These are large and mid-sized Belgian companies primarily in IT services and consulting, with a focus on cybersecurity solutions. Firms like Cegeka, with over 5,000 employees, provide IT solutions, while NATO Communications and Information Agency (NCIA) safeguards networks. Intigriti empowers organizations to fix vulnerabilities, and NVISO Security offers cybersecurity services. The list shows a strong concentration of companies in the IT sector.
Many of these companies, such as NRB and Easi, offer a broad range of IT services including software development, infrastructure, and cloud solutions, often with an integrated cybersecurity component. A significant number of headquarters are located in Brussels, indicating a central hub for these IT and cybersecurity firms in Belgium. The companies also frequently serve a wide range of sectors and clients, from large enterprises to mid-market businesses.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Cegekacegeka.com
A family-owned IT solutions provider focused on creating personalized customer experiences, aiming to become the leading European orchestrator of digital business platforms |
5,167 | |||
| 2 |
NATO Communications and Information Agency (NCIA)nato.int
NATO's technology and cyber experts with a team of 3,000 members across Europe and North America, safeguarding networks and providing critical capabilities to preserve peace and security |
2,545 | |||
| 3 | 1,646 | ||||
| 4 | 1,357 | ||||
| 5 |
Intigritiintigriti.com
Empowering large organizations to find and fix vulnerabilities using a platform and global security researchers, preventing costly breaches through various security solutions. |
782 | |||
| 6 | 709 | ||||
| 7 |
Telenet Businesswww2.telenet.be
Telenet Business provides Belgian entrepreneurs with digital solutions including connectivity, network, security, and IT services, ensuring a smooth digital flow for businesses of all sizes |
656 | |||
| 8 |
AXI IT Servicesaxi.be
Innovative software and IT solutions provider for various industries, helping clients succeed and achieve their vision with offices in Netherlands and Belgium |
497 | |||
| 9 |
Proximus NXTproximusnxt.be
Support medium and large companies with digital transformation through cloud, data management, AI, cybersecurity, and strategic technology partnerships. |
479 | |||
| 10 |
Lansweeperlansweeper.com
Provides a centralized platform for managing IT assets, enhancing visibility, automating tasks, and supporting cybersecurity through comprehensive asset discovery and management. |
422 | |||
| 11 |
Yumaweareyuma.com
A BeNeLux digital transformation group focusing on combining human and digital transformation, with expertise from various companies within the group |
383 | |||
| 12 |
NVISO Securitynviso.eu
Provides cyber security services using skilled professionals, preventing and detecting security challenges for clients with positive business outcomes. |
348 | |||
| 13 |
Trustteam België / Belgiquetrustteam.eu
Leading provider of IT managed services offering cloud, infrastructure, networking, security, software, VoIP, and support solutions with multiple certified data centers |
275 | |||
| 14 |
Aikido Securityaikido.dev
Automated platform for secure code, cloud, and runtime environments with AI-driven vulnerability detection and remediation for engineering teams. |
249 | |||
| 15 |
NRB International Organisations (TRASYS)trasysinternational.com
Specialized ICT provider offering IT solutions and consulting for International Public and Corporate Organizations, focusing on compliance, digital transformation, and efficiency |
244 | |||
| 16 |
RHEA Grouprheagroup.com
Engineering solutions, system development and cybersecurity services for space, government and defense organizations across Europe and North America through diverse mission support programs. |
239 | |||
| 17 |
VanRoeyvanroey.be
IT-services provider specializing in digitalization through automation, software, services, and Hybrid-IT infrastructure, prioritizing security and data protection for companies' digital transformation |
228 | |||
| 18 |
ConXioNconxion.be
A Flemish ICT service provider offering hardware, infrastructure, security, and software solutions to SMEs, Midrange, and Enterprise segments with strong partnerships and innovative Experience Center |
195 | |||
| 19 |
Guardsquareguardsquare.com
A leading provider of mobile application security solutions, offering a comprehensive approach to protecting apps through code hardening and real-time threat visibility |
180 | |||
| 20 |
Cegeka Belgium (CTG)cegeka.com
CTG accelerates digital transformation by providing innovative solutions and services to achieve business and IT outcomes with agility and confidence |
117 | |||
| 21 |
itsme®itsme-id.com
A secure identity solution offering a unique combination of four different services, focused on building trust and security for users |
116 | |||
| 22 |
Proximus Adaproximus-ada.com
A Belgian Center of Excellence focusing on artificial intelligence and cybersecurity to address challenges and become a European reference in these fields |
112 | |||
| 23 | 91 | ||||
| 24 |
Approach Cyberapproach-cyber.com
Supports organizations with cyber resilience solutions. Combines strategic advice, offensive/defensive expertise, SOC operations, and managed security platform for digital peace of mind. |
82 | |||
| 25 |
Phishedphished.io
Offers AI-powered cybersecurity training, personalized phishing simulations, and threat intelligence to reduce human error and improve organizational security posture. |
81 | |||
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 |
Toreontoreon.com
Independent consultants providing information security advice to help organizations safely leverage technology, make informed decisions, and achieve digital goals with confidence and trust. |
69 | |||
| 27 |
Leonardo Belgiumtaleez.com
A subsidiary specializing in aerospace, defense, and security with divisions in helicopters, aircraft, electronics, aerostructures, and cybersecurity, offering maintenance, material services, and innovative cybersecurity solutions |
59 | |||
| 28 |
Deutsche Telekom Global Business Solutions Belgium NV/SAtelekom.com
Provider of network and ICT security services to international public sector organizations and global players in automotive, FMCG, and manufacturing industries |
40 | |||
| 29 |
SecWisesecwise.be
Provide expert services, guidance in security, and compliance for cloud and mobile-first environments, developing mature cybersecurity strategies and architectures. |
39 | |||
| 30 |
CERT-EUcert.europa.eu
This company contributes to the security of the ICT infrastructure of EU institutions, offering support in preventing, detecting, and responding to cyber-attacks |
39 | |||
| 31 |
Infinigate Belgiuminfinigate.com
Value-add distributor of leading-edge cybersecurity solutions across EMEA, with dedicated technical experts providing secure network and cloud protection for SMBs and enterprises |
39 | |||
| 32 |
axl & traxaxl-trax.com
Specializes in providing security solutions for well-managed organizations utilizing SAP systems, offering expertise tailored to enhance protection and minimize vulnerabilities |
37 | |||
| 33 | 35 | ||||
| 34 |
Hex-Rayshex-rays.com
An independent company developing cutting-edge software analysis solutions, specializing in reverse-engineering, hostile code analysis, and vulnerability research for digital security |
35 | |||
| 35 |
Interligointerligo.be
This company specializes in personalized network solutions to help businesses achieve their goals within budget, focusing on security, user access, collaboration, and more |
34 | |||
| 36 |
Sertalinksertalink.com
Specialized in cutting-edge security solutions including identity and access management, data governance, data loss prevention, and remote access session monitoring for IT infrastructures |
32 | |||
| 37 |
The Collective Consultingthecollective.eu
A highly-skilled Microsoft Gold Partner specializing in security, compliance, endpoint management, messaging, Microsoft Teams voice, and meetings Employs certified professionals for quality services |
32 | |||
| 38 |
Exclusive Networks - Belgiumlinktr.ee
Global cybersecurity specialist providing partners and customers unique service portfolios, technical know-how, managed security, and training through a curated leading vendor network worldwide. |
31 | |||
| 39 |
MTELECOMmtelecom.co.uk
A consultancy firm specializing in cybersecurity solutions and services, helping businesses protect their digital assets from cyber threats and attacks |
25 | |||
| 40 |
Resilient Securityresilientsecurity.be
Specializing in cyber security, we work to ensure every business is protected against threats and risks in the digital landscape |
24 | |||
| 41 |
Nomios Belgiumnomios.be
This company develops secure and connected digital solutions and services, managing infrastructure and providing innovative security and network solutions for businesses |
22 | |||
| 42 |
AXS Guardaxsguard.com
Belgian Cybersecurity specialist providing secure network connections, protection against cyber threats, VPN services, compliance monitoring, and managed security solutions for enterprises |
22 | |||
| 43 |
SHIELD vzwshield-vzw.be
Shield offers proactive IT expertise in cybersecurity, collaborating with healthcare and educational institutions to develop solutions against cyberthreats |
21 | |||
| 44 | 21 | ||||
| 45 |
ActWiseactwise.eu
Specializing in identity security, ActWise helps companies protect against cyber threats with a privilege-centric approach, defending what matters most |
21 | |||
| 46 |
Siltasilta-ict.be
Specializing in designing, implementing, and managing advanced network infrastructures, focusing on custom solutions that seamlessly integrate with business objectives Also offering scalable cloud solutions |
20 | |||
| 47 | 19 | ||||
| 48 |
Hybrid Corehybridcore.eu
Hybrid Core specializes in guiding organizations through challenging and risky operating environments to ensure success |
18 | |||
| 49 |
Engineering International Belgiumeng.it
An IT consultancy company specializing in serving EU bodies, delivering innovative solutions, and assigning specialists to key IT framework contracts at the European Commission |
16 | |||
| 50 |
Barbariansbarbarians.io
Provides cloud-first, managed SIEM system with integrated AI for enterprise security incident monitoring, alerting & reporting, deployed on AWS, Azure, or Google Cloud |
16 | |||
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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 12, 2026.
More company lists in Belgium
- The largest companies in Belgium 6,987
- Multinational companies in Belgium 1,745
- Manufacturers in Belgium 630
- Retail chains in Belgium 622
- Companies with in-house R&D in Belgium 605
- IT services companies in Belgium 551
- IT Services and IT Consulting companies in Belgium 542
- Family-owned companies in Belgium 435
- Software Development companies in Belgium 430
- Transportation, Logistics, Supply Chain and Storage companies in Belgium 409
- SaaS companies in Belgium 407
- Professional services firms in Belgium 396
- Critical infrastructure operators in Belgium 354
- Hardware manufacturers in Belgium 320
- Financial services firms in Belgium 314
- Distributors and wholesalers in Belgium 314
- Consulting firms in Belgium 285
- Retail companies in Belgium 285
- Food and Beverage Manufacturing companies in Belgium 282
- Truck Transportation companies in Belgium 259
- Logistics companies in Belgium 258
- Advertising Services companies in Belgium 222
- Education providers in Belgium 209
- Consumer goods companies in Belgium 205