# Professional services firms headquartered in Rotterdam
Tamtam tracks 61 professional services firms headquartered in Rotterdam. This list ranks the 30 largest by number of employees on LinkedIn, led by OMA, Zorgwerk and Robeco. Their median headcount is 532. Half of them were founded in 1993 or later.
This selection of professional services firms in Rotterdam includes a mix of established companies and those founded more recently. Key players include OMA, an international architecture practice, Zorgwerk, specializing in healthcare staffing, Robeco, an asset manager focused on sustainable investing, and CGI Nederland, a global IT and business consultancy. Other notable firms are Bilfinger BelgiΓ« & Nederland, providing industrial maintenance, and Moore DRV, accountants and advisors.
A clear pattern among these firms is their strong presence in the financial services sector, with companies like Robeco, Moore DRV, and GGN. Additionally, Rotterdam shows a concentration of staffing and recruiting agencies such as Zorgwerk, TOS People, and Daan, indicating a robust support system for various industries.
π³π± Rotterdam Β· 30 companies Β· Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [OMA](https://www.tamtam.ai/c/oma) (oma.com)
International architecture practice with a research and design studio, led by eight partners, known for innovative buildings worldwide, with offices in multiple cities | Architecture and Planning | π³π± Rotterdam | 1,905 | 1975 |
| 2 | [Zorgwerk](https://www.tamtam.ai/c/zorgwerk) (zorgwerk.nl)
Specializing in staffing solutions for the healthcare sector, providing excellent service to match supply and demand, with a focus on values like happiness and connectedness | Staffing and Recruiting | π³π± Rotterdam | 1,806 | 1997 |
| 3 | [Robeco](https://www.tamtam.ai/c/robeco) (robeco.com)
An international asset manager specializing in sustainable investing, offering active investment strategies for institutional and private investors across various asset classes | Financial Services | π³π± Rotterdam | 1,482 | 1929 |
| 4 | [CGI Nederland](https://www.tamtam.ai/c/cgi-nederland) (cgi.com)
Established in 1976, a global leader in IT and business consultancy, offering insights and results-driven solutions across 21 industries worldwide | IT Services and IT Consulting | π³π± Rotterdam | 1,435 | 1976 |
| 5 | [Bilfinger BelgiΓ« & Nederland](https://www.tamtam.ai/c/bilfinger-belgie-and-nederland) (bilfinger.com)
Industrial benchmark for projects and maintenance of industrial assets, ensuring safety and availability for clients in Belgium and the Netherlands Services include insulation, scaffolding, and more | Commercial and Industrial Machinery Maintenance | π³π± Rotterdam | 1,354 | 1950 |
| 6 | [Moore DRV](https://www.tamtam.ai/c/moore-drv) (moore-drv.nl)
Accountants and advisors supporting entrepreneurs in the real economy with expert insights, solutions, and support for lasting improvements in business performance | Financial Services | π³π± Rotterdam | 1,335 | 1922 |
| 7 | [Customs Support Group](https://www.tamtam.ai/c/customs-support-group) (customssupport.com)
Leading European provider of customs and trade solutions enhancing cross-border operations, compliance, cost optimization, and operational efficiency. | International Trade and Development | π³π± Rotterdam | 1,037 | 1999 |
| 8 | [Ecorys](https://www.tamtam.ai/c/ecorys) (ecorys.com)
This company provides research, consulting, communications, and management services to develop, deliver, and evaluate public policy on an international scale | Research Services | π³π± Rotterdam | 954 | 1929 |
| 9 | [TOS People](https://www.tamtam.ai/c/tos-people) (tospeople.com)
A family-owned maritime services provider offering selection, secondment, payroll, and training for various industries worldwide, focusing on people and quality service | Staffing and Recruiting | π³π± Rotterdam | 763 | 1992 |
| 10 | [GGN](https://www.tamtam.ai/c/ggn) (ggn.nl)
GGN is the largest debt collection and bailiff company in the Netherlands, focusing on helping individuals with financial difficulties while ensuring businesses get paid | Financial Services | π³π± Rotterdam | 720 | 2002 |
| 11 | [MetrixLab](https://www.tamtam.ai/c/metrixlab) (tolunacorporate.com)
Global market research and insights provider challenging industry norms with technology and expert-driven solutions for brand impact and sustainable growth worldwide | Market Research | π³π± Rotterdam | 662 | 1999 |
| 12 | [Daan](https://www.tamtam.ai/c/daan) (daan.eu)
A company that matches individuals with passion and ambition to suitable jobs in healthcare, education, and social security through personalized support and development opportunities | Staffing and Recruiting | π³π± Rotterdam | 656 | 2012 |
| 13 | [Schoo & Co.](https://www.tamtam.ai/c/schoo-and-co) (schooco.nl)
A global consulting firm offering specialized services to insurance, shipping, and off-shore industries with a focus on expertise, sustainability, and client-centric approach | Maritime Transportation | π³π± Rotterdam | 629 | 1940 |
| 14 | [VPS](https://www.tamtam.ai/c/vps) (vpsveritas.com)
A global leader in maritime decarbonisation advisory services, providing innovative testing and inspection solutions to optimize performance while reducing environmental impact | Professional Services | π³π± Rotterdam | 561 | |
| 15 | [DC](https://www.tamtam.ai/c/dc-rotterdam)
Multidisciplinary design agency specializing in developing visual identities for print and web, serving diverse clients in art, culture, brands, education, and government sectors | Design Services | π³π± Rotterdam | 532 | 1999 |
| 16 | [SKIM](https://www.tamtam.ai/c/skim) (skimgroup.com)
Global insights agency specializing in understanding decision-making for consumers, healthcare, and B2B professionals Offers practical marketing solutions through rigorous research techniques | Business Consulting and Services | π³π± Rotterdam | 513 | 1979 |
| 17 | [Rua](https://www.tamtam.ai/c/rua) (rua.nu)
RUA is a consultancy specializing in environmental management and participation, providing support in communication, stakeholder engagement, and community relations | Public Relations and Communications Services | π³π± Rotterdam | 500 | 2021 |
| 18 | [valantic NL](https://www.tamtam.ai/c/valantic-nl) (valantic.com)
Develops digital solutions, consulting services, and software, focusing on e-business, digital commerce, and marketing to integrate digital channels for client growth. | Business Consulting and Services | π³π± Rotterdam | 478 | 1992 |
| 19 | [Flanderijn](https://www.tamtam.ai/c/flanderijn) (flanderijn.nl)
A leading organization in debt collection and enforcement, offering quality and results-driven services with a strong presence in the Netherlands, Belgium, and Luxembourg | Financial Services | π³π± Rotterdam | 456 | 1948 |
| 20 | [Carrière Uitzendbureau](https://www.tamtam.ai/c/carriere-uitzendbureau) (carriere.com)
Committed to improving organizational performance, CarriΓ¨re focuses on HR processes and values customer satisfaction, knowledge sharing, and top-notch service provision | Staffing and Recruiting | π³π± Rotterdam | 453 | 2010 |
| 21 | [Cardano](https://www.tamtam.ai/c/cardano) (cardano.nl)
An investment management and advisory business focusing on risk and sustainability, supporting pension schemes to secure resilient financial outcomes for savers and society | Financial Services | π³π± Rotterdam | 448 | 2000 |
| 22 | [Visser & Visser](https://www.tamtam.ai/c/visser-and-visser) (visser-visser.nl)
A team of specialists at this company assists with international business ventures in the Netherlands, providing expertise in tax, employment law, and finance Through PrimeGlobal, they offer global support | Financial Services | π³π± Rotterdam | 434 | 1989 |
| 23 | [TWD](https://www.tamtam.ai/c/twd) (twd.nl)
Providing custom-designed solutions for offshore and heavy civil installation projects, including innovations, seafastening structures, lifting tools, and more Contact us for practical solutions 24/7 | Civil Engineering | π³π± Rotterdam | 406 | |
| 24 | [Recruitment Company](https://www.tamtam.ai/c/recruitment-company) (recruitmentcompany.nl)
Specializing in management search for industries such as technical, production, food, and logistics, recruiting talented managers with 5+ years experience and bachelor/master degrees | Staffing and Recruiting | π³π± Rotterdam | 389 | 1999 |
| 25 | [MVRDV](https://www.tamtam.ai/c/mvrdv) (mvrdv.com)
A Rotterdam-based architectural firm specializing in innovative and sustainable solutions for urban and architectural projects worldwide through collaborative and research-based design methods | Architecture and Planning | π³π± Rotterdam | 370 | 1993 |
| 26 | [Rebel](https://www.tamtam.ai/c/rebel) (rebelgroup.com)
Development and advisory of public-private partnerships, innovative financing, project delivery, investment management, and strategic consulting across sustainability and social sectors. | Strategic Management Services | π³π± Rotterdam | 346 | 2002 |
| 27 | [Profource](https://www.tamtam.ai/c/profource) (profource.com)
Profource is a service-oriented Oracle specialist with nearly 300 professionals, offering expertise in Finance & ERP to optimize, manage, and utilize Oracle Applications effectively | Financial Services | π³π± Rotterdam | 265 | |
| 28 | [Flo Group, Part of Accenture](https://www.tamtam.ai/c/flo-group-part-of-accenture) (flo-group.com)
A global team working with organizations to optimize logistics performance, drive business transformation, and deliver value through supply chain solutions | IT Services and IT Consulting | π³π± Rotterdam | 251 | 2007 |
| 29 | [Brink \| bouw, infra en vastgoed](https://www.tamtam.ai/c/brink-bouw-infra-en-vastgoed) (brink.nl)
A company in the heart of construction, infrastructure, and real estate, providing management services, software products, and financial solutions with a diverse team and expertise | Business Consulting and Services | π³π± Rotterdam | 240 | 1972 |
| 30 | [Ecclesia Risk & Benefits](https://www.tamtam.ai/c/ecclesia-risk-and-benefits) (ecclesia.nl)
Ecclesia is a consultancy and business service provider specializing in risk management, employee benefits, and insurance for a wide range of organizations | Insurance | π³π± Rotterdam | 239 | |
## 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.
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- [Financial services firms in Rotterdam](https://www.tamtam.ai/l/financial-services-firms-rotterdam) (31)
- [IT Services and IT Consulting companies in Rotterdam](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-rotterdam) (30)
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## The same list elsewhere in Netherlands
- [Professional services firms in the Netherlands](https://www.tamtam.ai/l/professional-services-firms-netherlands) (739)
- [Professional services firms in North Holland](https://www.tamtam.ai/l/professional-services-firms-north-holland) (207)
- [Professional services firms in South Holland](https://www.tamtam.ai/l/professional-services-firms-south-holland) (145)
- [Professional services firms in North Brabant](https://www.tamtam.ai/l/professional-services-firms-north-brabant) (106)
- [Professional services firms in Gelderland](https://www.tamtam.ai/l/professional-services-firms-gelderland) (44)
- [Professional services firms in Overijssel](https://www.tamtam.ai/l/professional-services-firms-overijssel) (34)
- [Professional services firms in Amsterdam](https://www.tamtam.ai/l/professional-services-firms-amsterdam) (153)
- [Professional services firms in Utrecht](https://www.tamtam.ai/l/professional-services-firms-utrecht) (80)
- [Professional services firms in Eindhoven](https://www.tamtam.ai/l/professional-services-firms-eindhoven) (26)
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Source: https://www.tamtam.ai/l/professional-services-firms-rotterdam