Tamtam Start free

100 leading critical infrastructure operators in Belgium

Tamtam tracks 297 critical infrastructure operators headquartered in Belgium. This list ranks the 100 largest by number of employees on LinkedIn, led by BNP Paribas Fortis, KBC Bank & Verzekering and Proximus Group. Their median headcount is 1,448. Half of them were founded in 1989 or later. The most common headquarters are Brussels (32), Antwerp (9) and Liège (5).

🇧🇪 Belgium100 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
BNP Paribas Fortisbnpparibasfortis.be

A financial institution dedicated to positive growth, offering solutions to make customers' lives easier and promoting sustainability through various initiatives

Banking 🇧🇪 Brussels 13,663 n/a
2
KBC Bank & Verzekeringkbc.be

A leading integrated bank-insurer focused on individuals, private banking clients, and small to medium-sized enterprises in Belgium, Central and Eastern Europe Operating worldwide selectively

Financial Services 🇧🇪 Brussels 13,565 1998
3
Proximus Groupproximus.com

Provider of connectivity and digital services in Benelux and global markets, investing in networks, digital ecosystems, and innovative communication solutions.

Telecommunications 🇧🇪 Brussels 13,297 n/a
4
Bnodebnode.com

Operating across Europe, North America, Asia-Pacific, specialized business units provide 3PL, fulfillment, cross-border e-commerce logistics, and last-mile delivery services.

Transportation, Logistics, Supply Chain and Storage 🇧🇪 Brussels 9,028 n/a
5
NMBS-SNCBbelgiantrain.be

Belgian transport company focused on safe, eco-friendly travel with a customer-centric approach, emphasizing punctuality, career development, and railway family values

Rail Transportation 🇧🇪 Sint-Gillis 8,702 1926
6
Belfiusbelfius.be

Provides financial products and services to a wide range of clients, from individuals to large corporations and local governments, focusing on societal impact.

Financial Services 🇧🇪 Saint-Josse-ten-Noode 7,291 n/a
7
Eurocleareuroclear.com

A global provider of settlement and related services for bond, equity, ETFs, and mutual fund transactions, with a diverse and inclusive culture

Financial Services 🇧🇪 Brussels 5,937 1968
8
Swiftswift.com

Provides secure financial messaging, connecting over 11,000 organizations in 200+ countries, offering a platform, products, and services for communication and compliance.

Financial Services 🇧🇪 La Hulpe 5,640 1973
9
bpostgroupbpostgroup.com

The company focuses on creating connections through personalized services, constant improvement, challenging projects, collaborations, latest technologies, job opportunities, and training programs

Transportation, Logistics, Supply Chain and Storage 🇧🇪 Brussels 5,309 n/a
10
Infrabelinfrabel.be

A Belgian company maintaining railway infrastructure, coordinating train traffic, and focusing on innovation to develop sustainable and modern mobility solutions

Rail Transportation 🇧🇪 Brussels 5,279 2005
11
UZ Leuvenuzleuven.be

The company is a leading healthcare institution in Belgium and Europe, specializing in patient care, medical education, and groundbreaking scientific research

Hospitals and Health Care 🇧🇪 Leuven 4,900 n/a
12
ING Belgiuming.com

Global financial institution driving sustainable progress through innovation, technology, and customer-centric banking, with diverse teams shaping the future

Financial Services 🇧🇪 Brussels 4,728 n/a
13
Telenet grouptelenet.be

A leading provider of media, telecommunications, and entertainment services in Belgium, offering seamless connectivity, innovative products, and superior customer experiences across three main brands

Telecommunications 🇧🇪 Mechelen 4,238 1996
14
STIB-MIVBstib-mivb.be

Public urban transport network serving Brussels and surrounding communes with metro, tram, bus, and night bus lines for commuters.

Travel Arrangements 🇧🇪 Brussels 4,232 1954
15
AG Insuranceag.be

Leading insurer in Belgium with a 200-year history, focusing on long-term relationships, sustainability, employee growth, and investing in the local economy

Insurance 🇧🇪 Brussels 4,068 1824
16
Fluviusfluvius.be

A multi-utility provider in Flanders managing millions of connections for electricity, gas, cable, and sewage in all 300 Flemish municipalities

Utilities 🇧🇪 Melle 3,771 2019
17
UZ Gentuzgent.be

Specialized healthcare provider offering high-quality patient care, teaching, research, and services, with a wide range of primary and specialized treatments

Hospitals and Health Care 🇧🇪 Ghent 3,767 1959
18
ENGIE Belgiumengie.be

Belgian market leader in electricity, natural gas, and energy services, offering innovative solutions for more economical, low-carbon energy use

Utilities 🇧🇪 Brussels 3,272 n/a
19
De Lijndelijn.be

A transportation provider focused on delivering a smooth, safe, and eco-friendly travel experience, catering to the diverse needs of its passengers

Travel Arrangements 🇧🇪 Mechelen 3,264 1991
20
Brussels Airlinesbrusselsairlines.com

Airline connecting Brussels with over 90 destinations including Africa, focusing on sustainability and promoting Belgian culture globally.

Airlines and Aviation 🇧🇪 Diegem 3,064 2002
21
Elia Groupelia.be

Operation of extensive high-voltage electricity transmission networks in Belgium and Germany, ensuring balanced supply and supporting energy transition.

Utilities 🇧🇪 Brussels 2,759 2001
22
UZ Brusseluzbrussel.be

Quality healthcare in a Dutch-speaking university hospital, providing care for all regardless of language or beliefs, while respecting individual autonomy

Hospitals and Health Care 🇧🇪 Brussels 2,704 1977
23
EUROCONTROLeurocontrol.int

The company supports European aviation by delivering technical excellence and expertise in air traffic management, addressing industry challenges and promoting future evolution

Airlines and Aviation 🇧🇪 Brussels 2,639 1960
24
Dexiadexia.com

A financial group managed in resolution, Dexia offers diverse career opportunities focused on agility, cohesion, trust, and public interest engagement

Financial Services 🇧🇪 Brussels 2,600 n/a
25
UZAuza.be

Dedicated to serving patients and healthcare providers of the future with a commitment to excellence and a strong online ethical code

Hospitals and Health Care 🇧🇪 Edegem 2,461 1979
26
Argentaargenta.be

A growing banking and insurance group in Belgium with nearly 500 offices, offering a customer-friendly approach to providing savings, investments, loans, and insurance products

Banking 🇧🇪 Antwerp 2,455 1956
27
CHU de Liègechuliege.be

A public, university hospital in Liège, Belgium offering a wide range of healthcare professions, prioritizing patient care, and providing stability and work-life balance

Hospitals and Health Care 🇧🇪 Liège 2,333 1987
28
Megamega.be

provider of energy contracts and mobile subscriptions for individuals and professionals with online management and personalized local customer service

Utilities 🇧🇪 Liège 2,262 2013
29
CHIREC Hospital Groupchirec.be

The organization operates multiple hospital sites, offering a wide range of medical and surgical services, along with day care centers and polyclinics

Hospitals and Health Care 🇧🇪 Auderghem 2,241 n/a
30
Independent Health Insurance Fundsmloz.be

Group of three independent Belgian health insurance funds providing coverage and well-being services to over 2.3 million members nationwide.

Insurance 🇧🇪 Anderlecht 2,237 n/a
31
Q8q8.be

A top energy provider in Europe, offering service stations, convenience stores, lubricants, airport fueling, and advancing towards sustainable mobility solutions

Oil and Gas 🇧🇪 Antwerp 2,166 n/a
32
P&V Groupchouettejob.be

Belgian cooperative insurance group offering insurance solutions for individuals, self-employed, businesses, and institutions through independent brokers and exclusive agents Developing legal protection solutions under separate label

Insurance 🇧🇪 Brussels 2,139 n/a
33
ZNA - Ziekenhuis Netwerk Antwerpenzas.be

Leading healthcare organization in Belgium offering accessible and quality healthcare services through multiple hospitals, day centers, specialized facilities, and dedicated staff

Hospitals and Health Care 🇧🇪 Antwerp 2,042 2004
34
CHU Brugmannchu-brugmann.be

A large hospital in Brussels with 853 beds, 29,000 admissions, and 360,000 outpatient visits annually Known for its social, university, and technical characteristics

Hospitals and Health Care 🇧🇪 Brussels 1,943 1923
35
Cliniques universitaires Saint-Lucsaintluc.be

Leading academic hospital in Brussels, offering specialized care, research, and education to patients from Belgium and beyond, with a focus on patient-centered values and collaboration

Hospitals and Health Care 🇧🇪 Brussels 1,889 1976
36
National Bank of Belgiumnbb.be

Ensuring economic stability through price control, financial system security, safe cash, efficient payments, and providing financial data and analysis.

Banking 🇧🇪 Brussels 1,832 1850
37
Ziekenhuis Oost-Limburg (ZOL)zol.be

A public hospital with over 1000 beds, 400 doctors, and 3900 employees across 4 campuses, providing high-quality medical care

Hospitals and Health Care 🇧🇪 Genk 1,779 n/a
38
ORESores.be

Operator managing gas, electricity, and public lighting networks in 200 Wallonian municipalities, supplying energy to over 13 million households and businesses

Utilities 🇧🇪 Gosselies 1,756 2009
39
Jessa Ziekenhuisjessazh.be

Prioritizing patient care over size, this organization aims to excel in delivering healthcare services with a focus on quality and compassion

Hospitals and Health Care 🇧🇪 Hasselt 1,736 n/a
40
Ethiasethias.be

A Belgian insurer with a unique business model focused on direct, digital, and public sectors, innovating in health, mobility, and housing ecosystems with a socially responsible approach

Insurance 🇧🇪 Liège 1,648 1919
41
Hôpital Erasme - Cliniques Universitaires de Bruxelleserasme.ulb.ac.be

Academic hospital affiliated with a university, providing patient care, education, and research in various specialized fields with over 3,000 staff members

Medical Practices 🇧🇪 Anderlecht 1,633 1977
42
AZ Sint-Jan Brugge AVazsintjan.be

A healthcare institution in West-Flanders providing innovative, inclusive healthcare with a focus on top medical domains and extensive collaborations for quality care

Hospitals and Health Care 🇧🇪 Bruges 1,613 1150
43
Baloise BEbaloise.be

Insurance company offering tailored solutions for individuals and businesses, focusing on customer priority, innovation, and sustainable partnerships.

Insurance 🇧🇪 Antwerp 1,606 n/a
44
AZ Deltaazdelta.be

Multicampus hospital with 1400 beds, 385 specialists, and 4000 staff providing high-quality, patient-centered medical care and services.

Hospitals and Health Care 🇧🇪 Rumbeke 1,590 2013
45
CHC Groupe santéchc.be

A network of healthcare facilities in the province of Liège providing advanced technology and quality service for effective and compassionate medical care

Hospitals and Health Care 🇧🇪 Liège 1,535 1976
46
Hôpital Citadellecitadelle.be

Large public hospital offering advanced medical treatments across all pathologies, emphasizing patient-centered care, solidarity, and regional employment.

Hospitals and Health Care 🇧🇪 Liège 1,515 n/a
47
az groeningeazgroeninge.be

A dynamic healthcare organization with a network of hospitals, focusing on quality care, innovation, and patient-centered services with a diverse and collaborative approach

Hospitals and Health Care 🇧🇪 Kortrijk 1,501 n/a
48
Brussels Airportbrusselsairport.be

Handling millions of passengers and freight annually, connecting Belgium globally, creating thousands of jobs, and operating as a key economic hub.

Airlines and Aviation 🇧🇪 Zaventem 1,493 n/a
49
Zorgbedrijf Antwerpenzorgbedrijf.antwerpen.be

A provider of a wide range of care services including service flats, home care, youth services, and products for seniors in Antwerp

Hospitals and Health Care 🇧🇪 Antwerp 1,480 2009
50
Degroof Petercamdegroofpetercam.com

Belgian investment house providing wealth management, investment management, and investment banking services to private families, corporations, and institutional investors across Europe and Asia.

Financial Services 🇧🇪 Brussels 1,448 1871
51
CHU UCL Namurchuuclnamur.be

Private hospital offering extensive medical and surgical care, maternity services, cancer treatment, advanced imaging, and personalized patient support.

Hospitals and Health Care 🇧🇪 Yvoir 1,442 2016
52
CHU de Charleroi - ISPPChumani.be

A healthcare group comprising multiple hospitals, day clinics, dialysis centers, and nursing homes, employing 6000 staff and 600 doctors, with research and educational facilities

Individual and Family Services 🇧🇪 Charleroi 1,378 n/a
53
Luminusluminus.be

A leading energy company in Belgium, specializing in onshore wind energy, hydropower, and natural gas power plants to provide electricity and energy services

Electric Power Generation 🇧🇪 Saint-Josse-ten-Noode 1,365 n/a
54
Vitazvitaz.be

Dynamic hospital offering top-quality healthcare services through innovation and specialization Providing accessible healthcare on 6 campuses, prioritizing patient care and collaboration with other providers

Hospitals and Health Care 🇧🇪 Sint-Niklaas 1,357 n/a
55
Bpostbpostgroup.com

bpost connects people, businesses, and communities through personalized service, continuously improving products and services, offering challenging projects, collaborations, and job opportunities

Transportation, Logistics, Supply Chain and Storage 🇧🇪 Brussels 1,321 n/a
56
Beobank NV/SAbeobank.be

Belgian bank supporting individuals, self-employed, and SMEs with banking products, services, and personalized solutions through its network and dedicated coworkers.

Financial Services 🇧🇪 Brussel/Bruxelles 1,301 2012
57
UMC Sint-Pieter - CHU Saint-Pierrestpierre-bru.be

Affiliated with top medical schools, the organization provides health teaching, research, and clinical services in various specialties with a focus on minimally-invasive techniques

Hospitals and Health Care 🇧🇪 Bruxelles / Brussel 1,263 1174
58
Fluxysfluxys.com

A global energy infrastructure group focused on transporting carbon-neutral energy carriers, storing carbon dioxide, and operating gas transmission & storage facilities

Utilities 🇧🇪 Brussels 1,259 2001
59
Port of Antwerp-Brugesportofantwerpbruges.com

Management and maintenance of port infrastructure, ensuring safe shipping traffic, providing equipment, and promoting sustainable port development and growth.

Maritime Transportation 🇧🇪 Antwerp 1,257 1997
60
P&Vpv.be

Belgian cooperative insurance group offering life and non-life insurance products to individuals, businesses, and institutions through multiple brands and channels.

Insurance 🇧🇪 Brussels 1,253 n/a
61
Crelancrelan.be

Provides banking and insurance products to individuals, self-employed, entrepreneurs, and specialized financial advice for agriculture and horticulture sectors through independent agents.

Banking 🇧🇪 Brussels 1,216 2013
62
OLV Ziekenhuis Aalst-Asse-Ninoveolvz.be

A leading private hospital in Belgium with a strong national and international reputation, providing expert patient care and opportunities for driven professionals to grow

Hospitals and Health Care 🇧🇪 Aalst 1,177 n/a
63
Ageas Groupageas.com

An international insurance group with over 190 years of experience offering life and non-life insurance products tailored for retail and business customers

Insurance 🇧🇪 Saint-Josse-ten-Noode 1,174 1824
64
Grand Hôpital de Charleroighdc.be

Large modern hospital complex offering comprehensive acute and chronic medical care with specialized departments, advanced technology, and patient-centered services.

Hospitals and Health Care 🇧🇪 Charleroi 1,169 1962
65
Emmaus

Providing comprehensive health and welfare services through a network of over 20 facilities, including hospitals, mental health care, elder care, and support for disabilities and families

Hospitals and Health Care 🇧🇪 Mechelen 1,106 1998
66
AZ Sint-Lucas Gentazstlucas.be

A modern and social hospital located in Gent, with medical centers in other towns, offering hospitalization and day care services

Hospitals and Health Care 🇧🇪 Ghent 1,100 n/a
67
CBC Banque & Assurancecbc.be

Independent Belgian bank and insurance provider with extensive regional presence, focusing on long-term client relationships and high-value solutions.

Banking 🇧🇪 Namur 1,081 n/a
68
AZ Maria Middelaresmariamiddelares.be

A pioneering hospital in the outskirts of Gent, offering cutting-edge medical care with a focus on patient experience and building strategic partnerships for superior healthcare services

Hospitals and Health Care 🇧🇪 Ghent 1,079 n/a
69
Circet Beneluxcircet-benelux.eu

Building and managing vital infrastructure with expertise in fiber optic networks, mobile telecom, EV charging stations, and smart meters across borders

Telecommunications 🇧🇪 Kontich 1,071 2000
70
RIZIV-INAMIriziv.be

An institute providing health and disability insurance in Belgium, ensuring coverage and support for individuals facing medical and physical challenges

Government Administration 🇧🇪 Saint-Josse-ten-Noode 1,035 1963
71
Aquafinaquafin.be

Specializing in wastewater treatment infrastructure in Flanders, collecting and treating household wastewater to meet European and Flemish standards, contributing to a cleaner environment

Environmental Services 🇧🇪 Aartselaar 1,024 1990
72
Belfius Insurancebelfius.be

Offering life and non-life insurance products through multiple brands to individuals, professionals, companies, social organizations, and governments in Belgium and Luxembourg.

Insurance 🇧🇪 Saint-Josse-ten-Noode 1,023 2012
73
Centre Hospitalier EpiCURAepicura.be

Regional hospital network with three hospitals and five polyclinics offering quality medical care, advanced technology, and diverse healthcare services.

Hospitals and Health Care 🇧🇪 Baudour 999 n/a
74
Euronavcmb.tech

Operates a global fleet of dry bulk, crude oil, chemical, container, offshore wind, and port vessels with hydrogen fuel offerings.

Maritime Transportation 🇧🇪 Antwerp 982 1989
75
Lineaslineas.net

A company focused on shifting freight transport from road to rail in Europe, offering superior rail solutions to optimize supply chains and reduce environmental impact

Transportation, Logistics, Supply Chain and Storage 🇧🇪 Schaerbeek 979 n/a
76
GZA Ziekenhuizengzaziekenhuizen.be

Announcement of merger between two hospitals, directing followers to a new LinkedIn account for future updates and news.

Hospitals and Health Care 🇧🇪 Wilrijk 972 n/a
77
Helan. Helemaal welzijn.helan.be

A well-being group providing efficient healthcare services, insurance, home care, childcare, and more with a focus on employee empowerment and unique approach to work

Health and Human Services 🇧🇪 Wilrijk 961 n/a
78
AZORGazorg.be

Provides specialized, complex medical care across six campuses, focusing on innovation, employee development, and patient-centered outcomes.

Hospitals and Health Care 🇧🇪 958 2025
79
Jessa ziekenhuisjessazh.be

A leading Flemish hospital providing top clinical medicine and high-quality patient care with extensive medical services, cutting-edge technology, and affordable healthcare

Hospitals and Health Care 🇧🇪 Hasselt 953 n/a
80
Sibelgasibelga.be

The company operates as a distribution network operator for electricity and natural gas in the Brussels region, managing distribution networks

Utilities 🇧🇪 Brussels 944 2003
81
bpost banque / bpost bankbpostbanque.be

A Belgian bank offering a range of simple, secure, and accessible banking services, including mortgages, through a unique partnership model

Banking 🇧🇪 Bruxelles-Brussel 942 1995
82
Clinique saint pierrecspo.be

Providing quality hospital care with ongoing infrastructure improvements, patient support, and a focus on comfort during hospital stays.

Hospitals and Health Care 🇧🇪 Ottignies 923 n/a
83
AZ Turnhoutazturnhout.be

Healthcare organization providing top-quality care with a welcoming approach, offering career advancement, work-life balance, and employee benefits to motivated individuals Apply now!

Hospitals and Health Care 🇧🇪 Turnhout 913 2009
84
BICSbics.com

Connecting communities and creating opportunities through global voice, messaging, IoT, roaming, and cloud communications to empower societies and businesses

Telecommunications 🇧🇪 Brussels 893 1996
85
CMB.TECHcmb.tech

Global maritime shipping company. Owns and operates a large diversified fleet. Also provides hydrogen and ammonia fuel to customers, through production or third-party sourcing.

Maritime Transportation 🇧🇪 Antwerp 890 2006
86
Veolia | Belgium & Luxembourgveolia.be

Leading provider in Belgium and Luxembourg offering integrated solutions for water, waste, and energy management, aiming to reduce environmental impact and accelerate ecological transition

Environmental Services 🇧🇪 Brussels 885 1968
87
AZ Klinaazklina.be

Leading hospital in the North Antwerp region, providing high-quality, patient-centered healthcare with modern infrastructure, advanced technologies, and a wide range of medical specialties across 3 campuses

Hospitals and Health Care 🇧🇪 Brasschaat 883 1988
88
Cliniques de l'Europe / Europa Ziekenhuizencliniquesdeleurope.be

Provides comprehensive healthcare services with advanced medical technology, ensuring high-quality, personalized care for patients in a modern hospital environment.

Hospitals and Health Care 🇧🇪 Brussels 854 n/a
89
De Watergroepdewatergroep.be

The largest water supplier in Flanders, delivering water to 29 million customers in 175 municipalities, and involved in sewage networks and industrial water projects

Utilities 🇧🇪 Brussels 853 1913
90
Institut Jules Bordetbordet.be

Specialized hospital providing advanced cancer diagnosis, treatment, research, and high-level university education focused on all cancer types.

Hospitals and Health Care 🇧🇪 Anderlecht 851 n/a
91
Solidaris Walloniesolidaris.be

Health access for all in Belgium through managing health insurance Providing support for 3 million affiliates with 10,000 staff committed to their needs

Hospitals and Health Care 🇧🇪 Brussels 829 n/a
92
Centre Hospitalier Régional Sambre et Meuse (CHRSM)chrsm.be

A major regional hospital group with two sites providing high-quality healthcare, with over 700 beds and 3,000+ staff offering a wide range of medical services

Hospitals and Health Care 🇧🇪 Namur 822 2012
93
MUMCmumc.nl

The company focuses on the importance of functional preservation in cancer treatment, featuring insights from patients and experts

Hospitals and Health Care 🇧🇪 HX Maastricht 819 n/a
94
Centre Hospitalier de Wallonie picardechwapi.be

A major healthcare institution in Wallonia with three hospital sites and a clinic, focusing on patient well-being and optimal care

Hospitals and Health Care 🇧🇪 Tournai 813 n/a
95
Delen Private Bankdelen.bank

Financial and legal guidance for family assets through personal relationship managers, sustainable investment strategies, digital banking channels, and comprehensive long-term future estate planning.

Investment Management 🇧🇪 Antwerp 804 1936
96
Groupe Jolimontjolimont.be

A healthcare group in Wallonia and Hainaut with over 5,500 employees, providing hospital and outpatient care, childcare, elderly care, and support services

Hospitals and Health Care 🇧🇪 La Louvière 796 n/a
97
Imeldaziekenhuis Bonheidenimelda.be

A general hospital providing quality care with 1400 employees and 150 doctors in a peaceful forest setting, emphasizing compassion and innovation

Hospitals and Health Care 🇧🇪 Bonheiden 796 1961
98
Hôpitaux Iris Sud - Iris Ziekenhuizen Zuidhis-izz.be

Multisite hospital network in Brussels providing comprehensive, multidisciplinary medical care with patient-centered approach, employing over 2,000 healthcare professionals.

Hospitals and Health Care 🇧🇪 Etterbeek 780 n/a
99
Clinic Saint-Jean Brusselsclstjean.be

A large private hospital in Brussels with a staff of 1800 providing specialized care in ambulatory and hospital settings, placing patient care at the forefront

Hospitals and Health Care 🇧🇪 Brussels 777 1500
100
BNP Paribas Factoringbnpparibas.com

Factoring services across 15 countries, offering tailored domestic and international solutions with harmonized contracts and single contact point.

Financial Services 🇧🇪 Brussels 774 n/a

Turn this list into pipeline

Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.

Build your own list, free

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.

More company lists in Belgium

The same list elsewhere in Belgium