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Critical infrastructure operators headquartered in Montreal

Tamtam tracks 43 critical infrastructure operators headquartered in Montreal. This list ranks all of them by number of employees on LinkedIn, led by Bell, National Bank of Canada and Hydro Québec. Their median headcount is 1,228. Half of them were founded in 1978 or later.

🇨🇦 Montreal43 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
Bellletstalk.bell.ca

A leading Canadian communications company offering advanced wireless, internet, TV, media, and business services, as well as supporting social and economic prosperity

Telecommunications 🇨🇦 Montreal 34,053 1880
2
National Bank of Canadabnc.ca

Financial institution focusing on personal and business financial advice, community empowerment, innovation, and building lasting client relationships.

Banking 🇨🇦 Montreal 19,342 1859
3
Hydro Québechydroquebec.com

Production, transmission, and distribution of electricity primarily from renewable hydroelectric sources, including research and technology development in energy efficiency.

Renewable Energy Power Generation 🇨🇦 Montreal 16,160 1944
4
CNcn.ca

A North American transportation and logistics leader offering integrated shipping solutions, including rail, intermodal, trucking, warehousing, and distribution services

Rail Transportation 🇨🇦 Montreal 12,816 1919
5
Santé Québec Centre-Sud-de-l’Île-de-Montréal – Universitaireciusss-centresudmtl.gouv.qc.ca

The CIUSSS of Centre-South of Montreal provides healthcare and social services to nearly 300,000 Montreal residents, with a focus on various specialties and research

Hospitals and Health Care 🇨🇦 Montreal 5,068 2015
6
Centre universitaire de santé McGill | McGill University Health Centrecusm.ca

An internationally recognized academic health institution providing excellent clinical programs, research, and teaching to advance patient care and knowledge in healthcare

Hospitals and Health Care 🇨🇦 Montreal 4,668 n/a
7
CHUM - Centre hospitalier de l'Université de Montréalchumontreal.qc.ca

Provides general, specialized, and highly specialized care to adult patients, conducts research, offers teaching, and promotes health to 40% of Quebec's population.

Hospitals and Health Care 🇨🇦 Montreal 4,507 1996
8
Cogeco Inc.corpo.cogeco.com

Provides internet, video, and phone services to residential and business customers in Canada and the United States, plus operates radio stations.

Telecommunications 🇨🇦 Montreal 4,305 1957
9
Société de transport de Montréalstm.info

The STM plays a vital role in the public transportation sector, providing reliable and sustainable travel options for over 14 million daily commuters in Montreal

Truck Transportation 🇨🇦 Montreal 3,773 1861
10
CIUSSS du Nord-de-l'île-de-Montréalciusssnordmtl.ca

A healthcare organization providing services to over 450,000 residents in Montreal and specialized care to 18 million Quebecers, focusing on research, education, and innovation in health

Hospitals and Health Care 🇨🇦 Montreal 3,376 2015
11
CIUSSS de l'Est-de-l'Île-de-Montréalciusss-estmtl.gouv.qc.ca

The integrated university health and social services center in East Montreal manages multiple hospitals and mental health institute, affiliated with University of Montreal

Hospitals and Health Care 🇨🇦 Montreal 3,232 2015
12
Laurentian Bankbanquelaurentienne.ca

Provides retail banking, specialized SME and real estate financing, brokerage services, and investment products through subsidiaries and advisors nationwide.

Banking 🇨🇦 Montreal 2,876 n/a
13
Air Transatairtransat.com

A leading integrated international tourism company specializing in vacation packages, hotel stays, and air travel to over 60 destinations in the Americas and Europe Committed to sustainable tourism development

Airlines and Aviation 🇨🇦 Montreal 2,686 1987
14
Santé Québec Centre-Ouest-de-l'Île-de-Montréal - Universitaireciussscentreouest.ca

A healthcare network in West-Central Montreal providing seamless care to over 345,000 residents through various member facilities and a large staff of healthcare professionals and doctors

Hospitals and Health Care 🇨🇦 Montreal 2,681 2015
15
CHU Sainte-Justinechusj.org

The largest mother-child hospital in Canada, CHU Sainte-Justine employs 5,000 staff and 500 healthcare professionals, prioritizing innovation and patient-centered care

Hospitals and Health Care 🇨🇦 Montreal 2,482 n/a
16
VIA Rail Canadaviarail.ca

A national passenger rail service in Canada, providing safe, cost-effective, and environmentally responsible travel experiences, connecting over 400 communities with innovative projects

Rail Transportation 🇨🇦 Montreal 2,343 1977
17
Cogeco Connexioncogeco.ca

provides fiber-powered internet, TV, and home phone services with local support in smaller cities across Ontario and Quebec.

Telecommunications 🇨🇦 Montreal 1,827 n/a
18
Fairstone Bankfairstone.ca

A financial services group providing value-driven solutions for consumers and businesses, focusing on enhancing customer loyalty and delivering confident borrowing experiences

Financial Services 🇨🇦 Montreal 1,539 1926
19
National Bank Financialnbfwm.ca

A top Canadian securities broker providing wealth management services for individuals, corporations, and governments with nearly 1,000 investment advisors nationwide

Financial Services 🇨🇦 Montreal 1,427 n/a
20
belairdirectbelairdirect.com

A leading insurance company in Canada simplifying the insurance process with innovative products and personalized experiences for over 65 years

Insurance 🇨🇦 Montreal 1,421 1955
21
Transattransat.com

An international tourism company that offers vacation packages, hotel stays, and air travel to over 60 destinations in the Americas and Europe with a focus on sustainable tourism

Travel Arrangements 🇨🇦 Montreal 1,303 1987
22
Santé Québec - Institut de cardiologie de Montréalicm-mhi.org

A highly specialized hospital focusing on cardiology, dedicated to care, research, education, prevention, rehabilitation, and evaluating new technologies in the field

Medical Practices 🇨🇦 Montreal 1,228 1954
23
Énergirenergir.com

Natural gas distribution in Quebec and Vermont, renewable electricity production, energy efficiency, innovative energy projects, and diverse energy services.

Oil and Gas 🇨🇦 Montreal 1,194 1957
24
Logisteclogistec.com

provides marine and environmental services across North America with over 3,200 employees serving from the Arctic to the US Gulf

Transportation, Logistics, Supply Chain and Storage 🇨🇦 Montreal 845 n/a
25
Montreal Policespvm.qc.ca

A municipal police force serving Montréal with over 6000 employees, responding to safety needs, managing 32 local stations on the island

Law Enforcement 🇨🇦 Montreal 770 1843
26
Quebecorquebecor.com

Leading Canadian integrated communications company combining telecommunications, media, entertainment, publishing, cultural product distribution, event production, and community involvement.

Telecommunications 🇨🇦 Montreal 745 1950
27
Hopital Maisonneuve-Rosemontmaisonneuve-rosemont.org

Medical practice specializing in providing healthcare services located in Montreal, Quebec, Canada

Medical Practice 🇨🇦 Montreal 740 1954
28
Urgences-santéurgences-sante.qc.ca

Public organization providing prehospital emergency medical services and communication for urgent health calls in Montreal and Laval regions.

Government Administration 🇨🇦 Montreal 719 1989
29
Valero Energy Inc.energievalero.ca

A leading energy company in Quebec with a refinery, logistics infrastructures, supporting local energy security and economy, fostering values and talented employees

Oil and Gas 🇨🇦 Montreal 636 1980
30
Exo – Réseau de transport métropolitainexo.quebec

Public transportation provider in Montreal's north and south shores, offering integrated train, bus, and paratransit services focused on innovation and efficient travel experiences

Truck Transportation 🇨🇦 Montreal 595 2017
31
Air Inuitairinuit.com

Specializes in providing vital air transport services to remote Inuit communities in northern Quebec, offering passenger, cargo, and emergency flights

Airlines and Aviation 🇨🇦 Montreal 562 1978
32
TFI International Inc.tfiintl.com

A leading transportation and logistics company in North America, specializing in strategic acquisitions and managing a network of operating subsidiaries across the US and Canada

Truck Transportation 🇨🇦 Montreal 546 n/a
33
Sun Life Québecsunlife.ca

A leading financial services organization offering insurance and investment products in multiple global markets, with a focus on helping clients achieve financial security

Insurance 🇨🇦 Montreal 382 n/a
34
National Bank Private Banking 1859privatebanking1859.ca

Wealth management firm offering personalized advice and services to affluent individuals and their families, focusing on growth, sustainability, and philanthropy

Banking 🇨🇦 Montreal 101 2009
35
Transport Hervé Lemieuxtransportlemieux.com

Established in 1947, a leading transport company in Quebec offering general, specialized transport services and private fleet management, focusing on customer satisfaction and safety

Truck Transportation 🇨🇦 Montreal 93 1947
36
Caisse Desjardins du Centre-nord de Montréaldesjardinscentrenord.com

A financial services company providing tailored solutions for individuals, businesses, and corporations, focusing on innovation, community enrichment, and sustainable development

Financial Services 🇨🇦 Montreal 39 2018
37
Caisse Desjardins du Centre-est de Montréaldesjardins.com

A financial institution in Montreal's east region with a mission to support economic and social development through personalized business solutions for members and clients

Financial Services 🇨🇦 Montreal 31 2018
38
IA groupe financieria.ca

Provides financial services to individuals and businesses, offering a range of solutions for managing and optimizing finances

Financial Services 🇨🇦 Montreal 31 n/a
39
Argus Transportargustransport.com

Technology-driven trucking and logistics carrier operating in Canada and the USA since 1977, focusing on customer service and people investment.

Truck Transportation 🇨🇦 Montreal 26 1977
40
Caisse Desjardins du Plateau-Mont-Royaldesjardins.com

A leading financial group in Canada dedicated to improving the well-being of individuals and communities through sustainable partnerships and actions

Financial Services 🇨🇦 Montreal 25 2016
41
Desjardins Business West of Montrealdesjardins.com

A team of 62 professionals offering a comprehensive range of financial services, including business financing, savings management, capital markets, treasury solutions, insurance, investments, and more

Banking 🇨🇦 Montreal 18 n/a
42
HYDROMÉGA Services Inc.hydromega.com

Independent renewable energy producer in Quebec and Ontario since 1987, specializing in constructing and operating hydroelectric facilities sold to Hydro-Quebec and Ontario Power Authority

Utilities 🇨🇦 Montreal 9 1987
43
HYDROMEGAhydromega.com

A leading renewable power producer and developer in Eastern Canada, established in Québec in 1987

Renewable Energy Power Generation 🇨🇦 Montreal 8 1987

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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 Oct 24, 2026.

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