# The 100 largest professional services firms in Europe

Tamtam tracks 13,699 professional services firms headquartered in Europe. This list ranks the 100 largest by number of employees on LinkedIn, led by Randstad, EY and Capgemini. Their median headcount is 15,725. Half of them were founded in 1980 or later. The most common headquarters are London (22), Paris (10) and Madrid (4).

This selection of professional services firms in Europe includes some of the largest companies in the sector. Among them are global giants like Randstad, which provides HR services and staffing, and EY, offering assurance, consulting, and tax services. Capgemini specializes in IT services and consulting, while KPMG Italy focuses on audit, advisory, and tax. Other prominent firms include Adecco in staffing, and Allianz Services providing specialized core insurance operations.

The companies listed demonstrate a broad geographic distribution of headquarters across Europe, with a notable concentration in major cities such as London, Paris, and Milan. Industries represented span human resources, IT services, financial services, security, and environmental services, indicating the diverse nature of professional services across the continent.

🌍 Europe · 100 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Randstad](https://www.tamtam.ai/c/randstad) (randstad.com)<br>Provides companies with quality workforces, helps people find jobs, advises on HR needs, and offers training, combining technology with personalized human attention. | Human Resources Services | 🇳🇱 Diemen | 653,000 | 1960 |
| 2 | [EY](https://www.tamtam.ai/c/ey) (ey.com)<br>A global organization with diverse teams in over 150 countries provides assurance, consulting, law, strategy, tax, and transactions to help clients grow and transform | Professional Services | 🇬🇧 London | 404,207 |  |
| 3 | [Capgemini](https://www.tamtam.ai/c/capgemini-paris) (capgemini.com)<br>Imagine future organizations, making it real with AI, technology, and people, delivering end-to-end services and solutions across strategy, technology, design, engineering and business operations | IT Services and IT Consulting | 🇫🇷 Paris | 342,989 |  |
| 4 | [KPMG Italy](https://www.tamtam.ai/c/kpmg-italy) (kpmg.com)<br>A global professional services network providing audit, advisory, tax, and legal services to businesses worldwide, focusing on building trust and driving change | Business Consulting and Services | 🇮🇹 Milan | 265,000 | 1987 |
| 5 | [Adecco](https://www.tamtam.ai/c/adecco) (adecco.com)<br>Top provider of HR solutions matching talented individuals with job opportunities worldwide, offering industry insight, training, and mentoring for career development | Staffing and Recruiting | 🇨🇭 Zurich | 199,071 |  |
| 6 | [Allianz Services](https://www.tamtam.ai/c/allianz-services) (careers.allianz.com)<br>Provides specialized core insurance operations, shared services, business analytics, engineering, and management consulting to drive client experience within a global insurance group. | Financial Services | 🇩🇪 Munich | 159,000 |  |
| 7 | [FUJITSU](https://www.tamtam.ai/c/fujitsu) (global.fujitsu)<br>Leading global information and communication technology company, offering technology products, solutions, and services, connecting people, technology, and ideas for a sustainable world. | IT Services and IT Consulting | 🇬🇧 | 124,000 | 1935 |
| 8 | [G4S](https://www.tamtam.ai/c/g4s) (g4s.com)<br>A leading security and facility services company providing proactive security services, cutting-edge technology, and integrated solutions to help clients focus on their core business | Security and Investigations | 🇬🇧 London | 116,486 | 1901 |
| 9 | [Aon](https://www.tamtam.ai/c/aon) (aon.com)<br>The company provides advice and solutions to clients worldwide, helping them make better decisions to protect and grow their business | Financial Services | 🇬🇧 London | 93,574 |  |
| 10 | [SGS](https://www.tamtam.ai/c/sgs) (sgs.com)<br>Leading global company providing testing, inspection, and certification services to help organizations achieve high standards of quality, compliance, and sustainability. | Professional Services | 🇨🇭 Baar | 74,385 |  |
| 11 | [ISS A/S](https://www.tamtam.ai/c/iss-a-s) (issworld.com)<br>A workplace experience and facility management company that provides placemaking solutions for better business performance and enjoyable work environments | Facilities Services | 🇩🇰 Copenhagen | 64,283 |  |
| 12 | [WTW](https://www.tamtam.ai/c/wtw) (wtwco.com)<br>Offering data-driven solutions in people, risk, and capital areas, leveraging global expertise to enhance strategy, resilience, workforce motivation, and performance | Financial Services | 🇬🇧 London | 55,656 |  |
| 13 | [Bureau Veritas](https://www.tamtam.ai/c/bureau-veritas) (bureauveritas.com)<br>A global leader in testing, inspection, and certification services, fostering confidence through expertise and independence while addressing crucial societal and environmental challenges | Environmental Services | 🇫🇷 Paris | 55,072 | 1828 |
| 14 | [Almaviva Group](https://www.tamtam.ai/c/almaviva-group) (almavivagroup.com)<br>Provides digital innovation and ICT solutions globally, supporting business model transformation and competitiveness across public and private sectors. | IT Services and IT Consulting | 🇮🇹 Rome | 52,112 | 2005 |
| 15 | [ALTRAD](https://www.tamtam.ai/c/altrad) (altrad.com)<br>Global provider of industrial services and equipment manufacturing, offering high-value solutions across energy, oil & gas, construction, and environmental sectors. | Environmental Services | 🇫🇷 Montpellier | 52,000 | 1985 |
| 16 | [BDO](https://www.tamtam.ai/c/bdo-brussels) (bdo.global)<br>Providing professional services globally with 1800 offices, focusing on quality, technology, and innovative solutions for long-term client value. | Accounting | 🇧🇪 Brussels | 51,974 |  |
| 17 | [DEKRA](https://www.tamtam.ai/c/dekra) (dekra.com)<br>DEKRA provides expert safety services worldwide, including vehicle inspection, claims services, industrial inspections, training, product certification, and sustainable solutions | Public Safety | 🇩🇪 Stuttgart | 49,000 |  |
| 18 | [Sopra Steria](https://www.tamtam.ai/c/sopra-steria) (soprasteria.com)<br>Offers consulting, digital services, and solutions, assisting large companies and organizations with digital transformation, improving competitiveness through technology and collaboration. | IT Services and IT Consulting | 🇫🇷 Paris | 47,609 |  |
| 19 | [Minsait](https://www.tamtam.ai/c/minsait) (minsait.com)<br>A leading Spanish technological consultant operating globally, leveraging cloud, security, payments, and innovative technology to drive business and societal impact #MoreMinsait | IT Services and IT Consulting | 🇪🇸 Alcobendas | 45,000 | 2016 |
| 20 | [Capgemini Engineering](https://www.tamtam.ai/c/capgemini-engineering) (capgemini.com)<br>Engineering R&D services, combining broad industry knowledge and cutting-edge digital and software technologies to accelerate clients' journey towards Intelligent Industry. | Engineering Services | 🇫🇷 Paris | 44,836 |  |
| 21 | [Arcadis](https://www.tamtam.ai/c/arcadis) (arcadis.com)<br>delivering transformative projects globally addressing climate, energy, and livable cities through design, engineering, architecture, and consulting for a better future | Professional Services | 🇳🇱 Amsterdam | 42,295 |  |
| 22 | [Mazars](https://www.tamtam.ai/c/mazars-paris-la-defense) (forvismazars.com)<br>Global integrated partnership providing audit, accountancy, advisory, tax, and legal services through fifty thousand professionals across more than one hundred countries worldwide. | Accounting | 🇫🇷 Paris La Defense | 42,000 | 1945 |
| 23 | [Publicis Groupe](https://www.tamtam.ai/c/publicis-groupe) (publicisgroupe.com)<br>Helps clients transform their marketing and digital businesses, providing expertise in communications, media, data, and technology across 100+ countries. | Advertising Services | 🇫🇷 Paris | 41,020 |  |
| 24 | [ALTEN](https://www.tamtam.ai/c/alten) (alten.com)<br>Provides engineering and IT services, supporting businesses in technological and sustainable transformation across various industries with high-level consultant-engineers. | Engineering Services | 🇫🇷 Boulogne-Billancourt | 38,710 | 1988 |
| 25 | [ICON plc](https://www.tamtam.ai/c/icon-plc) (iconplc.com)<br>A global company founded in Ireland in 1990, specializing in accelerating the development of drugs and devices to save lives and improve quality of life | Biotechnology Research | 🇮🇪 Dublin | 35,001 |  |
| 26 | [Serco](https://www.tamtam.ai/c/serco-hook) (serco.com)<br>Innovative solutions for global challenges in justice, migration, defense, space, health, and transport through service design, program management, and systems integration | IT Services and IT Consulting | 🇬🇧 Hook | 32,618 |  |
| 27 | [NTT DATA Europe & Latam](https://www.tamtam.ai/c/ntt-data-europe-and-latam) (nttdata.com)<br>Global IT services provider transforming clients through consulting, solutions, and managed services to enable a confident move into the digital future | IT Services and IT Consulting | 🇪🇸 Madrid | 31,932 |  |
| 28 | [Hays](https://www.tamtam.ai/c/hays) (haysplc.com)<br>Specialist recruitment and workforce solutions provider offering advisory services, career transitions, and employer brand positioning, with a focus on empowering people and businesses to succeed globally | Staffing and Recruiting | 🇬🇧 London | 31,854 |  |
| 29 | [Webhelp](https://www.tamtam.ai/c/webhelp) (webhelp.com)<br>The company specializes in creating innovative customer journeys using data insights, AI, and human talent to drive growth for brands worldwide | Outsourcing and Offshoring Consulting | 🇫🇷 Paris | 27,162 |  |
| 30 | [Arup](https://www.tamtam.ai/c/arup) (arup.com)<br>A global collective of designers and consultants dedicated to sustainable development, collaborating with clients to shape a better world using technology and imagination | Design Services | 🇬🇧 London | 26,193 | 1946 |
| 31 | [Capita](https://www.tamtam.ai/c/capita) (capita.com)<br>A leading provider of business services using data, technology, and people to simplify connections between governments, citizens, businesses, and customers | IT Services and IT Consulting | 🇬🇧 London | 25,581 | 1984 |
| 32 | [Kantar](https://www.tamtam.ai/c/kantar) (kantar.com)<br>Global leader in marketing data and analytics with deep expertise, innovative technology, and insights to help clients understand people and drive growth worldwide | Market Research | 🇬🇧 London | 24,976 |  |
| 33 | [Eurofins](https://www.tamtam.ai/c/eurofins) (eurofins.com)<br>An international life sciences company offering analytical testing services in food, environmental, pharmaceutical, and cosmetic industries, ensuring safety and authenticity | Biotechnology Research | 🇱🇺 Luxembourg | 24,896 |  |
| 34 | [Mott MacDonald](https://www.tamtam.ai/c/mott-macdonald) (mottmac.com)<br>The company focuses on improving society through digital innovation, excellence, and solving intricate challenges with clients to deliver better outcomes | Civil Engineering | 🇬🇧 London | 24,653 | 1989 |
| 35 | [Sweco](https://www.tamtam.ai/c/sweco) (swecogroup.com)<br>A leading consultancy co-creating sustainable solutions for urban areas through planning, design, and digital innovation with a team of 21,000 specialists | Professional Services | 🇸🇪 Stockholm | 22,591 |  |
| 36 | [Inetum](https://www.tamtam.ai/c/inetum) (inetum.com)<br>European digital services leader helping businesses, public sector, and society with digital impact, performance, and innovation, partnering with major software publishers. | IT Services and IT Consulting | 🇫🇷 Saint-Ouen | 21,788 | 1970 |
| 37 | [Computacenter](https://www.tamtam.ai/c/computacenter) (computacenter.com)<br>A leading technology and services provider, trusted by large organizations, helping customers manage and transform their technology infrastructure for digital transformation | IT Services and IT Consulting | 🇬🇧 Hatfield | 20,070 | 1981 |
| 38 | [Applus+](https://www.tamtam.ai/c/applus) (applus.com)<br>A global leader in testing, inspection, and certification services, providing innovative solutions for asset integrity, regulatory compliance, and environmental performance | Business Consulting and Services | 🇪🇸 Madrid | 20,046 |  |
| 39 | [AFRY](https://www.tamtam.ai/c/afry) (afry.com)<br>A European leader in engineering, design, and advisory services, accelerating the transition to a sustainable society through global expertise in infrastructure, industry, energy, and digitalization | Engineering Services | 🇸🇪 Stockholm | 19,737 |  |
| 40 | [The Adecco Group](https://www.tamtam.ai/c/the-adecco-group) (adeccogroup.com)<br>Global talent company providing employability, digital and engineering solutions, and workforce optimization across multiple industries and countries. | Human Resources Services | 🇨🇭 Zurich | 19,418 |  |
| 41 | [Bilfinger](https://www.tamtam.ai/c/bilfinger) (bilfinger.com)<br>An international industrial services provider specializing in increasing efficiency and sustainability for process industry customers through a comprehensive range of services | Industrial Machinery Manufacturing | 🇩🇪 Mannheim | 18,940 |  |
| 42 | [Technip Energies](https://www.tamtam.ai/c/technip-energies) (ten.com)<br>Leading energy engineering & technology company focused on LNG, hydrogen, ethylene, sustainable chemistry, and CO2 management Committed to accelerating the energy transition globally | Engineering Services | 🇫🇷 Paris | 18,645 |  |
| 43 | [EY-Parthenon](https://www.tamtam.ai/c/ey-parthenon) (ey.com)<br>Multidisciplinary professionals across 120 countries provide actionable corporate, transaction, and turnaround strategies to clients using data analytics and digital capabilities | Business Consulting and Services | 🇬🇧 London | 18,536 |  |
| 44 | [Ramboll](https://www.tamtam.ai/c/ramboll) (ramboll.com)<br>Global company offering sustainable solutions in architecture, engineering, and consultancy across various sectors to create sustainable cities and societies worldwide | Engineering Services | 🇩🇰 Copenhagen | 18,506 | 1945 |
| 45 | [TÜV SÜD](https://www.tamtam.ai/c/tuv-sud) (tuvsud.com)<br>Experts provide testing, certification, auditing, and advisory services across various industries, ensuring safety, security, and sustainability for technological advancements and market access. | Public Safety | 🇩🇪 Munich | 18,205 | 1866 |
| 46 | [Reply](https://www.tamtam.ai/c/reply) (reply.com)<br>Specializing in innovative solutions using AI, big data, and digital media, this company delivers consulting and digital services across various sectors globally | IT Services and IT Consulting | 🇮🇹 Turin | 17,188 | 1996 |
| 47 | [Capgemini Invent](https://www.tamtam.ai/c/capgemini-invent) (capgemini.com)<br>Digital innovation, consulting, and transformation services combining strategy, technology, data science, and creative design to help businesses envision and build the future | Business Consulting and Services | 🇫🇷 Paris | 17,000 |  |
| 48 | [BCD Travel](https://www.tamtam.ai/c/bcd-travel) (bcdtravel.com)<br>Comprehensive corporate travel management with digital tools, meetings and events services, global consultancy, supporting cost savings and sustainability worldwide. | Travel Arrangements | 🇳🇱 Utrecht | 16,897 | 2006 |
| 49 | [ELIS](https://www.tamtam.ai/c/elis-puteaux) (elis.com)<br>A global provider of circular services for hygiene and well-being, offering solutions for various sectors while promoting environmental sustainability and customer focus | Facilities Services | 🇫🇷 Puteaux | 15,750 | 1883 |
| 50 | [Michael Page](https://www.tamtam.ai/c/michael-page) (redirect.michaelpage.com)<br>Professional services recruitment with specialized teams offering local market knowledge and international network support across multiple industries and regions. | Staffing and Recruiting | 🇬🇧 Addlestone | 15,725 |  |
| 51 | [Bluesky Agency](https://www.tamtam.ai/c/bluesky-agency) (fabiotoffanin.it)<br>An Italian agency based in Venice offering services for public and private boards, seeking partners to develop a Smart Tourism Network | International Affairs | 🇮🇹 Venice | 15,612 | 1980 |
| 52 | [Sendiri](https://www.tamtam.ai/c/sendiri) (sendiri.nl)<br>Learning and development consultancy specializing in online programs, community support, and guidance to empower individuals and organizations in enhancing skills and knowledge | Professional Training and Coaching | 🇳🇱 Eefde | 15,445 | 2018 |
| 53 | [Luxoft](https://www.tamtam.ai/c/luxoft) (luxoft.com)<br>A global digital strategy and software engineering firm, part of DXC Technology, offering bespoke technology solutions to drive business innovation worldwide | IT Services and IT Consulting | 🇨🇭 Zug | 15,420 |  |
| 54 | [Egis](https://www.tamtam.ai/c/egis) (egis-group.com)<br>An international consultancy specializing in sustainable infrastructure, construction engineering, and mobility services, working towards achieving carbon neutrality and social development globally | Civil Engineering | 🇫🇷 Saint-Quentin-en-Yvelines | 15,158 |  |
| 55 | [KPMG UK](https://www.tamtam.ai/c/kpmg-uk) (kpmg.com)<br>A leading UK provider of tax, audit, and advisory services with a global presence, focusing on innovative solutions and expertise for clients' needs | Business Consulting and Services | 🇬🇧 London | 15,102 | 1987 |
| 56 | [Studio legale](https://www.tamtam.ai/c/studio-legale) (studiocorriaslucente.it)<br>Legal office specializing in criminal law, providing legal representation and advice | Legal Services | 🇮🇹 | 15,087 |  |
| 57 | [Bechtle](https://www.tamtam.ai/c/bechtle) (bechtle.com)<br>A leading IT provider in Europe, offering IT infrastructure solutions to over 70,000 customers in various sectors with 85 system houses across 14 countries | IT Services and IT Consulting | 🇩🇪 Neckarsulm | 15,000 | 1983 |
| 58 | [Onet SA](https://www.tamtam.ai/c/onet-sa) (groupeonet.com)<br>A family service group with 74,000 employees in 8 countries, offering a wide range of services including cleaning, security, engineering, and maintenance | Business Consulting and Services | 🇫🇷 Marseille | 14,750 | 1860 |
| 59 | [Petrofac](https://www.tamtam.ai/c/petrofac) (petrofac.com)<br>International energy service provider specializing in designing, building, managing, and maintaining oil, gas, refining, and renewable energy infrastructure for leading energy companies worldwide | Engineering Services | 🇬🇧 London | 14,616 | 1981 |
| 60 | [Cloud Consulting](https://www.tamtam.ai/c/cloud-consulting) (ccltng.com)<br>Oversees national education policies, youth programs, and administration to support learning and development across France. | IT Services and IT Consulting | 🇬🇧 London | 14,588 |  |
| 61 | [Expleo Group](https://www.tamtam.ai/c/expleo-group) (expleo.com)<br>Global provider partners with organisations to guide business transformation, achieve operational excellence, and future-proof businesses through engineering, technology, and consulting services. | IT Services and IT Consulting | 🇫🇷 Saint Quentin en Yvelines | 14,116 | 1966 |
| 62 | [Savills](https://www.tamtam.ai/c/savills) (savills.com)<br>Global real estate advisory firm providing tailored solutions and expert advice for residential and commercial property clients worldwide. | Real Estate | 🇬🇧 London | 13,891 |  |
| 63 | [Smollan](https://www.tamtam.ai/c/smollan) (smollan.com)<br>Partners with brands and retailers, building solutions that drive growth and create opportunities at the point of purchase. | Retail | 🇬🇧 London | 13,502 | 1931 |
| 64 | [GFT Technologies](https://www.tamtam.ai/c/gft-technologies) (gft.com)<br>Design advanced data, AI transformation solutions, modernize tech architectures, and develop next-gen core systems for industry leaders globally. | IT Services and IT Consulting | 🇩🇪 Stuttgart | 13,400 | 1987 |
| 65 | [FLSmidth](https://www.tamtam.ai/c/flsmidth) (fls.com)<br>A global supplier to the mining and cement industries, FLSmidth offers technology and services to improve performance, reduce costs, and minimize environmental impact | Industrial Machinery Manufacturing | 🇩🇰 Copenhagen | 12,984 | 1882 |
| 66 | [Rentokil Initial](https://www.tamtam.ai/c/rentokil-initial) (rentokil-initial.com)<br>Global provider of pest control, hygiene, and well-being services protecting people and enhancing lives for commercial and private customers. | Environmental Services | 🇬🇧 Crawley | 12,515 | 1925 |
| 67 | [RSK Group](https://www.tamtam.ai/c/rsk-group) (rskgroup.com)<br>Global provider of environmental consultancy and engineering services, integrating innovation and multidisciplinary collaboration to address complex sustainability challenges. | Environmental Services | 🇬🇧 Helsby | 12,442 |  |
| 68 | [Tecnicas Reunidas](https://www.tamtam.ai/c/tecnicas-reunidas) (tecnicasreunidas.es)<br>An international general contractor specializing in engineering and construction of industrial facilities in oil & gas, refining, power generation, infrastructures, and energy transition | Engineering Services | 🇪🇸 Madrid | 12,368 | 1960 |
| 69 | [Tieto](https://www.tamtam.ai/c/tieto) (tieto.com)<br>Providing software and technology consulting services focused on creating lasting impact and delivering effective solutions for clients. | Technology, Information and Internet | 🇫🇮 | 12,353 | 1968 |
| 70 | [Grupo Tragsa](https://www.tamtam.ai/c/grupo-tragsa) (tragsa.es)<br>Provides engineering, technical assistance, and execution of projects for public administrations in agriculture, environment, and rural development sectors. | Environmental Services | 🇪🇸 Madrid | 12,239 | 1977 |
| 71 | [Law firm](https://www.tamtam.ai/c/law-firm) (xx)<br>Specializes in aviation-related contracts focusing on civil aircraft engine maintenance and worldwide engine leasing services for clients. | Law Practice | 🇪🇸 | 12,081 |  |
| 72 | [Bechtle Schweiz AG](https://www.tamtam.ai/c/bechtle-schweiz-ag) (bechtle.com)<br>Leading IT service provider for SMEs, large customers, and public institutions, offering consulting, infrastructure, cloud, services, and software solutions throughout the entire IT life cycle. | IT Services and IT Consulting | 🇨🇭 Mägenwil | 12,000 | 1983 |
| 73 | [SoftwareOne](https://www.tamtam.ai/c/softwareone) (softwareone.com)<br>Global provider of software and cloud solutions, specializing in migration, modernization, and optimization for clients worldwide Headquartered in Switzerland | IT Services and IT Consulting | 🇨🇭 Stans | 11,985 |  |
| 74 | [Altran](https://www.tamtam.ai/c/altran) (capgemini-engineering.com)<br>Altran, now Capgemini Engineering, offers engineering services Follow them on LinkedIn for updates and insights | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 11,652 |  |
| 75 | [PwC Deutschland](https://www.tamtam.ai/c/pwc-deutschland) (pwc.de)<br>A leading auditing and consulting firm in Germany, offering services worldwide with expertise in assurance, tax, legal, deals, and strategy advisory | Business Consulting and Services | 🇩🇪 Frankfurt | 11,566 |  |
| 76 | [SEGULA Technologies](https://www.tamtam.ai/c/segula-technologies) (segulatechnologies.com)<br>Provides global engineering services across major industrial sectors, committed to innovation, from research to industrialization and production. | Engineering Services | 🇫🇷 Nanterre | 11,442 |  |
| 77 | [Ayesa](https://www.tamtam.ai/c/ayesa) (ayesa.com)<br>Global provider of technology and engineering services with expertise in digital solutions, infrastructure design, and supervision for private and public sectors worldwide | Business Consulting and Services | 🇪🇸 Seville | 11,405 | 1966 |
| 78 | [ADMR](https://www.tamtam.ai/c/admr) (admr.org)<br>The company is a French network providing personalized, reliable, and quality in-home services from birth to end of life through local associations | Individual and Family Services | 🇫🇷 Paris | 11,291 | 1945 |
| 79 | [TMF Group](https://www.tamtam.ai/c/tmf-group) (tmf-group.com)<br>Provides global administrative, financial, and legal support, helping companies navigate complex regulations and operate safely across numerous international markets. | Financial Services | 🇳🇱 Amsterdam | 11,186 | 1988 |
| 80 | [Equans France](https://www.tamtam.ai/c/equans-france) (equans.fr)<br>Designs, installs, and delivers bespoke solutions optimizing equipment and usage for businesses, local authorities, and industrial players in energy, industrial, and digital transitions. | Environmental Services | 🇫🇷 Courbevoie | 11,029 | 2021 |
| 81 | [Amey](https://www.tamtam.ai/c/amey) (amey.com)<br>A leading provider of engineering, operations, and decarbonisation solutions for transport infrastructure and complex facilities, focusing on sustainability and resilience | Civil Engineering | 🇬🇧 London | 11,000 |  |
| 82 | [PwC UK](https://www.tamtam.ai/c/pwc-uk) (pwc.co.uk)<br>Professional services firm focusing on building trust in society and solving important problems through partnership and commercial expertise. | Accounting | 🇬🇧 London | 10,873 |  |
| 83 | [Social Group - socialgroup.ch](https://www.tamtam.ai/c/social-group-socialgroup-ch) (socialgroup.ch)<br>Optimizing digital business ecosystems, enhancing LinkedIn presence for sustainable growth, measurable success, and maximum efficiency in sales and recruiting. | Business Consulting and Services | 🇨🇭 Wallisellen | 10,803 | 2012 |
| 84 | [Sogeti](https://www.tamtam.ai/c/sogeti) (sogeti.com)<br>Helps organizations with technology solutions, implements innovation quickly, focuses on quality engineering, cloud, application development through AI, data, and automation. | IT Services and IT Consulting | 🇫🇷 Paris | 10,781 | 1967 |
| 85 | [T-Systems International](https://www.tamtam.ai/c/t-systems-international) (t-systems.com)<br>Provides end-to-end IT solutions, cloud migration, and industry-specific digital transformation services with strong security and global presence. | IT Services and IT Consulting | 🇩🇪 Frankfurt | 10,768 | 2000 |
| 86 | [Devoteam](https://www.tamtam.ai/c/devoteam) (devoteam.com)<br>AI-driven tech consulting firm specializing in cloud platforms, cyber, data, and sustainability, guiding businesses through sustainable digital transformation to deliver value. | Business Consulting and Services | 🇫🇷 Levallois-Perret | 10,274 |  |
| 87 | [SYSTRA](https://www.tamtam.ai/c/systra) (systra.com)<br>Leading engineering and consultancy group specializing in public transport and mobility solutions, connecting people and regions through transport infrastructure development. | Engineering Services | 🇫🇷 Paris | 10,162 |  |
| 88 | [BearingPoint](https://www.tamtam.ai/c/bearingpoint) (bearingpoint.com)<br>Independent consulting firm offering tailored solutions for complex business environments, applying deep industry expertise to help clients achieve their goals globally | Business Consulting and Services | 🇳🇱 Amsterdam | 10,074 | 2002 |
| 89 | [BSI](https://www.tamtam.ai/c/bsi-london) (bsigroup.com)<br>A global organization with over 100 years of experience in shaping best practices, helping businesses achieve excellence, competence, and sustainable growth | Professional Services | 🇬🇧 London | 9,882 | 1901 |
| 90 | [Mace](https://www.tamtam.ai/c/mace) (macegroup.com)<br>Delivery consultancy and construction expertise for iconic buildings, data centres, life science, social infrastructure, and regeneration projects worldwide. | Construction | 🇬🇧 London | 9,872 | 1990 |
| 91 | [KPMG Deutschland](https://www.tamtam.ai/c/kpmg-deutschland) (kpmg.com)<br>Providing audit, tax, consulting, and deal advisory services with interdisciplinary teams specializing in key industries across multiple locations. | Business Consulting and Services | 🇩🇪 Berlin | 9,823 |  |
| 92 | [Atkins](https://www.tamtam.ai/c/atkins) (atkinsrealis.com)<br>World-class engineering services and nuclear organization connecting people, data, and technology to transform global infrastructure and energy systems through design and management. | Engineering Services | 🇬🇧 Epsom | 9,798 |  |
| 93 | [Apave](https://www.tamtam.ai/c/apave) (apave.com)<br>Specializes in technical, human, environmental, and digital risk management, ensuring safety and performance across various economic sectors for over 150 years. | Environmental Services | 🇫🇷 Courbevoie | 9,778 | 1867 |
| 94 | [Endava](https://www.tamtam.ai/c/endava) (endava.com)<br>The company leverages technology and expertise to drive innovation and transform businesses with customized digital solutions across industries | IT Services and IT Consulting | 🇬🇧 London | 9,559 | 2020 |
| 95 | [Forvis Mazars Group](https://www.tamtam.ai/c/forvis-mazars-group) (forvismazars.com)<br>International partnership delivering audit, tax, and advisory services across one hundred countries and territories through an integrated global professional services network. | Accounting | 🇫🇷 Levallois-Perret | 9,534 |  |
| 96 | [Tietoevry](https://www.tamtam.ai/c/tietoevry) (tieto.com)<br>Creating purposeful technology to reinvent the world for good, focusing on the future of businesses, societies, and humanity | IT Services and IT Consulting | 🇫🇮 Helsinki | 9,343 |  |
| 97 | [Apex Group Ltd (UK & Ireland)](https://www.tamtam.ai/c/apex-group-ltd-uk-and-ireland) (apexgroup.com)<br>A global financial services provider with offices in over 50 countries, offering a wide range of services to asset managers, capital markets, and family offices | Financial Services | 🇬🇧 London | 9,281 | 2003 |
| 98 | [AMS](https://www.tamtam.ai/c/ams) (weareams.com)<br>Global talent solutions business specializing in sourcing, selecting, and retaining top talent through digital innovation, HR expertise, and a holistic approach to workforce management | Human Resources Services | 🇬🇧 London | 8,718 | 1996 |
| 99 | [SCC](https://www.tamtam.ai/c/scc) (scc.com)<br>SCC is a leading IT group in Europe, providing limitless IT solutions, cyber security services, digital workplace solutions, and hybrid infrastructure services | IT Services and IT Consulting | 🇬🇧 Birmingham | 8,687 | 1975 |
| 100 | [COWI](https://www.tamtam.ai/c/cowi) (cowi.com)<br>The company creates sustainable solutions with a focus on improving quality of life for present and future generations through engineering and architecture expertise | Civil Engineering | 🇩🇰 Lyngby | 8,647 | 1930 |

## 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 Europe

- [The largest companies in Europe](https://www.tamtam.ai/l/largest-companies-in-europe) (213,526)
- [Multinational companies in Europe](https://www.tamtam.ai/l/multinational-companies-in-europe) (42,019)
- [Companies with in-house R&D in Europe](https://www.tamtam.ai/l/r-and-d-companies-in-europe) (20,166)
- [Retail chains in Europe](https://www.tamtam.ai/l/retail-chains-in-europe) (19,258)
- [Manufacturers in Europe](https://www.tamtam.ai/l/manufacturers-in-europe) (18,151)
- [SaaS companies in Europe](https://www.tamtam.ai/l/saas-companies-in-europe) (13,682)
- [Software Development companies in Europe](https://www.tamtam.ai/l/software-development-companies-in-europe) (12,950)
- [Financial services firms in Europe](https://www.tamtam.ai/l/financial-services-firms-in-europe) (12,941)
- [IT Services and IT Consulting companies in Europe](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-in-europe) (11,704)
- [IT services companies in Europe](https://www.tamtam.ai/l/it-services-companies-in-europe) (11,376)
- [Hardware manufacturers in Europe](https://www.tamtam.ai/l/hardware-companies-in-europe) (10,563)
- [Family-owned companies in Europe](https://www.tamtam.ai/l/family-owned-companies-in-europe) (9,878)
- [Critical infrastructure operators in Europe](https://www.tamtam.ai/l/critical-infrastructure-operators-in-europe) (9,815)
- [Financial Services companies in Europe](https://www.tamtam.ai/l/financial-services-companies-in-europe) (9,479)
- [Consulting firms in Europe](https://www.tamtam.ai/l/consulting-firms-in-europe) (8,900)
- [Public sector organisations in Europe](https://www.tamtam.ai/l/public-sector-organisations-in-europe) (8,565)
- [Education providers in Europe](https://www.tamtam.ai/l/education-companies-in-europe) (7,925)
- [Companies with a mobile app in Europe](https://www.tamtam.ai/l/companies-with-mobile-app-in-europe) (7,899)
- [Distributors and wholesalers in Europe](https://www.tamtam.ai/l/distributors-and-wholesalers-in-europe) (7,573)
- [Retail companies in Europe](https://www.tamtam.ai/l/retail-companies-in-europe) (6,240)
- [Healthcare providers in Europe](https://www.tamtam.ai/l/healthcare-providers-in-europe) (6,132)
- [E-commerce companies in Europe](https://www.tamtam.ai/l/ecommerce-companies-in-europe) (5,864)
- [Hotel and hospitality groups in Europe](https://www.tamtam.ai/l/hospitality-groups-in-europe) (5,739)
- [Subscription businesses in Europe](https://www.tamtam.ai/l/subscription-businesses-in-europe) (5,640)

## The same list elsewhere

- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)
- [Professional services firms in France](https://www.tamtam.ai/l/professional-services-firms-france) (6,610)
- [Professional services firms in the United Kingdom](https://www.tamtam.ai/l/professional-services-firms-united-kingdom) (2,706)
- [Professional services firms in the Netherlands](https://www.tamtam.ai/l/professional-services-firms-netherlands) (739)
- [Professional services firms in Germany](https://www.tamtam.ai/l/professional-services-firms-germany) (690)
- [Professional services firms in Spain](https://www.tamtam.ai/l/professional-services-firms-spain) (523)
- [Professional services firms in Switzerland](https://www.tamtam.ai/l/professional-services-firms-switzerland) (402)
- [Professional services firms in Italy](https://www.tamtam.ai/l/professional-services-firms-italy) (398)
- [Professional services firms in Belgium](https://www.tamtam.ai/l/professional-services-firms-belgium) (396)
- [Professional services firms in Sweden](https://www.tamtam.ai/l/professional-services-firms-sweden) (194)
- [Professional services firms in Denmark](https://www.tamtam.ai/l/professional-services-firms-denmark) (150)
- [Professional services firms in Poland](https://www.tamtam.ai/l/professional-services-firms-poland) (149)
- [Professional services firms in Ireland](https://www.tamtam.ai/l/professional-services-firms-ireland) (126)
- [Professional services firms in Norway](https://www.tamtam.ai/l/professional-services-firms-norway) (116)
- [Professional services firms in Portugal](https://www.tamtam.ai/l/professional-services-firms-portugal) (91)
- [Professional services firms in Finland](https://www.tamtam.ai/l/professional-services-firms-finland) (79)
- [Professional services firms in Austria](https://www.tamtam.ai/l/professional-services-firms-austria) (58)
- [Professional services firms in Luxembourg](https://www.tamtam.ai/l/professional-services-firms-luxembourg) (56)
- [Professional services firms in the Czech Republic](https://www.tamtam.ai/l/professional-services-firms-czech-republic) (35)
- [Professional services firms in Ukraine](https://www.tamtam.ai/l/professional-services-firms-ukraine) (31)

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Source: https://www.tamtam.ai/l/professional-services-firms-in-europe