# Top 50 professional services firms in North Rhine-Westphalia

Tamtam tracks 147 professional services firms headquartered in North Rhine-Westphalia. This list ranks the 50 largest by number of employees on LinkedIn, led by adesso SE, FERCHAU and Formel D Group. Their median headcount is 694. Half of them were founded in 1979 or later. The most common headquarters are Cologne (11), Düsseldorf (8) and Bielefeld (5).

These are large and mid-sized professional services firms headquartered in North Rhine-Westphalia, active in IT, engineering, consulting, and human resources. adesso SE, based in Dortmund, is an IT service provider optimizing business processes. FERCHAU, from Gummersbach, specializes in technology services. Formel D Group, headquartered in Cologne, provides automotive services, while Grant Thornton Germany in Düsseldorf offers audit and professional services.

The companies on this list, many founded in the 1990s, show a strong concentration in the cities of Cologne and Düsseldorf. Other notable firms include FEV Europe GmbH in Aachen, which develops vehicle and powertrain solutions, and DIS AG in Düsseldorf, a personnel service provider. The range of services indicates a robust and diversified professional services sector across the region.

🇩🇪 North Rhine-Westphalia · 50 companies · Updated Nov 15, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [adesso SE](https://www.tamtam.ai/c/adesso-se) (adesso.de)<br>Innovative IT service provider optimizing core business processes with tailored solutions, combining technological expertise with deep industry understanding #GrowTogether #GreatPlacetoWork | IT Services and IT Consulting | 🇩🇪 Dortmund | 6,389 | 1997 |
| 2 | [FERCHAU](https://www.tamtam.ai/c/ferchau) (ferchau.com)<br>Leading European platform for top technology services, specializing in developing future-centric solutions across various technical sectors with bright minds | Engineering Services | 🇩🇪 Gummersbach | 4,019 | 1966 |
| 3 | [Formel D Group](https://www.tamtam.ai/c/formel-d-group) (formeld.com)<br>Global automotive service provider offering market leading concepts and scalable solutions across the automotive value chain, from development to aftersales service Passion, professionalism, team spirit | Business Consulting and Services | 🇩🇪 Cologne | 3,726 | 1993 |
| 4 | [Grant Thornton Germany](https://www.tamtam.ai/c/grant-thornton-germany) (grantthornton.de)<br>A leading audit firm in Germany with 1,500 employees across 11 locations, helping clients achieve their goals through professional services | Professional Services | 🇩🇪 Düsseldorf | 1,493 | 1958 |
| 5 | [FEV Europe GmbH](https://www.tamtam.ai/c/fev-europe-gmbh) (fev.com)<br>Develops vehicle, powertrain hardware, software solutions, from design, testing to production, including consulting. Specializes in electrification, alternative fuels, and automated driving. | Motor Vehicle Manufacturing | 🇩🇪 Aachen | 1,400 | 1978 |
| 6 | [DIS AG](https://www.tamtam.ai/c/dis-ag) (dis-ag.com)<br>Industry-leading personnel service provider focusing on matching skilled professionals with new career opportunities, setting high standards in HR innovation and diversity | Human Resources Services | 🇩🇪 Düsseldorf | 1,395 | 1967 |
| 7 | [umlaut company](https://www.tamtam.ai/c/umlaut-company) (accenture.com)<br>Global professional services company specializing in digital transformation, technology, consulting, operations, and industry solutions for diverse clients worldwide. | Business Consulting and Services | 🇩🇪 Aachen | 1,249 | 1996 |
| 8 | [zeb consulting](https://www.tamtam.ai/c/zeb-consulting) (zeb-consulting.com)<br>Leading strategy, management, and IT consultancy in financial services across Europe, offering transformation expertise, proprietary software, and long-lasting business solutions | Business Consulting and Services | 🇩🇪 Münster | 1,195 | 1992 |
| 9 | [conet](https://www.tamtam.ai/c/conet) (conet.de)<br>Digitization partner offering consulting, customer experience, data intelligence, managed services, SAP, and software development to industrial, commercial, and public sector clients | IT Services and IT Consulting | 🇩🇪 Bonn | 1,148 | 1987 |
| 10 | [TEMPTON Group](https://www.tamtam.ai/c/tempton-group) (tempton.de)<br>The TEMPTON Group provides high-quality solutions for diverse HR challenges, offering new perspectives for businesses and development opportunities for individuals | Human Resources Services | 🇩🇪 Essen | 1,017 | 2007 |
| 11 | [TÜV Rheinland Asia](https://www.tamtam.ai/c/tuv-rheinland-asia) (tuv.com)<br>A global leader providing technical services focused on safety and quality, with nearly 20,000 employees and annual revenues close to €2 billion | Public Safety | 🇩🇪 Cologne | 1,015 | 1872 |
| 12 | [Luther Rechtsanwaltsgesellschaft mbH](https://www.tamtam.ai/c/luther-rechtsanwaltsgesellschaft-mbh) (luther-lawfirm.com)<br>Provides comprehensive legal and tax services to medium-sized enterprises, large corporations, and public sector clients across Europe and Asia. | Legal Services | 🇩🇪 Cologne | 963 | 1992 |
| 13 | [TIMETOACT GROUP](https://www.tamtam.ai/c/timetoact-group) (timetoact-group.com)<br>The company specializes in modernizing and integrating IT applications for businesses, while also designing and implementing digital business models for innovative clients | IT Services and IT Consulting | 🇩🇪 Cologne | 952 |  |
| 14 | [Detecon](https://www.tamtam.ai/c/detecon) (detecon.com)<br>Leading consulting partner specializing in digital transformation, connectivity, and communications to implement innovative business models for enhanced customer experiences and employee satisfaction. | Business Consulting and Services | 🇩🇪 Cologne | 950 | 1977 |
| 15 | [BCG Platinion](https://www.tamtam.ai/c/bcg-platinion) (bcgplatinion.com)<br>Global interdisciplinary consultancy delivering large-scale technology projects, platform architecture, and cybersecurity solutions to accelerate digital transformations and drive innovation for diverse clients. | Business Consulting and Services | 🇩🇪 Cologne | 945 | 2000 |
| 16 | [Baker Tilly Germany](https://www.tamtam.ai/c/baker-tilly-germany) (bakertilly.de)<br>A global consulting firm offering personalized services in Audit & Advisory, Tax, Legal, and Consulting with interdisciplinary teams and industry expertise | Business Consulting and Services | 🇩🇪 Düsseldorf | 916 | 1979 |
| 17 | [BAD GmbH](https://www.tamtam.ai/c/bad-gmbh) (bad-gmbh.de)<br>The company provides prevention services to 280,000 businesses and 4 million employees in Germany and Europe, covering areas such as occupational safety, health, and security | Health and Human Services | 🇩🇪 Bonn | 847 | 1976 |
| 18 | [Inverto \| A BCG Company](https://www.tamtam.ai/c/inverto-a-bcg-company) (inverto.com)<br>An international management consultancy specializing in strategic procurement and supply chain management, helping clients reduce costs, optimize processes, and digitize procurement | Business Consulting and Services | 🇩🇪 Cologne | 838 | 2000 |
| 19 | [Convista](https://www.tamtam.ai/c/convista) (convista.com)<br>A consultancy specializing in transformation, helping clients design and implement new business processes and end-to-end SAP and IT solutions | IT Services and IT Consulting | 🇩🇪 Walldorf | 825 | 1999 |
| 20 | [NTT DATA Business Solutions Germany](https://www.tamtam.ai/c/ntt-data-business-solutions-germany) (nttdata-solutions.com)<br>Providing expert implementation and management of SAP solutions for companies worldwide to drive digital transformation and maximize business potential | IT Services and IT Consulting | 🇩🇪 Bielefeld | 818 | 1989 |
| 21 | [DMT GROUP](https://www.tamtam.ai/c/dmt-group) (dmt-group.com)<br>A global engineering services and consulting company specializing in plant engineering, infrastructure, natural resources, and energy, creating sustainable value for clients worldwide | Civil Engineering | 🇩🇪 Essen | 810 | 1737 |
| 22 | [HEUKING](https://www.tamtam.ai/c/heuking) (heuking.de)<br>A leading German business law firm with over 400 legal professionals offering comprehensive legal advice to a range of clients | Law Practice | 🇩🇪 Düsseldorf | 744 | 1971 |
| 23 | [Flick Gocke Schaumburg](https://www.tamtam.ai/c/flick-gocke-schaumburg) (fgs.de)<br>Specializing in tax-focused legal advice, the team of lawyers, tax advisors, and auditors provide interdisciplinary services to a diverse client base | Legal Services | 🇩🇪 Bonn | 735 | 1972 |
| 24 | [Projektträger Jülich, Forschungszentrum Jülich GmbH](https://www.tamtam.ai/c/projekttrager-julich-forschungszentrum-julich-gmbh) (ptj.de)<br>As a leading project sponsor in Germany, we support public and private entities in research and innovation management, focusing on funding programs and developing a competitive research and innovation landscape | Research Services | 🇩🇪 Jülich | 703 | 1974 |
| 25 | [EY ifb](https://www.tamtam.ai/c/ey-ifb) (ey.com)<br>Helps banks and insurance companies transform finance, risk, and digital functions. Maps supervisory, management, accounting, and risk demands into advanced IT architectures. | Business Consulting and Services | 🇩🇪 Cologne | 694 | 1989 |
| 26 | [Bilfinger Region DACH](https://www.tamtam.ai/c/bilfinger-region-dach) (bilfinger.com)<br>The company is a market leader in industrial services, part of a global group, specializing in planning and monitoring facilities in process industries | Industrial Machinery Manufacturing | 🇩🇪 Oberhausen | 692 |  |
| 27 | [GÖRG](https://www.tamtam.ai/c/gorg) (goerg.de)<br>A leading German business law firm with expertise in insolvency, restructuring, corporate, real estate, and procurement law, serving clients nationally and internationally | Law Practice | 🇩🇪 Cologne | 685 | 1996 |
| 28 | [P3 Group](https://www.tamtam.ai/c/p3-group)<br>This company has been rebranded as umlaut and provides consulting services Another part focuses on a different sector | Management Consulting | 🇩🇪 Aachen | 668 |  |
| 29 | [DLR Projektträger](https://www.tamtam.ai/c/dlr-projekttrager) (projekttraeger.dlr.de)<br>Provides comprehensive knowledge-based services for managing research, education, and innovation, including strategy advice, funding program implementation, knowledge transfer, and impact evaluation for clients. | Research Services | 🇩🇪 Bonn | 667 | 1975 |
| 30 | [Kienbaum](https://www.tamtam.ai/c/kienbaum) (kienbaum.com)<br>A leadership advisory and management consulting firm that brings potential to life by matching individuals and companies for a sustainable future | Business Consulting and Services | 🇩🇪 Cologne | 650 | 1945 |
| 31 | [Dataciders GmbH](https://www.tamtam.ai/c/dataciders-gmbh) (dataciders.com)<br>A leading service provider in the German-speaking region, specializing in Data & Analytics solutions to prevent bad decisions, offering end-to-end implementation | IT Services and IT Consulting | 🇩🇪 Dortmund | 648 |  |
| 32 | [Schüßler-Plan](https://www.tamtam.ai/c/schussler-plan) (schuessler-plan.de)<br>With over 1000 experts at 22 locations, this leading German engineering company specializes in transportation infrastructure planning, building design, and project management services | Engineering Services | 🇩🇪 Düsseldorf | 633 | 1958 |
| 33 | [dhpg](https://www.tamtam.ai/c/dhpg) (dhpg.de)<br>A medium-sized firm offering tax audit, accountancy, and legal advice services with a personal touch, serving clients nationally and internationally | Business Consulting and Services | 🇩🇪 Bonn | 614 | 1949 |
| 34 | [itelligence](https://www.tamtam.ai/c/itelligence) (nttdata-solutions.com)<br>The company provides business solutions and services under the new brand since April 1, 2021 as part of NTT DATA | IT Services and IT Consulting | 🇩🇪 Bielefeld | 557 |  |
| 35 | [Ecclesia Group](https://www.tamtam.ai/c/ecclesia-group) (ecclesia.com)<br>A leading European insurance broker for corporations and institutions, offering exciting tasks, professional development, and training opportunities in various fields | Insurance | 🇩🇪 Detmold | 557 | 1909 |
| 36 | [UNITY Consulting & Innovation](https://www.tamtam.ai/c/unity-consulting-and-innovation) (unity-consulting.com)<br>UNITY is a management consultancy specializing in innovation and transformation, helping global players and midsize companies master digital transformations for future success | Business Consulting and Services | 🇩🇪 Büren | 523 | 1995 |
| 37 | [codecentric AG](https://www.tamtam.ai/c/codecentric-ag) (codecentric.de)<br>A leading custom software development company in Germany, specializing in agile methodologies and innovative technologies with a focus on future software solutions | IT Services and IT Consulting | 🇩🇪 Solingen | 522 | 2004 |
| 38 | [mindsquare AG](https://www.tamtam.ai/c/mindsquare-ag) (mindsquare.de)<br>A leading IT consulting firm specializing in SAP and Salesforce, fostering personal development and digital excellence through individual software development and technology consultancy | IT Services and IT Consulting | 🇩🇪 Bielefeld | 507 | 2007 |
| 39 | [Piening Personal](https://www.tamtam.ai/c/piening-personal) (piening-personal.de)<br>A leading German personnel service provider specializing in temporary employment, offering flexible solutions for clients and prioritizing employee satisfaction and development | Staffing and Recruiting | 🇩🇪 Bielefeld | 462 | 1979 |
| 40 | [Qvest Global](https://www.tamtam.ai/c/qvest-global) (qvest.com)<br>A global technology consultancy specializing in digital transformation, system architecture, ICT integration, and software development for media industry innovation | Technology, Information and Media | 🇩🇪 Cologne | 457 | 1991 |
| 41 | [CURACON GmbH](https://www.tamtam.ai/c/curacon-gmbh) (curacon.de)<br>Curacon provides auditing, legal, and consulting services for healthcare, social, public, and church sectors with over 2,000 clients in Germany | Business Consulting and Services | 🇩🇪 Münster | 449 | 1936 |
| 42 | [RLE INTERNATIONAL Group](https://www.tamtam.ai/c/rle-international-group) (rle.international)<br>A global leader in development, technology, and consultation services for international mobility industries, with over 30 years of experience and locations worldwide | Motor Vehicle Manufacturing | 🇩🇪 Overath | 447 | 1985 |
| 43 | [ZETCON Ingenieure GmbH](https://www.tamtam.ai/c/zetcon-ingenieure-gmbh) (zetcon.de)<br>Planning, supervision, consulting, and management of sustainable infrastructure projects in energy, environment, transport, and urban development sectors. | Engineering Services | 🇩🇪 Bochum | 442 | 1973 |
| 44 | [TAKENAKA EUROPE](https://www.tamtam.ai/c/takenaka-europe) (takenaka.eu)<br>A family-owned company with over 400 years of experience in architecture, engineering, and construction, specializing in future-oriented industrial and residential properties in Europe | Construction | 🇩🇪 Düsseldorf | 440 | 1973 |
| 45 | [Cassini Consulting AG](https://www.tamtam.ai/c/cassini-consulting-ag) (cassini.de)<br>Innovative management and technology consulting firm challenging conventions, leading clients forward with a focus on digitalization, disruption, knowledge advancement, and industry leadership | Business Consulting and Services | 🇩🇪 Düsseldorf | 440 | 2006 |
| 46 | [Taylor Wessing Germany](https://www.tamtam.ai/c/taylor-wessing-germany) (taylorwessing.com)<br>A leading international law firm with over 1,100 lawyers providing high-quality legal consultancy services in various practice areas across Europe and Asia | Law Practice | 🇩🇪 Düsseldorf | 421 | 1863 |
| 47 | [ALS Germany](https://www.tamtam.ai/c/als-germany) (alsglobal.com)<br>An international laboratory, testing, and consulting company with 22 locations in Europe and China, focusing on quality, safety, environmental protection, and health | Chemical Manufacturing | 🇩🇪 Altenberge | 418 | 1983 |
| 48 | [FEV Group](https://www.tamtam.ai/c/fev-group) (fev.com)<br>Design and development of internal combustion engines, electric and alternative drive systems, energy technology, and advanced testing services. | Engineering Services | 🇩🇪 Aachen | 410 | 1978 |
| 49 | [apsolut Group](https://www.tamtam.ai/c/apsolut-group) (ap-solut.com)<br>Specializes in SAP and SAP Ariba procurement solutions including on-premise, cloud, hybrid setups, with expertise in SAP S/4HANA and Fieldglass. | IT Services and IT Consulting | 🇩🇪 Bielefeld | 398 | 2005 |
| 50 | [Griesemann Gruppe](https://www.tamtam.ai/c/griesemann-gruppe) (griesemann.com)<br>A strong partner in holistic industrial plant construction, offering engineering services, maintenance, and lightning protection Emphasis on teamwork and growth opportunities | Engineering Services | 🇩🇪 Wesseling | 397 | 1976 |

## 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 15, 2026.

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## The same list elsewhere

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Source: https://www.tamtam.ai/l/professional-services-firms-north-rhine-westphalia