orviande inc.

Osborne Financial Search

Osborne Recruitment - North America

OSC

OSCO Construction Group

Osela inc.

OSF Digital

OSF Digital, Inc.

Oshawa Power Group

OSI

OSI Digital

Osi Digital Inc

OSI GROUP - GROUPE SOI

OSI Maritime Systems

OSL

OSL Direct Services

OSL Retail Services

OSL Retail Services Inc.

Osler Tax Group

Osler, Hoskin & Harcourt LLP

Oslo Construction inc.

Osoyoos Indian Band Development

Osoyoos Indian Band Development Corp

OssKin

Osteo Tuina

Ostrada

Otis Spunkmeyer, LLC

Otodata_fr

Otsuka Canada Pharmaceutical Inc.

OTT Financial Group

Ottawa Riverkeeper | Sentinelle de la rivière des Outaouais

OTUS Nonprofit CFOs

OTUS RH

Ou2There Solutions

Our Media Inc.

Ouster

Out in Science, Technology, Engineering, and Mathematics

Outhire Inc

Outillage de la Capitale inc.

Outillage Industriel Québec

Outillages Avitec inc.

Outlined Careers

Outpost Recruitment

Outright Consulting

Outset Law

Outwitly

Outwitly Inc.

Overstory

OVHcloud

Ovrc

Owen Daniels

Owl.co

Owlet Baby Care

Owner.com

Ownr Search

Oxa

OXARO Inc.

OXD Consulting Ltd.

Oxebo inc.

Oxford County

Oxford International Education Group

Oxford Properties Group

OXIO

Oxy petroleum company Canada

OxyChem

Oxygen8

OÏKOS Construction