The professional services firms in Wallonia mostly provide IT services and consulting, engineering, and international development advice. They range from large groups to mid-sized firms, with a notable presence of companies founded in the late 1980s and early 1990s.
Key players include NRB and NSI, both offering comprehensive ICT solutions. ADE - Evidence for Better Policy specializes in policy design and evaluation for international institutions, while Group-IPS and De Smet Engineers & Contractors focus on engineering and project management for industrial sectors. A significant number of these firms are headquartered in the Liège region.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 13,672 | ||||
| 2 | 1,357 | ||||
| 3 |
NSIgroupensi.com
Providing integrated IT solutions and high-value services including enterprise architecture, ERP, AI, mobile, e-commerce, and infrastructure management for businesses. |
1,172 | |||
| 4 |
ADE - Evidence for Better Policyade.eu
Consultancy providing independent advice for international institutions and public organizations in policy design, implementation, and evaluation across various thematic areas |
1,123 | |||
| 5 |
Group-IPSgroup-ips.com
Expert project management and engineering services supporting industrial projects across multiple sectors to streamline success and improve operational efficiency worldwide. |
391 | |||
| 6 |
De Smet Engineers & Contractors (DSEC)dsengineers.com
Global provider of Engineering and Turn Key projects for various industries including bio-based chemicals, energy efficiency, sugars, oils, agro-nutrients, with a focus on sustainability |
348 | |||
| 7 | 345 | ||||
| 8 |
IGRETECigretec.com
IGRETEC specializes in providing a diverse range of services including urban planning, economic development, water and energy management, and participatory project methodologies |
284 | |||
| 9 |
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 | |||
| 10 |
GDTech Groupgdtech-group.com
Integrated service provider for product development, specializing in design, numerical analysis, validation, and manufacturing across various industries with a focus on quality and flexibility |
207 | |||
| 11 |
Wavenet Belgiumwavenet.be
Providing IT consulting, custom software development, maintenance, support, and training with expertise in web, telecom, business intelligence, and big data solutions. |
204 | |||
| 12 |
Fiduciaire²fiduciaire2.be
Dynamic team providing efficient assistance and tailored advice in accounting, finance, taxation, and business creation/cessation for individuals, corporations, and non-profit organizations Collaborates with experts in various fields |
183 | |||
| 13 |
Cenaerocenaero.be
A private non-profit research center providing numerical simulation methods and tools for innovation in various industries, high performance computing, and software solutions |
89 | |||
| 14 |
ETREAC AGENCYetreac.com
A boutique agency offering a range of services including training, coaching, event management, luxury product sales, and venue rentals in Belgium and Luxembourg |
88 | |||
| 15 |
UGARITugarit.tech
A software development company with expertise in networking and security solutions, creating tailored architectures for optimal performance and protection |
56 | |||
| 16 |
ARGAFINargafin.com
Financial management consulting firm specializing in assisting SMEs and start-ups with development, optimization, profitability, and implementing financial performance monitoring tools |
41 | |||
| 17 |
Myrmidonsmyrmidons.net
Offering top-tier IT services through a unique approach focusing on coaching and facilitation, rather than just providing human resources, to make team members shine |
37 | |||
| 18 | 31 | ||||
| 19 |
Quimesis Engineering your ideasquimesis.be
Quimesis specializes in helping customers bring their innovative ideas to life by providing support in feasibility studies, prototyping, validation, and production of technological products |
31 | |||
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. | |||||
| 20 |
Naliosnalios.com
We support SMEs in saving time and generating growth with Odoo, a powerful and intuitive integrated business management software Operating in Belgium, Switzerland, and France with a vision to become the European leader in Odoo integration Also, offering free, French-language Odoo training through our academy and providing additional resources via our YouTube channel |
30 | |||
| 21 |
DVC-COdvc-co.com
A company founded in 1987 providing unique solutions through feasibility studies, product design, programming, certification, industrialization, and production for clients in Europe |
24 | |||
| 22 |
Mielabelomielabelo.be
Operational consulting focused on enhancing organizational agility and performance through governance, information security, operational excellence, and quality management. |
23 | |||
| 23 |
fullteamfullteam.eu
An advertising agency founded in 1987, offering graphic design, pre-press, video, and multimedia solutions with a focus on creativity, reactivity, and success |
22 | |||
| 24 |
Verstichel et Experts Associésimmoexp.be
A team of 14 claims specialists for insurance companies across various fields in Belgium, along with 3 private detectives specializing in insurance fraud investigations |
20 | |||
| 25 |
TETRADE Consultingtetrade.be
A consulting firm specializing in ERP systems and digital technology for utilities and manufacturing companies, focusing on process optimization and IT system support |
19 | |||
| 26 | 19 | ||||
| 27 |
Ingenumingenum.be
Ingenum is a Belgian consulting firm specialized in software development, offering analysis, advice, and implementation of web, mobile, and desktop applications |
16 | |||
| 28 |
Sapristicsapristic.com
Specializing in healthcare digital transformation, our company integrates EPR solutions, provides SAP consulting services, and develops customized solutions for data migration and system interfacing |
16 | |||
| 29 |
De Roo & Partners Expertises by Studiboderooexpertises.be
An expertise bureau founded in 1996, now known as De Roo & Partners, specializing in assessments for insurance companies in Belgium |
16 | |||
| 30 |
Alterius - Recouvrement de créancesalterius.be
Specialized association of Judicial Officers focusing on amicable and judicial debt collection, offering efficient services through continuous missions from amicable to judicial phases |
15 | |||
| 31 | 15 | ||||
| 32 |
Incidenceincidence.be
A market research consultancy providing tailored solutions for small to medium businesses in various sectors, offering operational insights typically reserved for larger corporations |
12 | |||
| 33 |
IntPactintpact.com
IntPact assists industrial companies in detecting threats and opportunities, providing targeted insights for less risky decision-making and enhancing intelligence capabilities through tailored solutions |
11 | |||
| 34 | 6 | ||||
| 35 |
CAPTAIN AI ACADEMYcaptainai.ai
A leader in AI education for businesses, providing conferences, training, consultancy services, and custom AI solutions to drive digital transformation and innovation |
5 | |||
| 36 |
Creaction INT
A consulting firm specializing in technology transfer, innovation management, project support, and workshops for developing and qualifying innovative solutions |
5 | |||
| 37 |
CTI Consultingcticonsulting.be
A multidisciplinary team of consultants helping organizations strategically leverage digital opportunities through digital transformation, legal tech compliance, information security, and training |
5 | |||
| 38 |
dantes - ImPertinent Businessdantes.pro
This company aligns business goals with team members' personal aspirations, focusing on core competencies to drive motivation, ambition, autonomy, and career fulfillment |
3 | |||
| 39 |
PROJECTIFprojectif.be
The company offers tailored coaching and facilitation services in team management, lean management, family business governance, and business succession planning |
2 | |||
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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 11, 2026.
More company lists in Wallonia
- The largest companies in Wallonia 1,106
- Multinational companies in Wallonia 234
- Companies with in-house R&D in Wallonia 155
- Manufacturers in Wallonia 151
- Retail chains in Wallonia 110
- Family-owned companies in Wallonia 82
- Hardware manufacturers in Wallonia 75
- Food and Beverage Manufacturing companies in Wallonia 75
- IT Services and IT Consulting companies in Wallonia 67
- IT services companies in Wallonia 67
- Critical infrastructure operators in Wallonia 65
- Consumer goods companies in Wallonia 59
- Software Development companies in Wallonia 58
- Transportation, Logistics, Supply Chain and Storage companies in Wallonia 57
- SaaS companies in Wallonia 54
- Retail companies in Wallonia 52
- Contract manufacturers in Wallonia 51
- Chemical companies in Wallonia 45
- Pharmaceutical companies in Wallonia 45
- Aerospace and defence companies in Wallonia 44
- Education providers in Wallonia 43
- Financial services firms in Wallonia 41
- Distributors and wholesalers in Wallonia 39
- Food and beverage companies in Wallonia 38