# The 100 largest professional services firms in the world

Tamtam tracks 24,737 professional services firms worldwide. This list ranks the 100 largest by number of employees on LinkedIn, led by Tata Consultancy Services, Randstad and Deloitte. Their median headcount is 44,836. Half of them were founded in 1969 or later. The most common headquarters are London (9), New York (9) and Paris (6).

These are large professional services firms worldwide, primarily focusing on IT services, business consulting, and human resources. The companies listed are substantial in size, with employee counts ranging from over 100,000 to over 700,000.

Notable companies include Tata Consultancy Services, which provides technology services globally; Randstad, offering workforce solutions and HR advice; Deloitte, a global professional services firm; and EY, providing assurance, consulting, and tax services. Many of these firms, such as Capgemini and Concentrix, specialize in leveraging AI and technology for digital transformation and customer experience.

🌍 World · 100 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Tata Consultancy Services](https://www.tamtam.ai/c/tata-consultancy-services) (tcs.com)<br>Provides technology services worldwide, enabling client transformation across the AI stack, fostering innovation, engineering excellence, and customer service for adaptive enterprises. | IT Services and IT Consulting | 🇮🇳 Mumbai | 708,725 | 1968 |
| 2 | [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 |
| 3 | [Deloitte](https://www.tamtam.ai/c/deloitte) (deloitte.com)<br>Global professional services firm empowering diverse talents to drive progress for clients worldwide through advice, action, and integrity | Business Consulting and Services | 🇺🇸 Worldwide | 526,765 | 1845 |
| 4 | [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 |  |
| 5 | [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 |  |
| 6 | [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 |
| 7 | [KPMG](https://www.tamtam.ai/c/kpmg) (kpmg.com)<br>Global network of professional firms offering Audit, Tax and Advisory services in 146 countries Industry-focused professionals delivering value with clear vision and defined values | Accounting | 🇺🇸 Toronto | 265,000 |  |
| 8 | [Concentrix](https://www.tamtam.ai/c/concentrix) (concentrix.com)<br>Provides customer experience solutions and technology, improving business performance for global brands across various industries, creating better business outcomes. | IT Services and IT Consulting | 🇺🇸 Newark | 218,681 | 1983 |
| 9 | [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 |  |
| 10 | [TECH MAHINDRA](https://www.tamtam.ai/c/tech-mahindra) (techmahindra.com)<br>Tech Mahindra offers innovative IT experiences globally, leveraging next-gen technologies for digital transformation Part of Mahindra Group, driving sustainable business and societal change | IT Services and IT Consulting | 🇮🇳 Pune | 159,000 | 1986 |
| 11 | [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 |  |
| 12 | [Genpact](https://www.tamtam.ai/c/genpact) (genpact.com)<br>A global professional services firm with over 125,000 employees in 30+ countries, specializing in digital operations, data, technology, and AI solutions for leading enterprises | Business Consulting and Services | 🇺🇸 New York | 151,199 | 1997 |
| 13 | [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 |
| 14 | [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 |
| 15 | [JLL](https://www.tamtam.ai/c/jll) (jill.com)<br>A leading professional services firm specializing in real estate and investment management, creating rewarding opportunities and sustainable solutions using advanced technology | Real Estate | 🇺🇸 Chicago | 104,899 |  |
| 16 | [Allied Universal](https://www.tamtam.ai/c/allied-universal) (aus.com)<br>Provides tailored security and facility services using smart technology, supporting diverse sectors with local leadership and community presence. | Professional Services | 🇺🇸 Irvine | 104,797 |  |
| 17 | [LTIMindtree](https://www.tamtam.ai/c/ltimindtree) (ltm.com)<br>A global technology consulting company driving digital transformation for enterprises, delivering superior business outcomes through domain expertise and innovative digital solutions | IT Services and IT Consulting | 🇮🇳 Mumbai | 99,387 |  |
| 18 | [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 |  |
| 19 | [DXC Technology](https://www.tamtam.ai/c/dxc-technology) (dxc.com)<br>It assists global companies in managing critical systems, modernizing IT, optimizing data, and ensuring security across various cloud environments. | IT Services and IT Consulting | 🇺🇸 Ashburn | 90,597 | 2017 |
| 20 | [Kyndryl](https://www.tamtam.ai/c/kyndryl) (kyndryl.com)<br>A global leader in designing, running, and managing advanced technology infrastructure, focusing on excellence, innovation, and advancing vital systems for human progress | IT Services and IT Consulting | 🇺🇸 New York | 90,000 | 2021 |
| 21 | [Accenture in India](https://www.tamtam.ai/c/accenture-in-india) (accenture.com)<br>Global professional services company specializing in digital, cloud, and security solutions across 40+ industries with a focus on technology and human ingenuity for global clients | IT Services and IT Consulting | 🇮🇳 Bengaluru | 81,860 | 1989 |
| 22 | [Goldman Sachs](https://www.tamtam.ai/c/goldman-sachs) (goldmansachs.com)<br>Global financial institution providing expert capital markets services, investment banking, and asset management for clients through partnership, integrity, and world-class operational excellence. | Financial Services | 🇺🇸 New York | 76,000 |  |
| 23 | [CBRE](https://www.tamtam.ai/c/cbre) (cbre.com)<br>A real estate company providing comprehensive services and insights to empower clients in maximizing opportunities and success in the industry | Real Estate | 🇺🇸 Dallas | 75,008 |  |
| 24 | [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 |  |
| 25 | [ManpowerGroup](https://www.tamtam.ai/c/manpowergroup) (manpowergroup.com)<br>Global workforce solutions company sourcing, assessing, and managing talent for organizations worldwide, while providing sustainable employment opportunities across various industries and skills | Staffing and Recruiting | 🇺🇸 Milwaukee | 72,454 | 1948 |
| 26 | [Jacobs](https://www.tamtam.ai/c/jacobs) (jacobs.com)<br>Delivering outcomes and solutions for complex challenges in advanced manufacturing, cities, energy, environment, life sciences, transportation, and water, from advisory to lifecycle management. | Business Consulting and Services | 🇺🇸 Dallas | 68,461 | 1947 |
| 27 | [Compass Group USA](https://www.tamtam.ai/c/compass-group-usa) (compassgroupcareers.com)<br>Redefines food and facility services, delivering excellence to healthcare, education, cultural centers, sports venues, and corporations. Recognized for innovation, diversity, and trustworthiness. | Food and Beverage Services | 🇺🇸 Charlotte | 68,303 |  |
| 28 | [EPAM Systems](https://www.tamtam.ai/c/epam-systems) (epam.com)<br>Global digital transformation services provider specializing in product development and engineering, creating better enterprise, education, and health platforms worldwide | IT Services and IT Consulting | 🇺🇸 Newtown | 66,049 | 1993 |
| 29 | [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 |  |
| 30 | [WNS](https://www.tamtam.ai/c/wns) (wns.com)<br>Global provider of digital-led business transformation, combining industry knowledge, technology, analytics, and process expertise to deliver innovative solutions. | Business Consulting and Services | 🇺🇸 New York | 61,367 | 1996 |
| 31 | [Halliburton](https://www.tamtam.ai/c/halliburton) (halliburton.com)<br>Collaborates to engineer solutions maximizing energy asset value, from locating hydrocarbons, managing data, drilling, evaluating, and constructing wells, to optimizing production. | Oil and Gas | 🇺🇸 Houston | 60,277 | 1919 |
| 32 | [HDB Financial Services Ltd.](https://www.tamtam.ai/c/hdb-financial-services-ltd) (hdbfs.com)<br>Provides diverse financial lending products like personal, business, and vehicle loans, alongside BPO services such as collection call centers and back-office operations for individuals and businesses. | Financial Services | 🇮🇳 Mumbai | 60,142 | 2007 |
| 33 | [EXL](https://www.tamtam.ai/c/exl) (exlservice.com)<br>The company partners with businesses to tailor data-driven solutions, improve efficiency, enhance customer relationships, and drive revenue growth through collaboration and technology | Business Consulting and Services | 🇺🇸 New York | 58,974 | 1999 |
| 34 | [AECOM](https://www.tamtam.ai/c/aecom) (aecom.com)<br>A global infrastructure consulting firm providing professional services in advisory, planning, design, engineering, and construction management for public and private-sector clients | Civil Engineering | 🇺🇸 Dallas | 57,963 |  |
| 35 | [Aramark](https://www.tamtam.ai/c/aramark) (aramark.com)<br>Global hospitality service provider delivering food and facilities management to educational institutions, healthcare providers, sports teams, and municipalities across sixteen countries worldwide. | Hospitality | 🇺🇸 Philadelphia | 56,723 | 1939 |
| 36 | [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 |  |
| 37 | [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 |
| 38 | [Restaurante](https://www.tamtam.ai/c/restaurante) (gonzaloveci.com)<br>A restaurant located in San Pedro Sula, offering food and dining services to customers in the area | Operations Consulting | 🇺🇸 Zurich | 53,004 | 2023 |
| 39 | [Cushman & Wakefield](https://www.tamtam.ai/c/cushman-and-wakefield) (cushmanwakefield.com)<br>Global commercial real estate services provider with 52,000 professionals focused on advancing client, colleague, and community outcomes worldwide. | Real Estate | 🇺🇸 Chicago | 53,000 | 1917 |
| 40 | [Gallagher](https://www.tamtam.ai/c/gallagher) (gallagher.com)<br>Global insurance brokerage offering risk management, consulting, employee benefits, claims management, and retirement services to protect assets and support clients. | Insurance | 🇺🇸 Rolling Meadows | 52,767 |  |
| 41 | [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 |
| 42 | [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 |
| 43 | [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 |  |
| 44 | [Avanade](https://www.tamtam.ai/c/avanade) (avanade.com)<br>Innovative provider of digital, cloud, and advisory services within the Microsoft ecosystem, focused on making a human impact, solving challenges, and promoting sustainability and diversity | IT Services and IT Consulting | 🇺🇸 Seattle | 50,000 | 2000 |
| 45 | [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 |  |
| 46 | [NTT DATA](https://www.tamtam.ai/c/ntt-data) (nttdata.com)<br>Providing IT and business consulting, digital transformation, managed services, and industry solutions to clients worldwide for long-term success. | IT Services and IT Consulting | 🇯🇵 Tokyo | 48,385 |  |
| 47 | [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 |  |
| 48 | [Edward Jones](https://www.tamtam.ai/c/edward-jones-st-louis) (edwardjones.com)<br>Provides personalized financial advisory and investment services through a large network of advisors to help clients achieve financial goals. | Financial Services | 🇺🇸 St. Louis | 45,845 | 1922 |
| 49 | [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 |
| 50 | [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 |  |
| 51 | [C.S](https://www.tamtam.ai/c/csc-1120)<br>The company does amazing things. These amazing things happen daily. They are involved in many amazing projects and activities. | IT Services and IT Consulting | 🇺🇸 Global | 44,000 | 1959 |
| 52 | [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 |  |
| 53 | [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 |
| 54 | [L&T Technology Services](https://www.tamtam.ai/c/l-and-t-technology-services) (ltts.com)<br>Provides engineering and technology services globally, supporting product design, development, and delivery across diverse industries with innovation. | Engineering Services | 🇮🇳 Vadodara | 41,420 |  |
| 55 | [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 |  |
| 56 | [Boston Consulting Group (BCG)](https://www.tamtam.ai/c/boston-consulting-group-bcg) (bcg.com)<br>A global management consulting firm that partners with organizations to tackle challenges, drive growth, and create positive societal impact through innovative solutions | Business Consulting and Services | 🇺🇸 Boston | 40,412 | 1963 |
| 57 | [Marsh McLennan](https://www.tamtam.ai/c/marsh-mclennan) (corporate.marsh.com)<br>Provides risk management, strategic consulting, and human resources solutions to clients worldwide, enhancing their ability to navigate challenges and seize opportunities. | Professional Services | 🇺🇸 New York | 40,340 | 1871 |
| 58 | [Conduent](https://www.tamtam.ai/c/conduent) (conduent.com)<br>Digital business solutions provider leveraging cloud computing, AI, and automation to enhance client operations, improve customer experiences, and drive efficiencies | Business Consulting and Services | 🇺🇸 Florham Park | 38,990 | 2017 |
| 59 | [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 |
| 60 | [Worley](https://www.tamtam.ai/c/worley) (worley.com)<br>Global professional services company specializing in energy, chemicals, and resources, providing integrated solutions for project delivery and asset management | Professional Services | 🇦🇺 Sydney | 37,425 |  |
| 61 | [Booz Allen Hamilton](https://www.tamtam.ai/c/booz-allen-hamilton) (boozallen.com)<br>Innovative technology consulting firm advancing critical missions through AI, cybersecurity, and engineering solutions, empowering clients to shape the future | Software Development | 🇺🇸 McLean | 37,244 | 1914 |
| 62 | [Leidos](https://www.tamtam.ai/c/leidos) (leidos.com)<br>Global technology leader providing digital mission innovations and efficient technical services for government and commercial customers through a diverse, flexible work environment. | Defense and Space Manufacturing | 🇺🇸 Reston | 37,171 | 1969 |
| 63 | [SAIC](https://www.tamtam.ai/c/saic) (bit.ly)<br>Advanced technology mission integrator delivering secure high-end solutions in mission IT, enterprise IT, engineering, and professional services for defense, space, and intelligence. | Defense and Space Manufacturing | 🇺🇸 Reston | 36,645 | 1969 |
| 64 | [Fluor Corporation](https://www.tamtam.ai/c/fluor-corporation) (fluor.com)<br>Global EPC company providing engineering solutions to energy, infrastructure, life sciences, technology, mining, and government sectors with emphasis on innovation and sustainability | Construction | 🇺🇸 Irving | 36,512 | 1912 |
| 65 | [Escritório de Advocacia](https://www.tamtam.ai/c/escritorio-de-advocacia-belem)<br>Legal services provided by a law office specializing in advocacy and legal representation | Law Practice | 🇧🇷 Belém | 35,758 |  |
| 66 | [GlobalLogic](https://www.tamtam.ai/c/globallogic) (globallogic.com)<br>A global product development services leader, combining software engineering expertise and industry experience to help customers design and deliver next-generation products and digital experiences | Software Development | 🇺🇸 Santa Clara | 35,494 |  |
| 67 | [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 |  |
| 68 | [VML](https://www.tamtam.ai/c/vml) (vml.com)<br>Global creative agency combining brand experience, customer experience, and commerce with deep data and technology expertise for clients. | Advertising Services | 🇺🇸 New York | 34,192 |  |
| 69 | [Quess Corp Limited](https://www.tamtam.ai/c/quess-corp-limited) (quesscorp.com)<br>An integrated business service provider offering technology-enabled staffing and managed outsourcing services to create a more productive workforce and drive success for clients | Staffing and Recruiting | 🇮🇳 Bengaluru | 33,670 | 2007 |
| 70 | [Bechtel Corporation](https://www.tamtam.ai/c/bechtel-corporation) (bechtel.com)<br>Engineering, construction, and project management services for energy, infrastructure, manufacturing, mining, and nuclear markets worldwide, delivering successful outcomes. | Construction | 🇺🇸 Reston | 33,626 | 1898 |
| 71 | [Deloitte India (Offices of the US)](https://www.tamtam.ai/c/deloitte-india-offices-of-the-us) (deloitte.com)<br>A region within a global organization providing professional services in India to their US-based parent companies across various sectors | Management Consulting | 🇮🇳 Hyderabad | 33,190 | 1895 |
| 72 | [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 |  |
| 73 | [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 |  |
| 74 | [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 |  |
| 75 | [KBR, Inc.](https://www.tamtam.ai/c/kbr-inc) (kbr.com)<br>Providing science, technology, and engineering solutions to governments and companies worldwide addressing significant contemporary challenges and opportunities. | IT Services and IT Consulting | 🇺🇸 Houston | 31,433 |  |
| 76 | [KPMG India](https://www.tamtam.ai/c/kpmg-india) (social.kpmg)<br>Provides industry-tailored, technology-enabled business advisory services to over 2700 companies across 14 Indian cities, leveraging local professionals and global service delivery. | Business Consulting and Services | 🇮🇳 Gurugram | 31,247 |  |
| 77 | [Manpower](https://www.tamtam.ai/c/manpower) (manpower.com)<br>Global leader in contingent and permanent recruitment, providing agile staffing solutions and access to a deep talent pool for businesses. | Staffing and Recruiting | 🇺🇸 Milwaukee | 30,000 | 1948 |
| 78 | [Colliers](https://www.tamtam.ai/c/colliers) (colliers.com)<br>Offers real estate services, engineering solutions, and investment management, focusing on client success and delivering strong financial returns. | Real Estate | 🇨🇦 Toronto | 29,561 |  |
| 79 | [PwC India](https://www.tamtam.ai/c/pwc-india) (pwc.in)<br>Professional services network providing audit, tax, legal, deals, and consulting to help clients build trust and competitive advantage. | Business Consulting and Services | 🇮🇳 Kolkata | 28,584 |  |
| 80 | [Globant](https://www.tamtam.ai/c/globant) (globant.com)<br>A digitally native company specializing in helping organizations innovate and unleash potential, with a focus on diversity, inclusion, and cybersecurity | IT Services and IT Consulting | 🇺🇸 San Francisco | 28,419 |  |
| 81 | [TEKsystems](https://www.tamtam.ai/c/teksystems) (teksystems.com)<br>Global solutions provider specializing in accelerating business transformation through resolving technology, business, and talent challenges for Fortune 500 organizations | IT Services and IT Consulting | 🇺🇸 Hanover | 28,131 | 1983 |
| 82 | [Tetra Tech](https://www.tamtam.ai/c/tetra-tech) (tetratech.com)<br>A global provider of consulting and engineering services, specializing in innovative technical solutions for water, environment, infrastructure, energy, and international development projects | Civil Engineering | 🇺🇸 Pasadena | 27,460 |  |
| 83 | [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 |  |
| 84 | [Robert Half](https://www.tamtam.ai/c/robert-half) (roberthalf.com)<br>Connecting skilled professionals with companies through contract, temporary, and permanent placements in finance, technology, marketing, legal, and administrative sectors. | Staffing and Recruiting | 🇺🇸 Menlo Park | 26,429 | 1948 |
| 85 | [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 |
| 86 | [Marsh Risk](https://www.tamtam.ai/c/marsh-risk) (marsh.com)<br>A global leader in insurance brokerage and risk advisory, providing data-driven solutions and advisory services to clients worldwide | Insurance | 🇺🇸 New York | 26,000 |  |
| 87 | [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 |
| 88 | [LHH](https://www.tamtam.ai/c/lhh) (lhh.com)<br>Global HR solutions provider offering advisory, career transition, leadership development, and recruitment services to organizations and individuals worldwide. | Human Resources Services | 🇺🇸 Jacksonville | 25,394 |  |
| 89 | [Mercer España](https://www.tamtam.ai/c/mercer-espana) (mercer.com)<br>Mercer is a global consultancy business focused on providing trusted advice and solutions to help organizations build brighter, healthier, and more sustainable futures | Professional Training and Coaching | 🇺🇸 New York | 25,000 | 1945 |
| 90 | [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 |  |
| 91 | [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 |  |
| 92 | [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 |
| 93 | [Wipro Ltd. - India](https://www.tamtam.ai/c/wipro-ltd-india) (wipro.com)<br>A leading provider of IT services leveraging technology solutions to enable business transformation, aligning IT strategies with business goals | IT Services and IT Consulting | 🇮🇳 Bengaluru | 24,515 | 1945 |
| 94 | [Publicis Sapient](https://www.tamtam.ai/c/publicis-sapient) (publicissapient.com)<br>A digital business transformation partner, specializing in strategy, product, experience, engineering, data, and delivering impactful solutions to global organizations | Business Consulting and Services | 🇺🇸 Boston | 24,251 |  |
| 95 | [Bain & Company](https://www.tamtam.ai/c/bain-and-company) (bain.com)<br>Global consultancy aiding ambitious change makers define the future, achieving extraordinary results, outperforming competition, redefining industries, and tackling urgent societal challenges. | Business Consulting and Services | 🇺🇸 Boston | 23,729 |  |
| 96 | [Syneos Health](https://www.tamtam.ai/c/syneos-health) (syneoshealth.com)<br>A leading biopharmaceutical solutions organization driving customer success by translating clinical, medical, and commercial insights into outcomes worldwide Promoting inclusivity and sustainability | Biotechnology Research | 🇺🇸 Morrisville | 23,569 |  |
| 97 | [Unisys](https://www.tamtam.ai/c/unisys) (unisys.com)<br>A global technology solutions company offering digital workplace, cloud, applications & infrastructure, enterprise computing, and business process solutions to empower organizations | IT Services and IT Consulting | 🇺🇸 Blue Bell | 23,358 |  |
| 98 | [Sedgwick](https://www.tamtam.ai/c/sedgwick) (sedgwick.com)<br>A global provider of risk, benefits, and business solutions, offering tailored resources to help organizations with health, claims, brand protection, and business continuity | Insurance | 🇺🇸 | 23,170 | 1969 |
| 99 | [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 |  |
| 100 | [Parexel](https://www.tamtam.ai/c/parexel) (parexel.com)<br>Provides comprehensive clinical development services globally, from early to late phase trials, helping new treatments reach patients faster through expertise and innovation. | Pharmaceutical Manufacturing | 🇺🇸 Raleigh | 21,982 | 1982 |

## 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 12, 2026.

## More company lists in the world

- [The largest companies in the world](https://www.tamtam.ai/l/largest-companies-in-the-world) (415,122)
- [Multinational companies in the world](https://www.tamtam.ai/l/multinational-companies-in-the-world) (74,925)
- [Manufacturers in the world](https://www.tamtam.ai/l/manufacturers-in-the-world) (39,579)
- [Retail chains in the world](https://www.tamtam.ai/l/retail-chains-in-the-world) (35,499)
- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Financial services firms in the world](https://www.tamtam.ai/l/financial-services-firms-in-the-world) (26,817)
- [Education providers in the world](https://www.tamtam.ai/l/education-companies-in-the-world) (23,937)
- [IT Services and IT Consulting companies in the world](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-in-the-world) (23,571)
- [Critical infrastructure operators in the world](https://www.tamtam.ai/l/critical-infrastructure-operators-in-the-world) (23,312)
- [SaaS companies in the world](https://www.tamtam.ai/l/saas-companies-in-the-world) (22,459)
- [IT services companies in the world](https://www.tamtam.ai/l/it-services-companies-in-the-world) (20,934)
- [Software Development companies in the world](https://www.tamtam.ai/l/software-development-companies-in-the-world) (20,534)
- [Hardware manufacturers in the world](https://www.tamtam.ai/l/hardware-companies-in-the-world) (20,159)
- [Financial Services companies in the world](https://www.tamtam.ai/l/financial-services-companies-in-the-world) (19,958)
- [Companies with a mobile app in the world](https://www.tamtam.ai/l/companies-with-mobile-app-in-the-world) (18,922)
- [Public sector organisations in the world](https://www.tamtam.ai/l/public-sector-organisations-in-the-world) (18,493)
- [Healthcare providers in the world](https://www.tamtam.ai/l/healthcare-providers-in-the-world) (16,037)
- [Consulting firms in the world](https://www.tamtam.ai/l/consulting-firms-in-the-world) (16,009)
- [Family-owned companies in the world](https://www.tamtam.ai/l/family-owned-companies-in-the-world) (14,667)
- [Distributors and wholesalers in the world](https://www.tamtam.ai/l/distributors-and-wholesalers-in-the-world) (13,470)
- [Hospitals and Health Care companies in the world](https://www.tamtam.ai/l/hospitals-and-health-care-companies-in-the-world) (12,916)
- [Corporate groups and holding companies in the world](https://www.tamtam.ai/l/holding-companies-in-the-world) (12,864)
- [E-commerce companies in the world](https://www.tamtam.ai/l/ecommerce-companies-in-the-world) (12,013)
- [Higher Education companies in the world](https://www.tamtam.ai/l/higher-education-companies-in-the-world) (11,756)

## The same list elsewhere

- [Professional services firms in Europe](https://www.tamtam.ai/l/professional-services-firms-in-europe) (13,698)
- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,079)
- [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 Asia](https://www.tamtam.ai/l/professional-services-firms-in-asia) (1,619)
- [Professional services firms in India](https://www.tamtam.ai/l/professional-services-firms-india) (1,028)
- [Professional services firms in Latin America](https://www.tamtam.ai/l/professional-services-firms-in-latin-america) (924)
- [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 Brazil](https://www.tamtam.ai/l/professional-services-firms-brazil) (544)
- [Professional services firms in Spain](https://www.tamtam.ai/l/professional-services-firms-spain) (522)
- [Professional services firms in Canada](https://www.tamtam.ai/l/professional-services-firms-canada) (481)
- [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 Australia](https://www.tamtam.ai/l/professional-services-firms-australia) (377)
- [Professional services firms in Africa](https://www.tamtam.ai/l/professional-services-firms-in-africa) (257)
- [Professional services firms in the Middle East](https://www.tamtam.ai/l/professional-services-firms-in-the-middle-east) (253)
- [Professional services firms in Sweden](https://www.tamtam.ai/l/professional-services-firms-sweden) (194)
- [Professional services firms in China](https://www.tamtam.ai/l/professional-services-firms-china) (162)
- [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)

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