O-M6 Technologies inc.

Oak Bay HR Inc.

Oakbridge Search Partners

OBJECTIV Fitness

Observatoire-Qu

Obsidian Group Inc.

Ocean Spray, Manseau (Qc)

OceanFront Wealth Inc.

Ochapowace Nation

Octave microbrasserie

ODAIA

Odgers Canada

ODL, Inc

Odyscène

OEC Group (Canada)

Office municipal d'habitation de Lévis

Office Municipal d'Habitation de Saguenay

Officevibe

Oggi Trattoria

OHC English

OK Tire 17 Ave SW Calgary

OK Tire Canada

Okta

Old Salt Millwork

Olin Canada ULC

Olive Asset Management

Olive Consulting LTD

Olymel

Olymel S.E.C.

OMD

OMERS

OmniaBio

Omnicom Media

Omnifab

On Location

OnActuate

Oncoustics

One Day I Wondered

One Health Clubs

Onest Insurance

ONEtoONE Corporate Finance

Onion Lake Cree Nation

ONIT Construction Inc.

Onni Group of Companies

Onside AI

Ontario Bar Association

Ontario English Catholic Teachers' Association

Ontario Health | Santé Ontario

Ontario Power Generation Inc.

Ontario Real Estate Association

Ontario Shores Centre for MHS

Ontario Society of Professional Engineers

Ontario Trillium Foundation

Ontario University Athletics

Ontario-Centre-of-Innovatio

Onterris

OnX

ONxpress

Onyx Law Group

Onyx RH & Recrutement inc.

Onyx-Fire Protection Services Inc.

Op2 North America

OPA! of Greece

Opal-rt

Open Parachute

Open Systems Technologies

Opendoor

Opensity Solutions

OpenText

Oppurtuna

Optalent

Optimize Financial Group

Optimyze1

Option Subaru

Options Consulting Solutions

Opusing LLC - Staffing Agency

Orange Cyberdefense

Orano Canada

Orbital

Orbital Witness

Ordre des pharmaciens du Québec

Ordre des Technologues Professionnels du Québec (OTPQ)

Ore Group

Orezone - Mine Casa Bérardi

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

Orica

Original Garage Moto

Orion Innovation

ORION Ontario's Research and Education Network

Orise

Orix Geoscience Inc.

Orizon Mobile

Ornge

ORO Labs

Orviande inc.

Orä Partenaires

OSCO Construction Group

Osela inc.

OSI

OSI GROUP - GROUPE SOI

OSI Maritime Systems

OSL Direct Services

Osler, Hoskin & Harcourt LLP

Oslo Construction inc.

OssKin

Osteo Tuina

Ostrada

OT DEVELOPMENTS

Otip Group Of Companies (Ogc)

Otsuka Canada Pharmaceutical Inc.

Ottawa Riverkeeper

OTUS RH

Ou2There Solutions

Outillage de la Capitale inc.

Outillage Industriel Québec

Outillages Avitec inc.

Outright Consulting

Outset Law

Outwitly Inc.

OVHcloud

Own The Podium

OXD

Oxebo inc.

Oxford Properties Group

OÏKOS Construction