# Top 39 professional services firms in Wallonia Tamtam tracks 39 professional services firms headquartered in Wallonia. This list ranks all of them by number of employees on LinkedIn, led by freelance, NRB and NSI. Their median headcount is 30. Half of them were founded in 2004 or later. The most common headquarters are LiΓ¨ge (4), Namur (3) and Nivelles (3). 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 LiΓ¨ge region. πŸ‡§πŸ‡ͺ Wallonia Β· 39 companies Β· Updated Nov 11, 2026 | # | Company | Industry | Headquarters | Employees | Founded | |---|---|---|---|---|---| | 1 | [freelance](https://www.tamtam.ai/c/freelance-chaumont-gistoux) (s11.be)
Specializing in customized ICT solutions, S11 provides managed infrastructure services, consultancy, and skilled consultants for long-term client relationships | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Chaumont-Gistoux | 13,672 | | | 2 | [NRB](https://www.tamtam.ai/c/nrb) (keyes.eu)
A leading ICT provider in Belgium, offering consultancy, software, infrastructure, cloud services, and staffing solutions across various sectors with state-of-the-art datacenters | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ LiΓ¨ge | 1,357 | 1987 | | 3 | [NSI](https://www.tamtam.ai/c/nsi-awans) (groupensi.com)
Providing integrated IT solutions and high-value services including enterprise architecture, ERP, AI, mobile, e-commerce, and infrastructure management for businesses. | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Awans | 1,172 | 1993 | | 4 | [ADE - Evidence for Better Policy](https://www.tamtam.ai/c/ade-evidence-for-better-policy) (ade.eu)
Consultancy providing independent advice for international institutions and public organizations in policy design, implementation, and evaluation across various thematic areas | International Trade and Development | πŸ‡§πŸ‡ͺ Louvain-la-Neuve | 1,123 | 1990 | | 5 | [Group-IPS](https://www.tamtam.ai/c/group-ips) (group-ips.com)
Expert project management and engineering services supporting industrial projects across multiple sectors to streamline success and improve operational efficiency worldwide. | Engineering Services | πŸ‡§πŸ‡ͺ Nivelles | 391 | 1992 | | 6 | [De Smet Engineers & Contractors (DSEC)](https://www.tamtam.ai/c/de-smet-engineers-and-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 | Engineering Services | πŸ‡§πŸ‡ͺ Mont-Saint-Guibert | 348 | 1989 | | 7 | [G-TEC](https://www.tamtam.ai/c/g-tec) (g-tec.eu)
Specializing in marine and land geophysical surveys, with expertise in GIS, we provide data-driven insights for offshore energy, coastal development, and infrastructure projects | Civil Engineering | πŸ‡§πŸ‡ͺ Milmort | 345 | 1993 | | 8 | [IGRETEC](https://www.tamtam.ai/c/igretec) (igretec.com)
IGRETEC specializes in providing a diverse range of services including urban planning, economic development, water and energy management, and participatory project methodologies | Government Administration | πŸ‡§πŸ‡ͺ Charleroi | 284 | 1946 | | 9 | [NRB International Organisations (TRASYS)](https://www.tamtam.ai/c/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 | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Herstal | 244 | 2017 | | 10 | [GDTech Group](https://www.tamtam.ai/c/gdtech-group) (gdtech-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 | Engineering Services | πŸ‡§πŸ‡ͺ LiΓ¨ge | 207 | 1998 | | 11 | [Wavenet Belgium](https://www.tamtam.ai/c/wavenet-belgium) (wavenet.be)
Providing IT consulting, custom software development, maintenance, support, and training with expertise in web, telecom, business intelligence, and big data solutions. | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Leuze-en-Hainaut | 204 | 1999 | | 12 | [FiduciaireΒ²](https://www.tamtam.ai/c/fiduciaire) (fiduciaire2.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 | Accounting | πŸ‡§πŸ‡ͺ Beaufays | 183 | 2017 | | 13 | [Cenaero](https://www.tamtam.ai/c/cenaero) (cenaero.be)
A private non-profit research center providing numerical simulation methods and tools for innovation in various industries, high performance computing, and software solutions | Research Services | πŸ‡§πŸ‡ͺ Gosselies | 89 | 2002 | | 14 | [ETREAC AGENCY](https://www.tamtam.ai/c/etreac-agency) (etreac.com)
A boutique agency offering a range of services including training, coaching, event management, luxury product sales, and venue rentals in Belgium and Luxembourg | Personal Care Product Manufacturing | πŸ‡§πŸ‡ͺ Namur | 88 | 2005 | | 15 | [UGARIT](https://www.tamtam.ai/c/ugarit) (ugarit.tech)
A software development company with expertise in networking and security solutions, creating tailored architectures for optimal performance and protection | Software Development | πŸ‡§πŸ‡ͺ Aubange | 56 | 2016 | | 16 | [ARGAFIN](https://www.tamtam.ai/c/argafin) (argafin.com)
Financial management consulting firm specializing in assisting SMEs and start-ups with development, optimization, profitability, and implementing financial performance monitoring tools | Financial Services | πŸ‡§πŸ‡ͺ Ottignies-Louvain-la-Neuve | 41 | 2015 | | 17 | [Myrmidons](https://www.tamtam.ai/c/myrmidons) (myrmidons.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 | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Namur | 37 | 2018 | | 18 | [XYPII](https://www.tamtam.ai/c/xypii) (xypii.be)
An Ottignies-based engineer specializes in developing websites and applications, prioritizing customer advice to deliver solutions to end users | Software Development | πŸ‡§πŸ‡ͺ Ottignies | 31 | 2013 | | 19 | [Quimesis Engineering your ideas](https://www.tamtam.ai/c/quimesis-engineering-your-ideas) (quimesis.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 | Computers and Electronics Manufacturing | πŸ‡§πŸ‡ͺ Wavre | 31 | 2013 | | 20 | [Nalios](https://www.tamtam.ai/c/nalios) (nalios.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 | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Namur | 30 | 2020 | | 21 | [DVC-CO](https://www.tamtam.ai/c/dvc-co) (dvc-co.com)
A company founded in 1987 providing unique solutions through feasibility studies, product design, programming, certification, industrialization, and production for clients in Europe | Appliances, Electrical, and Electronics Manufacturing | πŸ‡§πŸ‡ͺ Nivelles | 24 | 1987 | | 22 | [Mielabelo](https://www.tamtam.ai/c/mielabelo) (mielabelo.be)
Operational consulting focused on enhancing organizational agility and performance through governance, information security, operational excellence, and quality management. | Business Consulting and Services | πŸ‡§πŸ‡ͺ Mons | 23 | 2009 | | 23 | [fullteam](https://www.tamtam.ai/c/fullteam) (fullteam.eu)
An advertising agency founded in 1987, offering graphic design, pre-press, video, and multimedia solutions with a focus on creativity, reactivity, and success | Advertising Services | πŸ‡§πŸ‡ͺ Nivelles | 22 | 1987 | | 24 | [Verstichel et Experts AssociΓ©s](https://www.tamtam.ai/c/verstichel-et-experts-associes) (immoexp.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 | Insurance | πŸ‡§πŸ‡ͺ Genappe | 20 | 1988 | | 25 | [TETRADE Consulting](https://www.tamtam.ai/c/tetrade-consulting) (tetrade.be)
A consulting firm specializing in ERP systems and digital technology for utilities and manufacturing companies, focusing on process optimization and IT system support | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Wavre | 19 | 2000 | | 26 | [V2i](https://www.tamtam.ai/c/v2i) (v2i.be)
A company specializing in vibration testing, numerical simulation, vibration measurements, health monitoring, and customized monitoring solutions for structural dynamics problems | Aviation and Aerospace Component Manufacturing | πŸ‡§πŸ‡ͺ LiΓ¨ge | 19 | 2004 | | 27 | [Ingenum](https://www.tamtam.ai/c/ingenum) (ingenum.be)
Ingenum is a Belgian consulting firm specialized in software development, offering analysis, advice, and implementation of web, mobile, and desktop applications | Software Development | πŸ‡§πŸ‡ͺ MaisiΓ¨res | 16 | 2018 | | 28 | [Sapristic](https://www.tamtam.ai/c/sapristic) (sapristic.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 | IT Services and IT Consulting | πŸ‡§πŸ‡ͺ Louvain-la-Neuve | 16 | 2014 | | 29 | [De Roo & Partners Expertises by Studibo](https://www.tamtam.ai/c/de-roo-and-partners-expertises-by-studibo) (derooexpertises.be)
An expertise bureau founded in 1996, now known as De Roo & Partners, specializing in assessments for insurance companies in Belgium | Insurance | πŸ‡§πŸ‡ͺ Verviers | 16 | 1996 | | 30 | [Alterius - Recouvrement de crΓ©ances](https://www.tamtam.ai/c/alterius-recouvrement-de-creances) (alterius.be)
Specialized association of Judicial Officers focusing on amicable and judicial debt collection, offering efficient services through continuous missions from amicable to judicial phases | Legal Services | πŸ‡§πŸ‡ͺ Charleroi | 15 | 1996 | | 31 | [Listen SA](https://www.tamtam.ai/c/listen-sa) (listen.eu)
Market research and consultancy firm specializing in listening to customers, employees, and citizens to provide pragmatic guidance and support in decision-making processes for various sectors | Market Research | πŸ‡§πŸ‡ͺ Hognoul | 15 | 2004 | | 32 | [Incidence](https://www.tamtam.ai/c/incidence) (incidence.be)
A market research consultancy providing tailored solutions for small to medium businesses in various sectors, offering operational insights typically reserved for larger corporations | Market Research | πŸ‡§πŸ‡ͺ Limal | 12 | 2013 | | 33 | [IntPact](https://www.tamtam.ai/c/intpact) (intpact.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 | Business Consulting and Services | πŸ‡§πŸ‡ͺ LiΓ¨ge | 11 | 2018 | | 34 | [E-nova](https://www.tamtam.ai/c/e-nova) (e-nova.be)
Specializing in energy efficiency, renewable energy, and sustainable energy practices, our expert engineers assist in designing and implementing energy projects for clients | Engineering Services | πŸ‡§πŸ‡ͺ Dour | 6 | 2004 | | 35 | [CAPTAIN AI ACADEMY](https://www.tamtam.ai/c/captain-ai-academy) (captainai.ai)
A leader in AI education for businesses, providing conferences, training, consultancy services, and custom AI solutions to drive digital transformation and innovation | Technology, Information and Internet | πŸ‡§πŸ‡ͺ Tourinnes-Saint-Lambert | 5 | 2008 | | 36 | [Creaction INT](https://www.tamtam.ai/c/creaction-int)
A consulting firm specializing in technology transfer, innovation management, project support, and workshops for developing and qualifying innovative solutions | Strategic Management Services | πŸ‡§πŸ‡ͺ Redu | 5 | 1988 | | 37 | [CTI Consulting](https://www.tamtam.ai/c/cti-consulting) (cticonsulting.be)
A multidisciplinary team of consultants helping organizations strategically leverage digital opportunities through digital transformation, legal tech compliance, information security, and training | Business Consulting and Services | πŸ‡§πŸ‡ͺ Seraing | 5 | 2017 | | 38 | [dantes - ImPertinent Business](https://www.tamtam.ai/c/dantes-impertinent-business) (dantes.pro)
This company aligns business goals with team members' personal aspirations, focusing on core competencies to drive motivation, ambition, autonomy, and career fulfillment | Business Consulting and Services | πŸ‡§πŸ‡ͺ Longchamps | 3 | 1999 | | 39 | [PROJECTIF](https://www.tamtam.ai/c/projectif) (projectif.be)
The company offers tailored coaching and facilitation services in team management, lean management, family business governance, and business succession planning | Business Consulting and Services | πŸ‡§πŸ‡ͺ Soiron | 2 | 1997 | ## 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](https://www.tamtam.ai/l/largest-companies-wallonia) (1,106) - [Multinational companies in Wallonia](https://www.tamtam.ai/l/multinational-companies-wallonia) (234) - [Companies with in-house R&D in Wallonia](https://www.tamtam.ai/l/r-and-d-companies-wallonia) (155) - [Manufacturers in Wallonia](https://www.tamtam.ai/l/manufacturers-wallonia) (151) - [Retail chains in Wallonia](https://www.tamtam.ai/l/retail-chains-wallonia) (110) - [Family-owned companies in Wallonia](https://www.tamtam.ai/l/family-owned-companies-wallonia) (82) - [Hardware manufacturers in Wallonia](https://www.tamtam.ai/l/hardware-companies-wallonia) (75) - [Food and Beverage Manufacturing companies in Wallonia](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-wallonia) (75) - [IT Services and IT Consulting companies in Wallonia](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-wallonia) (67) - [IT services companies in Wallonia](https://www.tamtam.ai/l/it-services-companies-wallonia) (67) - [Critical infrastructure operators in Wallonia](https://www.tamtam.ai/l/critical-infrastructure-operators-wallonia) (65) - [Consumer goods companies in Wallonia](https://www.tamtam.ai/l/consumer-goods-companies-wallonia) (59) - [Software Development companies in Wallonia](https://www.tamtam.ai/l/software-development-companies-wallonia) (58) - [Transportation, Logistics, Supply Chain and Storage companies in Wallonia](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-wallonia) (57) - [SaaS companies in Wallonia](https://www.tamtam.ai/l/saas-companies-wallonia) (54) - [Retail companies in Wallonia](https://www.tamtam.ai/l/retail-companies-wallonia) (52) - [Contract manufacturers in Wallonia](https://www.tamtam.ai/l/contract-manufacturers-wallonia) (51) - [Chemical companies in Wallonia](https://www.tamtam.ai/l/chemical-companies-wallonia) (45) - [Pharmaceutical companies in Wallonia](https://www.tamtam.ai/l/pharmaceutical-companies-wallonia) (45) - [Aerospace and defence companies in Wallonia](https://www.tamtam.ai/l/aerospace-and-defense-companies-wallonia) (44) - [Education providers in Wallonia](https://www.tamtam.ai/l/education-companies-wallonia) (43) - [Financial services firms in Wallonia](https://www.tamtam.ai/l/financial-services-firms-wallonia) (41) - [Distributors and wholesalers in Wallonia](https://www.tamtam.ai/l/distributors-and-wholesalers-wallonia) (39) - [Food and beverage companies in Wallonia](https://www.tamtam.ai/l/food-and-beverage-companies-wallonia) (38) ## The same list elsewhere in Belgium - [Professional services firms in Belgium](https://www.tamtam.ai/l/professional-services-firms-belgium) (396) - [Professional services firms in Flanders](https://www.tamtam.ai/l/professional-services-firms-flanders) (263) - [Professional services firms in Brussels](https://www.tamtam.ai/l/professional-services-firms-brussels) (64) - [Professional services firms in Antwerp](https://www.tamtam.ai/l/professional-services-firms-antwerp) (49) --- Source: https://www.tamtam.ai/l/professional-services-firms-wallonia