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The 38 largest critical infrastructure operators in Overijssel

Tamtam tracks 38 critical infrastructure operators headquartered in Overijssel. This list ranks all of them by number of employees on LinkedIn, led by Medisch Spectrum Twente, ZGT and Vitens. Their median headcount is 659. Half of them were founded in 1993 or later. The most common headquarters are Almelo (5) and Oldenzaal (3).

馃嚦馃嚤 Overijssel38 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
Medisch Spectrum Twentemst.nl

A top clinical hospital in Twente offering a wide range of healthcare services, medical education, research, trauma care, and collaboration within a network of hospitals

Hospitals and Health Care 馃嚦馃嚤 Enschede 2,709 n/a
2
ZGTzgt.nl

A leading hospital in Twente providing high-quality, personalized care to 250,000 patients annually, prioritizing quality, safety, education, and research Visit our website for more information

Hospitals and Health Care 馃嚦馃嚤 Almelo 2,434 n/a
3
Vitensvitens.nl

Leading Dutch water company providing top-quality drinking water to over 59 million people and businesses across several provinces, with a large infrastructure and annual turnover

Utilities 馃嚦馃嚤 Zwolle 1,934 2006
4
Deventer Ziekenhuisdz.nl

Regional hospital offering a wide range of medical specialties, high-quality care, diagnostic services, and training programs with main location in Deventer, Netherlands

Hospitals and Health Care 馃嚦馃嚤 Deventer 1,922 1472
5
Carintreggelandcarintreggeland.nl

An innovative organization in Twente providing a wide range of services in healthcare, well-being, and living to empower individuals to enhance their quality of life

Hospitals and Health Care 馃嚦馃嚤 Hengelo 1,793 n/a
6
Carinovawerkenbijcarinova.nl

Carinova is an innovative healthcare organization providing services in Home Care, Residential Care, and Household Help in Southwestern and Northern Overijssel

Hospitals and Health Care 馃嚦馃嚤 Deventer 1,367 2003
7
Dimencedimence.nl

Dimence provides mental health care in East Netherlands, serving 30,000 clients annually with a focus on development, progress, and recovery in a welcoming and results-oriented environment

Mental Health Care 馃嚦馃嚤 Deventer 1,312 2008
8
TSN Zorgtsnzorg.nl

TSN provides trustworthy home care services, assisting with household tasks, daily routines, and medical care to help individuals live independently at home

Hospitals and Health Care 馃嚦馃嚤 Zwolle 1,252 n/a
9
De Twentse Zorgcentradetwentsezorgcentra.nl

The organization provides care and support to around 1500 individuals with intellectual disabilities, offering lifelong and comprehensive services through 2200 employees and 500 volunteers

Hospitals and Health Care 馃嚦馃嚤 Enschede 1,252 2001
10
Tactus Verslavingszorgtactus.nl

A specialist in addiction care, offering tailored support for young people and adults struggling with addiction and other challenges, across multiple locations in the Netherlands

Mental Health Care 馃嚦馃嚤 Deventer 1,245 1900
11
Saxenburghsaxenburgh.nl

Saxenburgh provides medical, rehabilitation, and elderly care with a focus on a good quality of life, personalized support, and building for the future

Hospitals and Health Care 馃嚦馃嚤 Hardenberg 1,101 n/a
12
IJsselheemijsselheem.nl

Specializing in elderly care, offering various housing, care, and services in multiple locations Provides hospital-related care and home care services

Hospitals and Health Care 馃嚦馃嚤 Kampen 1,018 n/a
13
TriviumMeulenbeltZorgtriviummeulenbeltzorg.nl

A team of 2600+ staff and 1600 volunteers provide personalized care for the elderly and chronically ill in modern facilities and homes

Hospitals and Health Care 馃嚦馃嚤 Almelo 876 n/a
14
RIBW Overijsselribwoverijssel.nl

RIBW Overijssel provides reliable support for individuals with mental health challenges in areas of housing, employment, and well-being across Overijssel, Netherlands

Mental Health Care 馃嚦馃嚤 Zwolle 781 n/a
15
Frionfrionzorg.nl

Frion supports individuals with intellectual disabilities at all stages of life, focusing on personalized development and leveraging expertise and network connections for client benefit

Hospitals and Health Care 馃嚦馃嚤 Zwolle 693 n/a
16
Dimence Groepwerkenbijdimencegroep.nl

The organization provides mental health care, wellbeing, and social services close to clients, focusing on increasing mental resilience with a human-centered approach

Mental Health Care 馃嚦馃嚤 Deventer 686 2014
17
Zonnehuisgroep IJssel-Vechtvereen.nu

Zonnehuisgroep IJssel-Vecht offers high-quality care for seniors, including nursing home, home care, and day services, with a focus on individual well-being and unique needs

Hospitals and Health Care 馃嚦馃嚤 Zwolle 675 1972
18
Waterschap Drents Overijsselse Deltawdodelta.nl

Ensure safe living, sufficient water for farmers and businesses, and clean water in urban areas and nature; that's what this company's waterschap takes care of

Civic and Social Organizations 馃嚦馃嚤 Zwolle 670 2016
19
Baalderborgbaalderborggroep.nl

This company provides compassionate care and support for individuals with intellectual disabilities, children with developmental issues, and elderly with intensive support needs

Hospitals and Health Care 馃嚦馃嚤 Ommen 659 1993
20
Waterschap Vechtstromenvechtstromen.nl

Aiming for clean, safe, and sufficient water for people, plants, and animals, the company manages water resources sustainably across several regions

Government Administration 馃嚦馃嚤 Almelo 590 2014
21
Keolis Nederlandkeolis.nl

A public transportation company in the Netherlands providing bus and train services in various regions, focusing on safety, comfort, and innovation

Individual and Family Services 馃嚦馃嚤 Deventer 573 1999
22
ENGIE Energie Nederland NVengie.nl

Leading energy company in the Netherlands, driving sustainable change with innovative solutions, green energy generation, technical services, and integrated sustainable development projects

Renewable Energy Power Generation 馃嚦馃嚤 Zwolle 560 2016
23
Siers Groep Oldenzaal B.V.siersgroep.nl

A family-owned organization offering a wide range of projects, from leidingbouw and telecom to installatietechniek and technical advisory services

Civil Engineering 馃嚦馃嚤 Oldenzaal 560 1964
24
Heisterkamp Transportation Solutionsheisterkamp.eu

A comprehensive transport solution provider with services including truck and trailer rental, service, breakdown assistance, and sales of used vehicles

Truck Transportation 馃嚦馃嚤 Oldenzaal 393 1919
25
Cogascogas.nl

Cogas is a regional network company focusing on developing, installing, and managing gas, electricity, and heat networks, contributing to a sustainable energy transition through innovation and partnerships

Utilities 馃嚦馃嚤 Almelo 271 1966
26
NV ROVA Holdingrova.nl

ROVA is a public service provider in waste management, public space maintenance, and sustainable energy for approximately 900,000 residents in 3 regions

Environmental Services 馃嚦馃嚤 Zwolle 250 1996
27
Tielbeke Logistiektielbeke.nl

Provides integrated transport, distribution, and warehousing services with focus on flexibility, efficiency, and sustainable logistics solutions for clients.

Transportation, Logistics, Supply Chain and Storage 馃嚦馃嚤 Lemelerveld 219 1958
28
Salland Zorgverzekeraarsalland.nl

Established in 1860, this company has a strong focus on people's health, offering insurance and healthcare services to contribute to affordable healthcare

Insurance Carriers 馃嚦馃嚤 Deventer 217 1860
29
HST Groephst.nl

Allround logistics service provider offering total logistic solutions including international transport, warehousing, sea and air freight, and value added logistics

Truck Transportation 馃嚦馃嚤 Enschede 184 1978
30
Twente Milieutwentemilieu.nl

A team of 400 dedicated individuals working together to maintain a clean, green, and livable Twente region through waste collection and public space maintenance

Environmental Services 馃嚦馃嚤 Enschede 167 n/a
31
Vos Transport Groupvostransportgroup.com

Specialist in sustainable transport, distribution, and warehousing with multiple locations, serving renowned clients with certified, award-winning expertise.

Truck Transportation 馃嚦馃嚤 Deventer 140 1947
32
MSGmsg.eu

Providing sustainable and inclusive post, parcel, and logistics solutions with a focus on efficiency and social responsibility Embracing eco-friendly deliveries in the Netherlands

Postal Services 馃嚦馃嚤 Enschede 101 1993
33
Stichting Ziekenhuisgroep Twentezgt.nl

A hospital & health care company in Almelo, Netherlands, focusing on providing medical services to the community

Hospitals and Health Care 馃嚦馃嚤 Almelo 92 n/a
34
Brinks Transport Rijssen B.V.werkenbijbrinks.nl

A logistics service provider offering tailored solutions in transport, distribution, warehousing, and moving services for businesses and individuals, with a focus on storage and delivery

Transportation, Logistics, Supply Chain and Storage 馃嚦馃嚤 Rijssen 79 1862
35
Fellinger Internationaal Transportfellingertransport.eu

Transport refrigerated and frozen goods from Kampen to major European cities, serving over 1200 customers weekly across Europe.

Truck Transportation 馃嚦馃嚤 Kampen 17 1981
36
Mach Transport & Logistiek B.V.machtransport.nl

A medium-sized innovative transport and logistics company in Twente, providing logistics services in the Benelux region in a socially responsible manner

Transportation, Logistics, Supply Chain and Storage 馃嚦馃嚤 Oldenzaal 16 2012
37
Noordendorp Transportnoordendorp.nl

A dynamic company based in Haaksbergen specializing in transport, storage, and logistics, offering fast and professional delivery solutions 24/7

Transportation, Logistics, Supply Chain and Storage 馃嚦馃嚤 Haaksbergen 13 1914
38
HPL Logisticshpllogistics.nl

Comprehensive logistics services including road, air, sea, rail transport, warehousing, and value-added activities ensuring efficient product flow.

Transportation, Logistics, Supply Chain and Storage 馃嚦馃嚤 Losser 6 2020

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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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