This selection of professional services firms in Belgium showcases a concentration of large and mid-sized companies, with a strong presence in IT services and consulting, as well as traditional accounting and engineering. Key players include BDO, a global accounting firm; freelance, specializing in customized ICT solutions; House of HR, providing staffing services; and Akka Technologies, an engineering consulting leader.
The companies listed exhibit a notable clustering of headquarters in Brussels, including TRACTEBEL for sustainable energy projects and TPF for multidisciplinary engineering consultancy. Many firms, such as Cegeka and delaware, focus on digital solutions and business transformation, indicating a strong emphasis on technology-driven professional services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
BDObdo.global
Providing professional services globally with 1800 offices, focusing on quality, technology, and innovative solutions for long-term client value. |
51,974 | |||
| 2 | 13,672 | ||||
| 3 |
House of HRhouseofhr.com
Provides skilled professionals and specialized staffing solutions across industries, including engineering, consulting, digital recruitment, and permanent placements. |
8,123 | |||
| 4 |
Akka Technologiesakkodis.com
European leader in engineering consulting and R&D services, supporting clients with digital solutions and expertise across various sectors throughout product life cycles. |
7,700 | |||
| 5 |
TRACTEBELtractebel-engie.com
Provides integrated solutions for sustainable energy and built environment projects, offering expertise in nuclear, renewables, power, grids, infrastructure, and water resources. |
7,185 | |||
| 6 |
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 | |||
| 7 |
Equans BeLuxequans.be
The company focuses on solving challenges by creating smarter cities, efficient industries, and sustainable buildings through a range of expertise and services |
4,917 | |||
| 8 |
TPFtpfgroup.com
Global multidisciplinary engineering consultancy providing end-to-end project execution across fifty countries using local know-how and international expertise for diverse infrastructure and development sectors. |
4,569 | |||
| 9 |
delaware Internationaldelaware.pro
Provides advanced business transformation solutions and services using SAP and Microsoft ecosystems, ensuring continuous improvement and sustainability. |
3,291 | |||
| 10 |
Deloitte Belgiumdeloitte.com
A leading audit and consulting practice in Belgium offering services in audit, accounting, tax, consulting, and financial advisory to national and international clients |
2,840 | |||
| 11 |
Arthur D. Littleadlittle.com
Providing creative and scientific solutions, we help clients anticipate change, innovate through technology and strategy, and make a positive impact globally |
2,467 | |||
| 12 |
Accent Jobsaccentjobs.be
Personalized recruitment services connecting job seekers and companies with flexible, permanent, local, and international job opportunities efficiently. |
1,940 | |||
| 13 |
delaware BeLuxdelaware.pro
Global provider of advanced IT solutions and services, guiding organizations through business and digital transformations with a focus on innovation, technology, and sustainability |
1,875 | |||
| 14 |
KPMG Belgiumkpmg.com
Helping organizations harness data to drive digitalization, manage risk, optimize costs, and stay relevant through technology, innovation, and compliance |
1,721 | |||
| 15 |
Marsh Europemarsh.com
Global leader in insurance brokerage and risk advisory services, offering data-driven solutions for commercial and individual clients worldwide Operating in 130+ countries |
1,682 | |||
| 16 |
Orizio Grouporizio-group.com
International aerospace ecosystem focusing on design, manufacturing, maintenance, and engineering services for aviation, space, and UAV markets through specialized high-tech subsidiary companies. |
1,609 | |||
| 17 |
PwC Belgiumpwc.be
Global network committed to solving important problems, building trust, and providing quality assurance, advisory, and tax services in 156 countries |
1,594 | |||
| 18 |
Partena Professionalpartena-professional.be
A service provider specializing in entrepreneurship and personnel management, offering support in administrative procedures, HR policy, legal advice, and consultancy services |
1,535 | |||
| 19 |
VinΓ§ottevincotte.be
It offers objective advisory services in inspection, certification, conformity assessment, and training, contributing to a safer, more efficient society for businesses and individuals. |
1,504 | |||
| 20 |
House Of Talents BEhouseoftalents.be
Specializing in matching candidates to job opportunities and filling client vacancies, this service group employs over 1,000 people across 13 specialized talents |
1,359 | |||
| 21 | 1,357 | ||||
| 22 |
Moore Belgiummoore.be
Leading independent accounting and consulting firm in Belgium helping entrepreneurs achieve their goals through a wide range of services including tax, audit, finance, and business consulting |
1,350 | |||
| 23 |
Mercer Europecorporate.marsh.com
Dedicated to providing advisory services and technological solutions to help organizations meet workforce health, investment, and career needs Operating in multiple countries |
1,235 | |||
| 24 |
Randstad Belgiumrandstad.be
Specializes in temporary staffing, ICT, engineering, life sciences, HR, finance, sales, and offers HR services like outplacement and assessments. |
1,176 | |||
| 25 |
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 | |||
| 26 |
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 | |||
| 27 |
AGO Jobs & HRago.jobs
Provides nationwide HR services with specialized divisions, focusing on authentic relationships and employees speaking clients' language sincerely and constructively. |
1,091 | |||
| 28 |
RMCrmconsulting.be
Specializing in Oracle E-Business Suite and Oracle Cloud applications, we provide implementation, consulting, training, upgrades, business intelligence solutions, and maintenance support services |
988 | |||
| 29 |
BDO Belgiumbdo.be
Providing audit, tax, legal, accounting, and advisory services with a personal approach, local presence, and global expertise for sustainable growth. |
987 | |||
| 30 |
Mensuramensura.be
Specializing in workplace prevention and health promotion, this team offers expert advice and personalized solutions to help maintain a productive and compliant workforce |
867 | |||
| 31 |
Logi-techniclogi-technic.be
Passionate problem solvers at a technical outsourcing agency tackling challenges with enthusiasm and expertise |
864 | |||
| 32 | 841 | ||||
| 33 |
Stibbestibbe.com
A leading independent international law firm providing high-quality legal advice, transactions, and litigation services to a diverse range of clients globally |
840 | |||
| 34 |
Actief Interimactief.be
Recruitment partner focusing on local, personal connections between companies and candidates, emphasizing sustainable growth and responsible business practices. |
839 | |||
| 35 |
QbD Groupqbdgroup.com
Support life science companies globally with regulatory, clinical, quality assurance, validation, software, and go-to-market services for medical products. |
834 | |||
| 36 |
Inetum-Realdolmeninetum.com
Specialized professionals guide over 800 customers worldwide in post-digital transformation, offering digital technology and innovation to optimize positive digital flow |
831 | |||
| 37 |
9altitudes9altitudes.com
End-to-end integrator specializing in ERP, PLM, DMS, and data solutions Improving business performance by deploying technological solutions and optimizing processes |
824 | |||
| 38 |
Copuscopus.group
HR group spreading joy of work, focusing on matching skilled talent with employers in technical, construction, and office roles through warm relationships |
804 | |||
| 39 |
United Consultingβ’unitedconsulting.be
We specialize in attracting top talent in Finance, Business Support, HR, Supply Chain, and Marketing, focusing on personal growth and success stories |
787 | |||
| 40 |
TUC RAILtucrail.be
Specialized engineering company providing innovative, sustainable railway technology and infrastructure solutions with multidisciplinary expertise for projects in Belgium and internationally. |
760 | |||
| 41 | 759 | ||||
| 42 |
Attentiaattentia.be
This company provides HR advice focused on well-being, protection, and prevention, finding optimal solutions for individuals and employing over 800 people |
739 | |||
| 43 |
Projective Groupprojectivegroup.com
Specialist in delivering holistic and pragmatic change solutions for clients within the Financial Services industry to thrive. |
725 | |||
| 44 | 688 | ||||
| 45 |
Vanbreda Risk & Benefitsvanbreda.be
A leading insurance broker in the Benelux with 85 years of experience, offering tailor-made solutions for businesses and individuals worldwide |
673 | |||
| 46 |
Sweco Belgiumswecobelgium.be
Sweco plans and designs sustainable buildings, efficient infrastructure, and clean water access in Europe and 70 countries worldwide |
666 | |||
| 47 |
CBTW IT & Technology / Positive Thinking Companycbtw.tech
Providing comprehensive technology solutions including software engineering, security, cloud, data analytics, and digital workplace through a global delivery model. |
644 | |||
| 48 |
Bright Plusbrightplus.be
Expertise in multilingual labor market, providing transparent, honest recruitment advice to find suitable talent for permanent or project roles. |
643 | |||
| 49 | 630 | ||||
| 50 |
SBB Accountants & Advisorssbb.be
Accounting firm providing bookkeeping, taxation, environmental regulation support, strategic advice, and ICT-backed services for businesses at all stages. |
590 | |||
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. | |||||
| 51 |
Vandelanottevandelanotte.be
A multidisciplinary team offering accountancy, audit, tax, legal, corporate finance, HR solutions, estate planning, cyber security, subsidy advice, and risk management services |
587 | |||
| 52 |
Human8wearehuman8.com
A human-driven consultancy that connects brands with people and culture to drive positive change, with a team of +900 across 23 locations worldwide |
587 | |||
| 53 | 586 | ||||
| 54 |
Sabena Engineeringsabena-engineering.com
International MRO provider for Commercial Aviation and Government/Defense markets Offers maintenance and engineering solutions, including line maintenance, components repair, and engine services |
577 | |||
| 55 |
Ardenaardena.com
Global provider of drug development, bioanalysis, and regulatory services with expertise in advanced formulations and specialized drug delivery technologies. |
566 | |||
| 56 | 558 | ||||
| 57 |
ITZU Groupitzu.eu
HR and Facility services provider focusing on people, offering recruitment, training, cleaning services, and career support for employees, clients, and partners |
538 | |||
| 58 |
SECO Groupgroupseco.com
A leading provider of technical risk prevention, quality supervision, and inspection services for construction projects, supporting innovation and sustainability |
525 | |||
| 59 |
Synergie Belgiumsynergiejobs.be
A team of 500 colleagues across 70+ locations in Belgium, specializing in Interim, Careers, Construct, and S&You to match individuals with the right workplaces |
520 | |||
| 60 | 518 | ||||
| 61 |
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 | |||
| 62 |
Studibostudibo.be
Studibo is a group of engineering and consulting firms in Flanders, offering comprehensive services for the construction sector with a focus on customer satisfaction and continuous improvement |
496 | |||
| 63 |
Konvertkonvert.be
A team-focused staffing agency offering tailored training, professional support, work/life balance, and opportunities for personal growth within a 25 km radius |
493 | |||
| 64 |
JooS Consultingjoosconsulting.be
Consulting firm specializing in finance, accounting, and business support, known for personal approach Offers growth opportunities, premium training, and fun afterwork events |
491 | |||
| 65 | 484 | ||||
| 66 |
Tempo-Team Belgiumtempo-team.be
Providing customized HR services and recruitment solutions for flexible and fixed work arrangements, serving large companies and SMEs. |
476 | |||
| 67 | 467 | ||||
| 68 |
TriFinance Belgiumtrifinance.com
An independent international growth service provider offering advice, implementation, and support in finance and control, focusing on achieving tangible results for clients |
467 | |||
| 69 |
ALASKA | Advisors Accountants Auditorsalaska-group.eu
Alaska provides accountancy, tax advice, and audit services in Belgium with a focus on personalized approach and quality service They are also a member of PrimeGlobal |
466 | |||
| 70 | 448 | ||||
| 71 |
Express Medicalexpressmedical.be
Specializing in recruitment and selection of nursing and paramedical staff since 1988, our company partners with healthcare facilities to provide staffing solutions based on partnership, professionalism, and passion |
441 | |||
| 72 |
Titeca Pro Accountants & Expertstiteca.be
A collaborative team of diverse professionals providing specialized expertise in various business domains, ensuring clients receive knowledgeable, experienced guidance for their future decisions |
438 | |||
| 73 |
Agidensagidens.com
Industrial process automation partner, improving production processes daily. Provides automation solutions, digital technologies, and value-added services for safer, smarter, more flexible, and sustainable production. |
434 | |||
| 74 |
Cronos Europacronoseuropa.com
Providing IT and digital communication solutions to European institutions, leveraging advanced technologies and extensive expertise across multiple countries. |
430 | |||
| 75 |
SDEalistar.net
The company helps modern businesses eliminate IT stress with software and infrastructure solutions to improve productivity, reduce costs, and enable growth |
427 | |||
| 76 |
Pauwels Consultingpauwelsconsulting.com
Staffing and managing projects with experts in engineering, life sciences, and IT for organizations across Belgium, France, and the Netherlands. |
426 | |||
| 77 |
Contec - Industrial Automation Solutionscontec-ias.com
International engineering specializing in improving industrial processes with services in electricity, automation, MES/MOM, and industrial IT, striving for added value and preparing companies for the future |
420 | |||
| 78 |
Laboreleclaborelec.com
A leading expertise and research center in electrical power technology, providing specialized services and solutions for the energy transition globally |
418 | |||
| 79 | 414 | ||||
| 80 | 411 | ||||
| 81 |
Superellipsesuperellipse.be
Award-winning design and innovation agency with expertise in digital product, strategy, branding, and spatial design Partnering with clients to create impactful experiences |
409 | |||
| 82 | 395 | ||||
| 83 |
CATTAN
A management consulting firm located in Dendermonde, Belgium, specializing in providing strategic guidance and solutions for businesses |
392 | |||
| 84 |
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 | |||
| 85 | 384 | ||||
| 86 |
IBF Expertiseibf.be
Consultancy services for international development projects focusing on economic growth, trade, education, social reforms, and institutional support in emerging economies. |
380 | |||
| 87 | 378 | ||||
| 88 |
SBEsbe-engineering.com
Innovative civil engineering and electromechanical solutions provider with expertise in port, river, civil engineering, urbanism, industrial constructions, and electromechanics #expertsatplay |
376 | |||
| 89 |
Gumption Groupgumption.eu
Innovative ecosystem specializing in brand, customer experience, digital technology, and process automation Co-creating the future with interconnected start-ups and scale-ups |
372 | |||
| 90 |
Coheziocohezio.be
A leading provider of external workplace prevention and protection services, offering a multidisciplinary team to ensure health, safety, and well-being at work |
372 | |||
| 91 |
Skill BuilderSskillbuilders.be
Skill BuilderS guides and coaches individuals and businesses towards sustainable workplace happiness through talent development, career counseling, assessment, and customized learning experiences |
370 | |||
| 92 |
Multi.engineeringmulti.engineering
The company provides flexible engineering solutions for clients in industries such as Industry, Building & Infrastructure, and Maritime & Offshore through design, sourcing, and consultancy services |
369 | |||
| 93 |
JONCKERSacclaro.com
The company provides quality translation and localization services since 1994 Their platform, WordsOnline, offers AI-powered translation solutions for global businesses |
368 | |||
| 94 |
Talentustalentus.be
A dedicated HR partner offering tailored recruitment solutions for companies of all sizes and sectors, connecting committed candidates with valuable skills |
367 | |||
| 95 | 365 | ||||
| 96 |
United Experts Groupunitedexpertsgroup.be
A knowledge network connecting businesses with diverse expertise to guide and advise entrepreneurs in achieving growth and realizing their plans at every crucial stage |
364 | |||
| 97 |
PKF BOFIDIpkfbofidi.com
Professional network offering accounting, tax, and services in Brussels, Antwerp, and Ghent Customer-oriented for SMEs, professionals, and international companies with proactive expertise |
359 | |||
| 98 |
Vivaldisvivaldisinterim.be
Connecting individuals with interim or permanent job opportunities, focusing on personality over experience and offering continuous job search support. |
359 | |||
| 99 |
Randstad Digital Belgiumrandstaddigital.be
Provides global talent, production capabilities, and specialized solutions for rapid business transformation, focusing on customer experience, engineering, data & analytics, and cloud. |
358 | |||
| 100 |
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 | |||
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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 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
- 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
- E-commerce companies in Belgium 201