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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).

馃實 Europe100 companiesUpdated Nov 13, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
Randstadrandstad.com

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 馃嚦馃嚤 Diemen 653,000 1960
2
EYey.com

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 馃嚞馃嚙 London 404,207 n/a
3
Capgeminicapgemini.com

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 馃嚝馃嚪 Paris 342,989 n/a
4
KPMG Italykpmg.com

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 馃嚠馃嚬 Milan 265,000 1987
5
Adeccoadecco.com

Top provider of HR solutions matching talented individuals with job opportunities worldwide, offering industry insight, training, and mentoring for career development

Staffing and Recruiting 馃嚚馃嚟 Zurich 199,071 n/a
6
Allianz Servicescareers.allianz.com

Provides specialized core insurance operations, shared services, business analytics, engineering, and management consulting to drive client experience within a global insurance group.

Financial Services 馃嚛馃嚜 Munich 159,000 n/a
7
FUJITSUglobal.fujitsu

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 馃嚞馃嚙 124,000 1935
8
G4Sg4s.com

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 馃嚞馃嚙 London 116,486 1901
9
Aonaon.com

The company provides advice and solutions to clients worldwide, helping them make better decisions to protect and grow their business

Financial Services 馃嚞馃嚙 London 93,574 n/a
10
SGSsgs.com

Leading global company providing testing, inspection, and certification services to help organizations achieve high standards of quality, compliance, and sustainability.

Professional Services 馃嚚馃嚟 Baar 74,385 n/a
11
ISS A/Sissworld.com

A workplace experience and facility management company that provides placemaking solutions for better business performance and enjoyable work environments

Facilities Services 馃嚛馃嚢 Copenhagen 64,283 n/a
12
WTWwtwco.com

Offering data-driven solutions in people, risk, and capital areas, leveraging global expertise to enhance strategy, resilience, workforce motivation, and performance

Financial Services 馃嚞馃嚙 London 55,656 n/a
13
Bureau Veritasbureauveritas.com

A global leader in testing, inspection, and certification services, fostering confidence through expertise and independence while addressing crucial societal and environmental challenges

Environmental Services 馃嚝馃嚪 Paris 55,072 1828
14
Almaviva Groupalmavivagroup.com

Provides digital innovation and ICT solutions globally, supporting business model transformation and competitiveness across public and private sectors.

IT Services and IT Consulting 馃嚠馃嚬 Rome 52,112 2005
15
ALTRADaltrad.com

Global provider of industrial services and equipment manufacturing, offering high-value solutions across energy, oil & gas, construction, and environmental sectors.

Environmental Services 馃嚝馃嚪 Montpellier 52,000 1985
16
BDObdo.global

Providing professional services globally with 1800 offices, focusing on quality, technology, and innovative solutions for long-term client value.

Accounting 馃嚙馃嚜 Brussels 51,974 n/a
17
DEKRAdekra.com

DEKRA provides expert safety services worldwide, including vehicle inspection, claims services, industrial inspections, training, product certification, and sustainable solutions

Public Safety 馃嚛馃嚜 Stuttgart 49,000 n/a
18
Sopra Steriasoprasteria.com

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 馃嚝馃嚪 Paris 47,609 n/a
19
Minsaitminsait.com

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 馃嚜馃嚫 Alcobendas 45,000 2016
20
Capgemini Engineeringcapgemini.com

Engineering R&D services, combining broad industry knowledge and cutting-edge digital and software technologies to accelerate clients' journey towards Intelligent Industry.

Engineering Services 馃嚝馃嚪 Paris 44,836 n/a
21
Arcadisarcadis.com

delivering transformative projects globally addressing climate, energy, and livable cities through design, engineering, architecture, and consulting for a better future

Professional Services 馃嚦馃嚤 Amsterdam 42,295 n/a
22
Mazarsforvismazars.com

Global integrated partnership providing audit, accountancy, advisory, tax, and legal services through fifty thousand professionals across more than one hundred countries worldwide.

Accounting 馃嚝馃嚪 Paris La Defense 42,000 1945
23
Publicis Groupepublicisgroupe.com

Helps clients transform their marketing and digital businesses, providing expertise in communications, media, data, and technology across 100+ countries.

Advertising Services 馃嚝馃嚪 Paris 41,020 n/a
24
ALTENalten.com

Provides engineering and IT services, supporting businesses in technological and sustainable transformation across various industries with high-level consultant-engineers.

Engineering Services 馃嚝馃嚪 Boulogne-Billancourt 38,710 1988
25
ICON plciconplc.com

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 馃嚠馃嚜 Dublin 35,001 n/a
26
Sercoserco.com

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 馃嚞馃嚙 Hook 32,618 n/a
27
NTT DATA Europe & Latamnttdata.com

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 馃嚜馃嚫 Madrid 31,932 n/a
28
Hayshaysplc.com

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 馃嚞馃嚙 London 31,854 n/a
29
Webhelpwebhelp.com

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 馃嚝馃嚪 Paris 27,162 n/a
30
Aruparup.com

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 馃嚞馃嚙 London 26,193 1946
31
Capitacapita.com

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 馃嚞馃嚙 London 25,581 1984
32
Kantarkantar.com

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 馃嚞馃嚙 London 24,976 n/a
33
Eurofinseurofins.com

An international life sciences company offering analytical testing services in food, environmental, pharmaceutical, and cosmetic industries, ensuring safety and authenticity

Biotechnology Research 馃嚤馃嚭 Luxembourg 24,896 n/a
34
Mott MacDonaldmottmac.com

The company focuses on improving society through digital innovation, excellence, and solving intricate challenges with clients to deliver better outcomes

Civil Engineering 馃嚞馃嚙 London 24,653 1989
35
Swecoswecogroup.com

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 馃嚫馃嚜 Stockholm 22,591 n/a
36
Inetuminetum.com

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 馃嚝馃嚪 Saint-Ouen 21,788 1970
37
Computacentercomputacenter.com

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 馃嚞馃嚙 Hatfield 20,070 1981
38
Applus+applus.com

A global leader in testing, inspection, and certification services, providing innovative solutions for asset integrity, regulatory compliance, and environmental performance

Business Consulting and Services 馃嚜馃嚫 Madrid 20,046 n/a
39
AFRYafry.com

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 馃嚫馃嚜 Stockholm 19,737 n/a
40
The Adecco Groupadeccogroup.com

Global talent company providing employability, digital and engineering solutions, and workforce optimization across multiple industries and countries.

Human Resources Services 馃嚚馃嚟 Zurich 19,418 n/a
41
Bilfingerbilfinger.com

An international industrial services provider specializing in increasing efficiency and sustainability for process industry customers through a comprehensive range of services

Industrial Machinery Manufacturing 馃嚛馃嚜 Mannheim 18,940 n/a
42
Technip Energiesten.com

Leading energy engineering & technology company focused on LNG, hydrogen, ethylene, sustainable chemistry, and CO2 management Committed to accelerating the energy transition globally

Engineering Services 馃嚝馃嚪 Paris 18,645 n/a
43
EY-Parthenoney.com

Multidisciplinary professionals across 120 countries provide actionable corporate, transaction, and turnaround strategies to clients using data analytics and digital capabilities

Business Consulting and Services 馃嚞馃嚙 London 18,536 n/a
44
Rambollramboll.com

Global company offering sustainable solutions in architecture, engineering, and consultancy across various sectors to create sustainable cities and societies worldwide

Engineering Services 馃嚛馃嚢 Copenhagen 18,506 1945
45
T脺V S脺Dtuvsud.com

Experts provide testing, certification, auditing, and advisory services across various industries, ensuring safety, security, and sustainability for technological advancements and market access.

Public Safety 馃嚛馃嚜 Munich 18,205 1866
46
Replyreply.com

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 馃嚠馃嚬 Turin 17,188 1996
47
Capgemini Inventcapgemini.com

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 馃嚝馃嚪 Paris 17,000 n/a
48
BCD Travelbcdtravel.com

Comprehensive corporate travel management with digital tools, meetings and events services, global consultancy, supporting cost savings and sustainability worldwide.

Travel Arrangements 馃嚦馃嚤 Utrecht 16,897 2006
49
ELISelis.com

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 馃嚝馃嚪 Puteaux 15,750 1883
50
Michael Pageredirect.michaelpage.com

Professional services recruitment with specialized teams offering local market knowledge and international network support across multiple industries and regions.

Staffing and Recruiting 馃嚞馃嚙 Addlestone 15,725 n/a

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51
Bluesky Agencyfabiotoffanin.it

An Italian agency based in Venice offering services for public and private boards, seeking partners to develop a Smart Tourism Network

International Affairs 馃嚠馃嚬 Venice 15,612 1980
52
Sendirisendiri.nl

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 馃嚦馃嚤 Eefde 15,445 2018
53
Luxoftluxoft.com

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 馃嚚馃嚟 Zug 15,420 n/a
54
Egisegis-group.com

An international consultancy specializing in sustainable infrastructure, construction engineering, and mobility services, working towards achieving carbon neutrality and social development globally

Civil Engineering 馃嚝馃嚪 Saint-Quentin-en-Yvelines 15,158 n/a
55
KPMG UKkpmg.com

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 馃嚞馃嚙 London 15,102 1987
56
Studio legalestudiocorriaslucente.it

Legal office specializing in criminal law, providing legal representation and advice

Legal Services 馃嚠馃嚬 15,087 n/a
57
Bechtlebechtle.com

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 馃嚛馃嚜 Neckarsulm 15,000 1983
58
Onet SAgroupeonet.com

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 馃嚝馃嚪 Marseille 14,750 1860
59
Petrofacpetrofac.com

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 馃嚞馃嚙 London 14,616 1981
60
Cloud Consultingccltng.com

Oversees national education policies, youth programs, and administration to support learning and development across France.

IT Services and IT Consulting 馃嚞馃嚙 London 14,588 n/a
61
Expleo Groupexpleo.com

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 馃嚝馃嚪 Saint Quentin en Yvelines 14,116 1966
62
Savillssavills.com

Global real estate advisory firm providing tailored solutions and expert advice for residential and commercial property clients worldwide.

Real Estate 馃嚞馃嚙 London 13,891 n/a
63
Smollansmollan.com

Partners with brands and retailers, building solutions that drive growth and create opportunities at the point of purchase.

Retail 馃嚞馃嚙 London 13,502 1931
64
GFT Technologiesgft.com

Design advanced data, AI transformation solutions, modernize tech architectures, and develop next-gen core systems for industry leaders globally.

IT Services and IT Consulting 馃嚛馃嚜 Stuttgart 13,400 1987
65
FLSmidthfls.com

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 馃嚛馃嚢 Copenhagen 12,984 1882
66
Rentokil Initialrentokil-initial.com

Global provider of pest control, hygiene, and well-being services protecting people and enhancing lives for commercial and private customers.

Environmental Services 馃嚞馃嚙 Crawley 12,515 1925
67
RSK Grouprskgroup.com

Global provider of environmental consultancy and engineering services, integrating innovation and multidisciplinary collaboration to address complex sustainability challenges.

Environmental Services 馃嚞馃嚙 Helsby 12,442 n/a
68
Tecnicas Reunidastecnicasreunidas.es

An international general contractor specializing in engineering and construction of industrial facilities in oil & gas, refining, power generation, infrastructures, and energy transition

Engineering Services 馃嚜馃嚫 Madrid 12,368 1960
69
Tietotieto.com

Providing software and technology consulting services focused on creating lasting impact and delivering effective solutions for clients.

Technology, Information and Internet 馃嚝馃嚠 12,353 1968
70
Grupo Tragsatragsa.es

Provides engineering, technical assistance, and execution of projects for public administrations in agriculture, environment, and rural development sectors.

Environmental Services 馃嚜馃嚫 Madrid 12,239 1977
71
Law firmxx

Specializes in aviation-related contracts focusing on civil aircraft engine maintenance and worldwide engine leasing services for clients.

Law Practice 馃嚜馃嚫 12,081 n/a
72
Bechtle Schweiz AGbechtle.com

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 馃嚚馃嚟 M盲genwil 12,000 1983
73
SoftwareOnesoftwareone.com

Global provider of software and cloud solutions, specializing in migration, modernization, and optimization for clients worldwide Headquartered in Switzerland

IT Services and IT Consulting 馃嚚馃嚟 Stans 11,985 n/a
74
Altrancapgemini-engineering.com

Altran, now Capgemini Engineering, offers engineering services Follow them on LinkedIn for updates and insights

IT Services and IT Consulting 馃嚝馃嚪 Neuilly-sur-Seine 11,652 n/a
75
PwC Deutschlandpwc.de

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 馃嚛馃嚜 Frankfurt 11,566 n/a
76
SEGULA Technologiessegulatechnologies.com

Provides global engineering services across major industrial sectors, committed to innovation, from research to industrialization and production.

Engineering Services 馃嚝馃嚪 Nanterre 11,442 n/a
77
Ayesaayesa.com

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 馃嚜馃嚫 Seville 11,405 1966
78
ADMRadmr.org

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 馃嚝馃嚪 Paris 11,291 1945
79
TMF Grouptmf-group.com

Provides global administrative, financial, and legal support, helping companies navigate complex regulations and operate safely across numerous international markets.

Financial Services 馃嚦馃嚤 Amsterdam 11,186 1988
80
Equans Franceequans.fr

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 馃嚝馃嚪 Courbevoie 11,029 2021
81
Ameyamey.com

A leading provider of engineering, operations, and decarbonisation solutions for transport infrastructure and complex facilities, focusing on sustainability and resilience

Civil Engineering 馃嚞馃嚙 London 11,000 n/a
82
PwC UKpwc.co.uk

Professional services firm focusing on building trust in society and solving important problems through partnership and commercial expertise.

Accounting 馃嚞馃嚙 London 10,873 n/a
83
Social Group - socialgroup.chsocialgroup.ch

Optimizing digital business ecosystems, enhancing LinkedIn presence for sustainable growth, measurable success, and maximum efficiency in sales and recruiting.

Business Consulting and Services 馃嚚馃嚟 Wallisellen 10,803 2012
84
Sogetisogeti.com

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 馃嚝馃嚪 Paris 10,781 1967
85
T-Systems Internationalt-systems.com

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 馃嚛馃嚜 Frankfurt 10,768 2000
86
Devoteamdevoteam.com

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 馃嚝馃嚪 Levallois-Perret 10,274 n/a
87
SYSTRAsystra.com

Leading engineering and consultancy group specializing in public transport and mobility solutions, connecting people and regions through transport infrastructure development.

Engineering Services 馃嚝馃嚪 Paris 10,162 n/a
88
BearingPointbearingpoint.com

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 馃嚦馃嚤 Amsterdam 10,074 2002
89
BSIbsigroup.com

A global organization with over 100 years of experience in shaping best practices, helping businesses achieve excellence, competence, and sustainable growth

Professional Services 馃嚞馃嚙 London 9,882 1901
90
Macemacegroup.com

Delivery consultancy and construction expertise for iconic buildings, data centres, life science, social infrastructure, and regeneration projects worldwide.

Construction 馃嚞馃嚙 London 9,872 1990
91
KPMG Deutschlandkpmg.com

Providing audit, tax, consulting, and deal advisory services with interdisciplinary teams specializing in key industries across multiple locations.

Business Consulting and Services 馃嚛馃嚜 Berlin 9,823 n/a
92
Atkinsatkinsrealis.com

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 馃嚞馃嚙 Epsom 9,798 n/a
93
Apaveapave.com

Specializes in technical, human, environmental, and digital risk management, ensuring safety and performance across various economic sectors for over 150 years.

Environmental Services 馃嚝馃嚪 Courbevoie 9,778 1867
94
Endavaendava.com

The company leverages technology and expertise to drive innovation and transform businesses with customized digital solutions across industries

IT Services and IT Consulting 馃嚞馃嚙 London 9,559 2020
95
Forvis Mazars Groupforvismazars.com

International partnership delivering audit, tax, and advisory services across one hundred countries and territories through an integrated global professional services network.

Accounting 馃嚝馃嚪 Levallois-Perret 9,534 n/a
96
Tietoevrytieto.com

Creating purposeful technology to reinvent the world for good, focusing on the future of businesses, societies, and humanity

IT Services and IT Consulting 馃嚝馃嚠 Helsinki 9,343 n/a
97
Apex Group Ltd (UK & Ireland)apexgroup.com

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 馃嚞馃嚙 London 9,281 2003
98
AMSweareams.com

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 馃嚞馃嚙 London 8,718 1996
99
SCCscc.com

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 馃嚞馃嚙 Birmingham 8,687 1975
100
COWIcowi.com

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 馃嚛馃嚢 Lyngby 8,647 1930

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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 13, 2026.

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