| # | Company | Employees |
|---|---|---|
| 1 |
TDcareers.td.com
A leading North American bank with a global presence, serving 22 million customers with a team of over 85,000 employees Providing legendary customer experiences |
105,476 |
| 2 | 99,801 | |
| 3 |
Scotiabankscotiabank.com
A global financial institution serving customers, families, and communities by providing advice, products, and services to help them achieve success |
87,065 |
| 4 | 60,290 | |
| 5 | 47,865 | |
| 6 |
Manulifemanulife.com
Global financial services group providing insurance, wealth management, and asset management solutions to millions of customers worldwide. |
34,375 |
| 7 |
Rogers Communicationsrogers.com
Provider of communication services, supporting everyday connections and ensuring seamless connectivity for work and personal needs, with a focus on customer satisfaction |
28,500 |
| 8 |
Loblaw Companies Limitedloblaw.ca
Largest Canadian retailer offering grocery, pharmacy, health, beauty, financial services, apparel, and recognized brands like President’s Choice and no name. |
24,123 |
| 9 |
Canada Post / Postes Canadacanadapost-postescanada.ca
Nationwide postal service with extensive retail network, delivering parcels and mail to over 17 million Canadian addresses. |
23,941 |
| 10 |
City of Torontotoronto.ca
Provides diverse public services to residents, businesses, and visitors, encompassing technology, finance, culture, and innovation, employing a large workforce across numerous divisions. |
23,495 |
| 11 |
Intactintactfc.com
Providing insurance solutions to help individuals, businesses, and society thrive during good times and bounce back during challenging times |
21,693 |
| 12 |
Canada Lifecanadalife.com
Providing financial protection, retirement and investment solutions, workplace mental health support, and community project investments to enhance Canadians' well-being. |
13,569 |
| 13 |
University Health Networkuhn.ca
Largest Canadian research hospital network specializing in patient care, medical research, education, and fundraising for advanced healthcare services. |
11,930 |
| 14 |
RBC Capital Marketsrbccm.com
Global investment bank providing specialized expertise in capital markets, banking, and finance to corporations, institutional investors, asset managers, and governments across international markets. |
11,098 |
| 15 |
Ontario Power Generationopg.com
Leading clean power generator advancing clean energy innovations, striving for a net-zero future with diverse electricity generation fleet in Ontario and the United States |
9,878 |
| 16 |
City of Ottawa / Ville d’Ottawajobs-emplois.ottawa.ca
A diverse workforce providing essential programs and services for over one million residents in Ottawa, with a focus on customer service and community well-being |
9,194 |
| 17 |
Toronto Transit Commission (TTC)ttc.ca
A leading transit system in Toronto, providing safe and reliable transportation to over 17 million customers daily through various modes |
8,829 |
| 18 |
RBC Wealth Managementrbcwealthmanagement.com
Provides comprehensive wealth management, private banking, investment, and asset management solutions to high net worth individuals, families, and institutional clients across global markets. |
8,748 |
| 19 |
Unity Health Torontounityhealth.to
A health network in Toronto providing primary, community, specialized, and long-term care services, as well as investing in research and education |
8,686 |
| 20 |
GFL Environmental Inc.gflenv.com
A leading North American provider of environmental services for solid waste, liquid waste, and soil remediation, focusing on customer service, safety, and compliance |
8,244 |
| 21 |
Co-operatorscooperators.ca
Multi-line insurance, wealth management, and financial advisory services focused on community support, sustainability, and client-centered solutions across Canada. |
8,074 |
| 22 |
The Ottawa Hospitalottawahospital.on.ca
Innovative teaching and research hospital providing specialized care, developing new treatments, and improving patient care through community engagement and global impact |
7,679 |
| 23 |
Sunnybrooksunnybrook.ca
A leading teaching hospital affiliated with the University of Toronto, specializing in patient care, groundbreaking research, and inventing the future of healthcare |
7,599 |
| 24 |
London Health Sciences Centre (LHSC)lhsc.on.ca
Acute care teaching hospital offering specialized clinical services, leading in discovery and innovation, providing exceptional patient care and training healthcare professionals |
7,092 |
| 25 |
Hamilton Health Scienceshamiltonhealthsciences.ca
Healthcare organization delivering specialized cardiac, stroke, trauma, cancer, palliative, and pediatric care to southwestern Ontario and beyond. |
6,690 |
| 26 |
TD Securitiestdsecurities.com
A leading global provider of integrated capital markets products and services, offering underwriting, advisory, market access, transaction banking, and investment solutions |
6,544 |
| 27 |
Metrolinxmetrolinx.com
Provincial agency managing regional transportation through GO Transit, UP Express, and PRESTO while executing the largest transit infrastructure expansion in Ontario history. |
6,444 |
| 28 |
Aecon Group Inc.aecon.com
Provides integrated construction solutions for civil, urban transportation, nuclear, utility, and industrial sectors, plus project development, financing, investment, and operations. |
6,368 |
| 29 |
Purolator Inc.purolator.com
A leading Canadian provider of integrated freight, parcel, and logistics solutions, focusing on sustainable growth, community well-being, and delivering promises for over 50 years |
6,230 |
| 30 |
Trillium Health Partnersthp.ca
Leading hospital providing full range of acute care services, specialized programs, and community-based care Committed to delivering high-quality, accessible patient care |
6,009 |
| 31 |
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 |
| 32 |
Bayshore HealthCarebayshore.ca
Providing personalized home and community healthcare services across Canada, supporting clients' independence and quality of life with customized care plans. |
5,911 |
| 33 |
Hydro Onehydroone.com
Electricity transmission and distribution across Ontario, ensuring reliable power delivery and supporting infrastructure for homes and businesses. |
5,671 |
| 34 |
BMO Capital Marketscapitalmarkets.bmo.com
A leading North American financial services provider offering a complete range of investment and corporate banking products to clients worldwide |
5,451 |
| 35 |
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 |
| 36 |
Region of Peelpeelregion.ca
A diverse and inclusive organization in Peel Region delivering social services and infrastructure for residents and businesses, fostering a Community for Life |
4,959 |
| 37 |
St. Michael's Hospitalunityhealth.to
A leading hospital providing compassionate care, medical education in 27 disciplines, and research through the Keenan Research Centre for global impact |
4,868 |
| 38 |
TD Insurancetdinsurance.com
A leading insurance provider in Canada, offering protection for over four million individuals and families through home, auto, life, and health insurance |
4,647 |
| 39 |
City Of Hamiltonhamilton.ca
The organization aims to provide high-quality public services for a healthy, safe, and prosperous community while fostering collective ownership and diversity |
4,633 |
| 40 | 4,477 | |
| 41 |
Bruce Powerbrucepower.com
Operation of nuclear power plants generating clean, low-cost electricity supplying 30% of Ontario's power with strong community values. |
4,414 |
| 42 |
Definitydefinityfinancial.com
Parent company of several established Canadian property and casualty insurance brands focused on improving insurance for customers and communities. |
4,398 |
| 43 |
LifeLabs Medical Laboratory Serviceslifelabs.com
A leading Canadian provider of diagnostic information and digital health systems, offering laboratory tests, genetics services, and online patient portals |
4,356 |
| 44 |
William Osler Health Systemwilliamoslerhs.ca
Health system with three hospitals serving 13 million residents, providing a wide range of services including inpatient, outpatient, urgent care, and specialty clinics |
4,350 |
| 45 |
CIBC Capital Marketscibccm.com
Providing support and expertise to help clients access capital, expand operations, and invest through tailored industry-leading solutions in financial markets globally |
4,231 |
| 46 |
Sinai Healthsinaihealth.ca
A leading academic health science centre focused on integrated care, innovative research, and educating future healthcare leaders for comprehensive patient care |
4,083 |
| 47 |
York Region (The Regional Municipality of York)york.ca
The company provides services to 12 million residents, 54,000 businesses, and 650,000 employees in a two-tier government structure |
3,799 |
| 48 |
Health | Santéontario.ca
Focused on protecting and strengthening publicly funded health care in Ontario by providing patient-focused, sustainable, and high-quality care for all residents |
3,762 |
| 49 |
Lakeridge Healthlakeridgehealth.on.ca
A comprehensive healthcare provider with multiple hospitals, specialty centers, and community services, committed to delivering high-quality care to the region |
3,760 |
| 50 |
Canadian Blood Servicesblood.ca
Canada's national organization responsible for ensuring a secure and sustainable supply of blood and organs for transfusion and transplantation |
3,745 |
| 51 |
ParaMed Home Health Careparamed.com
Provider of home care and wellness solutions in Canada since 1974, offering fully trained care providers, ongoing training, support programs, and a strong workforce focused on core values |
3,524 |
| 52 |
NAV CANADAnavcanada.ca
Operates Canada's civil air navigation service, ensures safe and efficient aircraft movement, provides air traffic control, weather briefings, and navigation aids |
3,416 |
| 53 |
Libertyjobs.libertyenergyandwater.com
Provider of essential energy and water services, including clean, renewable power generation, with a focus on sustainability and customer satisfaction |
3,364 |
| 54 |
Humber River Healthhrh.ca
Leading digital hospital in North America using technology and clinical expertise to improve patient care, reduce errors, and drive community academic healthcare advancements |
3,272 |
| 55 |
Niagara Healthniagarahealth.on.ca
Regional hospital system providing acute care services, research, and innovation to improve healthcare for residents in the Niagara region |
3,213 |
| 56 |
Mackenzie Healthmackenziehealth.ca
Regional healthcare provider in Southwest York Region with two hospitals and community-based services, offering a wide range of healthcare programs and services to the community |
3,197 |
| 57 |
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 |
| 58 |
Ontario Health | Santé Ontarioontariohealth.ca
Government agency ensuring high-quality, patient-centred healthcare services across Ontario, promoting health equity and supporting healthcare professionals. |
3,020 |
| 59 |
St. Joseph's Healthcare Hamiltonstjoes.ca
A values-based academic health science centre affiliated with McMaster University and Mohawk College, committed to providing integrated, compassionate care and advancing research and education |
2,983 |
| 60 |
RBC Insurancerbcinsurance.com
A market leader in insurance, offering a wide range of life, health, home, auto, travel, and wealth solutions to individuals and groups across Canada Additionally, providing reinsurance solutions globally |
2,965 |
| 61 |
Mount Sinai Hospital (Toronto), Sinai Healthmountsinai.on.ca
Internationally recognized academic health sciences center providing exemplary patient care, nursing excellence, and top employer culture Flagship clinical programs available |
2,951 |
| 62 |
North York General Hospitalnygh.on.ca
A leading community academic hospital in Canada offering a wide range of acute, ambulatory, and long-term care services with a focus on patient- and family-centered care |
2,917 |
| 63 |
Canadian Coast Guard/Garde côtière canadiennecanada.ca
A federal agency that operates a civilian fleet and provides maritime services to Canadians, ensuring safe waters, environmental protection, and economic growth |
2,892 |
| 64 |
Corus Entertainmentcorusent.com
Development and delivery of diverse multimedia content including television, radio, digital platforms, and streaming services for global audiences. |
2,864 |
| 65 | 2,851 | |
| 66 |
Scotia Wealth Managementscotiawealthmanagement.com
Wealth management professionals offering investment services, wealth solutions, and comprehensive financial planning to affluent individuals, entrepreneurs, and families |
2,809 |
| 67 |
Desjardins Insurancedesjardins.com
A financial group offering insurance products through Certas and Desjardins Financial Security, with agents in Ontario, Alberta, and New Brunswick |
2,797 |
| 68 |
Kingston Health Sciences Centrekingstonhsc.ca
Top Canadian hospital, advancing health care through patient care, medical research, and training future healthcare professionals for Southeastern Ontario. |
2,793 |
| 69 |
CHEOcheo.on.ca
A global leader in pediatric health care and research, providing excellence in complex care, education, and community partnership for children and youth |
2,784 |
| 70 |
Porter Airlines Inc.flyporter.com
Elevates economy air travel experience, providing genuine hospitality with style. Operates Embraer and De Havilland aircraft across North America, including Canada, US, Mexico, Caribbean. |
2,769 |
| 71 |
Durham Region (The Regional Municipality of Durham)durham.ca
Durham Region provides a wide range of services to a group of diverse communities, including paramedics, recycling, water supply, transit, and social programs |
2,624 |
| 72 |
Southlake Healthsouthlake.ca
Delivering healthcare services to northern York Region and southern Simcoe County through advanced programs, exceptional staff, and a commitment to patient safety and quality care |
2,601 |
| 73 | 2,564 | |
| 74 |
Scarborough Health Networkshn.ca
A leading healthcare organization in Scarborough, offering diverse programs and services, including nephrology, cardiac care, spine center, and medical training partnerships with universities |
2,536 |
| 75 |
Bank of Canadabankofcanada.ca
Central bank focused on maintaining low, stable inflation and promoting economic and financial welfare for Canada's overall economic health. |
2,496 |
| 76 |
BMO Nesbitt Burnsbmo.com
A full-service investment and wealth advisory organization within a financial group, offering comprehensive services through a large network of Investment Advisors |
2,478 |
| 77 |
Scotiabank - Global Banking and Marketsgbm.scotiabank.com
A global wholesale bank providing expertise, experience, and dedication to meet business needs while adhering to social media disclaimer |
2,464 |
| 78 |
Halton Healthcarelinktr.ee
A healthcare organization with three community hospitals providing services to nearly 400,000 residents in Halton Hills, Milton, and Oakville, focused on exemplary patient experiences |
2,461 |
| 79 |
Meridian Credit Unionmeridiancu.ca
An organization focused on creating an empowering and collaborative workplace, prioritizing employee well-being, community involvement, and long-term member relationships |
2,269 |
| 80 |
RBC Investor Servicesrbcis.com
Provides investment servicing solutions to asset managers, owners, insurers, and financial institutions, focusing on asset protection and growth worldwide. |
2,230 |
| 81 |
Michael Garron Hospitaltehn.ca
A vibrant community hospital in East Toronto providing high-quality, patient-centred healthcare services along the continuum of care with strong partnerships |
2,219 |
| 82 |
Royal Victoria Regional Health Centrervh.on.ca
Healthcare institution in Barrie, Ontario serving over 450,000 residents with specialized services like interventional radiology, stroke care, trauma, cancer, heart, child, and youth programs |
2,191 |
| 83 |
Region of Waterlooregionofwaterloo.ca
Provides municipal services including transit, waste management, health, housing, and employs over 3,500 people in diverse roles. |
2,165 |
| 84 |
FedEx Canadafedex.com
Global logistics and transportation provider with domestic and international shipping services, advanced tracking systems, automated customs clearance, and a dedicated transportation network |
2,111 |
| 85 |
CIBC Melloncibcmellon.com
A Canadian company offering investment servicing solutions to institutional investors, with over C$26 trillion in assets under administration |
2,088 |
| 86 |
Grand River Hospitalwrhn.ca
Ontario's large community hospital in Kitchener - Waterloo, offering a wide range of medical programs and services with over 6000 team members |
2,058 |
| 87 |
Fidelity Canadafidelity.ca
Providing trusted investment portfolios and financial services to Canadian individuals and institutions, supporting better financial futures nationwide. |
2,052 |
| 88 |
Niagara Regionniagararegion.ca
Providing essential municipal services including water, roads, waste collection, public safety, and housing to support a diverse community. |
2,038 |
| 89 |
Halton Regionhalton.ca
Providing high-quality programs and services supporting safe, healthy communities and economic growth across multiple municipalities in Halton Region. |
1,992 |
| 90 |
Oak Valley Healthoakvalleyhealth.ca
A leading Ontario community health care organization with two hospitals and a Reactivation Care Centre, providing high-quality, patient-centered care Funded by community donations |
1,969 |
| 91 |
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 |
| 92 |
Dynacaredynacare.ca
Leading provider of health and wellness solutions in Canada through accurate diagnostic information, innovative technology, and specialized health services for individuals, insurance industry, workplaces, and diagnostics |
1,954 |
| 93 |
BMO Commercial Bankcommercial.bmo.com
A financial partner providing strategic financing plans and customized solutions, leveraging global resources with localized knowledge to help businesses succeed |
1,917 |
| 94 |
Bell Technical Solutions
Specializing in installation and maintenance of telecommunications services, our goal is to enhance connectivity for Canadians through innovation and exceptional customer experience |
1,908 |
| 95 |
VON Canadavon.ca
A nonprofit organization providing innovative clinical, personal, and social support services for people to live comfortably in their own homes |
1,879 |
| 96 |
Toronto Hydrotorontohydro.com
Operate and maintain electricity distribution system serving nearly 793,000 customers, ensuring safe, reliable power supply in Toronto. |
1,861 |
| 97 |
City of Markhammarkham.ca
Fast-growing city with diverse communities, strong tech industry, numerous corporate headquarters, quality infrastructure, and recognized as a top government employer. |
1,839 |
| 98 | 1,837 | |
| 99 |
Health Sciences North/Horizon Santé-Nordhsnsudbury.ca
An integrated network providing high-quality patient care, research, teaching, and services in various medical specialties to communities in Northern Ontario |
1,755 |
| 100 |
City of London, Canadalondon.ca
A large team of over 3000 employees in London delivering 100+ services, working together to build a better city for all |
1,749 |
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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 Oct 24, 2026.
More company lists in Ontario
- The largest companies in Ontario 4,330
- Financial services firms in Ontario 315
- SaaS companies in Ontario 232
- Financial Services companies in Ontario 228
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- Transportation, Logistics, Supply Chain and Storage companies in Ontario 196
- Public sector organisations in Ontario 196
- Hospitals and Health Care companies in Ontario 195
- Software Development companies in Ontario 188
- IT Services and IT Consulting companies in Ontario 179
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- Education providers in Ontario 148
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- Government Administration companies in Ontario 128
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- Contract manufacturers in Ontario 113
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- Non-profit Organizations companies in Ontario 106
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- Distributors and wholesalers in Ontario 100
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The same list elsewhere in Canada
- Critical infrastructure operators in Canada 569
- Critical infrastructure operators in the province of Quebec 101
- Critical infrastructure operators in Alberta 94
- Critical infrastructure operators in British Columbia 51
- Critical infrastructure operators in Toronto 104
- Critical infrastructure operators in Calgary 64
- Critical infrastructure operators in Montreal 43