The companies listed here are professional services firms in South Holland, primarily large organizations. They span a range of sectors including IT, financial services, engineering, and insurance.
Notable companies include Kiwa, a global leader in Testing, Inspection, and Certification; MN, offering solutions for pension funds and institutional investors; Centric, a partner in digital transformation; and OMA, an international architecture practice. The data shows a concentration of headquarters in Rotterdam, indicating a significant hub for these professional services firms.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 4,320 | ||||
| 2 | 3,291 | ||||
| 3 |
Bilfinger Engineeringbilfinger.com
Multidisciplinary engineering consultancy offering future-proof and sustainable solutions for industrial projects across various markets with a focus on project management and procurement |
2,973 | |||
| 4 |
Centriccentric.eu
A leading partner in digital transformation, providing software solutions, IT assessments, cloud services, staffing, and business process outsourcing to a diverse range of clients |
2,900 | |||
| 5 | 2,462 | ||||
| 6 |
CED Europecedgroup.eu
A European tech-enabled insurance services platform with a focus on expert claims management, innovation, and customer satisfaction through technology and personalized solutions |
1,941 | |||
| 7 | 1,905 | ||||
| 8 |
Zorgwerkzorgwerk.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 |
1,806 | |||
| 9 |
Robecorobeco.com
An international asset manager specializing in sustainable investing, offering active investment strategies for institutional and private investors across various asset classes |
1,482 | |||
| 10 | 1,439 | ||||
| 11 |
CGI Nederlandcgi.com
Established in 1976, a global leader in IT and business consultancy, offering insights and results-driven solutions across 21 industries worldwide |
1,435 | |||
| 12 |
Bilfinger BelgiΓ« & Nederlandbilfinger.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 |
1,354 | |||
| 13 |
Moore DRVmoore-drv.nl
Accountants and advisors supporting entrepreneurs in the real economy with expert insights, solutions, and support for lasting improvements in business performance |
1,335 | |||
| 14 |
Customs Support Groupcustomssupport.com
Leading European provider of customs and trade solutions enhancing cross-border operations, compliance, cost optimization, and operational efficiency. |
1,037 | |||
| 15 |
Kiwa Nederlandkiwa.com
A global leader in testing, inspection, and certification services, ensuring trust in products, services, processes, systems, and employees for clients worldwide |
984 | |||
| 16 |
Ecorysecorys.com
This company provides research, consulting, communications, and management services to develop, deliver, and evaluate public policy on an international scale |
954 | |||
| 17 | 924 | ||||
| 18 | 919 | ||||
| 19 |
Deernsdeerns.com
Independent engineering firm specializing in technical consulting and engineering solutions for various sectors worldwide, delivering high-quality services tailored to client's unique needs since 1928 |
800 | |||
| 20 |
Grant Thornton Netherlandsgrantthornton.nl
A member of Grant Thornton International Ltd, offering audit, tax, and advisory services with a global network of professionals |
776 | |||
| 21 |
TOS Peopletospeople.com
A family-owned maritime services provider offering selection, secondment, payroll, and training for various industries worldwide, focusing on people and quality service |
763 | |||
| 22 |
WTS Energywtsenergy.com
Supporting organizations in the Energy Transition by providing expertise, flexibility, and technology for sustainable power generation projects through trusted partnerships and consistent service quality |
733 | |||
| 23 | 720 | ||||
| 24 |
MetrixLabtolunacorporate.com
Global market research and insights provider challenging industry norms with technology and expert-driven solutions for brand impact and sustainable growth worldwide |
662 | |||
| 25 | 656 | ||||
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 |
Schoo & 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 |
629 | |||
| 27 |
KH Engineeringkhe.eu
Multidisciplinary engineering firm offering full-service support for projects worldwide Specializes in innovative technological solutions with a focus on safety and sustainability |
570 | |||
| 28 |
VPSvpsveritas.com
A global leader in maritime decarbonisation advisory services, providing innovative testing and inspection solutions to optimize performance while reducing environmental impact |
561 | |||
| 29 | 545 | ||||
| 30 | 544 | ||||
| 31 |
DC
Multidisciplinary design agency specializing in developing visual identities for print and web, serving diverse clients in art, culture, brands, education, and government sectors |
532 | |||
| 32 |
SKIMskimgroup.com
Global insights agency specializing in understanding decision-making for consumers, healthcare, and B2B professionals Offers practical marketing solutions through rigorous research techniques |
513 | |||
| 33 | 500 | ||||
| 34 | 490 | ||||
| 35 | 485 | ||||
| 36 |
valantic NLvalantic.com
Develops digital solutions, consulting services, and software, focusing on e-business, digital commerce, and marketing to integrate digital channels for client growth. |
478 | |||
| 37 |
iPS Powerful People (B Corpβ’)ipspowerfulpeople.com
An international personnel provider in Maritime, Energy, Tunnelling & Civil industries offering transparent, flexible, and professional personnel solutions with global service |
466 | |||
| 38 |
Carrière Uitzendbureaucarriere.com
Committed to improving organizational performance, Carrière focuses on HR processes and values customer satisfaction, knowledge sharing, and top-notch service provision |
453 | |||
| 39 |
Cardanocardano.nl
An investment management and advisory business focusing on risk and sustainability, supporting pension schemes to secure resilient financial outcomes for savers and society |
448 | |||
| 40 | 435 | ||||
| 41 |
Visser & Visservisser-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 |
434 | |||
| 42 |
Pels Rijckenpelsrijcken.nl
Specializing in legal services, our team at Pels Rijcken provides tailored solutions for leading clients, particularly in the public sector Visit our website for more information |
412 | |||
| 43 | 406 | ||||
| 44 |
Recruitment Companyrecruitmentcompany.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 |
389 | |||
| 45 |
Public Supportpublicsupport.nl
Public Support is a team of supportive professionals dedicated to helping others excel, especially in the public sector, creating space for growth and trust |
387 | |||
| 46 |
Van Ameyde Groupvanameyde.com
Global professional services firm specializing in insurance, claims, and risk management, providing swift solutions and unrivaled systems to secure clients' success worldwide |
382 | |||
| 47 | 370 | ||||
| 48 | 355 | ||||
| 49 |
Rebelrebelgroup.com
Development and advisory of public-private partnerships, innovative financing, project delivery, investment management, and strategic consulting across sustainability and social sectors. |
346 | |||
| 50 |
Deerns Nederlanddeerns.com
An independent engineering firm providing consulting and engineering solutions globally, specializing in Airports, Healthcare, Data Centers, Laboratories, Cleanrooms, and Commercial Real Estate |
343 | |||
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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 13, 2026.
More company lists in South Holland
- The largest companies in South Holland 2,508
- Multinational companies in South Holland 559
- Transportation, Logistics, Supply Chain and Storage companies in South Holland 276
- Logistics companies in South Holland 263
- Retail chains in South Holland 188
- Critical infrastructure operators in South Holland 152
- Truck Transportation companies in South Holland 145
- Software Development companies in South Holland 142
- Companies with in-house R&D in South Holland 140
- SaaS companies in South Holland 137
- Manufacturers in South Holland 134
- Family-owned companies in South Holland 128
- Healthcare providers in South Holland 124
- IT Services and IT Consulting companies in South Holland 121
- Financial services firms in South Holland 120
- Education providers in South Holland 111
- Hospitals and Health Care companies in South Holland 109
- Financial Services companies in South Holland 107
- Consulting firms in South Holland 106
- Distributors and wholesalers in South Holland 96
- IT services companies in South Holland 93
- Hardware manufacturers in South Holland 86
- Hotel and hospitality groups in South Holland 86
- Public sector organisations in South Holland 82
The same list elsewhere in Netherlands
- Professional services firms in the Netherlands 739
- Professional services firms in North Holland 207
- Professional services firms in North Brabant 106
- Professional services firms in Gelderland 44
- Professional services firms in Overijssel 34
- Professional services firms in Amsterdam 153
- Professional services firms in Utrecht 80
- Professional services firms in Rotterdam 61
- Professional services firms in Eindhoven 26