These are corporate groups and holding companies in Ontario. The list includes large enterprises like Barrick Mining Corporation, which focuses on gold and copper assets, and Cineplex, an entertainment company operating in film exhibition and other venues. Also present are Extendicare, a provider of senior care services, and Aviva Canada, an insurance provider. This selection primarily features established companies with significant employee bases.
A notable pattern among these companies is their diverse industry representation, ranging from manufacturing and financial services to entertainment and healthcare. While many are headquartered in Toronto, other cities like Markham, Vaughan, and Oakville also host major corporate offices, indicating a spread of corporate activity across Ontario.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Barrick Mining Corporationbarrick.com
A company focused on owning high-quality gold and copper assets, managed by top talent to provide strong returns and benefits to stakeholders |
15,486 | |||
| 2 |
Cineplexcineplex.com
A Canadian entertainment company operating in film exhibitor, digital commerce, food service, media, and entertainment venues, including The Rec Room and Playdium |
6,073 | |||
| 3 |
Extendicareextendicare.com
A leading provider of senior care services in Canada, offering skilled nursing care, home health care, retirement living, and management services with a focus on quality, compassion, and excellence |
5,980 | |||
| 4 |
Aviva Canadaaviva.ca
Leading provider of home, automobile, lifestyle, and business insurance serving 2.5 million customers across Canada with strong financial backing. |
5,075 | |||
| 5 |
Definitydefinityfinancial.com
Parent company of several established Canadian property and casualty insurance brands focused on improving insurance for customers and communities. |
4,398 | |||
| 6 |
Recipe Unlimited Corporationrecipeunlimited.com
Leader in Canada's full-service restaurant industry since 1883, franchising and operating iconic brands nationwide, with a focus on quality dining experiences |
4,240 | |||
| 7 |
Perseus Group, Constellation Softwarecsiperseus.com
The company focuses on nurturing and growing businesses through data-driven guidance, permanent capital, and empowering general managers for maximum potential |
3,916 | |||
| 8 |
CSA Testing & Certificationcsagroup.org
Development of safety and technical standards combined with global testing, inspection, and certification services for diverse industries. |
3,522 | |||
| 9 |
Samuel, Son & Co.samuel.com
Family-owned integrated network providing metal manufacturing, processing, distribution, and value-added industrial products and services across North America. |
3,036 | |||
| 10 |
goeasy Ltd.goeasy.com
A Canadian financial services company providing non-prime leasing, lending, and credit access to millions of Canadians while prioritizing employee culture and community initiatives |
3,024 | |||
| 11 |
Harris Computerharriscomputer.com
Provides mission-critical software solutions for public sector, healthcare, utilities, and private sectors across North America, Europe, Asia, Australia. |
2,929 | |||
| 12 |
Multimaticmultimatic.com
A global enterprise specializing in supplying automotive components, systems, and engineering services with manufacturing divisions and engineering facilities worldwide |
2,598 | |||
| 13 | 2,564 | ||||
| 14 |
Longo'slongos.com
Specializing in providing the best food experience in the Canadian grocery industry, with a focus on trustworthiness, honesty, and community involvement |
2,286 | |||
| 15 |
Pizza Pizza Limitedpizzapizza.ca
Canadian pizza pioneer with over 750 locations, offering quality food, diverse menus, and exciting promotions with a focus on innovation and community involvement |
2,267 | |||
| 16 |
Flynn Group of Companiesflynncompanies.com
Leading North American building envelope contractor offering roofing, glazing, metals, waterproofing services Seeking to merge with like-minded companies for growth opportunities |
2,229 | |||
| 17 |
Momentum Financial Services Groupmfsg.com
Provides short-term loans, money transfers, prepaid cards, and technology solutions to underserved communities for accessible financial services. |
2,045 | |||
| 18 |
Sofina Foods Canadasofinafoods.com
Leading manufacturer and supplier of pork, beef, fish, turkey, and chicken products for retail and foodservice markets globally. |
1,977 | |||
| 19 |
Northbridge Financial Corporationcareers.nbfc.com
A leading Canadian commercial property and casualty insurance group offering innovative solutions to protect businesses and support communities nationwide for 100 years |
1,956 | |||
| 20 |
Canada Cartagecanadacartage.com
Providing customer-located, dedicated trucking and warehouse services with fleets and drivers residing at client locations across Canada. |
1,846 | |||
| 21 |
Questrade Financial Groupquestrade.com
A Canadian financial services company offering low-cost digital alternatives, investment opportunities, online wealth management, and a forward-thinking workplace culture |
1,805 | |||
| 22 |
Foresters Financialforesters.com
It redefines life insurance and savings with digitized processes, member benefits, and tailored plans for improved financial security and wellness. |
1,658 | |||
| 23 |
Sonepar Canadasoneparcanada.com
A leading distributor of electrical products with a strong presence in Canada, represented by multiple brands and over 1800 employees |
1,634 | |||
| 24 |
Oxford Properties Groupoxfordproperties.com
Global real estate investor, developer, and manager across various property types including office, life science, industrial, retail, living, and hotels. |
1,627 | |||
| 25 |
Ross Videorossvideo.com
Designs and manufactures innovative live production equipment used globally by broadcasters, sports venues, government, and production companies. |
1,614 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
MBI Brandsmbibrands.com
A leading Canadian franchisor operating premium QSR brands, with nearly 300 restaurants and plans for further expansion |
1,396 | |||
| 27 |
Economical Insuranceeconomical.com
Provides insurance solutions for homes, vehicles, farms, and commercial operations with a focus on customer care and innovation. |
1,391 | |||
| 28 |
KAR GROUP LLCkar-group.com
A diversified group of market leading businesses in construction, engineering, property, trading, performance cars, travel, leisure, and equestrian industries |
1,213 | |||
| 29 |
Drake Internationaldrakeintl.com
A global leader in flexible and permanent staffing, offering talent management solutions to maximize human capital assets and increase organizational bottom line |
1,189 | |||
| 30 |
Morguardmorguard.com
Fully integrated real estate business owning, managing, and investing in diverse assets across North America, including REITs and providing advisory services |
1,123 | |||
| 31 |
Volaris Groupvolarisgroup.com
Acquires and grows vertical market technology companies through best practice sharing, organic initiatives, and long-term sustainable development. |
1,102 | |||
| 32 |
Sunwingsunwing.ca
A group of leading vacation brands in North America offering leisure tours, travel retail services, and destination wedding planning |
1,077 | |||
| 33 |
Atlantic Packaging Products Ltd.atlantic.ca
Design manufacture and deliver innovative corrugated packaging products with integrated solutions including pre-print, retail displays, supply chain, and recycled materials across Canada and US. |
1,048 | |||
| 34 |
Votorantim Cimentos North America (VCNA)votorantimcimentos.com
Leading provider of cement, concrete and aggregates in North America, part of a global building materials and sustainability solutions provider |
1,044 | |||
| 35 |
Connor, Clark & Lunn Financial Group (CC&L)cclfg.cclgroup.com
Multi-boutique asset management firm offering a diverse range of investment solutions for institutions, individuals, and financial advisors in Canada |
963 | |||
| 36 |
Dye & Durham Corporationdyedurham.com
Provider of practice management solutions for legal professionals, data insights for corporate transactions, and payments infrastructure for government and financial institutions across multiple countries |
945 | |||
| 37 |
Cementation Americascementation.com
Global mining services provider focused on underground mine contracting, engineering, and material handling solutions, committed to safety, value, and client satisfaction |
933 | |||
| 38 | 903 | ||||
| 39 |
Russel Metalsrusselmetals.com
A leading metal distributor in North America with a focus on value-added processing, serving various industries with a wide range of metal products |
850 | |||
| 40 |
Marsh Canadacorporate.marsh.com
Global leader in insurance brokering and risk advisory services, providing data-driven solutions to commercial and individual clients worldwide through multiple market-leading businesses |
839 | |||
| 41 |
CCL Industries
Manufacturing labels, specialty media, digital printing software, aluminum aerosol cans, plastic tubes, instructional leaflets, and precision metal components for various markets. |
835 | |||
| 42 |
Giampaolo Group Inc.
Fully integrated metal management company with operations in metal recycling, steel processing, aluminum production, real estate development, and charitable fundraising events for various causes |
829 | |||
| 43 |
Glencore Zincglencore.com
Global commodity business with autonomous operations in mining and production of zinc, with interests in copper-zinc mining projects worldwide for growth |
812 | |||
| 44 |
Tucowstucows.com
The company focuses on keeping people connected and the internet open through domain services, fiber internet, and telecom software solutions |
793 | |||
| 45 |
The Miller Groupmillergroup.ca
A leading road construction company in Canada with a long history of excellence, investing in employees, embracing diversity, and offering rewarding careers |
727 | |||
| 46 |
CAA South Central Ontariocaasco.com
Provider of roadside assistance, automotive, insurance, travel, and rewards services, focused on delivering peace of mind and quality service to members |
705 | |||
| 47 |
Northland Power Inc.northlandpower.com
An independent power producer focused on sustainable infrastructure assets, including natural gas, solar, and wind energy projects for long-term value and environmental impact |
692 | |||
| 48 |
Enstar Groupenstargroup.com
Global insurance group specializing in run-off risk management, claims handling, and strategic investments to optimize capital and legacy solutions. |
689 | |||
| 49 |
Sleeman Breweries Ltd.sleemanbreweries.ca
A Canadian brewery with a rich family legacy, producing top craft beers under stringent standards, offering a variety of world-class brands |
685 | |||
| 50 |
Miller Waste Systems Inc.millerwaste.ca
A Canadian waste management leader offering collection, recycling, composting, and hazardous waste solutions while also producing renewable energy and fertilizer |
683 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
More company lists in Ontario
- The largest companies in Ontario 5,032
- Multinational companies in Ontario 901
- Financial services firms in Ontario 396
- Manufacturers in Ontario 389
- Critical infrastructure operators in Ontario 344
- Retail chains in Ontario 327
- Companies with in-house R&D in Ontario 300
- Logistics companies in Ontario 285
- Education providers in Ontario 276
- SaaS companies in Ontario 275
- Truck Transportation companies in Ontario 270
- Transportation, Logistics, Supply Chain and Storage companies in Ontario 261
- Public sector organisations in Ontario 259
- Financial Services companies in Ontario 250
- IT Services and IT Consulting companies in Ontario 235
- Software Development companies in Ontario 231
- Healthcare providers in Ontario 226
- Hardware manufacturers in Ontario 213
- Professional services firms in Ontario 211
- Hospitals and Health Care companies in Ontario 205
- Distributors and wholesalers in Ontario 183
- Companies with a mobile app in Ontario 181
- Publicly traded companies in Ontario 156
- IT services companies in Ontario 156
The same list elsewhere in Canada
- Corporate groups and holding companies in Canada 318
- Corporate groups and holding companies in the province of Quebec 75
- Corporate groups and holding companies in Alberta 50
- Corporate groups and holding companies in British Columbia 33
- Corporate groups and holding companies in Toronto 48
- Corporate groups and holding companies in Montreal 39